1 files changed, 71 insertions, 0 deletions
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 */