Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

33 files changed, 6183 insertions, 0 deletions

diff --git a/include/linux/sunrpc/addr.h b/include/linux/sunrpc/addr.h
new file mode 100644
index 000000000..07d454873
--- /dev/null
+++ b/include/linux/sunrpc/addr.h
@@ -0,0 +1,184 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/addr.h
+ *
+ * Various routines for copying and comparing sockaddrs and for
+ * converting them to and from presentation format.
+ */
+#ifndef _LINUX_SUNRPC_ADDR_H
+#define _LINUX_SUNRPC_ADDR_H
+
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <net/ipv6.h>
+
+size_t		rpc_ntop(const struct sockaddr *, char *, const size_t);
+size_t		rpc_pton(struct net *, const char *, const size_t,
+			 struct sockaddr *, const size_t);
+char *		rpc_sockaddr2uaddr(const struct sockaddr *, gfp_t);
+size_t		rpc_uaddr2sockaddr(struct net *, const char *, const size_t,
+				   struct sockaddr *, const size_t);
+
+static inline unsigned short rpc_get_port(const struct sockaddr *sap)
+{
+	switch (sap->sa_family) {
+	case AF_INET:
+		return ntohs(((struct sockaddr_in *)sap)->sin_port);
+	case AF_INET6:
+		return ntohs(((struct sockaddr_in6 *)sap)->sin6_port);
+	}
+	return 0;
+}
+
+static inline void rpc_set_port(struct sockaddr *sap,
+				const unsigned short port)
+{
+	switch (sap->sa_family) {
+	case AF_INET:
+		((struct sockaddr_in *)sap)->sin_port = htons(port);
+		break;
+	case AF_INET6:
+		((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
+		break;
+	}
+}
+
+#define IPV6_SCOPE_DELIMITER		'%'
+#define IPV6_SCOPE_ID_LEN		sizeof("%nnnnnnnnnn")
+
+static inline bool rpc_cmp_addr4(const struct sockaddr *sap1,
+				 const struct sockaddr *sap2)
+{
+	const struct sockaddr_in *sin1 = (const struct sockaddr_in *)sap1;
+	const struct sockaddr_in *sin2 = (const struct sockaddr_in *)sap2;
+
+	return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
+}
+
+static inline bool __rpc_copy_addr4(struct sockaddr *dst,
+				    const struct sockaddr *src)
+{
+	const struct sockaddr_in *ssin = (struct sockaddr_in *) src;
+	struct sockaddr_in *dsin = (struct sockaddr_in *) dst;
+
+	dsin->sin_family = ssin->sin_family;
+	dsin->sin_addr.s_addr = ssin->sin_addr.s_addr;
+	return true;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
+				 const struct sockaddr *sap2)
+{
+	const struct sockaddr_in6 *sin1 = (const struct sockaddr_in6 *)sap1;
+	const struct sockaddr_in6 *sin2 = (const struct sockaddr_in6 *)sap2;
+
+	if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
+		return false;
+	else if (ipv6_addr_type(&sin1->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+		return sin1->sin6_scope_id == sin2->sin6_scope_id;
+
+	return true;
+}
+
+static inline bool __rpc_copy_addr6(struct sockaddr *dst,
+				    const struct sockaddr *src)
+{
+	const struct sockaddr_in6 *ssin6 = (const struct sockaddr_in6 *) src;
+	struct sockaddr_in6 *dsin6 = (struct sockaddr_in6 *) dst;
+
+	dsin6->sin6_family = ssin6->sin6_family;
+	dsin6->sin6_addr = ssin6->sin6_addr;
+	dsin6->sin6_scope_id = ssin6->sin6_scope_id;
+	return true;
+}
+#else	/* !(IS_ENABLED(CONFIG_IPV6) */
+static inline bool rpc_cmp_addr6(const struct sockaddr *sap1,
+				   const struct sockaddr *sap2)
+{
+	return false;
+}
+
+static inline bool __rpc_copy_addr6(struct sockaddr *dst,
+				    const struct sockaddr *src)
+{
+	return false;
+}
+#endif	/* !(IS_ENABLED(CONFIG_IPV6) */
+
+/**
+ * rpc_cmp_addr - compare the address portion of two sockaddrs.
+ * @sap1: first sockaddr
+ * @sap2: second sockaddr
+ *
+ * Just compares the family and address portion. Ignores port, but
+ * compares the scope if it's a link-local address.
+ *
+ * Returns true if the addrs are equal, false if they aren't.
+ */
+static inline bool rpc_cmp_addr(const struct sockaddr *sap1,
+				const struct sockaddr *sap2)
+{
+	if (sap1->sa_family == sap2->sa_family) {
+		switch (sap1->sa_family) {
+		case AF_INET:
+			return rpc_cmp_addr4(sap1, sap2);
+		case AF_INET6:
+			return rpc_cmp_addr6(sap1, sap2);
+		}
+	}
+	return false;
+}
+
+/**
+ * rpc_cmp_addr_port - compare the address and port number of two sockaddrs.
+ * @sap1: first sockaddr
+ * @sap2: second sockaddr
+ */
+static inline bool rpc_cmp_addr_port(const struct sockaddr *sap1,
+				     const struct sockaddr *sap2)
+{
+	if (!rpc_cmp_addr(sap1, sap2))
+		return false;
+	return rpc_get_port(sap1) == rpc_get_port(sap2);
+}
+
+/**
+ * rpc_copy_addr - copy the address portion of one sockaddr to another
+ * @dst: destination sockaddr
+ * @src: source sockaddr
+ *
+ * Just copies the address portion and family. Ignores port, scope, etc.
+ * Caller is responsible for making certain that dst is large enough to hold
+ * the address in src. Returns true if address family is supported. Returns
+ * false otherwise.
+ */
+static inline bool rpc_copy_addr(struct sockaddr *dst,
+				 const struct sockaddr *src)
+{
+	switch (src->sa_family) {
+	case AF_INET:
+		return __rpc_copy_addr4(dst, src);
+	case AF_INET6:
+		return __rpc_copy_addr6(dst, src);
+	}
+	return false;
+}
+
+/**
+ * rpc_get_scope_id - return scopeid for a given sockaddr
+ * @sa: sockaddr to get scopeid from
+ *
+ * Returns the value of the sin6_scope_id for AF_INET6 addrs, or 0 if
+ * not an AF_INET6 address.
+ */
+static inline u32 rpc_get_scope_id(const struct sockaddr *sa)
+{
+	if (sa->sa_family != AF_INET6)
+		return 0;
+
+	return ((struct sockaddr_in6 *) sa)->sin6_scope_id;
+}
+
+#endif /* _LINUX_SUNRPC_ADDR_H */
diff --git a/include/linux/sunrpc/auth.h b/include/linux/sunrpc/auth.h
new file mode 100644
index 000000000..3e6ce288a
--- /dev/null
+++ b/include/linux/sunrpc/auth.h
@@ -0,0 +1,195 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/auth.h
+ *
+ * Declarations for the RPC client authentication machinery.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_AUTH_H
+#define _LINUX_SUNRPC_AUTH_H
+
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/xdr.h>
+
+#include <linux/atomic.h>
+#include <linux/rcupdate.h>
+#include <linux/uidgid.h>
+#include <linux/utsname.h>
+
+/*
+ * Maximum size of AUTH_NONE authentication information, in XDR words.
+ */
+#define NUL_CALLSLACK	(4)
+#define NUL_REPLYSLACK	(2)
+
+/*
+ * Size of the nodename buffer. RFC1831 specifies a hard limit of 255 bytes,
+ * but Linux hostnames are actually limited to __NEW_UTS_LEN bytes.
+ */
+#define UNX_MAXNODENAME	__NEW_UTS_LEN
+#define UNX_CALLSLACK	(21 + XDR_QUADLEN(UNX_MAXNODENAME))
+#define UNX_NGROUPS	16
+
+struct rpcsec_gss_info;
+
+struct auth_cred {
+	const struct cred *cred;
+	const char *principal;	/* If present, this is a machine credential */
+};
+
+/*
+ * Client user credentials
+ */
+struct rpc_auth;
+struct rpc_credops;
+struct rpc_cred {
+	struct hlist_node	cr_hash;	/* hash chain */
+	struct list_head	cr_lru;		/* lru garbage collection */
+	struct rcu_head		cr_rcu;
+	struct rpc_auth *	cr_auth;
+	const struct rpc_credops *cr_ops;
+	unsigned long		cr_expire;	/* when to gc */
+	unsigned long		cr_flags;	/* various flags */
+	refcount_t		cr_count;	/* ref count */
+	const struct cred	*cr_cred;
+
+	/* per-flavor data */
+};
+#define RPCAUTH_CRED_NEW	0
+#define RPCAUTH_CRED_UPTODATE	1
+#define RPCAUTH_CRED_HASHED	2
+#define RPCAUTH_CRED_NEGATIVE	3
+
+const struct cred *rpc_machine_cred(void);
+
+/*
+ * Client authentication handle
+ */
+struct rpc_cred_cache;
+struct rpc_authops;
+struct rpc_auth {
+	unsigned int		au_cslack;	/* call cred size estimate */
+	unsigned int		au_rslack;	/* reply cred size estimate */
+	unsigned int		au_verfsize;	/* size of reply verifier */
+	unsigned int		au_ralign;	/* words before UL header */
+
+	unsigned long		au_flags;
+	const struct rpc_authops *au_ops;
+	rpc_authflavor_t	au_flavor;	/* pseudoflavor (note may
+						 * differ from the flavor in
+						 * au_ops->au_flavor in gss
+						 * case) */
+	refcount_t		au_count;	/* Reference counter */
+
+	struct rpc_cred_cache *	au_credcache;
+	/* per-flavor data */
+};
+
+/* rpc_auth au_flags */
+#define RPCAUTH_AUTH_DATATOUCH		(1)
+#define RPCAUTH_AUTH_UPDATE_SLACK	(2)
+
+struct rpc_auth_create_args {
+	rpc_authflavor_t pseudoflavor;
+	const char *target_name;
+};
+
+/* Flags for rpcauth_lookupcred() */
+#define RPCAUTH_LOOKUP_NEW		0x01	/* Accept an uninitialised cred */
+#define RPCAUTH_LOOKUP_ASYNC		0x02	/* Don't block waiting for memory */
+
+/*
+ * Client authentication ops
+ */
+struct rpc_authops {
+	struct module		*owner;
+	rpc_authflavor_t	au_flavor;	/* flavor (RPC_AUTH_*) */
+	char *			au_name;
+	struct rpc_auth *	(*create)(const struct rpc_auth_create_args *,
+					  struct rpc_clnt *);
+	void			(*destroy)(struct rpc_auth *);
+
+	int			(*hash_cred)(struct auth_cred *, unsigned int);
+	struct rpc_cred *	(*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
+	struct rpc_cred *	(*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
+	rpc_authflavor_t	(*info2flavor)(struct rpcsec_gss_info *);
+	int			(*flavor2info)(rpc_authflavor_t,
+						struct rpcsec_gss_info *);
+	int			(*key_timeout)(struct rpc_auth *,
+						struct rpc_cred *);
+};
+
+struct rpc_credops {
+	const char *		cr_name;	/* Name of the auth flavour */
+	int			(*cr_init)(struct rpc_auth *, struct rpc_cred *);
+	void			(*crdestroy)(struct rpc_cred *);
+
+	int			(*crmatch)(struct auth_cred *, struct rpc_cred *, int);
+	int			(*crmarshal)(struct rpc_task *task,
+					     struct xdr_stream *xdr);
+	int			(*crrefresh)(struct rpc_task *);
+	int			(*crvalidate)(struct rpc_task *task,
+					      struct xdr_stream *xdr);
+	int			(*crwrap_req)(struct rpc_task *task,
+					      struct xdr_stream *xdr);
+	int			(*crunwrap_resp)(struct rpc_task *task,
+						 struct xdr_stream *xdr);
+	int			(*crkey_timeout)(struct rpc_cred *);
+	char *			(*crstringify_acceptor)(struct rpc_cred *);
+	bool			(*crneed_reencode)(struct rpc_task *);
+};
+
+extern const struct rpc_authops	authunix_ops;
+extern const struct rpc_authops	authnull_ops;
+
+int __init		rpc_init_authunix(void);
+int __init		rpcauth_init_module(void);
+void			rpcauth_remove_module(void);
+void 			rpc_destroy_authunix(void);
+
+int			rpcauth_register(const struct rpc_authops *);
+int			rpcauth_unregister(const struct rpc_authops *);
+struct rpc_auth *	rpcauth_create(const struct rpc_auth_create_args *,
+				struct rpc_clnt *);
+void			rpcauth_release(struct rpc_auth *);
+rpc_authflavor_t	rpcauth_get_pseudoflavor(rpc_authflavor_t,
+				struct rpcsec_gss_info *);
+int			rpcauth_get_gssinfo(rpc_authflavor_t,
+				struct rpcsec_gss_info *);
+struct rpc_cred *	rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
+void			rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
+struct rpc_cred *	rpcauth_lookupcred(struct rpc_auth *, int);
+void			put_rpccred(struct rpc_cred *);
+int			rpcauth_marshcred(struct rpc_task *task,
+					  struct xdr_stream *xdr);
+int			rpcauth_checkverf(struct rpc_task *task,
+					  struct xdr_stream *xdr);
+int			rpcauth_wrap_req_encode(struct rpc_task *task,
+						struct xdr_stream *xdr);
+int			rpcauth_wrap_req(struct rpc_task *task,
+					 struct xdr_stream *xdr);
+int			rpcauth_unwrap_resp_decode(struct rpc_task *task,
+						   struct xdr_stream *xdr);
+int			rpcauth_unwrap_resp(struct rpc_task *task,
+					    struct xdr_stream *xdr);
+bool			rpcauth_xmit_need_reencode(struct rpc_task *task);
+int			rpcauth_refreshcred(struct rpc_task *);
+void			rpcauth_invalcred(struct rpc_task *);
+int			rpcauth_uptodatecred(struct rpc_task *);
+int			rpcauth_init_credcache(struct rpc_auth *);
+void			rpcauth_destroy_credcache(struct rpc_auth *);
+void			rpcauth_clear_credcache(struct rpc_cred_cache *);
+char *			rpcauth_stringify_acceptor(struct rpc_cred *);
+
+static inline
+struct rpc_cred *get_rpccred(struct rpc_cred *cred)
+{
+	if (cred != NULL && refcount_inc_not_zero(&cred->cr_count))
+		return cred;
+	return NULL;
+}
+
+#endif /* _LINUX_SUNRPC_AUTH_H */
diff --git a/include/linux/sunrpc/auth_gss.h b/include/linux/sunrpc/auth_gss.h
new file mode 100644
index 000000000..43e481aa3
--- /dev/null
+++ b/include/linux/sunrpc/auth_gss.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/auth_gss.h
+ *
+ * Declarations for RPCSEC_GSS
+ *
+ * Dug Song <dugsong@monkey.org>
+ * Andy Adamson <andros@umich.edu>
+ * Bruce Fields <bfields@umich.edu>
+ * Copyright (c) 2000 The Regents of the University of Michigan
+ */
+
+#ifndef _LINUX_SUNRPC_AUTH_GSS_H
+#define _LINUX_SUNRPC_AUTH_GSS_H
+
+#include <linux/refcount.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/gss_api.h>
+
+#define RPC_GSS_VERSION		1
+
+#define MAXSEQ 0x80000000 /* maximum legal sequence number, from rfc 2203 */
+
+enum rpc_gss_proc {
+	RPC_GSS_PROC_DATA = 0,
+	RPC_GSS_PROC_INIT = 1,
+	RPC_GSS_PROC_CONTINUE_INIT = 2,
+	RPC_GSS_PROC_DESTROY = 3
+};
+
+enum rpc_gss_svc {
+	RPC_GSS_SVC_NONE = 1,
+	RPC_GSS_SVC_INTEGRITY = 2,
+	RPC_GSS_SVC_PRIVACY = 3
+};
+
+/* on-the-wire gss cred: */
+struct rpc_gss_wire_cred {
+	u32			gc_v;		/* version */
+	u32			gc_proc;	/* control procedure */
+	u32			gc_seq;		/* sequence number */
+	u32			gc_svc;		/* service */
+	struct xdr_netobj	gc_ctx;		/* context handle */
+};
+
+/* on-the-wire gss verifier: */
+struct rpc_gss_wire_verf {
+	u32			gv_flavor;
+	struct xdr_netobj	gv_verf;
+};
+
+/* return from gss NULL PROC init sec context */
+struct rpc_gss_init_res {
+	struct xdr_netobj	gr_ctx;		/* context handle */
+	u32			gr_major;	/* major status */
+	u32			gr_minor;	/* minor status */
+	u32			gr_win;		/* sequence window */
+	struct xdr_netobj	gr_token;	/* token */
+};
+
+/* The gss_cl_ctx struct holds all the information the rpcsec_gss client
+ * code needs to know about a single security context.  In particular,
+ * gc_gss_ctx is the context handle that is used to do gss-api calls, while
+ * gc_wire_ctx is the context handle that is used to identify the context on
+ * the wire when communicating with a server. */
+
+struct gss_cl_ctx {
+	refcount_t		count;
+	enum rpc_gss_proc	gc_proc;
+	u32			gc_seq;
+	u32			gc_seq_xmit;
+	spinlock_t		gc_seq_lock;
+	struct gss_ctx		*gc_gss_ctx;
+	struct xdr_netobj	gc_wire_ctx;
+	struct xdr_netobj	gc_acceptor;
+	u32			gc_win;
+	unsigned long		gc_expiry;
+	struct rcu_head		gc_rcu;
+};
+
+struct gss_upcall_msg;
+struct gss_cred {
+	struct rpc_cred		gc_base;
+	enum rpc_gss_svc	gc_service;
+	struct gss_cl_ctx __rcu	*gc_ctx;
+	struct gss_upcall_msg	*gc_upcall;
+	const char		*gc_principal;
+	unsigned long		gc_upcall_timestamp;
+};
+
+#endif /* _LINUX_SUNRPC_AUTH_GSS_H */
+
diff --git a/include/linux/sunrpc/bc_xprt.h b/include/linux/sunrpc/bc_xprt.h
new file mode 100644
index 000000000..db30a159f
--- /dev/null
+++ b/include/linux/sunrpc/bc_xprt.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/******************************************************************************
+
+(c) 2008 NetApp.  All Rights Reserved.
+
+
+******************************************************************************/
+
+/*
+ * Functions to create and manage the backchannel
+ */
+
+#ifndef _LINUX_SUNRPC_BC_XPRT_H
+#define _LINUX_SUNRPC_BC_XPRT_H
+
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/sunrpc/sched.h>
+
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
+void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
+void xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task);
+void xprt_free_bc_request(struct rpc_rqst *req);
+int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
+void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
+
+/* Socket backchannel transport methods */
+int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs);
+void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs);
+void xprt_free_bc_rqst(struct rpc_rqst *req);
+unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt);
+
+/*
+ * Determine if a shared backchannel is in use
+ */
+static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
+{
+	return rqstp->rq_server->sv_bc_enabled;
+}
+
+static inline void set_bc_enabled(struct svc_serv *serv)
+{
+	serv->sv_bc_enabled = true;
+}
+#else /* CONFIG_SUNRPC_BACKCHANNEL */
+static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
+					 unsigned int min_reqs)
+{
+	return 0;
+}
+
+static inline void xprt_destroy_backchannel(struct rpc_xprt *xprt,
+					    unsigned int max_reqs)
+{
+}
+
+static inline bool svc_is_backchannel(const struct svc_rqst *rqstp)
+{
+	return false;
+}
+
+static inline void set_bc_enabled(struct svc_serv *serv)
+{
+}
+
+static inline void xprt_free_bc_request(struct rpc_rqst *req)
+{
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+#endif /* _LINUX_SUNRPC_BC_XPRT_H */
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
new file mode 100644
index 000000000..ec5a555df
--- /dev/null
+++ b/include/linux/sunrpc/cache.h
@@ -0,0 +1,316 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * include/linux/sunrpc/cache.h
+ *
+ * Generic code for various authentication-related caches
+ * used by sunrpc clients and servers.
+ *
+ * Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
+ */
+
+#ifndef _LINUX_SUNRPC_CACHE_H_
+#define _LINUX_SUNRPC_CACHE_H_
+
+#include <linux/kref.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <linux/kstrtox.h>
+#include <linux/proc_fs.h>
+
+/*
+ * Each cache requires:
+ *  - A 'struct cache_detail' which contains information specific to the cache
+ *    for common code to use.
+ *  - An item structure that must contain a "struct cache_head"
+ *  - A lookup function defined using DefineCacheLookup
+ *  - A 'put' function that can release a cache item. It will only
+ *    be called after cache_put has succeed, so there are guarantee
+ *    to be no references.
+ *  - A function to calculate a hash of an item's key.
+ *
+ * as well as assorted code fragments (e.g. compare keys) and numbers
+ * (e.g. hash size, goal_age, etc).
+ *
+ * Each cache must be registered so that it can be cleaned regularly.
+ * When the cache is unregistered, it is flushed completely.
+ *
+ * Entries have a ref count and a 'hashed' flag which counts the existence
+ * in the hash table.
+ * We only expire entries when refcount is zero.
+ * Existence in the cache is counted  the refcount.
+ */
+
+/* Every cache item has a common header that is used
+ * for expiring and refreshing entries.
+ * 
+ */
+struct cache_head {
+	struct hlist_node	cache_list;
+	time64_t	expiry_time;	/* After time expiry_time, don't use
+					 * the data */
+	time64_t	last_refresh;   /* If CACHE_PENDING, this is when upcall was
+					 * sent, else this is when update was
+					 * received, though it is alway set to
+					 * be *after* ->flush_time.
+					 */
+	struct kref	ref;
+	unsigned long	flags;
+};
+#define	CACHE_VALID	0	/* Entry contains valid data */
+#define	CACHE_NEGATIVE	1	/* Negative entry - there is no match for the key */
+#define	CACHE_PENDING	2	/* An upcall has been sent but no reply received yet*/
+#define	CACHE_CLEANED	3	/* Entry has been cleaned from cache */
+
+#define	CACHE_NEW_EXPIRY 120	/* keep new things pending confirmation for 120 seconds */
+
+struct cache_detail {
+	struct module *		owner;
+	int			hash_size;
+	struct hlist_head *	hash_table;
+	spinlock_t		hash_lock;
+
+	char			*name;
+	void			(*cache_put)(struct kref *);
+
+	int			(*cache_upcall)(struct cache_detail *,
+						struct cache_head *);
+
+	void			(*cache_request)(struct cache_detail *cd,
+						 struct cache_head *ch,
+						 char **bpp, int *blen);
+
+	int			(*cache_parse)(struct cache_detail *,
+					       char *buf, int len);
+
+	int			(*cache_show)(struct seq_file *m,
+					      struct cache_detail *cd,
+					      struct cache_head *h);
+	void			(*warn_no_listener)(struct cache_detail *cd,
+					      int has_died);
+
+	struct cache_head *	(*alloc)(void);
+	void			(*flush)(void);
+	int			(*match)(struct cache_head *orig, struct cache_head *new);
+	void			(*init)(struct cache_head *orig, struct cache_head *new);
+	void			(*update)(struct cache_head *orig, struct cache_head *new);
+
+	/* fields below this comment are for internal use
+	 * and should not be touched by cache owners
+	 */
+	time64_t		flush_time;		/* flush all cache items with
+							 * last_refresh at or earlier
+							 * than this.  last_refresh
+							 * is never set at or earlier
+							 * than this.
+							 */
+	struct list_head	others;
+	time64_t		nextcheck;
+	int			entries;
+
+	/* fields for communication over channel */
+	struct list_head	queue;
+
+	atomic_t		writers;		/* how many time is /channel open */
+	time64_t		last_close;		/* if no writers, when did last close */
+	time64_t		last_warn;		/* when we last warned about no writers */
+
+	union {
+		struct proc_dir_entry	*procfs;
+		struct dentry		*pipefs;
+	};
+	struct net		*net;
+};
+
+/* this must be embedded in any request structure that
+ * identifies an object that will want a callback on
+ * a cache fill
+ */
+struct cache_req {
+	struct cache_deferred_req *(*defer)(struct cache_req *req);
+	unsigned long	thread_wait;	/* How long (jiffies) we can block the
+					 * current thread to wait for updates.
+					 */
+};
+
+/* this must be embedded in a deferred_request that is being
+ * delayed awaiting cache-fill
+ */
+struct cache_deferred_req {
+	struct hlist_node	hash;	/* on hash chain */
+	struct list_head	recent; /* on fifo */
+	struct cache_head	*item;  /* cache item we wait on */
+	void			*owner; /* we might need to discard all defered requests
+					 * owned by someone */
+	void			(*revisit)(struct cache_deferred_req *req,
+					   int too_many);
+};
+
+/*
+ * timestamps kept in the cache are expressed in seconds
+ * since boot.  This is the best for measuring differences in
+ * real time.
+ * This reimplemnts ktime_get_boottime_seconds() in a slightly
+ * faster but less accurate way. When we end up converting
+ * back to wallclock (CLOCK_REALTIME), that error often
+ * cancels out during the reverse operation.
+ */
+static inline time64_t seconds_since_boot(void)
+{
+	struct timespec64 boot;
+	getboottime64(&boot);
+	return ktime_get_real_seconds() - boot.tv_sec;
+}
+
+static inline time64_t convert_to_wallclock(time64_t sinceboot)
+{
+	struct timespec64 boot;
+	getboottime64(&boot);
+	return boot.tv_sec + sinceboot;
+}
+
+extern const struct file_operations cache_file_operations_pipefs;
+extern const struct file_operations content_file_operations_pipefs;
+extern const struct file_operations cache_flush_operations_pipefs;
+
+extern struct cache_head *
+sunrpc_cache_lookup_rcu(struct cache_detail *detail,
+			struct cache_head *key, int hash);
+extern struct cache_head *
+sunrpc_cache_update(struct cache_detail *detail,
+		    struct cache_head *new, struct cache_head *old, int hash);
+
+extern int
+sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h);
+extern int
+sunrpc_cache_pipe_upcall_timeout(struct cache_detail *detail,
+				 struct cache_head *h);
+
+
+extern void cache_clean_deferred(void *owner);
+
+static inline struct cache_head  *cache_get(struct cache_head *h)
+{
+	kref_get(&h->ref);
+	return h;
+}
+
+static inline struct cache_head  *cache_get_rcu(struct cache_head *h)
+{
+	if (kref_get_unless_zero(&h->ref))
+		return h;
+	return NULL;
+}
+
+static inline void cache_put(struct cache_head *h, struct cache_detail *cd)
+{
+	if (kref_read(&h->ref) <= 2 &&
+	    h->expiry_time < cd->nextcheck)
+		cd->nextcheck = h->expiry_time;
+	kref_put(&h->ref, cd->cache_put);
+}
+
+static inline bool cache_is_expired(struct cache_detail *detail, struct cache_head *h)
+{
+	if (h->expiry_time < seconds_since_boot())
+		return true;
+	if (!test_bit(CACHE_VALID, &h->flags))
+		return false;
+	return detail->flush_time >= h->last_refresh;
+}
+
+extern int cache_check(struct cache_detail *detail,
+		       struct cache_head *h, struct cache_req *rqstp);
+extern void cache_flush(void);
+extern void cache_purge(struct cache_detail *detail);
+#define NEVER (0x7FFFFFFF)
+extern void __init cache_initialize(void);
+extern int cache_register_net(struct cache_detail *cd, struct net *net);
+extern void cache_unregister_net(struct cache_detail *cd, struct net *net);
+
+extern struct cache_detail *cache_create_net(const struct cache_detail *tmpl, struct net *net);
+extern void cache_destroy_net(struct cache_detail *cd, struct net *net);
+
+extern void sunrpc_init_cache_detail(struct cache_detail *cd);
+extern void sunrpc_destroy_cache_detail(struct cache_detail *cd);
+extern int sunrpc_cache_register_pipefs(struct dentry *parent, const char *,
+					umode_t, struct cache_detail *);
+extern void sunrpc_cache_unregister_pipefs(struct cache_detail *);
+extern void sunrpc_cache_unhash(struct cache_detail *, struct cache_head *);
+
+/* Must store cache_detail in seq_file->private if using next three functions */
+extern void *cache_seq_start_rcu(struct seq_file *file, loff_t *pos);
+extern void *cache_seq_next_rcu(struct seq_file *file, void *p, loff_t *pos);
+extern void cache_seq_stop_rcu(struct seq_file *file, void *p);
+
+extern void qword_add(char **bpp, int *lp, char *str);
+extern void qword_addhex(char **bpp, int *lp, char *buf, int blen);
+extern int qword_get(char **bpp, char *dest, int bufsize);
+
+static inline int get_int(char **bpp, int *anint)
+{
+	char buf[50];
+	char *ep;
+	int rv;
+	int len = qword_get(bpp, buf, sizeof(buf));
+
+	if (len < 0)
+		return -EINVAL;
+	if (len == 0)
+		return -ENOENT;
+
+	rv = simple_strtol(buf, &ep, 0);
+	if (*ep)
+		return -EINVAL;
+
+	*anint = rv;
+	return 0;
+}
+
+static inline int get_uint(char **bpp, unsigned int *anint)
+{
+	char buf[50];
+	int len = qword_get(bpp, buf, sizeof(buf));
+
+	if (len < 0)
+		return -EINVAL;
+	if (len == 0)
+		return -ENOENT;
+
+	if (kstrtouint(buf, 0, anint))
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int get_time(char **bpp, time64_t *time)
+{
+	char buf[50];
+	long long ll;
+	int len = qword_get(bpp, buf, sizeof(buf));
+
+	if (len < 0)
+		return -EINVAL;
+	if (len == 0)
+		return -ENOENT;
+
+	if (kstrtoll(buf, 0, &ll))
+		return -EINVAL;
+
+	*time = ll;
+	return 0;
+}
+
+static inline time64_t get_expiry(char **bpp)
+{
+	time64_t rv;
+	struct timespec64 boot;
+
+	if (get_time(bpp, &rv))
+		return 0;
+	if (rv < 0)
+		return 0;
+	getboottime64(&boot);
+	return rv - boot.tv_sec;
+}
+
+#endif /*  _LINUX_SUNRPC_CACHE_H_ */
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
new file mode 100644
index 000000000..c794b0ce4
--- /dev/null
+++ b/include/linux/sunrpc/clnt.h
@@ -0,0 +1,264 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/include/linux/sunrpc/clnt.h
+ *
+ *  Declarations for the high-level RPC client interface
+ *
+ *  Copyright (C) 1995, 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_CLNT_H
+#define _LINUX_SUNRPC_CLNT_H
+
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/refcount.h>
+
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xprt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/timer.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <asm/signal.h>
+#include <linux/path.h>
+#include <net/ipv6.h>
+#include <linux/sunrpc/xprtmultipath.h>
+
+struct rpc_inode;
+struct rpc_sysfs_client;
+
+/*
+ * The high-level client handle
+ */
+struct rpc_clnt {
+	refcount_t		cl_count;	/* Number of references */
+	unsigned int		cl_clid;	/* client id */
+	struct list_head	cl_clients;	/* Global list of clients */
+	struct list_head	cl_tasks;	/* List of tasks */
+	atomic_t		cl_pid;		/* task PID counter */
+	spinlock_t		cl_lock;	/* spinlock */
+	struct rpc_xprt __rcu *	cl_xprt;	/* transport */
+	const struct rpc_procinfo *cl_procinfo;	/* procedure info */
+	u32			cl_prog,	/* RPC program number */
+				cl_vers,	/* RPC version number */
+				cl_maxproc;	/* max procedure number */
+
+	struct rpc_auth *	cl_auth;	/* authenticator */
+	struct rpc_stat *	cl_stats;	/* per-program statistics */
+	struct rpc_iostats *	cl_metrics;	/* per-client statistics */
+
+	unsigned int		cl_softrtry : 1,/* soft timeouts */
+				cl_softerr  : 1,/* Timeouts return errors */
+				cl_discrtry : 1,/* disconnect before retry */
+				cl_noretranstimeo: 1,/* No retransmit timeouts */
+				cl_autobind : 1,/* use getport() */
+				cl_chatty   : 1;/* be verbose */
+
+	struct rpc_rtt *	cl_rtt;		/* RTO estimator data */
+	const struct rpc_timeout *cl_timeout;	/* Timeout strategy */
+
+	atomic_t		cl_swapper;	/* swapfile count */
+	int			cl_nodelen;	/* nodename length */
+	char 			cl_nodename[UNX_MAXNODENAME+1];
+	struct rpc_pipe_dir_head cl_pipedir_objects;
+	struct rpc_clnt *	cl_parent;	/* Points to parent of clones */
+	struct rpc_rtt		cl_rtt_default;
+	struct rpc_timeout	cl_timeout_default;
+	const struct rpc_program *cl_program;
+	const char *		cl_principal;	/* use for machine cred */
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	struct dentry		*cl_debugfs;	/* debugfs directory */
+#endif
+	struct rpc_sysfs_client *cl_sysfs;	/* sysfs directory */
+	/* cl_work is only needed after cl_xpi is no longer used,
+	 * and that are of similar size
+	 */
+	union {
+		struct rpc_xprt_iter	cl_xpi;
+		struct work_struct	cl_work;
+	};
+	const struct cred	*cl_cred;
+	unsigned int		cl_max_connect; /* max number of transports not to the same IP */
+	struct super_block *pipefs_sb;
+};
+
+/*
+ * General RPC program info
+ */
+#define RPC_MAXVERSION		4
+struct rpc_program {
+	const char *		name;		/* protocol name */
+	u32			number;		/* program number */
+	unsigned int		nrvers;		/* number of versions */
+	const struct rpc_version **	version;	/* version array */
+	struct rpc_stat *	stats;		/* statistics */
+	const char *		pipe_dir_name;	/* path to rpc_pipefs dir */
+};
+
+struct rpc_version {
+	u32			number;		/* version number */
+	unsigned int		nrprocs;	/* number of procs */
+	const struct rpc_procinfo *procs;	/* procedure array */
+	unsigned int		*counts;	/* call counts */
+};
+
+/*
+ * Procedure information
+ */
+struct rpc_procinfo {
+	u32			p_proc;		/* RPC procedure number */
+	kxdreproc_t		p_encode;	/* XDR encode function */
+	kxdrdproc_t		p_decode;	/* XDR decode function */
+	unsigned int		p_arglen;	/* argument hdr length (u32) */
+	unsigned int		p_replen;	/* reply hdr length (u32) */
+	unsigned int		p_timer;	/* Which RTT timer to use */
+	u32			p_statidx;	/* Which procedure to account */
+	const char *		p_name;		/* name of procedure */
+};
+
+struct rpc_create_args {
+	struct net		*net;
+	int			protocol;
+	struct sockaddr		*address;
+	size_t			addrsize;
+	struct sockaddr		*saddress;
+	const struct rpc_timeout *timeout;
+	const char		*servername;
+	const char		*nodename;
+	const struct rpc_program *program;
+	u32			prognumber;	/* overrides program->number */
+	u32			version;
+	rpc_authflavor_t	authflavor;
+	u32			nconnect;
+	unsigned long		flags;
+	char			*client_name;
+	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
+	const struct cred	*cred;
+	unsigned int		max_connect;
+};
+
+struct rpc_add_xprt_test {
+	void (*add_xprt_test)(struct rpc_clnt *clnt,
+		struct rpc_xprt *xprt,
+		void *calldata);
+	void *data;
+};
+
+/* Values for "flags" field */
+#define RPC_CLNT_CREATE_HARDRTRY	(1UL << 0)
+#define RPC_CLNT_CREATE_AUTOBIND	(1UL << 2)
+#define RPC_CLNT_CREATE_NONPRIVPORT	(1UL << 3)
+#define RPC_CLNT_CREATE_NOPING		(1UL << 4)
+#define RPC_CLNT_CREATE_DISCRTRY	(1UL << 5)
+#define RPC_CLNT_CREATE_QUIET		(1UL << 6)
+#define RPC_CLNT_CREATE_INFINITE_SLOTS	(1UL << 7)
+#define RPC_CLNT_CREATE_NO_IDLE_TIMEOUT	(1UL << 8)
+#define RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT	(1UL << 9)
+#define RPC_CLNT_CREATE_SOFTERR		(1UL << 10)
+#define RPC_CLNT_CREATE_REUSEPORT	(1UL << 11)
+#define RPC_CLNT_CREATE_CONNECTED	(1UL << 12)
+
+struct rpc_clnt *rpc_create(struct rpc_create_args *args);
+struct rpc_clnt	*rpc_bind_new_program(struct rpc_clnt *,
+				const struct rpc_program *, u32);
+struct rpc_clnt *rpc_clone_client(struct rpc_clnt *);
+struct rpc_clnt *rpc_clone_client_set_auth(struct rpc_clnt *,
+				rpc_authflavor_t);
+int		rpc_switch_client_transport(struct rpc_clnt *,
+				struct xprt_create *,
+				const struct rpc_timeout *);
+
+void		rpc_shutdown_client(struct rpc_clnt *);
+void		rpc_release_client(struct rpc_clnt *);
+void		rpc_task_release_transport(struct rpc_task *);
+void		rpc_task_release_client(struct rpc_task *);
+struct rpc_xprt	*rpc_task_get_xprt(struct rpc_clnt *clnt,
+		struct rpc_xprt *xprt);
+
+int		rpcb_create_local(struct net *);
+void		rpcb_put_local(struct net *);
+int		rpcb_register(struct net *, u32, u32, int, unsigned short);
+int		rpcb_v4_register(struct net *net, const u32 program,
+				 const u32 version,
+				 const struct sockaddr *address,
+				 const char *netid);
+void		rpcb_getport_async(struct rpc_task *);
+
+void rpc_prepare_reply_pages(struct rpc_rqst *req, struct page **pages,
+			     unsigned int base, unsigned int len,
+			     unsigned int hdrsize);
+void		rpc_call_start(struct rpc_task *);
+int		rpc_call_async(struct rpc_clnt *clnt,
+			       const struct rpc_message *msg, int flags,
+			       const struct rpc_call_ops *tk_ops,
+			       void *calldata);
+int		rpc_call_sync(struct rpc_clnt *clnt,
+			      const struct rpc_message *msg, int flags);
+struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred,
+			       int flags);
+int		rpc_restart_call_prepare(struct rpc_task *);
+int		rpc_restart_call(struct rpc_task *);
+void		rpc_setbufsize(struct rpc_clnt *, unsigned int, unsigned int);
+struct net *	rpc_net_ns(struct rpc_clnt *);
+size_t		rpc_max_payload(struct rpc_clnt *);
+size_t		rpc_max_bc_payload(struct rpc_clnt *);
+unsigned int	rpc_num_bc_slots(struct rpc_clnt *);
+void		rpc_force_rebind(struct rpc_clnt *);
+size_t		rpc_peeraddr(struct rpc_clnt *, struct sockaddr *, size_t);
+const char	*rpc_peeraddr2str(struct rpc_clnt *, enum rpc_display_format_t);
+int		rpc_localaddr(struct rpc_clnt *, struct sockaddr *, size_t);
+
+int 		rpc_clnt_iterate_for_each_xprt(struct rpc_clnt *clnt,
+			int (*fn)(struct rpc_clnt *, struct rpc_xprt *, void *),
+			void *data);
+
+int 		rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt,
+			struct rpc_xprt_switch *xps,
+			struct rpc_xprt *xprt,
+			void *dummy);
+int		rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *,
+			int (*setup)(struct rpc_clnt *,
+				struct rpc_xprt_switch *,
+				struct rpc_xprt *,
+				void *),
+			void *data);
+void		rpc_set_connect_timeout(struct rpc_clnt *clnt,
+			unsigned long connect_timeout,
+			unsigned long reconnect_timeout);
+
+int		rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *,
+			struct rpc_xprt_switch *,
+			struct rpc_xprt *,
+			void *);
+void		rpc_clnt_manage_trunked_xprts(struct rpc_clnt *);
+void		rpc_clnt_probe_trunked_xprts(struct rpc_clnt *,
+			struct rpc_add_xprt_test *);
+
+const char *rpc_proc_name(const struct rpc_task *task);
+
+void rpc_clnt_xprt_switch_put(struct rpc_clnt *);
+void rpc_clnt_xprt_switch_add_xprt(struct rpc_clnt *, struct rpc_xprt *);
+void rpc_clnt_xprt_switch_remove_xprt(struct rpc_clnt *, struct rpc_xprt *);
+bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
+			const struct sockaddr *sap);
+void rpc_clnt_xprt_set_online(struct rpc_clnt *clnt, struct rpc_xprt *xprt);
+void rpc_clnt_disconnect(struct rpc_clnt *clnt);
+void rpc_cleanup_clids(void);
+
+static inline int rpc_reply_expected(struct rpc_task *task)
+{
+	return (task->tk_msg.rpc_proc != NULL) &&
+		(task->tk_msg.rpc_proc->p_decode != NULL);
+}
+
+static inline void rpc_task_close_connection(struct rpc_task *task)
+{
+	if (task->tk_xprt)
+		xprt_force_disconnect(task->tk_xprt);
+}
+#endif /* _LINUX_SUNRPC_CLNT_H */
diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
new file mode 100644
index 000000000..f6aeed07f
--- /dev/null
+++ b/include/linux/sunrpc/debug.h
@@ -0,0 +1,130 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/debug.h
+ *
+ * Debugging support for sunrpc module
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+#ifndef _LINUX_SUNRPC_DEBUG_H_
+#define _LINUX_SUNRPC_DEBUG_H_
+
+#include <uapi/linux/sunrpc/debug.h>
+
+/*
+ * Debugging macros etc
+ */
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+extern unsigned int		rpc_debug;
+extern unsigned int		nfs_debug;
+extern unsigned int		nfsd_debug;
+extern unsigned int		nlm_debug;
+#endif
+
+#define dprintk(fmt, ...)						\
+	dfprintk(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_cont(fmt, ...)						\
+	dfprintk_cont(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_rcu(fmt, ...)						\
+	dfprintk_rcu(FACILITY, fmt, ##__VA_ARGS__)
+#define dprintk_rcu_cont(fmt, ...)					\
+	dfprintk_rcu_cont(FACILITY, fmt, ##__VA_ARGS__)
+
+#undef ifdebug
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define ifdebug(fac)		if (unlikely(rpc_debug & RPCDBG_##fac))
+
+# define dfprintk(fac, fmt, ...)					\
+do {									\
+	ifdebug(fac)							\
+		printk(KERN_DEFAULT fmt, ##__VA_ARGS__);		\
+} while (0)
+
+# define dfprintk_cont(fac, fmt, ...)					\
+do {									\
+	ifdebug(fac)							\
+		printk(KERN_CONT fmt, ##__VA_ARGS__);			\
+} while (0)
+
+# define dfprintk_rcu(fac, fmt, ...)					\
+do {									\
+	ifdebug(fac) {							\
+		rcu_read_lock();					\
+		printk(KERN_DEFAULT fmt, ##__VA_ARGS__);		\
+		rcu_read_unlock();					\
+	}								\
+} while (0)
+
+# define dfprintk_rcu_cont(fac, fmt, ...)				\
+do {									\
+	ifdebug(fac) {							\
+		rcu_read_lock();					\
+		printk(KERN_CONT fmt, ##__VA_ARGS__);			\
+		rcu_read_unlock();					\
+	}								\
+} while (0)
+
+# define RPC_IFDEBUG(x)		x
+#else
+# define ifdebug(fac)		if (0)
+# define dfprintk(fac, fmt, ...)	do {} while (0)
+# define dfprintk_cont(fac, fmt, ...)	do {} while (0)
+# define dfprintk_rcu(fac, fmt, ...)	do {} while (0)
+# define RPC_IFDEBUG(x)
+#endif
+
+/*
+ * Sysctl interface for RPC debugging
+ */
+
+struct rpc_clnt;
+struct rpc_xprt;
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+void		rpc_register_sysctl(void);
+void		rpc_unregister_sysctl(void);
+void		sunrpc_debugfs_init(void);
+void		sunrpc_debugfs_exit(void);
+void		rpc_clnt_debugfs_register(struct rpc_clnt *);
+void		rpc_clnt_debugfs_unregister(struct rpc_clnt *);
+void		rpc_xprt_debugfs_register(struct rpc_xprt *);
+void		rpc_xprt_debugfs_unregister(struct rpc_xprt *);
+#else
+static inline void
+sunrpc_debugfs_init(void)
+{
+	return;
+}
+
+static inline void
+sunrpc_debugfs_exit(void)
+{
+	return;
+}
+
+static inline void
+rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
+{
+	return;
+}
+
+static inline void
+rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
+{
+	return;
+}
+
+static inline void
+rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
+{
+	return;
+}
+
+static inline void
+rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
+{
+	return;
+}
+#endif
+
+#endif /* _LINUX_SUNRPC_DEBUG_H_ */
diff --git a/include/linux/sunrpc/gss_api.h b/include/linux/sunrpc/gss_api.h
new file mode 100644
index 000000000..bf4ac8a02
--- /dev/null
+++ b/include/linux/sunrpc/gss_api.h
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/gss_api.h
+ *
+ * Somewhat simplified version of the gss api.
+ *
+ * Dug Song <dugsong@monkey.org>
+ * Andy Adamson <andros@umich.edu>
+ * Bruce Fields <bfields@umich.edu>
+ * Copyright (c) 2000 The Regents of the University of Michigan
+ */
+
+#ifndef _LINUX_SUNRPC_GSS_API_H
+#define _LINUX_SUNRPC_GSS_API_H
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/uio.h>
+
+/* The mechanism-independent gss-api context: */
+struct gss_ctx {
+	struct gss_api_mech	*mech_type;
+	void			*internal_ctx_id;
+	unsigned int		slack, align;
+};
+
+#define GSS_C_NO_BUFFER		((struct xdr_netobj) 0)
+#define GSS_C_NO_CONTEXT	((struct gss_ctx *) 0)
+#define GSS_C_QOP_DEFAULT	(0)
+
+/*XXX  arbitrary length - is this set somewhere? */
+#define GSS_OID_MAX_LEN 32
+struct rpcsec_gss_oid {
+	unsigned int	len;
+	u8		data[GSS_OID_MAX_LEN];
+};
+
+/* From RFC 3530 */
+struct rpcsec_gss_info {
+	struct rpcsec_gss_oid	oid;
+	u32			qop;
+	u32			service;
+};
+
+/* gss-api prototypes; note that these are somewhat simplified versions of
+ * the prototypes specified in RFC 2744. */
+int gss_import_sec_context(
+		const void*		input_token,
+		size_t			bufsize,
+		struct gss_api_mech	*mech,
+		struct gss_ctx		**ctx_id,
+		time64_t		*endtime,
+		gfp_t			gfp_mask);
+u32 gss_get_mic(
+		struct gss_ctx		*ctx_id,
+		struct xdr_buf		*message,
+		struct xdr_netobj	*mic_token);
+u32 gss_verify_mic(
+		struct gss_ctx		*ctx_id,
+		struct xdr_buf		*message,
+		struct xdr_netobj	*mic_token);
+u32 gss_wrap(
+		struct gss_ctx		*ctx_id,
+		int			offset,
+		struct xdr_buf		*outbuf,
+		struct page		**inpages);
+u32 gss_unwrap(
+		struct gss_ctx		*ctx_id,
+		int			offset,
+		int			len,
+		struct xdr_buf		*inbuf);
+u32 gss_delete_sec_context(
+		struct gss_ctx		**ctx_id);
+
+rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *, u32 qop,
+					u32 service);
+u32 gss_pseudoflavor_to_service(struct gss_api_mech *, u32 pseudoflavor);
+bool gss_pseudoflavor_to_datatouch(struct gss_api_mech *, u32 pseudoflavor);
+char *gss_service_to_auth_domain_name(struct gss_api_mech *, u32 service);
+
+struct pf_desc {
+	u32	pseudoflavor;
+	u32	qop;
+	u32	service;
+	char	*name;
+	char	*auth_domain_name;
+	struct auth_domain *domain;
+	bool	datatouch;
+};
+
+/* Different mechanisms (e.g., krb5 or spkm3) may implement gss-api, and
+ * mechanisms may be dynamically registered or unregistered by modules. */
+
+/* Each mechanism is described by the following struct: */
+struct gss_api_mech {
+	struct list_head	gm_list;
+	struct module		*gm_owner;
+	struct rpcsec_gss_oid	gm_oid;
+	char			*gm_name;
+	const struct gss_api_ops *gm_ops;
+	/* pseudoflavors supported by this mechanism: */
+	int			gm_pf_num;
+	struct pf_desc *	gm_pfs;
+	/* Should the following be a callback operation instead? */
+	const char		*gm_upcall_enctypes;
+};
+
+/* and must provide the following operations: */
+struct gss_api_ops {
+	int (*gss_import_sec_context)(
+			const void		*input_token,
+			size_t			bufsize,
+			struct gss_ctx		*ctx_id,
+			time64_t		*endtime,
+			gfp_t			gfp_mask);
+	u32 (*gss_get_mic)(
+			struct gss_ctx		*ctx_id,
+			struct xdr_buf		*message,
+			struct xdr_netobj	*mic_token);
+	u32 (*gss_verify_mic)(
+			struct gss_ctx		*ctx_id,
+			struct xdr_buf		*message,
+			struct xdr_netobj	*mic_token);
+	u32 (*gss_wrap)(
+			struct gss_ctx		*ctx_id,
+			int			offset,
+			struct xdr_buf		*outbuf,
+			struct page		**inpages);
+	u32 (*gss_unwrap)(
+			struct gss_ctx		*ctx_id,
+			int			offset,
+			int			len,
+			struct xdr_buf		*buf);
+	void (*gss_delete_sec_context)(
+			void			*internal_ctx_id);
+};
+
+int gss_mech_register(struct gss_api_mech *);
+void gss_mech_unregister(struct gss_api_mech *);
+
+/* returns a mechanism descriptor given an OID, and increments the mechanism's
+ * reference count. */
+struct gss_api_mech * gss_mech_get_by_OID(struct rpcsec_gss_oid *);
+
+/* Given a GSS security tuple, look up a pseudoflavor */
+rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *);
+
+/* Given a pseudoflavor, look up a GSS security tuple */
+int gss_mech_flavor2info(rpc_authflavor_t, struct rpcsec_gss_info *);
+
+/* Returns a reference to a mechanism, given a name like "krb5" etc. */
+struct gss_api_mech *gss_mech_get_by_name(const char *);
+
+/* Similar, but get by pseudoflavor. */
+struct gss_api_mech *gss_mech_get_by_pseudoflavor(u32);
+
+struct gss_api_mech * gss_mech_get(struct gss_api_mech *);
+
+/* For every successful gss_mech_get or gss_mech_get_by_* call there must be a
+ * corresponding call to gss_mech_put. */
+void gss_mech_put(struct gss_api_mech *);
+
+#endif /* _LINUX_SUNRPC_GSS_API_H */
+
diff --git a/include/linux/sunrpc/gss_asn1.h b/include/linux/sunrpc/gss_asn1.h
new file mode 100644
index 000000000..3ccecd0ad
--- /dev/null
+++ b/include/linux/sunrpc/gss_asn1.h
@@ -0,0 +1,81 @@
+/*
+ *  linux/include/linux/sunrpc/gss_asn1.h
+ *
+ *  minimal asn1 for generic encoding/decoding of gss tokens
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
+ *  lib/gssapi/krb5/gssapiP_krb5.h, and others
+ *
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1995 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ */
+
+
+#include <linux/sunrpc/gss_api.h>
+
+#define SIZEOF_INT 4
+
+/* from gssapi_err_generic.h */
+#define G_BAD_SERVICE_NAME                       (-2045022976L)
+#define G_BAD_STRING_UID                         (-2045022975L)
+#define G_NOUSER                                 (-2045022974L)
+#define G_VALIDATE_FAILED                        (-2045022973L)
+#define G_BUFFER_ALLOC                           (-2045022972L)
+#define G_BAD_MSG_CTX                            (-2045022971L)
+#define G_WRONG_SIZE                             (-2045022970L)
+#define G_BAD_USAGE                              (-2045022969L)
+#define G_UNKNOWN_QOP                            (-2045022968L)
+#define G_NO_HOSTNAME                            (-2045022967L)
+#define G_BAD_HOSTNAME                           (-2045022966L)
+#define G_WRONG_MECH                             (-2045022965L)
+#define G_BAD_TOK_HEADER                         (-2045022964L)
+#define G_BAD_DIRECTION                          (-2045022963L)
+#define G_TOK_TRUNC                              (-2045022962L)
+#define G_REFLECT                                (-2045022961L)
+#define G_WRONG_TOKID                            (-2045022960L)
+
+#define g_OID_equal(o1,o2) \
+   (((o1)->len == (o2)->len) && \
+    (memcmp((o1)->data,(o2)->data,(int) (o1)->len) == 0))
+
+u32 g_verify_token_header(
+     struct xdr_netobj *mech,
+     int *body_size,
+     unsigned char **buf_in,
+     int toksize);
+
+int g_token_size(
+     struct xdr_netobj *mech,
+     unsigned int body_size);
+
+void g_make_token_header(
+     struct xdr_netobj *mech,
+     int body_size,
+     unsigned char **buf);
diff --git a/include/linux/sunrpc/gss_err.h b/include/linux/sunrpc/gss_err.h
new file mode 100644
index 000000000..b73c329c8
--- /dev/null
+++ b/include/linux/sunrpc/gss_err.h
@@ -0,0 +1,164 @@
+/*
+ *  linux/include/sunrpc/gss_err.h
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 include/gssapi/gssapi.h
+ *
+ *  Copyright (c) 2002 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ */
+
+/*
+ * Copyright 1993 by OpenVision Technologies, Inc.
+ * 
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appears in all copies and
+ * that both that copyright notice and this permission notice appear in
+ * supporting documentation, and that the name of OpenVision not be used
+ * in advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. OpenVision makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ * 
+ * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _LINUX_SUNRPC_GSS_ERR_H
+#define _LINUX_SUNRPC_GSS_ERR_H
+
+typedef unsigned int OM_uint32;
+
+/*
+ * Flag bits for context-level services.
+ */
+#define GSS_C_DELEG_FLAG 1
+#define GSS_C_MUTUAL_FLAG 2
+#define GSS_C_REPLAY_FLAG 4
+#define GSS_C_SEQUENCE_FLAG 8
+#define GSS_C_CONF_FLAG 16
+#define GSS_C_INTEG_FLAG 32
+#define	GSS_C_ANON_FLAG 64
+#define GSS_C_PROT_READY_FLAG 128
+#define GSS_C_TRANS_FLAG 256
+
+/*
+ * Credential usage options
+ */
+#define GSS_C_BOTH 0
+#define GSS_C_INITIATE 1
+#define GSS_C_ACCEPT 2
+
+/*
+ * Status code types for gss_display_status
+ */
+#define GSS_C_GSS_CODE 1
+#define GSS_C_MECH_CODE 2
+
+
+/*
+ * Expiration time of 2^32-1 seconds means infinite lifetime for a
+ * credential or security context
+ */
+#define GSS_C_INDEFINITE ((OM_uint32) 0xfffffffful)
+
+
+/* Major status codes */
+
+#define GSS_S_COMPLETE 0
+
+/*
+ * Some "helper" definitions to make the status code macros obvious.
+ */
+#define GSS_C_CALLING_ERROR_OFFSET 24
+#define GSS_C_ROUTINE_ERROR_OFFSET 16
+#define GSS_C_SUPPLEMENTARY_OFFSET 0
+#define GSS_C_CALLING_ERROR_MASK ((OM_uint32) 0377ul)
+#define GSS_C_ROUTINE_ERROR_MASK ((OM_uint32) 0377ul)
+#define GSS_C_SUPPLEMENTARY_MASK ((OM_uint32) 0177777ul)
+
+/*
+ * The macros that test status codes for error conditions.  Note that the
+ * GSS_ERROR() macro has changed slightly from the V1 GSSAPI so that it now
+ * evaluates its argument only once.
+ */
+#define GSS_CALLING_ERROR(x) \
+  ((x) & (GSS_C_CALLING_ERROR_MASK << GSS_C_CALLING_ERROR_OFFSET))
+#define GSS_ROUTINE_ERROR(x) \
+  ((x) & (GSS_C_ROUTINE_ERROR_MASK << GSS_C_ROUTINE_ERROR_OFFSET))
+#define GSS_SUPPLEMENTARY_INFO(x) \
+  ((x) & (GSS_C_SUPPLEMENTARY_MASK << GSS_C_SUPPLEMENTARY_OFFSET))
+#define GSS_ERROR(x) \
+  ((x) & ((GSS_C_CALLING_ERROR_MASK << GSS_C_CALLING_ERROR_OFFSET) | \
+	  (GSS_C_ROUTINE_ERROR_MASK << GSS_C_ROUTINE_ERROR_OFFSET)))
+
+/*
+ * Now the actual status code definitions
+ */
+
+/*
+ * Calling errors:
+ */
+#define GSS_S_CALL_INACCESSIBLE_READ \
+                             (((OM_uint32) 1ul) << GSS_C_CALLING_ERROR_OFFSET)
+#define GSS_S_CALL_INACCESSIBLE_WRITE \
+                             (((OM_uint32) 2ul) << GSS_C_CALLING_ERROR_OFFSET)
+#define GSS_S_CALL_BAD_STRUCTURE \
+                             (((OM_uint32) 3ul) << GSS_C_CALLING_ERROR_OFFSET)
+
+/*
+ * Routine errors:
+ */
+#define GSS_S_BAD_MECH (((OM_uint32) 1ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_NAME (((OM_uint32) 2ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_NAMETYPE (((OM_uint32) 3ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_BINDINGS (((OM_uint32) 4ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_STATUS (((OM_uint32) 5ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_SIG (((OM_uint32) 6ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_NO_CRED (((OM_uint32) 7ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_NO_CONTEXT (((OM_uint32) 8ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_DEFECTIVE_TOKEN (((OM_uint32) 9ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_DEFECTIVE_CREDENTIAL \
+     (((OM_uint32) 10ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_CREDENTIALS_EXPIRED \
+     (((OM_uint32) 11ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_CONTEXT_EXPIRED \
+     (((OM_uint32) 12ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_FAILURE (((OM_uint32) 13ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_BAD_QOP (((OM_uint32) 14ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_UNAUTHORIZED (((OM_uint32) 15ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_UNAVAILABLE (((OM_uint32) 16ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_DUPLICATE_ELEMENT \
+     (((OM_uint32) 17ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+#define GSS_S_NAME_NOT_MN \
+     (((OM_uint32) 18ul) << GSS_C_ROUTINE_ERROR_OFFSET)
+
+/*
+ * Supplementary info bits:
+ */
+#define GSS_S_CONTINUE_NEEDED (1 << (GSS_C_SUPPLEMENTARY_OFFSET + 0))
+#define GSS_S_DUPLICATE_TOKEN (1 << (GSS_C_SUPPLEMENTARY_OFFSET + 1))
+#define GSS_S_OLD_TOKEN (1 << (GSS_C_SUPPLEMENTARY_OFFSET + 2))
+#define GSS_S_UNSEQ_TOKEN (1 << (GSS_C_SUPPLEMENTARY_OFFSET + 3))
+#define GSS_S_GAP_TOKEN (1 << (GSS_C_SUPPLEMENTARY_OFFSET + 4))
+
+/* XXXX these are not part of the GSSAPI C bindings!  (but should be) */
+
+#define GSS_CALLING_ERROR_FIELD(x) \
+   (((x) >> GSS_C_CALLING_ERROR_OFFSET) & GSS_C_CALLING_ERROR_MASK)
+#define GSS_ROUTINE_ERROR_FIELD(x) \
+   (((x) >> GSS_C_ROUTINE_ERROR_OFFSET) & GSS_C_ROUTINE_ERROR_MASK)
+#define GSS_SUPPLEMENTARY_INFO_FIELD(x) \
+   (((x) >> GSS_C_SUPPLEMENTARY_OFFSET) & GSS_C_SUPPLEMENTARY_MASK)
+
+/* XXXX This is a necessary evil until the spec is fixed */
+#define GSS_S_CRED_UNAVAIL GSS_S_FAILURE
+
+#endif /* __LINUX_SUNRPC_GSS_ERR_H */
diff --git a/include/linux/sunrpc/gss_krb5.h b/include/linux/sunrpc/gss_krb5.h
new file mode 100644
index 000000000..91f43d868
--- /dev/null
+++ b/include/linux/sunrpc/gss_krb5.h
@@ -0,0 +1,318 @@
+/*
+ *  linux/include/linux/sunrpc/gss_krb5_types.h
+ *
+ *  Adapted from MIT Kerberos 5-1.2.1 lib/include/krb5.h,
+ *  lib/gssapi/krb5/gssapiP_krb5.h, and others
+ *
+ *  Copyright (c) 2000-2008 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Andy Adamson   <andros@umich.edu>
+ *  Bruce Fields   <bfields@umich.edu>
+ */
+
+/*
+ * Copyright 1995 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ */
+
+#include <crypto/skcipher.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/sunrpc/gss_asn1.h>
+
+/* Length of constant used in key derivation */
+#define GSS_KRB5_K5CLENGTH (5)
+
+/* Maximum key length (in bytes) for the supported crypto algorithms*/
+#define GSS_KRB5_MAX_KEYLEN (32)
+
+/* Maximum checksum function output for the supported crypto algorithms */
+#define GSS_KRB5_MAX_CKSUM_LEN  (20)
+
+/* Maximum blocksize for the supported crypto algorithms */
+#define GSS_KRB5_MAX_BLOCKSIZE  (16)
+
+struct krb5_ctx;
+
+struct gss_krb5_enctype {
+	const u32		etype;		/* encryption (key) type */
+	const u32		ctype;		/* checksum type */
+	const char		*name;		/* "friendly" name */
+	const char		*encrypt_name;	/* crypto encrypt name */
+	const char		*cksum_name;	/* crypto checksum name */
+	const u16		signalg;	/* signing algorithm */
+	const u16		sealalg;	/* sealing algorithm */
+	const u32		blocksize;	/* encryption blocksize */
+	const u32		conflen;	/* confounder length
+						   (normally the same as
+						   the blocksize) */
+	const u32		cksumlength;	/* checksum length */
+	const u32		keyed_cksum;	/* is it a keyed cksum? */
+	const u32		keybytes;	/* raw key len, in bytes */
+	const u32		keylength;	/* final key len, in bytes */
+	u32 (*encrypt) (struct crypto_sync_skcipher *tfm,
+			void *iv, void *in, void *out,
+			int length);		/* encryption function */
+	u32 (*decrypt) (struct crypto_sync_skcipher *tfm,
+			void *iv, void *in, void *out,
+			int length);		/* decryption function */
+	u32 (*mk_key) (const struct gss_krb5_enctype *gk5e,
+		       struct xdr_netobj *in,
+		       struct xdr_netobj *out);	/* complete key generation */
+	u32 (*encrypt_v2) (struct krb5_ctx *kctx, u32 offset,
+			   struct xdr_buf *buf,
+			   struct page **pages); /* v2 encryption function */
+	u32 (*decrypt_v2) (struct krb5_ctx *kctx, u32 offset, u32 len,
+			   struct xdr_buf *buf, u32 *headskip,
+			   u32 *tailskip);	/* v2 decryption function */
+};
+
+/* krb5_ctx flags definitions */
+#define KRB5_CTX_FLAG_INITIATOR         0x00000001
+#define KRB5_CTX_FLAG_CFX               0x00000002
+#define KRB5_CTX_FLAG_ACCEPTOR_SUBKEY   0x00000004
+
+struct krb5_ctx {
+	int			initiate; /* 1 = initiating, 0 = accepting */
+	u32			enctype;
+	u32			flags;
+	const struct gss_krb5_enctype *gk5e; /* enctype-specific info */
+	struct crypto_sync_skcipher *enc;
+	struct crypto_sync_skcipher *seq;
+	struct crypto_sync_skcipher *acceptor_enc;
+	struct crypto_sync_skcipher *initiator_enc;
+	struct crypto_sync_skcipher *acceptor_enc_aux;
+	struct crypto_sync_skcipher *initiator_enc_aux;
+	u8			Ksess[GSS_KRB5_MAX_KEYLEN]; /* session key */
+	u8			cksum[GSS_KRB5_MAX_KEYLEN];
+	atomic_t		seq_send;
+	atomic64_t		seq_send64;
+	time64_t		endtime;
+	struct xdr_netobj	mech_used;
+	u8			initiator_sign[GSS_KRB5_MAX_KEYLEN];
+	u8			acceptor_sign[GSS_KRB5_MAX_KEYLEN];
+	u8			initiator_seal[GSS_KRB5_MAX_KEYLEN];
+	u8			acceptor_seal[GSS_KRB5_MAX_KEYLEN];
+	u8			initiator_integ[GSS_KRB5_MAX_KEYLEN];
+	u8			acceptor_integ[GSS_KRB5_MAX_KEYLEN];
+};
+
+/* The length of the Kerberos GSS token header */
+#define GSS_KRB5_TOK_HDR_LEN	(16)
+
+#define KG_TOK_MIC_MSG    0x0101
+#define KG_TOK_WRAP_MSG   0x0201
+
+#define KG2_TOK_INITIAL     0x0101
+#define KG2_TOK_RESPONSE    0x0202
+#define KG2_TOK_MIC         0x0404
+#define KG2_TOK_WRAP        0x0504
+
+#define KG2_TOKEN_FLAG_SENTBYACCEPTOR   0x01
+#define KG2_TOKEN_FLAG_SEALED           0x02
+#define KG2_TOKEN_FLAG_ACCEPTORSUBKEY   0x04
+
+#define KG2_RESP_FLAG_ERROR             0x0001
+#define KG2_RESP_FLAG_DELEG_OK          0x0002
+
+enum sgn_alg {
+	SGN_ALG_DES_MAC_MD5 = 0x0000,
+	SGN_ALG_MD2_5 = 0x0001,
+	SGN_ALG_DES_MAC = 0x0002,
+	SGN_ALG_3 = 0x0003,		/* not published */
+	SGN_ALG_HMAC_SHA1_DES3_KD = 0x0004
+};
+enum seal_alg {
+	SEAL_ALG_NONE = 0xffff,
+	SEAL_ALG_DES = 0x0000,
+	SEAL_ALG_1 = 0x0001,		/* not published */
+	SEAL_ALG_DES3KD = 0x0002
+};
+
+#define CKSUMTYPE_CRC32			0x0001
+#define CKSUMTYPE_RSA_MD4		0x0002
+#define CKSUMTYPE_RSA_MD4_DES		0x0003
+#define CKSUMTYPE_DESCBC		0x0004
+#define CKSUMTYPE_RSA_MD5		0x0007
+#define CKSUMTYPE_RSA_MD5_DES		0x0008
+#define CKSUMTYPE_NIST_SHA		0x0009
+#define CKSUMTYPE_HMAC_SHA1_DES3	0x000c
+#define CKSUMTYPE_HMAC_SHA1_96_AES128   0x000f
+#define CKSUMTYPE_HMAC_SHA1_96_AES256   0x0010
+#define CKSUMTYPE_HMAC_MD5_ARCFOUR      -138 /* Microsoft md5 hmac cksumtype */
+
+/* from gssapi_err_krb5.h */
+#define KG_CCACHE_NOMATCH                        (39756032L)
+#define KG_KEYTAB_NOMATCH                        (39756033L)
+#define KG_TGT_MISSING                           (39756034L)
+#define KG_NO_SUBKEY                             (39756035L)
+#define KG_CONTEXT_ESTABLISHED                   (39756036L)
+#define KG_BAD_SIGN_TYPE                         (39756037L)
+#define KG_BAD_LENGTH                            (39756038L)
+#define KG_CTX_INCOMPLETE                        (39756039L)
+#define KG_CONTEXT                               (39756040L)
+#define KG_CRED                                  (39756041L)
+#define KG_ENC_DESC                              (39756042L)
+#define KG_BAD_SEQ                               (39756043L)
+#define KG_EMPTY_CCACHE                          (39756044L)
+#define KG_NO_CTYPES                             (39756045L)
+
+/* per Kerberos v5 protocol spec crypto types from the wire. 
+ * these get mapped to linux kernel crypto routines.  
+ */
+#define ENCTYPE_NULL            0x0000
+#define ENCTYPE_DES_CBC_CRC     0x0001	/* DES cbc mode with CRC-32 */
+#define ENCTYPE_DES_CBC_MD4     0x0002	/* DES cbc mode with RSA-MD4 */
+#define ENCTYPE_DES_CBC_MD5     0x0003	/* DES cbc mode with RSA-MD5 */
+#define ENCTYPE_DES_CBC_RAW     0x0004	/* DES cbc mode raw */
+/* XXX deprecated? */
+#define ENCTYPE_DES3_CBC_SHA    0x0005	/* DES-3 cbc mode with NIST-SHA */
+#define ENCTYPE_DES3_CBC_RAW    0x0006	/* DES-3 cbc mode raw */
+#define ENCTYPE_DES_HMAC_SHA1   0x0008
+#define ENCTYPE_DES3_CBC_SHA1   0x0010
+#define ENCTYPE_AES128_CTS_HMAC_SHA1_96 0x0011
+#define ENCTYPE_AES256_CTS_HMAC_SHA1_96 0x0012
+#define ENCTYPE_ARCFOUR_HMAC            0x0017
+#define ENCTYPE_ARCFOUR_HMAC_EXP        0x0018
+#define ENCTYPE_UNKNOWN         0x01ff
+
+/*
+ * Constants used for key derivation
+ */
+/* for 3DES */
+#define KG_USAGE_SEAL (22)
+#define KG_USAGE_SIGN (23)
+#define KG_USAGE_SEQ  (24)
+
+/* from rfc3961 */
+#define KEY_USAGE_SEED_CHECKSUM         (0x99)
+#define KEY_USAGE_SEED_ENCRYPTION       (0xAA)
+#define KEY_USAGE_SEED_INTEGRITY        (0x55)
+
+/* from rfc4121 */
+#define KG_USAGE_ACCEPTOR_SEAL  (22)
+#define KG_USAGE_ACCEPTOR_SIGN  (23)
+#define KG_USAGE_INITIATOR_SEAL (24)
+#define KG_USAGE_INITIATOR_SIGN (25)
+
+/*
+ * This compile-time check verifies that we will not exceed the
+ * slack space allotted by the client and server auth_gss code
+ * before they call gss_wrap().
+ */
+#define GSS_KRB5_MAX_SLACK_NEEDED \
+	(GSS_KRB5_TOK_HDR_LEN     /* gss token header */         \
+	+ GSS_KRB5_MAX_CKSUM_LEN  /* gss token checksum */       \
+	+ GSS_KRB5_MAX_BLOCKSIZE  /* confounder */               \
+	+ GSS_KRB5_MAX_BLOCKSIZE  /* possible padding */         \
+	+ GSS_KRB5_TOK_HDR_LEN    /* encrypted hdr in v2 token */\
+	+ GSS_KRB5_MAX_CKSUM_LEN  /* encryption hmac */          \
+	+ 4 + 4                   /* RPC verifier */             \
+	+ GSS_KRB5_TOK_HDR_LEN                                   \
+	+ GSS_KRB5_MAX_CKSUM_LEN)
+
+u32
+make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
+		struct xdr_buf *body, int body_offset, u8 *cksumkey,
+		unsigned int usage, struct xdr_netobj *cksumout);
+
+u32
+make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
+		 struct xdr_buf *body, int body_offset, u8 *key,
+		 unsigned int usage, struct xdr_netobj *cksum);
+
+u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
+		struct xdr_netobj *);
+
+u32 gss_verify_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
+		struct xdr_netobj *);
+
+u32
+gss_wrap_kerberos(struct gss_ctx *ctx_id, int offset,
+		struct xdr_buf *outbuf, struct page **pages);
+
+u32
+gss_unwrap_kerberos(struct gss_ctx *ctx_id, int offset, int len,
+		struct xdr_buf *buf);
+
+
+u32
+krb5_encrypt(struct crypto_sync_skcipher *key,
+	     void *iv, void *in, void *out, int length);
+
+u32
+krb5_decrypt(struct crypto_sync_skcipher *key,
+	     void *iv, void *in, void *out, int length); 
+
+int
+gss_encrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *outbuf,
+		    int offset, struct page **pages);
+
+int
+gss_decrypt_xdr_buf(struct crypto_sync_skcipher *tfm, struct xdr_buf *inbuf,
+		    int offset);
+
+s32
+krb5_make_seq_num(struct krb5_ctx *kctx,
+		struct crypto_sync_skcipher *key,
+		int direction,
+		u32 seqnum, unsigned char *cksum, unsigned char *buf);
+
+s32
+krb5_get_seq_num(struct krb5_ctx *kctx,
+	       unsigned char *cksum,
+	       unsigned char *buf, int *direction, u32 *seqnum);
+
+int
+xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen);
+
+u32
+krb5_derive_key(const struct gss_krb5_enctype *gk5e,
+		const struct xdr_netobj *inkey,
+		struct xdr_netobj *outkey,
+		const struct xdr_netobj *in_constant,
+		gfp_t gfp_mask);
+
+u32
+gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
+		       struct xdr_netobj *randombits,
+		       struct xdr_netobj *key);
+
+u32
+gss_krb5_aes_make_key(const struct gss_krb5_enctype *gk5e,
+		      struct xdr_netobj *randombits,
+		      struct xdr_netobj *key);
+
+u32
+gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
+		     struct xdr_buf *buf,
+		     struct page **pages);
+
+u32
+gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, u32 len,
+		     struct xdr_buf *buf, u32 *plainoffset,
+		     u32 *plainlen);
+
+void
+gss_krb5_make_confounder(char *p, u32 conflen);
diff --git a/include/linux/sunrpc/gss_krb5_enctypes.h b/include/linux/sunrpc/gss_krb5_enctypes.h
new file mode 100644
index 000000000..87eea679d
--- /dev/null
+++ b/include/linux/sunrpc/gss_krb5_enctypes.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Define the string that exports the set of kernel-supported
+ * Kerberos enctypes. This list is sent via upcall to gssd, and
+ * is also exposed via the nfsd /proc API. The consumers generally
+ * treat this as an ordered list, where the first item in the list
+ * is the most preferred.
+ */
+
+#ifndef _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H
+#define _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H
+
+#ifdef CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES
+
+/*
+ * NB: This list includes DES3_CBC_SHA1, which was deprecated by RFC 8429.
+ *
+ * ENCTYPE_AES256_CTS_HMAC_SHA1_96
+ * ENCTYPE_AES128_CTS_HMAC_SHA1_96
+ * ENCTYPE_DES3_CBC_SHA1
+ */
+#define KRB5_SUPPORTED_ENCTYPES "18,17,16"
+
+#else	/* CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES */
+
+/*
+ * NB: This list includes encryption types that were deprecated
+ * by RFC 8429 and RFC 6649.
+ *
+ * ENCTYPE_AES256_CTS_HMAC_SHA1_96
+ * ENCTYPE_AES128_CTS_HMAC_SHA1_96
+ * ENCTYPE_DES3_CBC_SHA1
+ * ENCTYPE_DES_CBC_MD5
+ * ENCTYPE_DES_CBC_CRC
+ * ENCTYPE_DES_CBC_MD4
+ */
+#define KRB5_SUPPORTED_ENCTYPES "18,17,16,3,1,2"
+
+#endif	/* CONFIG_SUNRPC_DISABLE_INSECURE_ENCTYPES */
+
+#endif	/* _LINUX_SUNRPC_GSS_KRB5_ENCTYPES_H */
diff --git a/include/linux/sunrpc/metrics.h b/include/linux/sunrpc/metrics.h
new file mode 100644
index 000000000..0ee3f7052
--- /dev/null
+++ b/include/linux/sunrpc/metrics.h
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/include/linux/sunrpc/metrics.h
+ *
+ *  Declarations for RPC client per-operation metrics
+ *
+ *  Copyright (C) 2005	Chuck Lever <cel@netapp.com>
+ *
+ *  RPC client per-operation statistics provide latency and retry
+ *  information about each type of RPC procedure in a given RPC program.
+ *  These statistics are not for detailed problem diagnosis, but simply
+ *  to indicate whether the problem is local or remote.
+ *
+ *  These counters are not meant to be human-readable, but are meant to be
+ *  integrated into system monitoring tools such as "sar" and "iostat".  As
+ *  such, the counters are sampled by the tools over time, and are never
+ *  zeroed after a file system is mounted.  Moving averages can be computed
+ *  by the tools by taking the difference between two instantaneous samples
+ *  and dividing that by the time between the samples.
+ *
+ *  The counters are maintained in a single array per RPC client, indexed
+ *  by procedure number.  There is no need to maintain separate counter
+ *  arrays per-CPU because these counters are always modified behind locks.
+ */
+
+#ifndef _LINUX_SUNRPC_METRICS_H
+#define _LINUX_SUNRPC_METRICS_H
+
+#include <linux/seq_file.h>
+#include <linux/ktime.h>
+#include <linux/spinlock.h>
+
+#define RPC_IOSTATS_VERS	"1.1"
+
+struct rpc_iostats {
+	spinlock_t		om_lock;
+
+	/*
+	 * These counters give an idea about how many request
+	 * transmissions are required, on average, to complete that
+	 * particular procedure.  Some procedures may require more
+	 * than one transmission because the server is unresponsive,
+	 * the client is retransmitting too aggressively, or the
+	 * requests are large and the network is congested.
+	 */
+	unsigned long		om_ops,		/* count of operations */
+				om_ntrans,	/* count of RPC transmissions */
+				om_timeouts;	/* count of major timeouts */
+
+	/*
+	 * These count how many bytes are sent and received for a
+	 * given RPC procedure type.  This indicates how much load a
+	 * particular procedure is putting on the network.  These
+	 * counts include the RPC and ULP headers, and the request
+	 * payload.
+	 */
+	unsigned long long      om_bytes_sent,	/* count of bytes out */
+				om_bytes_recv;	/* count of bytes in */
+
+	/*
+	 * The length of time an RPC request waits in queue before
+	 * transmission, the network + server latency of the request,
+	 * and the total time the request spent from init to release
+	 * are measured.
+	 */
+	ktime_t			om_queue,	/* queued for xmit */
+				om_rtt,		/* RPC RTT */
+				om_execute;	/* RPC execution */
+	/*
+	 * The count of operations that complete with tk_status < 0.
+	 * These statuses usually indicate error conditions.
+	 */
+	unsigned long           om_error_status;
+} ____cacheline_aligned;
+
+struct rpc_task;
+struct rpc_clnt;
+
+/*
+ * EXPORTed functions for managing rpc_iostats structures
+ */
+
+#ifdef CONFIG_PROC_FS
+
+struct rpc_iostats *	rpc_alloc_iostats(struct rpc_clnt *);
+void			rpc_count_iostats(const struct rpc_task *,
+					  struct rpc_iostats *);
+void			rpc_count_iostats_metrics(const struct rpc_task *,
+					  struct rpc_iostats *);
+void			rpc_clnt_show_stats(struct seq_file *, struct rpc_clnt *);
+void			rpc_free_iostats(struct rpc_iostats *);
+
+#else  /*  CONFIG_PROC_FS  */
+
+static inline struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt) { return NULL; }
+static inline void rpc_count_iostats(const struct rpc_task *task,
+				     struct rpc_iostats *stats) {}
+static inline void rpc_count_iostats_metrics(const struct rpc_task *task,
+					     struct rpc_iostats *stats)
+{
+}
+
+static inline void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt) {}
+static inline void rpc_free_iostats(struct rpc_iostats *stats) {}
+
+#endif  /*  CONFIG_PROC_FS  */
+
+#endif /* _LINUX_SUNRPC_METRICS_H */
diff --git a/include/linux/sunrpc/msg_prot.h b/include/linux/sunrpc/msg_prot.h
new file mode 100644
index 000000000..02117ed0f
--- /dev/null
+++ b/include/linux/sunrpc/msg_prot.h
@@ -0,0 +1,216 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/msg_prot.h
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_MSGPROT_H_
+#define _LINUX_SUNRPC_MSGPROT_H_
+
+#define RPC_VERSION 2
+
+/* spec defines authentication flavor as an unsigned 32 bit integer */
+typedef u32	rpc_authflavor_t;
+
+enum rpc_auth_flavors {
+	RPC_AUTH_NULL  = 0,
+	RPC_AUTH_UNIX  = 1,
+	RPC_AUTH_SHORT = 2,
+	RPC_AUTH_DES   = 3,
+	RPC_AUTH_KRB   = 4,
+	RPC_AUTH_GSS   = 6,
+	RPC_AUTH_TLS   = 7,
+	RPC_AUTH_MAXFLAVOR = 8,
+	/* pseudoflavors: */
+	RPC_AUTH_GSS_KRB5  = 390003,
+	RPC_AUTH_GSS_KRB5I = 390004,
+	RPC_AUTH_GSS_KRB5P = 390005,
+	RPC_AUTH_GSS_LKEY  = 390006,
+	RPC_AUTH_GSS_LKEYI = 390007,
+	RPC_AUTH_GSS_LKEYP = 390008,
+	RPC_AUTH_GSS_SPKM  = 390009,
+	RPC_AUTH_GSS_SPKMI = 390010,
+	RPC_AUTH_GSS_SPKMP = 390011,
+};
+
+/* Maximum size (in bytes) of an rpc credential or verifier */
+#define RPC_MAX_AUTH_SIZE (400)
+
+enum rpc_msg_type {
+	RPC_CALL = 0,
+	RPC_REPLY = 1
+};
+
+enum rpc_reply_stat {
+	RPC_MSG_ACCEPTED = 0,
+	RPC_MSG_DENIED = 1
+};
+
+enum rpc_accept_stat {
+	RPC_SUCCESS = 0,
+	RPC_PROG_UNAVAIL = 1,
+	RPC_PROG_MISMATCH = 2,
+	RPC_PROC_UNAVAIL = 3,
+	RPC_GARBAGE_ARGS = 4,
+	RPC_SYSTEM_ERR = 5,
+	/* internal use only */
+	RPC_DROP_REPLY = 60000,
+};
+
+enum rpc_reject_stat {
+	RPC_MISMATCH = 0,
+	RPC_AUTH_ERROR = 1
+};
+
+enum rpc_auth_stat {
+	RPC_AUTH_OK = 0,
+	RPC_AUTH_BADCRED = 1,
+	RPC_AUTH_REJECTEDCRED = 2,
+	RPC_AUTH_BADVERF = 3,
+	RPC_AUTH_REJECTEDVERF = 4,
+	RPC_AUTH_TOOWEAK = 5,
+	/* RPCSEC_GSS errors */
+	RPCSEC_GSS_CREDPROBLEM = 13,
+	RPCSEC_GSS_CTXPROBLEM = 14
+};
+
+#define RPC_MAXNETNAMELEN	256
+
+/*
+ * From RFC 1831:
+ *
+ * "A record is composed of one or more record fragments.  A record
+ *  fragment is a four-byte header followed by 0 to (2**31) - 1 bytes of
+ *  fragment data.  The bytes encode an unsigned binary number; as with
+ *  XDR integers, the byte order is from highest to lowest.  The number
+ *  encodes two values -- a boolean which indicates whether the fragment
+ *  is the last fragment of the record (bit value 1 implies the fragment
+ *  is the last fragment) and a 31-bit unsigned binary value which is the
+ *  length in bytes of the fragment's data.  The boolean value is the
+ *  highest-order bit of the header; the length is the 31 low-order bits.
+ *  (Note that this record specification is NOT in XDR standard form!)"
+ *
+ * The Linux RPC client always sends its requests in a single record
+ * fragment, limiting the maximum payload size for stream transports to
+ * 2GB.
+ */
+
+typedef __be32	rpc_fraghdr;
+
+#define	RPC_LAST_STREAM_FRAGMENT	(1U << 31)
+#define	RPC_FRAGMENT_SIZE_MASK		(~RPC_LAST_STREAM_FRAGMENT)
+#define	RPC_MAX_FRAGMENT_SIZE		((1U << 31) - 1)
+
+/*
+ * RPC call and reply header size as number of 32bit words (verifier
+ * size computed separately, see below)
+ */
+#define RPC_CALLHDRSIZE		(6)
+#define RPC_REPHDRSIZE		(4)
+
+
+/*
+ * Maximum RPC header size, including authentication,
+ * as number of 32bit words (see RFCs 1831, 1832).
+ *
+ *	xid			    1 xdr unit = 4 bytes
+ *	mtype			    1
+ *	rpc_version		    1
+ *	program			    1
+ *	prog_version		    1
+ *	procedure		    1
+ *	cred {
+ *	    flavor		    1
+ *	    length		    1
+ *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
+ *	}
+ *	verf {
+ *	    flavor		    1
+ *	    length		    1
+ *	    body<RPC_MAX_AUTH_SIZE> 100 xdr units = 400 bytes
+ *	}
+ *	TOTAL			    210 xdr units = 840 bytes
+ */
+#define RPC_MAX_HEADER_WITH_AUTH \
+	(RPC_CALLHDRSIZE + 2*(2+RPC_MAX_AUTH_SIZE/4))
+
+#define RPC_MAX_REPHEADER_WITH_AUTH \
+	(RPC_REPHDRSIZE + (2 + RPC_MAX_AUTH_SIZE/4))
+
+/*
+ * Well-known netids. See:
+ *
+ *   https://www.iana.org/assignments/rpc-netids/rpc-netids.xhtml
+ */
+#define RPCBIND_NETID_UDP	"udp"
+#define RPCBIND_NETID_TCP	"tcp"
+#define RPCBIND_NETID_RDMA	"rdma"
+#define RPCBIND_NETID_SCTP	"sctp"
+#define RPCBIND_NETID_UDP6	"udp6"
+#define RPCBIND_NETID_TCP6	"tcp6"
+#define RPCBIND_NETID_RDMA6	"rdma6"
+#define RPCBIND_NETID_SCTP6	"sctp6"
+#define RPCBIND_NETID_LOCAL	"local"
+
+/*
+ * Note that RFC 1833 does not put any size restrictions on the
+ * netid string, but all currently defined netid's fit in 5 bytes.
+ */
+#define RPCBIND_MAXNETIDLEN	(5u)
+
+/*
+ * Universal addresses are introduced in RFC 1833 and further spelled
+ * out in RFC 3530.  RPCBIND_MAXUADDRLEN defines a maximum byte length
+ * of a universal address for use in allocating buffers and character
+ * arrays.
+ *
+ * Quoting RFC 3530, section 2.2:
+ *
+ * For TCP over IPv4 and for UDP over IPv4, the format of r_addr is the
+ * US-ASCII string:
+ *
+ *	h1.h2.h3.h4.p1.p2
+ *
+ * The prefix, "h1.h2.h3.h4", is the standard textual form for
+ * representing an IPv4 address, which is always four octets long.
+ * Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
+ * the first through fourth octets each converted to ASCII-decimal.
+ * Assuming big-endian ordering, p1 and p2 are, respectively, the first
+ * and second octets each converted to ASCII-decimal.  For example, if a
+ * host, in big-endian order, has an address of 0x0A010307 and there is
+ * a service listening on, in big endian order, port 0x020F (decimal
+ * 527), then the complete universal address is "10.1.3.7.2.15".
+ *
+ * ...
+ *
+ * For TCP over IPv6 and for UDP over IPv6, the format of r_addr is the
+ * US-ASCII string:
+ *
+ *	x1:x2:x3:x4:x5:x6:x7:x8.p1.p2
+ *
+ * The suffix "p1.p2" is the service port, and is computed the same way
+ * as with universal addresses for TCP and UDP over IPv4.  The prefix,
+ * "x1:x2:x3:x4:x5:x6:x7:x8", is the standard textual form for
+ * representing an IPv6 address as defined in Section 2.2 of [RFC2373].
+ * Additionally, the two alternative forms specified in Section 2.2 of
+ * [RFC2373] are also acceptable.
+ */
+
+#include <linux/inet.h>
+
+/* Maximum size of the port number part of a universal address */
+#define RPCBIND_MAXUADDRPLEN	sizeof(".255.255")
+
+/* Maximum size of an IPv4 universal address */
+#define RPCBIND_MAXUADDR4LEN	\
+		(INET_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
+
+/* Maximum size of an IPv6 universal address */
+#define RPCBIND_MAXUADDR6LEN	\
+		(INET6_ADDRSTRLEN + RPCBIND_MAXUADDRPLEN)
+
+/* Assume INET6_ADDRSTRLEN will always be larger than INET_ADDRSTRLEN... */
+#define RPCBIND_MAXUADDRLEN	RPCBIND_MAXUADDR6LEN
+
+#endif /* _LINUX_SUNRPC_MSGPROT_H_ */
diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
new file mode 100644
index 000000000..3b35b6f65
--- /dev/null
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SUNRPC_RPC_PIPE_FS_H
+#define _LINUX_SUNRPC_RPC_PIPE_FS_H
+
+#include <linux/workqueue.h>
+
+struct rpc_pipe_dir_head {
+	struct list_head pdh_entries;
+	struct dentry *pdh_dentry;
+};
+
+struct rpc_pipe_dir_object_ops;
+struct rpc_pipe_dir_object {
+	struct list_head pdo_head;
+	const struct rpc_pipe_dir_object_ops *pdo_ops;
+
+	void *pdo_data;
+};
+
+struct rpc_pipe_dir_object_ops {
+	int (*create)(struct dentry *dir,
+			struct rpc_pipe_dir_object *pdo);
+	void (*destroy)(struct dentry *dir,
+			struct rpc_pipe_dir_object *pdo);
+};
+
+struct rpc_pipe_msg {
+	struct list_head list;
+	void *data;
+	size_t len;
+	size_t copied;
+	int errno;
+};
+
+struct rpc_pipe_ops {
+	ssize_t (*upcall)(struct file *, struct rpc_pipe_msg *, char __user *, size_t);
+	ssize_t (*downcall)(struct file *, const char __user *, size_t);
+	void (*release_pipe)(struct inode *);
+	int (*open_pipe)(struct inode *);
+	void (*destroy_msg)(struct rpc_pipe_msg *);
+};
+
+struct rpc_pipe {
+	struct list_head pipe;
+	struct list_head in_upcall;
+	struct list_head in_downcall;
+	int pipelen;
+	int nreaders;
+	int nwriters;
+#define RPC_PIPE_WAIT_FOR_OPEN	1
+	int flags;
+	struct delayed_work queue_timeout;
+	const struct rpc_pipe_ops *ops;
+	spinlock_t lock;
+	struct dentry *dentry;
+};
+
+struct rpc_inode {
+	struct inode vfs_inode;
+	void *private;
+	struct rpc_pipe *pipe;
+	wait_queue_head_t waitq;
+};
+
+static inline struct rpc_inode *
+RPC_I(struct inode *inode)
+{
+	return container_of(inode, struct rpc_inode, vfs_inode);
+}
+
+enum {
+	SUNRPC_PIPEFS_NFS_PRIO,
+	SUNRPC_PIPEFS_RPC_PRIO,
+};
+
+extern int rpc_pipefs_notifier_register(struct notifier_block *);
+extern void rpc_pipefs_notifier_unregister(struct notifier_block *);
+
+enum {
+	RPC_PIPEFS_MOUNT,
+	RPC_PIPEFS_UMOUNT,
+};
+
+extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
+				      const unsigned char *dir_name);
+extern int rpc_pipefs_init_net(struct net *net);
+extern void rpc_pipefs_exit_net(struct net *net);
+extern struct super_block *rpc_get_sb_net(const struct net *net);
+extern void rpc_put_sb_net(const struct net *net);
+
+extern ssize_t rpc_pipe_generic_upcall(struct file *, struct rpc_pipe_msg *,
+				       char __user *, size_t);
+extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
+
+/* returns true if the msg is in-flight, i.e., already eaten by the peer */
+static inline bool rpc_msg_is_inflight(const struct rpc_pipe_msg *msg) {
+	return (msg->copied != 0 && list_empty(&msg->list));
+}
+
+struct rpc_clnt;
+extern struct dentry *rpc_create_client_dir(struct dentry *, const char *, struct rpc_clnt *);
+extern int rpc_remove_client_dir(struct rpc_clnt *);
+
+extern void rpc_init_pipe_dir_head(struct rpc_pipe_dir_head *pdh);
+extern void rpc_init_pipe_dir_object(struct rpc_pipe_dir_object *pdo,
+		const struct rpc_pipe_dir_object_ops *pdo_ops,
+		void *pdo_data);
+extern int rpc_add_pipe_dir_object(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo);
+extern void rpc_remove_pipe_dir_object(struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		struct rpc_pipe_dir_object *pdo);
+extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
+		struct net *net,
+		struct rpc_pipe_dir_head *pdh,
+		int (*match)(struct rpc_pipe_dir_object *, void *),
+		struct rpc_pipe_dir_object *(*alloc)(void *),
+		void *data);
+
+struct cache_detail;
+extern struct dentry *rpc_create_cache_dir(struct dentry *,
+					   const char *,
+					   umode_t umode,
+					   struct cache_detail *);
+extern void rpc_remove_cache_dir(struct dentry *);
+
+struct rpc_pipe *rpc_mkpipe_data(const struct rpc_pipe_ops *ops, int flags);
+void rpc_destroy_pipe_data(struct rpc_pipe *pipe);
+extern struct dentry *rpc_mkpipe_dentry(struct dentry *, const char *, void *,
+					struct rpc_pipe *);
+extern int rpc_unlink(struct dentry *);
+extern int register_rpc_pipefs(void);
+extern void unregister_rpc_pipefs(void);
+
+extern bool gssd_running(struct net *net);
+
+#endif
diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
new file mode 100644
index 000000000..4af31bbc8
--- /dev/null
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (c) 2015-2017 Oracle. All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_RPC_RDMA_H
+#define _LINUX_SUNRPC_RPC_RDMA_H
+
+#include <linux/types.h>
+#include <linux/bitops.h>
+
+#define RPCRDMA_VERSION		1
+#define rpcrdma_version		cpu_to_be32(RPCRDMA_VERSION)
+
+enum {
+	RPCRDMA_V1_DEF_INLINE_SIZE	= 1024,
+};
+
+/*
+ * XDR sizes, in quads
+ */
+enum {
+	rpcrdma_fixed_maxsz	= 4,
+	rpcrdma_segment_maxsz	= 4,
+	rpcrdma_readseg_maxsz	= 1 + rpcrdma_segment_maxsz,
+	rpcrdma_readchunk_maxsz	= 1 + rpcrdma_readseg_maxsz,
+};
+
+/*
+ * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
+ */
+#define RPCRDMA_HDRLEN_MIN	(sizeof(__be32) * 7)
+#define RPCRDMA_HDRLEN_ERR	(sizeof(__be32) * 5)
+
+enum rpcrdma_errcode {
+	ERR_VERS = 1,
+	ERR_CHUNK = 2
+};
+
+enum rpcrdma_proc {
+	RDMA_MSG = 0,		/* An RPC call or reply msg */
+	RDMA_NOMSG = 1,		/* An RPC call or reply msg - separate body */
+	RDMA_MSGP = 2,		/* An RPC call or reply msg with padding */
+	RDMA_DONE = 3,		/* Client signals reply completion */
+	RDMA_ERROR = 4		/* An RPC RDMA encoding error */
+};
+
+#define rdma_msg	cpu_to_be32(RDMA_MSG)
+#define rdma_nomsg	cpu_to_be32(RDMA_NOMSG)
+#define rdma_msgp	cpu_to_be32(RDMA_MSGP)
+#define rdma_done	cpu_to_be32(RDMA_DONE)
+#define rdma_error	cpu_to_be32(RDMA_ERROR)
+
+#define err_vers	cpu_to_be32(ERR_VERS)
+#define err_chunk	cpu_to_be32(ERR_CHUNK)
+
+/*
+ * Private extension to RPC-over-RDMA Version One.
+ * Message passed during RDMA-CM connection set-up.
+ *
+ * Add new fields at the end, and don't permute existing
+ * fields.
+ */
+struct rpcrdma_connect_private {
+	__be32			cp_magic;
+	u8			cp_version;
+	u8			cp_flags;
+	u8			cp_send_size;
+	u8			cp_recv_size;
+} __packed;
+
+#define rpcrdma_cmp_magic	__cpu_to_be32(0xf6ab0e18)
+
+enum {
+	RPCRDMA_CMP_VERSION		= 1,
+	RPCRDMA_CMP_F_SND_W_INV_OK	= BIT(0),
+};
+
+static inline u8
+rpcrdma_encode_buffer_size(unsigned int size)
+{
+	return (size >> 10) - 1;
+}
+
+static inline unsigned int
+rpcrdma_decode_buffer_size(u8 val)
+{
+	return ((unsigned int)val + 1) << 10;
+}
+
+/**
+ * xdr_encode_rdma_segment - Encode contents of an RDMA segment
+ * @p: Pointer into a send buffer
+ * @handle: The RDMA handle to encode
+ * @length: The RDMA length to encode
+ * @offset: The RDMA offset to encode
+ *
+ * Return value:
+ *   Pointer to the XDR position that follows the encoded RDMA segment
+ */
+static inline __be32 *xdr_encode_rdma_segment(__be32 *p, u32 handle,
+					      u32 length, u64 offset)
+{
+	*p++ = cpu_to_be32(handle);
+	*p++ = cpu_to_be32(length);
+	return xdr_encode_hyper(p, offset);
+}
+
+/**
+ * xdr_encode_read_segment - Encode contents of a Read segment
+ * @p: Pointer into a send buffer
+ * @position: The position to encode
+ * @handle: The RDMA handle to encode
+ * @length: The RDMA length to encode
+ * @offset: The RDMA offset to encode
+ *
+ * Return value:
+ *   Pointer to the XDR position that follows the encoded Read segment
+ */
+static inline __be32 *xdr_encode_read_segment(__be32 *p, u32 position,
+					      u32 handle, u32 length,
+					      u64 offset)
+{
+	*p++ = cpu_to_be32(position);
+	return xdr_encode_rdma_segment(p, handle, length, offset);
+}
+
+/**
+ * xdr_decode_rdma_segment - Decode contents of an RDMA segment
+ * @p: Pointer to the undecoded RDMA segment
+ * @handle: Upon return, the RDMA handle
+ * @length: Upon return, the RDMA length
+ * @offset: Upon return, the RDMA offset
+ *
+ * Return value:
+ *   Pointer to the XDR item that follows the RDMA segment
+ */
+static inline __be32 *xdr_decode_rdma_segment(__be32 *p, u32 *handle,
+					      u32 *length, u64 *offset)
+{
+	*handle = be32_to_cpup(p++);
+	*length = be32_to_cpup(p++);
+	return xdr_decode_hyper(p, offset);
+}
+
+/**
+ * xdr_decode_read_segment - Decode contents of a Read segment
+ * @p: Pointer to the undecoded Read segment
+ * @position: Upon return, the segment's position
+ * @handle: Upon return, the RDMA handle
+ * @length: Upon return, the RDMA length
+ * @offset: Upon return, the RDMA offset
+ *
+ * Return value:
+ *   Pointer to the XDR item that follows the Read segment
+ */
+static inline __be32 *xdr_decode_read_segment(__be32 *p, u32 *position,
+					      u32 *handle, u32 *length,
+					      u64 *offset)
+{
+	*position = be32_to_cpup(p++);
+	return xdr_decode_rdma_segment(p, handle, length, offset);
+}
+
+#endif				/* _LINUX_SUNRPC_RPC_RDMA_H */
diff --git a/include/linux/sunrpc/rpc_rdma_cid.h b/include/linux/sunrpc/rpc_rdma_cid.h
new file mode 100644
index 000000000..be24ab2ba
--- /dev/null
+++ b/include/linux/sunrpc/rpc_rdma_cid.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * * Copyright (c) 2020, Oracle and/or its affiliates.
+ */
+
+#ifndef RPC_RDMA_CID_H
+#define RPC_RDMA_CID_H
+
+/*
+ * The rpc_rdma_cid struct records completion ID information. A
+ * completion ID matches an incoming Send or Receive completion
+ * to a Completion Queue and to a previous ib_post_*(). The ID
+ * can then be displayed in an error message or recorded in a
+ * trace record.
+ *
+ * This struct is shared between the server and client RPC/RDMA
+ * transport implementations.
+ */
+struct rpc_rdma_cid {
+	u32			ci_queue_id;
+	int			ci_completion_id;
+};
+
+#endif	/* RPC_RDMA_CID_H */
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
new file mode 100644
index 000000000..8ada7dc80
--- /dev/null
+++ b/include/linux/sunrpc/sched.h
@@ -0,0 +1,306 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/sched.h
+ *
+ * Scheduling primitives for kernel Sun RPC.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_SCHED_H_
+#define _LINUX_SUNRPC_SCHED_H_
+
+#include <linux/timer.h>
+#include <linux/ktime.h>
+#include <linux/sunrpc/types.h>
+#include <linux/spinlock.h>
+#include <linux/wait_bit.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/xdr.h>
+
+/*
+ * This is the actual RPC procedure call info.
+ */
+struct rpc_procinfo;
+struct rpc_message {
+	const struct rpc_procinfo *rpc_proc;	/* Procedure information */
+	void *			rpc_argp;	/* Arguments */
+	void *			rpc_resp;	/* Result */
+	const struct cred *	rpc_cred;	/* Credentials */
+};
+
+struct rpc_call_ops;
+struct rpc_wait_queue;
+struct rpc_wait {
+	struct list_head	list;		/* wait queue links */
+	struct list_head	links;		/* Links to related tasks */
+	struct list_head	timer_list;	/* Timer list */
+};
+
+/*
+ * This is the RPC task struct
+ */
+struct rpc_task {
+	atomic_t		tk_count;	/* Reference count */
+	int			tk_status;	/* result of last operation */
+	struct list_head	tk_task;	/* global list of tasks */
+
+	/*
+	 * callback	to be executed after waking up
+	 * action	next procedure for async tasks
+	 */
+	void			(*tk_callback)(struct rpc_task *);
+	void			(*tk_action)(struct rpc_task *);
+
+	unsigned long		tk_timeout;	/* timeout for rpc_sleep() */
+	unsigned long		tk_runstate;	/* Task run status */
+
+	struct rpc_wait_queue 	*tk_waitqueue;	/* RPC wait queue we're on */
+	union {
+		struct work_struct	tk_work;	/* Async task work queue */
+		struct rpc_wait		tk_wait;	/* RPC wait */
+	} u;
+
+	/*
+	 * RPC call state
+	 */
+	struct rpc_message	tk_msg;		/* RPC call info */
+	void *			tk_calldata;	/* Caller private data */
+	const struct rpc_call_ops *tk_ops;	/* Caller callbacks */
+
+	struct rpc_clnt *	tk_client;	/* RPC client */
+	struct rpc_xprt *	tk_xprt;	/* Transport */
+	struct rpc_cred *	tk_op_cred;	/* cred being operated on */
+
+	struct rpc_rqst *	tk_rqstp;	/* RPC request */
+
+	struct workqueue_struct	*tk_workqueue;	/* Normally rpciod, but could
+						 * be any workqueue
+						 */
+	ktime_t			tk_start;	/* RPC task init timestamp */
+
+	pid_t			tk_owner;	/* Process id for batching tasks */
+
+	int			tk_rpc_status;	/* Result of last RPC operation */
+	unsigned short		tk_flags;	/* misc flags */
+	unsigned short		tk_timeouts;	/* maj timeouts */
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+	unsigned short		tk_pid;		/* debugging aid */
+#endif
+	unsigned char		tk_priority : 2,/* Task priority */
+				tk_garb_retry : 2,
+				tk_cred_retry : 2;
+};
+
+typedef void			(*rpc_action)(struct rpc_task *);
+
+struct rpc_call_ops {
+	void (*rpc_call_prepare)(struct rpc_task *, void *);
+	void (*rpc_call_done)(struct rpc_task *, void *);
+	void (*rpc_count_stats)(struct rpc_task *, void *);
+	void (*rpc_release)(void *);
+};
+
+struct rpc_task_setup {
+	struct rpc_task *task;
+	struct rpc_clnt *rpc_client;
+	struct rpc_xprt *rpc_xprt;
+	struct rpc_cred *rpc_op_cred;	/* credential being operated on */
+	const struct rpc_message *rpc_message;
+	const struct rpc_call_ops *callback_ops;
+	void *callback_data;
+	struct workqueue_struct *workqueue;
+	unsigned short flags;
+	signed char priority;
+};
+
+/*
+ * RPC task flags
+ */
+#define RPC_TASK_ASYNC		0x0001		/* is an async task */
+#define RPC_TASK_SWAPPER	0x0002		/* is swapping in/out */
+#define RPC_TASK_MOVEABLE	0x0004		/* nfs4.1+ rpc tasks */
+#define RPC_TASK_NULLCREDS	0x0010		/* Use AUTH_NULL credential */
+#define RPC_CALL_MAJORSEEN	0x0020		/* major timeout seen */
+#define RPC_TASK_DYNAMIC	0x0080		/* task was kmalloc'ed */
+#define	RPC_TASK_NO_ROUND_ROBIN	0x0100		/* send requests on "main" xprt */
+#define RPC_TASK_SOFT		0x0200		/* Use soft timeouts */
+#define RPC_TASK_SOFTCONN	0x0400		/* Fail if can't connect */
+#define RPC_TASK_SENT		0x0800		/* message was sent */
+#define RPC_TASK_TIMEOUT	0x1000		/* fail with ETIMEDOUT on timeout */
+#define RPC_TASK_NOCONNECT	0x2000		/* return ENOTCONN if not connected */
+#define RPC_TASK_NO_RETRANS_TIMEOUT	0x4000		/* wait forever for a reply */
+#define RPC_TASK_CRED_NOREF	0x8000		/* No refcount on the credential */
+
+#define RPC_IS_ASYNC(t)		((t)->tk_flags & RPC_TASK_ASYNC)
+#define RPC_IS_SWAPPER(t)	((t)->tk_flags & RPC_TASK_SWAPPER)
+#define RPC_IS_SOFT(t)		((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
+#define RPC_IS_SOFTCONN(t)	((t)->tk_flags & RPC_TASK_SOFTCONN)
+#define RPC_WAS_SENT(t)		((t)->tk_flags & RPC_TASK_SENT)
+#define RPC_IS_MOVEABLE(t)	((t)->tk_flags & RPC_TASK_MOVEABLE)
+
+#define RPC_TASK_RUNNING	0
+#define RPC_TASK_QUEUED		1
+#define RPC_TASK_ACTIVE		2
+#define RPC_TASK_NEED_XMIT	3
+#define RPC_TASK_NEED_RECV	4
+#define RPC_TASK_MSG_PIN_WAIT	5
+#define RPC_TASK_SIGNALLED	6
+
+#define rpc_test_and_set_running(t) \
+				test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
+#define rpc_clear_running(t)	clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
+
+#define RPC_IS_QUEUED(t)	test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
+#define rpc_set_queued(t)	set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
+#define rpc_clear_queued(t)	clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
+
+#define RPC_IS_ACTIVATED(t)	test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
+
+#define RPC_SIGNALLED(t)	test_bit(RPC_TASK_SIGNALLED, &(t)->tk_runstate)
+
+/*
+ * Task priorities.
+ * Note: if you change these, you must also change
+ * the task initialization definitions below.
+ */
+#define RPC_PRIORITY_LOW	(-1)
+#define RPC_PRIORITY_NORMAL	(0)
+#define RPC_PRIORITY_HIGH	(1)
+#define RPC_PRIORITY_PRIVILEGED	(2)
+#define RPC_NR_PRIORITY		(1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
+
+struct rpc_timer {
+	struct list_head list;
+	unsigned long expires;
+	struct delayed_work dwork;
+};
+
+/*
+ * RPC synchronization objects
+ */
+struct rpc_wait_queue {
+	spinlock_t		lock;
+	struct list_head	tasks[RPC_NR_PRIORITY];	/* task queue for each priority level */
+	unsigned char		maxpriority;		/* maximum priority (0 if queue is not a priority queue) */
+	unsigned char		priority;		/* current priority */
+	unsigned char		nr;			/* # tasks remaining for cookie */
+	unsigned short		qlen;			/* total # tasks waiting in queue */
+	struct rpc_timer	timer_list;
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+	const char *		name;
+#endif
+};
+
+/*
+ * This is the # requests to send consecutively
+ * from a single cookie.  The aim is to improve
+ * performance of NFS operations such as read/write.
+ */
+#define RPC_IS_PRIORITY(q)		((q)->maxpriority > 0)
+
+/*
+ * Function prototypes
+ */
+struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
+struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
+struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req);
+void		rpc_put_task(struct rpc_task *);
+void		rpc_put_task_async(struct rpc_task *);
+bool		rpc_task_set_rpc_status(struct rpc_task *task, int rpc_status);
+void		rpc_task_try_cancel(struct rpc_task *task, int error);
+void		rpc_signal_task(struct rpc_task *);
+void		rpc_exit_task(struct rpc_task *);
+void		rpc_exit(struct rpc_task *, int);
+void		rpc_release_calldata(const struct rpc_call_ops *, void *);
+void		rpc_killall_tasks(struct rpc_clnt *);
+unsigned long	rpc_cancel_tasks(struct rpc_clnt *clnt, int error,
+				 bool (*fnmatch)(const struct rpc_task *,
+						 const void *),
+				 const void *data);
+void		rpc_execute(struct rpc_task *);
+void		rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
+void		rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
+void		rpc_destroy_wait_queue(struct rpc_wait_queue *);
+unsigned long	rpc_task_timeout(const struct rpc_task *task);
+void		rpc_sleep_on_timeout(struct rpc_wait_queue *queue,
+					struct rpc_task *task,
+					rpc_action action,
+					unsigned long timeout);
+void		rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
+					rpc_action action);
+void		rpc_sleep_on_priority_timeout(struct rpc_wait_queue *queue,
+					struct rpc_task *task,
+					unsigned long timeout,
+					int priority);
+void		rpc_sleep_on_priority(struct rpc_wait_queue *,
+					struct rpc_task *,
+					int priority);
+void		rpc_wake_up_queued_task(struct rpc_wait_queue *,
+					struct rpc_task *);
+void		rpc_wake_up_queued_task_set_status(struct rpc_wait_queue *,
+						   struct rpc_task *,
+						   int);
+void		rpc_wake_up(struct rpc_wait_queue *);
+struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
+struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
+					struct rpc_wait_queue *,
+					bool (*)(struct rpc_task *, void *),
+					void *);
+struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
+					bool (*)(struct rpc_task *, void *),
+					void *);
+void		rpc_wake_up_status(struct rpc_wait_queue *, int);
+void		rpc_delay(struct rpc_task *, unsigned long);
+int		rpc_malloc(struct rpc_task *);
+void		rpc_free(struct rpc_task *);
+int		rpciod_up(void);
+void		rpciod_down(void);
+int		rpc_wait_for_completion_task(struct rpc_task *task);
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+struct net;
+void		rpc_show_tasks(struct net *);
+#endif
+int		rpc_init_mempool(void);
+void		rpc_destroy_mempool(void);
+extern struct workqueue_struct *rpciod_workqueue;
+extern struct workqueue_struct *xprtiod_workqueue;
+void		rpc_prepare_task(struct rpc_task *task);
+gfp_t		rpc_task_gfp_mask(void);
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+static inline const char * rpc_qname(const struct rpc_wait_queue *q)
+{
+	return ((q && q->name) ? q->name : "unknown");
+}
+
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+		const char *name)
+{
+	q->name = name;
+}
+#else
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+		const char *name)
+{
+}
+#endif
+
+#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
+int rpc_clnt_swap_activate(struct rpc_clnt *clnt);
+void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt);
+#else
+static inline int
+rpc_clnt_swap_activate(struct rpc_clnt *clnt)
+{
+	return -EINVAL;
+}
+
+static inline void
+rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
+{
+}
+#endif /* CONFIG_SUNRPC_SWAP */
+
+#endif /* _LINUX_SUNRPC_SCHED_H_ */
diff --git a/include/linux/sunrpc/stats.h b/include/linux/sunrpc/stats.h
new file mode 100644
index 000000000..d94d4f410
--- /dev/null
+++ b/include/linux/sunrpc/stats.h
@@ -0,0 +1,85 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/stats.h
+ *
+ * Client statistics collection for SUN RPC
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_STATS_H
+#define _LINUX_SUNRPC_STATS_H
+
+#include <linux/proc_fs.h>
+
+struct rpc_stat {
+	const struct rpc_program *program;
+
+	unsigned int		netcnt,
+				netudpcnt,
+				nettcpcnt,
+				nettcpconn,
+				netreconn;
+	unsigned int		rpccnt,
+				rpcretrans,
+				rpcauthrefresh,
+				rpcgarbage;
+};
+
+struct svc_stat {
+	struct svc_program *	program;
+
+	unsigned int		netcnt,
+				netudpcnt,
+				nettcpcnt,
+				nettcpconn;
+	unsigned int		rpccnt,
+				rpcbadfmt,
+				rpcbadauth,
+				rpcbadclnt;
+};
+
+struct net;
+#ifdef CONFIG_PROC_FS
+int			rpc_proc_init(struct net *);
+void			rpc_proc_exit(struct net *);
+#else
+static inline int rpc_proc_init(struct net *net)
+{
+	return 0;
+}
+
+static inline void rpc_proc_exit(struct net *net)
+{
+}
+#endif
+
+#ifdef MODULE
+void			rpc_modcount(struct inode *, int);
+#endif
+
+#ifdef CONFIG_PROC_FS
+struct proc_dir_entry *	rpc_proc_register(struct net *,struct rpc_stat *);
+void			rpc_proc_unregister(struct net *,const char *);
+void			rpc_proc_zero(const struct rpc_program *);
+struct proc_dir_entry *	svc_proc_register(struct net *, struct svc_stat *,
+					  const struct proc_ops *);
+void			svc_proc_unregister(struct net *, const char *);
+
+void			svc_seq_show(struct seq_file *,
+				     const struct svc_stat *);
+#else
+
+static inline struct proc_dir_entry *rpc_proc_register(struct net *net, struct rpc_stat *s) { return NULL; }
+static inline void rpc_proc_unregister(struct net *net, const char *p) {}
+static inline void rpc_proc_zero(const struct rpc_program *p) {}
+
+static inline struct proc_dir_entry *svc_proc_register(struct net *net, struct svc_stat *s,
+						       const struct proc_ops *proc_ops) { return NULL; }
+static inline void svc_proc_unregister(struct net *net, const char *p) {}
+
+static inline void svc_seq_show(struct seq_file *seq,
+				const struct svc_stat *st) {}
+#endif
+
+#endif /* _LINUX_SUNRPC_STATS_H */
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
new file mode 100644
index 000000000..88de45491
--- /dev/null
+++ b/include/linux/sunrpc/svc.h
@@ -0,0 +1,596 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svc.h
+ *
+ * RPC server declarations.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+
+#ifndef SUNRPC_SVC_H
+#define SUNRPC_SVC_H
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/pagevec.h>
+
+/* statistics for svc_pool structures */
+struct svc_pool_stats {
+	atomic_long_t	packets;
+	unsigned long	sockets_queued;
+	atomic_long_t	threads_woken;
+	atomic_long_t	threads_timedout;
+};
+
+/*
+ *
+ * RPC service thread pool.
+ *
+ * Pool of threads and temporary sockets.  Generally there is only
+ * a single one of these per RPC service, but on NUMA machines those
+ * services that can benefit from it (i.e. nfs but not lockd) will
+ * have one pool per NUMA node.  This optimisation reduces cross-
+ * node traffic on multi-node NUMA NFS servers.
+ */
+struct svc_pool {
+	unsigned int		sp_id;	    	/* pool id; also node id on NUMA */
+	spinlock_t		sp_lock;	/* protects all fields */
+	struct list_head	sp_sockets;	/* pending sockets */
+	unsigned int		sp_nrthreads;	/* # of threads in pool */
+	struct list_head	sp_all_threads;	/* all server threads */
+	struct svc_pool_stats	sp_stats;	/* statistics on pool operation */
+#define	SP_TASK_PENDING		(0)		/* still work to do even if no
+						 * xprt is queued. */
+#define SP_CONGESTED		(1)
+	unsigned long		sp_flags;
+} ____cacheline_aligned_in_smp;
+
+/*
+ * RPC service.
+ *
+ * An RPC service is a ``daemon,'' possibly multithreaded, which
+ * receives and processes incoming RPC messages.
+ * It has one or more transport sockets associated with it, and maintains
+ * a list of idle threads waiting for input.
+ *
+ * We currently do not support more than one RPC program per daemon.
+ */
+struct svc_serv {
+	struct svc_program *	sv_program;	/* RPC program */
+	struct svc_stat *	sv_stats;	/* RPC statistics */
+	spinlock_t		sv_lock;
+	struct kref		sv_refcnt;
+	unsigned int		sv_nrthreads;	/* # of server threads */
+	unsigned int		sv_maxconn;	/* max connections allowed or
+						 * '0' causing max to be based
+						 * on number of threads. */
+
+	unsigned int		sv_max_payload;	/* datagram payload size */
+	unsigned int		sv_max_mesg;	/* max_payload + 1 page for overheads */
+	unsigned int		sv_xdrsize;	/* XDR buffer size */
+	struct list_head	sv_permsocks;	/* all permanent sockets */
+	struct list_head	sv_tempsocks;	/* all temporary sockets */
+	int			sv_tmpcnt;	/* count of temporary sockets */
+	struct timer_list	sv_temptimer;	/* timer for aging temporary sockets */
+
+	char *			sv_name;	/* service name */
+
+	unsigned int		sv_nrpools;	/* number of thread pools */
+	struct svc_pool *	sv_pools;	/* array of thread pools */
+	int			(*sv_threadfn)(void *data);
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	struct list_head	sv_cb_list;	/* queue for callback requests
+						 * that arrive over the same
+						 * connection */
+	spinlock_t		sv_cb_lock;	/* protects the svc_cb_list */
+	wait_queue_head_t	sv_cb_waitq;	/* sleep here if there are no
+						 * entries in the svc_cb_list */
+	bool			sv_bc_enabled;	/* service uses backchannel */
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+};
+
+/**
+ * svc_get() - increment reference count on a SUNRPC serv
+ * @serv:  the svc_serv to have count incremented
+ *
+ * Returns: the svc_serv that was passed in.
+ */
+static inline struct svc_serv *svc_get(struct svc_serv *serv)
+{
+	kref_get(&serv->sv_refcnt);
+	return serv;
+}
+
+void svc_destroy(struct kref *);
+
+/**
+ * svc_put - decrement reference count on a SUNRPC serv
+ * @serv:  the svc_serv to have count decremented
+ *
+ * When the reference count reaches zero, svc_destroy()
+ * is called to clean up and free the serv.
+ */
+static inline void svc_put(struct svc_serv *serv)
+{
+	kref_put(&serv->sv_refcnt, svc_destroy);
+}
+
+/**
+ * svc_put_not_last - decrement non-final reference count on SUNRPC serv
+ * @serv:  the svc_serv to have count decremented
+ *
+ * Returns: %true is refcount was decremented.
+ *
+ * If the refcount is 1, it is not decremented and instead failure is reported.
+ */
+static inline bool svc_put_not_last(struct svc_serv *serv)
+{
+	return refcount_dec_not_one(&serv->sv_refcnt.refcount);
+}
+
+/*
+ * Maximum payload size supported by a kernel RPC server.
+ * This is use to determine the max number of pages nfsd is
+ * willing to return in a single READ operation.
+ *
+ * These happen to all be powers of 2, which is not strictly
+ * necessary but helps enforce the real limitation, which is
+ * that they should be multiples of PAGE_SIZE.
+ *
+ * For UDP transports, a block plus NFS,RPC, and UDP headers
+ * has to fit into the IP datagram limit of 64K.  The largest
+ * feasible number for all known page sizes is probably 48K,
+ * but we choose 32K here.  This is the same as the historical
+ * Linux limit; someone who cares more about NFS/UDP performance
+ * can test a larger number.
+ *
+ * For TCP transports we have more freedom.  A size of 1MB is
+ * chosen to match the client limit.  Other OSes are known to
+ * have larger limits, but those numbers are probably beyond
+ * the point of diminishing returns.
+ */
+#define RPCSVC_MAXPAYLOAD	(1*1024*1024u)
+#define RPCSVC_MAXPAYLOAD_TCP	RPCSVC_MAXPAYLOAD
+#define RPCSVC_MAXPAYLOAD_UDP	(32*1024u)
+
+extern u32 svc_max_payload(const struct svc_rqst *rqstp);
+
+/*
+ * RPC Requsts and replies are stored in one or more pages.
+ * We maintain an array of pages for each server thread.
+ * Requests are copied into these pages as they arrive.  Remaining
+ * pages are available to write the reply into.
+ *
+ * Pages are sent using ->sendpage so each server thread needs to
+ * allocate more to replace those used in sending.  To help keep track
+ * of these pages we have a receive list where all pages initialy live,
+ * and a send list where pages are moved to when there are to be part
+ * of a reply.
+ *
+ * We use xdr_buf for holding responses as it fits well with NFS
+ * read responses (that have a header, and some data pages, and possibly
+ * a tail) and means we can share some client side routines.
+ *
+ * The xdr_buf.head kvec always points to the first page in the rq_*pages
+ * list.  The xdr_buf.pages pointer points to the second page on that
+ * list.  xdr_buf.tail points to the end of the first page.
+ * This assumes that the non-page part of an rpc reply will fit
+ * in a page - NFSd ensures this.  lockd also has no trouble.
+ *
+ * Each request/reply pair can have at most one "payload", plus two pages,
+ * one for the request, and one for the reply.
+ * We using ->sendfile to return read data, we might need one extra page
+ * if the request is not page-aligned.  So add another '1'.
+ */
+#define RPCSVC_MAXPAGES		((RPCSVC_MAXPAYLOAD+PAGE_SIZE-1)/PAGE_SIZE \
+				+ 2 + 1)
+
+static inline u32 svc_getnl(struct kvec *iov)
+{
+	__be32 val, *vp;
+	vp = iov->iov_base;
+	val = *vp++;
+	iov->iov_base = (void*)vp;
+	iov->iov_len -= sizeof(__be32);
+	return ntohl(val);
+}
+
+static inline void svc_putnl(struct kvec *iov, u32 val)
+{
+	__be32 *vp = iov->iov_base + iov->iov_len;
+	*vp = htonl(val);
+	iov->iov_len += sizeof(__be32);
+}
+
+static inline __be32 svc_getu32(struct kvec *iov)
+{
+	__be32 val, *vp;
+	vp = iov->iov_base;
+	val = *vp++;
+	iov->iov_base = (void*)vp;
+	iov->iov_len -= sizeof(__be32);
+	return val;
+}
+
+static inline void svc_ungetu32(struct kvec *iov)
+{
+	__be32 *vp = (__be32 *)iov->iov_base;
+	iov->iov_base = (void *)(vp - 1);
+	iov->iov_len += sizeof(*vp);
+}
+
+static inline void svc_putu32(struct kvec *iov, __be32 val)
+{
+	__be32 *vp = iov->iov_base + iov->iov_len;
+	*vp = val;
+	iov->iov_len += sizeof(__be32);
+}
+
+/*
+ * The context of a single thread, including the request currently being
+ * processed.
+ */
+struct svc_rqst {
+	struct list_head	rq_all;		/* all threads list */
+	struct rcu_head		rq_rcu_head;	/* for RCU deferred kfree */
+	struct svc_xprt *	rq_xprt;	/* transport ptr */
+
+	struct sockaddr_storage	rq_addr;	/* peer address */
+	size_t			rq_addrlen;
+	struct sockaddr_storage	rq_daddr;	/* dest addr of request
+						 *  - reply from here */
+	size_t			rq_daddrlen;
+
+	struct svc_serv *	rq_server;	/* RPC service definition */
+	struct svc_pool *	rq_pool;	/* thread pool */
+	const struct svc_procedure *rq_procinfo;/* procedure info */
+	struct auth_ops *	rq_authop;	/* authentication flavour */
+	struct svc_cred		rq_cred;	/* auth info */
+	void *			rq_xprt_ctxt;	/* transport specific context ptr */
+	struct svc_deferred_req*rq_deferred;	/* deferred request we are replaying */
+
+	struct xdr_buf		rq_arg;
+	struct xdr_stream	rq_arg_stream;
+	struct xdr_stream	rq_res_stream;
+	struct page		*rq_scratch_page;
+	struct xdr_buf		rq_res;
+	struct page		*rq_pages[RPCSVC_MAXPAGES + 1];
+	struct page *		*rq_respages;	/* points into rq_pages */
+	struct page *		*rq_next_page; /* next reply page to use */
+	struct page *		*rq_page_end;  /* one past the last page */
+
+	struct pagevec		rq_pvec;
+	struct kvec		rq_vec[RPCSVC_MAXPAGES]; /* generally useful.. */
+	struct bio_vec		rq_bvec[RPCSVC_MAXPAGES];
+
+	__be32			rq_xid;		/* transmission id */
+	u32			rq_prog;	/* program number */
+	u32			rq_vers;	/* program version */
+	u32			rq_proc;	/* procedure number */
+	u32			rq_prot;	/* IP protocol */
+	int			rq_cachetype;	/* catering to nfsd */
+#define	RQ_SECURE	(0)			/* secure port */
+#define	RQ_LOCAL	(1)			/* local request */
+#define	RQ_USEDEFERRAL	(2)			/* use deferral */
+#define	RQ_DROPME	(3)			/* drop current reply */
+#define	RQ_SPLICE_OK	(4)			/* turned off in gss privacy
+						 * to prevent encrypting page
+						 * cache pages */
+#define	RQ_VICTIM	(5)			/* about to be shut down */
+#define	RQ_BUSY		(6)			/* request is busy */
+#define	RQ_DATA		(7)			/* request has data */
+	unsigned long		rq_flags;	/* flags field */
+	ktime_t			rq_qtime;	/* enqueue time */
+
+	void *			rq_argp;	/* decoded arguments */
+	void *			rq_resp;	/* xdr'd results */
+	void *			rq_auth_data;	/* flavor-specific data */
+	__be32			rq_auth_stat;	/* authentication status */
+	int			rq_auth_slack;	/* extra space xdr code
+						 * should leave in head
+						 * for krb5i, krb5p.
+						 */
+	int			rq_reserved;	/* space on socket outq
+						 * reserved for this request
+						 */
+	ktime_t			rq_stime;	/* start time */
+
+	struct cache_req	rq_chandle;	/* handle passed to caches for 
+						 * request delaying 
+						 */
+	/* Catering to nfsd */
+	struct auth_domain *	rq_client;	/* RPC peer info */
+	struct auth_domain *	rq_gssclient;	/* "gss/"-style peer info */
+	struct svc_cacherep *	rq_cacherep;	/* cache info */
+	struct task_struct	*rq_task;	/* service thread */
+	spinlock_t		rq_lock;	/* per-request lock */
+	struct net		*rq_bc_net;	/* pointer to backchannel's
+						 * net namespace
+						 */
+	void **			rq_lease_breaker; /* The v4 client breaking a lease */
+};
+
+#define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
+
+/*
+ * Rigorous type checking on sockaddr type conversions
+ */
+static inline struct sockaddr_in *svc_addr_in(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr_in *) &rqst->rq_addr;
+}
+
+static inline struct sockaddr_in6 *svc_addr_in6(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr_in6 *) &rqst->rq_addr;
+}
+
+static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr *) &rqst->rq_addr;
+}
+
+static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr_in *) &rqst->rq_daddr;
+}
+
+static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr_in6 *) &rqst->rq_daddr;
+}
+
+static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
+{
+	return (struct sockaddr *) &rqst->rq_daddr;
+}
+
+/*
+ * Check buffer bounds after decoding arguments
+ */
+static inline int
+xdr_argsize_check(struct svc_rqst *rqstp, __be32 *p)
+{
+	char *cp = (char *)p;
+	struct kvec *vec = &rqstp->rq_arg.head[0];
+	return cp >= (char*)vec->iov_base
+		&& cp <= (char*)vec->iov_base + vec->iov_len;
+}
+
+static inline int
+xdr_ressize_check(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct kvec *vec = &rqstp->rq_res.head[0];
+	char *cp = (char*)p;
+
+	vec->iov_len = cp - (char*)vec->iov_base;
+
+	return vec->iov_len <= PAGE_SIZE;
+}
+
+static inline void svc_free_res_pages(struct svc_rqst *rqstp)
+{
+	while (rqstp->rq_next_page != rqstp->rq_respages) {
+		struct page **pp = --rqstp->rq_next_page;
+		if (*pp) {
+			put_page(*pp);
+			*pp = NULL;
+		}
+	}
+}
+
+struct svc_deferred_req {
+	u32			prot;	/* protocol (UDP or TCP) */
+	struct svc_xprt		*xprt;
+	struct sockaddr_storage	addr;	/* where reply must go */
+	size_t			addrlen;
+	struct sockaddr_storage	daddr;	/* where reply must come from */
+	size_t			daddrlen;
+	void			*xprt_ctxt;
+	struct cache_deferred_req handle;
+	int			argslen;
+	__be32			args[];
+};
+
+struct svc_process_info {
+	union {
+		int  (*dispatch)(struct svc_rqst *, __be32 *);
+		struct {
+			unsigned int lovers;
+			unsigned int hivers;
+		} mismatch;
+	};
+};
+
+/*
+ * List of RPC programs on the same transport endpoint
+ */
+struct svc_program {
+	struct svc_program *	pg_next;	/* other programs (same xprt) */
+	u32			pg_prog;	/* program number */
+	unsigned int		pg_lovers;	/* lowest version */
+	unsigned int		pg_hivers;	/* highest version */
+	unsigned int		pg_nvers;	/* number of versions */
+	const struct svc_version **pg_vers;	/* version array */
+	char *			pg_name;	/* service name */
+	char *			pg_class;	/* class name: services sharing authentication */
+	struct svc_stat *	pg_stats;	/* rpc statistics */
+	int			(*pg_authenticate)(struct svc_rqst *);
+	__be32			(*pg_init_request)(struct svc_rqst *,
+						   const struct svc_program *,
+						   struct svc_process_info *);
+	int			(*pg_rpcbind_set)(struct net *net,
+						  const struct svc_program *,
+						  u32 version, int family,
+						  unsigned short proto,
+						  unsigned short port);
+};
+
+/*
+ * RPC program version
+ */
+struct svc_version {
+	u32			vs_vers;	/* version number */
+	u32			vs_nproc;	/* number of procedures */
+	const struct svc_procedure *vs_proc;	/* per-procedure info */
+	unsigned int		*vs_count;	/* call counts */
+	u32			vs_xdrsize;	/* xdrsize needed for this version */
+
+	/* Don't register with rpcbind */
+	bool			vs_hidden;
+
+	/* Don't care if the rpcbind registration fails */
+	bool			vs_rpcb_optnl;
+
+	/* Need xprt with congestion control */
+	bool			vs_need_cong_ctrl;
+
+	/* Dispatch function */
+	int			(*vs_dispatch)(struct svc_rqst *, __be32 *);
+};
+
+/*
+ * RPC procedure info
+ */
+struct svc_procedure {
+	/* process the request: */
+	__be32			(*pc_func)(struct svc_rqst *);
+	/* XDR decode args: */
+	bool			(*pc_decode)(struct svc_rqst *rqstp,
+					     struct xdr_stream *xdr);
+	/* XDR encode result: */
+	bool			(*pc_encode)(struct svc_rqst *rqstp,
+					     struct xdr_stream *xdr);
+	/* XDR free result: */
+	void			(*pc_release)(struct svc_rqst *);
+	unsigned int		pc_argsize;	/* argument struct size */
+	unsigned int		pc_argzero;	/* how much of argument to clear */
+	unsigned int		pc_ressize;	/* result struct size */
+	unsigned int		pc_cachetype;	/* cache info (NFS) */
+	unsigned int		pc_xdrressize;	/* maximum size of XDR reply */
+	const char *		pc_name;	/* for display */
+};
+
+/*
+ * Function prototypes.
+ */
+int svc_rpcb_setup(struct svc_serv *serv, struct net *net);
+void svc_rpcb_cleanup(struct svc_serv *serv, struct net *net);
+int svc_bind(struct svc_serv *serv, struct net *net);
+struct svc_serv *svc_create(struct svc_program *, unsigned int,
+			    int (*threadfn)(void *data));
+struct svc_rqst *svc_rqst_alloc(struct svc_serv *serv,
+					struct svc_pool *pool, int node);
+void		   svc_rqst_replace_page(struct svc_rqst *rqstp,
+					 struct page *page);
+void		   svc_rqst_free(struct svc_rqst *);
+void		   svc_exit_thread(struct svc_rqst *);
+struct svc_serv *  svc_create_pooled(struct svc_program *, unsigned int,
+				     int (*threadfn)(void *data));
+int		   svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
+int		   svc_pool_stats_open(struct svc_serv *serv, struct file *file);
+int		   svc_process(struct svc_rqst *);
+int		   bc_svc_process(struct svc_serv *, struct rpc_rqst *,
+			struct svc_rqst *);
+int		   svc_register(const struct svc_serv *, struct net *, const int,
+				const unsigned short, const unsigned short);
+
+void		   svc_wake_up(struct svc_serv *);
+void		   svc_reserve(struct svc_rqst *rqstp, int space);
+struct svc_pool   *svc_pool_for_cpu(struct svc_serv *serv);
+char *		   svc_print_addr(struct svc_rqst *, char *, size_t);
+const char *	   svc_proc_name(const struct svc_rqst *rqstp);
+int		   svc_encode_result_payload(struct svc_rqst *rqstp,
+					     unsigned int offset,
+					     unsigned int length);
+unsigned int	   svc_fill_write_vector(struct svc_rqst *rqstp,
+					 struct xdr_buf *payload);
+char		  *svc_fill_symlink_pathname(struct svc_rqst *rqstp,
+					     struct kvec *first, void *p,
+					     size_t total);
+__be32		   svc_generic_init_request(struct svc_rqst *rqstp,
+					    const struct svc_program *progp,
+					    struct svc_process_info *procinfo);
+int		   svc_generic_rpcbind_set(struct net *net,
+					   const struct svc_program *progp,
+					   u32 version, int family,
+					   unsigned short proto,
+					   unsigned short port);
+int		   svc_rpcbind_set_version(struct net *net,
+					   const struct svc_program *progp,
+					   u32 version, int family,
+					   unsigned short proto,
+					   unsigned short port);
+
+#define	RPC_MAX_ADDRBUFLEN	(63U)
+
+/*
+ * When we want to reduce the size of the reserved space in the response
+ * buffer, we need to take into account the size of any checksum data that
+ * may be at the end of the packet. This is difficult to determine exactly
+ * for all cases without actually generating the checksum, so we just use a
+ * static value.
+ */
+static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space)
+{
+	svc_reserve(rqstp, space + rqstp->rq_auth_slack);
+}
+
+/**
+ * svcxdr_init_decode - Prepare an xdr_stream for Call decoding
+ * @rqstp: controlling server RPC transaction context
+ *
+ * This function currently assumes the RPC header in rq_arg has
+ * already been decoded. Upon return, xdr->p points to the
+ * location of the upper layer header.
+ */
+static inline void svcxdr_init_decode(struct svc_rqst *rqstp)
+{
+	struct xdr_stream *xdr = &rqstp->rq_arg_stream;
+	struct xdr_buf *buf = &rqstp->rq_arg;
+	struct kvec *argv = buf->head;
+
+	/*
+	 * svc_getnl() and friends do not keep the xdr_buf's ::len
+	 * field up to date. Refresh that field before initializing
+	 * the argument decoding stream.
+	 */
+	buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len;
+
+	xdr_init_decode(xdr, buf, argv->iov_base, NULL);
+	xdr_set_scratch_page(xdr, rqstp->rq_scratch_page);
+}
+
+/**
+ * svcxdr_init_encode - Prepare an xdr_stream for svc Reply encoding
+ * @rqstp: controlling server RPC transaction context
+ *
+ */
+static inline void svcxdr_init_encode(struct svc_rqst *rqstp)
+{
+	struct xdr_stream *xdr = &rqstp->rq_res_stream;
+	struct xdr_buf *buf = &rqstp->rq_res;
+	struct kvec *resv = buf->head;
+
+	xdr_reset_scratch_buffer(xdr);
+
+	xdr->buf = buf;
+	xdr->iov = resv;
+	xdr->p   = resv->iov_base + resv->iov_len;
+	xdr->end = resv->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
+	buf->len = resv->iov_len;
+	xdr->page_ptr = buf->pages - 1;
+	buf->buflen = PAGE_SIZE * (rqstp->rq_page_end - buf->pages);
+	buf->buflen -= rqstp->rq_auth_slack;
+	xdr->rqst = NULL;
+}
+
+#endif /* SUNRPC_SVC_H */
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
new file mode 100644
index 000000000..fbc4bd423
--- /dev/null
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -0,0 +1,225 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Tom Tucker <tom@opengridcomputing.com>
+ */
+
+#ifndef SVC_RDMA_H
+#define SVC_RDMA_H
+#include <linux/llist.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/sunrpc/rpc_rdma_cid.h>
+#include <linux/sunrpc/svc_rdma_pcl.h>
+
+#include <linux/percpu_counter.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+/* Default and maximum inline threshold sizes */
+enum {
+	RPCRDMA_PULLUP_THRESH = RPCRDMA_V1_DEF_INLINE_SIZE >> 1,
+	RPCRDMA_DEF_INLINE_THRESH = 4096,
+	RPCRDMA_MAX_INLINE_THRESH = 65536
+};
+
+/* RPC/RDMA parameters and stats */
+extern unsigned int svcrdma_ord;
+extern unsigned int svcrdma_max_requests;
+extern unsigned int svcrdma_max_bc_requests;
+extern unsigned int svcrdma_max_req_size;
+
+extern struct percpu_counter svcrdma_stat_read;
+extern struct percpu_counter svcrdma_stat_recv;
+extern struct percpu_counter svcrdma_stat_sq_starve;
+extern struct percpu_counter svcrdma_stat_write;
+
+struct svcxprt_rdma {
+	struct svc_xprt      sc_xprt;		/* SVC transport structure */
+	struct rdma_cm_id    *sc_cm_id;		/* RDMA connection id */
+	struct list_head     sc_accept_q;	/* Conn. waiting accept */
+	int		     sc_ord;		/* RDMA read limit */
+	int                  sc_max_send_sges;
+	bool		     sc_snd_w_inv;	/* OK to use Send With Invalidate */
+
+	atomic_t             sc_sq_avail;	/* SQEs ready to be consumed */
+	unsigned int	     sc_sq_depth;	/* Depth of SQ */
+	__be32		     sc_fc_credits;	/* Forward credits */
+	u32		     sc_max_requests;	/* Max requests */
+	u32		     sc_max_bc_requests;/* Backward credits */
+	int                  sc_max_req_size;	/* Size of each RQ WR buf */
+	u8		     sc_port_num;
+
+	struct ib_pd         *sc_pd;
+
+	spinlock_t	     sc_send_lock;
+	struct llist_head    sc_send_ctxts;
+	spinlock_t	     sc_rw_ctxt_lock;
+	struct llist_head    sc_rw_ctxts;
+
+	u32		     sc_pending_recvs;
+	u32		     sc_recv_batch;
+	struct list_head     sc_rq_dto_q;
+	spinlock_t	     sc_rq_dto_lock;
+	struct ib_qp         *sc_qp;
+	struct ib_cq         *sc_rq_cq;
+	struct ib_cq         *sc_sq_cq;
+
+	spinlock_t	     sc_lock;		/* transport lock */
+
+	wait_queue_head_t    sc_send_wait;	/* SQ exhaustion waitlist */
+	unsigned long	     sc_flags;
+	struct work_struct   sc_work;
+
+	struct llist_head    sc_recv_ctxts;
+
+	atomic_t	     sc_completion_ids;
+};
+/* sc_flags */
+#define RDMAXPRT_CONN_PENDING	3
+
+/*
+ * Default connection parameters
+ */
+enum {
+	RPCRDMA_LISTEN_BACKLOG	= 10,
+	RPCRDMA_MAX_REQUESTS	= 64,
+	RPCRDMA_MAX_BC_REQUESTS	= 2,
+};
+
+#define RPCSVC_MAXPAYLOAD_RDMA	RPCSVC_MAXPAYLOAD
+
+struct svc_rdma_recv_ctxt {
+	struct llist_node	rc_node;
+	struct list_head	rc_list;
+	struct ib_recv_wr	rc_recv_wr;
+	struct ib_cqe		rc_cqe;
+	struct rpc_rdma_cid	rc_cid;
+	struct ib_sge		rc_recv_sge;
+	void			*rc_recv_buf;
+	struct xdr_stream	rc_stream;
+	bool			rc_temp;
+	u32			rc_byte_len;
+	unsigned int		rc_page_count;
+	u32			rc_inv_rkey;
+	__be32			rc_msgtype;
+
+	struct svc_rdma_pcl	rc_call_pcl;
+
+	struct svc_rdma_pcl	rc_read_pcl;
+	struct svc_rdma_chunk	*rc_cur_result_payload;
+	struct svc_rdma_pcl	rc_write_pcl;
+	struct svc_rdma_pcl	rc_reply_pcl;
+};
+
+struct svc_rdma_send_ctxt {
+	struct llist_node	sc_node;
+	struct rpc_rdma_cid	sc_cid;
+
+	struct ib_send_wr	sc_send_wr;
+	struct ib_cqe		sc_cqe;
+	struct completion	sc_done;
+	struct xdr_buf		sc_hdrbuf;
+	struct xdr_stream	sc_stream;
+	void			*sc_xprt_buf;
+	int			sc_cur_sge_no;
+
+	struct ib_sge		sc_sges[];
+};
+
+/* svc_rdma_backchannel.c */
+extern void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp,
+				     struct svc_rdma_recv_ctxt *rctxt);
+
+/* svc_rdma_recvfrom.c */
+extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
+extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
+extern struct svc_rdma_recv_ctxt *
+		svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma);
+extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
+				   struct svc_rdma_recv_ctxt *ctxt);
+extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
+extern void svc_rdma_release_ctxt(struct svc_xprt *xprt, void *ctxt);
+extern int svc_rdma_recvfrom(struct svc_rqst *);
+
+/* svc_rdma_rw.c */
+extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
+extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
+				     const struct svc_rdma_chunk *chunk,
+				     const struct xdr_buf *xdr);
+extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
+				     const struct svc_rdma_recv_ctxt *rctxt,
+				     const struct xdr_buf *xdr);
+extern int svc_rdma_process_read_list(struct svcxprt_rdma *rdma,
+				      struct svc_rqst *rqstp,
+				      struct svc_rdma_recv_ctxt *head);
+
+/* svc_rdma_sendto.c */
+extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
+extern struct svc_rdma_send_ctxt *
+		svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
+extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
+				   struct svc_rdma_send_ctxt *ctxt);
+extern int svc_rdma_send(struct svcxprt_rdma *rdma,
+			 struct svc_rdma_send_ctxt *ctxt);
+extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
+				  struct svc_rdma_send_ctxt *sctxt,
+				  const struct svc_rdma_recv_ctxt *rctxt,
+				  const struct xdr_buf *xdr);
+extern void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
+				    struct svc_rdma_send_ctxt *sctxt,
+				    struct svc_rdma_recv_ctxt *rctxt,
+				    int status);
+extern void svc_rdma_wake_send_waiters(struct svcxprt_rdma *rdma, int avail);
+extern int svc_rdma_sendto(struct svc_rqst *);
+extern int svc_rdma_result_payload(struct svc_rqst *rqstp, unsigned int offset,
+				   unsigned int length);
+
+/* svc_rdma_transport.c */
+extern struct svc_xprt_class svc_rdma_class;
+#ifdef CONFIG_SUNRPC_BACKCHANNEL
+extern struct svc_xprt_class svc_rdma_bc_class;
+#endif
+
+/* svc_rdma.c */
+extern int svc_rdma_init(void);
+extern void svc_rdma_cleanup(void);
+
+#endif
diff --git a/include/linux/sunrpc/svc_rdma_pcl.h b/include/linux/sunrpc/svc_rdma_pcl.h
new file mode 100644
index 000000000..7516ad0fa
--- /dev/null
+++ b/include/linux/sunrpc/svc_rdma_pcl.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates
+ */
+
+#ifndef SVC_RDMA_PCL_H
+#define SVC_RDMA_PCL_H
+
+#include <linux/list.h>
+
+struct svc_rdma_segment {
+	u32			rs_handle;
+	u32			rs_length;
+	u64			rs_offset;
+};
+
+struct svc_rdma_chunk {
+	struct list_head	ch_list;
+
+	u32			ch_position;
+	u32			ch_length;
+	u32			ch_payload_length;
+
+	u32			ch_segcount;
+	struct svc_rdma_segment	ch_segments[];
+};
+
+struct svc_rdma_pcl {
+	unsigned int		cl_count;
+	struct list_head	cl_chunks;
+};
+
+/**
+ * pcl_init - Initialize a parsed chunk list
+ * @pcl: parsed chunk list to initialize
+ *
+ */
+static inline void pcl_init(struct svc_rdma_pcl *pcl)
+{
+	INIT_LIST_HEAD(&pcl->cl_chunks);
+}
+
+/**
+ * pcl_is_empty - Return true if parsed chunk list is empty
+ * @pcl: parsed chunk list
+ *
+ */
+static inline bool pcl_is_empty(const struct svc_rdma_pcl *pcl)
+{
+	return list_empty(&pcl->cl_chunks);
+}
+
+/**
+ * pcl_first_chunk - Return first chunk in a parsed chunk list
+ * @pcl: parsed chunk list
+ *
+ * Returns the first chunk in the list, or NULL if the list is empty.
+ */
+static inline struct svc_rdma_chunk *
+pcl_first_chunk(const struct svc_rdma_pcl *pcl)
+{
+	if (pcl_is_empty(pcl))
+		return NULL;
+	return list_first_entry(&pcl->cl_chunks, struct svc_rdma_chunk,
+				ch_list);
+}
+
+/**
+ * pcl_next_chunk - Return next chunk in a parsed chunk list
+ * @pcl: a parsed chunk list
+ * @chunk: chunk in @pcl
+ *
+ * Returns the next chunk in the list, or NULL if @chunk is already last.
+ */
+static inline struct svc_rdma_chunk *
+pcl_next_chunk(const struct svc_rdma_pcl *pcl, struct svc_rdma_chunk *chunk)
+{
+	if (list_is_last(&chunk->ch_list, &pcl->cl_chunks))
+		return NULL;
+	return list_next_entry(chunk, ch_list);
+}
+
+/**
+ * pcl_for_each_chunk - Iterate over chunks in a parsed chunk list
+ * @pos: the loop cursor
+ * @pcl: a parsed chunk list
+ */
+#define pcl_for_each_chunk(pos, pcl) \
+	for (pos = list_first_entry(&(pcl)->cl_chunks, struct svc_rdma_chunk, ch_list); \
+	     &pos->ch_list != &(pcl)->cl_chunks; \
+	     pos = list_next_entry(pos, ch_list))
+
+/**
+ * pcl_for_each_segment - Iterate over segments in a parsed chunk
+ * @pos: the loop cursor
+ * @chunk: a parsed chunk
+ */
+#define pcl_for_each_segment(pos, chunk) \
+	for (pos = &(chunk)->ch_segments[0]; \
+	     pos <= &(chunk)->ch_segments[(chunk)->ch_segcount - 1]; \
+	     pos++)
+
+/**
+ * pcl_chunk_end_offset - Return offset of byte range following @chunk
+ * @chunk: chunk in @pcl
+ *
+ * Returns starting offset of the region just after @chunk
+ */
+static inline unsigned int
+pcl_chunk_end_offset(const struct svc_rdma_chunk *chunk)
+{
+	return xdr_align_size(chunk->ch_position + chunk->ch_payload_length);
+}
+
+struct svc_rdma_recv_ctxt;
+
+extern void pcl_free(struct svc_rdma_pcl *pcl);
+extern bool pcl_alloc_call(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
+extern bool pcl_alloc_read(struct svc_rdma_recv_ctxt *rctxt, __be32 *p);
+extern bool pcl_alloc_write(struct svc_rdma_recv_ctxt *rctxt,
+			    struct svc_rdma_pcl *pcl, __be32 *p);
+extern int pcl_process_nonpayloads(const struct svc_rdma_pcl *pcl,
+				   const struct xdr_buf *xdr,
+				   int (*actor)(const struct xdr_buf *,
+						void *),
+				   void *data);
+
+#endif	/* SVC_RDMA_PCL_H */
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
new file mode 100644
index 000000000..e882fe16a
--- /dev/null
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -0,0 +1,234 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svc_xprt.h
+ *
+ * RPC server transport I/O
+ */
+
+#ifndef SUNRPC_SVC_XPRT_H
+#define SUNRPC_SVC_XPRT_H
+
+#include <linux/sunrpc/svc.h>
+
+struct module;
+
+struct svc_xprt_ops {
+	struct svc_xprt	*(*xpo_create)(struct svc_serv *,
+				       struct net *net,
+				       struct sockaddr *, int,
+				       int);
+	struct svc_xprt	*(*xpo_accept)(struct svc_xprt *);
+	int		(*xpo_has_wspace)(struct svc_xprt *);
+	int		(*xpo_recvfrom)(struct svc_rqst *);
+	int		(*xpo_sendto)(struct svc_rqst *);
+	int		(*xpo_result_payload)(struct svc_rqst *, unsigned int,
+					      unsigned int);
+	void		(*xpo_release_ctxt)(struct svc_xprt *xprt, void *ctxt);
+	void		(*xpo_detach)(struct svc_xprt *);
+	void		(*xpo_free)(struct svc_xprt *);
+	void		(*xpo_secure_port)(struct svc_rqst *rqstp);
+	void		(*xpo_kill_temp_xprt)(struct svc_xprt *);
+	void		(*xpo_start_tls)(struct svc_xprt *);
+};
+
+struct svc_xprt_class {
+	const char		*xcl_name;
+	struct module		*xcl_owner;
+	const struct svc_xprt_ops *xcl_ops;
+	struct list_head	xcl_list;
+	u32			xcl_max_payload;
+	int			xcl_ident;
+};
+
+/*
+ * This is embedded in an object that wants a callback before deleting
+ * an xprt; intended for use by NFSv4.1, which needs to know when a
+ * client's tcp connection (and hence possibly a backchannel) goes away.
+ */
+struct svc_xpt_user {
+	struct list_head list;
+	void (*callback)(struct svc_xpt_user *);
+};
+
+struct svc_xprt {
+	struct svc_xprt_class	*xpt_class;
+	const struct svc_xprt_ops *xpt_ops;
+	struct kref		xpt_ref;
+	struct list_head	xpt_list;
+	struct list_head	xpt_ready;
+	unsigned long		xpt_flags;
+#define	XPT_BUSY	0		/* enqueued/receiving */
+#define	XPT_CONN	1		/* conn pending */
+#define	XPT_CLOSE	2		/* dead or dying */
+#define	XPT_DATA	3		/* data pending */
+#define	XPT_TEMP	4		/* connected transport */
+#define	XPT_DEAD	6		/* transport closed */
+#define	XPT_CHNGBUF	7		/* need to change snd/rcv buf sizes */
+#define	XPT_DEFERRED	8		/* deferred request pending */
+#define	XPT_OLD		9		/* used for xprt aging mark+sweep */
+#define XPT_LISTENER	10		/* listening endpoint */
+#define XPT_CACHE_AUTH	11		/* cache auth info */
+#define XPT_LOCAL	12		/* connection from loopback interface */
+#define XPT_KILL_TEMP   13		/* call xpo_kill_temp_xprt before closing */
+#define XPT_CONG_CTRL	14		/* has congestion control */
+
+	struct svc_serv		*xpt_server;	/* service for transport */
+	atomic_t    	    	xpt_reserved;	/* space on outq that is rsvd */
+	atomic_t		xpt_nr_rqsts;	/* Number of requests */
+	struct mutex		xpt_mutex;	/* to serialize sending data */
+	spinlock_t		xpt_lock;	/* protects sk_deferred
+						 * and xpt_auth_cache */
+	void			*xpt_auth_cache;/* auth cache */
+	struct list_head	xpt_deferred;	/* deferred requests that need
+						 * to be revisted */
+	struct sockaddr_storage	xpt_local;	/* local address */
+	size_t			xpt_locallen;	/* length of address */
+	struct sockaddr_storage	xpt_remote;	/* remote peer's address */
+	size_t			xpt_remotelen;	/* length of address */
+	char			xpt_remotebuf[INET6_ADDRSTRLEN + 10];
+	struct list_head	xpt_users;	/* callbacks on free */
+
+	struct net		*xpt_net;
+	netns_tracker		ns_tracker;
+	const struct cred	*xpt_cred;
+	struct rpc_xprt		*xpt_bc_xprt;	/* NFSv4.1 backchannel */
+	struct rpc_xprt_switch	*xpt_bc_xps;	/* NFSv4.1 backchannel */
+};
+
+static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
+{
+	spin_lock(&xpt->xpt_lock);
+	list_del_init(&u->list);
+	spin_unlock(&xpt->xpt_lock);
+}
+
+static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
+{
+	spin_lock(&xpt->xpt_lock);
+	if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
+		/*
+		 * The connection is about to be deleted soon (or,
+		 * worse, may already be deleted--in which case we've
+		 * already notified the xpt_users).
+		 */
+		spin_unlock(&xpt->xpt_lock);
+		return -ENOTCONN;
+	}
+	list_add(&u->list, &xpt->xpt_users);
+	spin_unlock(&xpt->xpt_lock);
+	return 0;
+}
+
+static inline bool svc_xprt_is_dead(const struct svc_xprt *xprt)
+{
+	return (test_bit(XPT_DEAD, &xprt->xpt_flags) != 0) ||
+		(test_bit(XPT_CLOSE, &xprt->xpt_flags) != 0);
+}
+
+int	svc_reg_xprt_class(struct svc_xprt_class *);
+void	svc_unreg_xprt_class(struct svc_xprt_class *);
+void	svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
+		      struct svc_serv *);
+int	svc_xprt_create(struct svc_serv *serv, const char *xprt_name,
+			struct net *net, const int family,
+			const unsigned short port, int flags,
+			const struct cred *cred);
+void	svc_xprt_destroy_all(struct svc_serv *serv, struct net *net);
+void	svc_xprt_received(struct svc_xprt *xprt);
+void	svc_xprt_enqueue(struct svc_xprt *xprt);
+void	svc_xprt_put(struct svc_xprt *xprt);
+void	svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
+void	svc_xprt_close(struct svc_xprt *xprt);
+int	svc_port_is_privileged(struct sockaddr *sin);
+int	svc_print_xprts(char *buf, int maxlen);
+struct	svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
+			struct net *net, const sa_family_t af,
+			const unsigned short port);
+int	svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
+void	svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
+void	svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
+void	svc_xprt_deferred_close(struct svc_xprt *xprt);
+
+static inline void svc_xprt_get(struct svc_xprt *xprt)
+{
+	kref_get(&xprt->xpt_ref);
+}
+static inline void svc_xprt_set_local(struct svc_xprt *xprt,
+				      const struct sockaddr *sa,
+				      const size_t salen)
+{
+	memcpy(&xprt->xpt_local, sa, salen);
+	xprt->xpt_locallen = salen;
+}
+static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
+				       const struct sockaddr *sa,
+				       const size_t salen)
+{
+	memcpy(&xprt->xpt_remote, sa, salen);
+	xprt->xpt_remotelen = salen;
+	snprintf(xprt->xpt_remotebuf, sizeof(xprt->xpt_remotebuf) - 1,
+		 "%pISpc", sa);
+}
+
+static inline unsigned short svc_addr_port(const struct sockaddr *sa)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
+
+	switch (sa->sa_family) {
+	case AF_INET:
+		return ntohs(sin->sin_port);
+	case AF_INET6:
+		return ntohs(sin6->sin6_port);
+	}
+
+	return 0;
+}
+
+static inline size_t svc_addr_len(const struct sockaddr *sa)
+{
+	switch (sa->sa_family) {
+	case AF_INET:
+		return sizeof(struct sockaddr_in);
+	case AF_INET6:
+		return sizeof(struct sockaddr_in6);
+	}
+	BUG();
+}
+
+static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
+{
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
+}
+
+static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
+{
+	return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
+}
+
+static inline char *__svc_print_addr(const struct sockaddr *addr,
+				     char *buf, const size_t len)
+{
+	const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
+	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
+
+	switch (addr->sa_family) {
+	case AF_INET:
+		snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
+			ntohs(sin->sin_port));
+		break;
+
+	case AF_INET6:
+		snprintf(buf, len, "%pI6, port=%u",
+			 &sin6->sin6_addr,
+			ntohs(sin6->sin6_port));
+		break;
+
+	default:
+		snprintf(buf, len, "unknown address type: %d", addr->sa_family);
+		break;
+	}
+
+	return buf;
+}
+#endif /* SUNRPC_SVC_XPRT_H */
diff --git a/include/linux/sunrpc/svcauth.h b/include/linux/sunrpc/svcauth.h
new file mode 100644
index 000000000..6d9cc9080
--- /dev/null
+++ b/include/linux/sunrpc/svcauth.h
@@ -0,0 +1,186 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svcauth.h
+ *
+ * RPC server-side authentication stuff.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_SVCAUTH_H_
+#define _LINUX_SUNRPC_SVCAUTH_H_
+
+#include <linux/string.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/cache.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/hash.h>
+#include <linux/stringhash.h>
+#include <linux/cred.h>
+
+struct svc_cred {
+	kuid_t			cr_uid;
+	kgid_t			cr_gid;
+	struct group_info	*cr_group_info;
+	u32			cr_flavor; /* pseudoflavor */
+	/* name of form servicetype/hostname@REALM, passed down by
+	 * gss-proxy: */
+	char			*cr_raw_principal;
+	/* name of form servicetype@hostname, passed down by
+	 * rpc.svcgssd, or computed from the above: */
+	char			*cr_principal;
+	char			*cr_targ_princ;
+	struct gss_api_mech	*cr_gss_mech;
+};
+
+static inline void init_svc_cred(struct svc_cred *cred)
+{
+	cred->cr_group_info = NULL;
+	cred->cr_raw_principal = NULL;
+	cred->cr_principal = NULL;
+	cred->cr_targ_princ = NULL;
+	cred->cr_gss_mech = NULL;
+}
+
+static inline void free_svc_cred(struct svc_cred *cred)
+{
+	if (cred->cr_group_info)
+		put_group_info(cred->cr_group_info);
+	kfree(cred->cr_raw_principal);
+	kfree(cred->cr_principal);
+	kfree(cred->cr_targ_princ);
+	gss_mech_put(cred->cr_gss_mech);
+	init_svc_cred(cred);
+}
+
+struct svc_rqst;		/* forward decl */
+struct in6_addr;
+
+/* Authentication is done in the context of a domain.
+ *
+ * Currently, the nfs server uses the auth_domain to stand
+ * for the "client" listed in /etc/exports.
+ *
+ * More generally, a domain might represent a group of clients using
+ * a common mechanism for authentication and having a common mapping
+ * between local identity (uid) and network identity.  All clients
+ * in a domain have similar general access rights.  Each domain can
+ * contain multiple principals which will have different specific right
+ * based on normal Discretionary Access Control.
+ *
+ * A domain is created by an authentication flavour module based on name
+ * only.  Userspace then fills in detail on demand.
+ *
+ * In the case of auth_unix and auth_null, the auth_domain is also
+ * associated with entries in another cache representing the mapping
+ * of ip addresses to the given client.
+ */
+struct auth_domain {
+	struct kref		ref;
+	struct hlist_node	hash;
+	char			*name;
+	struct auth_ops		*flavour;
+	struct rcu_head		rcu_head;
+};
+
+/*
+ * Each authentication flavour registers an auth_ops
+ * structure.
+ * name is simply the name.
+ * flavour gives the auth flavour. It determines where the flavour is registered
+ * accept() is given a request and should verify it.
+ *   It should inspect the authenticator and verifier, and possibly the data.
+ *    If there is a problem with the authentication *authp should be set.
+ *    The return value of accept() can indicate:
+ *      OK - authorised. client and credential are set in rqstp.
+ *           reqbuf points to arguments
+ *           resbuf points to good place for results.  verfier
+ *             is (probably) already in place.  Certainly space is
+ *	       reserved for it.
+ *      DROP - simply drop the request. It may have been deferred
+ *      GARBAGE - rpc garbage_args error
+ *      SYSERR - rpc system_err error
+ *      DENIED - authp holds reason for denial.
+ *      COMPLETE - the reply is encoded already and ready to be sent; no
+ *		further processing is necessary.  (This is used for processing
+ *		null procedure calls which are used to set up encryption
+ *		contexts.)
+ *
+ *   accept is passed the proc number so that it can accept NULL rpc requests
+ *   even if it cannot authenticate the client (as is sometimes appropriate).
+ *
+ * release() is given a request after the procedure has been run.
+ *  It should sign/encrypt the results if needed
+ * It should return:
+ *    OK - the resbuf is ready to be sent
+ *    DROP - the reply should be quitely dropped
+ *    DENIED - authp holds a reason for MSG_DENIED
+ *    SYSERR - rpc system_err
+ *
+ * domain_release()
+ *   This call releases a domain.
+ * set_client()
+ *   Givens a pending request (struct svc_rqst), finds and assigns
+ *   an appropriate 'auth_domain' as the client.
+ */
+struct auth_ops {
+	char *	name;
+	struct module *owner;
+	int	flavour;
+	int	(*accept)(struct svc_rqst *rq);
+	int	(*release)(struct svc_rqst *rq);
+	void	(*domain_release)(struct auth_domain *);
+	int	(*set_client)(struct svc_rqst *rq);
+};
+
+#define	SVC_GARBAGE	1
+#define	SVC_SYSERR	2
+#define	SVC_VALID	3
+#define	SVC_NEGATIVE	4
+#define	SVC_OK		5
+#define	SVC_DROP	6
+#define	SVC_CLOSE	7	/* Like SVC_DROP, but request is definitely
+				 * lost so if there is a tcp connection, it
+				 * should be closed
+				 */
+#define	SVC_DENIED	8
+#define	SVC_PENDING	9
+#define	SVC_COMPLETE	10
+
+struct svc_xprt;
+
+extern int	svc_authenticate(struct svc_rqst *rqstp);
+extern int	svc_authorise(struct svc_rqst *rqstp);
+extern int	svc_set_client(struct svc_rqst *rqstp);
+extern int	svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops);
+extern void	svc_auth_unregister(rpc_authflavor_t flavor);
+
+extern struct auth_domain *unix_domain_find(char *name);
+extern void auth_domain_put(struct auth_domain *item);
+extern int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom);
+extern struct auth_domain *auth_domain_lookup(char *name, struct auth_domain *new);
+extern struct auth_domain *auth_domain_find(char *name);
+extern struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr);
+extern int auth_unix_forget_old(struct auth_domain *dom);
+extern void svcauth_unix_purge(struct net *net);
+extern void svcauth_unix_info_release(struct svc_xprt *xpt);
+extern int svcauth_unix_set_client(struct svc_rqst *rqstp);
+
+extern int unix_gid_cache_create(struct net *net);
+extern void unix_gid_cache_destroy(struct net *net);
+
+/*
+ * The <stringhash.h> functions are good enough that we don't need to
+ * use hash_32() on them; just extracting the high bits is enough.
+ */
+static inline unsigned long hash_str(char const *name, int bits)
+{
+	return hashlen_hash(hashlen_string(NULL, name)) >> (32 - bits);
+}
+
+static inline unsigned long hash_mem(char const *buf, int length, int bits)
+{
+	return full_name_hash(NULL, buf, length) >> (32 - bits);
+}
+
+#endif /* _LINUX_SUNRPC_SVCAUTH_H_ */
diff --git a/include/linux/sunrpc/svcauth_gss.h b/include/linux/sunrpc/svcauth_gss.h
new file mode 100644
index 000000000..f09c82b0a
--- /dev/null
+++ b/include/linux/sunrpc/svcauth_gss.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svcauth_gss.h
+ *
+ * Bruce Fields <bfields@umich.edu>
+ * Copyright (c) 2002 The Regents of the University of Michigan
+ */
+
+#ifndef _LINUX_SUNRPC_SVCAUTH_GSS_H
+#define _LINUX_SUNRPC_SVCAUTH_GSS_H
+
+#include <linux/sched.h>
+#include <linux/sunrpc/types.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/sunrpc/svcsock.h>
+#include <linux/sunrpc/auth_gss.h>
+
+int gss_svc_init(void);
+void gss_svc_shutdown(void);
+int gss_svc_init_net(struct net *net);
+void gss_svc_shutdown_net(struct net *net);
+struct auth_domain *svcauth_gss_register_pseudoflavor(u32 pseudoflavor,
+						      char *name);
+u32 svcauth_gss_flavor(struct auth_domain *dom);
+
+#endif /* _LINUX_SUNRPC_SVCAUTH_GSS_H */
diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
new file mode 100644
index 000000000..13aff355d
--- /dev/null
+++ b/include/linux/sunrpc/svcsock.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/svcsock.h
+ *
+ * RPC server socket I/O.
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef SUNRPC_SVCSOCK_H
+#define SUNRPC_SVCSOCK_H
+
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svc_xprt.h>
+
+/*
+ * RPC server socket.
+ */
+struct svc_sock {
+	struct svc_xprt		sk_xprt;
+	struct socket *		sk_sock;	/* berkeley socket layer */
+	struct sock *		sk_sk;		/* INET layer */
+
+	/* We keep the old state_change and data_ready CB's here */
+	void			(*sk_ostate)(struct sock *);
+	void			(*sk_odata)(struct sock *);
+	void			(*sk_owspace)(struct sock *);
+
+	/* private TCP part */
+	/* On-the-wire fragment header: */
+	__be32			sk_marker;
+	/* As we receive a record, this includes the length received so
+	 * far (including the fragment header): */
+	u32			sk_tcplen;
+	/* Total length of the data (not including fragment headers)
+	 * received so far in the fragments making up this rpc: */
+	u32			sk_datalen;
+	/* Number of queued send requests */
+	atomic_t		sk_sendqlen;
+
+	struct page *		sk_pages[RPCSVC_MAXPAGES];	/* received data */
+};
+
+static inline u32 svc_sock_reclen(struct svc_sock *svsk)
+{
+	return be32_to_cpu(svsk->sk_marker) & RPC_FRAGMENT_SIZE_MASK;
+}
+
+static inline u32 svc_sock_final_rec(struct svc_sock *svsk)
+{
+	return be32_to_cpu(svsk->sk_marker) & RPC_LAST_STREAM_FRAGMENT;
+}
+
+/*
+ * Function prototypes.
+ */
+void		svc_close_net(struct svc_serv *, struct net *);
+int		svc_recv(struct svc_rqst *, long);
+int		svc_send(struct svc_rqst *);
+void		svc_drop(struct svc_rqst *);
+void		svc_sock_update_bufs(struct svc_serv *serv);
+int		svc_addsock(struct svc_serv *serv, struct net *net,
+			    const int fd, char *name_return, const size_t len,
+			    const struct cred *cred);
+void		svc_init_xprt_sock(void);
+void		svc_cleanup_xprt_sock(void);
+struct svc_xprt *svc_sock_create(struct svc_serv *serv, int prot);
+void		svc_sock_destroy(struct svc_xprt *);
+
+/*
+ * svc_makesock socket characteristics
+ */
+#define SVC_SOCK_DEFAULTS	(0U)
+#define SVC_SOCK_ANONYMOUS	(1U << 0)	/* don't register with pmap */
+#define SVC_SOCK_TEMPORARY	(1U << 1)	/* flag socket as temporary */
+
+#endif /* SUNRPC_SVCSOCK_H */
diff --git a/include/linux/sunrpc/timer.h b/include/linux/sunrpc/timer.h
new file mode 100644
index 000000000..242dbe00b
--- /dev/null
+++ b/include/linux/sunrpc/timer.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/include/linux/sunrpc/timer.h
+ *
+ *  Declarations for the RPC transport timer.
+ *
+ *  Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
+ */
+
+#ifndef _LINUX_SUNRPC_TIMER_H
+#define _LINUX_SUNRPC_TIMER_H
+
+#include <linux/atomic.h>
+
+struct rpc_rtt {
+	unsigned long timeo;	/* default timeout value */
+	unsigned long srtt[5];	/* smoothed round trip time << 3 */
+	unsigned long sdrtt[5];	/* smoothed medium deviation of RTT */
+	int ntimeouts[5];	/* Number of timeouts for the last request */
+};
+
+
+extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
+extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
+extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);
+
+static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo)
+{
+	int *t;
+	if (!timer)
+		return;
+	t = &rt->ntimeouts[timer-1];
+	if (ntimeo < *t) {
+		if (*t > 0)
+			(*t)--;
+	} else {
+		if (ntimeo > 8)
+			ntimeo = 8;
+		*t = ntimeo;
+	}
+}
+
+static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer)
+{
+	if (!timer)
+		return 0;
+	return rt->ntimeouts[timer-1];
+}
+
+#endif /* _LINUX_SUNRPC_TIMER_H */
diff --git a/include/linux/sunrpc/types.h b/include/linux/sunrpc/types.h
new file mode 100644
index 000000000..bd3c8e056
--- /dev/null
+++ b/include/linux/sunrpc/types.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/types.h
+ *
+ * Generic types and misc stuff for RPC.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_TYPES_H_
+#define _LINUX_SUNRPC_TYPES_H_
+
+#include <linux/timer.h>
+#include <linux/sched/signal.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/debug.h>
+#include <linux/list.h>
+
+/*
+ * Shorthands
+ */
+#define signalled()		(signal_pending(current))
+
+#endif /* _LINUX_SUNRPC_TYPES_H_ */
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
new file mode 100644
index 000000000..f84e2a135
--- /dev/null
+++ b/include/linux/sunrpc/xdr.h
@@ -0,0 +1,772 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * XDR standard data types and function declarations
+ *
+ * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
+ *
+ * Based on:
+ *   RFC 4506 "XDR: External Data Representation Standard", May 2006
+ */
+
+#ifndef _SUNRPC_XDR_H_
+#define _SUNRPC_XDR_H_
+
+#include <linux/uio.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+#include <linux/scatterlist.h>
+
+struct bio_vec;
+struct rpc_rqst;
+
+/*
+ * Size of an XDR encoding unit in bytes, i.e. 32 bits,
+ * as defined in Section 3 of RFC 4506. All encoded
+ * XDR data items are aligned on a boundary of 32 bits.
+ */
+#define XDR_UNIT		sizeof(__be32)
+
+/*
+ * Buffer adjustment
+ */
+#define XDR_QUADLEN(l)		(((l) + 3) >> 2)
+
+/*
+ * Generic opaque `network object.'
+ */
+#define XDR_MAX_NETOBJ		1024
+struct xdr_netobj {
+	unsigned int		len;
+	u8 *			data;
+};
+
+/*
+ * Basic structure for transmission/reception of a client XDR message.
+ * Features a header (for a linear buffer containing RPC headers
+ * and the data payload for short messages), and then an array of
+ * pages.
+ * The tail iovec allows you to append data after the page array. Its
+ * main interest is for appending padding to the pages in order to
+ * satisfy the int_32-alignment requirements in RFC1832.
+ *
+ * For the future, we might want to string several of these together
+ * in a list if anybody wants to make use of NFSv4 COMPOUND
+ * operations and/or has a need for scatter/gather involving pages.
+ */
+struct xdr_buf {
+	struct kvec	head[1],	/* RPC header + non-page data */
+			tail[1];	/* Appended after page data */
+
+	struct bio_vec	*bvec;
+	struct page **	pages;		/* Array of pages */
+	unsigned int	page_base,	/* Start of page data */
+			page_len,	/* Length of page data */
+			flags;		/* Flags for data disposition */
+#define XDRBUF_READ		0x01		/* target of file read */
+#define XDRBUF_WRITE		0x02		/* source of file write */
+#define XDRBUF_SPARSE_PAGES	0x04		/* Page array is sparse */
+
+	unsigned int	buflen,		/* Total length of storage buffer */
+			len;		/* Length of XDR encoded message */
+};
+
+static inline void
+xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
+{
+	buf->head[0].iov_base = start;
+	buf->head[0].iov_len = len;
+	buf->tail[0].iov_len = 0;
+	buf->pages = NULL;
+	buf->page_len = 0;
+	buf->flags = 0;
+	buf->len = 0;
+	buf->buflen = len;
+}
+
+/*
+ * pre-xdr'ed macros.
+ */
+
+#define	xdr_zero	cpu_to_be32(0)
+#define	xdr_one		cpu_to_be32(1)
+#define	xdr_two		cpu_to_be32(2)
+
+#define	rpc_auth_null	cpu_to_be32(RPC_AUTH_NULL)
+#define	rpc_auth_unix	cpu_to_be32(RPC_AUTH_UNIX)
+#define	rpc_auth_short	cpu_to_be32(RPC_AUTH_SHORT)
+#define	rpc_auth_gss	cpu_to_be32(RPC_AUTH_GSS)
+#define	rpc_auth_tls	cpu_to_be32(RPC_AUTH_TLS)
+
+#define	rpc_call	cpu_to_be32(RPC_CALL)
+#define	rpc_reply	cpu_to_be32(RPC_REPLY)
+
+#define	rpc_msg_accepted	cpu_to_be32(RPC_MSG_ACCEPTED)
+
+#define	rpc_success		cpu_to_be32(RPC_SUCCESS)
+#define	rpc_prog_unavail	cpu_to_be32(RPC_PROG_UNAVAIL)
+#define	rpc_prog_mismatch	cpu_to_be32(RPC_PROG_MISMATCH)
+#define	rpc_proc_unavail	cpu_to_be32(RPC_PROC_UNAVAIL)
+#define	rpc_garbage_args	cpu_to_be32(RPC_GARBAGE_ARGS)
+#define	rpc_system_err		cpu_to_be32(RPC_SYSTEM_ERR)
+#define	rpc_drop_reply		cpu_to_be32(RPC_DROP_REPLY)
+
+#define	rpc_mismatch		cpu_to_be32(RPC_MISMATCH)
+#define	rpc_auth_error		cpu_to_be32(RPC_AUTH_ERROR)
+
+#define	rpc_auth_ok		cpu_to_be32(RPC_AUTH_OK)
+#define	rpc_autherr_badcred	cpu_to_be32(RPC_AUTH_BADCRED)
+#define	rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
+#define	rpc_autherr_badverf	cpu_to_be32(RPC_AUTH_BADVERF)
+#define	rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
+#define	rpc_autherr_tooweak	cpu_to_be32(RPC_AUTH_TOOWEAK)
+#define	rpcsec_gsserr_credproblem	cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
+#define	rpcsec_gsserr_ctxproblem	cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
+
+/*
+ * Miscellaneous XDR helper functions
+ */
+__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
+__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
+__be32 *xdr_encode_string(__be32 *p, const char *s);
+__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
+			unsigned int maxlen);
+__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
+__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
+
+void	xdr_inline_pages(struct xdr_buf *, unsigned int,
+			 struct page **, unsigned int, unsigned int);
+void	xdr_terminate_string(const struct xdr_buf *, const u32);
+size_t	xdr_buf_pagecount(const struct xdr_buf *buf);
+int	xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
+void	xdr_free_bvec(struct xdr_buf *buf);
+
+static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
+{
+	return xdr_encode_opaque(p, s, len);
+}
+
+/*
+ * Decode 64bit quantities (NFSv3 support)
+ */
+static inline __be32 *
+xdr_encode_hyper(__be32 *p, __u64 val)
+{
+	put_unaligned_be64(val, p);
+	return p + 2;
+}
+
+static inline __be32 *
+xdr_decode_hyper(__be32 *p, __u64 *valp)
+{
+	*valp = get_unaligned_be64(p);
+	return p + 2;
+}
+
+static inline __be32 *
+xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
+{
+	memcpy(ptr, p, len);
+	return p + XDR_QUADLEN(len);
+}
+
+static inline void xdr_netobj_dup(struct xdr_netobj *dst,
+				  struct xdr_netobj *src, gfp_t gfp_mask)
+{
+	dst->data = kmemdup(src->data, src->len, gfp_mask);
+	dst->len = src->len;
+}
+
+/*
+ * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
+ */
+static inline int
+xdr_adjust_iovec(struct kvec *iov, __be32 *p)
+{
+	return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
+}
+
+/*
+ * XDR buffer helper functions
+ */
+extern void xdr_shift_buf(struct xdr_buf *, size_t);
+extern void xdr_buf_from_iov(const struct kvec *, struct xdr_buf *);
+extern int xdr_buf_subsegment(const struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
+extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
+extern int read_bytes_from_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int);
+extern int write_bytes_to_xdr_buf(const struct xdr_buf *, unsigned int, void *, unsigned int);
+
+extern int xdr_encode_word(const struct xdr_buf *, unsigned int, u32);
+extern int xdr_decode_word(const struct xdr_buf *, unsigned int, u32 *);
+
+struct xdr_array2_desc;
+typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
+struct xdr_array2_desc {
+	unsigned int elem_size;
+	unsigned int array_len;
+	unsigned int array_maxlen;
+	xdr_xcode_elem_t xcode;
+};
+
+extern int xdr_decode_array2(const struct xdr_buf *buf, unsigned int base,
+			     struct xdr_array2_desc *desc);
+extern int xdr_encode_array2(const struct xdr_buf *buf, unsigned int base,
+			     struct xdr_array2_desc *desc);
+extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
+			     size_t len);
+
+/*
+ * Provide some simple tools for XDR buffer overflow-checking etc.
+ */
+struct xdr_stream {
+	__be32 *p;		/* start of available buffer */
+	struct xdr_buf *buf;	/* XDR buffer to read/write */
+
+	__be32 *end;		/* end of available buffer space */
+	struct kvec *iov;	/* pointer to the current kvec */
+	struct kvec scratch;	/* Scratch buffer */
+	struct page **page_ptr;	/* pointer to the current page */
+	unsigned int nwords;	/* Remaining decode buffer length */
+
+	struct rpc_rqst *rqst;	/* For debugging */
+};
+
+/*
+ * These are the xdr_stream style generic XDR encode and decode functions.
+ */
+typedef void	(*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
+		const void *obj);
+typedef int	(*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
+		void *obj);
+
+extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
+			    __be32 *p, struct rpc_rqst *rqst);
+extern void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+			   struct page **pages, struct rpc_rqst *rqst);
+extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
+extern int xdr_reserve_space_vec(struct xdr_stream *xdr, struct kvec *vec,
+		size_t nbytes);
+extern void __xdr_commit_encode(struct xdr_stream *xdr);
+extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
+extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
+extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
+		unsigned int base, unsigned int len);
+extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
+extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);
+extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
+			    __be32 *p, struct rpc_rqst *rqst);
+extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+		struct page **pages, unsigned int len);
+extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
+extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
+extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
+extern int xdr_process_buf(const struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
+extern void xdr_set_pagelen(struct xdr_stream *, unsigned int len);
+extern bool xdr_stream_subsegment(struct xdr_stream *xdr, struct xdr_buf *subbuf,
+				  unsigned int len);
+extern unsigned int xdr_stream_move_subsegment(struct xdr_stream *xdr, unsigned int offset,
+					       unsigned int target, unsigned int length);
+extern unsigned int xdr_stream_zero(struct xdr_stream *xdr, unsigned int offset,
+				    unsigned int length);
+
+/**
+ * xdr_set_scratch_buffer - Attach a scratch buffer for decoding data.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to an empty buffer
+ * @buflen: size of 'buf'
+ *
+ * The scratch buffer is used when decoding from an array of pages.
+ * If an xdr_inline_decode() call spans across page boundaries, then
+ * we copy the data into the scratch buffer in order to allow linear
+ * access.
+ */
+static inline void
+xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen)
+{
+	xdr->scratch.iov_base = buf;
+	xdr->scratch.iov_len = buflen;
+}
+
+/**
+ * xdr_set_scratch_page - Attach a scratch buffer for decoding data
+ * @xdr: pointer to xdr_stream struct
+ * @page: an anonymous page
+ *
+ * See xdr_set_scratch_buffer().
+ */
+static inline void
+xdr_set_scratch_page(struct xdr_stream *xdr, struct page *page)
+{
+	xdr_set_scratch_buffer(xdr, page_address(page), PAGE_SIZE);
+}
+
+/**
+ * xdr_reset_scratch_buffer - Clear scratch buffer information
+ * @xdr: pointer to xdr_stream struct
+ *
+ * See xdr_set_scratch_buffer().
+ */
+static inline void
+xdr_reset_scratch_buffer(struct xdr_stream *xdr)
+{
+	xdr_set_scratch_buffer(xdr, NULL, 0);
+}
+
+/**
+ * xdr_commit_encode - Ensure all data is written to xdr->buf
+ * @xdr: pointer to xdr_stream
+ *
+ * Handle encoding across page boundaries by giving the caller a
+ * temporary location to write to, then later copying the data into
+ * place. __xdr_commit_encode() does that copying.
+ */
+static inline void xdr_commit_encode(struct xdr_stream *xdr)
+{
+	if (unlikely(xdr->scratch.iov_len))
+		__xdr_commit_encode(xdr);
+}
+
+/**
+ * xdr_stream_remaining - Return the number of bytes remaining in the stream
+ * @xdr: pointer to struct xdr_stream
+ *
+ * Return value:
+ *   Number of bytes remaining in @xdr before xdr->end
+ */
+static inline size_t
+xdr_stream_remaining(const struct xdr_stream *xdr)
+{
+	return xdr->nwords << 2;
+}
+
+ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
+		size_t size);
+ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
+		size_t maxlen, gfp_t gfp_flags);
+ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
+		size_t size);
+ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
+		size_t maxlen, gfp_t gfp_flags);
+/**
+ * xdr_align_size - Calculate padded size of an object
+ * @n: Size of an object being XDR encoded (in bytes)
+ *
+ * Return value:
+ *   Size (in bytes) of the object including xdr padding
+ */
+static inline size_t
+xdr_align_size(size_t n)
+{
+	const size_t mask = XDR_UNIT - 1;
+
+	return (n + mask) & ~mask;
+}
+
+/**
+ * xdr_pad_size - Calculate size of an object's pad
+ * @n: Size of an object being XDR encoded (in bytes)
+ *
+ * This implementation avoids the need for conditional
+ * branches or modulo division.
+ *
+ * Return value:
+ *   Size (in bytes) of the needed XDR pad
+ */
+static inline size_t xdr_pad_size(size_t n)
+{
+	return xdr_align_size(n) - n;
+}
+
+/**
+ * xdr_stream_encode_item_present - Encode a "present" list item
+ * @xdr: pointer to xdr_stream
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t xdr_stream_encode_item_present(struct xdr_stream *xdr)
+{
+	const size_t len = XDR_UNIT;
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	*p = xdr_one;
+	return len;
+}
+
+/**
+ * xdr_stream_encode_item_absent - Encode a "not present" list item
+ * @xdr: pointer to xdr_stream
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline int xdr_stream_encode_item_absent(struct xdr_stream *xdr)
+{
+	const size_t len = XDR_UNIT;
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	*p = xdr_zero;
+	return len;
+}
+
+/**
+ * xdr_encode_bool - Encode a boolean item
+ * @p: address in a buffer into which to encode
+ * @n: boolean value to encode
+ *
+ * Return value:
+ *   Address of item following the encoded boolean
+ */
+static inline __be32 *xdr_encode_bool(__be32 *p, u32 n)
+{
+	*p++ = n ? xdr_one : xdr_zero;
+	return p;
+}
+
+/**
+ * xdr_stream_encode_bool - Encode a boolean item
+ * @xdr: pointer to xdr_stream
+ * @n: boolean value to encode
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline int xdr_stream_encode_bool(struct xdr_stream *xdr, __u32 n)
+{
+	const size_t len = XDR_UNIT;
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	xdr_encode_bool(p, n);
+	return len;
+}
+
+/**
+ * xdr_stream_encode_u32 - Encode a 32-bit integer
+ * @xdr: pointer to xdr_stream
+ * @n: integer to encode
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
+{
+	const size_t len = sizeof(n);
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	*p = cpu_to_be32(n);
+	return len;
+}
+
+/**
+ * xdr_stream_encode_u64 - Encode a 64-bit integer
+ * @xdr: pointer to xdr_stream
+ * @n: 64-bit integer to encode
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
+{
+	const size_t len = sizeof(n);
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	xdr_encode_hyper(p, n);
+	return len;
+}
+
+/**
+ * xdr_stream_encode_opaque_inline - Encode opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to void pointer
+ * @len: size of object
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
+{
+	size_t count = sizeof(__u32) + xdr_align_size(len);
+	__be32 *p = xdr_reserve_space(xdr, count);
+
+	if (unlikely(!p)) {
+		*ptr = NULL;
+		return -EMSGSIZE;
+	}
+	xdr_encode_opaque(p, NULL, len);
+	*ptr = ++p;
+	return count;
+}
+
+/**
+ * xdr_stream_encode_opaque_fixed - Encode fixed length opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to opaque data object
+ * @len: size of object pointed to by @ptr
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
+{
+	__be32 *p = xdr_reserve_space(xdr, len);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	xdr_encode_opaque_fixed(p, ptr, len);
+	return xdr_align_size(len);
+}
+
+/**
+ * xdr_stream_encode_opaque - Encode variable length opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to opaque data object
+ * @len: size of object pointed to by @ptr
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
+{
+	size_t count = sizeof(__u32) + xdr_align_size(len);
+	__be32 *p = xdr_reserve_space(xdr, count);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	xdr_encode_opaque(p, ptr, len);
+	return count;
+}
+
+/**
+ * xdr_stream_encode_uint32_array - Encode variable length array of integers
+ * @xdr: pointer to xdr_stream
+ * @array: array of integers
+ * @array_size: number of elements in @array
+ *
+ * Return values:
+ *   On success, returns length in bytes of XDR buffer consumed
+ *   %-EMSGSIZE on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
+		const __u32 *array, size_t array_size)
+{
+	ssize_t ret = (array_size+1) * sizeof(__u32);
+	__be32 *p = xdr_reserve_space(xdr, ret);
+
+	if (unlikely(!p))
+		return -EMSGSIZE;
+	*p++ = cpu_to_be32(array_size);
+	for (; array_size > 0; p++, array++, array_size--)
+		*p = cpu_to_be32p(array);
+	return ret;
+}
+
+/**
+ * xdr_item_is_absent - symbolically handle XDR discriminators
+ * @p: pointer to undecoded discriminator
+ *
+ * Return values:
+ *   %true if the following XDR item is absent
+ *   %false if the following XDR item is present
+ */
+static inline bool xdr_item_is_absent(const __be32 *p)
+{
+	return *p == xdr_zero;
+}
+
+/**
+ * xdr_item_is_present - symbolically handle XDR discriminators
+ * @p: pointer to undecoded discriminator
+ *
+ * Return values:
+ *   %true if the following XDR item is present
+ *   %false if the following XDR item is absent
+ */
+static inline bool xdr_item_is_present(const __be32 *p)
+{
+	return *p != xdr_zero;
+}
+
+/**
+ * xdr_stream_decode_bool - Decode a boolean
+ * @xdr: pointer to xdr_stream
+ * @ptr: pointer to a u32 in which to store the result
+ *
+ * Return values:
+ *   %0 on success
+ *   %-EBADMSG on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_decode_bool(struct xdr_stream *xdr, __u32 *ptr)
+{
+	const size_t count = sizeof(*ptr);
+	__be32 *p = xdr_inline_decode(xdr, count);
+
+	if (unlikely(!p))
+		return -EBADMSG;
+	*ptr = (*p != xdr_zero);
+	return 0;
+}
+
+/**
+ * xdr_stream_decode_u32 - Decode a 32-bit integer
+ * @xdr: pointer to xdr_stream
+ * @ptr: location to store integer
+ *
+ * Return values:
+ *   %0 on success
+ *   %-EBADMSG on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
+{
+	const size_t count = sizeof(*ptr);
+	__be32 *p = xdr_inline_decode(xdr, count);
+
+	if (unlikely(!p))
+		return -EBADMSG;
+	*ptr = be32_to_cpup(p);
+	return 0;
+}
+
+/**
+ * xdr_stream_decode_u64 - Decode a 64-bit integer
+ * @xdr: pointer to xdr_stream
+ * @ptr: location to store 64-bit integer
+ *
+ * Return values:
+ *   %0 on success
+ *   %-EBADMSG on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_decode_u64(struct xdr_stream *xdr, __u64 *ptr)
+{
+	const size_t count = sizeof(*ptr);
+	__be32 *p = xdr_inline_decode(xdr, count);
+
+	if (unlikely(!p))
+		return -EBADMSG;
+	xdr_decode_hyper(p, ptr);
+	return 0;
+}
+
+/**
+ * xdr_stream_decode_opaque_fixed - Decode fixed length opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: location to store data
+ * @len: size of buffer pointed to by @ptr
+ *
+ * Return values:
+ *   On success, returns size of object stored in @ptr
+ *   %-EBADMSG on XDR buffer overflow
+ */
+static inline ssize_t
+xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
+{
+	__be32 *p = xdr_inline_decode(xdr, len);
+
+	if (unlikely(!p))
+		return -EBADMSG;
+	xdr_decode_opaque_fixed(p, ptr, len);
+	return len;
+}
+
+/**
+ * xdr_stream_decode_opaque_inline - Decode variable length opaque xdr data
+ * @xdr: pointer to xdr_stream
+ * @ptr: location to store pointer to opaque data
+ * @maxlen: maximum acceptable object size
+ *
+ * Note: the pointer stored in @ptr cannot be assumed valid after the XDR
+ * buffer has been destroyed, or even after calling xdr_inline_decode()
+ * on @xdr. It is therefore expected that the object it points to should
+ * be processed immediately.
+ *
+ * Return values:
+ *   On success, returns size of object stored in *@ptr
+ *   %-EBADMSG on XDR buffer overflow
+ *   %-EMSGSIZE if the size of the object would exceed @maxlen
+ */
+static inline ssize_t
+xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
+{
+	__be32 *p;
+	__u32 len;
+
+	*ptr = NULL;
+	if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
+		return -EBADMSG;
+	if (len != 0) {
+		p = xdr_inline_decode(xdr, len);
+		if (unlikely(!p))
+			return -EBADMSG;
+		if (unlikely(len > maxlen))
+			return -EMSGSIZE;
+		*ptr = p;
+	}
+	return len;
+}
+
+/**
+ * xdr_stream_decode_uint32_array - Decode variable length array of integers
+ * @xdr: pointer to xdr_stream
+ * @array: location to store the integer array or NULL
+ * @array_size: number of elements to store
+ *
+ * Return values:
+ *   On success, returns number of elements stored in @array
+ *   %-EBADMSG on XDR buffer overflow
+ *   %-EMSGSIZE if the size of the array exceeds @array_size
+ */
+static inline ssize_t
+xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
+		__u32 *array, size_t array_size)
+{
+	__be32 *p;
+	__u32 len;
+	ssize_t retval;
+
+	if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
+		return -EBADMSG;
+	if (len > SIZE_MAX / sizeof(*p))
+		return -EBADMSG;
+	p = xdr_inline_decode(xdr, len * sizeof(*p));
+	if (unlikely(!p))
+		return -EBADMSG;
+	if (array == NULL)
+		return len;
+	if (len <= array_size) {
+		if (len < array_size)
+			memset(array+len, 0, (array_size-len)*sizeof(*array));
+		array_size = len;
+		retval = len;
+	} else
+		retval = -EMSGSIZE;
+	for (; array_size > 0; p++, array++, array_size--)
+		*array = be32_to_cpup(p);
+	return retval;
+}
+
+#endif /* _SUNRPC_XDR_H_ */
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
new file mode 100644
index 000000000..b9f59aabe
--- /dev/null
+++ b/include/linux/sunrpc/xprt.h
@@ -0,0 +1,512 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/include/linux/sunrpc/xprt.h
+ *
+ *  Declarations for the RPC transport interface.
+ *
+ *  Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_XPRT_H
+#define _LINUX_SUNRPC_XPRT_H
+
+#include <linux/uio.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/ktime.h>
+#include <linux/kref.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/msg_prot.h>
+
+#define RPC_MIN_SLOT_TABLE	(2U)
+#define RPC_DEF_SLOT_TABLE	(16U)
+#define RPC_MAX_SLOT_TABLE_LIMIT	(65536U)
+#define RPC_MAX_SLOT_TABLE	RPC_MAX_SLOT_TABLE_LIMIT
+
+#define RPC_CWNDSHIFT		(8U)
+#define RPC_CWNDSCALE		(1U << RPC_CWNDSHIFT)
+#define RPC_INITCWND		RPC_CWNDSCALE
+#define RPC_MAXCWND(xprt)	((xprt)->max_reqs << RPC_CWNDSHIFT)
+#define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
+
+/*
+ * This describes a timeout strategy
+ */
+struct rpc_timeout {
+	unsigned long		to_initval,		/* initial timeout */
+				to_maxval,		/* max timeout */
+				to_increment;		/* if !exponential */
+	unsigned int		to_retries;		/* max # of retries */
+	unsigned char		to_exponential;
+};
+
+enum rpc_display_format_t {
+	RPC_DISPLAY_ADDR = 0,
+	RPC_DISPLAY_PORT,
+	RPC_DISPLAY_PROTO,
+	RPC_DISPLAY_HEX_ADDR,
+	RPC_DISPLAY_HEX_PORT,
+	RPC_DISPLAY_NETID,
+	RPC_DISPLAY_MAX,
+};
+
+struct rpc_task;
+struct rpc_xprt;
+struct xprt_class;
+struct seq_file;
+struct svc_serv;
+struct net;
+
+/*
+ * This describes a complete RPC request
+ */
+struct rpc_rqst {
+	/*
+	 * This is the user-visible part
+	 */
+	struct rpc_xprt *	rq_xprt;		/* RPC client */
+	struct xdr_buf		rq_snd_buf;		/* send buffer */
+	struct xdr_buf		rq_rcv_buf;		/* recv buffer */
+
+	/*
+	 * This is the private part
+	 */
+	struct rpc_task *	rq_task;	/* RPC task data */
+	struct rpc_cred *	rq_cred;	/* Bound cred */
+	__be32			rq_xid;		/* request XID */
+	int			rq_cong;	/* has incremented xprt->cong */
+	u32			rq_seqno;	/* gss seq no. used on req. */
+	int			rq_enc_pages_num;
+	struct page		**rq_enc_pages;	/* scratch pages for use by
+						   gss privacy code */
+	void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
+
+	union {
+		struct list_head	rq_list;	/* Slot allocation list */
+		struct rb_node		rq_recv;	/* Receive queue */
+	};
+
+	struct list_head	rq_xmit;	/* Send queue */
+	struct list_head	rq_xmit2;	/* Send queue */
+
+	void			*rq_buffer;	/* Call XDR encode buffer */
+	size_t			rq_callsize;
+	void			*rq_rbuffer;	/* Reply XDR decode buffer */
+	size_t			rq_rcvsize;
+	size_t			rq_xmit_bytes_sent;	/* total bytes sent */
+	size_t			rq_reply_bytes_recvd;	/* total reply bytes */
+							/* received */
+
+	struct xdr_buf		rq_private_buf;		/* The receive buffer
+							 * used in the softirq.
+							 */
+	unsigned long		rq_majortimeo;	/* major timeout alarm */
+	unsigned long		rq_minortimeo;	/* minor timeout alarm */
+	unsigned long		rq_timeout;	/* Current timeout value */
+	ktime_t			rq_rtt;		/* round-trip time */
+	unsigned int		rq_retries;	/* # of retries */
+	unsigned int		rq_connect_cookie;
+						/* A cookie used to track the
+						   state of the transport
+						   connection */
+	atomic_t		rq_pin;
+	
+	/*
+	 * Partial send handling
+	 */
+	u32			rq_bytes_sent;	/* Bytes we have sent */
+
+	ktime_t			rq_xtime;	/* transmit time stamp */
+	int			rq_ntrans;
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	struct list_head	rq_bc_list;	/* Callback service list */
+	unsigned long		rq_bc_pa_state;	/* Backchannel prealloc state */
+	struct list_head	rq_bc_pa_list;	/* Backchannel prealloc list */
+#endif /* CONFIG_SUNRPC_BACKCHANEL */
+};
+#define rq_svec			rq_snd_buf.head
+#define rq_slen			rq_snd_buf.len
+
+struct rpc_xprt_ops {
+	void		(*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
+	int		(*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*free_slot)(struct rpc_xprt *xprt,
+				     struct rpc_rqst *req);
+	void		(*rpcbind)(struct rpc_task *task);
+	void		(*set_port)(struct rpc_xprt *xprt, unsigned short port);
+	void		(*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
+	int		(*get_srcaddr)(struct rpc_xprt *xprt, char *buf,
+				       size_t buflen);
+	unsigned short	(*get_srcport)(struct rpc_xprt *xprt);
+	int		(*buf_alloc)(struct rpc_task *task);
+	void		(*buf_free)(struct rpc_task *task);
+	int		(*prepare_request)(struct rpc_rqst *req,
+					   struct xdr_buf *buf);
+	int		(*send_request)(struct rpc_rqst *req);
+	void		(*wait_for_reply_request)(struct rpc_task *task);
+	void		(*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
+	void		(*release_request)(struct rpc_task *task);
+	void		(*close)(struct rpc_xprt *xprt);
+	void		(*destroy)(struct rpc_xprt *xprt);
+	void		(*set_connect_timeout)(struct rpc_xprt *xprt,
+					unsigned long connect_timeout,
+					unsigned long reconnect_timeout);
+	void		(*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
+	int		(*enable_swap)(struct rpc_xprt *xprt);
+	void		(*disable_swap)(struct rpc_xprt *xprt);
+	void		(*inject_disconnect)(struct rpc_xprt *xprt);
+	int		(*bc_setup)(struct rpc_xprt *xprt,
+				    unsigned int min_reqs);
+	size_t		(*bc_maxpayload)(struct rpc_xprt *xprt);
+	unsigned int	(*bc_num_slots)(struct rpc_xprt *xprt);
+	void		(*bc_free_rqst)(struct rpc_rqst *rqst);
+	void		(*bc_destroy)(struct rpc_xprt *xprt,
+				      unsigned int max_reqs);
+};
+
+/*
+ * RPC transport identifiers
+ *
+ * To preserve compatibility with the historical use of raw IP protocol
+ * id's for transport selection, UDP and TCP identifiers are specified
+ * with the previous values. No such restriction exists for new transports,
+ * except that they may not collide with these values (17 and 6,
+ * respectively).
+ */
+#define XPRT_TRANSPORT_BC       (1 << 31)
+enum xprt_transports {
+	XPRT_TRANSPORT_UDP	= IPPROTO_UDP,
+	XPRT_TRANSPORT_TCP	= IPPROTO_TCP,
+	XPRT_TRANSPORT_BC_TCP	= IPPROTO_TCP | XPRT_TRANSPORT_BC,
+	XPRT_TRANSPORT_RDMA	= 256,
+	XPRT_TRANSPORT_BC_RDMA	= XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
+	XPRT_TRANSPORT_LOCAL	= 257,
+};
+
+struct rpc_sysfs_xprt;
+struct rpc_xprt {
+	struct kref		kref;		/* Reference count */
+	const struct rpc_xprt_ops *ops;		/* transport methods */
+	unsigned int		id;		/* transport id */
+
+	const struct rpc_timeout *timeout;	/* timeout parms */
+	struct sockaddr_storage	addr;		/* server address */
+	size_t			addrlen;	/* size of server address */
+	int			prot;		/* IP protocol */
+
+	unsigned long		cong;		/* current congestion */
+	unsigned long		cwnd;		/* congestion window */
+
+	size_t			max_payload;	/* largest RPC payload size,
+						   in bytes */
+
+	struct rpc_wait_queue	binding;	/* requests waiting on rpcbind */
+	struct rpc_wait_queue	sending;	/* requests waiting to send */
+	struct rpc_wait_queue	pending;	/* requests in flight */
+	struct rpc_wait_queue	backlog;	/* waiting for slot */
+	struct list_head	free;		/* free slots */
+	unsigned int		max_reqs;	/* max number of slots */
+	unsigned int		min_reqs;	/* min number of slots */
+	unsigned int		num_reqs;	/* total slots */
+	unsigned long		state;		/* transport state */
+	unsigned char		resvport   : 1,	/* use a reserved port */
+				reuseport  : 1; /* reuse port on reconnect */
+	atomic_t		swapper;	/* we're swapping over this
+						   transport */
+	unsigned int		bind_index;	/* bind function index */
+
+	/*
+	 * Multipath
+	 */
+	struct list_head	xprt_switch;
+
+	/*
+	 * Connection of transports
+	 */
+	unsigned long		bind_timeout,
+				reestablish_timeout;
+	unsigned int		connect_cookie;	/* A cookie that gets bumped
+						   every time the transport
+						   is reconnected */
+
+	/*
+	 * Disconnection of idle transports
+	 */
+	struct work_struct	task_cleanup;
+	struct timer_list	timer;
+	unsigned long		last_used,
+				idle_timeout,
+				connect_timeout,
+				max_reconnect_timeout;
+
+	/*
+	 * Send stuff
+	 */
+	atomic_long_t		queuelen;
+	spinlock_t		transport_lock;	/* lock transport info */
+	spinlock_t		reserve_lock;	/* lock slot table */
+	spinlock_t		queue_lock;	/* send/receive queue lock */
+	u32			xid;		/* Next XID value to use */
+	struct rpc_task *	snd_task;	/* Task blocked in send */
+
+	struct list_head	xmit_queue;	/* Send queue */
+	atomic_long_t		xmit_queuelen;
+
+	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+	struct svc_serv		*bc_serv;       /* The RPC service which will */
+						/* process the callback */
+	unsigned int		bc_alloc_max;
+	unsigned int		bc_alloc_count;	/* Total number of preallocs */
+	atomic_t		bc_slot_count;	/* Number of allocated slots */
+	spinlock_t		bc_pa_lock;	/* Protects the preallocated
+						 * items */
+	struct list_head	bc_pa_list;	/* List of preallocated
+						 * backchannel rpc_rqst's */
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+	struct rb_root		recv_queue;	/* Receive queue */
+
+	struct {
+		unsigned long		bind_count,	/* total number of binds */
+					connect_count,	/* total number of connects */
+					connect_start,	/* connect start timestamp */
+					connect_time,	/* jiffies waiting for connect */
+					sends,		/* how many complete requests */
+					recvs,		/* how many complete requests */
+					bad_xids,	/* lookup_rqst didn't find XID */
+					max_slots;	/* max rpc_slots used */
+
+		unsigned long long	req_u,		/* average requests on the wire */
+					bklog_u,	/* backlog queue utilization */
+					sending_u,	/* send q utilization */
+					pending_u;	/* pend q utilization */
+	} stat;
+
+	struct net		*xprt_net;
+	netns_tracker		ns_tracker;
+	const char		*servername;
+	const char		*address_strings[RPC_DISPLAY_MAX];
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+	struct dentry		*debugfs;		/* debugfs directory */
+#endif
+	struct rcu_head		rcu;
+	const struct xprt_class	*xprt_class;
+	struct rpc_sysfs_xprt	*xprt_sysfs;
+	bool			main; /*mark if this is the 1st transport */
+};
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+/*
+ * Backchannel flags
+ */
+#define	RPC_BC_PA_IN_USE	0x0001		/* Preallocated backchannel */
+						/* buffer in use */
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#if defined(CONFIG_SUNRPC_BACKCHANNEL)
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+	return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
+}
+#else
+static inline int bc_prealloc(struct rpc_rqst *req)
+{
+	return 0;
+}
+#endif /* CONFIG_SUNRPC_BACKCHANNEL */
+
+#define XPRT_CREATE_INFINITE_SLOTS	(1U)
+#define XPRT_CREATE_NO_IDLE_TIMEOUT	(1U << 1)
+
+struct xprt_create {
+	int			ident;		/* XPRT_TRANSPORT identifier */
+	struct net *		net;
+	struct sockaddr *	srcaddr;	/* optional local address */
+	struct sockaddr *	dstaddr;	/* remote peer address */
+	size_t			addrlen;
+	const char		*servername;
+	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
+	struct rpc_xprt_switch	*bc_xps;
+	unsigned int		flags;
+};
+
+struct xprt_class {
+	struct list_head	list;
+	int			ident;		/* XPRT_TRANSPORT identifier */
+	struct rpc_xprt *	(*setup)(struct xprt_create *);
+	struct module		*owner;
+	char			name[32];
+	const char *		netid[];
+};
+
+/*
+ * Generic internal transport functions
+ */
+struct rpc_xprt		*xprt_create_transport(struct xprt_create *args);
+void			xprt_connect(struct rpc_task *task);
+unsigned long		xprt_reconnect_delay(const struct rpc_xprt *xprt);
+void			xprt_reconnect_backoff(struct rpc_xprt *xprt,
+					       unsigned long init_to);
+void			xprt_reserve(struct rpc_task *task);
+void			xprt_retry_reserve(struct rpc_task *task);
+int			xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
+int			xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_free_slot(struct rpc_xprt *xprt,
+				       struct rpc_rqst *req);
+bool			xprt_prepare_transmit(struct rpc_task *task);
+void			xprt_request_enqueue_transmit(struct rpc_task *task);
+int			xprt_request_enqueue_receive(struct rpc_task *task);
+void			xprt_request_wait_receive(struct rpc_task *task);
+void			xprt_request_dequeue_xprt(struct rpc_task *task);
+bool			xprt_request_need_retransmit(struct rpc_task *task);
+void			xprt_transmit(struct rpc_task *task);
+void			xprt_end_transmit(struct rpc_task *task);
+int			xprt_adjust_timeout(struct rpc_rqst *req);
+void			xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_release(struct rpc_task *task);
+struct rpc_xprt *	xprt_get(struct rpc_xprt *xprt);
+void			xprt_put(struct rpc_xprt *xprt);
+struct rpc_xprt *	xprt_alloc(struct net *net, size_t size,
+				unsigned int num_prealloc,
+				unsigned int max_req);
+void			xprt_free(struct rpc_xprt *);
+void			xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task);
+bool			xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req);
+void			xprt_cleanup_ids(void);
+
+static inline int
+xprt_enable_swap(struct rpc_xprt *xprt)
+{
+	return xprt->ops->enable_swap(xprt);
+}
+
+static inline void
+xprt_disable_swap(struct rpc_xprt *xprt)
+{
+	xprt->ops->disable_swap(xprt);
+}
+
+/*
+ * Transport switch helper functions
+ */
+int			xprt_register_transport(struct xprt_class *type);
+int			xprt_unregister_transport(struct xprt_class *type);
+int			xprt_find_transport_ident(const char *);
+void			xprt_wait_for_reply_request_def(struct rpc_task *task);
+void			xprt_wait_for_reply_request_rtt(struct rpc_task *task);
+void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
+void			xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
+bool			xprt_write_space(struct rpc_xprt *xprt);
+void			xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
+struct rpc_rqst *	xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
+void			xprt_update_rtt(struct rpc_task *task);
+void			xprt_complete_rqst(struct rpc_task *task, int copied);
+void			xprt_pin_rqst(struct rpc_rqst *req);
+void			xprt_unpin_rqst(struct rpc_rqst *req);
+void			xprt_release_rqst_cong(struct rpc_task *task);
+bool			xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req);
+void			xprt_disconnect_done(struct rpc_xprt *xprt);
+void			xprt_force_disconnect(struct rpc_xprt *xprt);
+void			xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
+
+bool			xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
+void			xprt_unlock_connect(struct rpc_xprt *, void *);
+void			xprt_release_write(struct rpc_xprt *, struct rpc_task *);
+
+/*
+ * Reserved bit positions in xprt->state
+ */
+#define XPRT_LOCKED		(0)
+#define XPRT_CONNECTED		(1)
+#define XPRT_CONNECTING		(2)
+#define XPRT_CLOSE_WAIT		(3)
+#define XPRT_BOUND		(4)
+#define XPRT_BINDING		(5)
+#define XPRT_CLOSING		(6)
+#define XPRT_OFFLINE		(7)
+#define XPRT_REMOVE		(8)
+#define XPRT_CONGESTED		(9)
+#define XPRT_CWND_WAIT		(10)
+#define XPRT_WRITE_SPACE	(11)
+#define XPRT_SND_IS_COOKIE	(12)
+
+static inline void xprt_set_connected(struct rpc_xprt *xprt)
+{
+	set_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline void xprt_clear_connected(struct rpc_xprt *xprt)
+{
+	clear_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_connected(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
+{
+	return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
+}
+
+static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
+{
+	smp_mb__before_atomic();
+	clear_bit(XPRT_CONNECTING, &xprt->state);
+	smp_mb__after_atomic();
+}
+
+static inline int xprt_connecting(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_CONNECTING, &xprt->state);
+}
+
+static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
+}
+
+static inline void xprt_set_bound(struct rpc_xprt *xprt)
+{
+	test_and_set_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline int xprt_bound(struct rpc_xprt *xprt)
+{
+	return test_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline void xprt_clear_bound(struct rpc_xprt *xprt)
+{
+	clear_bit(XPRT_BOUND, &xprt->state);
+}
+
+static inline void xprt_clear_binding(struct rpc_xprt *xprt)
+{
+	smp_mb__before_atomic();
+	clear_bit(XPRT_BINDING, &xprt->state);
+	smp_mb__after_atomic();
+}
+
+static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
+{
+	return test_and_set_bit(XPRT_BINDING, &xprt->state);
+}
+
+void xprt_set_offline_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
+void xprt_set_online_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
+void xprt_delete_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
+#endif /* _LINUX_SUNRPC_XPRT_H */
diff --git a/include/linux/sunrpc/xprtmultipath.h b/include/linux/sunrpc/xprtmultipath.h
new file mode 100644
index 000000000..c0514c684
--- /dev/null
+++ b/include/linux/sunrpc/xprtmultipath.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * RPC client multipathing definitions
+ *
+ * Copyright (c) 2015, 2016, Primary Data, Inc. All rights reserved.
+ *
+ * Trond Myklebust <trond.myklebust@primarydata.com>
+ */
+#ifndef _NET_SUNRPC_XPRTMULTIPATH_H
+#define _NET_SUNRPC_XPRTMULTIPATH_H
+
+struct rpc_xprt_iter_ops;
+struct rpc_sysfs_xprt_switch;
+struct rpc_xprt_switch {
+	spinlock_t		xps_lock;
+	struct kref		xps_kref;
+
+	unsigned int		xps_id;
+	unsigned int		xps_nxprts;
+	unsigned int		xps_nactive;
+	unsigned int		xps_nunique_destaddr_xprts;
+	atomic_long_t		xps_queuelen;
+	struct list_head	xps_xprt_list;
+
+	struct net *		xps_net;
+
+	const struct rpc_xprt_iter_ops *xps_iter_ops;
+
+	struct rpc_sysfs_xprt_switch *xps_sysfs;
+	struct rcu_head		xps_rcu;
+};
+
+struct rpc_xprt_iter {
+	struct rpc_xprt_switch __rcu *xpi_xpswitch;
+	struct rpc_xprt *	xpi_cursor;
+
+	const struct rpc_xprt_iter_ops *xpi_ops;
+};
+
+
+struct rpc_xprt_iter_ops {
+	void (*xpi_rewind)(struct rpc_xprt_iter *);
+	struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
+	struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
+};
+
+extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
+		gfp_t gfp_flags);
+
+extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
+extern void xprt_switch_put(struct rpc_xprt_switch *xps);
+
+extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
+
+extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
+		struct rpc_xprt *xprt);
+extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
+		struct rpc_xprt *xprt, bool offline);
+
+extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
+		struct rpc_xprt_switch *xps);
+
+extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
+		struct rpc_xprt_switch *xps);
+
+extern void xprt_iter_init_listoffline(struct rpc_xprt_iter *xpi,
+		struct rpc_xprt_switch *xps);
+
+extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
+
+extern void xprt_iter_rewind(struct rpc_xprt_iter *xpi);
+
+extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
+		struct rpc_xprt_iter *xpi,
+		struct rpc_xprt_switch *newswitch);
+
+extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
+extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
+extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
+
+extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
+		const struct sockaddr *sap);
+
+extern void xprt_multipath_cleanup_ids(void);
+
+#endif
diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
new file mode 100644
index 000000000..16c239e0d
--- /dev/null
+++ b/include/linux/sunrpc/xprtrdma.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/*
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the BSD-type
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *      Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *      Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following
+ *      disclaimer in the documentation and/or other materials provided
+ *      with the distribution.
+ *
+ *      Neither the name of the Network Appliance, Inc. nor the names of
+ *      its contributors may be used to endorse or promote products
+ *      derived from this software without specific prior written
+ *      permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRTRDMA_H
+#define _LINUX_SUNRPC_XPRTRDMA_H
+
+/*
+ * Constants. Max RPC/NFS header is big enough to account for
+ * additional marshaling buffers passed down by Linux client.
+ *
+ * RDMA header is currently fixed max size, and is big enough for a
+ * fully-chunked NFS message (read chunks are the largest). Note only
+ * a single chunk type per message is supported currently.
+ */
+#define RPCRDMA_MIN_SLOT_TABLE	(4U)
+#define RPCRDMA_DEF_SLOT_TABLE	(128U)
+#define RPCRDMA_MAX_SLOT_TABLE	(16384U)
+
+#define RPCRDMA_MIN_INLINE  (1024)	/* min inline thresh */
+#define RPCRDMA_DEF_INLINE  (4096)	/* default inline thresh */
+#define RPCRDMA_MAX_INLINE  (65536)	/* max inline thresh */
+
+/* Memory registration strategies, by number.
+ * This is part of a kernel / user space API. Do not remove. */
+enum rpcrdma_memreg {
+	RPCRDMA_BOUNCEBUFFERS = 0,
+	RPCRDMA_REGISTER,
+	RPCRDMA_MEMWINDOWS,
+	RPCRDMA_MEMWINDOWS_ASYNC,
+	RPCRDMA_MTHCAFMR,
+	RPCRDMA_FRWR,
+	RPCRDMA_ALLPHYSICAL,
+	RPCRDMA_LAST
+};
+
+#endif /* _LINUX_SUNRPC_XPRTRDMA_H */
diff --git a/include/linux/sunrpc/xprtsock.h b/include/linux/sunrpc/xprtsock.h
new file mode 100644
index 000000000..38284f25e
--- /dev/null
+++ b/include/linux/sunrpc/xprtsock.h
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/include/linux/sunrpc/xprtsock.h
+ *
+ *  Declarations for the RPC transport socket provider.
+ */
+
+#ifndef _LINUX_SUNRPC_XPRTSOCK_H
+#define _LINUX_SUNRPC_XPRTSOCK_H
+
+int		init_socket_xprt(void);
+void		cleanup_socket_xprt(void);
+
+#define RPC_MIN_RESVPORT	(1U)
+#define RPC_MAX_RESVPORT	(65535U)
+#define RPC_DEF_MIN_RESVPORT	(665U)
+#define RPC_DEF_MAX_RESVPORT	(1023U)
+
+struct sock_xprt {
+	struct rpc_xprt		xprt;
+
+	/*
+	 * Network layer
+	 */
+	struct socket *		sock;
+	struct sock *		inet;
+	struct file *		file;
+
+	/*
+	 * State of TCP reply receive
+	 */
+	struct {
+		struct {
+			__be32	fraghdr,
+				xid,
+				calldir;
+		} __attribute__((packed));
+
+		u32		offset,
+				len;
+
+		unsigned long	copied;
+	} recv;
+
+	/*
+	 * State of TCP transmit queue
+	 */
+	struct {
+		u32		offset;
+	} xmit;
+
+	/*
+	 * Connection of transports
+	 */
+	unsigned long		sock_state;
+	struct delayed_work	connect_worker;
+	struct work_struct	error_worker;
+	struct work_struct	recv_worker;
+	struct mutex		recv_mutex;
+	struct sockaddr_storage	srcaddr;
+	unsigned short		srcport;
+	int			xprt_err;
+
+	/*
+	 * UDP socket buffer size parameters
+	 */
+	size_t			rcvsize,
+				sndsize;
+
+	struct rpc_timeout	tcp_timeout;
+
+	/*
+	 * Saved socket callback addresses
+	 */
+	void			(*old_data_ready)(struct sock *);
+	void			(*old_state_change)(struct sock *);
+	void			(*old_write_space)(struct sock *);
+	void			(*old_error_report)(struct sock *);
+};
+
+/*
+ * TCP RPC flags
+ */
+#define XPRT_SOCK_CONNECTING	1U
+#define XPRT_SOCK_DATA_READY	(2)
+#define XPRT_SOCK_UPD_TIMEOUT	(3)
+#define XPRT_SOCK_WAKE_ERROR	(4)
+#define XPRT_SOCK_WAKE_WRITE	(5)
+#define XPRT_SOCK_WAKE_PENDING	(6)
+#define XPRT_SOCK_WAKE_DISCONNECT	(7)
+#define XPRT_SOCK_CONNECT_SENT	(8)
+#define XPRT_SOCK_NOSPACE	(9)
+
+#endif /* _LINUX_SUNRPC_XPRTSOCK_H */