1 /* 2 * Copyright (c) 2006 Mellanox Technologies. 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 "ipoib.h" 34 35 #ifdef CONFIG_INFINIBAND_IPOIB_CM 36 37 #include <netinet/ip.h> 38 #include <netinet/ip_icmp.h> 39 #include <netinet/icmp6.h> 40 41 #include <rdma/ib_cm.h> 42 #include <rdma/ib_cache.h> 43 #include <linux/delay.h> 44 45 int ipoib_max_conn_qp = 128; 46 47 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 48 MODULE_PARM_DESC(max_nonsrq_conn_qp, 49 "Max number of connected-mode QPs per interface " 50 "(applied only if shared receive queue is not available)"); 51 52 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 53 static int data_debug_level; 54 55 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 56 MODULE_PARM_DESC(cm_data_debug_level, 57 "Enable data path debug tracing for connected mode if > 0"); 58 #endif 59 60 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 61 62 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 63 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 64 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 65 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 66 67 static struct ib_qp_attr ipoib_cm_err_attr = { 68 .qp_state = IB_QPS_ERR 69 }; 70 71 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 72 73 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 74 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 75 .opcode = IB_WR_SEND, 76 }; 77 78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 79 struct ib_cm_event *event); 80 81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 82 { 83 84 ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req); 85 86 } 87 88 static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id) 89 { 90 struct ib_recv_wr *bad_wr; 91 struct ipoib_rx_buf *rx_req; 92 struct mbuf *m; 93 int ret; 94 int i; 95 96 rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id]; 97 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 98 priv->cm.rx_sge[i].addr = rx_req->mapping[i]; 99 priv->cm.rx_sge[i].length = m->m_len; 100 } 101 102 priv->cm.rx_wr.num_sge = i; 103 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 104 105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 106 if (unlikely(ret)) { 107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 108 ipoib_dma_unmap_rx(priv, rx_req); 109 m_freem(priv->cm.srq_ring[id].mb); 110 priv->cm.srq_ring[id].mb = NULL; 111 } 112 113 return ret; 114 } 115 116 static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv, 117 struct ipoib_cm_rx *rx, 118 struct ib_recv_wr *wr, 119 struct ib_sge *sge, int id) 120 { 121 struct ipoib_rx_buf *rx_req; 122 struct ib_recv_wr *bad_wr; 123 struct mbuf *m; 124 int ret; 125 int i; 126 127 rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id]; 128 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 129 sge[i].addr = rx_req->mapping[i]; 130 sge[i].length = m->m_len; 131 } 132 133 wr->num_sge = i; 134 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 135 136 ret = ib_post_recv(rx->qp, wr, &bad_wr); 137 if (unlikely(ret)) { 138 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 139 ipoib_dma_unmap_rx(priv, rx_req); 140 m_freem(rx->rx_ring[id].mb); 141 rx->rx_ring[id].mb = NULL; 142 } 143 144 return ret; 145 } 146 147 static struct mbuf * 148 ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 149 { 150 return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req, 151 priv->cm.max_cm_mtu); 152 } 153 154 static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv, 155 struct ipoib_cm_rx_buf *rx_ring) 156 { 157 int i; 158 159 for (i = 0; i < ipoib_recvq_size; ++i) 160 if (rx_ring[i].mb) { 161 ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]); 162 m_freem(rx_ring[i].mb); 163 } 164 165 kfree(rx_ring); 166 } 167 168 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 169 { 170 struct ib_send_wr *bad_wr; 171 struct ipoib_cm_rx *p; 172 173 /* We only reserved 1 extra slot in CQ for drain WRs, so 174 * make sure we have at most 1 outstanding WR. */ 175 if (list_empty(&priv->cm.rx_flush_list) || 176 !list_empty(&priv->cm.rx_drain_list)) 177 return; 178 179 /* 180 * QPs on flush list are error state. This way, a "flush 181 * error" WC will be immediately generated for each WR we post. 182 */ 183 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 184 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 185 ipoib_warn(priv, "failed to post drain wr\n"); 186 187 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 188 } 189 190 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 191 { 192 struct ipoib_cm_rx *p = ctx; 193 struct ipoib_dev_priv *priv = p->priv; 194 unsigned long flags; 195 196 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 197 return; 198 199 spin_lock_irqsave(&priv->lock, flags); 200 list_move(&p->list, &priv->cm.rx_flush_list); 201 p->state = IPOIB_CM_RX_FLUSH; 202 ipoib_cm_start_rx_drain(priv); 203 spin_unlock_irqrestore(&priv->lock, flags); 204 } 205 206 static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv, 207 struct ipoib_cm_rx *p) 208 { 209 struct ib_qp_init_attr attr = { 210 .event_handler = ipoib_cm_rx_event_handler, 211 .send_cq = priv->recv_cq, /* For drain WR */ 212 .recv_cq = priv->recv_cq, 213 .srq = priv->cm.srq, 214 .cap.max_send_wr = 1, /* For drain WR */ 215 .cap.max_send_sge = 1, 216 .sq_sig_type = IB_SIGNAL_ALL_WR, 217 .qp_type = IB_QPT_RC, 218 .qp_context = p, 219 }; 220 221 if (!ipoib_cm_has_srq(priv)) { 222 attr.cap.max_recv_wr = ipoib_recvq_size; 223 attr.cap.max_recv_sge = priv->cm.num_frags; 224 } 225 226 return ib_create_qp(priv->pd, &attr); 227 } 228 229 static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv, 230 struct ib_cm_id *cm_id, struct ib_qp *qp, 231 unsigned psn) 232 { 233 struct ib_qp_attr qp_attr; 234 int qp_attr_mask, ret; 235 236 qp_attr.qp_state = IB_QPS_INIT; 237 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 238 if (ret) { 239 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 240 return ret; 241 } 242 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 243 if (ret) { 244 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 245 return ret; 246 } 247 qp_attr.qp_state = IB_QPS_RTR; 248 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 249 if (ret) { 250 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 251 return ret; 252 } 253 qp_attr.rq_psn = psn; 254 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 255 if (ret) { 256 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 257 return ret; 258 } 259 260 /* 261 * Current Mellanox HCA firmware won't generate completions 262 * with error for drain WRs unless the QP has been moved to 263 * RTS first. This work-around leaves a window where a QP has 264 * moved to error asynchronously, but this will eventually get 265 * fixed in firmware, so let's not error out if modify QP 266 * fails. 267 */ 268 qp_attr.qp_state = IB_QPS_RTS; 269 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 270 if (ret) { 271 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 272 return 0; 273 } 274 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 275 if (ret) { 276 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 277 return 0; 278 } 279 280 return 0; 281 } 282 283 static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv, 284 struct ib_recv_wr *wr, 285 struct ib_sge *sge) 286 { 287 int i; 288 289 for (i = 0; i < IPOIB_CM_RX_SG; i++) 290 sge[i].lkey = priv->mr->lkey; 291 292 wr->next = NULL; 293 wr->sg_list = sge; 294 wr->num_sge = 1; 295 } 296 297 static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv, 298 struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx) 299 { 300 struct { 301 struct ib_recv_wr wr; 302 struct ib_sge sge[IPOIB_CM_RX_SG]; 303 } *t; 304 int ret; 305 int i; 306 307 rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL); 308 if (!rx->rx_ring) { 309 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 310 priv->ca->name, ipoib_recvq_size); 311 return -ENOMEM; 312 } 313 314 memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring); 315 316 t = kmalloc(sizeof *t, GFP_KERNEL); 317 if (!t) { 318 ret = -ENOMEM; 319 goto err_free; 320 } 321 322 ipoib_cm_init_rx_wr(priv, &t->wr, t->sge); 323 324 spin_lock_irq(&priv->lock); 325 326 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 327 spin_unlock_irq(&priv->lock); 328 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 329 ret = -EINVAL; 330 goto err_free; 331 } else 332 ++priv->cm.nonsrq_conn_qp; 333 334 spin_unlock_irq(&priv->lock); 335 336 for (i = 0; i < ipoib_recvq_size; ++i) { 337 if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) { 338 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 339 ret = -ENOMEM; 340 goto err_count; 341 } 342 ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i); 343 if (ret) { 344 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 345 "failed for buf %d\n", i); 346 ret = -EIO; 347 goto err_count; 348 } 349 } 350 351 rx->recv_count = ipoib_recvq_size; 352 353 kfree(t); 354 355 return 0; 356 357 err_count: 358 spin_lock_irq(&priv->lock); 359 --priv->cm.nonsrq_conn_qp; 360 spin_unlock_irq(&priv->lock); 361 362 err_free: 363 kfree(t); 364 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 365 366 return ret; 367 } 368 369 static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, 370 struct ib_qp *qp, struct ib_cm_req_event_param *req, 371 unsigned psn) 372 { 373 struct ipoib_cm_data data = {}; 374 struct ib_cm_rep_param rep = {}; 375 376 data.qpn = cpu_to_be32(priv->qp->qp_num); 377 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 378 379 rep.private_data = &data; 380 rep.private_data_len = sizeof data; 381 rep.flow_control = 0; 382 rep.rnr_retry_count = req->rnr_retry_count; 383 rep.srq = ipoib_cm_has_srq(priv); 384 rep.qp_num = qp->qp_num; 385 rep.starting_psn = psn; 386 return ib_send_cm_rep(cm_id, &rep); 387 } 388 389 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 390 { 391 struct ipoib_dev_priv *priv = cm_id->context; 392 struct ipoib_cm_rx *p; 393 unsigned psn; 394 int ret; 395 396 ipoib_dbg(priv, "REQ arrived\n"); 397 p = kzalloc(sizeof *p, GFP_KERNEL); 398 if (!p) 399 return -ENOMEM; 400 p->priv = priv; 401 p->id = cm_id; 402 cm_id->context = p; 403 p->state = IPOIB_CM_RX_LIVE; 404 p->jiffies = jiffies; 405 INIT_LIST_HEAD(&p->list); 406 407 p->qp = ipoib_cm_create_rx_qp(priv, p); 408 if (IS_ERR(p->qp)) { 409 ret = PTR_ERR(p->qp); 410 goto err_qp; 411 } 412 413 psn = random() & 0xffffff; 414 ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn); 415 if (ret) 416 goto err_modify; 417 418 if (!ipoib_cm_has_srq(priv)) { 419 ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p); 420 if (ret) 421 goto err_modify; 422 } 423 424 spin_lock_irq(&priv->lock); 425 queue_delayed_work(ipoib_workqueue, 426 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 427 /* Add this entry to passive ids list head, but do not re-add it 428 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 429 p->jiffies = jiffies; 430 if (p->state == IPOIB_CM_RX_LIVE) 431 list_move(&p->list, &priv->cm.passive_ids); 432 spin_unlock_irq(&priv->lock); 433 434 ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn); 435 if (ret) { 436 ipoib_warn(priv, "failed to send REP: %d\n", ret); 437 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 438 ipoib_warn(priv, "unable to move qp to error state\n"); 439 } 440 return 0; 441 442 err_modify: 443 ib_destroy_qp(p->qp); 444 err_qp: 445 kfree(p); 446 return ret; 447 } 448 449 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 450 struct ib_cm_event *event) 451 { 452 struct ipoib_cm_rx *p; 453 struct ipoib_dev_priv *priv; 454 455 switch (event->event) { 456 case IB_CM_REQ_RECEIVED: 457 return ipoib_cm_req_handler(cm_id, event); 458 case IB_CM_DREQ_RECEIVED: 459 p = cm_id->context; 460 ib_send_cm_drep(cm_id, NULL, 0); 461 /* Fall through */ 462 case IB_CM_REJ_RECEIVED: 463 p = cm_id->context; 464 priv = p->priv; 465 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 466 ipoib_warn(priv, "unable to move qp to error state\n"); 467 /* Fall through */ 468 default: 469 return 0; 470 } 471 } 472 473 void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 474 { 475 struct ipoib_cm_rx_buf saverx; 476 struct ipoib_cm_rx_buf *rx_ring; 477 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 478 struct ifnet *dev = priv->dev; 479 struct mbuf *mb, *newmb; 480 struct ipoib_cm_rx *p; 481 int has_srq; 482 u_short proto; 483 484 CURVNET_SET_QUIET(dev->if_vnet); 485 486 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 487 wr_id, wc->status); 488 489 if (unlikely(wr_id >= ipoib_recvq_size)) { 490 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 491 spin_lock(&priv->lock); 492 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 493 ipoib_cm_start_rx_drain(priv); 494 if (priv->cm.id != NULL) 495 queue_work(ipoib_workqueue, 496 &priv->cm.rx_reap_task); 497 spin_unlock(&priv->lock); 498 } else 499 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 500 wr_id, ipoib_recvq_size); 501 goto done; 502 } 503 504 p = wc->qp->qp_context; 505 506 has_srq = ipoib_cm_has_srq(priv); 507 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 508 509 mb = rx_ring[wr_id].mb; 510 511 if (unlikely(wc->status != IB_WC_SUCCESS)) { 512 ipoib_dbg(priv, "cm recv error " 513 "(status=%d, wrid=%d vend_err %x)\n", 514 wc->status, wr_id, wc->vendor_err); 515 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 516 if (has_srq) 517 goto repost; 518 else { 519 if (!--p->recv_count) { 520 spin_lock(&priv->lock); 521 list_move(&p->list, &priv->cm.rx_reap_list); 522 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 523 spin_unlock(&priv->lock); 524 } 525 goto done; 526 } 527 } 528 529 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 530 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 531 p->jiffies = jiffies; 532 /* Move this entry to list head, but do not re-add it 533 * if it has been moved out of list. */ 534 if (p->state == IPOIB_CM_RX_LIVE) 535 list_move(&p->list, &priv->cm.passive_ids); 536 } 537 } 538 539 memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx)); 540 newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]); 541 if (unlikely(!newmb)) { 542 /* 543 * If we can't allocate a new RX buffer, dump 544 * this packet and reuse the old buffer. 545 */ 546 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 547 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 548 memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx)); 549 goto repost; 550 } 551 552 ipoib_cm_dma_unmap_rx(priv, &saverx); 553 554 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 555 wc->byte_len, wc->slid); 556 557 ipoib_dma_mb(priv, mb, wc->byte_len); 558 559 if_inc_counter(dev, IFCOUNTER_IPACKETS, 1); 560 if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len); 561 562 mb->m_pkthdr.rcvif = dev; 563 proto = *mtod(mb, uint16_t *); 564 m_adj(mb, IPOIB_ENCAP_LEN); 565 566 IPOIB_MTAP_PROTO(dev, mb, proto); 567 ipoib_demux(dev, mb, ntohs(proto)); 568 569 repost: 570 if (has_srq) { 571 if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id))) 572 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 573 "for buf %d\n", wr_id); 574 } else { 575 if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p, 576 &priv->cm.rx_wr, 577 priv->cm.rx_sge, 578 wr_id))) { 579 --p->recv_count; 580 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 581 "for buf %d\n", wr_id); 582 } 583 } 584 done: 585 CURVNET_RESTORE(); 586 return; 587 } 588 589 static inline int post_send(struct ipoib_dev_priv *priv, 590 struct ipoib_cm_tx *tx, 591 struct ipoib_cm_tx_buf *tx_req, 592 unsigned int wr_id) 593 { 594 struct ib_send_wr *bad_wr; 595 struct mbuf *mb = tx_req->mb; 596 u64 *mapping = tx_req->mapping; 597 struct mbuf *m; 598 int i; 599 600 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) { 601 priv->tx_sge[i].addr = mapping[i]; 602 priv->tx_sge[i].length = m->m_len; 603 } 604 priv->tx_wr.num_sge = i; 605 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 606 priv->tx_wr.opcode = IB_WR_SEND; 607 608 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 609 } 610 611 void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx) 612 { 613 struct ipoib_cm_tx_buf *tx_req; 614 struct ifnet *dev = priv->dev; 615 616 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 617 while (ipoib_poll_tx(priv)); /* nothing */ 618 619 m_adj(mb, sizeof(struct ipoib_pseudoheader)); 620 if (unlikely(mb->m_pkthdr.len > tx->mtu)) { 621 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 622 mb->m_pkthdr.len, tx->mtu); 623 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 624 ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu)); 625 return; 626 } 627 628 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 629 tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num); 630 631 632 /* 633 * We put the mb into the tx_ring _before_ we call post_send() 634 * because it's entirely possible that the completion handler will 635 * run before we execute anything after the post_send(). That 636 * means we have to make sure everything is properly recorded and 637 * our state is consistent before we call post_send(). 638 */ 639 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 640 tx_req->mb = mb; 641 if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req, 642 priv->cm.num_frags))) { 643 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 644 if (tx_req->mb) 645 m_freem(tx_req->mb); 646 return; 647 } 648 649 if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) { 650 ipoib_warn(priv, "post_send failed\n"); 651 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 652 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 653 m_freem(mb); 654 } else { 655 ++tx->tx_head; 656 657 if (++priv->tx_outstanding == ipoib_sendq_size) { 658 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 659 tx->qp->qp_num); 660 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 661 ipoib_warn(priv, "request notify on send CQ failed\n"); 662 dev->if_drv_flags |= IFF_DRV_OACTIVE; 663 } 664 } 665 666 } 667 668 void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 669 { 670 struct ipoib_cm_tx *tx = wc->qp->qp_context; 671 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 672 struct ifnet *dev = priv->dev; 673 struct ipoib_cm_tx_buf *tx_req; 674 675 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 676 wr_id, wc->status); 677 678 if (unlikely(wr_id >= ipoib_sendq_size)) { 679 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 680 wr_id, ipoib_sendq_size); 681 return; 682 } 683 684 tx_req = &tx->tx_ring[wr_id]; 685 686 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 687 688 /* FIXME: is this right? Shouldn't we only increment on success? */ 689 if_inc_counter(dev, IFCOUNTER_OPACKETS, 1); 690 691 m_freem(tx_req->mb); 692 693 ++tx->tx_tail; 694 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 695 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 696 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 697 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 698 699 if (wc->status != IB_WC_SUCCESS && 700 wc->status != IB_WC_WR_FLUSH_ERR) { 701 struct ipoib_path *path; 702 703 ipoib_dbg(priv, "failed cm send event " 704 "(status=%d, wrid=%d vend_err %x)\n", 705 wc->status, wr_id, wc->vendor_err); 706 707 path = tx->path; 708 709 if (path) { 710 path->cm = NULL; 711 rb_erase(&path->rb_node, &priv->path_tree); 712 list_del(&path->list); 713 } 714 715 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 716 list_move(&tx->list, &priv->cm.reap_list); 717 queue_work(ipoib_workqueue, &priv->cm.reap_task); 718 } 719 720 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 721 } 722 723 } 724 725 int ipoib_cm_dev_open(struct ipoib_dev_priv *priv) 726 { 727 int ret; 728 729 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev))) 730 return 0; 731 732 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv); 733 if (IS_ERR(priv->cm.id)) { 734 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 735 ret = PTR_ERR(priv->cm.id); 736 goto err_cm; 737 } 738 739 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 740 0, NULL); 741 if (ret) { 742 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 743 IPOIB_CM_IETF_ID | priv->qp->qp_num); 744 goto err_listen; 745 } 746 747 return 0; 748 749 err_listen: 750 ib_destroy_cm_id(priv->cm.id); 751 err_cm: 752 priv->cm.id = NULL; 753 return ret; 754 } 755 756 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv) 757 { 758 struct ipoib_cm_rx *rx, *n; 759 LIST_HEAD(list); 760 761 spin_lock_irq(&priv->lock); 762 list_splice_init(&priv->cm.rx_reap_list, &list); 763 spin_unlock_irq(&priv->lock); 764 765 list_for_each_entry_safe(rx, n, &list, list) { 766 ib_destroy_cm_id(rx->id); 767 ib_destroy_qp(rx->qp); 768 if (!ipoib_cm_has_srq(priv)) { 769 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 770 spin_lock_irq(&priv->lock); 771 --priv->cm.nonsrq_conn_qp; 772 spin_unlock_irq(&priv->lock); 773 } 774 kfree(rx); 775 } 776 } 777 778 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv) 779 { 780 struct ipoib_cm_rx *p; 781 unsigned long begin; 782 int ret; 783 784 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id) 785 return; 786 787 ib_destroy_cm_id(priv->cm.id); 788 priv->cm.id = NULL; 789 790 cancel_work_sync(&priv->cm.rx_reap_task); 791 792 spin_lock_irq(&priv->lock); 793 while (!list_empty(&priv->cm.passive_ids)) { 794 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 795 list_move(&p->list, &priv->cm.rx_error_list); 796 p->state = IPOIB_CM_RX_ERROR; 797 spin_unlock_irq(&priv->lock); 798 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 799 if (ret) 800 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 801 spin_lock_irq(&priv->lock); 802 } 803 804 /* Wait for all RX to be drained */ 805 begin = jiffies; 806 807 while (!list_empty(&priv->cm.rx_error_list) || 808 !list_empty(&priv->cm.rx_flush_list) || 809 !list_empty(&priv->cm.rx_drain_list)) { 810 if (time_after(jiffies, begin + 5 * HZ)) { 811 ipoib_warn(priv, "RX drain timing out\n"); 812 813 /* 814 * assume the HW is wedged and just free up everything. 815 */ 816 list_splice_init(&priv->cm.rx_flush_list, 817 &priv->cm.rx_reap_list); 818 list_splice_init(&priv->cm.rx_error_list, 819 &priv->cm.rx_reap_list); 820 list_splice_init(&priv->cm.rx_drain_list, 821 &priv->cm.rx_reap_list); 822 break; 823 } 824 spin_unlock_irq(&priv->lock); 825 msleep(1); 826 ipoib_drain_cq(priv); 827 spin_lock_irq(&priv->lock); 828 } 829 830 spin_unlock_irq(&priv->lock); 831 832 ipoib_cm_free_rx_reap_list(priv); 833 834 cancel_delayed_work(&priv->cm.stale_task); 835 } 836 837 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 838 { 839 struct ipoib_cm_tx *p = cm_id->context; 840 struct ipoib_dev_priv *priv = p->priv; 841 struct ipoib_cm_data *data = event->private_data; 842 struct ifqueue mbqueue; 843 struct ib_qp_attr qp_attr; 844 int qp_attr_mask, ret; 845 struct mbuf *mb; 846 847 ipoib_dbg(priv, "cm rep handler\n"); 848 p->mtu = be32_to_cpu(data->mtu); 849 850 if (p->mtu <= IPOIB_ENCAP_LEN) { 851 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 852 p->mtu, IPOIB_ENCAP_LEN); 853 return -EINVAL; 854 } 855 856 qp_attr.qp_state = IB_QPS_RTR; 857 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 858 if (ret) { 859 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 860 return ret; 861 } 862 863 qp_attr.rq_psn = 0 /* FIXME */; 864 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 865 if (ret) { 866 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 867 return ret; 868 } 869 870 qp_attr.qp_state = IB_QPS_RTS; 871 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 872 if (ret) { 873 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 874 return ret; 875 } 876 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 877 if (ret) { 878 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 879 return ret; 880 } 881 882 bzero(&mbqueue, sizeof(mbqueue)); 883 884 spin_lock_irq(&priv->lock); 885 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 886 if (p->path) 887 for (;;) { 888 _IF_DEQUEUE(&p->path->queue, mb); 889 if (mb == NULL) 890 break; 891 _IF_ENQUEUE(&mbqueue, mb); 892 } 893 spin_unlock_irq(&priv->lock); 894 895 for (;;) { 896 struct ifnet *dev = p->priv->dev; 897 _IF_DEQUEUE(&mbqueue, mb); 898 if (mb == NULL) 899 break; 900 mb->m_pkthdr.rcvif = dev; 901 if (dev->if_transmit(dev, mb)) 902 ipoib_warn(priv, "dev_queue_xmit failed " 903 "to requeue packet\n"); 904 } 905 906 ret = ib_send_cm_rtu(cm_id, NULL, 0); 907 if (ret) { 908 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 909 return ret; 910 } 911 return 0; 912 } 913 914 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv, 915 struct ipoib_cm_tx *tx) 916 { 917 struct ib_qp_init_attr attr = { 918 .send_cq = priv->send_cq, 919 .recv_cq = priv->recv_cq, 920 .srq = priv->cm.srq, 921 .cap.max_send_wr = ipoib_sendq_size, 922 .cap.max_send_sge = priv->cm.num_frags, 923 .sq_sig_type = IB_SIGNAL_ALL_WR, 924 .qp_type = IB_QPT_RC, 925 .qp_context = tx 926 }; 927 928 return ib_create_qp(priv->pd, &attr); 929 } 930 931 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv, 932 struct ib_cm_id *id, struct ib_qp *qp, 933 u32 qpn, 934 struct ib_sa_path_rec *pathrec) 935 { 936 struct ipoib_cm_data data = {}; 937 struct ib_cm_req_param req = {}; 938 939 ipoib_dbg(priv, "cm send req\n"); 940 941 data.qpn = cpu_to_be32(priv->qp->qp_num); 942 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 943 944 req.primary_path = pathrec; 945 req.alternate_path = NULL; 946 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 947 req.qp_num = qp->qp_num; 948 req.qp_type = qp->qp_type; 949 req.private_data = &data; 950 req.private_data_len = sizeof data; 951 req.flow_control = 0; 952 953 req.starting_psn = 0; /* FIXME */ 954 955 /* 956 * Pick some arbitrary defaults here; we could make these 957 * module parameters if anyone cared about setting them. 958 */ 959 req.responder_resources = 4; 960 req.remote_cm_response_timeout = 20; 961 req.local_cm_response_timeout = 20; 962 req.retry_count = 0; /* RFC draft warns against retries */ 963 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 964 req.max_cm_retries = 15; 965 req.srq = ipoib_cm_has_srq(priv); 966 return ib_send_cm_req(id, &req); 967 } 968 969 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv, 970 struct ib_cm_id *cm_id, struct ib_qp *qp) 971 { 972 struct ib_qp_attr qp_attr; 973 int qp_attr_mask, ret; 974 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 975 if (ret) { 976 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 977 return ret; 978 } 979 980 qp_attr.qp_state = IB_QPS_INIT; 981 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 982 qp_attr.port_num = priv->port; 983 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 984 985 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 986 if (ret) { 987 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 988 return ret; 989 } 990 return 0; 991 } 992 993 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 994 struct ib_sa_path_rec *pathrec) 995 { 996 struct ipoib_dev_priv *priv = p->priv; 997 int ret; 998 999 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL); 1000 if (!p->tx_ring) { 1001 ipoib_warn(priv, "failed to allocate tx ring\n"); 1002 ret = -ENOMEM; 1003 goto err_tx; 1004 } 1005 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1006 1007 p->qp = ipoib_cm_create_tx_qp(p->priv, p); 1008 if (IS_ERR(p->qp)) { 1009 ret = PTR_ERR(p->qp); 1010 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1011 goto err_qp; 1012 } 1013 1014 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1015 if (IS_ERR(p->id)) { 1016 ret = PTR_ERR(p->id); 1017 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1018 goto err_id; 1019 } 1020 1021 ret = ipoib_cm_modify_tx_init(p->priv, p->id, p->qp); 1022 if (ret) { 1023 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1024 goto err_modify; 1025 } 1026 1027 ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec); 1028 if (ret) { 1029 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1030 goto err_send_cm; 1031 } 1032 1033 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1034 p->qp->qp_num, pathrec->dgid.raw, qpn); 1035 1036 return 0; 1037 1038 err_send_cm: 1039 err_modify: 1040 ib_destroy_cm_id(p->id); 1041 err_id: 1042 p->id = NULL; 1043 ib_destroy_qp(p->qp); 1044 err_qp: 1045 p->qp = NULL; 1046 kfree(p->tx_ring); 1047 err_tx: 1048 return ret; 1049 } 1050 1051 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1052 { 1053 struct ipoib_dev_priv *priv = p->priv; 1054 struct ifnet *dev = priv->dev; 1055 struct ipoib_cm_tx_buf *tx_req; 1056 unsigned long begin; 1057 1058 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1059 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1060 1061 if (p->path) 1062 ipoib_path_free(priv, p->path); 1063 1064 if (p->id) 1065 ib_destroy_cm_id(p->id); 1066 1067 if (p->tx_ring) { 1068 /* Wait for all sends to complete */ 1069 begin = jiffies; 1070 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1071 if (time_after(jiffies, begin + 5 * HZ)) { 1072 ipoib_warn(priv, "timing out; %d sends not completed\n", 1073 p->tx_head - p->tx_tail); 1074 goto timeout; 1075 } 1076 1077 msleep(1); 1078 } 1079 } 1080 1081 timeout: 1082 1083 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1084 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1085 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 1086 m_freem(tx_req->mb); 1087 ++p->tx_tail; 1088 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1089 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 1090 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1091 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 1092 } 1093 1094 if (p->qp) 1095 ib_destroy_qp(p->qp); 1096 1097 kfree(p->tx_ring); 1098 kfree(p); 1099 } 1100 1101 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1102 struct ib_cm_event *event) 1103 { 1104 struct ipoib_cm_tx *tx = cm_id->context; 1105 struct ipoib_dev_priv *priv = tx->priv; 1106 struct ipoib_path *path; 1107 unsigned long flags; 1108 int ret; 1109 1110 switch (event->event) { 1111 case IB_CM_DREQ_RECEIVED: 1112 ipoib_dbg(priv, "DREQ received.\n"); 1113 ib_send_cm_drep(cm_id, NULL, 0); 1114 break; 1115 case IB_CM_REP_RECEIVED: 1116 ipoib_dbg(priv, "REP received.\n"); 1117 ret = ipoib_cm_rep_handler(cm_id, event); 1118 if (ret) 1119 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1120 NULL, 0, NULL, 0); 1121 break; 1122 case IB_CM_REQ_ERROR: 1123 case IB_CM_REJ_RECEIVED: 1124 case IB_CM_TIMEWAIT_EXIT: 1125 ipoib_dbg(priv, "CM error %d.\n", event->event); 1126 spin_lock_irqsave(&priv->lock, flags); 1127 path = tx->path; 1128 1129 if (path) { 1130 path->cm = NULL; 1131 tx->path = NULL; 1132 rb_erase(&path->rb_node, &priv->path_tree); 1133 list_del(&path->list); 1134 } 1135 1136 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1137 list_move(&tx->list, &priv->cm.reap_list); 1138 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1139 } 1140 1141 spin_unlock_irqrestore(&priv->lock, flags); 1142 if (path) 1143 ipoib_path_free(tx->priv, path); 1144 break; 1145 default: 1146 break; 1147 } 1148 1149 return 0; 1150 } 1151 1152 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv, 1153 struct ipoib_path *path) 1154 { 1155 struct ipoib_cm_tx *tx; 1156 1157 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1158 if (!tx) 1159 return NULL; 1160 1161 ipoib_dbg(priv, "Creating cm tx\n"); 1162 path->cm = tx; 1163 tx->path = path; 1164 tx->priv = priv; 1165 list_add(&tx->list, &priv->cm.start_list); 1166 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1167 queue_work(ipoib_workqueue, &priv->cm.start_task); 1168 return tx; 1169 } 1170 1171 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1172 { 1173 struct ipoib_dev_priv *priv = tx->priv; 1174 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1175 spin_lock(&priv->lock); 1176 list_move(&tx->list, &priv->cm.reap_list); 1177 spin_unlock(&priv->lock); 1178 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1179 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1180 tx->path->pathrec.dgid.raw); 1181 tx->path = NULL; 1182 } 1183 } 1184 1185 static void ipoib_cm_tx_start(struct work_struct *work) 1186 { 1187 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1188 cm.start_task); 1189 struct ipoib_path *path; 1190 struct ipoib_cm_tx *p; 1191 unsigned long flags; 1192 int ret; 1193 1194 struct ib_sa_path_rec pathrec; 1195 u32 qpn; 1196 1197 ipoib_dbg(priv, "cm start task\n"); 1198 spin_lock_irqsave(&priv->lock, flags); 1199 1200 while (!list_empty(&priv->cm.start_list)) { 1201 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1202 list_del_init(&p->list); 1203 path = p->path; 1204 qpn = IPOIB_QPN(path->hwaddr); 1205 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1206 1207 spin_unlock_irqrestore(&priv->lock, flags); 1208 1209 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1210 1211 spin_lock_irqsave(&priv->lock, flags); 1212 1213 if (ret) { 1214 path = p->path; 1215 if (path) { 1216 path->cm = NULL; 1217 rb_erase(&path->rb_node, &priv->path_tree); 1218 list_del(&path->list); 1219 ipoib_path_free(priv, path); 1220 } 1221 list_del(&p->list); 1222 kfree(p); 1223 } 1224 } 1225 1226 spin_unlock_irqrestore(&priv->lock, flags); 1227 } 1228 1229 static void ipoib_cm_tx_reap(struct work_struct *work) 1230 { 1231 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1232 cm.reap_task); 1233 struct ipoib_cm_tx *p; 1234 unsigned long flags; 1235 1236 spin_lock_irqsave(&priv->lock, flags); 1237 1238 while (!list_empty(&priv->cm.reap_list)) { 1239 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1240 list_del(&p->list); 1241 spin_unlock_irqrestore(&priv->lock, flags); 1242 ipoib_cm_tx_destroy(p); 1243 spin_lock_irqsave(&priv->lock, flags); 1244 } 1245 1246 spin_unlock_irqrestore(&priv->lock, flags); 1247 } 1248 1249 static void ipoib_cm_mb_reap(struct work_struct *work) 1250 { 1251 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1252 cm.mb_task); 1253 struct mbuf *mb; 1254 unsigned long flags; 1255 #if defined(INET) || defined(INET6) 1256 unsigned mtu = priv->mcast_mtu; 1257 #endif 1258 uint16_t proto; 1259 1260 spin_lock_irqsave(&priv->lock, flags); 1261 1262 for (;;) { 1263 IF_DEQUEUE(&priv->cm.mb_queue, mb); 1264 if (mb == NULL) 1265 break; 1266 spin_unlock_irqrestore(&priv->lock, flags); 1267 1268 proto = htons(*mtod(mb, uint16_t *)); 1269 m_adj(mb, IPOIB_ENCAP_LEN); 1270 switch (proto) { 1271 #if defined(INET) 1272 case ETHERTYPE_IP: 1273 icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu); 1274 break; 1275 #endif 1276 #if defined(INET6) 1277 case ETHERTYPE_IPV6: 1278 icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu); 1279 break; 1280 #endif 1281 default: 1282 m_freem(mb); 1283 } 1284 1285 spin_lock_irqsave(&priv->lock, flags); 1286 } 1287 1288 spin_unlock_irqrestore(&priv->lock, flags); 1289 } 1290 1291 void 1292 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu) 1293 { 1294 int e = priv->cm.mb_queue.ifq_len; 1295 1296 IF_ENQUEUE(&priv->cm.mb_queue, mb); 1297 if (e == 0) 1298 queue_work(ipoib_workqueue, &priv->cm.mb_task); 1299 } 1300 1301 static void ipoib_cm_rx_reap(struct work_struct *work) 1302 { 1303 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1304 cm.rx_reap_task)); 1305 } 1306 1307 static void ipoib_cm_stale_task(struct work_struct *work) 1308 { 1309 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1310 cm.stale_task.work); 1311 struct ipoib_cm_rx *p; 1312 int ret; 1313 1314 spin_lock_irq(&priv->lock); 1315 while (!list_empty(&priv->cm.passive_ids)) { 1316 /* List is sorted by LRU, start from tail, 1317 * stop when we see a recently used entry */ 1318 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1319 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1320 break; 1321 list_move(&p->list, &priv->cm.rx_error_list); 1322 p->state = IPOIB_CM_RX_ERROR; 1323 spin_unlock_irq(&priv->lock); 1324 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1325 if (ret) 1326 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1327 spin_lock_irq(&priv->lock); 1328 } 1329 1330 if (!list_empty(&priv->cm.passive_ids)) 1331 queue_delayed_work(ipoib_workqueue, 1332 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1333 spin_unlock_irq(&priv->lock); 1334 } 1335 1336 1337 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge) 1338 { 1339 struct ib_srq_init_attr srq_init_attr = { 1340 .attr = { 1341 .max_wr = ipoib_recvq_size, 1342 .max_sge = max_sge 1343 } 1344 }; 1345 1346 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1347 if (IS_ERR(priv->cm.srq)) { 1348 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1349 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1350 priv->ca->name, PTR_ERR(priv->cm.srq)); 1351 priv->cm.srq = NULL; 1352 return; 1353 } 1354 1355 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL); 1356 if (!priv->cm.srq_ring) { 1357 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1358 priv->ca->name, ipoib_recvq_size); 1359 ib_destroy_srq(priv->cm.srq); 1360 priv->cm.srq = NULL; 1361 return; 1362 } 1363 1364 memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1365 } 1366 1367 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv) 1368 { 1369 struct ifnet *dev = priv->dev; 1370 int i, ret; 1371 struct ib_device_attr attr; 1372 1373 INIT_LIST_HEAD(&priv->cm.passive_ids); 1374 INIT_LIST_HEAD(&priv->cm.reap_list); 1375 INIT_LIST_HEAD(&priv->cm.start_list); 1376 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1377 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1378 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1379 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1380 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1381 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1382 INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap); 1383 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1384 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1385 1386 bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue)); 1387 mtx_init(&priv->cm.mb_queue.ifq_mtx, 1388 dev->if_xname, "if send queue", MTX_DEF); 1389 1390 ret = ib_query_device(priv->ca, &attr); 1391 if (ret) { 1392 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1393 return ret; 1394 } 1395 1396 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1397 1398 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1399 ipoib_cm_create_srq(priv, attr.max_srq_sge); 1400 if (ipoib_cm_has_srq(priv)) { 1401 priv->cm.max_cm_mtu = attr.max_srq_sge * MJUMPAGESIZE; 1402 priv->cm.num_frags = attr.max_srq_sge; 1403 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1404 priv->cm.max_cm_mtu, priv->cm.num_frags); 1405 } else { 1406 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU; 1407 priv->cm.num_frags = IPOIB_CM_RX_SG; 1408 } 1409 1410 ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge); 1411 1412 if (ipoib_cm_has_srq(priv)) { 1413 for (i = 0; i < ipoib_recvq_size; ++i) { 1414 if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) { 1415 ipoib_warn(priv, "failed to allocate " 1416 "receive buffer %d\n", i); 1417 ipoib_cm_dev_cleanup(priv); 1418 return -ENOMEM; 1419 } 1420 1421 if (ipoib_cm_post_receive_srq(priv, i)) { 1422 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1423 "failed for buf %d\n", i); 1424 ipoib_cm_dev_cleanup(priv); 1425 return -EIO; 1426 } 1427 } 1428 } 1429 1430 IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC; 1431 return 0; 1432 } 1433 1434 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv) 1435 { 1436 int ret; 1437 1438 if (!priv->cm.srq) 1439 return; 1440 1441 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1442 1443 ret = ib_destroy_srq(priv->cm.srq); 1444 if (ret) 1445 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1446 1447 priv->cm.srq = NULL; 1448 if (!priv->cm.srq_ring) 1449 return; 1450 1451 ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring); 1452 priv->cm.srq_ring = NULL; 1453 1454 mtx_destroy(&priv->cm.mb_queue.ifq_mtx); 1455 } 1456 1457 #endif /* CONFIG_INFINIBAND_IPOIB_CM */ 1458