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, int node); 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_kill_temp_xprt(struct svc_xprt *); 77 78 static const struct svc_xprt_ops svc_rdma_ops = { 79 .xpo_create = svc_rdma_create, 80 .xpo_recvfrom = svc_rdma_recvfrom, 81 .xpo_sendto = svc_rdma_sendto, 82 .xpo_result_payload = svc_rdma_result_payload, 83 .xpo_release_ctxt = svc_rdma_release_ctxt, 84 .xpo_detach = svc_rdma_detach, 85 .xpo_free = svc_rdma_free, 86 .xpo_has_wspace = svc_rdma_has_wspace, 87 .xpo_accept = svc_rdma_accept, 88 .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, 89 }; 90 91 struct svc_xprt_class svc_rdma_class = { 92 .xcl_name = "rdma", 93 .xcl_owner = THIS_MODULE, 94 .xcl_ops = &svc_rdma_ops, 95 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, 96 .xcl_ident = XPRT_TRANSPORT_RDMA, 97 }; 98 99 /* QP event handler */ 100 static void qp_event_handler(struct ib_event *event, void *context) 101 { 102 struct svc_xprt *xprt = context; 103 104 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); 105 switch (event->event) { 106 /* These are considered benign events */ 107 case IB_EVENT_PATH_MIG: 108 case IB_EVENT_COMM_EST: 109 case IB_EVENT_SQ_DRAINED: 110 case IB_EVENT_QP_LAST_WQE_REACHED: 111 break; 112 113 /* These are considered fatal events */ 114 case IB_EVENT_PATH_MIG_ERR: 115 case IB_EVENT_QP_FATAL: 116 case IB_EVENT_QP_REQ_ERR: 117 case IB_EVENT_QP_ACCESS_ERR: 118 case IB_EVENT_DEVICE_FATAL: 119 default: 120 svc_xprt_deferred_close(xprt); 121 break; 122 } 123 } 124 125 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 126 struct net *net, int node) 127 { 128 struct svcxprt_rdma *cma_xprt; 129 130 cma_xprt = kzalloc_node(sizeof(*cma_xprt), GFP_KERNEL, node); 131 if (!cma_xprt) 132 return NULL; 133 134 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); 135 INIT_LIST_HEAD(&cma_xprt->sc_accept_q); 136 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); 137 init_llist_head(&cma_xprt->sc_send_ctxts); 138 init_llist_head(&cma_xprt->sc_recv_ctxts); 139 init_llist_head(&cma_xprt->sc_rw_ctxts); 140 init_waitqueue_head(&cma_xprt->sc_send_wait); 141 142 spin_lock_init(&cma_xprt->sc_lock); 143 spin_lock_init(&cma_xprt->sc_rq_dto_lock); 144 spin_lock_init(&cma_xprt->sc_send_lock); 145 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); 146 147 /* 148 * Note that this implies that the underlying transport support 149 * has some form of congestion control (see RFC 7530 section 3.1 150 * paragraph 2). For now, we assume that all supported RDMA 151 * transports are suitable here. 152 */ 153 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); 154 155 return cma_xprt; 156 } 157 158 static void 159 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, 160 struct rdma_conn_param *param) 161 { 162 const struct rpcrdma_connect_private *pmsg = param->private_data; 163 164 if (pmsg && 165 pmsg->cp_magic == rpcrdma_cmp_magic && 166 pmsg->cp_version == RPCRDMA_CMP_VERSION) { 167 newxprt->sc_snd_w_inv = pmsg->cp_flags & 168 RPCRDMA_CMP_F_SND_W_INV_OK; 169 170 dprintk("svcrdma: client send_size %u, recv_size %u " 171 "remote inv %ssupported\n", 172 rpcrdma_decode_buffer_size(pmsg->cp_send_size), 173 rpcrdma_decode_buffer_size(pmsg->cp_recv_size), 174 newxprt->sc_snd_w_inv ? "" : "un"); 175 } 176 } 177 178 /* 179 * This function handles the CONNECT_REQUEST event on a listening 180 * endpoint. It is passed the cma_id for the _new_ connection. The context in 181 * this cma_id is inherited from the listening cma_id and is the svc_xprt 182 * structure for the listening endpoint. 183 * 184 * This function creates a new xprt for the new connection and enqueues it on 185 * the accept queue for the listent xprt. When the listen thread is kicked, it 186 * will call the recvfrom method on the listen xprt which will accept the new 187 * connection. 188 */ 189 static void handle_connect_req(struct rdma_cm_id *new_cma_id, 190 struct rdma_conn_param *param) 191 { 192 struct svcxprt_rdma *listen_xprt = new_cma_id->context; 193 struct svcxprt_rdma *newxprt; 194 struct sockaddr *sa; 195 196 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 197 listen_xprt->sc_xprt.xpt_net, 198 ibdev_to_node(new_cma_id->device)); 199 if (!newxprt) 200 return; 201 newxprt->sc_cm_id = new_cma_id; 202 new_cma_id->context = newxprt; 203 svc_rdma_parse_connect_private(newxprt, param); 204 205 /* Save client advertised inbound read limit for use later in accept. */ 206 newxprt->sc_ord = param->initiator_depth; 207 208 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 209 newxprt->sc_xprt.xpt_remotelen = svc_addr_len(sa); 210 memcpy(&newxprt->sc_xprt.xpt_remote, sa, 211 newxprt->sc_xprt.xpt_remotelen); 212 snprintf(newxprt->sc_xprt.xpt_remotebuf, 213 sizeof(newxprt->sc_xprt.xpt_remotebuf) - 1, "%pISc", sa); 214 215 /* The remote port is arbitrary and not under the control of the 216 * client ULP. Set it to a fixed value so that the DRC continues 217 * to be effective after a reconnect. 218 */ 219 rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0); 220 221 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 222 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 223 224 /* 225 * Enqueue the new transport on the accept queue of the listening 226 * transport 227 */ 228 spin_lock(&listen_xprt->sc_lock); 229 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); 230 spin_unlock(&listen_xprt->sc_lock); 231 232 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); 233 svc_xprt_enqueue(&listen_xprt->sc_xprt); 234 } 235 236 /** 237 * svc_rdma_listen_handler - Handle CM events generated on a listening endpoint 238 * @cma_id: the server's listener rdma_cm_id 239 * @event: details of the event 240 * 241 * Return values: 242 * %0: Do not destroy @cma_id 243 * %1: Destroy @cma_id (never returned here) 244 * 245 * NB: There is never a DEVICE_REMOVAL event for INADDR_ANY listeners. 246 */ 247 static int svc_rdma_listen_handler(struct rdma_cm_id *cma_id, 248 struct rdma_cm_event *event) 249 { 250 switch (event->event) { 251 case RDMA_CM_EVENT_CONNECT_REQUEST: 252 handle_connect_req(cma_id, &event->param.conn); 253 break; 254 default: 255 break; 256 } 257 return 0; 258 } 259 260 /** 261 * svc_rdma_cma_handler - Handle CM events on client connections 262 * @cma_id: the server's listener rdma_cm_id 263 * @event: details of the event 264 * 265 * Return values: 266 * %0: Do not destroy @cma_id 267 * %1: Destroy @cma_id (never returned here) 268 */ 269 static int svc_rdma_cma_handler(struct rdma_cm_id *cma_id, 270 struct rdma_cm_event *event) 271 { 272 struct svcxprt_rdma *rdma = cma_id->context; 273 struct svc_xprt *xprt = &rdma->sc_xprt; 274 275 switch (event->event) { 276 case RDMA_CM_EVENT_ESTABLISHED: 277 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); 278 279 /* Handle any requests that were received while 280 * CONN_PENDING was set. */ 281 svc_xprt_enqueue(xprt); 282 break; 283 case RDMA_CM_EVENT_DISCONNECTED: 284 case RDMA_CM_EVENT_DEVICE_REMOVAL: 285 svc_xprt_deferred_close(xprt); 286 break; 287 default: 288 break; 289 } 290 return 0; 291 } 292 293 /* 294 * Create a listening RDMA service endpoint. 295 */ 296 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 297 struct net *net, 298 struct sockaddr *sa, int salen, 299 int flags) 300 { 301 struct rdma_cm_id *listen_id; 302 struct svcxprt_rdma *cma_xprt; 303 int ret; 304 305 if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) 306 return ERR_PTR(-EAFNOSUPPORT); 307 cma_xprt = svc_rdma_create_xprt(serv, net, NUMA_NO_NODE); 308 if (!cma_xprt) 309 return ERR_PTR(-ENOMEM); 310 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); 311 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); 312 313 listen_id = rdma_create_id(net, svc_rdma_listen_handler, cma_xprt, 314 RDMA_PS_TCP, IB_QPT_RC); 315 if (IS_ERR(listen_id)) { 316 ret = PTR_ERR(listen_id); 317 goto err0; 318 } 319 320 /* Allow both IPv4 and IPv6 sockets to bind a single port 321 * at the same time. 322 */ 323 #if IS_ENABLED(CONFIG_IPV6) 324 ret = rdma_set_afonly(listen_id, 1); 325 if (ret) 326 goto err1; 327 #endif 328 ret = rdma_bind_addr(listen_id, sa); 329 if (ret) 330 goto err1; 331 cma_xprt->sc_cm_id = listen_id; 332 333 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); 334 if (ret) 335 goto err1; 336 337 /* 338 * We need to use the address from the cm_id in case the 339 * caller specified 0 for the port number. 340 */ 341 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; 342 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); 343 344 return &cma_xprt->sc_xprt; 345 346 err1: 347 rdma_destroy_id(listen_id); 348 err0: 349 kfree(cma_xprt); 350 return ERR_PTR(ret); 351 } 352 353 /* 354 * This is the xpo_recvfrom function for listening endpoints. Its 355 * purpose is to accept incoming connections. The CMA callback handler 356 * has already created a new transport and attached it to the new CMA 357 * ID. 358 * 359 * There is a queue of pending connections hung on the listening 360 * transport. This queue contains the new svc_xprt structure. This 361 * function takes svc_xprt structures off the accept_q and completes 362 * the connection. 363 */ 364 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) 365 { 366 struct svcxprt_rdma *listen_rdma; 367 struct svcxprt_rdma *newxprt = NULL; 368 struct rdma_conn_param conn_param; 369 struct rpcrdma_connect_private pmsg; 370 struct ib_qp_init_attr qp_attr; 371 unsigned int ctxts, rq_depth; 372 struct ib_device *dev; 373 int ret = 0; 374 RPC_IFDEBUG(struct sockaddr *sap); 375 376 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 377 clear_bit(XPT_CONN, &xprt->xpt_flags); 378 /* Get the next entry off the accept list */ 379 spin_lock(&listen_rdma->sc_lock); 380 if (!list_empty(&listen_rdma->sc_accept_q)) { 381 newxprt = list_entry(listen_rdma->sc_accept_q.next, 382 struct svcxprt_rdma, sc_accept_q); 383 list_del_init(&newxprt->sc_accept_q); 384 } 385 if (!list_empty(&listen_rdma->sc_accept_q)) 386 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); 387 spin_unlock(&listen_rdma->sc_lock); 388 if (!newxprt) 389 return NULL; 390 391 dev = newxprt->sc_cm_id->device; 392 newxprt->sc_port_num = newxprt->sc_cm_id->port_num; 393 394 /* Qualify the transport resource defaults with the 395 * capabilities of this particular device */ 396 /* Transport header, head iovec, tail iovec */ 397 newxprt->sc_max_send_sges = 3; 398 /* Add one SGE per page list entry */ 399 newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1; 400 if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) 401 newxprt->sc_max_send_sges = dev->attrs.max_send_sge; 402 newxprt->sc_max_req_size = svcrdma_max_req_size; 403 newxprt->sc_max_requests = svcrdma_max_requests; 404 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; 405 newxprt->sc_recv_batch = RPCRDMA_MAX_RECV_BATCH; 406 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests + 407 newxprt->sc_recv_batch; 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_recv_batch = 1; 413 newxprt->sc_max_requests = rq_depth - 2; 414 newxprt->sc_max_bc_requests = 2; 415 } 416 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); 417 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); 418 ctxts *= newxprt->sc_max_requests; 419 newxprt->sc_sq_depth = rq_depth + ctxts; 420 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { 421 pr_warn("svcrdma: reducing send depth to %d\n", 422 dev->attrs.max_qp_wr); 423 newxprt->sc_sq_depth = dev->attrs.max_qp_wr; 424 } 425 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); 426 427 newxprt->sc_pd = ib_alloc_pd(dev, 0); 428 if (IS_ERR(newxprt->sc_pd)) { 429 trace_svcrdma_pd_err(newxprt, PTR_ERR(newxprt->sc_pd)); 430 goto errout; 431 } 432 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth, 433 IB_POLL_WORKQUEUE); 434 if (IS_ERR(newxprt->sc_sq_cq)) 435 goto errout; 436 newxprt->sc_rq_cq = 437 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE); 438 if (IS_ERR(newxprt->sc_rq_cq)) 439 goto errout; 440 441 memset(&qp_attr, 0, sizeof qp_attr); 442 qp_attr.event_handler = qp_event_handler; 443 qp_attr.qp_context = &newxprt->sc_xprt; 444 qp_attr.port_num = newxprt->sc_port_num; 445 qp_attr.cap.max_rdma_ctxs = ctxts; 446 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; 447 qp_attr.cap.max_recv_wr = rq_depth; 448 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; 449 qp_attr.cap.max_recv_sge = 1; 450 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 451 qp_attr.qp_type = IB_QPT_RC; 452 qp_attr.send_cq = newxprt->sc_sq_cq; 453 qp_attr.recv_cq = newxprt->sc_rq_cq; 454 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", 455 newxprt->sc_cm_id, newxprt->sc_pd); 456 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", 457 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); 458 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", 459 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); 460 461 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); 462 if (ret) { 463 trace_svcrdma_qp_err(newxprt, ret); 464 goto errout; 465 } 466 newxprt->sc_qp = newxprt->sc_cm_id->qp; 467 468 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) 469 newxprt->sc_snd_w_inv = false; 470 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && 471 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) { 472 trace_svcrdma_fabric_err(newxprt, -EINVAL); 473 goto errout; 474 } 475 476 if (!svc_rdma_post_recvs(newxprt)) 477 goto errout; 478 479 /* Construct RDMA-CM private message */ 480 pmsg.cp_magic = rpcrdma_cmp_magic; 481 pmsg.cp_version = RPCRDMA_CMP_VERSION; 482 pmsg.cp_flags = 0; 483 pmsg.cp_send_size = pmsg.cp_recv_size = 484 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); 485 486 /* Accept Connection */ 487 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); 488 memset(&conn_param, 0, sizeof conn_param); 489 conn_param.responder_resources = 0; 490 conn_param.initiator_depth = min_t(int, newxprt->sc_ord, 491 dev->attrs.max_qp_init_rd_atom); 492 if (!conn_param.initiator_depth) { 493 ret = -EINVAL; 494 trace_svcrdma_initdepth_err(newxprt, ret); 495 goto errout; 496 } 497 conn_param.private_data = &pmsg; 498 conn_param.private_data_len = sizeof(pmsg); 499 rdma_lock_handler(newxprt->sc_cm_id); 500 newxprt->sc_cm_id->event_handler = svc_rdma_cma_handler; 501 ret = rdma_accept(newxprt->sc_cm_id, &conn_param); 502 rdma_unlock_handler(newxprt->sc_cm_id); 503 if (ret) { 504 trace_svcrdma_accept_err(newxprt, ret); 505 goto errout; 506 } 507 508 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 509 dprintk("svcrdma: new connection %p accepted:\n", newxprt); 510 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 511 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); 512 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 513 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); 514 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); 515 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); 516 dprintk(" rdma_rw_ctxs : %d\n", ctxts); 517 dprintk(" max_requests : %d\n", newxprt->sc_max_requests); 518 dprintk(" ord : %d\n", conn_param.initiator_depth); 519 #endif 520 521 return &newxprt->sc_xprt; 522 523 errout: 524 /* Take a reference in case the DTO handler runs */ 525 svc_xprt_get(&newxprt->sc_xprt); 526 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) 527 ib_destroy_qp(newxprt->sc_qp); 528 rdma_destroy_id(newxprt->sc_cm_id); 529 /* This call to put will destroy the transport */ 530 svc_xprt_put(&newxprt->sc_xprt); 531 return NULL; 532 } 533 534 static void svc_rdma_detach(struct svc_xprt *xprt) 535 { 536 struct svcxprt_rdma *rdma = 537 container_of(xprt, struct svcxprt_rdma, sc_xprt); 538 539 rdma_disconnect(rdma->sc_cm_id); 540 } 541 542 static void __svc_rdma_free(struct work_struct *work) 543 { 544 struct svcxprt_rdma *rdma = 545 container_of(work, struct svcxprt_rdma, sc_work); 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 svc_rdma_destroy_rw_ctxts(rdma); 554 svc_rdma_send_ctxts_destroy(rdma); 555 svc_rdma_recv_ctxts_destroy(rdma); 556 557 /* Destroy the QP if present (not a listener) */ 558 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 559 ib_destroy_qp(rdma->sc_qp); 560 561 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) 562 ib_free_cq(rdma->sc_sq_cq); 563 564 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) 565 ib_free_cq(rdma->sc_rq_cq); 566 567 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) 568 ib_dealloc_pd(rdma->sc_pd); 569 570 /* Destroy the CM ID */ 571 rdma_destroy_id(rdma->sc_cm_id); 572 573 kfree(rdma); 574 } 575 576 static void svc_rdma_free(struct svc_xprt *xprt) 577 { 578 struct svcxprt_rdma *rdma = 579 container_of(xprt, struct svcxprt_rdma, sc_xprt); 580 581 INIT_WORK(&rdma->sc_work, __svc_rdma_free); 582 schedule_work(&rdma->sc_work); 583 } 584 585 static int svc_rdma_has_wspace(struct svc_xprt *xprt) 586 { 587 struct svcxprt_rdma *rdma = 588 container_of(xprt, struct svcxprt_rdma, sc_xprt); 589 590 /* 591 * If there are already waiters on the SQ, 592 * return false. 593 */ 594 if (waitqueue_active(&rdma->sc_send_wait)) 595 return 0; 596 597 /* Otherwise return true. */ 598 return 1; 599 } 600 601 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) 602 { 603 } 604