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_rqst = svc_rdma_release_rqst,
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 */
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 set_bit(XPT_CLOSE, &xprt->xpt_flags);
123 svc_xprt_enqueue(xprt);
124 break;
125 }
126 }
127
128 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv,
129 struct net *net)
130 {
131 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
132
133 if (!cma_xprt) {
134 dprintk("svcrdma: failed to create new transport\n");
135 return NULL;
136 }
137 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
138 INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
139 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
140 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
141 INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts);
142 init_llist_head(&cma_xprt->sc_recv_ctxts);
143 INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts);
144 init_waitqueue_head(&cma_xprt->sc_send_wait);
145
146 spin_lock_init(&cma_xprt->sc_lock);
147 spin_lock_init(&cma_xprt->sc_rq_dto_lock);
148 spin_lock_init(&cma_xprt->sc_send_lock);
149 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock);
150
151 /*
152 * Note that this implies that the underlying transport support
153 * has some form of congestion control (see RFC 7530 section 3.1
154 * paragraph 2). For now, we assume that all supported RDMA
155 * transports are suitable here.
156 */
157 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags);
158
159 return cma_xprt;
160 }
161
162 static void
163 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
164 struct rdma_conn_param *param)
165 {
166 const struct rpcrdma_connect_private *pmsg = param->private_data;
167
168 if (pmsg &&
169 pmsg->cp_magic == rpcrdma_cmp_magic &&
170 pmsg->cp_version == RPCRDMA_CMP_VERSION) {
171 newxprt->sc_snd_w_inv = pmsg->cp_flags &
172 RPCRDMA_CMP_F_SND_W_INV_OK;
173
174 dprintk("svcrdma: client send_size %u, recv_size %u "
175 "remote inv %ssupported\n",
176 rpcrdma_decode_buffer_size(pmsg->cp_send_size),
177 rpcrdma_decode_buffer_size(pmsg->cp_recv_size),
178 newxprt->sc_snd_w_inv ? "" : "un");
179 }
180 }
181
182 /*
183 * This function handles the CONNECT_REQUEST event on a listening
184 * endpoint. It is passed the cma_id for the _new_ connection. The context in
185 * this cma_id is inherited from the listening cma_id and is the svc_xprt
186 * structure for the listening endpoint.
187 *
188 * This function creates a new xprt for the new connection and enqueues it on
189 * the accept queue for the listent xprt. When the listen thread is kicked, it
190 * will call the recvfrom method on the listen xprt which will accept the new
191 * connection.
192 */
193 static void handle_connect_req(struct rdma_cm_id *new_cma_id,
194 struct rdma_conn_param *param)
195 {
196 struct svcxprt_rdma *listen_xprt = new_cma_id->context;
197 struct svcxprt_rdma *newxprt;
198 struct sockaddr *sa;
199
200 /* Create a new transport */
201 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server,
202 listen_xprt->sc_xprt.xpt_net);
203 if (!newxprt)
204 return;
205 newxprt->sc_cm_id = new_cma_id;
206 new_cma_id->context = newxprt;
207 svc_rdma_parse_connect_private(newxprt, param);
208
209 /* Save client advertised inbound read limit for use later in accept. */
210 newxprt->sc_ord = param->initiator_depth;
211
212 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
213 newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa);
214 memcpy(&newxprt->sc_xprt.xpt_remote, sa,
215 newxprt->sc_xprt.xpt_remotelen);
216 snprintf(newxprt->sc_xprt.xpt_remotebuf,
217 sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa);
218
219 /* The remote port is arbitrary and not under the control of the
220 * client ULP. Set it to a fixed value so that the DRC continues
221 * to be effective after a reconnect.
222 */
223 rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0);
224
225 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
226 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
227
228 /*
229 * Enqueue the new transport on the accept queue of the listening
230 * transport
231 */
232 spin_lock(&listen_xprt->sc_lock);
233 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
234 spin_unlock(&listen_xprt->sc_lock);
235
236 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
237 svc_xprt_enqueue(&listen_xprt->sc_xprt);
238 }
239
240 /**
241 * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint
242 * @cma_id: the server's listener rdma_cm_id
243 * @event: details of the event
244 *
245 * Return values:
246 * %0: Do not destroy @cma_id
247 * %1: Destroy @cma_id (never returned here)
248 *
249 * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners.
250 */
251 static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id,
252 struct rdma_cm_event *event)
253 {
254 switch (event->event) {
255 case RDMA_CM_EVENT_CONNECT_REQUEST:
256 handle_connect_req(cma_id, &event->param.conn);
257 break;
258 default:
259 break;
260 }
261 return 0;
262 }
263
264 /**
265 * svc_rdma_cma_handler - Handle CM events on client connections
266 * @cma_id: the server's listener rdma_cm_id
267 * @event: details of the event
268 *
269 * Return values:
270 * %0: Do not destroy @cma_id
271 * %1: Destroy @cma_id (never returned here)
272 */
273 static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id,
274 struct rdma_cm_event *event)
275 {
276 struct svcxprt_rdma *rdma = cma_id->context;
277 struct svc_xprt *xprt = &rdma->sc_xprt;
278
279 switch (event->event) {
280 case RDMA_CM_EVENT_ESTABLISHED:
281 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
282 svc_xprt_enqueue(xprt);
283 break;
284 case RDMA_CM_EVENT_DISCONNECTED:
285 case RDMA_CM_EVENT_DEVICE_REMOVAL:
286 set_bit(XPT_CLOSE, &xprt->xpt_flags);
287 svc_xprt_enqueue(xprt);
288 break;
289 default:
290 break;
291 }
292 return 0;
293 }
294
295 /*
296 * Create a listening RDMA service endpoint.
297 */
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 */
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 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests;
408 if (rq_depth > dev->attrs.max_qp_wr) {
409 pr_warn("svcrdma: reducing receive depth to %d\n",
410 dev->attrs.max_qp_wr);
411 rq_depth = dev->attrs.max_qp_wr;
412 newxprt->sc_max_requests = rq_depth - 2;
413 newxprt->sc_max_bc_requests = 2;
414 }
415 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests);
416 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES);
417 ctxts *= newxprt->sc_max_requests;
418 newxprt->sc_sq_depth = rq_depth + ctxts;
419 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) {
420 pr_warn("svcrdma: reducing send depth to %d\n",
421 dev->attrs.max_qp_wr);
422 newxprt->sc_sq_depth = dev->attrs.max_qp_wr;
423 }
424 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth);
425
426 newxprt->sc_pd = ib_alloc_pd(dev, 0);
427 if (IS_ERR(newxprt->sc_pd)) {
428 trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd));
429 goto errout;
430 }
431 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth,
432 IB_POLL_WORKQUEUE);
433 if (IS_ERR(newxprt->sc_sq_cq))
434 goto errout;
435 newxprt->sc_rq_cq =
436 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE);
437 if (IS_ERR(newxprt->sc_rq_cq))
438 goto errout;
439
440 memset(&qp_attr, 0, sizeof qp_attr);
441 qp_attr.event_handler = qp_event_handler;
442 qp_attr.qp_context = &newxprt->sc_xprt;
443 qp_attr.port_num = newxprt->sc_port_num;
444 qp_attr.cap.max_rdma_ctxs = ctxts;
445 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts;
446 qp_attr.cap.max_recv_wr = rq_depth;
447 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges;
448 qp_attr.cap.max_recv_sge = 1;
449 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
450 qp_attr.qp_type = IB_QPT_RC;
451 qp_attr.send_cq = newxprt->sc_sq_cq;
452 qp_attr.recv_cq = newxprt->sc_rq_cq;
453 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n",
454 newxprt->sc_cm_id, newxprt->sc_pd);
455 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n",
456 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr);
457 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n",
458 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge);
459
460 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
461 if (ret) {
462 trace_svcrdma_qp_err(newxprt, ret);
463 goto errout;
464 }
465 newxprt->sc_qp = newxprt->sc_cm_id->qp;
466
467 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
468 newxprt->sc_snd_w_inv = false;
469 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) &&
470 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) {
471 trace_svcrdma_fabric_err(newxprt, -EINVAL);
472 goto errout;
473 }
474
475 if (!svc_rdma_post_recvs(newxprt))
476 goto errout;
477
478 /* Construct RDMA-CM private message */
479 pmsg.cp_magic = rpcrdma_cmp_magic;
480 pmsg.cp_version = RPCRDMA_CMP_VERSION;
481 pmsg.cp_flags = 0;
482 pmsg.cp_send_size = pmsg.cp_recv_size =
483 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size);
484
485 /* Accept Connection */
486 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
487 memset(&conn_param, 0, sizeof conn_param);
488 conn_param.responder_resources = 0;
489 conn_param.initiator_depth = min_t(int, newxprt->sc_ord,
490 dev->attrs.max_qp_init_rd_atom);
491 if (!conn_param.initiator_depth) {
492 ret = -EINVAL;
493 trace_svcrdma_initdepth_err(newxprt, ret);
494 goto errout;
495 }
496 conn_param.private_data = &pmsg;
497 conn_param.private_data_len = sizeof(pmsg);
498 rdma_lock_handler(newxprt->sc_cm_id);
499 newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler;
500 ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
501 rdma_unlock_handler(newxprt->sc_cm_id);
502 if (ret) {
503 trace_svcrdma_accept_err(newxprt, ret);
504 goto errout;
505 }
506
507 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
508 dprintk("svcrdma: new connection %p accepted:\n", newxprt);
509 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
510 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap));
511 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
512 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap));
513 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges);
514 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth);
515 dprintk(" rdma_rw_ctxs : %d\n", ctxts);
516 dprintk(" max_requests : %d\n", newxprt->sc_max_requests);
517 dprintk(" ord : %d\n", conn_param.initiator_depth);
518 #endif
519
520 return &newxprt->sc_xprt;
521
522 errout:
523 /* Take a reference in case the DTO handler runs */
524 svc_xprt_get(&newxprt->sc_xprt);
525 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
526 ib_destroy_qp(newxprt->sc_qp);
527 rdma_destroy_id(newxprt->sc_cm_id);
528 /* This call to put will destroy the transport */
529 svc_xprt_put(&newxprt->sc_xprt);
530 return NULL;
531 }
532
533 static void svc_rdma_detach(struct svc_xprt *xprt)
534 {
535 struct svcxprt_rdma *rdma =
536 container_of(xprt, struct svcxprt_rdma, sc_xprt);
537
538 rdma_disconnect(rdma->sc_cm_id);
539 }
540
541 static void __svc_rdma_free(struct work_struct *work)
542 {
543 struct svcxprt_rdma *rdma =
544 container_of(work, struct svcxprt_rdma, sc_work);
545 struct svc_xprt *xprt = &rdma->sc_xprt;
546
547 /* This blocks until the Completion Queues are empty */
548 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
549 ib_drain_qp(rdma->sc_qp);
550
551 svc_rdma_flush_recv_queues(rdma);
552
553 /* Final put of backchannel client transport */
554 if (xprt->xpt_bc_xprt) {
555 xprt_put(xprt->xpt_bc_xprt);
556 xprt->xpt_bc_xprt = NULL;
557 }
558
559 svc_rdma_destroy_rw_ctxts(rdma);
560 svc_rdma_send_ctxts_destroy(rdma);
561 svc_rdma_recv_ctxts_destroy(rdma);
562
563 /* Destroy the QP if present (not a listener) */
564 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
565 ib_destroy_qp(rdma->sc_qp);
566
567 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
568 ib_free_cq(rdma->sc_sq_cq);
569
570 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
571 ib_free_cq(rdma->sc_rq_cq);
572
573 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
574 ib_dealloc_pd(rdma->sc_pd);
575
576 /* Destroy the CM ID */
577 rdma_destroy_id(rdma->sc_cm_id);
578
579 kfree(rdma);
580 }
581
582 static void svc_rdma_free(struct svc_xprt *xprt)
583 {
584 struct svcxprt_rdma *rdma =
585 container_of(xprt, struct svcxprt_rdma, sc_xprt);
586
587 INIT_WORK(&rdma->sc_work, __svc_rdma_free);
588 schedule_work(&rdma->sc_work);
589 }
590
591 static int svc_rdma_has_wspace(struct svc_xprt *xprt)
592 {
593 struct svcxprt_rdma *rdma =
594 container_of(xprt, struct svcxprt_rdma, sc_xprt);
595
596 /*
597 * If there are already waiters on the SQ,
598 * return false.
599 */
600 if (waitqueue_active(&rdma->sc_send_wait))
601 return 0;
602
603 /* Otherwise return true. */
604 return 1;
605 }
606
607 static void svc_rdma_secure_port(struct svc_rqst *rqstp)
608 {
609 set_bit(RQ_SECURE, &rqstp->rq_flags);
610 }
611
612 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt)
613 {
614 }
615
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