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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 static unsigned int xprt_rdma_inline_write_padding;
70 unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
71 int xprt_rdma_pad_optimize;
73 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
75 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
76 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
77 static unsigned int min_inline_size = RPCRDMA_MIN_INLINE;
78 static unsigned int max_inline_size = RPCRDMA_MAX_INLINE;
79 static unsigned int zero;
80 static unsigned int max_padding = PAGE_SIZE;
81 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
82 static unsigned int max_memreg = RPCRDMA_LAST - 1;
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",
116 .data = &xprt_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 (++xprt->connect_cookie == 0) /* maintain a reserved value */
240 ++xprt->connect_cookie;
241 if (ep->rep_connected > 0) {
242 if (!xprt_test_and_set_connected(xprt))
243 xprt_wake_pending_tasks(xprt, 0);
245 if (xprt_test_and_clear_connected(xprt))
246 xprt_wake_pending_tasks(xprt, -ENOTCONN);
248 spin_unlock_bh(&xprt->transport_lock);
252 xprt_rdma_connect_worker(struct work_struct *work)
254 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
255 rx_connect_worker.work);
256 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
259 xprt_clear_connected(xprt);
261 dprintk("RPC: %s: %sconnect\n", __func__,
262 r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
263 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
265 xprt_wake_pending_tasks(xprt, rc);
267 dprintk("RPC: %s: exit\n", __func__);
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 pr_info("rpcrdma: injecting transport disconnect on xprt=%p\n", 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 dprintk("RPC: %s: called\n", __func__);
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);
311 dprintk("RPC: %s: returning\n", __func__);
313 module_put(THIS_MODULE);
316 static const struct rpc_timeout xprt_rdma_default_timeout = {
317 .to_initval = 60 * HZ,
318 .to_maxval = 60 * HZ,
322 * xprt_setup_rdma - Set up transport to use RDMA
324 * @args: rpc transport arguments
326 static struct rpc_xprt *
327 xprt_setup_rdma(struct xprt_create *args)
329 struct rpcrdma_create_data_internal cdata;
330 struct rpc_xprt *xprt;
331 struct rpcrdma_xprt *new_xprt;
332 struct rpcrdma_ep *new_ep;
333 struct sockaddr *sap;
336 if (args->addrlen > sizeof(xprt->addr)) {
337 dprintk("RPC: %s: address too large\n", __func__);
338 return ERR_PTR(-EBADF);
341 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
342 xprt_rdma_slot_table_entries,
343 xprt_rdma_slot_table_entries);
345 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
347 return ERR_PTR(-ENOMEM);
350 /* 60 second timeout, no retries */
351 xprt->timeout = &xprt_rdma_default_timeout;
352 xprt->bind_timeout = RPCRDMA_BIND_TO;
353 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
354 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
356 xprt->resvport = 0; /* privileged port not needed */
357 xprt->tsh_size = 0; /* RPC-RDMA handles framing */
358 xprt->ops = &xprt_rdma_procs;
361 * Set up RDMA-specific connect data.
364 sap = (struct sockaddr *)&cdata.addr;
365 memcpy(sap, args->dstaddr, args->addrlen);
367 /* Ensure xprt->addr holds valid server TCP (not RDMA)
368 * address, for any side protocols which peek at it */
369 xprt->prot = IPPROTO_TCP;
370 xprt->addrlen = args->addrlen;
371 memcpy(&xprt->addr, sap, xprt->addrlen);
373 if (rpc_get_port(sap))
374 xprt_set_bound(xprt);
376 cdata.max_requests = xprt->max_reqs;
378 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
379 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
381 cdata.inline_wsize = xprt_rdma_max_inline_write;
382 if (cdata.inline_wsize > cdata.wsize)
383 cdata.inline_wsize = cdata.wsize;
385 cdata.inline_rsize = xprt_rdma_max_inline_read;
386 if (cdata.inline_rsize > cdata.rsize)
387 cdata.inline_rsize = cdata.rsize;
389 cdata.padding = xprt_rdma_inline_write_padding;
392 * Create new transport instance, which includes initialized
398 new_xprt = rpcx_to_rdmax(xprt);
400 rc = rpcrdma_ia_open(new_xprt, sap);
405 * initialize and create ep
407 new_xprt->rx_data = cdata;
408 new_ep = &new_xprt->rx_ep;
409 new_ep->rep_remote_addr = cdata.addr;
411 rc = rpcrdma_ep_create(&new_xprt->rx_ep,
412 &new_xprt->rx_ia, &new_xprt->rx_data);
417 * Allocate pre-registered send and receive buffers for headers and
418 * any inline data. Also specify any padding which will be provided
419 * from a preregistered zero buffer.
421 rc = rpcrdma_buffer_create(new_xprt);
426 * Register a callback for connection events. This is necessary because
427 * connection loss notification is async. We also catch connection loss
428 * when reaping receives.
430 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
431 xprt_rdma_connect_worker);
433 xprt_rdma_format_addresses(xprt, sap);
434 xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
435 if (xprt->max_payload == 0)
437 xprt->max_payload <<= PAGE_SHIFT;
438 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n",
439 __func__, xprt->max_payload);
441 if (!try_module_get(THIS_MODULE))
444 dprintk("RPC: %s: %s:%s\n", __func__,
445 xprt->address_strings[RPC_DISPLAY_ADDR],
446 xprt->address_strings[RPC_DISPLAY_PORT]);
450 xprt_rdma_free_addresses(xprt);
453 rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
455 rpcrdma_ia_close(&new_xprt->rx_ia);
462 * xprt_rdma_close - Close down RDMA connection
463 * @xprt: generic transport to be closed
465 * Called during transport shutdown reconnect, or device
466 * removal. Caller holds the transport's write lock.
469 xprt_rdma_close(struct rpc_xprt *xprt)
471 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
472 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
473 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
475 dprintk("RPC: %s: closing xprt %p\n", __func__, xprt);
477 if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) {
478 xprt_clear_connected(xprt);
479 rpcrdma_ia_remove(ia);
482 if (ep->rep_connected == -ENODEV)
484 if (ep->rep_connected > 0)
485 xprt->reestablish_timeout = 0;
486 xprt_disconnect_done(xprt);
487 rpcrdma_ep_disconnect(ep, ia);
491 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
493 struct sockaddr_in *sap;
495 sap = (struct sockaddr_in *)&xprt->addr;
496 sap->sin_port = htons(port);
497 sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
498 sap->sin_port = htons(port);
499 dprintk("RPC: %s: %u\n", __func__, port);
503 * xprt_rdma_timer - invoked when an RPC times out
504 * @xprt: controlling RPC transport
505 * @task: RPC task that timed out
507 * Invoked when the transport is still connected, but an RPC
508 * retransmit timeout occurs.
510 * Since RDMA connections don't have a keep-alive, forcibly
511 * disconnect and retry to connect. This drives full
512 * detection of the network path, and retransmissions of
516 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
518 dprintk("RPC: %5u %s: xprt = %p\n", task->tk_pid, __func__, xprt);
520 xprt_force_disconnect(xprt);
524 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
526 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
528 if (r_xprt->rx_ep.rep_connected != 0) {
530 schedule_delayed_work(&r_xprt->rx_connect_worker,
531 xprt->reestablish_timeout);
532 xprt->reestablish_timeout <<= 1;
533 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
534 xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
535 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
536 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
538 schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
539 if (!RPC_IS_ASYNC(task))
540 flush_delayed_work(&r_xprt->rx_connect_worker);
544 /* Allocate a fixed-size buffer in which to construct and send the
545 * RPC-over-RDMA header for this request.
548 rpcrdma_get_rdmabuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
551 size_t size = RPCRDMA_HDRBUF_SIZE;
552 struct rpcrdma_regbuf *rb;
557 rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags);
561 r_xprt->rx_stats.hardway_register_count += size;
562 req->rl_rdmabuf = rb;
563 xdr_buf_init(&req->rl_hdrbuf, rb->rg_base, rdmab_length(rb));
568 rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
569 size_t size, gfp_t flags)
571 struct rpcrdma_regbuf *rb;
573 if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size)
576 rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags);
580 rpcrdma_free_regbuf(req->rl_sendbuf);
581 r_xprt->rx_stats.hardway_register_count += size;
582 req->rl_sendbuf = rb;
586 /* The rq_rcv_buf is used only if a Reply chunk is necessary.
587 * The decision to use a Reply chunk is made later in
588 * rpcrdma_marshal_req. This buffer is registered at that time.
590 * Otherwise, the associated RPC Reply arrives in a separate
591 * Receive buffer, arbitrarily chosen by the HCA. The buffer
592 * allocated here for the RPC Reply is not utilized in that
593 * case. See rpcrdma_inline_fixup.
595 * A regbuf is used here to remember the buffer size.
598 rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
599 size_t size, gfp_t flags)
601 struct rpcrdma_regbuf *rb;
603 if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size)
606 rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags);
610 rpcrdma_free_regbuf(req->rl_recvbuf);
611 r_xprt->rx_stats.hardway_register_count += size;
612 req->rl_recvbuf = rb;
617 * xprt_rdma_allocate - allocate transport resources for an RPC
621 * 0: Success; rq_buffer points to RPC buffer to use
622 * ENOMEM: Out of memory, call again later
623 * EIO: A permanent error occurred, do not retry
625 * The RDMA allocate/free functions need the task structure as a place
626 * to hide the struct rpcrdma_req, which is necessary for the actual
627 * send/recv sequence.
629 * xprt_rdma_allocate provides buffers that are already mapped for
630 * DMA, and a local DMA lkey is provided for each.
633 xprt_rdma_allocate(struct rpc_task *task)
635 struct rpc_rqst *rqst = task->tk_rqstp;
636 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
637 struct rpcrdma_req *req;
640 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
644 flags = RPCRDMA_DEF_GFP;
645 if (RPC_IS_SWAPPER(task))
646 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
648 if (!rpcrdma_get_rdmabuf(r_xprt, req, flags))
650 if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags))
652 if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags))
655 dprintk("RPC: %5u %s: send size = %zd, recv size = %zd, req = %p\n",
656 task->tk_pid, __func__, rqst->rq_callsize,
657 rqst->rq_rcvsize, req);
659 req->rl_connect_cookie = 0; /* our reserved value */
660 rpcrdma_set_xprtdata(rqst, req);
661 rqst->rq_buffer = req->rl_sendbuf->rg_base;
662 rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
666 rpcrdma_buffer_put(req);
671 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
674 * Caller guarantees rqst->rq_buffer is non-NULL.
677 xprt_rdma_free(struct rpc_task *task)
679 struct rpc_rqst *rqst = task->tk_rqstp;
680 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
681 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
683 if (test_bit(RPCRDMA_REQ_F_BACKCHANNEL, &req->rl_flags))
686 dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply);
688 if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
689 rpcrdma_release_rqst(r_xprt, req);
690 rpcrdma_buffer_put(req);
694 * xprt_rdma_send_request - marshal and send an RPC request
695 * @task: RPC task with an RPC message in rq_snd_buf
697 * Caller holds the transport's write lock.
700 * 0: The request has been sent
701 * ENOTCONN: Caller needs to invoke connect logic then call again
702 * ENOBUFS: Call again later to send the request
703 * EIO: A permanent error occurred. The request was not sent,
704 * and don't try it again
706 * send_request invokes the meat of RPC RDMA. It must do the following:
708 * 1. Marshal the RPC request into an RPC RDMA request, which means
709 * putting a header in front of data, and creating IOVs for RDMA
710 * from those in the request.
711 * 2. In marshaling, detect opportunities for RDMA, and use them.
712 * 3. Post a recv message to set up asynch completion, then send
713 * the request (rpcrdma_ep_post).
714 * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
717 xprt_rdma_send_request(struct rpc_task *task)
719 struct rpc_rqst *rqst = task->tk_rqstp;
720 struct rpc_xprt *xprt = rqst->rq_xprt;
721 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
722 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
725 if (!xprt_connected(xprt))
726 goto drop_connection;
728 /* On retransmit, remove any previously registered chunks */
729 if (unlikely(!list_empty(&req->rl_registered)))
730 r_xprt->rx_ia.ri_ops->ro_unmap_sync(r_xprt,
731 &req->rl_registered);
733 rc = rpcrdma_marshal_req(r_xprt, rqst);
737 if (req->rl_reply == NULL) /* e.g. reconnection */
738 rpcrdma_recv_buffer_get(req);
740 /* Must suppress retransmit to maintain credits */
741 if (req->rl_connect_cookie == xprt->connect_cookie)
742 goto drop_connection;
743 req->rl_connect_cookie = xprt->connect_cookie;
745 set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
746 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
747 goto drop_connection;
749 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
750 rqst->rq_bytes_sent = 0;
757 xprt_disconnect_done(xprt);
758 return -ENOTCONN; /* implies disconnect */
761 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
763 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
766 if (xprt_connected(xprt))
767 idle_time = (long)(jiffies - xprt->last_used) / HZ;
769 seq_puts(seq, "\txprt:\trdma ");
770 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
771 0, /* need a local port? */
772 xprt->stat.bind_count,
773 xprt->stat.connect_count,
774 xprt->stat.connect_time,
781 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
782 r_xprt->rx_stats.read_chunk_count,
783 r_xprt->rx_stats.write_chunk_count,
784 r_xprt->rx_stats.reply_chunk_count,
785 r_xprt->rx_stats.total_rdma_request,
786 r_xprt->rx_stats.total_rdma_reply,
787 r_xprt->rx_stats.pullup_copy_count,
788 r_xprt->rx_stats.fixup_copy_count,
789 r_xprt->rx_stats.hardway_register_count,
790 r_xprt->rx_stats.failed_marshal_count,
791 r_xprt->rx_stats.bad_reply_count,
792 r_xprt->rx_stats.nomsg_call_count);
793 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
794 r_xprt->rx_stats.mrs_recovered,
795 r_xprt->rx_stats.mrs_orphaned,
796 r_xprt->rx_stats.mrs_allocated,
797 r_xprt->rx_stats.local_inv_needed,
798 r_xprt->rx_stats.empty_sendctx_q,
799 r_xprt->rx_stats.reply_waits_for_send);
803 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
809 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
814 * Plumbing for rpc transport switch and kernel module
817 static const struct rpc_xprt_ops xprt_rdma_procs = {
818 .reserve_xprt = xprt_reserve_xprt_cong,
819 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
820 .alloc_slot = xprt_alloc_slot,
821 .release_request = xprt_release_rqst_cong, /* ditto */
822 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
823 .timer = xprt_rdma_timer,
824 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
825 .set_port = xprt_rdma_set_port,
826 .connect = xprt_rdma_connect,
827 .buf_alloc = xprt_rdma_allocate,
828 .buf_free = xprt_rdma_free,
829 .send_request = xprt_rdma_send_request,
830 .close = xprt_rdma_close,
831 .destroy = xprt_rdma_destroy,
832 .print_stats = xprt_rdma_print_stats,
833 .enable_swap = xprt_rdma_enable_swap,
834 .disable_swap = xprt_rdma_disable_swap,
835 .inject_disconnect = xprt_rdma_inject_disconnect,
836 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
837 .bc_setup = xprt_rdma_bc_setup,
838 .bc_up = xprt_rdma_bc_up,
839 .bc_maxpayload = xprt_rdma_bc_maxpayload,
840 .bc_free_rqst = xprt_rdma_bc_free_rqst,
841 .bc_destroy = xprt_rdma_bc_destroy,
845 static struct xprt_class xprt_rdma = {
846 .list = LIST_HEAD_INIT(xprt_rdma.list),
848 .owner = THIS_MODULE,
849 .ident = XPRT_TRANSPORT_RDMA,
850 .setup = xprt_setup_rdma,
853 void xprt_rdma_cleanup(void)
857 dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
858 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
859 if (sunrpc_table_header) {
860 unregister_sysctl_table(sunrpc_table_header);
861 sunrpc_table_header = NULL;
864 rc = xprt_unregister_transport(&xprt_rdma);
866 dprintk("RPC: %s: xprt_unregister returned %i\n",
869 rpcrdma_destroy_wq();
871 rc = xprt_unregister_transport(&xprt_rdma_bc);
873 dprintk("RPC: %s: xprt_unregister(bc) returned %i\n",
877 int xprt_rdma_init(void)
881 rc = rpcrdma_alloc_wq();
885 rc = xprt_register_transport(&xprt_rdma);
887 rpcrdma_destroy_wq();
891 rc = xprt_register_transport(&xprt_rdma_bc);
893 xprt_unregister_transport(&xprt_rdma);
894 rpcrdma_destroy_wq();
898 dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
900 dprintk("Defaults:\n");
901 dprintk("\tSlots %d\n"
902 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
903 xprt_rdma_slot_table_entries,
904 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
905 dprintk("\tPadding %d\n\tMemreg %d\n",
906 xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
908 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
909 if (!sunrpc_table_header)
910 sunrpc_table_header = register_sysctl_table(sunrpc_table);