1 /* 2 * Copyright (c) 2006 Oracle. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33 #include <linux/kernel.h> 34 #include <linux/in.h> 35 #include <linux/slab.h> 36 #include <linux/vmalloc.h> 37 #include <linux/ratelimit.h> 38 39 #include "rds_single_path.h" 40 #include "rds.h" 41 #include "ib.h" 42 43 /* 44 * Set the selected protocol version 45 */ 46 static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) 47 { 48 conn->c_version = version; 49 } 50 51 /* 52 * Set up flow control 53 */ 54 static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) 55 { 56 struct rds_ib_connection *ic = conn->c_transport_data; 57 58 if (rds_ib_sysctl_flow_control && credits != 0) { 59 /* We're doing flow control */ 60 ic->i_flowctl = 1; 61 rds_ib_send_add_credits(conn, credits); 62 } else { 63 ic->i_flowctl = 0; 64 } 65 } 66 67 /* 68 * Tune RNR behavior. Without flow control, we use a rather 69 * low timeout, but not the absolute minimum - this should 70 * be tunable. 71 * 72 * We already set the RNR retry count to 7 (which is the 73 * smallest infinite number :-) above. 74 * If flow control is off, we want to change this back to 0 75 * so that we learn quickly when our credit accounting is 76 * buggy. 77 * 78 * Caller passes in a qp_attr pointer - don't waste stack spacv 79 * by allocation this twice. 80 */ 81 static void 82 rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) 83 { 84 int ret; 85 86 attr->min_rnr_timer = IB_RNR_TIMER_000_32; 87 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); 88 if (ret) 89 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); 90 } 91 92 /* 93 * Connection established. 94 * We get here for both outgoing and incoming connection. 95 */ 96 void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) 97 { 98 const struct rds_ib_connect_private *dp = NULL; 99 struct rds_ib_connection *ic = conn->c_transport_data; 100 struct ib_qp_attr qp_attr; 101 int err; 102 103 if (event->param.conn.private_data_len >= sizeof(*dp)) { 104 dp = event->param.conn.private_data; 105 106 /* make sure it isn't empty data */ 107 if (dp->dp_protocol_major) { 108 rds_ib_set_protocol(conn, 109 RDS_PROTOCOL(dp->dp_protocol_major, 110 dp->dp_protocol_minor)); 111 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 112 } 113 } 114 115 if (conn->c_version < RDS_PROTOCOL(3, 1)) { 116 pr_notice("RDS/IB: Connection <%pI4,%pI4> version %u.%u no longer supported\n", 117 &conn->c_laddr, &conn->c_faddr, 118 RDS_PROTOCOL_MAJOR(conn->c_version), 119 RDS_PROTOCOL_MINOR(conn->c_version)); 120 set_bit(RDS_DESTROY_PENDING, &conn->c_path[0].cp_flags); 121 rds_conn_destroy(conn); 122 return; 123 } else { 124 pr_notice("RDS/IB: %s conn connected <%pI4,%pI4> version %u.%u%s\n", 125 ic->i_active_side ? "Active" : "Passive", 126 &conn->c_laddr, &conn->c_faddr, 127 RDS_PROTOCOL_MAJOR(conn->c_version), 128 RDS_PROTOCOL_MINOR(conn->c_version), 129 ic->i_flowctl ? ", flow control" : ""); 130 } 131 132 atomic_set(&ic->i_cq_quiesce, 0); 133 134 /* Init rings and fill recv. this needs to wait until protocol 135 * negotiation is complete, since ring layout is different 136 * from 3.1 to 4.1. 137 */ 138 rds_ib_send_init_ring(ic); 139 rds_ib_recv_init_ring(ic); 140 /* Post receive buffers - as a side effect, this will update 141 * the posted credit count. */ 142 rds_ib_recv_refill(conn, 1, GFP_KERNEL); 143 144 /* Tune RNR behavior */ 145 rds_ib_tune_rnr(ic, &qp_attr); 146 147 qp_attr.qp_state = IB_QPS_RTS; 148 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); 149 if (err) 150 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); 151 152 /* update ib_device with this local ipaddr */ 153 err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr); 154 if (err) 155 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", 156 err); 157 158 /* If the peer gave us the last packet it saw, process this as if 159 * we had received a regular ACK. */ 160 if (dp) { 161 /* dp structure start is not guaranteed to be 8 bytes aligned. 162 * Since dp_ack_seq is 64-bit extended load operations can be 163 * used so go through get_unaligned to avoid unaligned errors. 164 */ 165 __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq); 166 167 if (dp_ack_seq) 168 rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq), 169 NULL); 170 } 171 172 rds_connect_complete(conn); 173 } 174 175 static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, 176 struct rdma_conn_param *conn_param, 177 struct rds_ib_connect_private *dp, 178 u32 protocol_version, 179 u32 max_responder_resources, 180 u32 max_initiator_depth) 181 { 182 struct rds_ib_connection *ic = conn->c_transport_data; 183 struct rds_ib_device *rds_ibdev = ic->rds_ibdev; 184 185 memset(conn_param, 0, sizeof(struct rdma_conn_param)); 186 187 conn_param->responder_resources = 188 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources); 189 conn_param->initiator_depth = 190 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth); 191 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); 192 conn_param->rnr_retry_count = 7; 193 194 if (dp) { 195 memset(dp, 0, sizeof(*dp)); 196 dp->dp_saddr = conn->c_laddr; 197 dp->dp_daddr = conn->c_faddr; 198 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); 199 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); 200 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); 201 dp->dp_ack_seq = cpu_to_be64(rds_ib_piggyb_ack(ic)); 202 203 /* Advertise flow control */ 204 if (ic->i_flowctl) { 205 unsigned int credits; 206 207 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); 208 dp->dp_credit = cpu_to_be32(credits); 209 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); 210 } 211 212 conn_param->private_data = dp; 213 conn_param->private_data_len = sizeof(*dp); 214 } 215 } 216 217 static void rds_ib_cq_event_handler(struct ib_event *event, void *data) 218 { 219 rdsdebug("event %u (%s) data %p\n", 220 event->event, ib_event_msg(event->event), data); 221 } 222 223 /* Plucking the oldest entry from the ring can be done concurrently with 224 * the thread refilling the ring. Each ring operation is protected by 225 * spinlocks and the transient state of refilling doesn't change the 226 * recording of which entry is oldest. 227 * 228 * This relies on IB only calling one cq comp_handler for each cq so that 229 * there will only be one caller of rds_recv_incoming() per RDS connection. 230 */ 231 static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context) 232 { 233 struct rds_connection *conn = context; 234 struct rds_ib_connection *ic = conn->c_transport_data; 235 236 rdsdebug("conn %p cq %p\n", conn, cq); 237 238 rds_ib_stats_inc(s_ib_evt_handler_call); 239 240 tasklet_schedule(&ic->i_recv_tasklet); 241 } 242 243 static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq, 244 struct ib_wc *wcs) 245 { 246 int nr, i; 247 struct ib_wc *wc; 248 249 while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { 250 for (i = 0; i < nr; i++) { 251 wc = wcs + i; 252 rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", 253 (unsigned long long)wc->wr_id, wc->status, 254 wc->byte_len, be32_to_cpu(wc->ex.imm_data)); 255 256 if (wc->wr_id <= ic->i_send_ring.w_nr || 257 wc->wr_id == RDS_IB_ACK_WR_ID) 258 rds_ib_send_cqe_handler(ic, wc); 259 else 260 rds_ib_mr_cqe_handler(ic, wc); 261 262 } 263 } 264 } 265 266 static void rds_ib_tasklet_fn_send(unsigned long data) 267 { 268 struct rds_ib_connection *ic = (struct rds_ib_connection *)data; 269 struct rds_connection *conn = ic->conn; 270 271 rds_ib_stats_inc(s_ib_tasklet_call); 272 273 /* if cq has been already reaped, ignore incoming cq event */ 274 if (atomic_read(&ic->i_cq_quiesce)) 275 return; 276 277 poll_scq(ic, ic->i_send_cq, ic->i_send_wc); 278 ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); 279 poll_scq(ic, ic->i_send_cq, ic->i_send_wc); 280 281 if (rds_conn_up(conn) && 282 (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) || 283 test_bit(0, &conn->c_map_queued))) 284 rds_send_xmit(&ic->conn->c_path[0]); 285 } 286 287 static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq, 288 struct ib_wc *wcs, 289 struct rds_ib_ack_state *ack_state) 290 { 291 int nr, i; 292 struct ib_wc *wc; 293 294 while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) { 295 for (i = 0; i < nr; i++) { 296 wc = wcs + i; 297 rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", 298 (unsigned long long)wc->wr_id, wc->status, 299 wc->byte_len, be32_to_cpu(wc->ex.imm_data)); 300 301 rds_ib_recv_cqe_handler(ic, wc, ack_state); 302 } 303 } 304 } 305 306 static void rds_ib_tasklet_fn_recv(unsigned long data) 307 { 308 struct rds_ib_connection *ic = (struct rds_ib_connection *)data; 309 struct rds_connection *conn = ic->conn; 310 struct rds_ib_device *rds_ibdev = ic->rds_ibdev; 311 struct rds_ib_ack_state state; 312 313 if (!rds_ibdev) 314 rds_conn_drop(conn); 315 316 rds_ib_stats_inc(s_ib_tasklet_call); 317 318 /* if cq has been already reaped, ignore incoming cq event */ 319 if (atomic_read(&ic->i_cq_quiesce)) 320 return; 321 322 memset(&state, 0, sizeof(state)); 323 poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); 324 ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); 325 poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state); 326 327 if (state.ack_next_valid) 328 rds_ib_set_ack(ic, state.ack_next, state.ack_required); 329 if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) { 330 rds_send_drop_acked(conn, state.ack_recv, NULL); 331 ic->i_ack_recv = state.ack_recv; 332 } 333 334 if (rds_conn_up(conn)) 335 rds_ib_attempt_ack(ic); 336 } 337 338 static void rds_ib_qp_event_handler(struct ib_event *event, void *data) 339 { 340 struct rds_connection *conn = data; 341 struct rds_ib_connection *ic = conn->c_transport_data; 342 343 rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event, 344 ib_event_msg(event->event)); 345 346 switch (event->event) { 347 case IB_EVENT_COMM_EST: 348 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); 349 break; 350 default: 351 rdsdebug("Fatal QP Event %u (%s) " 352 "- connection %pI4->%pI4, reconnecting\n", 353 event->event, ib_event_msg(event->event), 354 &conn->c_laddr, &conn->c_faddr); 355 rds_conn_drop(conn); 356 break; 357 } 358 } 359 360 static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context) 361 { 362 struct rds_connection *conn = context; 363 struct rds_ib_connection *ic = conn->c_transport_data; 364 365 rdsdebug("conn %p cq %p\n", conn, cq); 366 367 rds_ib_stats_inc(s_ib_evt_handler_call); 368 369 tasklet_schedule(&ic->i_send_tasklet); 370 } 371 372 static inline int ibdev_get_unused_vector(struct rds_ib_device *rds_ibdev) 373 { 374 int min = rds_ibdev->vector_load[rds_ibdev->dev->num_comp_vectors - 1]; 375 int index = rds_ibdev->dev->num_comp_vectors - 1; 376 int i; 377 378 for (i = rds_ibdev->dev->num_comp_vectors - 1; i >= 0; i--) { 379 if (rds_ibdev->vector_load[i] < min) { 380 index = i; 381 min = rds_ibdev->vector_load[i]; 382 } 383 } 384 385 rds_ibdev->vector_load[index]++; 386 return index; 387 } 388 389 static inline void ibdev_put_vector(struct rds_ib_device *rds_ibdev, int index) 390 { 391 rds_ibdev->vector_load[index]--; 392 } 393 394 /* 395 * This needs to be very careful to not leave IS_ERR pointers around for 396 * cleanup to trip over. 397 */ 398 static int rds_ib_setup_qp(struct rds_connection *conn) 399 { 400 struct rds_ib_connection *ic = conn->c_transport_data; 401 struct ib_device *dev = ic->i_cm_id->device; 402 struct ib_qp_init_attr attr; 403 struct ib_cq_init_attr cq_attr = {}; 404 struct rds_ib_device *rds_ibdev; 405 int ret, fr_queue_space; 406 407 /* 408 * It's normal to see a null device if an incoming connection races 409 * with device removal, so we don't print a warning. 410 */ 411 rds_ibdev = rds_ib_get_client_data(dev); 412 if (!rds_ibdev) 413 return -EOPNOTSUPP; 414 415 /* The fr_queue_space is currently set to 512, to add extra space on 416 * completion queue and send queue. This extra space is used for FRMR 417 * registration and invalidation work requests 418 */ 419 fr_queue_space = rds_ibdev->use_fastreg ? 420 (RDS_IB_DEFAULT_FR_WR + 1) + 421 (RDS_IB_DEFAULT_FR_INV_WR + 1) 422 : 0; 423 424 /* add the conn now so that connection establishment has the dev */ 425 rds_ib_add_conn(rds_ibdev, conn); 426 427 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) 428 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); 429 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) 430 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); 431 432 /* Protection domain and memory range */ 433 ic->i_pd = rds_ibdev->pd; 434 435 ic->i_scq_vector = ibdev_get_unused_vector(rds_ibdev); 436 cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1; 437 cq_attr.comp_vector = ic->i_scq_vector; 438 ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send, 439 rds_ib_cq_event_handler, conn, 440 &cq_attr); 441 if (IS_ERR(ic->i_send_cq)) { 442 ret = PTR_ERR(ic->i_send_cq); 443 ic->i_send_cq = NULL; 444 ibdev_put_vector(rds_ibdev, ic->i_scq_vector); 445 rdsdebug("ib_create_cq send failed: %d\n", ret); 446 goto rds_ibdev_out; 447 } 448 449 ic->i_rcq_vector = ibdev_get_unused_vector(rds_ibdev); 450 cq_attr.cqe = ic->i_recv_ring.w_nr; 451 cq_attr.comp_vector = ic->i_rcq_vector; 452 ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv, 453 rds_ib_cq_event_handler, conn, 454 &cq_attr); 455 if (IS_ERR(ic->i_recv_cq)) { 456 ret = PTR_ERR(ic->i_recv_cq); 457 ic->i_recv_cq = NULL; 458 ibdev_put_vector(rds_ibdev, ic->i_rcq_vector); 459 rdsdebug("ib_create_cq recv failed: %d\n", ret); 460 goto send_cq_out; 461 } 462 463 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); 464 if (ret) { 465 rdsdebug("ib_req_notify_cq send failed: %d\n", ret); 466 goto recv_cq_out; 467 } 468 469 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); 470 if (ret) { 471 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); 472 goto recv_cq_out; 473 } 474 475 /* XXX negotiate max send/recv with remote? */ 476 memset(&attr, 0, sizeof(attr)); 477 attr.event_handler = rds_ib_qp_event_handler; 478 attr.qp_context = conn; 479 /* + 1 to allow for the single ack message */ 480 attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1; 481 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; 482 attr.cap.max_send_sge = rds_ibdev->max_sge; 483 attr.cap.max_recv_sge = RDS_IB_RECV_SGE; 484 attr.sq_sig_type = IB_SIGNAL_REQ_WR; 485 attr.qp_type = IB_QPT_RC; 486 attr.send_cq = ic->i_send_cq; 487 attr.recv_cq = ic->i_recv_cq; 488 atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR); 489 atomic_set(&ic->i_fastunreg_wrs, RDS_IB_DEFAULT_FR_INV_WR); 490 491 /* 492 * XXX this can fail if max_*_wr is too large? Are we supposed 493 * to back off until we get a value that the hardware can support? 494 */ 495 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); 496 if (ret) { 497 rdsdebug("rdma_create_qp failed: %d\n", ret); 498 goto recv_cq_out; 499 } 500 501 ic->i_send_hdrs = ib_dma_alloc_coherent(dev, 502 ic->i_send_ring.w_nr * 503 sizeof(struct rds_header), 504 &ic->i_send_hdrs_dma, GFP_KERNEL); 505 if (!ic->i_send_hdrs) { 506 ret = -ENOMEM; 507 rdsdebug("ib_dma_alloc_coherent send failed\n"); 508 goto qp_out; 509 } 510 511 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, 512 ic->i_recv_ring.w_nr * 513 sizeof(struct rds_header), 514 &ic->i_recv_hdrs_dma, GFP_KERNEL); 515 if (!ic->i_recv_hdrs) { 516 ret = -ENOMEM; 517 rdsdebug("ib_dma_alloc_coherent recv failed\n"); 518 goto send_hdrs_dma_out; 519 } 520 521 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), 522 &ic->i_ack_dma, GFP_KERNEL); 523 if (!ic->i_ack) { 524 ret = -ENOMEM; 525 rdsdebug("ib_dma_alloc_coherent ack failed\n"); 526 goto recv_hdrs_dma_out; 527 } 528 529 ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work), 530 ibdev_to_node(dev)); 531 if (!ic->i_sends) { 532 ret = -ENOMEM; 533 rdsdebug("send allocation failed\n"); 534 goto ack_dma_out; 535 } 536 537 ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work), 538 ibdev_to_node(dev)); 539 if (!ic->i_recvs) { 540 ret = -ENOMEM; 541 rdsdebug("recv allocation failed\n"); 542 goto sends_out; 543 } 544 545 rds_ib_recv_init_ack(ic); 546 547 rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd, 548 ic->i_send_cq, ic->i_recv_cq); 549 550 goto out; 551 552 sends_out: 553 vfree(ic->i_sends); 554 ack_dma_out: 555 ib_dma_free_coherent(dev, sizeof(struct rds_header), 556 ic->i_ack, ic->i_ack_dma); 557 recv_hdrs_dma_out: 558 ib_dma_free_coherent(dev, ic->i_recv_ring.w_nr * 559 sizeof(struct rds_header), 560 ic->i_recv_hdrs, ic->i_recv_hdrs_dma); 561 send_hdrs_dma_out: 562 ib_dma_free_coherent(dev, ic->i_send_ring.w_nr * 563 sizeof(struct rds_header), 564 ic->i_send_hdrs, ic->i_send_hdrs_dma); 565 qp_out: 566 rdma_destroy_qp(ic->i_cm_id); 567 recv_cq_out: 568 if (!ib_destroy_cq(ic->i_recv_cq)) 569 ic->i_recv_cq = NULL; 570 send_cq_out: 571 if (!ib_destroy_cq(ic->i_send_cq)) 572 ic->i_send_cq = NULL; 573 rds_ibdev_out: 574 rds_ib_remove_conn(rds_ibdev, conn); 575 out: 576 rds_ib_dev_put(rds_ibdev); 577 578 return ret; 579 } 580 581 static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event) 582 { 583 const struct rds_ib_connect_private *dp = event->param.conn.private_data; 584 u16 common; 585 u32 version = 0; 586 587 /* 588 * rdma_cm private data is odd - when there is any private data in the 589 * request, we will be given a pretty large buffer without telling us the 590 * original size. The only way to tell the difference is by looking at 591 * the contents, which are initialized to zero. 592 * If the protocol version fields aren't set, this is a connection attempt 593 * from an older version. This could could be 3.0 or 2.0 - we can't tell. 594 * We really should have changed this for OFED 1.3 :-( 595 */ 596 597 /* Be paranoid. RDS always has privdata */ 598 if (!event->param.conn.private_data_len) { 599 printk(KERN_NOTICE "RDS incoming connection has no private data, " 600 "rejecting\n"); 601 return 0; 602 } 603 604 /* Even if len is crap *now* I still want to check it. -ASG */ 605 if (event->param.conn.private_data_len < sizeof (*dp) || 606 dp->dp_protocol_major == 0) 607 return RDS_PROTOCOL_3_0; 608 609 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; 610 if (dp->dp_protocol_major == 3 && common) { 611 version = RDS_PROTOCOL_3_0; 612 while ((common >>= 1) != 0) 613 version++; 614 } else 615 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n", 616 &dp->dp_saddr, 617 dp->dp_protocol_major, 618 dp->dp_protocol_minor); 619 return version; 620 } 621 622 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, 623 struct rdma_cm_event *event) 624 { 625 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; 626 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; 627 const struct rds_ib_connect_private *dp = event->param.conn.private_data; 628 struct rds_ib_connect_private dp_rep; 629 struct rds_connection *conn = NULL; 630 struct rds_ib_connection *ic = NULL; 631 struct rdma_conn_param conn_param; 632 u32 version; 633 int err = 1, destroy = 1; 634 635 /* Check whether the remote protocol version matches ours. */ 636 version = rds_ib_protocol_compatible(event); 637 if (!version) 638 goto out; 639 640 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " 641 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, 642 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), 643 (unsigned long long)be64_to_cpu(lguid), 644 (unsigned long long)be64_to_cpu(fguid)); 645 646 /* RDS/IB is not currently netns aware, thus init_net */ 647 conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr, 648 &rds_ib_transport, GFP_KERNEL); 649 if (IS_ERR(conn)) { 650 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); 651 conn = NULL; 652 goto out; 653 } 654 655 /* 656 * The connection request may occur while the 657 * previous connection exist, e.g. in case of failover. 658 * But as connections may be initiated simultaneously 659 * by both hosts, we have a random backoff mechanism - 660 * see the comment above rds_queue_reconnect() 661 */ 662 mutex_lock(&conn->c_cm_lock); 663 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { 664 if (rds_conn_state(conn) == RDS_CONN_UP) { 665 rdsdebug("incoming connect while connecting\n"); 666 rds_conn_drop(conn); 667 rds_ib_stats_inc(s_ib_listen_closed_stale); 668 } else 669 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { 670 /* Wait and see - our connect may still be succeeding */ 671 rds_ib_stats_inc(s_ib_connect_raced); 672 } 673 goto out; 674 } 675 676 ic = conn->c_transport_data; 677 678 rds_ib_set_protocol(conn, version); 679 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); 680 681 /* If the peer gave us the last packet it saw, process this as if 682 * we had received a regular ACK. */ 683 if (dp->dp_ack_seq) 684 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); 685 686 BUG_ON(cm_id->context); 687 BUG_ON(ic->i_cm_id); 688 689 ic->i_cm_id = cm_id; 690 cm_id->context = conn; 691 692 /* We got halfway through setting up the ib_connection, if we 693 * fail now, we have to take the long route out of this mess. */ 694 destroy = 0; 695 696 err = rds_ib_setup_qp(conn); 697 if (err) { 698 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); 699 goto out; 700 } 701 702 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version, 703 event->param.conn.responder_resources, 704 event->param.conn.initiator_depth); 705 706 /* rdma_accept() calls rdma_reject() internally if it fails */ 707 if (rdma_accept(cm_id, &conn_param)) 708 rds_ib_conn_error(conn, "rdma_accept failed\n"); 709 710 out: 711 if (conn) 712 mutex_unlock(&conn->c_cm_lock); 713 if (err) 714 rdma_reject(cm_id, NULL, 0); 715 return destroy; 716 } 717 718 719 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) 720 { 721 struct rds_connection *conn = cm_id->context; 722 struct rds_ib_connection *ic = conn->c_transport_data; 723 struct rdma_conn_param conn_param; 724 struct rds_ib_connect_private dp; 725 int ret; 726 727 /* If the peer doesn't do protocol negotiation, we must 728 * default to RDSv3.0 */ 729 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); 730 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ 731 732 ret = rds_ib_setup_qp(conn); 733 if (ret) { 734 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); 735 goto out; 736 } 737 738 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION, 739 UINT_MAX, UINT_MAX); 740 ret = rdma_connect(cm_id, &conn_param); 741 if (ret) 742 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); 743 744 out: 745 /* Beware - returning non-zero tells the rdma_cm to destroy 746 * the cm_id. We should certainly not do it as long as we still 747 * "own" the cm_id. */ 748 if (ret) { 749 if (ic->i_cm_id == cm_id) 750 ret = 0; 751 } 752 ic->i_active_side = true; 753 return ret; 754 } 755 756 int rds_ib_conn_path_connect(struct rds_conn_path *cp) 757 { 758 struct rds_connection *conn = cp->cp_conn; 759 struct rds_ib_connection *ic = conn->c_transport_data; 760 struct sockaddr_in src, dest; 761 int ret; 762 763 /* XXX I wonder what affect the port space has */ 764 /* delegate cm event handler to rdma_transport */ 765 ic->i_cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, conn, 766 RDMA_PS_TCP, IB_QPT_RC); 767 if (IS_ERR(ic->i_cm_id)) { 768 ret = PTR_ERR(ic->i_cm_id); 769 ic->i_cm_id = NULL; 770 rdsdebug("rdma_create_id() failed: %d\n", ret); 771 goto out; 772 } 773 774 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); 775 776 src.sin_family = AF_INET; 777 src.sin_addr.s_addr = (__force u32)conn->c_laddr; 778 src.sin_port = (__force u16)htons(0); 779 780 dest.sin_family = AF_INET; 781 dest.sin_addr.s_addr = (__force u32)conn->c_faddr; 782 dest.sin_port = (__force u16)htons(RDS_PORT); 783 784 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, 785 (struct sockaddr *)&dest, 786 RDS_RDMA_RESOLVE_TIMEOUT_MS); 787 if (ret) { 788 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, 789 ret); 790 rdma_destroy_id(ic->i_cm_id); 791 ic->i_cm_id = NULL; 792 } 793 794 out: 795 return ret; 796 } 797 798 /* 799 * This is so careful about only cleaning up resources that were built up 800 * so that it can be called at any point during startup. In fact it 801 * can be called multiple times for a given connection. 802 */ 803 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp) 804 { 805 struct rds_connection *conn = cp->cp_conn; 806 struct rds_ib_connection *ic = conn->c_transport_data; 807 int err = 0; 808 809 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, 810 ic->i_pd, ic->i_send_cq, ic->i_recv_cq, 811 ic->i_cm_id ? ic->i_cm_id->qp : NULL); 812 813 if (ic->i_cm_id) { 814 struct ib_device *dev = ic->i_cm_id->device; 815 816 rdsdebug("disconnecting cm %p\n", ic->i_cm_id); 817 err = rdma_disconnect(ic->i_cm_id); 818 if (err) { 819 /* Actually this may happen quite frequently, when 820 * an outgoing connect raced with an incoming connect. 821 */ 822 rdsdebug("failed to disconnect, cm: %p err %d\n", 823 ic->i_cm_id, err); 824 } 825 826 /* 827 * We want to wait for tx and rx completion to finish 828 * before we tear down the connection, but we have to be 829 * careful not to get stuck waiting on a send ring that 830 * only has unsignaled sends in it. We've shutdown new 831 * sends before getting here so by waiting for signaled 832 * sends to complete we're ensured that there will be no 833 * more tx processing. 834 */ 835 wait_event(rds_ib_ring_empty_wait, 836 rds_ib_ring_empty(&ic->i_recv_ring) && 837 (atomic_read(&ic->i_signaled_sends) == 0) && 838 (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR) && 839 (atomic_read(&ic->i_fastunreg_wrs) == RDS_IB_DEFAULT_FR_INV_WR)); 840 tasklet_kill(&ic->i_send_tasklet); 841 tasklet_kill(&ic->i_recv_tasklet); 842 843 atomic_set(&ic->i_cq_quiesce, 1); 844 845 /* first destroy the ib state that generates callbacks */ 846 if (ic->i_cm_id->qp) 847 rdma_destroy_qp(ic->i_cm_id); 848 if (ic->i_send_cq) { 849 if (ic->rds_ibdev) 850 ibdev_put_vector(ic->rds_ibdev, ic->i_scq_vector); 851 ib_destroy_cq(ic->i_send_cq); 852 } 853 854 if (ic->i_recv_cq) { 855 if (ic->rds_ibdev) 856 ibdev_put_vector(ic->rds_ibdev, ic->i_rcq_vector); 857 ib_destroy_cq(ic->i_recv_cq); 858 } 859 860 /* then free the resources that ib callbacks use */ 861 if (ic->i_send_hdrs) 862 ib_dma_free_coherent(dev, 863 ic->i_send_ring.w_nr * 864 sizeof(struct rds_header), 865 ic->i_send_hdrs, 866 ic->i_send_hdrs_dma); 867 868 if (ic->i_recv_hdrs) 869 ib_dma_free_coherent(dev, 870 ic->i_recv_ring.w_nr * 871 sizeof(struct rds_header), 872 ic->i_recv_hdrs, 873 ic->i_recv_hdrs_dma); 874 875 if (ic->i_ack) 876 ib_dma_free_coherent(dev, sizeof(struct rds_header), 877 ic->i_ack, ic->i_ack_dma); 878 879 if (ic->i_sends) 880 rds_ib_send_clear_ring(ic); 881 if (ic->i_recvs) 882 rds_ib_recv_clear_ring(ic); 883 884 rdma_destroy_id(ic->i_cm_id); 885 886 /* 887 * Move connection back to the nodev list. 888 */ 889 if (ic->rds_ibdev) 890 rds_ib_remove_conn(ic->rds_ibdev, conn); 891 892 ic->i_cm_id = NULL; 893 ic->i_pd = NULL; 894 ic->i_send_cq = NULL; 895 ic->i_recv_cq = NULL; 896 ic->i_send_hdrs = NULL; 897 ic->i_recv_hdrs = NULL; 898 ic->i_ack = NULL; 899 } 900 BUG_ON(ic->rds_ibdev); 901 902 /* Clear pending transmit */ 903 if (ic->i_data_op) { 904 struct rds_message *rm; 905 906 rm = container_of(ic->i_data_op, struct rds_message, data); 907 rds_message_put(rm); 908 ic->i_data_op = NULL; 909 } 910 911 /* Clear the ACK state */ 912 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); 913 #ifdef KERNEL_HAS_ATOMIC64 914 atomic64_set(&ic->i_ack_next, 0); 915 #else 916 ic->i_ack_next = 0; 917 #endif 918 ic->i_ack_recv = 0; 919 920 /* Clear flow control state */ 921 ic->i_flowctl = 0; 922 atomic_set(&ic->i_credits, 0); 923 924 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); 925 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); 926 927 if (ic->i_ibinc) { 928 rds_inc_put(&ic->i_ibinc->ii_inc); 929 ic->i_ibinc = NULL; 930 } 931 932 vfree(ic->i_sends); 933 ic->i_sends = NULL; 934 vfree(ic->i_recvs); 935 ic->i_recvs = NULL; 936 ic->i_active_side = false; 937 } 938 939 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) 940 { 941 struct rds_ib_connection *ic; 942 unsigned long flags; 943 int ret; 944 945 /* XXX too lazy? */ 946 ic = kzalloc(sizeof(struct rds_ib_connection), gfp); 947 if (!ic) 948 return -ENOMEM; 949 950 ret = rds_ib_recv_alloc_caches(ic); 951 if (ret) { 952 kfree(ic); 953 return ret; 954 } 955 956 INIT_LIST_HEAD(&ic->ib_node); 957 tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send, 958 (unsigned long)ic); 959 tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv, 960 (unsigned long)ic); 961 mutex_init(&ic->i_recv_mutex); 962 #ifndef KERNEL_HAS_ATOMIC64 963 spin_lock_init(&ic->i_ack_lock); 964 #endif 965 atomic_set(&ic->i_signaled_sends, 0); 966 967 /* 968 * rds_ib_conn_shutdown() waits for these to be emptied so they 969 * must be initialized before it can be called. 970 */ 971 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); 972 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); 973 974 ic->conn = conn; 975 conn->c_transport_data = ic; 976 977 spin_lock_irqsave(&ib_nodev_conns_lock, flags); 978 list_add_tail(&ic->ib_node, &ib_nodev_conns); 979 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags); 980 981 982 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); 983 return 0; 984 } 985 986 /* 987 * Free a connection. Connection must be shut down and not set for reconnect. 988 */ 989 void rds_ib_conn_free(void *arg) 990 { 991 struct rds_ib_connection *ic = arg; 992 spinlock_t *lock_ptr; 993 994 rdsdebug("ic %p\n", ic); 995 996 /* 997 * Conn is either on a dev's list or on the nodev list. 998 * A race with shutdown() or connect() would cause problems 999 * (since rds_ibdev would change) but that should never happen. 1000 */ 1001 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; 1002 1003 spin_lock_irq(lock_ptr); 1004 list_del(&ic->ib_node); 1005 spin_unlock_irq(lock_ptr); 1006 1007 rds_ib_recv_free_caches(ic); 1008 1009 kfree(ic); 1010 } 1011 1012 1013 /* 1014 * An error occurred on the connection 1015 */ 1016 void 1017 __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...) 1018 { 1019 va_list ap; 1020 1021 rds_conn_drop(conn); 1022 1023 va_start(ap, fmt); 1024 vprintk(fmt, ap); 1025 va_end(ap); 1026 } 1027