2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
17 * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
22 * Neither the name of the Network Appliance, Inc. nor the names of
23 * its contributors may be used to endorse or promote products
24 * derived from this software without specific prior written
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 * This file contains the top-level implementation of an RPC RDMA
46 * Naming convention: functions beginning with xprt_ are part of the
47 * transport switch. All others are RPC RDMA internal.
50 #include <linux/module.h>
51 #include <linux/init.h>
52 #include <linux/seq_file.h>
54 #include "xprt_rdma.h"
57 # define RPCDBG_FACILITY RPCDBG_TRANS
60 MODULE_LICENSE("Dual BSD/GPL");
62 MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS");
63 MODULE_AUTHOR("Network Appliance, Inc.");
69 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
70 static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
71 static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
72 static unsigned int xprt_rdma_inline_write_padding;
73 static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR;
74 int xprt_rdma_pad_optimize = 0;
78 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
79 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
80 static unsigned int zero;
81 static unsigned int max_padding = PAGE_SIZE;
82 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
83 static unsigned int max_memreg = RPCRDMA_LAST - 1;
85 static struct ctl_table_header *sunrpc_table_header;
87 static ctl_table xr_tunables_table[] = {
89 .procname = "rdma_slot_table_entries",
90 .data = &xprt_rdma_slot_table_entries,
91 .maxlen = sizeof(unsigned int),
93 .proc_handler = proc_dointvec_minmax,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
98 .procname = "rdma_max_inline_read",
99 .data = &xprt_rdma_max_inline_read,
100 .maxlen = sizeof(unsigned int),
102 .proc_handler = proc_dointvec,
105 .procname = "rdma_max_inline_write",
106 .data = &xprt_rdma_max_inline_write,
107 .maxlen = sizeof(unsigned int),
109 .proc_handler = proc_dointvec,
112 .procname = "rdma_inline_write_padding",
113 .data = &xprt_rdma_inline_write_padding,
114 .maxlen = sizeof(unsigned int),
116 .proc_handler = proc_dointvec_minmax,
118 .extra2 = &max_padding,
121 .procname = "rdma_memreg_strategy",
122 .data = &xprt_rdma_memreg_strategy,
123 .maxlen = sizeof(unsigned int),
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &min_memreg,
127 .extra2 = &max_memreg,
130 .procname = "rdma_pad_optimize",
131 .data = &xprt_rdma_pad_optimize,
132 .maxlen = sizeof(unsigned int),
134 .proc_handler = proc_dointvec,
139 static ctl_table sunrpc_table[] = {
141 .procname = "sunrpc",
143 .child = xr_tunables_table
150 static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */
153 xprt_rdma_format_addresses(struct rpc_xprt *xprt)
155 struct sockaddr *sap = (struct sockaddr *)
156 &rpcx_to_rdmad(xprt).addr;
157 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
160 (void)rpc_ntop(sap, buf, sizeof(buf));
161 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
163 (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
164 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
166 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
168 (void)snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
169 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
171 (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
172 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
175 xprt->address_strings[RPC_DISPLAY_NETID] = "rdma";
179 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
183 for (i = 0; i < RPC_DISPLAY_MAX; i++)
185 case RPC_DISPLAY_PROTO:
186 case RPC_DISPLAY_NETID:
189 kfree(xprt->address_strings[i]);
194 xprt_rdma_connect_worker(struct work_struct *work)
196 struct rpcrdma_xprt *r_xprt =
197 container_of(work, struct rpcrdma_xprt, rdma_connect.work);
198 struct rpc_xprt *xprt = &r_xprt->xprt;
201 if (!xprt->shutdown) {
202 xprt_clear_connected(xprt);
204 dprintk("RPC: %s: %sconnect\n", __func__,
205 r_xprt->rx_ep.rep_connected != 0 ? "re" : "");
206 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia);
213 xprt_wake_pending_tasks(xprt, rc);
216 dprintk("RPC: %s: exit\n", __func__);
217 xprt_clear_connecting(xprt);
224 * Free all memory associated with the object, including its own.
225 * NOTE: none of the *destroy methods free memory for their top-level
226 * objects, even though they may have allocated it (they do free
227 * private memory). It's up to the caller to handle it. In this
228 * case (RDMA transport), all structure memory is inlined with the
229 * struct rpcrdma_xprt.
232 xprt_rdma_destroy(struct rpc_xprt *xprt)
234 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
237 dprintk("RPC: %s: called\n", __func__);
239 cancel_delayed_work(&r_xprt->rdma_connect);
240 flush_scheduled_work();
242 xprt_clear_connected(xprt);
244 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
245 rc = rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
247 dprintk("RPC: %s: rpcrdma_ep_destroy returned %i\n",
249 rpcrdma_ia_close(&r_xprt->rx_ia);
251 xprt_rdma_free_addresses(xprt);
257 dprintk("RPC: %s: returning\n", __func__);
259 module_put(THIS_MODULE);
262 static const struct rpc_timeout xprt_rdma_default_timeout = {
263 .to_initval = 60 * HZ,
264 .to_maxval = 60 * HZ,
268 * xprt_setup_rdma - Set up transport to use RDMA
270 * @args: rpc transport arguments
272 static struct rpc_xprt *
273 xprt_setup_rdma(struct xprt_create *args)
275 struct rpcrdma_create_data_internal cdata;
276 struct rpc_xprt *xprt;
277 struct rpcrdma_xprt *new_xprt;
278 struct rpcrdma_ep *new_ep;
279 struct sockaddr_in *sin;
282 if (args->addrlen > sizeof(xprt->addr)) {
283 dprintk("RPC: %s: address too large\n", __func__);
284 return ERR_PTR(-EBADF);
287 xprt = kzalloc(sizeof(struct rpcrdma_xprt), GFP_KERNEL);
289 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n",
291 return ERR_PTR(-ENOMEM);
294 xprt->max_reqs = xprt_rdma_slot_table_entries;
295 xprt->slot = kcalloc(xprt->max_reqs,
296 sizeof(struct rpc_rqst), GFP_KERNEL);
297 if (xprt->slot == NULL) {
298 dprintk("RPC: %s: couldn't allocate %d slots\n",
299 __func__, xprt->max_reqs);
301 return ERR_PTR(-ENOMEM);
304 /* 60 second timeout, no retries */
305 xprt->timeout = &xprt_rdma_default_timeout;
306 xprt->bind_timeout = (60U * HZ);
307 xprt->connect_timeout = (60U * HZ);
308 xprt->reestablish_timeout = (5U * HZ);
309 xprt->idle_timeout = (5U * 60 * HZ);
311 xprt->resvport = 0; /* privileged port not needed */
312 xprt->tsh_size = 0; /* RPC-RDMA handles framing */
313 xprt->max_payload = RPCRDMA_MAX_DATA_SEGS * PAGE_SIZE;
314 xprt->ops = &xprt_rdma_procs;
317 * Set up RDMA-specific connect data.
320 /* Put server RDMA address in local cdata */
321 memcpy(&cdata.addr, args->dstaddr, args->addrlen);
323 /* Ensure xprt->addr holds valid server TCP (not RDMA)
324 * address, for any side protocols which peek at it */
325 xprt->prot = IPPROTO_TCP;
326 xprt->addrlen = args->addrlen;
327 memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
329 sin = (struct sockaddr_in *)&cdata.addr;
330 if (ntohs(sin->sin_port) != 0)
331 xprt_set_bound(xprt);
333 dprintk("RPC: %s: %pI4:%u\n",
334 __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
336 /* Set max requests */
337 cdata.max_requests = xprt->max_reqs;
339 /* Set some length limits */
340 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
341 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
343 cdata.inline_wsize = xprt_rdma_max_inline_write;
344 if (cdata.inline_wsize > cdata.wsize)
345 cdata.inline_wsize = cdata.wsize;
347 cdata.inline_rsize = xprt_rdma_max_inline_read;
348 if (cdata.inline_rsize > cdata.rsize)
349 cdata.inline_rsize = cdata.rsize;
351 cdata.padding = xprt_rdma_inline_write_padding;
354 * Create new transport instance, which includes initialized
360 new_xprt = rpcx_to_rdmax(xprt);
362 rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
363 xprt_rdma_memreg_strategy);
368 * initialize and create ep
370 new_xprt->rx_data = cdata;
371 new_ep = &new_xprt->rx_ep;
372 new_ep->rep_remote_addr = cdata.addr;
374 rc = rpcrdma_ep_create(&new_xprt->rx_ep,
375 &new_xprt->rx_ia, &new_xprt->rx_data);
380 * Allocate pre-registered send and receive buffers for headers and
381 * any inline data. Also specify any padding which will be provided
382 * from a preregistered zero buffer.
384 rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia,
390 * Register a callback for connection events. This is necessary because
391 * connection loss notification is async. We also catch connection loss
392 * when reaping receives.
394 INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker);
395 new_ep->rep_func = rpcrdma_conn_func;
396 new_ep->rep_xprt = xprt;
398 xprt_rdma_format_addresses(xprt);
400 if (!try_module_get(THIS_MODULE))
406 xprt_rdma_free_addresses(xprt);
409 (void) rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
411 rpcrdma_ia_close(&new_xprt->rx_ia);
419 * Close a connection, during shutdown or timeout/reconnect
422 xprt_rdma_close(struct rpc_xprt *xprt)
424 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
426 dprintk("RPC: %s: closing\n", __func__);
427 if (r_xprt->rx_ep.rep_connected > 0)
428 xprt->reestablish_timeout = 0;
429 xprt_disconnect_done(xprt);
430 (void) rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
434 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
436 struct sockaddr_in *sap;
438 sap = (struct sockaddr_in *)&xprt->addr;
439 sap->sin_port = htons(port);
440 sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
441 sap->sin_port = htons(port);
442 dprintk("RPC: %s: %u\n", __func__, port);
446 xprt_rdma_connect(struct rpc_task *task)
448 struct rpc_xprt *xprt = (struct rpc_xprt *)task->tk_xprt;
449 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
451 if (!xprt_test_and_set_connecting(xprt)) {
452 if (r_xprt->rx_ep.rep_connected != 0) {
454 schedule_delayed_work(&r_xprt->rdma_connect,
455 xprt->reestablish_timeout);
456 xprt->reestablish_timeout <<= 1;
457 if (xprt->reestablish_timeout > (30 * HZ))
458 xprt->reestablish_timeout = (30 * HZ);
459 else if (xprt->reestablish_timeout < (5 * HZ))
460 xprt->reestablish_timeout = (5 * HZ);
462 schedule_delayed_work(&r_xprt->rdma_connect, 0);
463 if (!RPC_IS_ASYNC(task))
464 flush_scheduled_work();
470 xprt_rdma_reserve_xprt(struct rpc_task *task)
472 struct rpc_xprt *xprt = task->tk_xprt;
473 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
474 int credits = atomic_read(&r_xprt->rx_buf.rb_credits);
476 /* == RPC_CWNDSCALE @ init, but *after* setup */
477 if (r_xprt->rx_buf.rb_cwndscale == 0UL) {
478 r_xprt->rx_buf.rb_cwndscale = xprt->cwnd;
479 dprintk("RPC: %s: cwndscale %lu\n", __func__,
480 r_xprt->rx_buf.rb_cwndscale);
481 BUG_ON(r_xprt->rx_buf.rb_cwndscale <= 0);
483 xprt->cwnd = credits * r_xprt->rx_buf.rb_cwndscale;
484 return xprt_reserve_xprt_cong(task);
488 * The RDMA allocate/free functions need the task structure as a place
489 * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
490 * sequence. For this reason, the recv buffers are attached to send
491 * buffers for portions of the RPC. Note that the RPC layer allocates
492 * both send and receive buffers in the same call. We may register
493 * the receive buffer portion when using reply chunks.
496 xprt_rdma_allocate(struct rpc_task *task, size_t size)
498 struct rpc_xprt *xprt = task->tk_xprt;
499 struct rpcrdma_req *req, *nreq;
501 req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf);
504 if (size > req->rl_size) {
505 dprintk("RPC: %s: size %zd too large for buffer[%zd]: "
506 "prog %d vers %d proc %d\n",
507 __func__, size, req->rl_size,
508 task->tk_client->cl_prog, task->tk_client->cl_vers,
509 task->tk_msg.rpc_proc->p_proc);
511 * Outgoing length shortage. Our inline write max must have
512 * been configured to perform direct i/o.
514 * This is therefore a large metadata operation, and the
515 * allocate call was made on the maximum possible message,
516 * e.g. containing long filename(s) or symlink data. In
517 * fact, while these metadata operations *might* carry
518 * large outgoing payloads, they rarely *do*. However, we
519 * have to commit to the request here, so reallocate and
520 * register it now. The data path will never require this
523 * If the allocation or registration fails, the RPC framework
524 * will (doggedly) retry.
526 if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy ==
527 RPCRDMA_BOUNCEBUFFERS) {
528 /* forced to "pure inline" */
529 dprintk("RPC: %s: too much data (%zd) for inline "
530 "(r/w max %d/%d)\n", __func__, size,
531 rpcx_to_rdmad(xprt).inline_rsize,
532 rpcx_to_rdmad(xprt).inline_wsize);
534 rpc_exit(task, -EIO); /* fail the operation */
535 rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
538 if (task->tk_flags & RPC_TASK_SWAPPER)
539 nreq = kmalloc(sizeof *req + size, GFP_ATOMIC);
541 nreq = kmalloc(sizeof *req + size, GFP_NOFS);
545 if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia,
546 nreq->rl_base, size + sizeof(struct rpcrdma_req)
547 - offsetof(struct rpcrdma_req, rl_base),
548 &nreq->rl_handle, &nreq->rl_iov)) {
552 rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size;
553 nreq->rl_size = size;
555 nreq->rl_nchunks = 0;
556 nreq->rl_buffer = (struct rpcrdma_buffer *)req;
557 nreq->rl_reply = req->rl_reply;
558 memcpy(nreq->rl_segments,
559 req->rl_segments, sizeof nreq->rl_segments);
560 /* flag the swap with an unused field */
561 nreq->rl_iov.length = 0;
562 req->rl_reply = NULL;
565 dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req);
567 req->rl_connect_cookie = 0; /* our reserved value */
568 return req->rl_xdr_buf;
571 rpcrdma_buffer_put(req);
572 rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
577 * This function returns all RDMA resources to the pool.
580 xprt_rdma_free(void *buffer)
582 struct rpcrdma_req *req;
583 struct rpcrdma_xprt *r_xprt;
584 struct rpcrdma_rep *rep;
590 req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]);
591 if (req->rl_iov.length == 0) { /* see allocate above */
592 r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer,
593 struct rpcrdma_xprt, rx_buf);
595 r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
598 dprintk("RPC: %s: called on 0x%p%s\n",
599 __func__, rep, (rep && rep->rr_func) ? " (with waiter)" : "");
602 * Finish the deregistration. When using mw bind, this was
603 * begun in rpcrdma_reply_handler(). In all other modes, we
604 * do it here, in thread context. The process is considered
605 * complete when the rr_func vector becomes NULL - this
606 * was put in place during rpcrdma_reply_handler() - the wait
607 * call below will not block if the dereg is "done". If
608 * interrupted, our framework will clean up.
610 for (i = 0; req->rl_nchunks;) {
612 i += rpcrdma_deregister_external(
613 &req->rl_segments[i], r_xprt, NULL);
616 if (rep && wait_event_interruptible(rep->rr_unbind, !rep->rr_func)) {
617 rep->rr_func = NULL; /* abandon the callback */
618 req->rl_reply = NULL;
621 if (req->rl_iov.length == 0) { /* see allocate above */
622 struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer;
623 oreq->rl_reply = req->rl_reply;
624 (void) rpcrdma_deregister_internal(&r_xprt->rx_ia,
631 /* Put back request+reply buffers */
632 rpcrdma_buffer_put(req);
636 * send_request invokes the meat of RPC RDMA. It must do the following:
637 * 1. Marshal the RPC request into an RPC RDMA request, which means
638 * putting a header in front of data, and creating IOVs for RDMA
639 * from those in the request.
640 * 2. In marshaling, detect opportunities for RDMA, and use them.
641 * 3. Post a recv message to set up asynch completion, then send
642 * the request (rpcrdma_ep_post).
643 * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP).
647 xprt_rdma_send_request(struct rpc_task *task)
649 struct rpc_rqst *rqst = task->tk_rqstp;
650 struct rpc_xprt *xprt = task->tk_xprt;
651 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
652 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
654 /* marshal the send itself */
655 if (req->rl_niovs == 0 && rpcrdma_marshal_req(rqst) != 0) {
656 r_xprt->rx_stats.failed_marshal_count++;
657 dprintk("RPC: %s: rpcrdma_marshal_req failed\n",
662 if (req->rl_reply == NULL) /* e.g. reconnection */
663 rpcrdma_recv_buffer_get(req);
666 req->rl_reply->rr_func = rpcrdma_reply_handler;
667 /* this need only be done once, but... */
668 req->rl_reply->rr_xprt = xprt;
671 /* Must suppress retransmit to maintain credits */
672 if (req->rl_connect_cookie == xprt->connect_cookie)
673 goto drop_connection;
674 req->rl_connect_cookie = xprt->connect_cookie;
676 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
677 goto drop_connection;
679 task->tk_bytes_sent += rqst->rq_snd_buf.len;
680 rqst->rq_bytes_sent = 0;
684 xprt_disconnect_done(xprt);
685 return -ENOTCONN; /* implies disconnect */
688 static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
690 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
693 if (xprt_connected(xprt))
694 idle_time = (long)(jiffies - xprt->last_used) / HZ;
697 "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
698 "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
700 0, /* need a local port? */
701 xprt->stat.bind_count,
702 xprt->stat.connect_count,
703 xprt->stat.connect_time,
711 r_xprt->rx_stats.read_chunk_count,
712 r_xprt->rx_stats.write_chunk_count,
713 r_xprt->rx_stats.reply_chunk_count,
714 r_xprt->rx_stats.total_rdma_request,
715 r_xprt->rx_stats.total_rdma_reply,
716 r_xprt->rx_stats.pullup_copy_count,
717 r_xprt->rx_stats.fixup_copy_count,
718 r_xprt->rx_stats.hardway_register_count,
719 r_xprt->rx_stats.failed_marshal_count,
720 r_xprt->rx_stats.bad_reply_count);
724 * Plumbing for rpc transport switch and kernel module
727 static struct rpc_xprt_ops xprt_rdma_procs = {
728 .reserve_xprt = xprt_rdma_reserve_xprt,
729 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
730 .release_request = xprt_release_rqst_cong, /* ditto */
731 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */
732 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
733 .set_port = xprt_rdma_set_port,
734 .connect = xprt_rdma_connect,
735 .buf_alloc = xprt_rdma_allocate,
736 .buf_free = xprt_rdma_free,
737 .send_request = xprt_rdma_send_request,
738 .close = xprt_rdma_close,
739 .destroy = xprt_rdma_destroy,
740 .print_stats = xprt_rdma_print_stats
743 static struct xprt_class xprt_rdma = {
744 .list = LIST_HEAD_INIT(xprt_rdma.list),
746 .owner = THIS_MODULE,
747 .ident = XPRT_TRANSPORT_RDMA,
748 .setup = xprt_setup_rdma,
751 static void __exit xprt_rdma_cleanup(void)
755 dprintk(KERN_INFO "RPCRDMA Module Removed, deregister RPC RDMA transport\n");
757 if (sunrpc_table_header) {
758 unregister_sysctl_table(sunrpc_table_header);
759 sunrpc_table_header = NULL;
762 rc = xprt_unregister_transport(&xprt_rdma);
764 dprintk("RPC: %s: xprt_unregister returned %i\n",
768 static int __init xprt_rdma_init(void)
772 rc = xprt_register_transport(&xprt_rdma);
777 dprintk(KERN_INFO "RPCRDMA Module Init, register RPC RDMA transport\n");
779 dprintk(KERN_INFO "Defaults:\n");
780 dprintk(KERN_INFO "\tSlots %d\n"
781 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
782 xprt_rdma_slot_table_entries,
783 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
784 dprintk(KERN_INFO "\tPadding %d\n\tMemreg %d\n",
785 xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
788 if (!sunrpc_table_header)
789 sunrpc_table_header = register_sysctl_table(sunrpc_table);
794 module_init(xprt_rdma_init);
795 module_exit(xprt_rdma_cleanup);