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/rpc_rdma.h> 59 #include <linux/sunrpc/svc_xprt.h> 60 #include <linux/sunrpc/svc_rdma.h> 61 62 #include "xprt_rdma.h" 63 #include <trace/events/rpcrdma.h> 64 65 #define RPCDBG_FACILITY RPCDBG_SVCXPRT 66 67 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 68 struct net *net); 69 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 70 struct net *net, 71 struct sockaddr *sa, int salen, 72 int flags); 73 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); 74 static void svc_rdma_detach(struct svc_xprt *xprt); 75 static void svc_rdma_free(struct svc_xprt *xprt); 76 static int svc_rdma_has_wspace(struct svc_xprt *xprt); 77 static void svc_rdma_secure_port(struct svc_rqst *); 78 static void svc_rdma_kill_temp_xprt(struct svc_xprt *); 79 80 static const struct svc_xprt_ops svc_rdma_ops = { 81 .xpo_create = svc_rdma_create, 82 .xpo_recvfrom = svc_rdma_recvfrom, 83 .xpo_sendto = svc_rdma_sendto, 84 .xpo_read_payload = svc_rdma_read_payload, 85 .xpo_release_rqst = svc_rdma_release_rqst, 86 .xpo_detach = svc_rdma_detach, 87 .xpo_free = svc_rdma_free, 88 .xpo_has_wspace = svc_rdma_has_wspace, 89 .xpo_accept = svc_rdma_accept, 90 .xpo_secure_port = svc_rdma_secure_port, 91 .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, 92 }; 93 94 struct svc_xprt_class svc_rdma_class = { 95 .xcl_name = "rdma", 96 .xcl_owner = THIS_MODULE, 97 .xcl_ops = &svc_rdma_ops, 98 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, 99 .xcl_ident = XPRT_TRANSPORT_RDMA, 100 }; 101 102 /* QP event handler */ 103 static void qp_event_handler(struct ib_event *event, void *context) 104 { 105 struct svc_xprt *xprt = context; 106 107 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); 108 switch (event->event) { 109 /* These are considered benign events */ 110 case IB_EVENT_PATH_MIG: 111 case IB_EVENT_COMM_EST: 112 case IB_EVENT_SQ_DRAINED: 113 case IB_EVENT_QP_LAST_WQE_REACHED: 114 break; 115 116 /* These are considered fatal events */ 117 case IB_EVENT_PATH_MIG_ERR: 118 case IB_EVENT_QP_FATAL: 119 case IB_EVENT_QP_REQ_ERR: 120 case IB_EVENT_QP_ACCESS_ERR: 121 case IB_EVENT_DEVICE_FATAL: 122 default: 123 set_bit(XPT_CLOSE, &xprt->xpt_flags); 124 svc_xprt_enqueue(xprt); 125 break; 126 } 127 } 128 129 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 130 struct net *net) 131 { 132 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); 133 134 if (!cma_xprt) { 135 dprintk("svcrdma: failed to create new transport\n"); 136 return NULL; 137 } 138 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); 139 INIT_LIST_HEAD(&cma_xprt->sc_accept_q); 140 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); 141 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); 142 INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts); 143 init_llist_head(&cma_xprt->sc_recv_ctxts); 144 INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); 145 init_waitqueue_head(&cma_xprt->sc_send_wait); 146 147 spin_lock_init(&cma_xprt->sc_lock); 148 spin_lock_init(&cma_xprt->sc_rq_dto_lock); 149 spin_lock_init(&cma_xprt->sc_send_lock); 150 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); 151 152 /* 153 * Note that this implies that the underlying transport support 154 * has some form of congestion control (see RFC 7530 section 3.1 155 * paragraph 2). For now, we assume that all supported RDMA 156 * transports are suitable here. 157 */ 158 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); 159 160 return cma_xprt; 161 } 162 163 static void 164 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, 165 struct rdma_conn_param *param) 166 { 167 const struct rpcrdma_connect_private *pmsg = param->private_data; 168 169 if (pmsg && 170 pmsg->cp_magic == rpcrdma_cmp_magic && 171 pmsg->cp_version == RPCRDMA_CMP_VERSION) { 172 newxprt->sc_snd_w_inv = pmsg->cp_flags & 173 RPCRDMA_CMP_F_SND_W_INV_OK; 174 175 dprintk("svcrdma: client send_size %u, recv_size %u " 176 "remote inv %ssupported\n", 177 rpcrdma_decode_buffer_size(pmsg->cp_send_size), 178 rpcrdma_decode_buffer_size(pmsg->cp_recv_size), 179 newxprt->sc_snd_w_inv ? "" : "un"); 180 } 181 } 182 183 /* 184 * This function handles the CONNECT_REQUEST event on a listening 185 * endpoint. It is passed the cma_id for the _new_ connection. The context in 186 * this cma_id is inherited from the listening cma_id and is the svc_xprt 187 * structure for the listening endpoint. 188 * 189 * This function creates a new xprt for the new connection and enqueues it on 190 * the accept queue for the listent xprt. When the listen thread is kicked, it 191 * will call the recvfrom method on the listen xprt which will accept the new 192 * connection. 193 */ 194 static void handle_connect_req(struct rdma_cm_id *new_cma_id, 195 struct rdma_conn_param *param) 196 { 197 struct svcxprt_rdma *listen_xprt = new_cma_id->context; 198 struct svcxprt_rdma *newxprt; 199 struct sockaddr *sa; 200 201 /* Create a new transport */ 202 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 203 listen_xprt->sc_xprt.xpt_net); 204 if (!newxprt) 205 return; 206 newxprt->sc_cm_id = new_cma_id; 207 new_cma_id->context = newxprt; 208 svc_rdma_parse_connect_private(newxprt, param); 209 210 /* Save client advertised inbound read limit for use later in accept. */ 211 newxprt->sc_ord = param->initiator_depth; 212 213 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 214 svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 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 * Handles events generated on the listening endpoint. These events will be 238 * either be incoming connect requests or adapter removal events. 239 */ 240 static int rdma_listen_handler(struct rdma_cm_id *cma_id, 241 struct rdma_cm_event *event) 242 { 243 switch (event->event) { 244 case RDMA_CM_EVENT_CONNECT_REQUEST: 245 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " 246 "event = %s (%d)\n", cma_id, cma_id->context, 247 rdma_event_msg(event->event), event->event); 248 handle_connect_req(cma_id, &event->param.conn); 249 break; 250 default: 251 /* NB: No device removal upcall for INADDR_ANY listeners */ 252 dprintk("svcrdma: Unexpected event on listening endpoint %p, " 253 "event = %s (%d)\n", cma_id, 254 rdma_event_msg(event->event), event->event); 255 break; 256 } 257 258 return 0; 259 } 260 261 static int rdma_cma_handler(struct rdma_cm_id *cma_id, 262 struct rdma_cm_event *event) 263 { 264 struct svcxprt_rdma *rdma = cma_id->context; 265 struct svc_xprt *xprt = &rdma->sc_xprt; 266 267 switch (event->event) { 268 case RDMA_CM_EVENT_ESTABLISHED: 269 /* Accept complete */ 270 svc_xprt_get(xprt); 271 dprintk("svcrdma: Connection completed on DTO xprt=%p, " 272 "cm_id=%p\n", xprt, cma_id); 273 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); 274 svc_xprt_enqueue(xprt); 275 break; 276 case RDMA_CM_EVENT_DISCONNECTED: 277 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", 278 xprt, cma_id); 279 set_bit(XPT_CLOSE, &xprt->xpt_flags); 280 svc_xprt_enqueue(xprt); 281 svc_xprt_put(xprt); 282 break; 283 case RDMA_CM_EVENT_DEVICE_REMOVAL: 284 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " 285 "event = %s (%d)\n", cma_id, xprt, 286 rdma_event_msg(event->event), event->event); 287 set_bit(XPT_CLOSE, &xprt->xpt_flags); 288 svc_xprt_enqueue(xprt); 289 svc_xprt_put(xprt); 290 break; 291 default: 292 dprintk("svcrdma: Unexpected event on DTO endpoint %p, " 293 "event = %s (%d)\n", cma_id, 294 rdma_event_msg(event->event), event->event); 295 break; 296 } 297 return 0; 298 } 299 300 /* 301 * Create a listening RDMA service endpoint. 302 */ 303 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 304 struct net *net, 305 struct sockaddr *sa, int salen, 306 int flags) 307 { 308 struct rdma_cm_id *listen_id; 309 struct svcxprt_rdma *cma_xprt; 310 int ret; 311 312 dprintk("svcrdma: Creating RDMA listener\n"); 313 if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { 314 dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); 315 return ERR_PTR(-EAFNOSUPPORT); 316 } 317 cma_xprt = svc_rdma_create_xprt(serv, net); 318 if (!cma_xprt) 319 return ERR_PTR(-ENOMEM); 320 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); 321 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); 322 323 listen_id = rdma_create_id(net, rdma_listen_handler, cma_xprt, 324 RDMA_PS_TCP, IB_QPT_RC); 325 if (IS_ERR(listen_id)) { 326 ret = PTR_ERR(listen_id); 327 dprintk("svcrdma: rdma_create_id failed = %d\n", ret); 328 goto err0; 329 } 330 331 /* Allow both IPv4 and IPv6 sockets to bind a single port 332 * at the same time. 333 */ 334 #if IS_ENABLED(CONFIG_IPV6) 335 ret = rdma_set_afonly(listen_id, 1); 336 if (ret) { 337 dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret); 338 goto err1; 339 } 340 #endif 341 ret = rdma_bind_addr(listen_id, sa); 342 if (ret) { 343 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); 344 goto err1; 345 } 346 cma_xprt->sc_cm_id = listen_id; 347 348 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); 349 if (ret) { 350 dprintk("svcrdma: rdma_listen failed = %d\n", ret); 351 goto err1; 352 } 353 354 /* 355 * We need to use the address from the cm_id in case the 356 * caller specified 0 for the port number. 357 */ 358 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; 359 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); 360 361 return &cma_xprt->sc_xprt; 362 363 err1: 364 rdma_destroy_id(listen_id); 365 err0: 366 kfree(cma_xprt); 367 return ERR_PTR(ret); 368 } 369 370 /* 371 * This is the xpo_recvfrom function for listening endpoints. Its 372 * purpose is to accept incoming connections. The CMA callback handler 373 * has already created a new transport and attached it to the new CMA 374 * ID. 375 * 376 * There is a queue of pending connections hung on the listening 377 * transport. This queue contains the new svc_xprt structure. This 378 * function takes svc_xprt structures off the accept_q and completes 379 * the connection. 380 */ 381 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) 382 { 383 struct svcxprt_rdma *listen_rdma; 384 struct svcxprt_rdma *newxprt = NULL; 385 struct rdma_conn_param conn_param; 386 struct rpcrdma_connect_private pmsg; 387 struct ib_qp_init_attr qp_attr; 388 unsigned int ctxts, rq_depth; 389 struct ib_device *dev; 390 int ret = 0; 391 RPC_IFDEBUG(struct sockaddr *sap); 392 393 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 394 clear_bit(XPT_CONN, &xprt->xpt_flags); 395 /* Get the next entry off the accept list */ 396 spin_lock(&listen_rdma->sc_lock); 397 if (!list_empty(&listen_rdma->sc_accept_q)) { 398 newxprt = list_entry(listen_rdma->sc_accept_q.next, 399 struct svcxprt_rdma, sc_accept_q); 400 list_del_init(&newxprt->sc_accept_q); 401 } 402 if (!list_empty(&listen_rdma->sc_accept_q)) 403 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); 404 spin_unlock(&listen_rdma->sc_lock); 405 if (!newxprt) 406 return NULL; 407 408 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", 409 newxprt, newxprt->sc_cm_id); 410 411 dev = newxprt->sc_cm_id->device; 412 newxprt->sc_port_num = newxprt->sc_cm_id->port_num; 413 414 /* Qualify the transport resource defaults with the 415 * capabilities of this particular device */ 416 /* Transport header, head iovec, tail iovec */ 417 newxprt->sc_max_send_sges = 3; 418 /* Add one SGE per page list entry */ 419 newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1; 420 if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) 421 newxprt->sc_max_send_sges = dev->attrs.max_send_sge; 422 newxprt->sc_max_req_size = svcrdma_max_req_size; 423 newxprt->sc_max_requests = svcrdma_max_requests; 424 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; 425 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; 426 if (rq_depth > dev->attrs.max_qp_wr) { 427 pr_warn("svcrdma: reducing receive depth to %d\n", 428 dev->attrs.max_qp_wr); 429 rq_depth = dev->attrs.max_qp_wr; 430 newxprt->sc_max_requests = rq_depth - 2; 431 newxprt->sc_max_bc_requests = 2; 432 } 433 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); 434 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); 435 ctxts *= newxprt->sc_max_requests; 436 newxprt->sc_sq_depth = rq_depth + ctxts; 437 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { 438 pr_warn("svcrdma: reducing send depth to %d\n", 439 dev->attrs.max_qp_wr); 440 newxprt->sc_sq_depth = dev->attrs.max_qp_wr; 441 } 442 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); 443 444 newxprt->sc_pd = ib_alloc_pd(dev, 0); 445 if (IS_ERR(newxprt->sc_pd)) { 446 dprintk("svcrdma: error creating PD for connect request\n"); 447 goto errout; 448 } 449 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth, 450 IB_POLL_WORKQUEUE); 451 if (IS_ERR(newxprt->sc_sq_cq)) { 452 dprintk("svcrdma: error creating SQ CQ for connect request\n"); 453 goto errout; 454 } 455 newxprt->sc_rq_cq = 456 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE); 457 if (IS_ERR(newxprt->sc_rq_cq)) { 458 dprintk("svcrdma: error creating RQ CQ for connect request\n"); 459 goto errout; 460 } 461 462 memset(&qp_attr, 0, sizeof qp_attr); 463 qp_attr.event_handler = qp_event_handler; 464 qp_attr.qp_context = &newxprt->sc_xprt; 465 qp_attr.port_num = newxprt->sc_port_num; 466 qp_attr.cap.max_rdma_ctxs = ctxts; 467 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; 468 qp_attr.cap.max_recv_wr = rq_depth; 469 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; 470 qp_attr.cap.max_recv_sge = 1; 471 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 472 qp_attr.qp_type = IB_QPT_RC; 473 qp_attr.send_cq = newxprt->sc_sq_cq; 474 qp_attr.recv_cq = newxprt->sc_rq_cq; 475 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", 476 newxprt->sc_cm_id, newxprt->sc_pd); 477 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", 478 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); 479 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", 480 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); 481 482 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); 483 if (ret) { 484 dprintk("svcrdma: failed to create QP, ret=%d\n", ret); 485 goto errout; 486 } 487 newxprt->sc_qp = newxprt->sc_cm_id->qp; 488 489 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) 490 newxprt->sc_snd_w_inv = false; 491 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && 492 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) 493 goto errout; 494 495 if (!svc_rdma_post_recvs(newxprt)) 496 goto errout; 497 498 /* Swap out the handler */ 499 newxprt->sc_cm_id->event_handler = rdma_cma_handler; 500 501 /* Construct RDMA-CM private message */ 502 pmsg.cp_magic = rpcrdma_cmp_magic; 503 pmsg.cp_version = RPCRDMA_CMP_VERSION; 504 pmsg.cp_flags = 0; 505 pmsg.cp_send_size = pmsg.cp_recv_size = 506 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); 507 508 /* Accept Connection */ 509 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); 510 memset(&conn_param, 0, sizeof conn_param); 511 conn_param.responder_resources = 0; 512 conn_param.initiator_depth = min_t(int, newxprt->sc_ord, 513 dev->attrs.max_qp_init_rd_atom); 514 if (!conn_param.initiator_depth) { 515 dprintk("svcrdma: invalid ORD setting\n"); 516 ret = -EINVAL; 517 goto errout; 518 } 519 conn_param.private_data = &pmsg; 520 conn_param.private_data_len = sizeof(pmsg); 521 ret = rdma_accept(newxprt->sc_cm_id, &conn_param); 522 if (ret) 523 goto errout; 524 525 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 526 dprintk("svcrdma: new connection %p accepted:\n", newxprt); 527 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 528 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); 529 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 530 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); 531 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); 532 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); 533 dprintk(" rdma_rw_ctxs : %d\n", ctxts); 534 dprintk(" max_requests : %d\n", newxprt->sc_max_requests); 535 dprintk(" ord : %d\n", conn_param.initiator_depth); 536 #endif 537 538 trace_svcrdma_xprt_accept(&newxprt->sc_xprt); 539 return &newxprt->sc_xprt; 540 541 errout: 542 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); 543 trace_svcrdma_xprt_fail(&newxprt->sc_xprt); 544 /* Take a reference in case the DTO handler runs */ 545 svc_xprt_get(&newxprt->sc_xprt); 546 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) 547 ib_destroy_qp(newxprt->sc_qp); 548 rdma_destroy_id(newxprt->sc_cm_id); 549 /* This call to put will destroy the transport */ 550 svc_xprt_put(&newxprt->sc_xprt); 551 return NULL; 552 } 553 554 /* 555 * When connected, an svc_xprt has at least two references: 556 * 557 * - A reference held by the cm_id between the ESTABLISHED and 558 * DISCONNECTED events. If the remote peer disconnected first, this 559 * reference could be gone. 560 * 561 * - A reference held by the svc_recv code that called this function 562 * as part of close processing. 563 * 564 * At a minimum one references should still be held. 565 */ 566 static void svc_rdma_detach(struct svc_xprt *xprt) 567 { 568 struct svcxprt_rdma *rdma = 569 container_of(xprt, struct svcxprt_rdma, sc_xprt); 570 571 /* Disconnect and flush posted WQE */ 572 rdma_disconnect(rdma->sc_cm_id); 573 } 574 575 static void __svc_rdma_free(struct work_struct *work) 576 { 577 struct svcxprt_rdma *rdma = 578 container_of(work, struct svcxprt_rdma, sc_work); 579 struct svc_xprt *xprt = &rdma->sc_xprt; 580 581 trace_svcrdma_xprt_free(xprt); 582 583 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 584 ib_drain_qp(rdma->sc_qp); 585 586 svc_rdma_flush_recv_queues(rdma); 587 588 /* Final put of backchannel client transport */ 589 if (xprt->xpt_bc_xprt) { 590 xprt_put(xprt->xpt_bc_xprt); 591 xprt->xpt_bc_xprt = NULL; 592 } 593 594 svc_rdma_destroy_rw_ctxts(rdma); 595 svc_rdma_send_ctxts_destroy(rdma); 596 svc_rdma_recv_ctxts_destroy(rdma); 597 598 /* Destroy the QP if present (not a listener) */ 599 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 600 ib_destroy_qp(rdma->sc_qp); 601 602 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) 603 ib_free_cq(rdma->sc_sq_cq); 604 605 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) 606 ib_free_cq(rdma->sc_rq_cq); 607 608 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) 609 ib_dealloc_pd(rdma->sc_pd); 610 611 /* Destroy the CM ID */ 612 rdma_destroy_id(rdma->sc_cm_id); 613 614 kfree(rdma); 615 } 616 617 static void svc_rdma_free(struct svc_xprt *xprt) 618 { 619 struct svcxprt_rdma *rdma = 620 container_of(xprt, struct svcxprt_rdma, sc_xprt); 621 622 INIT_WORK(&rdma->sc_work, __svc_rdma_free); 623 schedule_work(&rdma->sc_work); 624 } 625 626 static int svc_rdma_has_wspace(struct svc_xprt *xprt) 627 { 628 struct svcxprt_rdma *rdma = 629 container_of(xprt, struct svcxprt_rdma, sc_xprt); 630 631 /* 632 * If there are already waiters on the SQ, 633 * return false. 634 */ 635 if (waitqueue_active(&rdma->sc_send_wait)) 636 return 0; 637 638 /* Otherwise return true. */ 639 return 1; 640 } 641 642 static void svc_rdma_secure_port(struct svc_rqst *rqstp) 643 { 644 set_bit(RQ_SECURE, &rqstp->rq_flags); 645 } 646 647 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) 648 { 649 } 650