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