diff options
Diffstat (limited to '')
| -rw-r--r-- | net/sunrpc/xprtrdma/transport.c | 809 |
1 files changed, 809 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c new file mode 100644 index 000000000..9cf10cfb8 --- /dev/null +++ b/net/sunrpc/xprtrdma/transport.c @@ -0,0 +1,809 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Copyright (c) 2014-2017 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. + */ + +/* + * transport.c + * + * This file contains the top-level implementation of an RPC RDMA + * transport. + * + * Naming convention: functions beginning with xprt_ are part of the + * transport switch. All others are RPC RDMA internal. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/seq_file.h> +#include <linux/smp.h> + +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/svc_rdma.h> + +#include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> + +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) +# define RPCDBG_FACILITY RPCDBG_TRANS +#endif + +/* + * tunables + */ + +static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; +unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; +unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; +unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR; +int xprt_rdma_pad_optimize; + +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) + +static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; +static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; +static unsigned int min_inline_size = RPCRDMA_MIN_INLINE; +static unsigned int max_inline_size = RPCRDMA_MAX_INLINE; +static unsigned int max_padding = PAGE_SIZE; +static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; +static unsigned int max_memreg = RPCRDMA_LAST - 1; +static unsigned int dummy; + +static struct ctl_table_header *sunrpc_table_header; + +static struct ctl_table xr_tunables_table[] = { + { + .procname = "rdma_slot_table_entries", + .data = &xprt_rdma_slot_table_entries, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_slot_table_size, + .extra2 = &max_slot_table_size + }, + { + .procname = "rdma_max_inline_read", + .data = &xprt_rdma_max_inline_read, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_inline_size, + .extra2 = &max_inline_size, + }, + { + .procname = "rdma_max_inline_write", + .data = &xprt_rdma_max_inline_write, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_inline_size, + .extra2 = &max_inline_size, + }, + { + .procname = "rdma_inline_write_padding", + .data = &dummy, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = &max_padding, + }, + { + .procname = "rdma_memreg_strategy", + .data = &xprt_rdma_memreg_strategy, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_memreg, + .extra2 = &max_memreg, + }, + { + .procname = "rdma_pad_optimize", + .data = &xprt_rdma_pad_optimize, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { }, +}; + +static struct ctl_table sunrpc_table[] = { + { + .procname = "sunrpc", + .mode = 0555, + .child = xr_tunables_table + }, + { }, +}; + +#endif + +static const struct rpc_xprt_ops xprt_rdma_procs; + +static void +xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) +{ + struct sockaddr_in *sin = (struct sockaddr_in *)sap; + char buf[20]; + + snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); + xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); + + xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; +} + +static void +xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) +{ + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; + char buf[40]; + + snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); + xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); + + xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; +} + +void +xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) +{ + char buf[128]; + + switch (sap->sa_family) { + case AF_INET: + xprt_rdma_format_addresses4(xprt, sap); + break; + case AF_INET6: + xprt_rdma_format_addresses6(xprt, sap); + break; + default: + pr_err("rpcrdma: Unrecognized address family\n"); + return; + } + + (void)rpc_ntop(sap, buf, sizeof(buf)); + xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); + + snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); + + snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); + xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); + + xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; +} + +void +xprt_rdma_free_addresses(struct rpc_xprt *xprt) +{ + unsigned int i; + + for (i = 0; i < RPC_DISPLAY_MAX; i++) + switch (i) { + case RPC_DISPLAY_PROTO: + case RPC_DISPLAY_NETID: + continue; + default: + kfree(xprt->address_strings[i]); + } +} + +/** + * xprt_rdma_connect_worker - establish connection in the background + * @work: worker thread context + * + * Requester holds the xprt's send lock to prevent activity on this + * transport while a fresh connection is being established. RPC tasks + * sleep on the xprt's pending queue waiting for connect to complete. + */ +static void +xprt_rdma_connect_worker(struct work_struct *work) +{ + struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, + rx_connect_worker.work); + struct rpc_xprt *xprt = &r_xprt->rx_xprt; + int rc; + + rc = rpcrdma_xprt_connect(r_xprt); + xprt_clear_connecting(xprt); + if (!rc) { + xprt->connect_cookie++; + xprt->stat.connect_count++; + xprt->stat.connect_time += (long)jiffies - + xprt->stat.connect_start; + xprt_set_connected(xprt); + rc = -EAGAIN; + } else + rpcrdma_xprt_disconnect(r_xprt); + xprt_unlock_connect(xprt, r_xprt); + xprt_wake_pending_tasks(xprt, rc); +} + +/** + * xprt_rdma_inject_disconnect - inject a connection fault + * @xprt: transport context + * + * If @xprt is connected, disconnect it to simulate spurious + * connection loss. Caller must hold @xprt's send lock to + * ensure that data structures and hardware resources are + * stable during the rdma_disconnect() call. + */ +static void +xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + + trace_xprtrdma_op_inject_dsc(r_xprt); + rdma_disconnect(r_xprt->rx_ep->re_id); +} + +/** + * xprt_rdma_destroy - Full tear down of transport + * @xprt: doomed transport context + * + * Caller guarantees there will be no more calls to us with + * this @xprt. + */ +static void +xprt_rdma_destroy(struct rpc_xprt *xprt) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + + cancel_delayed_work_sync(&r_xprt->rx_connect_worker); + + rpcrdma_xprt_disconnect(r_xprt); + rpcrdma_buffer_destroy(&r_xprt->rx_buf); + + xprt_rdma_free_addresses(xprt); + xprt_free(xprt); + + module_put(THIS_MODULE); +} + +/* 60 second timeout, no retries */ +static const struct rpc_timeout xprt_rdma_default_timeout = { + .to_initval = 60 * HZ, + .to_maxval = 60 * HZ, +}; + +/** + * xprt_setup_rdma - Set up transport to use RDMA + * + * @args: rpc transport arguments + */ +static struct rpc_xprt * +xprt_setup_rdma(struct xprt_create *args) +{ + struct rpc_xprt *xprt; + struct rpcrdma_xprt *new_xprt; + struct sockaddr *sap; + int rc; + + if (args->addrlen > sizeof(xprt->addr)) + return ERR_PTR(-EBADF); + + if (!try_module_get(THIS_MODULE)) + return ERR_PTR(-EIO); + + xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, + xprt_rdma_slot_table_entries); + if (!xprt) { + module_put(THIS_MODULE); + return ERR_PTR(-ENOMEM); + } + + xprt->timeout = &xprt_rdma_default_timeout; + xprt->connect_timeout = xprt->timeout->to_initval; + xprt->max_reconnect_timeout = xprt->timeout->to_maxval; + xprt->bind_timeout = RPCRDMA_BIND_TO; + xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; + xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; + + xprt->resvport = 0; /* privileged port not needed */ + xprt->ops = &xprt_rdma_procs; + + /* + * Set up RDMA-specific connect data. + */ + sap = args->dstaddr; + + /* Ensure xprt->addr holds valid server TCP (not RDMA) + * address, for any side protocols which peek at it */ + xprt->prot = IPPROTO_TCP; + xprt->addrlen = args->addrlen; + memcpy(&xprt->addr, sap, xprt->addrlen); + + if (rpc_get_port(sap)) + xprt_set_bound(xprt); + xprt_rdma_format_addresses(xprt, sap); + + new_xprt = rpcx_to_rdmax(xprt); + rc = rpcrdma_buffer_create(new_xprt); + if (rc) { + xprt_rdma_free_addresses(xprt); + xprt_free(xprt); + module_put(THIS_MODULE); + return ERR_PTR(rc); + } + + INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, + xprt_rdma_connect_worker); + + xprt->max_payload = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT; + + return xprt; +} + +/** + * xprt_rdma_close - close a transport connection + * @xprt: transport context + * + * Called during autoclose or device removal. + * + * Caller holds @xprt's send lock to prevent activity on this + * transport while the connection is torn down. + */ +void xprt_rdma_close(struct rpc_xprt *xprt) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + + rpcrdma_xprt_disconnect(r_xprt); + + xprt->reestablish_timeout = 0; + ++xprt->connect_cookie; + xprt_disconnect_done(xprt); +} + +/** + * xprt_rdma_set_port - update server port with rpcbind result + * @xprt: controlling RPC transport + * @port: new port value + * + * Transport connect status is unchanged. + */ +static void +xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) +{ + struct sockaddr *sap = (struct sockaddr *)&xprt->addr; + char buf[8]; + + rpc_set_port(sap, port); + + kfree(xprt->address_strings[RPC_DISPLAY_PORT]); + snprintf(buf, sizeof(buf), "%u", port); + xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); + + kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); + snprintf(buf, sizeof(buf), "%4hx", port); + xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); +} + +/** + * xprt_rdma_timer - invoked when an RPC times out + * @xprt: controlling RPC transport + * @task: RPC task that timed out + * + * Invoked when the transport is still connected, but an RPC + * retransmit timeout occurs. + * + * Since RDMA connections don't have a keep-alive, forcibly + * disconnect and retry to connect. This drives full + * detection of the network path, and retransmissions of + * all pending RPCs. + */ +static void +xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) +{ + xprt_force_disconnect(xprt); +} + +/** + * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection + * @xprt: controlling transport instance + * @connect_timeout: reconnect timeout after client disconnects + * @reconnect_timeout: reconnect timeout after server disconnects + * + */ +static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt, + unsigned long connect_timeout, + unsigned long reconnect_timeout) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + + trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout); + + spin_lock(&xprt->transport_lock); + + if (connect_timeout < xprt->connect_timeout) { + struct rpc_timeout to; + unsigned long initval; + + to = *xprt->timeout; + initval = connect_timeout; + if (initval < RPCRDMA_INIT_REEST_TO << 1) + initval = RPCRDMA_INIT_REEST_TO << 1; + to.to_initval = initval; + to.to_maxval = initval; + r_xprt->rx_timeout = to; + xprt->timeout = &r_xprt->rx_timeout; + xprt->connect_timeout = connect_timeout; + } + + if (reconnect_timeout < xprt->max_reconnect_timeout) + xprt->max_reconnect_timeout = reconnect_timeout; + + spin_unlock(&xprt->transport_lock); +} + +/** + * xprt_rdma_connect - schedule an attempt to reconnect + * @xprt: transport state + * @task: RPC scheduler context (unused) + * + */ +static void +xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + struct rpcrdma_ep *ep = r_xprt->rx_ep; + unsigned long delay; + + WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt)); + + delay = 0; + if (ep && ep->re_connect_status != 0) { + delay = xprt_reconnect_delay(xprt); + xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO); + } + trace_xprtrdma_op_connect(r_xprt, delay); + queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker, + delay); +} + +/** + * xprt_rdma_alloc_slot - allocate an rpc_rqst + * @xprt: controlling RPC transport + * @task: RPC task requesting a fresh rpc_rqst + * + * tk_status values: + * %0 if task->tk_rqstp points to a fresh rpc_rqst + * %-EAGAIN if no rpc_rqst is available; queued on backlog + */ +static void +xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + struct rpcrdma_req *req; + + req = rpcrdma_buffer_get(&r_xprt->rx_buf); + if (!req) + goto out_sleep; + task->tk_rqstp = &req->rl_slot; + task->tk_status = 0; + return; + +out_sleep: + task->tk_status = -ENOMEM; + xprt_add_backlog(xprt, task); +} + +/** + * xprt_rdma_free_slot - release an rpc_rqst + * @xprt: controlling RPC transport + * @rqst: rpc_rqst to release + * + */ +static void +xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) +{ + struct rpcrdma_xprt *r_xprt = + container_of(xprt, struct rpcrdma_xprt, rx_xprt); + + rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); + if (!xprt_wake_up_backlog(xprt, rqst)) { + memset(rqst, 0, sizeof(*rqst)); + rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); + } +} + +static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt, + struct rpcrdma_regbuf *rb, size_t size, + gfp_t flags) +{ + if (unlikely(rdmab_length(rb) < size)) { + if (!rpcrdma_regbuf_realloc(rb, size, flags)) + return false; + r_xprt->rx_stats.hardway_register_count += size; + } + return true; +} + +/** + * xprt_rdma_allocate - allocate transport resources for an RPC + * @task: RPC task + * + * Return values: + * 0: Success; rq_buffer points to RPC buffer to use + * ENOMEM: Out of memory, call again later + * EIO: A permanent error occurred, do not retry + */ +static int +xprt_rdma_allocate(struct rpc_task *task) +{ + struct rpc_rqst *rqst = task->tk_rqstp; + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); + struct rpcrdma_req *req = rpcr_to_rdmar(rqst); + gfp_t flags; + + flags = RPCRDMA_DEF_GFP; + if (RPC_IS_ASYNC(task)) + flags = GFP_NOWAIT | __GFP_NOWARN; + if (RPC_IS_SWAPPER(task)) + flags |= __GFP_MEMALLOC; + + if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize, + flags)) + goto out_fail; + if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize, + flags)) + goto out_fail; + + rqst->rq_buffer = rdmab_data(req->rl_sendbuf); + rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf); + return 0; + +out_fail: + return -ENOMEM; +} + +/** + * xprt_rdma_free - release resources allocated by xprt_rdma_allocate + * @task: RPC task + * + * Caller guarantees rqst->rq_buffer is non-NULL. + */ +static void +xprt_rdma_free(struct rpc_task *task) +{ + struct rpc_rqst *rqst = task->tk_rqstp; + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); + struct rpcrdma_req *req = rpcr_to_rdmar(rqst); + + if (!list_empty(&req->rl_registered)) + frwr_unmap_sync(r_xprt, req); + + /* XXX: If the RPC is completing because of a signal and + * not because a reply was received, we ought to ensure + * that the Send completion has fired, so that memory + * involved with the Send is not still visible to the NIC. + */ +} + +/** + * xprt_rdma_send_request - marshal and send an RPC request + * @rqst: RPC message in rq_snd_buf + * + * Caller holds the transport's write lock. + * + * Returns: + * %0 if the RPC message has been sent + * %-ENOTCONN if the caller should reconnect and call again + * %-EAGAIN if the caller should call again + * %-ENOBUFS if the caller should call again after a delay + * %-EMSGSIZE if encoding ran out of buffer space. The request + * was not sent. Do not try to send this message again. + * %-EIO if an I/O error occurred. The request was not sent. + * Do not try to send this message again. + */ +static int +xprt_rdma_send_request(struct rpc_rqst *rqst) +{ + struct rpc_xprt *xprt = rqst->rq_xprt; + struct rpcrdma_req *req = rpcr_to_rdmar(rqst); + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + int rc = 0; + +#if defined(CONFIG_SUNRPC_BACKCHANNEL) + if (unlikely(!rqst->rq_buffer)) + return xprt_rdma_bc_send_reply(rqst); +#endif /* CONFIG_SUNRPC_BACKCHANNEL */ + + if (!xprt_connected(xprt)) + return -ENOTCONN; + + if (!xprt_request_get_cong(xprt, rqst)) + return -EBADSLT; + + rc = rpcrdma_marshal_req(r_xprt, rqst); + if (rc < 0) + goto failed_marshal; + + /* Must suppress retransmit to maintain credits */ + if (rqst->rq_connect_cookie == xprt->connect_cookie) + goto drop_connection; + rqst->rq_xtime = ktime_get(); + + if (rpcrdma_post_sends(r_xprt, req)) + goto drop_connection; + + rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; + + /* An RPC with no reply will throw off credit accounting, + * so drop the connection to reset the credit grant. + */ + if (!rpc_reply_expected(rqst->rq_task)) + goto drop_connection; + return 0; + +failed_marshal: + if (rc != -ENOTCONN) + return rc; +drop_connection: + xprt_rdma_close(xprt); + return -ENOTCONN; +} + +void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) +{ + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + long idle_time = 0; + + if (xprt_connected(xprt)) + idle_time = (long)(jiffies - xprt->last_used) / HZ; + + seq_puts(seq, "\txprt:\trdma "); + seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", + 0, /* need a local port? */ + xprt->stat.bind_count, + xprt->stat.connect_count, + xprt->stat.connect_time / HZ, + idle_time, + xprt->stat.sends, + xprt->stat.recvs, + xprt->stat.bad_xids, + xprt->stat.req_u, + xprt->stat.bklog_u); + seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", + r_xprt->rx_stats.read_chunk_count, + r_xprt->rx_stats.write_chunk_count, + r_xprt->rx_stats.reply_chunk_count, + r_xprt->rx_stats.total_rdma_request, + r_xprt->rx_stats.total_rdma_reply, + r_xprt->rx_stats.pullup_copy_count, + r_xprt->rx_stats.fixup_copy_count, + r_xprt->rx_stats.hardway_register_count, + r_xprt->rx_stats.failed_marshal_count, + r_xprt->rx_stats.bad_reply_count, + r_xprt->rx_stats.nomsg_call_count); + seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n", + r_xprt->rx_stats.mrs_recycled, + r_xprt->rx_stats.mrs_orphaned, + r_xprt->rx_stats.mrs_allocated, + r_xprt->rx_stats.local_inv_needed, + r_xprt->rx_stats.empty_sendctx_q, + r_xprt->rx_stats.reply_waits_for_send); +} + +static int +xprt_rdma_enable_swap(struct rpc_xprt *xprt) +{ + return 0; +} + +static void +xprt_rdma_disable_swap(struct rpc_xprt *xprt) +{ +} + +/* + * Plumbing for rpc transport switch and kernel module + */ + +static const struct rpc_xprt_ops xprt_rdma_procs = { + .reserve_xprt = xprt_reserve_xprt_cong, + .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ + .alloc_slot = xprt_rdma_alloc_slot, + .free_slot = xprt_rdma_free_slot, + .release_request = xprt_release_rqst_cong, /* ditto */ + .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */ + .timer = xprt_rdma_timer, + .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ + .set_port = xprt_rdma_set_port, + .connect = xprt_rdma_connect, + .buf_alloc = xprt_rdma_allocate, + .buf_free = xprt_rdma_free, + .send_request = xprt_rdma_send_request, + .close = xprt_rdma_close, + .destroy = xprt_rdma_destroy, + .set_connect_timeout = xprt_rdma_set_connect_timeout, + .print_stats = xprt_rdma_print_stats, + .enable_swap = xprt_rdma_enable_swap, + .disable_swap = xprt_rdma_disable_swap, + .inject_disconnect = xprt_rdma_inject_disconnect, +#if defined(CONFIG_SUNRPC_BACKCHANNEL) + .bc_setup = xprt_rdma_bc_setup, + .bc_maxpayload = xprt_rdma_bc_maxpayload, + .bc_num_slots = xprt_rdma_bc_max_slots, + .bc_free_rqst = xprt_rdma_bc_free_rqst, + .bc_destroy = xprt_rdma_bc_destroy, +#endif +}; + +static struct xprt_class xprt_rdma = { + .list = LIST_HEAD_INIT(xprt_rdma.list), + .name = "rdma", + .owner = THIS_MODULE, + .ident = XPRT_TRANSPORT_RDMA, + .setup = xprt_setup_rdma, + .netid = { "rdma", "rdma6", "" }, +}; + +void xprt_rdma_cleanup(void) +{ +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) + if (sunrpc_table_header) { + unregister_sysctl_table(sunrpc_table_header); + sunrpc_table_header = NULL; + } +#endif + + xprt_unregister_transport(&xprt_rdma); + xprt_unregister_transport(&xprt_rdma_bc); +} + +int xprt_rdma_init(void) +{ + int rc; + + rc = xprt_register_transport(&xprt_rdma); + if (rc) + return rc; + + rc = xprt_register_transport(&xprt_rdma_bc); + if (rc) { + xprt_unregister_transport(&xprt_rdma); + return rc; + } + +#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) + if (!sunrpc_table_header) + sunrpc_table_header = register_sysctl_table(sunrpc_table); +#endif + return 0; +} |