1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
3 * Copyright (c) 2014-2017 Oracle. All rights reserved.
4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
6 * This software is available to you under a choice of one of two
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8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the BSD-type
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13 * modification, are permitted provided that the following conditions
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22 * with the distribution.
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39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 * This file contains the top-level implementation of an RPC RDMA
48 * Naming convention: functions beginning with xprt_ are part of the
49 * transport switch. All others are RPC RDMA internal.
52 #include <linux/module.h>
53 #include <linux/slab.h>
54 #include <linux/seq_file.h>
55 #include <linux/smp.h>
57 #include <linux/sunrpc/addr.h>
58 #include <linux/sunrpc/svc_rdma.h>
60 #include "xprt_rdma.h"
61 #include <trace/events/rpcrdma.h>
63 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
64 # define RPCDBG_FACILITY RPCDBG_TRANS
71 unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
72 unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
73 unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
74 unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR;
75 int xprt_rdma_pad_optimize;
77 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
79 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
80 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
81 static unsigned int min_inline_size = RPCRDMA_MIN_INLINE;
82 static unsigned int max_inline_size = RPCRDMA_MAX_INLINE;
83 static unsigned int max_padding = PAGE_SIZE;
84 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
85 static unsigned int max_memreg = RPCRDMA_LAST - 1;
86 static unsigned int dummy;
88 static struct ctl_table_header *sunrpc_table_header;
90 static struct ctl_table xr_tunables_table[] = {
92 .procname = "rdma_slot_table_entries",
93 .data = &xprt_rdma_slot_table_entries,
94 .maxlen = sizeof(unsigned int),
96 .proc_handler = proc_dointvec_minmax,
97 .extra1 = &min_slot_table_size,
98 .extra2 = &max_slot_table_size
101 .procname = "rdma_max_inline_read",
102 .data = &xprt_rdma_max_inline_read,
103 .maxlen = sizeof(unsigned int),
105 .proc_handler = proc_dointvec_minmax,
106 .extra1 = &min_inline_size,
107 .extra2 = &max_inline_size,
110 .procname = "rdma_max_inline_write",
111 .data = &xprt_rdma_max_inline_write,
112 .maxlen = sizeof(unsigned int),
114 .proc_handler = proc_dointvec_minmax,
115 .extra1 = &min_inline_size,
116 .extra2 = &max_inline_size,
119 .procname = "rdma_inline_write_padding",
121 .maxlen = sizeof(unsigned int),
123 .proc_handler = proc_dointvec_minmax,
124 .extra1 = SYSCTL_ZERO,
125 .extra2 = &max_padding,
128 .procname = "rdma_memreg_strategy",
129 .data = &xprt_rdma_memreg_strategy,
130 .maxlen = sizeof(unsigned int),
132 .proc_handler = proc_dointvec_minmax,
133 .extra1 = &min_memreg,
134 .extra2 = &max_memreg,
137 .procname = "rdma_pad_optimize",
138 .data = &xprt_rdma_pad_optimize,
139 .maxlen = sizeof(unsigned int),
141 .proc_handler = proc_dointvec,
146 static struct ctl_table sunrpc_table[] = {
148 .procname = "sunrpc",
150 .child = xr_tunables_table
157 static const struct rpc_xprt_ops xprt_rdma_procs;
160 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
162 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
165 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
166 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
168 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
172 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
174 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
177 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
178 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
180 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
184 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap)
188 switch (sap->sa_family) {
190 xprt_rdma_format_addresses4(xprt, sap);
193 xprt_rdma_format_addresses6(xprt, sap);
196 pr_err("rpcrdma: Unrecognized address family\n");
200 (void)rpc_ntop(sap, buf, sizeof(buf));
201 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
203 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
204 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
206 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
207 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
209 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
213 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
217 for (i = 0; i < RPC_DISPLAY_MAX; i++)
219 case RPC_DISPLAY_PROTO:
220 case RPC_DISPLAY_NETID:
223 kfree(xprt->address_strings[i]);
228 * xprt_rdma_connect_worker - establish connection in the background
229 * @work: worker thread context
231 * Requester holds the xprt's send lock to prevent activity on this
232 * transport while a fresh connection is being established. RPC tasks
233 * sleep on the xprt's pending queue waiting for connect to complete.
236 xprt_rdma_connect_worker(struct work_struct *work)
238 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
239 rx_connect_worker.work);
240 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
243 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
244 xprt_clear_connecting(xprt);
245 if (r_xprt->rx_ep.rep_connected > 0) {
246 if (!xprt_test_and_set_connected(xprt)) {
247 xprt->stat.connect_count++;
248 xprt->stat.connect_time += (long)jiffies -
249 xprt->stat.connect_start;
250 xprt_wake_pending_tasks(xprt, -EAGAIN);
253 if (xprt_test_and_clear_connected(xprt))
254 xprt_wake_pending_tasks(xprt, rc);
259 * xprt_rdma_inject_disconnect - inject a connection fault
260 * @xprt: transport context
262 * If @xprt is connected, disconnect it to simulate spurious connection
266 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
268 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
270 trace_xprtrdma_op_inject_dsc(r_xprt);
271 rdma_disconnect(r_xprt->rx_ia.ri_id);
275 * xprt_rdma_destroy - Full tear down of transport
276 * @xprt: doomed transport context
278 * Caller guarantees there will be no more calls to us with
282 xprt_rdma_destroy(struct rpc_xprt *xprt)
284 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
286 trace_xprtrdma_op_destroy(r_xprt);
288 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
290 rpcrdma_ep_destroy(r_xprt);
291 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
292 rpcrdma_ia_close(&r_xprt->rx_ia);
294 xprt_rdma_free_addresses(xprt);
297 module_put(THIS_MODULE);
300 /* 60 second timeout, no retries */
301 static const struct rpc_timeout xprt_rdma_default_timeout = {
302 .to_initval = 60 * HZ,
303 .to_maxval = 60 * HZ,
307 * xprt_setup_rdma - Set up transport to use RDMA
309 * @args: rpc transport arguments
311 static struct rpc_xprt *
312 xprt_setup_rdma(struct xprt_create *args)
314 struct rpc_xprt *xprt;
315 struct rpcrdma_xprt *new_xprt;
316 struct sockaddr *sap;
319 if (args->addrlen > sizeof(xprt->addr))
320 return ERR_PTR(-EBADF);
322 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
324 return ERR_PTR(-ENOMEM);
326 xprt->timeout = &xprt_rdma_default_timeout;
327 xprt->connect_timeout = xprt->timeout->to_initval;
328 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
329 xprt->bind_timeout = RPCRDMA_BIND_TO;
330 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
331 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
333 xprt->resvport = 0; /* privileged port not needed */
334 xprt->ops = &xprt_rdma_procs;
337 * Set up RDMA-specific connect data.
341 /* Ensure xprt->addr holds valid server TCP (not RDMA)
342 * address, for any side protocols which peek at it */
343 xprt->prot = IPPROTO_TCP;
344 xprt->addrlen = args->addrlen;
345 memcpy(&xprt->addr, sap, xprt->addrlen);
347 if (rpc_get_port(sap))
348 xprt_set_bound(xprt);
349 xprt_rdma_format_addresses(xprt, sap);
351 new_xprt = rpcx_to_rdmax(xprt);
352 rc = rpcrdma_ia_open(new_xprt);
356 rc = rpcrdma_ep_create(new_xprt);
360 rc = rpcrdma_buffer_create(new_xprt);
364 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
365 xprt_rdma_connect_worker);
367 xprt->max_payload = frwr_maxpages(new_xprt);
368 if (xprt->max_payload == 0)
370 xprt->max_payload <<= PAGE_SHIFT;
371 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
372 __func__, xprt->max_payload);
374 if (!try_module_get(THIS_MODULE))
377 dprintk("RPC: %s: %s:%s\n", __func__,
378 xprt->address_strings[RPC_DISPLAY_ADDR],
379 xprt->address_strings[RPC_DISPLAY_PORT]);
380 trace_xprtrdma_create(new_xprt);
384 rpcrdma_buffer_destroy(&new_xprt->rx_buf);
387 rpcrdma_ep_destroy(new_xprt);
389 rpcrdma_ia_close(&new_xprt->rx_ia);
391 trace_xprtrdma_op_destroy(new_xprt);
392 xprt_rdma_free_addresses(xprt);
398 * xprt_rdma_close - close a transport connection
399 * @xprt: transport context
401 * Called during autoclose or device removal.
403 * Caller holds @xprt's send lock to prevent activity on this
404 * transport while the connection is torn down.
406 void xprt_rdma_close(struct rpc_xprt *xprt)
408 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
409 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
410 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
414 trace_xprtrdma_op_close(r_xprt);
416 /* Prevent marshaling and sending of new requests */
417 xprt_clear_connected(xprt);
419 if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
420 rpcrdma_ia_remove(ia);
424 if (ep->rep_connected == -ENODEV)
426 if (ep->rep_connected > 0)
427 xprt->reestablish_timeout = 0;
428 rpcrdma_ep_disconnect(ep, ia);
430 /* Prepare @xprt for the next connection by reinitializing
431 * its credit grant to one (see RFC 8166, Section 3.3.3).
433 r_xprt->rx_buf.rb_credits = 1;
434 xprt->cwnd = RPC_CWNDSHIFT;
437 ++xprt->connect_cookie;
438 xprt_disconnect_done(xprt);
442 * xprt_rdma_set_port - update server port with rpcbind result
443 * @xprt: controlling RPC transport
444 * @port: new port value
446 * Transport connect status is unchanged.
449 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
451 struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
454 dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n",
456 xprt->address_strings[RPC_DISPLAY_ADDR],
457 xprt->address_strings[RPC_DISPLAY_PORT],
460 rpc_set_port(sap, port);
462 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
463 snprintf(buf, sizeof(buf), "%u", port);
464 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
466 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
467 snprintf(buf, sizeof(buf), "%4hx", port);
468 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
472 * xprt_rdma_timer - invoked when an RPC times out
473 * @xprt: controlling RPC transport
474 * @task: RPC task that timed out
476 * Invoked when the transport is still connected, but an RPC
477 * retransmit timeout occurs.
479 * Since RDMA connections don't have a keep-alive, forcibly
480 * disconnect and retry to connect. This drives full
481 * detection of the network path, and retransmissions of
485 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
487 xprt_force_disconnect(xprt);
491 * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection
492 * @xprt: controlling transport instance
493 * @connect_timeout: reconnect timeout after client disconnects
494 * @reconnect_timeout: reconnect timeout after server disconnects
497 static void xprt_rdma_tcp_set_connect_timeout(struct rpc_xprt *xprt,
498 unsigned long connect_timeout,
499 unsigned long reconnect_timeout)
501 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
503 trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout);
505 spin_lock(&xprt->transport_lock);
507 if (connect_timeout < xprt->connect_timeout) {
508 struct rpc_timeout to;
509 unsigned long initval;
512 initval = connect_timeout;
513 if (initval < RPCRDMA_INIT_REEST_TO << 1)
514 initval = RPCRDMA_INIT_REEST_TO << 1;
515 to.to_initval = initval;
516 to.to_maxval = initval;
517 r_xprt->rx_timeout = to;
518 xprt->timeout = &r_xprt->rx_timeout;
519 xprt->connect_timeout = connect_timeout;
522 if (reconnect_timeout < xprt->max_reconnect_timeout)
523 xprt->max_reconnect_timeout = reconnect_timeout;
525 spin_unlock(&xprt->transport_lock);
529 * xprt_rdma_connect - schedule an attempt to reconnect
530 * @xprt: transport state
531 * @task: RPC scheduler context (unused)
535 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
537 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
540 trace_xprtrdma_op_connect(r_xprt);
543 if (r_xprt->rx_ep.rep_connected != 0) {
544 delay = xprt_reconnect_delay(xprt);
545 xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO);
547 queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker,
552 * xprt_rdma_alloc_slot - allocate an rpc_rqst
553 * @xprt: controlling RPC transport
554 * @task: RPC task requesting a fresh rpc_rqst
557 * %0 if task->tk_rqstp points to a fresh rpc_rqst
558 * %-EAGAIN if no rpc_rqst is available; queued on backlog
561 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
563 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
564 struct rpcrdma_req *req;
566 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
569 task->tk_rqstp = &req->rl_slot;
574 set_bit(XPRT_CONGESTED, &xprt->state);
575 rpc_sleep_on(&xprt->backlog, task, NULL);
576 task->tk_status = -EAGAIN;
580 * xprt_rdma_free_slot - release an rpc_rqst
581 * @xprt: controlling RPC transport
582 * @rqst: rpc_rqst to release
586 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
588 struct rpcrdma_xprt *r_xprt =
589 container_of(xprt, struct rpcrdma_xprt, rx_xprt);
591 memset(rqst, 0, sizeof(*rqst));
592 rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst));
593 if (unlikely(!rpc_wake_up_next(&xprt->backlog)))
594 clear_bit(XPRT_CONGESTED, &xprt->state);
597 static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt,
598 struct rpcrdma_regbuf *rb, size_t size,
601 if (unlikely(rdmab_length(rb) < size)) {
602 if (!rpcrdma_regbuf_realloc(rb, size, flags))
604 r_xprt->rx_stats.hardway_register_count += size;
610 * xprt_rdma_allocate - allocate transport resources for an RPC
614 * 0: Success; rq_buffer points to RPC buffer to use
615 * ENOMEM: Out of memory, call again later
616 * EIO: A permanent error occurred, do not retry
619 xprt_rdma_allocate(struct rpc_task *task)
621 struct rpc_rqst *rqst = task->tk_rqstp;
622 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
623 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
626 flags = RPCRDMA_DEF_GFP;
627 if (RPC_IS_SWAPPER(task))
628 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
630 if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize,
633 if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize,
637 rqst->rq_buffer = rdmab_data(req->rl_sendbuf);
638 rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf);
639 trace_xprtrdma_op_allocate(task, req);
643 trace_xprtrdma_op_allocate(task, NULL);
648 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
651 * Caller guarantees rqst->rq_buffer is non-NULL.
654 xprt_rdma_free(struct rpc_task *task)
656 struct rpc_rqst *rqst = task->tk_rqstp;
657 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
658 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
660 trace_xprtrdma_op_free(task, req);
662 if (!list_empty(&req->rl_registered))
663 frwr_unmap_sync(r_xprt, req);
665 /* XXX: If the RPC is completing because of a signal and
666 * not because a reply was received, we ought to ensure
667 * that the Send completion has fired, so that memory
668 * involved with the Send is not still visible to the NIC.
673 * xprt_rdma_send_request - marshal and send an RPC request
674 * @rqst: RPC message in rq_snd_buf
676 * Caller holds the transport's write lock.
679 * %0 if the RPC message has been sent
680 * %-ENOTCONN if the caller should reconnect and call again
681 * %-EAGAIN if the caller should call again
682 * %-ENOBUFS if the caller should call again after a delay
683 * %-EMSGSIZE if encoding ran out of buffer space. The request
684 * was not sent. Do not try to send this message again.
685 * %-EIO if an I/O error occurred. The request was not sent.
686 * Do not try to send this message again.
689 xprt_rdma_send_request(struct rpc_rqst *rqst)
691 struct rpc_xprt *xprt = rqst->rq_xprt;
692 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
693 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
696 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
697 if (unlikely(!rqst->rq_buffer))
698 return xprt_rdma_bc_send_reply(rqst);
699 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
701 if (!xprt_connected(xprt))
704 if (!xprt_request_get_cong(xprt, rqst))
707 rc = rpcrdma_marshal_req(r_xprt, rqst);
711 /* Must suppress retransmit to maintain credits */
712 if (rqst->rq_connect_cookie == xprt->connect_cookie)
713 goto drop_connection;
714 rqst->rq_xtime = ktime_get();
716 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
717 goto drop_connection;
719 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
721 /* An RPC with no reply will throw off credit accounting,
722 * so drop the connection to reset the credit grant.
724 if (!rpc_reply_expected(rqst->rq_task))
725 goto drop_connection;
732 xprt_rdma_close(xprt);
736 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
738 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
741 if (xprt_connected(xprt))
742 idle_time = (long)(jiffies - xprt->last_used) / HZ;
744 seq_puts(seq, "\txprt:\trdma ");
745 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
746 0, /* need a local port? */
747 xprt->stat.bind_count,
748 xprt->stat.connect_count,
749 xprt->stat.connect_time / HZ,
756 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
757 r_xprt->rx_stats.read_chunk_count,
758 r_xprt->rx_stats.write_chunk_count,
759 r_xprt->rx_stats.reply_chunk_count,
760 r_xprt->rx_stats.total_rdma_request,
761 r_xprt->rx_stats.total_rdma_reply,
762 r_xprt->rx_stats.pullup_copy_count,
763 r_xprt->rx_stats.fixup_copy_count,
764 r_xprt->rx_stats.hardway_register_count,
765 r_xprt->rx_stats.failed_marshal_count,
766 r_xprt->rx_stats.bad_reply_count,
767 r_xprt->rx_stats.nomsg_call_count);
768 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
769 r_xprt->rx_stats.mrs_recycled,
770 r_xprt->rx_stats.mrs_orphaned,
771 r_xprt->rx_stats.mrs_allocated,
772 r_xprt->rx_stats.local_inv_needed,
773 r_xprt->rx_stats.empty_sendctx_q,
774 r_xprt->rx_stats.reply_waits_for_send);
778 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
784 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
789 * Plumbing for rpc transport switch and kernel module
792 static const struct rpc_xprt_ops xprt_rdma_procs = {
793 .reserve_xprt = xprt_reserve_xprt_cong,
794 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
795 .alloc_slot = xprt_rdma_alloc_slot,
796 .free_slot = xprt_rdma_free_slot,
797 .release_request = xprt_release_rqst_cong, /* ditto */
798 .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */
799 .timer = xprt_rdma_timer,
800 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
801 .set_port = xprt_rdma_set_port,
802 .connect = xprt_rdma_connect,
803 .buf_alloc = xprt_rdma_allocate,
804 .buf_free = xprt_rdma_free,
805 .send_request = xprt_rdma_send_request,
806 .close = xprt_rdma_close,
807 .destroy = xprt_rdma_destroy,
808 .set_connect_timeout = xprt_rdma_tcp_set_connect_timeout,
809 .print_stats = xprt_rdma_print_stats,
810 .enable_swap = xprt_rdma_enable_swap,
811 .disable_swap = xprt_rdma_disable_swap,
812 .inject_disconnect = xprt_rdma_inject_disconnect,
813 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
814 .bc_setup = xprt_rdma_bc_setup,
815 .bc_maxpayload = xprt_rdma_bc_maxpayload,
816 .bc_num_slots = xprt_rdma_bc_max_slots,
817 .bc_free_rqst = xprt_rdma_bc_free_rqst,
818 .bc_destroy = xprt_rdma_bc_destroy,
822 static struct xprt_class xprt_rdma = {
823 .list = LIST_HEAD_INIT(xprt_rdma.list),
825 .owner = THIS_MODULE,
826 .ident = XPRT_TRANSPORT_RDMA,
827 .setup = xprt_setup_rdma,
830 void xprt_rdma_cleanup(void)
832 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
833 if (sunrpc_table_header) {
834 unregister_sysctl_table(sunrpc_table_header);
835 sunrpc_table_header = NULL;
839 xprt_unregister_transport(&xprt_rdma);
840 xprt_unregister_transport(&xprt_rdma_bc);
843 int xprt_rdma_init(void)
847 rc = xprt_register_transport(&xprt_rdma);
851 rc = xprt_register_transport(&xprt_rdma_bc);
853 xprt_unregister_transport(&xprt_rdma);
857 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
858 if (!sunrpc_table_header)
859 sunrpc_table_header = register_sysctl_table(sunrpc_table);