1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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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 static 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_xprt_connect(r_xprt);
244 xprt_clear_connecting(xprt);
246 xprt->connect_cookie++;
247 xprt->stat.connect_count++;
248 xprt->stat.connect_time += (long)jiffies -
249 xprt->stat.connect_start;
250 xprt_set_connected(xprt);
253 /* Force a call to xprt_rdma_close to clean up */
254 spin_lock(&xprt->transport_lock);
255 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
256 spin_unlock(&xprt->transport_lock);
258 xprt_wake_pending_tasks(xprt, rc);
262 * xprt_rdma_inject_disconnect - inject a connection fault
263 * @xprt: transport context
265 * If @xprt is connected, disconnect it to simulate spurious
266 * connection loss. Caller must hold @xprt's send lock to
267 * ensure that data structures and hardware resources are
268 * stable during the rdma_disconnect() call.
271 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
273 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
275 trace_xprtrdma_op_inject_dsc(r_xprt);
276 rdma_disconnect(r_xprt->rx_ep->re_id);
280 * xprt_rdma_destroy - Full tear down of transport
281 * @xprt: doomed transport context
283 * Caller guarantees there will be no more calls to us with
287 xprt_rdma_destroy(struct rpc_xprt *xprt)
289 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
291 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
293 rpcrdma_xprt_disconnect(r_xprt);
294 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
296 xprt_rdma_free_addresses(xprt);
299 module_put(THIS_MODULE);
302 /* 60 second timeout, no retries */
303 static const struct rpc_timeout xprt_rdma_default_timeout = {
304 .to_initval = 60 * HZ,
305 .to_maxval = 60 * HZ,
309 * xprt_setup_rdma - Set up transport to use RDMA
311 * @args: rpc transport arguments
313 static struct rpc_xprt *
314 xprt_setup_rdma(struct xprt_create *args)
316 struct rpc_xprt *xprt;
317 struct rpcrdma_xprt *new_xprt;
318 struct sockaddr *sap;
321 if (args->addrlen > sizeof(xprt->addr))
322 return ERR_PTR(-EBADF);
324 if (!try_module_get(THIS_MODULE))
325 return ERR_PTR(-EIO);
327 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0,
328 xprt_rdma_slot_table_entries);
330 module_put(THIS_MODULE);
331 return ERR_PTR(-ENOMEM);
334 xprt->timeout = &xprt_rdma_default_timeout;
335 xprt->connect_timeout = xprt->timeout->to_initval;
336 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
337 xprt->bind_timeout = RPCRDMA_BIND_TO;
338 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
339 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
341 xprt->resvport = 0; /* privileged port not needed */
342 xprt->ops = &xprt_rdma_procs;
345 * Set up RDMA-specific connect data.
349 /* Ensure xprt->addr holds valid server TCP (not RDMA)
350 * address, for any side protocols which peek at it */
351 xprt->prot = IPPROTO_TCP;
352 xprt->addrlen = args->addrlen;
353 memcpy(&xprt->addr, sap, xprt->addrlen);
355 if (rpc_get_port(sap))
356 xprt_set_bound(xprt);
357 xprt_rdma_format_addresses(xprt, sap);
359 new_xprt = rpcx_to_rdmax(xprt);
360 rc = rpcrdma_buffer_create(new_xprt);
362 xprt_rdma_free_addresses(xprt);
364 module_put(THIS_MODULE);
368 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
369 xprt_rdma_connect_worker);
371 xprt->max_payload = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT;
377 * xprt_rdma_close - close a transport connection
378 * @xprt: transport context
380 * Called during autoclose or device removal.
382 * Caller holds @xprt's send lock to prevent activity on this
383 * transport while the connection is torn down.
385 void xprt_rdma_close(struct rpc_xprt *xprt)
387 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
389 rpcrdma_xprt_disconnect(r_xprt);
391 xprt->reestablish_timeout = 0;
392 ++xprt->connect_cookie;
393 xprt_disconnect_done(xprt);
397 * xprt_rdma_set_port - update server port with rpcbind result
398 * @xprt: controlling RPC transport
399 * @port: new port value
401 * Transport connect status is unchanged.
404 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
406 struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
409 rpc_set_port(sap, port);
411 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
412 snprintf(buf, sizeof(buf), "%u", port);
413 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
415 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
416 snprintf(buf, sizeof(buf), "%4hx", port);
417 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
421 * xprt_rdma_timer - invoked when an RPC times out
422 * @xprt: controlling RPC transport
423 * @task: RPC task that timed out
425 * Invoked when the transport is still connected, but an RPC
426 * retransmit timeout occurs.
428 * Since RDMA connections don't have a keep-alive, forcibly
429 * disconnect and retry to connect. This drives full
430 * detection of the network path, and retransmissions of
434 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
436 xprt_force_disconnect(xprt);
440 * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection
441 * @xprt: controlling transport instance
442 * @connect_timeout: reconnect timeout after client disconnects
443 * @reconnect_timeout: reconnect timeout after server disconnects
446 static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt,
447 unsigned long connect_timeout,
448 unsigned long reconnect_timeout)
450 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
452 trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout);
454 spin_lock(&xprt->transport_lock);
456 if (connect_timeout < xprt->connect_timeout) {
457 struct rpc_timeout to;
458 unsigned long initval;
461 initval = connect_timeout;
462 if (initval < RPCRDMA_INIT_REEST_TO << 1)
463 initval = RPCRDMA_INIT_REEST_TO << 1;
464 to.to_initval = initval;
465 to.to_maxval = initval;
466 r_xprt->rx_timeout = to;
467 xprt->timeout = &r_xprt->rx_timeout;
468 xprt->connect_timeout = connect_timeout;
471 if (reconnect_timeout < xprt->max_reconnect_timeout)
472 xprt->max_reconnect_timeout = reconnect_timeout;
474 spin_unlock(&xprt->transport_lock);
478 * xprt_rdma_connect - schedule an attempt to reconnect
479 * @xprt: transport state
480 * @task: RPC scheduler context (unused)
484 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
486 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
487 struct rpcrdma_ep *ep = r_xprt->rx_ep;
491 if (ep && ep->re_connect_status != 0) {
492 delay = xprt_reconnect_delay(xprt);
493 xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO);
495 trace_xprtrdma_op_connect(r_xprt, delay);
496 queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker,
501 * xprt_rdma_alloc_slot - allocate an rpc_rqst
502 * @xprt: controlling RPC transport
503 * @task: RPC task requesting a fresh rpc_rqst
506 * %0 if task->tk_rqstp points to a fresh rpc_rqst
507 * %-EAGAIN if no rpc_rqst is available; queued on backlog
510 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
512 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
513 struct rpcrdma_req *req;
515 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
518 task->tk_rqstp = &req->rl_slot;
523 task->tk_status = -EAGAIN;
524 xprt_add_backlog(xprt, task);
528 * xprt_rdma_free_slot - release an rpc_rqst
529 * @xprt: controlling RPC transport
530 * @rqst: rpc_rqst to release
534 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
536 struct rpcrdma_xprt *r_xprt =
537 container_of(xprt, struct rpcrdma_xprt, rx_xprt);
539 rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst));
540 if (!xprt_wake_up_backlog(xprt, rqst)) {
541 memset(rqst, 0, sizeof(*rqst));
542 rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst));
546 static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt,
547 struct rpcrdma_regbuf *rb, size_t size,
550 if (unlikely(rdmab_length(rb) < size)) {
551 if (!rpcrdma_regbuf_realloc(rb, size, flags))
553 r_xprt->rx_stats.hardway_register_count += size;
559 * xprt_rdma_allocate - allocate transport resources for an RPC
563 * 0: Success; rq_buffer points to RPC buffer to use
564 * ENOMEM: Out of memory, call again later
565 * EIO: A permanent error occurred, do not retry
568 xprt_rdma_allocate(struct rpc_task *task)
570 struct rpc_rqst *rqst = task->tk_rqstp;
571 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
572 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
575 flags = RPCRDMA_DEF_GFP;
576 if (RPC_IS_SWAPPER(task))
577 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
579 if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize,
582 if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize,
586 rqst->rq_buffer = rdmab_data(req->rl_sendbuf);
587 rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf);
595 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
598 * Caller guarantees rqst->rq_buffer is non-NULL.
601 xprt_rdma_free(struct rpc_task *task)
603 struct rpc_rqst *rqst = task->tk_rqstp;
604 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
606 if (unlikely(!list_empty(&req->rl_registered))) {
607 trace_xprtrdma_mrs_zap(task);
608 frwr_unmap_sync(rpcx_to_rdmax(rqst->rq_xprt), req);
611 /* XXX: If the RPC is completing because of a signal and
612 * not because a reply was received, we ought to ensure
613 * that the Send completion has fired, so that memory
614 * involved with the Send is not still visible to the NIC.
619 * xprt_rdma_send_request - marshal and send an RPC request
620 * @rqst: RPC message in rq_snd_buf
622 * Caller holds the transport's write lock.
625 * %0 if the RPC message has been sent
626 * %-ENOTCONN if the caller should reconnect and call again
627 * %-EAGAIN if the caller should call again
628 * %-ENOBUFS if the caller should call again after a delay
629 * %-EMSGSIZE if encoding ran out of buffer space. The request
630 * was not sent. Do not try to send this message again.
631 * %-EIO if an I/O error occurred. The request was not sent.
632 * Do not try to send this message again.
635 xprt_rdma_send_request(struct rpc_rqst *rqst)
637 struct rpc_xprt *xprt = rqst->rq_xprt;
638 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
639 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
642 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
643 if (unlikely(!rqst->rq_buffer))
644 return xprt_rdma_bc_send_reply(rqst);
645 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
647 if (!xprt_connected(xprt))
650 if (!xprt_request_get_cong(xprt, rqst))
653 rc = rpcrdma_marshal_req(r_xprt, rqst);
657 /* Must suppress retransmit to maintain credits */
658 if (rqst->rq_connect_cookie == xprt->connect_cookie)
659 goto drop_connection;
660 rqst->rq_xtime = ktime_get();
662 if (rpcrdma_post_sends(r_xprt, req))
663 goto drop_connection;
665 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
667 /* An RPC with no reply will throw off credit accounting,
668 * so drop the connection to reset the credit grant.
670 if (!rpc_reply_expected(rqst->rq_task))
671 goto drop_connection;
678 xprt_rdma_close(xprt);
682 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
684 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
687 if (xprt_connected(xprt))
688 idle_time = (long)(jiffies - xprt->last_used) / HZ;
690 seq_puts(seq, "\txprt:\trdma ");
691 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
692 0, /* need a local port? */
693 xprt->stat.bind_count,
694 xprt->stat.connect_count,
695 xprt->stat.connect_time / HZ,
702 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
703 r_xprt->rx_stats.read_chunk_count,
704 r_xprt->rx_stats.write_chunk_count,
705 r_xprt->rx_stats.reply_chunk_count,
706 r_xprt->rx_stats.total_rdma_request,
707 r_xprt->rx_stats.total_rdma_reply,
708 r_xprt->rx_stats.pullup_copy_count,
709 r_xprt->rx_stats.fixup_copy_count,
710 r_xprt->rx_stats.hardway_register_count,
711 r_xprt->rx_stats.failed_marshal_count,
712 r_xprt->rx_stats.bad_reply_count,
713 r_xprt->rx_stats.nomsg_call_count);
714 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
715 r_xprt->rx_stats.mrs_recycled,
716 r_xprt->rx_stats.mrs_orphaned,
717 r_xprt->rx_stats.mrs_allocated,
718 r_xprt->rx_stats.local_inv_needed,
719 r_xprt->rx_stats.empty_sendctx_q,
720 r_xprt->rx_stats.reply_waits_for_send);
724 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
730 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
735 * Plumbing for rpc transport switch and kernel module
738 static const struct rpc_xprt_ops xprt_rdma_procs = {
739 .reserve_xprt = xprt_reserve_xprt_cong,
740 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
741 .alloc_slot = xprt_rdma_alloc_slot,
742 .free_slot = xprt_rdma_free_slot,
743 .release_request = xprt_release_rqst_cong, /* ditto */
744 .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */
745 .timer = xprt_rdma_timer,
746 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
747 .set_port = xprt_rdma_set_port,
748 .connect = xprt_rdma_connect,
749 .buf_alloc = xprt_rdma_allocate,
750 .buf_free = xprt_rdma_free,
751 .send_request = xprt_rdma_send_request,
752 .close = xprt_rdma_close,
753 .destroy = xprt_rdma_destroy,
754 .set_connect_timeout = xprt_rdma_set_connect_timeout,
755 .print_stats = xprt_rdma_print_stats,
756 .enable_swap = xprt_rdma_enable_swap,
757 .disable_swap = xprt_rdma_disable_swap,
758 .inject_disconnect = xprt_rdma_inject_disconnect,
759 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
760 .bc_setup = xprt_rdma_bc_setup,
761 .bc_maxpayload = xprt_rdma_bc_maxpayload,
762 .bc_num_slots = xprt_rdma_bc_max_slots,
763 .bc_free_rqst = xprt_rdma_bc_free_rqst,
764 .bc_destroy = xprt_rdma_bc_destroy,
768 static struct xprt_class xprt_rdma = {
769 .list = LIST_HEAD_INIT(xprt_rdma.list),
771 .owner = THIS_MODULE,
772 .ident = XPRT_TRANSPORT_RDMA,
773 .setup = xprt_setup_rdma,
774 .netid = { "rdma", "rdma6", "" },
777 void xprt_rdma_cleanup(void)
779 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
780 if (sunrpc_table_header) {
781 unregister_sysctl_table(sunrpc_table_header);
782 sunrpc_table_header = NULL;
786 xprt_unregister_transport(&xprt_rdma);
787 xprt_unregister_transport(&xprt_rdma_bc);
790 int xprt_rdma_init(void)
794 rc = xprt_register_transport(&xprt_rdma);
798 rc = xprt_register_transport(&xprt_rdma_bc);
800 xprt_unregister_transport(&xprt_rdma);
804 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
805 if (!sunrpc_table_header)
806 sunrpc_table_header = register_sysctl_table(sunrpc_table);