1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (c) 2015-2018 Oracle. All rights reserved.
4 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
5 * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the BSD-type
11 * license below:
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials provided
23 * with the distribution.
24 *
25 * Neither the name of the Network Appliance, Inc. nor the names of
26 * its contributors may be used to endorse or promote products
27 * derived from this software without specific prior written
28 * permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 *
42 * Author: Tom Tucker <tom@opengridcomputing.com>
43 */
44
45 #include <linux/interrupt.h>
46 #include <linux/sched.h>
47 #include <linux/slab.h>
48 #include <linux/spinlock.h>
49 #include <linux/workqueue.h>
50 #include <linux/export.h>
51
52 #include <rdma/ib_verbs.h>
53 #include <rdma/rdma_cm.h>
54 #include <rdma/rw.h>
55
56 #include <linux/sunrpc/addr.h>
57 #include <linux/sunrpc/debug.h>
58 #include <linux/sunrpc/svc_xprt.h>
59 #include <linux/sunrpc/svc_rdma.h>
60
61 #include "xprt_rdma.h"
62 #include <trace/events/rpcrdma.h>
63
64 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
65
66 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv,
67 struct net *net);
68 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
69 struct net *net,
70 struct sockaddr *sa, int salen,
71 int flags);
72 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
73 static void svc_rdma_detach(struct svc_xprt *xprt);
74 static void svc_rdma_free(struct svc_xprt *xprt);
75 static int svc_rdma_has_wspace(struct svc_xprt *xprt);
76 static void svc_rdma_secure_port(struct svc_rqst *);
77 static void svc_rdma_kill_temp_xprt(struct svc_xprt *);
78
79 static const struct svc_xprt_ops svc_rdma_ops = {
80 .xpo_create = svc_rdma_create,
81 .xpo_recvfrom = svc_rdma_recvfrom,
82 .xpo_sendto = svc_rdma_sendto,
83 .xpo_result_payload = svc_rdma_result_payload,
84 .xpo_release_ctxt = svc_rdma_release_ctxt,
85 .xpo_detach = svc_rdma_detach,
86 .xpo_free = svc_rdma_free,
87 .xpo_has_wspace = svc_rdma_has_wspace,
88 .xpo_accept = svc_rdma_accept,
89 .xpo_secure_port = svc_rdma_secure_port,
90 .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt,
91 };
92
93 struct svc_xprt_class svc_rdma_class = {
94 .xcl_name = "rdma",
95 .xcl_owner = THIS_MODULE,
96 .xcl_ops = &svc_rdma_ops,
97 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA,
98 .xcl_ident = XPRT_TRANSPORT_RDMA,
99 };
100
101 /* QP event handler */
qp_event_handler(struct ib_event * event,void * context)102 static void qp_event_handler(struct ib_event *event, void *context)
103 {
104 struct svc_xprt *xprt = context;
105
106 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote);
107 switch (event->event) {
108 /* These are considered benign events */
109 case IB_EVENT_PATH_MIG:
110 case IB_EVENT_COMM_EST:
111 case IB_EVENT_SQ_DRAINED:
112 case IB_EVENT_QP_LAST_WQE_REACHED:
113 break;
114
115 /* These are considered fatal events */
116 case IB_EVENT_PATH_MIG_ERR:
117 case IB_EVENT_QP_FATAL:
118 case IB_EVENT_QP_REQ_ERR:
119 case IB_EVENT_QP_ACCESS_ERR:
120 case IB_EVENT_DEVICE_FATAL:
121 default:
122 svc_xprt_deferred_close(xprt);
123 break;
124 }
125 }
126
svc_rdma_create_xprt(struct svc_serv * serv,struct net * net)127 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv,
128 struct net *net)
129 {
130 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
131
132 if (!cma_xprt) {
133 dprintk("svcrdma: failed to create new transport\n");
134 return NULL;
135 }
136 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
137 INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
138 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
139 init_llist_head(&cma_xprt->sc_send_ctxts);
140 init_llist_head(&cma_xprt->sc_recv_ctxts);
141 init_llist_head(&cma_xprt->sc_rw_ctxts);
142 init_waitqueue_head(&cma_xprt->sc_send_wait);
143
144 spin_lock_init(&cma_xprt->sc_lock);
145 spin_lock_init(&cma_xprt->sc_rq_dto_lock);
146 spin_lock_init(&cma_xprt->sc_send_lock);
147 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock);
148
149 /*
150 * Note that this implies that the underlying transport support
151 * has some form of congestion control (see RFC 7530 section 3.1
152 * paragraph 2). For now, we assume that all supported RDMA
153 * transports are suitable here.
154 */
155 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags);
156
157 return cma_xprt;
158 }
159
160 static void
svc_rdma_parse_connect_private(struct svcxprt_rdma * newxprt,struct rdma_conn_param * param)161 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
162 struct rdma_conn_param *param)
163 {
164 const struct rpcrdma_connect_private *pmsg = param->private_data;
165
166 if (pmsg &&
167 pmsg->cp_magic == rpcrdma_cmp_magic &&
168 pmsg->cp_version == RPCRDMA_CMP_VERSION) {
169 newxprt->sc_snd_w_inv = pmsg->cp_flags &
170 RPCRDMA_CMP_F_SND_W_INV_OK;
171
172 dprintk("svcrdma: client send_size %u, recv_size %u "
173 "remote inv %ssupported\n",
174 rpcrdma_decode_buffer_size(pmsg->cp_send_size),
175 rpcrdma_decode_buffer_size(pmsg->cp_recv_size),
176 newxprt->sc_snd_w_inv ? "" : "un");
177 }
178 }
179
180 /*
181 * This function handles the CONNECT_REQUEST event on a listening
182 * endpoint. It is passed the cma_id for the _new_ connection. The context in
183 * this cma_id is inherited from the listening cma_id and is the svc_xprt
184 * structure for the listening endpoint.
185 *
186 * This function creates a new xprt for the new connection and enqueues it on
187 * the accept queue for the listent xprt. When the listen thread is kicked, it
188 * will call the recvfrom method on the listen xprt which will accept the new
189 * connection.
190 */
handle_connect_req(struct rdma_cm_id * new_cma_id,struct rdma_conn_param * param)191 static void handle_connect_req(struct rdma_cm_id *new_cma_id,
192 struct rdma_conn_param *param)
193 {
194 struct svcxprt_rdma *listen_xprt = new_cma_id->context;
195 struct svcxprt_rdma *newxprt;
196 struct sockaddr *sa;
197
198 /* Create a new transport */
199 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server,
200 listen_xprt->sc_xprt.xpt_net);
201 if (!newxprt)
202 return;
203 newxprt->sc_cm_id = new_cma_id;
204 new_cma_id->context = newxprt;
205 svc_rdma_parse_connect_private(newxprt, param);
206
207 /* Save client advertised inbound read limit for use later in accept. */
208 newxprt->sc_ord = param->initiator_depth;
209
210 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
211 newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa);
212 memcpy(&newxprt->sc_xprt.xpt_remote, sa,
213 newxprt->sc_xprt.xpt_remotelen);
214 snprintf(newxprt->sc_xprt.xpt_remotebuf,
215 sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa);
216
217 /* The remote port is arbitrary and not under the control of the
218 * client ULP. Set it to a fixed value so that the DRC continues
219 * to be effective after a reconnect.
220 */
221 rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0);
222
223 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
224 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
225
226 /*
227 * Enqueue the new transport on the accept queue of the listening
228 * transport
229 */
230 spin_lock(&listen_xprt->sc_lock);
231 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
232 spin_unlock(&listen_xprt->sc_lock);
233
234 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
235 svc_xprt_enqueue(&listen_xprt->sc_xprt);
236 }
237
238 /**
239 * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint
240 * @cma_id: the server's listener rdma_cm_id
241 * @event: details of the event
242 *
243 * Return values:
244 * %0: Do not destroy @cma_id
245 * %1: Destroy @cma_id (never returned here)
246 *
247 * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners.
248 */
svc_rdma_listen_handler(struct rdma_cm_id * cma_id,struct rdma_cm_event * event)249 static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id,
250 struct rdma_cm_event *event)
251 {
252 switch (event->event) {
253 case RDMA_CM_EVENT_CONNECT_REQUEST:
254 handle_connect_req(cma_id, &event->param.conn);
255 break;
256 default:
257 break;
258 }
259 return 0;
260 }
261
262 /**
263 * svc_rdma_cma_handler - Handle CM events on client connections
264 * @cma_id: the server's listener rdma_cm_id
265 * @event: details of the event
266 *
267 * Return values:
268 * %0: Do not destroy @cma_id
269 * %1: Destroy @cma_id (never returned here)
270 */
svc_rdma_cma_handler(struct rdma_cm_id * cma_id,struct rdma_cm_event * event)271 static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id,
272 struct rdma_cm_event *event)
273 {
274 struct svcxprt_rdma *rdma = cma_id->context;
275 struct svc_xprt *xprt = &rdma->sc_xprt;
276
277 switch (event->event) {
278 case RDMA_CM_EVENT_ESTABLISHED:
279 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
280
281 /* Handle any requests that were received while
282 * CONN_PENDING was set. */
283 svc_xprt_enqueue(xprt);
284 break;
285 case RDMA_CM_EVENT_DISCONNECTED:
286 case RDMA_CM_EVENT_DEVICE_REMOVAL:
287 svc_xprt_deferred_close(xprt);
288 break;
289 default:
290 break;
291 }
292 return 0;
293 }
294
295 /*
296 * Create a listening RDMA service endpoint.
297 */
svc_rdma_create(struct svc_serv * serv,struct net * net,struct sockaddr * sa,int salen,int flags)298 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
299 struct net *net,
300 struct sockaddr *sa, int salen,
301 int flags)
302 {
303 struct rdma_cm_id *listen_id;
304 struct svcxprt_rdma *cma_xprt;
305 int ret;
306
307 if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6)
308 return ERR_PTR(-EAFNOSUPPORT);
309 cma_xprt = svc_rdma_create_xprt(serv, net);
310 if (!cma_xprt)
311 return ERR_PTR(-ENOMEM);
312 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
313 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener");
314
315 listen_id = rdma_create_id(net, svc_rdma_listen_handler, cma_xprt,
316 RDMA_PS_TCP, IB_QPT_RC);
317 if (IS_ERR(listen_id)) {
318 ret = PTR_ERR(listen_id);
319 goto err0;
320 }
321
322 /* Allow both IPv4 and IPv6 sockets to bind a single port
323 * at the same time.
324 */
325 #if IS_ENABLED(CONFIG_IPV6)
326 ret = rdma_set_afonly(listen_id, 1);
327 if (ret)
328 goto err1;
329 #endif
330 ret = rdma_bind_addr(listen_id, sa);
331 if (ret)
332 goto err1;
333 cma_xprt->sc_cm_id = listen_id;
334
335 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
336 if (ret)
337 goto err1;
338
339 /*
340 * We need to use the address from the cm_id in case the
341 * caller specified 0 for the port number.
342 */
343 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
344 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
345
346 return &cma_xprt->sc_xprt;
347
348 err1:
349 rdma_destroy_id(listen_id);
350 err0:
351 kfree(cma_xprt);
352 return ERR_PTR(ret);
353 }
354
355 /*
356 * This is the xpo_recvfrom function for listening endpoints. Its
357 * purpose is to accept incoming connections. The CMA callback handler
358 * has already created a new transport and attached it to the new CMA
359 * ID.
360 *
361 * There is a queue of pending connections hung on the listening
362 * transport. This queue contains the new svc_xprt structure. This
363 * function takes svc_xprt structures off the accept_q and completes
364 * the connection.
365 */
svc_rdma_accept(struct svc_xprt * xprt)366 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
367 {
368 struct svcxprt_rdma *listen_rdma;
369 struct svcxprt_rdma *newxprt = NULL;
370 struct rdma_conn_param conn_param;
371 struct rpcrdma_connect_private pmsg;
372 struct ib_qp_init_attr qp_attr;
373 unsigned int ctxts, rq_depth;
374 struct ib_device *dev;
375 int ret = 0;
376 RPC_IFDEBUG(struct sockaddr *sap);
377
378 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
379 clear_bit(XPT_CONN, &xprt->xpt_flags);
380 /* Get the next entry off the accept list */
381 spin_lock(&listen_rdma->sc_lock);
382 if (!list_empty(&listen_rdma->sc_accept_q)) {
383 newxprt = list_entry(listen_rdma->sc_accept_q.next,
384 struct svcxprt_rdma, sc_accept_q);
385 list_del_init(&newxprt->sc_accept_q);
386 }
387 if (!list_empty(&listen_rdma->sc_accept_q))
388 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
389 spin_unlock(&listen_rdma->sc_lock);
390 if (!newxprt)
391 return NULL;
392
393 dev = newxprt->sc_cm_id->device;
394 newxprt->sc_port_num = newxprt->sc_cm_id->port_num;
395
396 /* Qualify the transport resource defaults with the
397 * capabilities of this particular device */
398 /* Transport header, head iovec, tail iovec */
399 newxprt->sc_max_send_sges = 3;
400 /* Add one SGE per page list entry */
401 newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1;
402 if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge)
403 newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
404 newxprt->sc_max_req_size = svcrdma_max_req_size;
405 newxprt->sc_max_requests = svcrdma_max_requests;
406 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests;
407 newxprt->sc_recv_batch = RPCRDMA_MAX_RECV_BATCH;
408 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests +
409 newxprt->sc_recv_batch;
410 if (rq_depth > dev->attrs.max_qp_wr) {
411 pr_warn("svcrdma: reducing receive depth to %d\n",
412 dev->attrs.max_qp_wr);
413 rq_depth = dev->attrs.max_qp_wr;
414 newxprt->sc_recv_batch = 1;
415 newxprt->sc_max_requests = rq_depth - 2;
416 newxprt->sc_max_bc_requests = 2;
417 }
418 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
419 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES);
420 ctxts *= newxprt->sc_max_requests;
421 newxprt->sc_sq_depth = rq_depth + ctxts;
422 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) {
423 pr_warn("svcrdma: reducing send depth to %d\n",
424 dev->attrs.max_qp_wr);
425 newxprt->sc_sq_depth = dev->attrs.max_qp_wr;
426 }
427 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth);
428
429 newxprt->sc_pd = ib_alloc_pd(dev, 0);
430 if (IS_ERR(newxprt->sc_pd)) {
431 trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd));
432 goto errout;
433 }
434 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth,
435 IB_POLL_WORKQUEUE);
436 if (IS_ERR(newxprt->sc_sq_cq))
437 goto errout;
438 newxprt->sc_rq_cq =
439 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE);
440 if (IS_ERR(newxprt->sc_rq_cq))
441 goto errout;
442
443 memset(&qp_attr, 0, sizeof qp_attr);
444 qp_attr.event_handler = qp_event_handler;
445 qp_attr.qp_context = &newxprt->sc_xprt;
446 qp_attr.port_num = newxprt->sc_port_num;
447 qp_attr.cap.max_rdma_ctxs = ctxts;
448 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts;
449 qp_attr.cap.max_recv_wr = rq_depth;
450 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges;
451 qp_attr.cap.max_recv_sge = 1;
452 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
453 qp_attr.qp_type = IB_QPT_RC;
454 qp_attr.send_cq = newxprt->sc_sq_cq;
455 qp_attr.recv_cq = newxprt->sc_rq_cq;
456 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n",
457 newxprt->sc_cm_id, newxprt->sc_pd);
458 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n",
459 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr);
460 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n",
461 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge);
462
463 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
464 if (ret) {
465 trace_svcrdma_qp_err(newxprt, ret);
466 goto errout;
467 }
468 newxprt->sc_qp = newxprt->sc_cm_id->qp;
469
470 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
471 newxprt->sc_snd_w_inv = false;
472 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) &&
473 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) {
474 trace_svcrdma_fabric_err(newxprt, -EINVAL);
475 goto errout;
476 }
477
478 if (!svc_rdma_post_recvs(newxprt))
479 goto errout;
480
481 /* Construct RDMA-CM private message */
482 pmsg.cp_magic = rpcrdma_cmp_magic;
483 pmsg.cp_version = RPCRDMA_CMP_VERSION;
484 pmsg.cp_flags = 0;
485 pmsg.cp_send_size = pmsg.cp_recv_size =
486 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size);
487
488 /* Accept Connection */
489 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
490 memset(&conn_param, 0, sizeof conn_param);
491 conn_param.responder_resources = 0;
492 conn_param.initiator_depth = min_t(int, newxprt->sc_ord,
493 dev->attrs.max_qp_init_rd_atom);
494 if (!conn_param.initiator_depth) {
495 ret = -EINVAL;
496 trace_svcrdma_initdepth_err(newxprt, ret);
497 goto errout;
498 }
499 conn_param.private_data = &pmsg;
500 conn_param.private_data_len = sizeof(pmsg);
501 rdma_lock_handler(newxprt->sc_cm_id);
502 newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler;
503 ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
504 rdma_unlock_handler(newxprt->sc_cm_id);
505 if (ret) {
506 trace_svcrdma_accept_err(newxprt, ret);
507 goto errout;
508 }
509
510 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
511 dprintk("svcrdma: new connection %p accepted:\n", newxprt);
512 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
513 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap));
514 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
515 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap));
516 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges);
517 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth);
518 dprintk(" rdma_rw_ctxs : %d\n", ctxts);
519 dprintk(" max_requests : %d\n", newxprt->sc_max_requests);
520 dprintk(" ord : %d\n", conn_param.initiator_depth);
521 #endif
522
523 return &newxprt->sc_xprt;
524
525 errout:
526 /* Take a reference in case the DTO handler runs */
527 svc_xprt_get(&newxprt->sc_xprt);
528 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
529 ib_destroy_qp(newxprt->sc_qp);
530 rdma_destroy_id(newxprt->sc_cm_id);
531 /* This call to put will destroy the transport */
532 svc_xprt_put(&newxprt->sc_xprt);
533 return NULL;
534 }
535
svc_rdma_detach(struct svc_xprt * xprt)536 static void svc_rdma_detach(struct svc_xprt *xprt)
537 {
538 struct svcxprt_rdma *rdma =
539 container_of(xprt, struct svcxprt_rdma, sc_xprt);
540
541 rdma_disconnect(rdma->sc_cm_id);
542 }
543
__svc_rdma_free(struct work_struct * work)544 static void __svc_rdma_free(struct work_struct *work)
545 {
546 struct svcxprt_rdma *rdma =
547 container_of(work, struct svcxprt_rdma, sc_work);
548
549 /* This blocks until the Completion Queues are empty */
550 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
551 ib_drain_qp(rdma->sc_qp);
552
553 svc_rdma_flush_recv_queues(rdma);
554
555 svc_rdma_destroy_rw_ctxts(rdma);
556 svc_rdma_send_ctxts_destroy(rdma);
557 svc_rdma_recv_ctxts_destroy(rdma);
558
559 /* Destroy the QP if present (not a listener) */
560 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
561 ib_destroy_qp(rdma->sc_qp);
562
563 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
564 ib_free_cq(rdma->sc_sq_cq);
565
566 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
567 ib_free_cq(rdma->sc_rq_cq);
568
569 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
570 ib_dealloc_pd(rdma->sc_pd);
571
572 /* Destroy the CM ID */
573 rdma_destroy_id(rdma->sc_cm_id);
574
575 kfree(rdma);
576 }
577
svc_rdma_free(struct svc_xprt * xprt)578 static void svc_rdma_free(struct svc_xprt *xprt)
579 {
580 struct svcxprt_rdma *rdma =
581 container_of(xprt, struct svcxprt_rdma, sc_xprt);
582
583 INIT_WORK(&rdma->sc_work, __svc_rdma_free);
584 schedule_work(&rdma->sc_work);
585 }
586
svc_rdma_has_wspace(struct svc_xprt * xprt)587 static int svc_rdma_has_wspace(struct svc_xprt *xprt)
588 {
589 struct svcxprt_rdma *rdma =
590 container_of(xprt, struct svcxprt_rdma, sc_xprt);
591
592 /*
593 * If there are already waiters on the SQ,
594 * return false.
595 */
596 if (waitqueue_active(&rdma->sc_send_wait))
597 return 0;
598
599 /* Otherwise return true. */
600 return 1;
601 }
602
svc_rdma_secure_port(struct svc_rqst * rqstp)603 static void svc_rdma_secure_port(struct svc_rqst *rqstp)
604 {
605 set_bit(RQ_SECURE, &rqstp->rq_flags);
606 }
607
svc_rdma_kill_temp_xprt(struct svc_xprt * xprt)608 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt)
609 {
610 }
611