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_release_rqst(struct svc_rqst *); 75 static void svc_rdma_detach(struct svc_xprt *xprt); 76 static void svc_rdma_free(struct svc_xprt *xprt); 77 static int svc_rdma_has_wspace(struct svc_xprt *xprt); 78 static void svc_rdma_secure_port(struct svc_rqst *); 79 static void svc_rdma_kill_temp_xprt(struct svc_xprt *); 80 81 static const struct svc_xprt_ops svc_rdma_ops = { 82 .xpo_create = svc_rdma_create, 83 .xpo_recvfrom = svc_rdma_recvfrom, 84 .xpo_sendto = svc_rdma_sendto, 85 .xpo_read_payload = svc_rdma_read_payload, 86 .xpo_release_rqst = svc_rdma_release_rqst, 87 .xpo_detach = svc_rdma_detach, 88 .xpo_free = svc_rdma_free, 89 .xpo_has_wspace = svc_rdma_has_wspace, 90 .xpo_accept = svc_rdma_accept, 91 .xpo_secure_port = svc_rdma_secure_port, 92 .xpo_kill_temp_xprt = svc_rdma_kill_temp_xprt, 93 }; 94 95 struct svc_xprt_class svc_rdma_class = { 96 .xcl_name = "rdma", 97 .xcl_owner = THIS_MODULE, 98 .xcl_ops = &svc_rdma_ops, 99 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, 100 .xcl_ident = XPRT_TRANSPORT_RDMA, 101 }; 102 103 /* QP event handler */ 104 static void qp_event_handler(struct ib_event *event, void *context) 105 { 106 struct svc_xprt *xprt = context; 107 108 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); 109 switch (event->event) { 110 /* These are considered benign events */ 111 case IB_EVENT_PATH_MIG: 112 case IB_EVENT_COMM_EST: 113 case IB_EVENT_SQ_DRAINED: 114 case IB_EVENT_QP_LAST_WQE_REACHED: 115 break; 116 117 /* These are considered fatal events */ 118 case IB_EVENT_PATH_MIG_ERR: 119 case IB_EVENT_QP_FATAL: 120 case IB_EVENT_QP_REQ_ERR: 121 case IB_EVENT_QP_ACCESS_ERR: 122 case IB_EVENT_DEVICE_FATAL: 123 default: 124 set_bit(XPT_CLOSE, &xprt->xpt_flags); 125 svc_xprt_enqueue(xprt); 126 break; 127 } 128 } 129 130 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 131 struct net *net) 132 { 133 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); 134 135 if (!cma_xprt) { 136 dprintk("svcrdma: failed to create new transport\n"); 137 return NULL; 138 } 139 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); 140 INIT_LIST_HEAD(&cma_xprt->sc_accept_q); 141 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); 142 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); 143 INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts); 144 init_llist_head(&cma_xprt->sc_recv_ctxts); 145 INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); 146 init_waitqueue_head(&cma_xprt->sc_send_wait); 147 148 spin_lock_init(&cma_xprt->sc_lock); 149 spin_lock_init(&cma_xprt->sc_rq_dto_lock); 150 spin_lock_init(&cma_xprt->sc_send_lock); 151 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); 152 153 /* 154 * Note that this implies that the underlying transport support 155 * has some form of congestion control (see RFC 7530 section 3.1 156 * paragraph 2). For now, we assume that all supported RDMA 157 * transports are suitable here. 158 */ 159 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); 160 161 return cma_xprt; 162 } 163 164 static void 165 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, 166 struct rdma_conn_param *param) 167 { 168 const struct rpcrdma_connect_private *pmsg = param->private_data; 169 170 if (pmsg && 171 pmsg->cp_magic == rpcrdma_cmp_magic && 172 pmsg->cp_version == RPCRDMA_CMP_VERSION) { 173 newxprt->sc_snd_w_inv = pmsg->cp_flags & 174 RPCRDMA_CMP_F_SND_W_INV_OK; 175 176 dprintk("svcrdma: client send_size %u, recv_size %u " 177 "remote inv %ssupported\n", 178 rpcrdma_decode_buffer_size(pmsg->cp_send_size), 179 rpcrdma_decode_buffer_size(pmsg->cp_recv_size), 180 newxprt->sc_snd_w_inv ? "" : "un"); 181 } 182 } 183 184 /* 185 * This function handles the CONNECT_REQUEST event on a listening 186 * endpoint. It is passed the cma_id for the _new_ connection. The context in 187 * this cma_id is inherited from the listening cma_id and is the svc_xprt 188 * structure for the listening endpoint. 189 * 190 * This function creates a new xprt for the new connection and enqueues it on 191 * the accept queue for the listent xprt. When the listen thread is kicked, it 192 * will call the recvfrom method on the listen xprt which will accept the new 193 * connection. 194 */ 195 static void handle_connect_req(struct rdma_cm_id *new_cma_id, 196 struct rdma_conn_param *param) 197 { 198 struct svcxprt_rdma *listen_xprt = new_cma_id->context; 199 struct svcxprt_rdma *newxprt; 200 struct sockaddr *sa; 201 202 /* Create a new transport */ 203 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 204 listen_xprt->sc_xprt.xpt_net); 205 if (!newxprt) 206 return; 207 newxprt->sc_cm_id = new_cma_id; 208 new_cma_id->context = newxprt; 209 svc_rdma_parse_connect_private(newxprt, param); 210 211 /* Save client advertised inbound read limit for use later in accept. */ 212 newxprt->sc_ord = param->initiator_depth; 213 214 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 215 svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 216 /* The remote port is arbitrary and not under the control of the 217 * client ULP. Set it to a fixed value so that the DRC continues 218 * to be effective after a reconnect. 219 */ 220 rpc_set_port((struct sockaddr *)&newxprt->sc_xprt.xpt_remote, 0); 221 222 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 223 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 224 225 /* 226 * Enqueue the new transport on the accept queue of the listening 227 * transport 228 */ 229 spin_lock(&listen_xprt->sc_lock); 230 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); 231 spin_unlock(&listen_xprt->sc_lock); 232 233 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); 234 svc_xprt_enqueue(&listen_xprt->sc_xprt); 235 } 236 237 /* 238 * Handles events generated on the listening endpoint. These events will be 239 * either be incoming connect requests or adapter removal events. 240 */ 241 static int rdma_listen_handler(struct rdma_cm_id *cma_id, 242 struct rdma_cm_event *event) 243 { 244 switch (event->event) { 245 case RDMA_CM_EVENT_CONNECT_REQUEST: 246 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " 247 "event = %s (%d)\n", cma_id, cma_id->context, 248 rdma_event_msg(event->event), event->event); 249 handle_connect_req(cma_id, &event->param.conn); 250 break; 251 default: 252 /* NB: No device removal upcall for INADDR_ANY listeners */ 253 dprintk("svcrdma: Unexpected event on listening endpoint %p, " 254 "event = %s (%d)\n", cma_id, 255 rdma_event_msg(event->event), event->event); 256 break; 257 } 258 259 return 0; 260 } 261 262 static int rdma_cma_handler(struct rdma_cm_id *cma_id, 263 struct rdma_cm_event *event) 264 { 265 struct svcxprt_rdma *rdma = cma_id->context; 266 struct svc_xprt *xprt = &rdma->sc_xprt; 267 268 switch (event->event) { 269 case RDMA_CM_EVENT_ESTABLISHED: 270 /* Accept complete */ 271 svc_xprt_get(xprt); 272 dprintk("svcrdma: Connection completed on DTO xprt=%p, " 273 "cm_id=%p\n", xprt, cma_id); 274 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); 275 svc_xprt_enqueue(xprt); 276 break; 277 case RDMA_CM_EVENT_DISCONNECTED: 278 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", 279 xprt, cma_id); 280 set_bit(XPT_CLOSE, &xprt->xpt_flags); 281 svc_xprt_enqueue(xprt); 282 svc_xprt_put(xprt); 283 break; 284 case RDMA_CM_EVENT_DEVICE_REMOVAL: 285 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " 286 "event = %s (%d)\n", cma_id, xprt, 287 rdma_event_msg(event->event), event->event); 288 set_bit(XPT_CLOSE, &xprt->xpt_flags); 289 svc_xprt_enqueue(xprt); 290 svc_xprt_put(xprt); 291 break; 292 default: 293 dprintk("svcrdma: Unexpected event on DTO endpoint %p, " 294 "event = %s (%d)\n", cma_id, 295 rdma_event_msg(event->event), event->event); 296 break; 297 } 298 return 0; 299 } 300 301 /* 302 * Create a listening RDMA service endpoint. 303 */ 304 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 305 struct net *net, 306 struct sockaddr *sa, int salen, 307 int flags) 308 { 309 struct rdma_cm_id *listen_id; 310 struct svcxprt_rdma *cma_xprt; 311 int ret; 312 313 dprintk("svcrdma: Creating RDMA listener\n"); 314 if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { 315 dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); 316 return ERR_PTR(-EAFNOSUPPORT); 317 } 318 cma_xprt = svc_rdma_create_xprt(serv, net); 319 if (!cma_xprt) 320 return ERR_PTR(-ENOMEM); 321 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); 322 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); 323 324 listen_id = rdma_create_id(net, rdma_listen_handler, cma_xprt, 325 RDMA_PS_TCP, IB_QPT_RC); 326 if (IS_ERR(listen_id)) { 327 ret = PTR_ERR(listen_id); 328 dprintk("svcrdma: rdma_create_id failed = %d\n", ret); 329 goto err0; 330 } 331 332 /* Allow both IPv4 and IPv6 sockets to bind a single port 333 * at the same time. 334 */ 335 #if IS_ENABLED(CONFIG_IPV6) 336 ret = rdma_set_afonly(listen_id, 1); 337 if (ret) { 338 dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret); 339 goto err1; 340 } 341 #endif 342 ret = rdma_bind_addr(listen_id, sa); 343 if (ret) { 344 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); 345 goto err1; 346 } 347 cma_xprt->sc_cm_id = listen_id; 348 349 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); 350 if (ret) { 351 dprintk("svcrdma: rdma_listen failed = %d\n", ret); 352 goto err1; 353 } 354 355 /* 356 * We need to use the address from the cm_id in case the 357 * caller specified 0 for the port number. 358 */ 359 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; 360 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); 361 362 return &cma_xprt->sc_xprt; 363 364 err1: 365 rdma_destroy_id(listen_id); 366 err0: 367 kfree(cma_xprt); 368 return ERR_PTR(ret); 369 } 370 371 /* 372 * This is the xpo_recvfrom function for listening endpoints. Its 373 * purpose is to accept incoming connections. The CMA callback handler 374 * has already created a new transport and attached it to the new CMA 375 * ID. 376 * 377 * There is a queue of pending connections hung on the listening 378 * transport. This queue contains the new svc_xprt structure. This 379 * function takes svc_xprt structures off the accept_q and completes 380 * the connection. 381 */ 382 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) 383 { 384 struct svcxprt_rdma *listen_rdma; 385 struct svcxprt_rdma *newxprt = NULL; 386 struct rdma_conn_param conn_param; 387 struct rpcrdma_connect_private pmsg; 388 struct ib_qp_init_attr qp_attr; 389 unsigned int ctxts, rq_depth; 390 struct ib_device *dev; 391 int ret = 0; 392 RPC_IFDEBUG(struct sockaddr *sap); 393 394 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 395 clear_bit(XPT_CONN, &xprt->xpt_flags); 396 /* Get the next entry off the accept list */ 397 spin_lock(&listen_rdma->sc_lock); 398 if (!list_empty(&listen_rdma->sc_accept_q)) { 399 newxprt = list_entry(listen_rdma->sc_accept_q.next, 400 struct svcxprt_rdma, sc_accept_q); 401 list_del_init(&newxprt->sc_accept_q); 402 } 403 if (!list_empty(&listen_rdma->sc_accept_q)) 404 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); 405 spin_unlock(&listen_rdma->sc_lock); 406 if (!newxprt) 407 return NULL; 408 409 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", 410 newxprt, newxprt->sc_cm_id); 411 412 dev = newxprt->sc_cm_id->device; 413 newxprt->sc_port_num = newxprt->sc_cm_id->port_num; 414 415 /* Qualify the transport resource defaults with the 416 * capabilities of this particular device */ 417 /* Transport header, head iovec, tail iovec */ 418 newxprt->sc_max_send_sges = 3; 419 /* Add one SGE per page list entry */ 420 newxprt->sc_max_send_sges += (svcrdma_max_req_size / PAGE_SIZE) + 1; 421 if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge) 422 newxprt->sc_max_send_sges = dev->attrs.max_send_sge; 423 newxprt->sc_max_req_size = svcrdma_max_req_size; 424 newxprt->sc_max_requests = svcrdma_max_requests; 425 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; 426 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; 427 if (rq_depth > dev->attrs.max_qp_wr) { 428 pr_warn("svcrdma: reducing receive depth to %d\n", 429 dev->attrs.max_qp_wr); 430 rq_depth = dev->attrs.max_qp_wr; 431 newxprt->sc_max_requests = rq_depth - 2; 432 newxprt->sc_max_bc_requests = 2; 433 } 434 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); 435 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); 436 ctxts *= newxprt->sc_max_requests; 437 newxprt->sc_sq_depth = rq_depth + ctxts; 438 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { 439 pr_warn("svcrdma: reducing send depth to %d\n", 440 dev->attrs.max_qp_wr); 441 newxprt->sc_sq_depth = dev->attrs.max_qp_wr; 442 } 443 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); 444 445 newxprt->sc_pd = ib_alloc_pd(dev, 0); 446 if (IS_ERR(newxprt->sc_pd)) { 447 dprintk("svcrdma: error creating PD for connect request\n"); 448 goto errout; 449 } 450 newxprt->sc_sq_cq = ib_alloc_cq_any(dev, newxprt, newxprt->sc_sq_depth, 451 IB_POLL_WORKQUEUE); 452 if (IS_ERR(newxprt->sc_sq_cq)) { 453 dprintk("svcrdma: error creating SQ CQ for connect request\n"); 454 goto errout; 455 } 456 newxprt->sc_rq_cq = 457 ib_alloc_cq_any(dev, newxprt, rq_depth, IB_POLL_WORKQUEUE); 458 if (IS_ERR(newxprt->sc_rq_cq)) { 459 dprintk("svcrdma: error creating RQ CQ for connect request\n"); 460 goto errout; 461 } 462 463 memset(&qp_attr, 0, sizeof qp_attr); 464 qp_attr.event_handler = qp_event_handler; 465 qp_attr.qp_context = &newxprt->sc_xprt; 466 qp_attr.port_num = newxprt->sc_port_num; 467 qp_attr.cap.max_rdma_ctxs = ctxts; 468 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; 469 qp_attr.cap.max_recv_wr = rq_depth; 470 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; 471 qp_attr.cap.max_recv_sge = 1; 472 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 473 qp_attr.qp_type = IB_QPT_RC; 474 qp_attr.send_cq = newxprt->sc_sq_cq; 475 qp_attr.recv_cq = newxprt->sc_rq_cq; 476 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", 477 newxprt->sc_cm_id, newxprt->sc_pd); 478 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", 479 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); 480 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", 481 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); 482 483 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); 484 if (ret) { 485 dprintk("svcrdma: failed to create QP, ret=%d\n", ret); 486 goto errout; 487 } 488 newxprt->sc_qp = newxprt->sc_cm_id->qp; 489 490 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) 491 newxprt->sc_snd_w_inv = false; 492 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && 493 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) 494 goto errout; 495 496 if (!svc_rdma_post_recvs(newxprt)) 497 goto errout; 498 499 /* Swap out the handler */ 500 newxprt->sc_cm_id->event_handler = rdma_cma_handler; 501 502 /* Construct RDMA-CM private message */ 503 pmsg.cp_magic = rpcrdma_cmp_magic; 504 pmsg.cp_version = RPCRDMA_CMP_VERSION; 505 pmsg.cp_flags = 0; 506 pmsg.cp_send_size = pmsg.cp_recv_size = 507 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); 508 509 /* Accept Connection */ 510 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); 511 memset(&conn_param, 0, sizeof conn_param); 512 conn_param.responder_resources = 0; 513 conn_param.initiator_depth = min_t(int, newxprt->sc_ord, 514 dev->attrs.max_qp_init_rd_atom); 515 if (!conn_param.initiator_depth) { 516 dprintk("svcrdma: invalid ORD setting\n"); 517 ret = -EINVAL; 518 goto errout; 519 } 520 conn_param.private_data = &pmsg; 521 conn_param.private_data_len = sizeof(pmsg); 522 ret = rdma_accept(newxprt->sc_cm_id, &conn_param); 523 if (ret) 524 goto errout; 525 526 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 527 dprintk("svcrdma: new connection %p accepted:\n", newxprt); 528 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 529 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); 530 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 531 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); 532 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); 533 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); 534 dprintk(" rdma_rw_ctxs : %d\n", ctxts); 535 dprintk(" max_requests : %d\n", newxprt->sc_max_requests); 536 dprintk(" ord : %d\n", conn_param.initiator_depth); 537 #endif 538 539 trace_svcrdma_xprt_accept(&newxprt->sc_xprt); 540 return &newxprt->sc_xprt; 541 542 errout: 543 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); 544 trace_svcrdma_xprt_fail(&newxprt->sc_xprt); 545 /* Take a reference in case the DTO handler runs */ 546 svc_xprt_get(&newxprt->sc_xprt); 547 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) 548 ib_destroy_qp(newxprt->sc_qp); 549 rdma_destroy_id(newxprt->sc_cm_id); 550 /* This call to put will destroy the transport */ 551 svc_xprt_put(&newxprt->sc_xprt); 552 return NULL; 553 } 554 555 static void svc_rdma_release_rqst(struct svc_rqst *rqstp) 556 { 557 } 558 559 /* 560 * When connected, an svc_xprt has at least two references: 561 * 562 * - A reference held by the cm_id between the ESTABLISHED and 563 * DISCONNECTED events. If the remote peer disconnected first, this 564 * reference could be gone. 565 * 566 * - A reference held by the svc_recv code that called this function 567 * as part of close processing. 568 * 569 * At a minimum one references should still be held. 570 */ 571 static void svc_rdma_detach(struct svc_xprt *xprt) 572 { 573 struct svcxprt_rdma *rdma = 574 container_of(xprt, struct svcxprt_rdma, sc_xprt); 575 576 /* Disconnect and flush posted WQE */ 577 rdma_disconnect(rdma->sc_cm_id); 578 } 579 580 static void __svc_rdma_free(struct work_struct *work) 581 { 582 struct svcxprt_rdma *rdma = 583 container_of(work, struct svcxprt_rdma, sc_work); 584 struct svc_xprt *xprt = &rdma->sc_xprt; 585 586 trace_svcrdma_xprt_free(xprt); 587 588 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 589 ib_drain_qp(rdma->sc_qp); 590 591 svc_rdma_flush_recv_queues(rdma); 592 593 /* Final put of backchannel client transport */ 594 if (xprt->xpt_bc_xprt) { 595 xprt_put(xprt->xpt_bc_xprt); 596 xprt->xpt_bc_xprt = NULL; 597 } 598 599 svc_rdma_destroy_rw_ctxts(rdma); 600 svc_rdma_send_ctxts_destroy(rdma); 601 svc_rdma_recv_ctxts_destroy(rdma); 602 603 /* Destroy the QP if present (not a listener) */ 604 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 605 ib_destroy_qp(rdma->sc_qp); 606 607 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) 608 ib_free_cq(rdma->sc_sq_cq); 609 610 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) 611 ib_free_cq(rdma->sc_rq_cq); 612 613 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) 614 ib_dealloc_pd(rdma->sc_pd); 615 616 /* Destroy the CM ID */ 617 rdma_destroy_id(rdma->sc_cm_id); 618 619 kfree(rdma); 620 } 621 622 static void svc_rdma_free(struct svc_xprt *xprt) 623 { 624 struct svcxprt_rdma *rdma = 625 container_of(xprt, struct svcxprt_rdma, sc_xprt); 626 627 INIT_WORK(&rdma->sc_work, __svc_rdma_free); 628 schedule_work(&rdma->sc_work); 629 } 630 631 static int svc_rdma_has_wspace(struct svc_xprt *xprt) 632 { 633 struct svcxprt_rdma *rdma = 634 container_of(xprt, struct svcxprt_rdma, sc_xprt); 635 636 /* 637 * If there are already waiters on the SQ, 638 * return false. 639 */ 640 if (waitqueue_active(&rdma->sc_send_wait)) 641 return 0; 642 643 /* Otherwise return true. */ 644 return 1; 645 } 646 647 static void svc_rdma_secure_port(struct svc_rqst *rqstp) 648 { 649 set_bit(RQ_SECURE, &rqstp->rq_flags); 650 } 651 652 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) 653 { 654 } 655