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3 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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44 * This file contains the top-level implementation of an RPC RDMA
47 * Naming convention: functions beginning with xprt_ are part of the
48 * transport switch. All others are RPC RDMA internal.
51 #include <linux/module.h>
52 #include <linux/slab.h>
53 #include <linux/seq_file.h>
54 #include <linux/sunrpc/addr.h>
56 #include "xprt_rdma.h"
58 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
59 # define RPCDBG_FACILITY RPCDBG_TRANS
66 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
67 unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
68 static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
69 unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR;
70 int xprt_rdma_pad_optimize;
72 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
74 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
75 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
76 static unsigned int min_inline_size = RPCRDMA_MIN_INLINE;
77 static unsigned int max_inline_size = RPCRDMA_MAX_INLINE;
78 static unsigned int zero;
79 static unsigned int max_padding = PAGE_SIZE;
80 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
81 static unsigned int max_memreg = RPCRDMA_LAST - 1;
82 static unsigned int dummy;
84 static struct ctl_table_header *sunrpc_table_header;
86 static struct ctl_table xr_tunables_table[] = {
88 .procname = "rdma_slot_table_entries",
89 .data = &xprt_rdma_slot_table_entries,
90 .maxlen = sizeof(unsigned int),
92 .proc_handler = proc_dointvec_minmax,
93 .extra1 = &min_slot_table_size,
94 .extra2 = &max_slot_table_size
97 .procname = "rdma_max_inline_read",
98 .data = &xprt_rdma_max_inline_read,
99 .maxlen = sizeof(unsigned int),
101 .proc_handler = proc_dointvec_minmax,
102 .extra1 = &min_inline_size,
103 .extra2 = &max_inline_size,
106 .procname = "rdma_max_inline_write",
107 .data = &xprt_rdma_max_inline_write,
108 .maxlen = sizeof(unsigned int),
110 .proc_handler = proc_dointvec_minmax,
111 .extra1 = &min_inline_size,
112 .extra2 = &max_inline_size,
115 .procname = "rdma_inline_write_padding",
117 .maxlen = sizeof(unsigned int),
119 .proc_handler = proc_dointvec_minmax,
121 .extra2 = &max_padding,
124 .procname = "rdma_memreg_strategy",
125 .data = &xprt_rdma_memreg_strategy,
126 .maxlen = sizeof(unsigned int),
128 .proc_handler = proc_dointvec_minmax,
129 .extra1 = &min_memreg,
130 .extra2 = &max_memreg,
133 .procname = "rdma_pad_optimize",
134 .data = &xprt_rdma_pad_optimize,
135 .maxlen = sizeof(unsigned int),
137 .proc_handler = proc_dointvec,
142 static struct ctl_table sunrpc_table[] = {
144 .procname = "sunrpc",
146 .child = xr_tunables_table
153 static const struct rpc_xprt_ops xprt_rdma_procs;
156 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
158 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
161 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
162 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
164 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
168 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
170 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
173 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
174 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
176 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
180 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap)
184 switch (sap->sa_family) {
186 xprt_rdma_format_addresses4(xprt, sap);
189 xprt_rdma_format_addresses6(xprt, sap);
192 pr_err("rpcrdma: Unrecognized address family\n");
196 (void)rpc_ntop(sap, buf, sizeof(buf));
197 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
199 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
200 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
202 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
203 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
205 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
209 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
213 for (i = 0; i < RPC_DISPLAY_MAX; i++)
215 case RPC_DISPLAY_PROTO:
216 case RPC_DISPLAY_NETID:
219 kfree(xprt->address_strings[i]);
224 rpcrdma_conn_func(struct rpcrdma_ep *ep)
226 schedule_delayed_work(&ep->rep_connect_worker, 0);
230 rpcrdma_connect_worker(struct work_struct *work)
232 struct rpcrdma_ep *ep =
233 container_of(work, struct rpcrdma_ep, rep_connect_worker.work);
234 struct rpcrdma_xprt *r_xprt =
235 container_of(ep, struct rpcrdma_xprt, rx_ep);
236 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
238 spin_lock_bh(&xprt->transport_lock);
239 if (ep->rep_connected > 0) {
240 if (!xprt_test_and_set_connected(xprt))
241 xprt_wake_pending_tasks(xprt, 0);
243 if (xprt_test_and_clear_connected(xprt))
244 xprt_wake_pending_tasks(xprt, -ENOTCONN);
246 spin_unlock_bh(&xprt->transport_lock);
250 xprt_rdma_connect_worker(struct work_struct *work)
252 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
253 rx_connect_worker.work);
254 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
257 xprt_clear_connected(xprt);
259 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
261 xprt_wake_pending_tasks(xprt, rc);
263 xprt_clear_connecting(xprt);
267 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
269 struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt,
272 trace_xprtrdma_inject_dsc(r_xprt);
273 rdma_disconnect(r_xprt->rx_ia.ri_id);
280 * Free all memory associated with the object, including its own.
281 * NOTE: none of the *destroy methods free memory for their top-level
282 * objects, even though they may have allocated it (they do free
283 * private memory). It's up to the caller to handle it. In this
284 * case (RDMA transport), all structure memory is inlined with the
285 * struct rpcrdma_xprt.
288 xprt_rdma_destroy(struct rpc_xprt *xprt)
290 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
292 trace_xprtrdma_destroy(r_xprt);
294 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
296 xprt_clear_connected(xprt);
298 rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
299 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
300 rpcrdma_ia_close(&r_xprt->rx_ia);
302 xprt_rdma_free_addresses(xprt);
305 module_put(THIS_MODULE);
308 static const struct rpc_timeout xprt_rdma_default_timeout = {
309 .to_initval = 60 * HZ,
310 .to_maxval = 60 * HZ,
314 * xprt_setup_rdma - Set up transport to use RDMA
316 * @args: rpc transport arguments
318 static struct rpc_xprt *
319 xprt_setup_rdma(struct xprt_create *args)
321 struct rpcrdma_create_data_internal cdata;
322 struct rpc_xprt *xprt;
323 struct rpcrdma_xprt *new_xprt;
324 struct rpcrdma_ep *new_ep;
325 struct sockaddr *sap;
328 if (args->addrlen > sizeof(xprt->addr)) {
329 dprintk("RPC: %s: address too large\n", __func__);
330 return ERR_PTR(-EBADF);
333 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
334 xprt_rdma_slot_table_entries,
335 xprt_rdma_slot_table_entries);
337 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
339 return ERR_PTR(-ENOMEM);
342 /* 60 second timeout, no retries */
343 xprt->timeout = &xprt_rdma_default_timeout;
344 xprt->bind_timeout = RPCRDMA_BIND_TO;
345 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
346 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
348 xprt->resvport = 0; /* privileged port not needed */
349 xprt->tsh_size = 0; /* RPC-RDMA handles framing */
350 xprt->ops = &xprt_rdma_procs;
353 * Set up RDMA-specific connect data.
357 /* Ensure xprt->addr holds valid server TCP (not RDMA)
358 * address, for any side protocols which peek at it */
359 xprt->prot = IPPROTO_TCP;
360 xprt->addrlen = args->addrlen;
361 memcpy(&xprt->addr, sap, xprt->addrlen);
363 if (rpc_get_port(sap))
364 xprt_set_bound(xprt);
365 xprt_rdma_format_addresses(xprt, sap);
367 cdata.max_requests = xprt->max_reqs;
369 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
370 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
372 cdata.inline_wsize = xprt_rdma_max_inline_write;
373 if (cdata.inline_wsize > cdata.wsize)
374 cdata.inline_wsize = cdata.wsize;
376 cdata.inline_rsize = xprt_rdma_max_inline_read;
377 if (cdata.inline_rsize > cdata.rsize)
378 cdata.inline_rsize = cdata.rsize;
381 * Create new transport instance, which includes initialized
387 new_xprt = rpcx_to_rdmax(xprt);
389 rc = rpcrdma_ia_open(new_xprt);
394 * initialize and create ep
396 new_xprt->rx_data = cdata;
397 new_ep = &new_xprt->rx_ep;
399 rc = rpcrdma_ep_create(&new_xprt->rx_ep,
400 &new_xprt->rx_ia, &new_xprt->rx_data);
404 rc = rpcrdma_buffer_create(new_xprt);
408 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
409 xprt_rdma_connect_worker);
411 xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
412 if (xprt->max_payload == 0)
414 xprt->max_payload <<= PAGE_SHIFT;
415 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
416 __func__, xprt->max_payload);
418 if (!try_module_get(THIS_MODULE))
421 dprintk("RPC: %s: %s:%s\n", __func__,
422 xprt->address_strings[RPC_DISPLAY_ADDR],
423 xprt->address_strings[RPC_DISPLAY_PORT]);
424 trace_xprtrdma_create(new_xprt);
428 rpcrdma_buffer_destroy(&new_xprt->rx_buf);
431 rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
433 rpcrdma_ia_close(&new_xprt->rx_ia);
435 trace_xprtrdma_destroy(new_xprt);
436 xprt_rdma_free_addresses(xprt);
442 * xprt_rdma_close - Close down RDMA connection
443 * @xprt: generic transport to be closed
445 * Called during transport shutdown reconnect, or device
446 * removal. Caller holds the transport's write lock.
449 xprt_rdma_close(struct rpc_xprt *xprt)
451 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
452 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
453 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
455 dprintk("RPC: %s: closing xprt %p\n", __func__, xprt);
457 if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
458 xprt_clear_connected(xprt);
459 rpcrdma_ia_remove(ia);
462 if (ep->rep_connected == -ENODEV)
464 if (ep->rep_connected > 0)
465 xprt->reestablish_timeout = 0;
466 xprt_disconnect_done(xprt);
467 rpcrdma_ep_disconnect(ep, ia);
471 * xprt_rdma_set_port - update server port with rpcbind result
472 * @xprt: controlling RPC transport
473 * @port: new port value
475 * Transport connect status is unchanged.
478 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
480 struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
483 dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n",
485 xprt->address_strings[RPC_DISPLAY_ADDR],
486 xprt->address_strings[RPC_DISPLAY_PORT],
489 rpc_set_port(sap, port);
491 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
492 snprintf(buf, sizeof(buf), "%u", port);
493 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
495 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
496 snprintf(buf, sizeof(buf), "%4hx", port);
497 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
501 * xprt_rdma_timer - invoked when an RPC times out
502 * @xprt: controlling RPC transport
503 * @task: RPC task that timed out
505 * Invoked when the transport is still connected, but an RPC
506 * retransmit timeout occurs.
508 * Since RDMA connections don't have a keep-alive, forcibly
509 * disconnect and retry to connect. This drives full
510 * detection of the network path, and retransmissions of
514 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
516 xprt_force_disconnect(xprt);
520 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
522 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
524 if (r_xprt->rx_ep.rep_connected != 0) {
526 schedule_delayed_work(&r_xprt->rx_connect_worker,
527 xprt->reestablish_timeout);
528 xprt->reestablish_timeout <<= 1;
529 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
530 xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
531 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
532 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
534 schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
535 if (!RPC_IS_ASYNC(task))
536 flush_delayed_work(&r_xprt->rx_connect_worker);
541 rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
542 size_t size, gfp_t flags)
544 struct rpcrdma_regbuf *rb;
546 if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size)
549 rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags);
553 rpcrdma_free_regbuf(req->rl_sendbuf);
554 r_xprt->rx_stats.hardway_register_count += size;
555 req->rl_sendbuf = rb;
559 /* The rq_rcv_buf is used only if a Reply chunk is necessary.
560 * The decision to use a Reply chunk is made later in
561 * rpcrdma_marshal_req. This buffer is registered at that time.
563 * Otherwise, the associated RPC Reply arrives in a separate
564 * Receive buffer, arbitrarily chosen by the HCA. The buffer
565 * allocated here for the RPC Reply is not utilized in that
566 * case. See rpcrdma_inline_fixup.
568 * A regbuf is used here to remember the buffer size.
571 rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
572 size_t size, gfp_t flags)
574 struct rpcrdma_regbuf *rb;
576 if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size)
579 rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags);
583 rpcrdma_free_regbuf(req->rl_recvbuf);
584 r_xprt->rx_stats.hardway_register_count += size;
585 req->rl_recvbuf = rb;
590 * xprt_rdma_allocate - allocate transport resources for an RPC
594 * 0: Success; rq_buffer points to RPC buffer to use
595 * ENOMEM: Out of memory, call again later
596 * EIO: A permanent error occurred, do not retry
598 * The RDMA allocate/free functions need the task structure as a place
599 * to hide the struct rpcrdma_req, which is necessary for the actual
600 * send/recv sequence.
602 * xprt_rdma_allocate provides buffers that are already mapped for
603 * DMA, and a local DMA lkey is provided for each.
606 xprt_rdma_allocate(struct rpc_task *task)
608 struct rpc_rqst *rqst = task->tk_rqstp;
609 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
610 struct rpcrdma_req *req;
613 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
617 flags = RPCRDMA_DEF_GFP;
618 if (RPC_IS_SWAPPER(task))
619 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
621 if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags))
623 if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
626 rpcrdma_set_xprtdata(rqst, req);
627 rqst->rq_buffer = req->rl_sendbuf->rg_base;
628 rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
629 trace_xprtrdma_allocate(task, req);
633 rpcrdma_buffer_put(req);
635 trace_xprtrdma_allocate(task, NULL);
640 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
643 * Caller guarantees rqst->rq_buffer is non-NULL.
646 xprt_rdma_free(struct rpc_task *task)
648 struct rpc_rqst *rqst = task->tk_rqstp;
649 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
650 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
652 if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
653 rpcrdma_release_rqst(r_xprt, req);
654 trace_xprtrdma_rpc_done(task, req);
655 rpcrdma_buffer_put(req);
659 * xprt_rdma_send_request - marshal and send an RPC request
660 * @task: RPC task with an RPC message in rq_snd_buf
662 * Caller holds the transport's write lock.
665 * %0 if the RPC message has been sent
666 * %-ENOTCONN if the caller should reconnect and call again
667 * %-EAGAIN if the caller should call again
668 * %-ENOBUFS if the caller should call again after a delay
669 * %-EIO if a permanent error occurred and the request was not
670 * sent. Do not try to send this message again.
673 xprt_rdma_send_request(struct rpc_task *task)
675 struct rpc_rqst *rqst = task->tk_rqstp;
676 struct rpc_xprt *xprt = rqst->rq_xprt;
677 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
678 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
681 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
682 if (unlikely(!rqst->rq_buffer))
683 return xprt_rdma_bc_send_reply(rqst);
684 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
686 if (!xprt_connected(xprt))
687 goto drop_connection;
689 rc = rpcrdma_marshal_req(r_xprt, rqst);
693 if (req->rl_reply == NULL) /* e.g. reconnection */
694 rpcrdma_recv_buffer_get(req);
696 /* Must suppress retransmit to maintain credits */
697 if (rqst->rq_connect_cookie == xprt->connect_cookie)
698 goto drop_connection;
699 rqst->rq_xtime = ktime_get();
701 __set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
702 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
703 goto drop_connection;
705 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
706 rqst->rq_bytes_sent = 0;
708 /* An RPC with no reply will throw off credit accounting,
709 * so drop the connection to reset the credit grant.
711 if (!rpc_reply_expected(task))
712 goto drop_connection;
719 xprt_disconnect_done(xprt);
720 return -ENOTCONN; /* implies disconnect */
723 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
725 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
728 if (xprt_connected(xprt))
729 idle_time = (long)(jiffies - xprt->last_used) / HZ;
731 seq_puts(seq, "\txprt:\trdma ");
732 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
733 0, /* need a local port? */
734 xprt->stat.bind_count,
735 xprt->stat.connect_count,
736 xprt->stat.connect_time,
743 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
744 r_xprt->rx_stats.read_chunk_count,
745 r_xprt->rx_stats.write_chunk_count,
746 r_xprt->rx_stats.reply_chunk_count,
747 r_xprt->rx_stats.total_rdma_request,
748 r_xprt->rx_stats.total_rdma_reply,
749 r_xprt->rx_stats.pullup_copy_count,
750 r_xprt->rx_stats.fixup_copy_count,
751 r_xprt->rx_stats.hardway_register_count,
752 r_xprt->rx_stats.failed_marshal_count,
753 r_xprt->rx_stats.bad_reply_count,
754 r_xprt->rx_stats.nomsg_call_count);
755 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
756 r_xprt->rx_stats.mrs_recovered,
757 r_xprt->rx_stats.mrs_orphaned,
758 r_xprt->rx_stats.mrs_allocated,
759 r_xprt->rx_stats.local_inv_needed,
760 r_xprt->rx_stats.empty_sendctx_q,
761 r_xprt->rx_stats.reply_waits_for_send);
765 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
771 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
776 * Plumbing for rpc transport switch and kernel module
779 static const struct rpc_xprt_ops xprt_rdma_procs = {
780 .reserve_xprt = xprt_reserve_xprt_cong,
781 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
782 .alloc_slot = xprt_alloc_slot,
783 .release_request = xprt_release_rqst_cong, /* ditto */
784 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
785 .timer = xprt_rdma_timer,
786 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
787 .set_port = xprt_rdma_set_port,
788 .connect = xprt_rdma_connect,
789 .buf_alloc = xprt_rdma_allocate,
790 .buf_free = xprt_rdma_free,
791 .send_request = xprt_rdma_send_request,
792 .close = xprt_rdma_close,
793 .destroy = xprt_rdma_destroy,
794 .print_stats = xprt_rdma_print_stats,
795 .enable_swap = xprt_rdma_enable_swap,
796 .disable_swap = xprt_rdma_disable_swap,
797 .inject_disconnect = xprt_rdma_inject_disconnect,
798 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
799 .bc_setup = xprt_rdma_bc_setup,
800 .bc_up = xprt_rdma_bc_up,
801 .bc_maxpayload = xprt_rdma_bc_maxpayload,
802 .bc_free_rqst = xprt_rdma_bc_free_rqst,
803 .bc_destroy = xprt_rdma_bc_destroy,
807 static struct xprt_class xprt_rdma = {
808 .list = LIST_HEAD_INIT(xprt_rdma.list),
810 .owner = THIS_MODULE,
811 .ident = XPRT_TRANSPORT_RDMA,
812 .setup = xprt_setup_rdma,
815 void xprt_rdma_cleanup(void)
819 dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
820 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
821 if (sunrpc_table_header) {
822 unregister_sysctl_table(sunrpc_table_header);
823 sunrpc_table_header = NULL;
826 rc = xprt_unregister_transport(&xprt_rdma);
828 dprintk("RPC: %s: xprt_unregister returned %i\n",
831 rpcrdma_destroy_wq();
833 rc = xprt_unregister_transport(&xprt_rdma_bc);
835 dprintk("RPC: %s: xprt_unregister(bc) returned %i\n",
839 int xprt_rdma_init(void)
843 rc = rpcrdma_alloc_wq();
847 rc = xprt_register_transport(&xprt_rdma);
849 rpcrdma_destroy_wq();
853 rc = xprt_register_transport(&xprt_rdma_bc);
855 xprt_unregister_transport(&xprt_rdma);
856 rpcrdma_destroy_wq();
860 dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
862 dprintk("Defaults:\n");
863 dprintk("\tSlots %d\n"
864 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
865 xprt_rdma_slot_table_entries,
866 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
867 dprintk("\tPadding 0\n\tMemreg %d\n", xprt_rdma_memreg_strategy);
869 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
870 if (!sunrpc_table_header)
871 sunrpc_table_header = register_sysctl_table(sunrpc_table);