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_release_rqst = svc_rdma_release_rqst, 86 .xpo_detach = svc_rdma_detach, 87 .xpo_free = svc_rdma_free, 88 .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, 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 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 104 static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *, 105 struct sockaddr *, int, int); 106 static void svc_rdma_bc_detach(struct svc_xprt *); 107 static void svc_rdma_bc_free(struct svc_xprt *); 108 109 static const struct svc_xprt_ops svc_rdma_bc_ops = { 110 .xpo_create = svc_rdma_bc_create, 111 .xpo_detach = svc_rdma_bc_detach, 112 .xpo_free = svc_rdma_bc_free, 113 .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, 114 .xpo_secure_port = svc_rdma_secure_port, 115 }; 116 117 struct svc_xprt_class svc_rdma_bc_class = { 118 .xcl_name = "rdma-bc", 119 .xcl_owner = THIS_MODULE, 120 .xcl_ops = &svc_rdma_bc_ops, 121 .xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN) 122 }; 123 124 static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv, 125 struct net *net, 126 struct sockaddr *sa, int salen, 127 int flags) 128 { 129 struct svcxprt_rdma *cma_xprt; 130 struct svc_xprt *xprt; 131 132 cma_xprt = svc_rdma_create_xprt(serv, net); 133 if (!cma_xprt) 134 return ERR_PTR(-ENOMEM); 135 xprt = &cma_xprt->sc_xprt; 136 137 svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv); 138 set_bit(XPT_CONG_CTRL, &xprt->xpt_flags); 139 serv->sv_bc_xprt = xprt; 140 141 dprintk("svcrdma: %s(%p)\n", __func__, xprt); 142 return xprt; 143 } 144 145 static void svc_rdma_bc_detach(struct svc_xprt *xprt) 146 { 147 dprintk("svcrdma: %s(%p)\n", __func__, xprt); 148 } 149 150 static void svc_rdma_bc_free(struct svc_xprt *xprt) 151 { 152 struct svcxprt_rdma *rdma = 153 container_of(xprt, struct svcxprt_rdma, sc_xprt); 154 155 dprintk("svcrdma: %s(%p)\n", __func__, xprt); 156 if (xprt) 157 kfree(rdma); 158 } 159 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 160 161 /* QP event handler */ 162 static void qp_event_handler(struct ib_event *event, void *context) 163 { 164 struct svc_xprt *xprt = context; 165 166 trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); 167 switch (event->event) { 168 /* These are considered benign events */ 169 case IB_EVENT_PATH_MIG: 170 case IB_EVENT_COMM_EST: 171 case IB_EVENT_SQ_DRAINED: 172 case IB_EVENT_QP_LAST_WQE_REACHED: 173 break; 174 175 /* These are considered fatal events */ 176 case IB_EVENT_PATH_MIG_ERR: 177 case IB_EVENT_QP_FATAL: 178 case IB_EVENT_QP_REQ_ERR: 179 case IB_EVENT_QP_ACCESS_ERR: 180 case IB_EVENT_DEVICE_FATAL: 181 default: 182 set_bit(XPT_CLOSE, &xprt->xpt_flags); 183 svc_xprt_enqueue(xprt); 184 break; 185 } 186 } 187 188 static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, 189 struct net *net) 190 { 191 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); 192 193 if (!cma_xprt) { 194 dprintk("svcrdma: failed to create new transport\n"); 195 return NULL; 196 } 197 svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); 198 INIT_LIST_HEAD(&cma_xprt->sc_accept_q); 199 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); 200 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); 201 INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts); 202 INIT_LIST_HEAD(&cma_xprt->sc_recv_ctxts); 203 INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); 204 init_waitqueue_head(&cma_xprt->sc_send_wait); 205 206 spin_lock_init(&cma_xprt->sc_lock); 207 spin_lock_init(&cma_xprt->sc_rq_dto_lock); 208 spin_lock_init(&cma_xprt->sc_send_lock); 209 spin_lock_init(&cma_xprt->sc_recv_lock); 210 spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); 211 212 /* 213 * Note that this implies that the underlying transport support 214 * has some form of congestion control (see RFC 7530 section 3.1 215 * paragraph 2). For now, we assume that all supported RDMA 216 * transports are suitable here. 217 */ 218 set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); 219 220 return cma_xprt; 221 } 222 223 static void 224 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, 225 struct rdma_conn_param *param) 226 { 227 const struct rpcrdma_connect_private *pmsg = param->private_data; 228 229 if (pmsg && 230 pmsg->cp_magic == rpcrdma_cmp_magic && 231 pmsg->cp_version == RPCRDMA_CMP_VERSION) { 232 newxprt->sc_snd_w_inv = pmsg->cp_flags & 233 RPCRDMA_CMP_F_SND_W_INV_OK; 234 235 dprintk("svcrdma: client send_size %u, recv_size %u " 236 "remote inv %ssupported\n", 237 rpcrdma_decode_buffer_size(pmsg->cp_send_size), 238 rpcrdma_decode_buffer_size(pmsg->cp_recv_size), 239 newxprt->sc_snd_w_inv ? "" : "un"); 240 } 241 } 242 243 /* 244 * This function handles the CONNECT_REQUEST event on a listening 245 * endpoint. It is passed the cma_id for the _new_ connection. The context in 246 * this cma_id is inherited from the listening cma_id and is the svc_xprt 247 * structure for the listening endpoint. 248 * 249 * This function creates a new xprt for the new connection and enqueues it on 250 * the accept queue for the listent xprt. When the listen thread is kicked, it 251 * will call the recvfrom method on the listen xprt which will accept the new 252 * connection. 253 */ 254 static void handle_connect_req(struct rdma_cm_id *new_cma_id, 255 struct rdma_conn_param *param) 256 { 257 struct svcxprt_rdma *listen_xprt = new_cma_id->context; 258 struct svcxprt_rdma *newxprt; 259 struct sockaddr *sa; 260 261 /* Create a new transport */ 262 newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 263 listen_xprt->sc_xprt.xpt_net); 264 if (!newxprt) 265 return; 266 newxprt->sc_cm_id = new_cma_id; 267 new_cma_id->context = newxprt; 268 svc_rdma_parse_connect_private(newxprt, param); 269 270 /* Save client advertised inbound read limit for use later in accept. */ 271 newxprt->sc_ord = param->initiator_depth; 272 273 /* Set the local and remote addresses in the transport */ 274 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 275 svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 276 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 277 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); 278 279 /* 280 * Enqueue the new transport on the accept queue of the listening 281 * transport 282 */ 283 spin_lock_bh(&listen_xprt->sc_lock); 284 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); 285 spin_unlock_bh(&listen_xprt->sc_lock); 286 287 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); 288 svc_xprt_enqueue(&listen_xprt->sc_xprt); 289 } 290 291 /* 292 * Handles events generated on the listening endpoint. These events will be 293 * either be incoming connect requests or adapter removal events. 294 */ 295 static int rdma_listen_handler(struct rdma_cm_id *cma_id, 296 struct rdma_cm_event *event) 297 { 298 struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.src_addr; 299 int ret = 0; 300 301 trace_svcrdma_cm_event(event, sap); 302 303 switch (event->event) { 304 case RDMA_CM_EVENT_CONNECT_REQUEST: 305 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " 306 "event = %s (%d)\n", cma_id, cma_id->context, 307 rdma_event_msg(event->event), event->event); 308 handle_connect_req(cma_id, &event->param.conn); 309 break; 310 default: 311 /* NB: No device removal upcall for INADDR_ANY listeners */ 312 dprintk("svcrdma: Unexpected event on listening endpoint %p, " 313 "event = %s (%d)\n", cma_id, 314 rdma_event_msg(event->event), event->event); 315 break; 316 } 317 318 return ret; 319 } 320 321 static int rdma_cma_handler(struct rdma_cm_id *cma_id, 322 struct rdma_cm_event *event) 323 { 324 struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.dst_addr; 325 struct svcxprt_rdma *rdma = cma_id->context; 326 struct svc_xprt *xprt = &rdma->sc_xprt; 327 328 trace_svcrdma_cm_event(event, sap); 329 330 switch (event->event) { 331 case RDMA_CM_EVENT_ESTABLISHED: 332 /* Accept complete */ 333 svc_xprt_get(xprt); 334 dprintk("svcrdma: Connection completed on DTO xprt=%p, " 335 "cm_id=%p\n", xprt, cma_id); 336 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); 337 svc_xprt_enqueue(xprt); 338 break; 339 case RDMA_CM_EVENT_DISCONNECTED: 340 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", 341 xprt, cma_id); 342 set_bit(XPT_CLOSE, &xprt->xpt_flags); 343 svc_xprt_enqueue(xprt); 344 svc_xprt_put(xprt); 345 break; 346 case RDMA_CM_EVENT_DEVICE_REMOVAL: 347 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " 348 "event = %s (%d)\n", cma_id, xprt, 349 rdma_event_msg(event->event), event->event); 350 set_bit(XPT_CLOSE, &xprt->xpt_flags); 351 svc_xprt_enqueue(xprt); 352 svc_xprt_put(xprt); 353 break; 354 default: 355 dprintk("svcrdma: Unexpected event on DTO endpoint %p, " 356 "event = %s (%d)\n", cma_id, 357 rdma_event_msg(event->event), event->event); 358 break; 359 } 360 return 0; 361 } 362 363 /* 364 * Create a listening RDMA service endpoint. 365 */ 366 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, 367 struct net *net, 368 struct sockaddr *sa, int salen, 369 int flags) 370 { 371 struct rdma_cm_id *listen_id; 372 struct svcxprt_rdma *cma_xprt; 373 int ret; 374 375 dprintk("svcrdma: Creating RDMA listener\n"); 376 if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { 377 dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); 378 return ERR_PTR(-EAFNOSUPPORT); 379 } 380 cma_xprt = svc_rdma_create_xprt(serv, net); 381 if (!cma_xprt) 382 return ERR_PTR(-ENOMEM); 383 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); 384 strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); 385 386 listen_id = rdma_create_id(net, rdma_listen_handler, cma_xprt, 387 RDMA_PS_TCP, IB_QPT_RC); 388 if (IS_ERR(listen_id)) { 389 ret = PTR_ERR(listen_id); 390 dprintk("svcrdma: rdma_create_id failed = %d\n", ret); 391 goto err0; 392 } 393 394 /* Allow both IPv4 and IPv6 sockets to bind a single port 395 * at the same time. 396 */ 397 #if IS_ENABLED(CONFIG_IPV6) 398 ret = rdma_set_afonly(listen_id, 1); 399 if (ret) { 400 dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret); 401 goto err1; 402 } 403 #endif 404 ret = rdma_bind_addr(listen_id, sa); 405 if (ret) { 406 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); 407 goto err1; 408 } 409 cma_xprt->sc_cm_id = listen_id; 410 411 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); 412 if (ret) { 413 dprintk("svcrdma: rdma_listen failed = %d\n", ret); 414 goto err1; 415 } 416 417 /* 418 * We need to use the address from the cm_id in case the 419 * caller specified 0 for the port number. 420 */ 421 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; 422 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); 423 424 return &cma_xprt->sc_xprt; 425 426 err1: 427 rdma_destroy_id(listen_id); 428 err0: 429 kfree(cma_xprt); 430 return ERR_PTR(ret); 431 } 432 433 /* 434 * This is the xpo_recvfrom function for listening endpoints. Its 435 * purpose is to accept incoming connections. The CMA callback handler 436 * has already created a new transport and attached it to the new CMA 437 * ID. 438 * 439 * There is a queue of pending connections hung on the listening 440 * transport. This queue contains the new svc_xprt structure. This 441 * function takes svc_xprt structures off the accept_q and completes 442 * the connection. 443 */ 444 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) 445 { 446 struct svcxprt_rdma *listen_rdma; 447 struct svcxprt_rdma *newxprt = NULL; 448 struct rdma_conn_param conn_param; 449 struct rpcrdma_connect_private pmsg; 450 struct ib_qp_init_attr qp_attr; 451 unsigned int ctxts, rq_depth; 452 struct ib_device *dev; 453 struct sockaddr *sap; 454 int ret = 0; 455 456 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); 457 clear_bit(XPT_CONN, &xprt->xpt_flags); 458 /* Get the next entry off the accept list */ 459 spin_lock_bh(&listen_rdma->sc_lock); 460 if (!list_empty(&listen_rdma->sc_accept_q)) { 461 newxprt = list_entry(listen_rdma->sc_accept_q.next, 462 struct svcxprt_rdma, sc_accept_q); 463 list_del_init(&newxprt->sc_accept_q); 464 } 465 if (!list_empty(&listen_rdma->sc_accept_q)) 466 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); 467 spin_unlock_bh(&listen_rdma->sc_lock); 468 if (!newxprt) 469 return NULL; 470 471 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", 472 newxprt, newxprt->sc_cm_id); 473 474 dev = newxprt->sc_cm_id->device; 475 newxprt->sc_port_num = newxprt->sc_cm_id->port_num; 476 477 /* Qualify the transport resource defaults with the 478 * capabilities of this particular device */ 479 newxprt->sc_max_send_sges = dev->attrs.max_sge; 480 /* transport hdr, head iovec, one page list entry, tail iovec */ 481 if (newxprt->sc_max_send_sges < 4) { 482 pr_err("svcrdma: too few Send SGEs available (%d)\n", 483 newxprt->sc_max_send_sges); 484 goto errout; 485 } 486 newxprt->sc_max_req_size = svcrdma_max_req_size; 487 newxprt->sc_max_requests = svcrdma_max_requests; 488 newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; 489 rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; 490 if (rq_depth > dev->attrs.max_qp_wr) { 491 pr_warn("svcrdma: reducing receive depth to %d\n", 492 dev->attrs.max_qp_wr); 493 rq_depth = dev->attrs.max_qp_wr; 494 newxprt->sc_max_requests = rq_depth - 2; 495 newxprt->sc_max_bc_requests = 2; 496 } 497 newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); 498 ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); 499 ctxts *= newxprt->sc_max_requests; 500 newxprt->sc_sq_depth = rq_depth + ctxts; 501 if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { 502 pr_warn("svcrdma: reducing send depth to %d\n", 503 dev->attrs.max_qp_wr); 504 newxprt->sc_sq_depth = dev->attrs.max_qp_wr; 505 } 506 atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); 507 508 newxprt->sc_pd = ib_alloc_pd(dev, 0); 509 if (IS_ERR(newxprt->sc_pd)) { 510 dprintk("svcrdma: error creating PD for connect request\n"); 511 goto errout; 512 } 513 newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth, 514 0, IB_POLL_WORKQUEUE); 515 if (IS_ERR(newxprt->sc_sq_cq)) { 516 dprintk("svcrdma: error creating SQ CQ for connect request\n"); 517 goto errout; 518 } 519 newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, rq_depth, 520 0, IB_POLL_WORKQUEUE); 521 if (IS_ERR(newxprt->sc_rq_cq)) { 522 dprintk("svcrdma: error creating RQ CQ for connect request\n"); 523 goto errout; 524 } 525 526 memset(&qp_attr, 0, sizeof qp_attr); 527 qp_attr.event_handler = qp_event_handler; 528 qp_attr.qp_context = &newxprt->sc_xprt; 529 qp_attr.port_num = newxprt->sc_port_num; 530 qp_attr.cap.max_rdma_ctxs = ctxts; 531 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; 532 qp_attr.cap.max_recv_wr = rq_depth; 533 qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; 534 qp_attr.cap.max_recv_sge = 1; 535 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 536 qp_attr.qp_type = IB_QPT_RC; 537 qp_attr.send_cq = newxprt->sc_sq_cq; 538 qp_attr.recv_cq = newxprt->sc_rq_cq; 539 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n", 540 newxprt->sc_cm_id, newxprt->sc_pd); 541 dprintk(" cap.max_send_wr = %d, cap.max_recv_wr = %d\n", 542 qp_attr.cap.max_send_wr, qp_attr.cap.max_recv_wr); 543 dprintk(" cap.max_send_sge = %d, cap.max_recv_sge = %d\n", 544 qp_attr.cap.max_send_sge, qp_attr.cap.max_recv_sge); 545 546 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); 547 if (ret) { 548 dprintk("svcrdma: failed to create QP, ret=%d\n", ret); 549 goto errout; 550 } 551 newxprt->sc_qp = newxprt->sc_cm_id->qp; 552 553 if (!(dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) 554 newxprt->sc_snd_w_inv = false; 555 if (!rdma_protocol_iwarp(dev, newxprt->sc_port_num) && 556 !rdma_ib_or_roce(dev, newxprt->sc_port_num)) 557 goto errout; 558 559 if (!svc_rdma_post_recvs(newxprt)) 560 goto errout; 561 562 /* Swap out the handler */ 563 newxprt->sc_cm_id->event_handler = rdma_cma_handler; 564 565 /* Construct RDMA-CM private message */ 566 pmsg.cp_magic = rpcrdma_cmp_magic; 567 pmsg.cp_version = RPCRDMA_CMP_VERSION; 568 pmsg.cp_flags = 0; 569 pmsg.cp_send_size = pmsg.cp_recv_size = 570 rpcrdma_encode_buffer_size(newxprt->sc_max_req_size); 571 572 /* Accept Connection */ 573 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); 574 memset(&conn_param, 0, sizeof conn_param); 575 conn_param.responder_resources = 0; 576 conn_param.initiator_depth = min_t(int, newxprt->sc_ord, 577 dev->attrs.max_qp_init_rd_atom); 578 if (!conn_param.initiator_depth) { 579 dprintk("svcrdma: invalid ORD setting\n"); 580 ret = -EINVAL; 581 goto errout; 582 } 583 conn_param.private_data = &pmsg; 584 conn_param.private_data_len = sizeof(pmsg); 585 ret = rdma_accept(newxprt->sc_cm_id, &conn_param); 586 if (ret) 587 goto errout; 588 589 dprintk("svcrdma: new connection %p accepted:\n", newxprt); 590 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; 591 dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); 592 sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; 593 dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); 594 dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); 595 dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); 596 dprintk(" rdma_rw_ctxs : %d\n", ctxts); 597 dprintk(" max_requests : %d\n", newxprt->sc_max_requests); 598 dprintk(" ord : %d\n", conn_param.initiator_depth); 599 600 trace_svcrdma_xprt_accept(&newxprt->sc_xprt); 601 return &newxprt->sc_xprt; 602 603 errout: 604 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); 605 trace_svcrdma_xprt_fail(&newxprt->sc_xprt); 606 /* Take a reference in case the DTO handler runs */ 607 svc_xprt_get(&newxprt->sc_xprt); 608 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) 609 ib_destroy_qp(newxprt->sc_qp); 610 rdma_destroy_id(newxprt->sc_cm_id); 611 /* This call to put will destroy the transport */ 612 svc_xprt_put(&newxprt->sc_xprt); 613 return NULL; 614 } 615 616 static void svc_rdma_release_rqst(struct svc_rqst *rqstp) 617 { 618 } 619 620 /* 621 * When connected, an svc_xprt has at least two references: 622 * 623 * - A reference held by the cm_id between the ESTABLISHED and 624 * DISCONNECTED events. If the remote peer disconnected first, this 625 * reference could be gone. 626 * 627 * - A reference held by the svc_recv code that called this function 628 * as part of close processing. 629 * 630 * At a minimum one references should still be held. 631 */ 632 static void svc_rdma_detach(struct svc_xprt *xprt) 633 { 634 struct svcxprt_rdma *rdma = 635 container_of(xprt, struct svcxprt_rdma, sc_xprt); 636 637 /* Disconnect and flush posted WQE */ 638 rdma_disconnect(rdma->sc_cm_id); 639 } 640 641 static void __svc_rdma_free(struct work_struct *work) 642 { 643 struct svcxprt_rdma *rdma = 644 container_of(work, struct svcxprt_rdma, sc_work); 645 struct svc_xprt *xprt = &rdma->sc_xprt; 646 647 trace_svcrdma_xprt_free(xprt); 648 649 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 650 ib_drain_qp(rdma->sc_qp); 651 652 /* We should only be called from kref_put */ 653 if (kref_read(&xprt->xpt_ref) != 0) 654 pr_err("svcrdma: sc_xprt still in use? (%d)\n", 655 kref_read(&xprt->xpt_ref)); 656 657 svc_rdma_flush_recv_queues(rdma); 658 659 /* Final put of backchannel client transport */ 660 if (xprt->xpt_bc_xprt) { 661 xprt_put(xprt->xpt_bc_xprt); 662 xprt->xpt_bc_xprt = NULL; 663 } 664 665 svc_rdma_destroy_rw_ctxts(rdma); 666 svc_rdma_send_ctxts_destroy(rdma); 667 svc_rdma_recv_ctxts_destroy(rdma); 668 669 /* Destroy the QP if present (not a listener) */ 670 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) 671 ib_destroy_qp(rdma->sc_qp); 672 673 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) 674 ib_free_cq(rdma->sc_sq_cq); 675 676 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) 677 ib_free_cq(rdma->sc_rq_cq); 678 679 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) 680 ib_dealloc_pd(rdma->sc_pd); 681 682 /* Destroy the CM ID */ 683 rdma_destroy_id(rdma->sc_cm_id); 684 685 kfree(rdma); 686 } 687 688 static void svc_rdma_free(struct svc_xprt *xprt) 689 { 690 struct svcxprt_rdma *rdma = 691 container_of(xprt, struct svcxprt_rdma, sc_xprt); 692 INIT_WORK(&rdma->sc_work, __svc_rdma_free); 693 queue_work(svc_rdma_wq, &rdma->sc_work); 694 } 695 696 static int svc_rdma_has_wspace(struct svc_xprt *xprt) 697 { 698 struct svcxprt_rdma *rdma = 699 container_of(xprt, struct svcxprt_rdma, sc_xprt); 700 701 /* 702 * If there are already waiters on the SQ, 703 * return false. 704 */ 705 if (waitqueue_active(&rdma->sc_send_wait)) 706 return 0; 707 708 /* Otherwise return true. */ 709 return 1; 710 } 711 712 static void svc_rdma_secure_port(struct svc_rqst *rqstp) 713 { 714 set_bit(RQ_SECURE, &rqstp->rq_flags); 715 } 716 717 static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) 718 { 719 } 720