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
7 * licenses. You may choose to be licensed under the terms of the GNU
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
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
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22 * with the distribution.
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38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 static 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 zero;
84 static unsigned int max_padding = PAGE_SIZE;
85 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
86 static unsigned int max_memreg = RPCRDMA_LAST - 1;
87 static unsigned int dummy;
89 static struct ctl_table_header *sunrpc_table_header;
91 static struct ctl_table xr_tunables_table[] = {
93 .procname = "rdma_slot_table_entries",
94 .data = &xprt_rdma_slot_table_entries,
95 .maxlen = sizeof(unsigned int),
97 .proc_handler = proc_dointvec_minmax,
98 .extra1 = &min_slot_table_size,
99 .extra2 = &max_slot_table_size
102 .procname = "rdma_max_inline_read",
103 .data = &xprt_rdma_max_inline_read,
104 .maxlen = sizeof(unsigned int),
106 .proc_handler = proc_dointvec_minmax,
107 .extra1 = &min_inline_size,
108 .extra2 = &max_inline_size,
111 .procname = "rdma_max_inline_write",
112 .data = &xprt_rdma_max_inline_write,
113 .maxlen = sizeof(unsigned int),
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &min_inline_size,
117 .extra2 = &max_inline_size,
120 .procname = "rdma_inline_write_padding",
122 .maxlen = sizeof(unsigned int),
124 .proc_handler = proc_dointvec_minmax,
126 .extra2 = &max_padding,
129 .procname = "rdma_memreg_strategy",
130 .data = &xprt_rdma_memreg_strategy,
131 .maxlen = sizeof(unsigned int),
133 .proc_handler = proc_dointvec_minmax,
134 .extra1 = &min_memreg,
135 .extra2 = &max_memreg,
138 .procname = "rdma_pad_optimize",
139 .data = &xprt_rdma_pad_optimize,
140 .maxlen = sizeof(unsigned int),
142 .proc_handler = proc_dointvec,
147 static struct ctl_table sunrpc_table[] = {
149 .procname = "sunrpc",
151 .child = xr_tunables_table
158 static const struct rpc_xprt_ops xprt_rdma_procs;
161 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
163 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
166 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
167 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
169 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
173 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
175 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
178 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
179 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
181 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
185 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap)
189 switch (sap->sa_family) {
191 xprt_rdma_format_addresses4(xprt, sap);
194 xprt_rdma_format_addresses6(xprt, sap);
197 pr_err("rpcrdma: Unrecognized address family\n");
201 (void)rpc_ntop(sap, buf, sizeof(buf));
202 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
204 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
205 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
207 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
208 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
210 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
214 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
218 for (i = 0; i < RPC_DISPLAY_MAX; i++)
220 case RPC_DISPLAY_PROTO:
221 case RPC_DISPLAY_NETID:
224 kfree(xprt->address_strings[i]);
229 rpcrdma_conn_func(struct rpcrdma_ep *ep)
231 schedule_delayed_work(&ep->rep_connect_worker, 0);
235 rpcrdma_connect_worker(struct work_struct *work)
237 struct rpcrdma_ep *ep =
238 container_of(work, struct rpcrdma_ep, rep_connect_worker.work);
239 struct rpcrdma_xprt *r_xprt =
240 container_of(ep, struct rpcrdma_xprt, rx_ep);
241 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
243 spin_lock_bh(&xprt->transport_lock);
244 if (ep->rep_connected > 0) {
245 if (!xprt_test_and_set_connected(xprt))
246 xprt_wake_pending_tasks(xprt, 0);
248 if (xprt_test_and_clear_connected(xprt))
249 xprt_wake_pending_tasks(xprt, -ENOTCONN);
251 spin_unlock_bh(&xprt->transport_lock);
255 xprt_rdma_connect_worker(struct work_struct *work)
257 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
258 rx_connect_worker.work);
259 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
262 xprt_clear_connected(xprt);
264 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
266 xprt_wake_pending_tasks(xprt, rc);
268 xprt_clear_connecting(xprt);
272 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
274 struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt,
277 trace_xprtrdma_inject_dsc(r_xprt);
278 rdma_disconnect(r_xprt->rx_ia.ri_id);
285 * Free all memory associated with the object, including its own.
286 * NOTE: none of the *destroy methods free memory for their top-level
287 * objects, even though they may have allocated it (they do free
288 * private memory). It's up to the caller to handle it. In this
289 * case (RDMA transport), all structure memory is inlined with the
290 * struct rpcrdma_xprt.
293 xprt_rdma_destroy(struct rpc_xprt *xprt)
295 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
297 trace_xprtrdma_destroy(r_xprt);
299 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
301 xprt_clear_connected(xprt);
303 rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
304 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
305 rpcrdma_ia_close(&r_xprt->rx_ia);
307 xprt_rdma_free_addresses(xprt);
310 module_put(THIS_MODULE);
313 static const struct rpc_timeout xprt_rdma_default_timeout = {
314 .to_initval = 60 * HZ,
315 .to_maxval = 60 * HZ,
319 * xprt_setup_rdma - Set up transport to use RDMA
321 * @args: rpc transport arguments
323 static struct rpc_xprt *
324 xprt_setup_rdma(struct xprt_create *args)
326 struct rpcrdma_create_data_internal cdata;
327 struct rpc_xprt *xprt;
328 struct rpcrdma_xprt *new_xprt;
329 struct rpcrdma_ep *new_ep;
330 struct sockaddr *sap;
333 if (args->addrlen > sizeof(xprt->addr)) {
334 dprintk("RPC: %s: address too large\n", __func__);
335 return ERR_PTR(-EBADF);
338 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 0);
340 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
342 return ERR_PTR(-ENOMEM);
345 /* 60 second timeout, no retries */
346 xprt->timeout = &xprt_rdma_default_timeout;
347 xprt->bind_timeout = RPCRDMA_BIND_TO;
348 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
349 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
351 xprt->resvport = 0; /* privileged port not needed */
352 xprt->tsh_size = 0; /* RPC-RDMA handles framing */
353 xprt->ops = &xprt_rdma_procs;
356 * Set up RDMA-specific connect data.
360 /* Ensure xprt->addr holds valid server TCP (not RDMA)
361 * address, for any side protocols which peek at it */
362 xprt->prot = IPPROTO_TCP;
363 xprt->addrlen = args->addrlen;
364 memcpy(&xprt->addr, sap, xprt->addrlen);
366 if (rpc_get_port(sap))
367 xprt_set_bound(xprt);
368 xprt_rdma_format_addresses(xprt, sap);
370 cdata.max_requests = xprt_rdma_slot_table_entries;
372 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
373 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
375 cdata.inline_wsize = xprt_rdma_max_inline_write;
376 if (cdata.inline_wsize > cdata.wsize)
377 cdata.inline_wsize = cdata.wsize;
379 cdata.inline_rsize = xprt_rdma_max_inline_read;
380 if (cdata.inline_rsize > cdata.rsize)
381 cdata.inline_rsize = cdata.rsize;
384 * Create new transport instance, which includes initialized
390 new_xprt = rpcx_to_rdmax(xprt);
392 rc = rpcrdma_ia_open(new_xprt);
397 * initialize and create ep
399 new_xprt->rx_data = cdata;
400 new_ep = &new_xprt->rx_ep;
402 rc = rpcrdma_ep_create(&new_xprt->rx_ep,
403 &new_xprt->rx_ia, &new_xprt->rx_data);
407 rc = rpcrdma_buffer_create(new_xprt);
411 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
412 xprt_rdma_connect_worker);
414 xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
415 if (xprt->max_payload == 0)
417 xprt->max_payload <<= PAGE_SHIFT;
418 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
419 __func__, xprt->max_payload);
421 if (!try_module_get(THIS_MODULE))
424 dprintk("RPC: %s: %s:%s\n", __func__,
425 xprt->address_strings[RPC_DISPLAY_ADDR],
426 xprt->address_strings[RPC_DISPLAY_PORT]);
427 trace_xprtrdma_create(new_xprt);
431 rpcrdma_buffer_destroy(&new_xprt->rx_buf);
434 rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
436 rpcrdma_ia_close(&new_xprt->rx_ia);
438 trace_xprtrdma_destroy(new_xprt);
439 xprt_rdma_free_addresses(xprt);
445 * xprt_rdma_close - Close down RDMA connection
446 * @xprt: generic transport to be closed
448 * Called during transport shutdown reconnect, or device
449 * removal. Caller holds the transport's write lock.
452 xprt_rdma_close(struct rpc_xprt *xprt)
454 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
455 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
456 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
458 dprintk("RPC: %s: closing xprt %p\n", __func__, xprt);
460 if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
461 xprt_clear_connected(xprt);
462 rpcrdma_ia_remove(ia);
465 if (ep->rep_connected == -ENODEV)
467 if (ep->rep_connected > 0)
468 xprt->reestablish_timeout = 0;
469 xprt_disconnect_done(xprt);
470 rpcrdma_ep_disconnect(ep, ia);
472 /* Prepare @xprt for the next connection by reinitializing
473 * its credit grant to one (see RFC 8166, Section 3.3.3).
475 r_xprt->rx_buf.rb_credits = 1;
476 xprt->cwnd = RPC_CWNDSHIFT;
480 * xprt_rdma_set_port - update server port with rpcbind result
481 * @xprt: controlling RPC transport
482 * @port: new port value
484 * Transport connect status is unchanged.
487 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
489 struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
492 dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n",
494 xprt->address_strings[RPC_DISPLAY_ADDR],
495 xprt->address_strings[RPC_DISPLAY_PORT],
498 rpc_set_port(sap, port);
500 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
501 snprintf(buf, sizeof(buf), "%u", port);
502 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
504 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
505 snprintf(buf, sizeof(buf), "%4hx", port);
506 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
510 * xprt_rdma_timer - invoked when an RPC times out
511 * @xprt: controlling RPC transport
512 * @task: RPC task that timed out
514 * Invoked when the transport is still connected, but an RPC
515 * retransmit timeout occurs.
517 * Since RDMA connections don't have a keep-alive, forcibly
518 * disconnect and retry to connect. This drives full
519 * detection of the network path, and retransmissions of
523 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
525 xprt_force_disconnect(xprt);
529 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
531 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
533 if (r_xprt->rx_ep.rep_connected != 0) {
535 schedule_delayed_work(&r_xprt->rx_connect_worker,
536 xprt->reestablish_timeout);
537 xprt->reestablish_timeout <<= 1;
538 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
539 xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
540 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
541 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
543 schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
544 if (!RPC_IS_ASYNC(task))
545 flush_delayed_work(&r_xprt->rx_connect_worker);
550 * xprt_rdma_alloc_slot - allocate an rpc_rqst
551 * @xprt: controlling RPC transport
552 * @task: RPC task requesting a fresh rpc_rqst
555 * %0 if task->tk_rqstp points to a fresh rpc_rqst
556 * %-EAGAIN if no rpc_rqst is available; queued on backlog
559 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
561 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
562 struct rpcrdma_req *req;
564 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
567 task->tk_rqstp = &req->rl_slot;
572 rpc_sleep_on(&xprt->backlog, task, NULL);
573 task->tk_status = -EAGAIN;
577 * xprt_rdma_free_slot - release an rpc_rqst
578 * @xprt: controlling RPC transport
579 * @rqst: rpc_rqst to release
583 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
585 memset(rqst, 0, sizeof(*rqst));
586 rpcrdma_buffer_put(rpcr_to_rdmar(rqst));
587 rpc_wake_up_next(&xprt->backlog);
591 rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
592 size_t size, gfp_t flags)
594 struct rpcrdma_regbuf *rb;
596 if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size)
599 rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags);
603 rpcrdma_free_regbuf(req->rl_sendbuf);
604 r_xprt->rx_stats.hardway_register_count += size;
605 req->rl_sendbuf = rb;
609 /* The rq_rcv_buf is used only if a Reply chunk is necessary.
610 * The decision to use a Reply chunk is made later in
611 * rpcrdma_marshal_req. This buffer is registered at that time.
613 * Otherwise, the associated RPC Reply arrives in a separate
614 * Receive buffer, arbitrarily chosen by the HCA. The buffer
615 * allocated here for the RPC Reply is not utilized in that
616 * case. See rpcrdma_inline_fixup.
618 * A regbuf is used here to remember the buffer size.
621 rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
622 size_t size, gfp_t flags)
624 struct rpcrdma_regbuf *rb;
626 if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size)
629 rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags);
633 rpcrdma_free_regbuf(req->rl_recvbuf);
634 r_xprt->rx_stats.hardway_register_count += size;
635 req->rl_recvbuf = rb;
640 * xprt_rdma_allocate - allocate transport resources for an RPC
644 * 0: Success; rq_buffer points to RPC buffer to use
645 * ENOMEM: Out of memory, call again later
646 * EIO: A permanent error occurred, do not retry
648 * The RDMA allocate/free functions need the task structure as a place
649 * to hide the struct rpcrdma_req, which is necessary for the actual
650 * send/recv sequence.
652 * xprt_rdma_allocate provides buffers that are already mapped for
653 * DMA, and a local DMA lkey is provided for each.
656 xprt_rdma_allocate(struct rpc_task *task)
658 struct rpc_rqst *rqst = task->tk_rqstp;
659 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
660 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
663 flags = RPCRDMA_DEF_GFP;
664 if (RPC_IS_SWAPPER(task))
665 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
667 if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags))
669 if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
672 rqst->rq_buffer = req->rl_sendbuf->rg_base;
673 rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
674 trace_xprtrdma_allocate(task, req);
678 trace_xprtrdma_allocate(task, NULL);
683 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
686 * Caller guarantees rqst->rq_buffer is non-NULL.
689 xprt_rdma_free(struct rpc_task *task)
691 struct rpc_rqst *rqst = task->tk_rqstp;
692 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
693 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
695 if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
696 rpcrdma_release_rqst(r_xprt, req);
697 trace_xprtrdma_rpc_done(task, req);
701 * xprt_rdma_send_request - marshal and send an RPC request
702 * @task: RPC task with an RPC message in rq_snd_buf
704 * Caller holds the transport's write lock.
707 * %0 if the RPC message has been sent
708 * %-ENOTCONN if the caller should reconnect and call again
709 * %-EAGAIN if the caller should call again
710 * %-ENOBUFS if the caller should call again after a delay
711 * %-EIO if a permanent error occurred and the request was not
712 * sent. Do not try to send this message again.
715 xprt_rdma_send_request(struct rpc_task *task)
717 struct rpc_rqst *rqst = task->tk_rqstp;
718 struct rpc_xprt *xprt = rqst->rq_xprt;
719 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
720 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
723 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
724 if (unlikely(!rqst->rq_buffer))
725 return xprt_rdma_bc_send_reply(rqst);
726 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
728 if (!xprt_connected(xprt))
729 goto drop_connection;
731 rc = rpcrdma_marshal_req(r_xprt, rqst);
735 /* Must suppress retransmit to maintain credits */
736 if (rqst->rq_connect_cookie == xprt->connect_cookie)
737 goto drop_connection;
738 rqst->rq_xtime = ktime_get();
740 __set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
741 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
742 goto drop_connection;
744 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
745 rqst->rq_bytes_sent = 0;
747 /* An RPC with no reply will throw off credit accounting,
748 * so drop the connection to reset the credit grant.
750 if (!rpc_reply_expected(task))
751 goto drop_connection;
758 xprt_disconnect_done(xprt);
759 return -ENOTCONN; /* implies disconnect */
762 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
764 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
767 if (xprt_connected(xprt))
768 idle_time = (long)(jiffies - xprt->last_used) / HZ;
770 seq_puts(seq, "\txprt:\trdma ");
771 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
772 0, /* need a local port? */
773 xprt->stat.bind_count,
774 xprt->stat.connect_count,
775 xprt->stat.connect_time,
782 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
783 r_xprt->rx_stats.read_chunk_count,
784 r_xprt->rx_stats.write_chunk_count,
785 r_xprt->rx_stats.reply_chunk_count,
786 r_xprt->rx_stats.total_rdma_request,
787 r_xprt->rx_stats.total_rdma_reply,
788 r_xprt->rx_stats.pullup_copy_count,
789 r_xprt->rx_stats.fixup_copy_count,
790 r_xprt->rx_stats.hardway_register_count,
791 r_xprt->rx_stats.failed_marshal_count,
792 r_xprt->rx_stats.bad_reply_count,
793 r_xprt->rx_stats.nomsg_call_count);
794 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
795 r_xprt->rx_stats.mrs_recovered,
796 r_xprt->rx_stats.mrs_orphaned,
797 r_xprt->rx_stats.mrs_allocated,
798 r_xprt->rx_stats.local_inv_needed,
799 r_xprt->rx_stats.empty_sendctx_q,
800 r_xprt->rx_stats.reply_waits_for_send);
804 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
810 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
815 * Plumbing for rpc transport switch and kernel module
818 static const struct rpc_xprt_ops xprt_rdma_procs = {
819 .reserve_xprt = xprt_reserve_xprt_cong,
820 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
821 .alloc_slot = xprt_rdma_alloc_slot,
822 .free_slot = xprt_rdma_free_slot,
823 .release_request = xprt_release_rqst_cong, /* ditto */
824 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
825 .timer = xprt_rdma_timer,
826 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
827 .set_port = xprt_rdma_set_port,
828 .connect = xprt_rdma_connect,
829 .buf_alloc = xprt_rdma_allocate,
830 .buf_free = xprt_rdma_free,
831 .send_request = xprt_rdma_send_request,
832 .close = xprt_rdma_close,
833 .destroy = xprt_rdma_destroy,
834 .print_stats = xprt_rdma_print_stats,
835 .enable_swap = xprt_rdma_enable_swap,
836 .disable_swap = xprt_rdma_disable_swap,
837 .inject_disconnect = xprt_rdma_inject_disconnect,
838 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
839 .bc_setup = xprt_rdma_bc_setup,
840 .bc_up = xprt_rdma_bc_up,
841 .bc_maxpayload = xprt_rdma_bc_maxpayload,
842 .bc_free_rqst = xprt_rdma_bc_free_rqst,
843 .bc_destroy = xprt_rdma_bc_destroy,
847 static struct xprt_class xprt_rdma = {
848 .list = LIST_HEAD_INIT(xprt_rdma.list),
850 .owner = THIS_MODULE,
851 .ident = XPRT_TRANSPORT_RDMA,
852 .setup = xprt_setup_rdma,
855 void xprt_rdma_cleanup(void)
859 dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
860 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
861 if (sunrpc_table_header) {
862 unregister_sysctl_table(sunrpc_table_header);
863 sunrpc_table_header = NULL;
866 rc = xprt_unregister_transport(&xprt_rdma);
868 dprintk("RPC: %s: xprt_unregister returned %i\n",
871 rpcrdma_destroy_wq();
873 rc = xprt_unregister_transport(&xprt_rdma_bc);
875 dprintk("RPC: %s: xprt_unregister(bc) returned %i\n",
879 int xprt_rdma_init(void)
883 rc = rpcrdma_alloc_wq();
887 rc = xprt_register_transport(&xprt_rdma);
889 rpcrdma_destroy_wq();
893 rc = xprt_register_transport(&xprt_rdma_bc);
895 xprt_unregister_transport(&xprt_rdma);
896 rpcrdma_destroy_wq();
900 dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
902 dprintk("Defaults:\n");
903 dprintk("\tSlots %d\n"
904 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
905 xprt_rdma_slot_table_entries,
906 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
907 dprintk("\tPadding 0\n\tMemreg %d\n", xprt_rdma_memreg_strategy);
909 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
910 if (!sunrpc_table_header)
911 sunrpc_table_header = register_sysctl_table(sunrpc_table);