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sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_cm.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2006 Mellanox Technologies. All rights reserved 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * 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 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "ipoib.h" 39 40 #ifdef CONFIG_INFINIBAND_IPOIB_CM 41 42 #include <netinet/ip.h> 43 #include <netinet/ip_icmp.h> 44 #include <netinet/icmp6.h> 45 46 #include <rdma/ib_cm.h> 47 #include <rdma/ib_cache.h> 48 #include <linux/delay.h> 49 50 int ipoib_max_conn_qp = 128; 51 52 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 53 MODULE_PARM_DESC(max_nonsrq_conn_qp, 54 "Max number of connected-mode QPs per interface " 55 "(applied only if shared receive queue is not available)"); 56 57 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 58 static int data_debug_level; 59 60 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 61 MODULE_PARM_DESC(cm_data_debug_level, 62 "Enable data path debug tracing for connected mode if > 0"); 63 #endif 64 65 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 66 67 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 68 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 69 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 70 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 71 72 static struct ib_qp_attr ipoib_cm_err_attr = { 73 .qp_state = IB_QPS_ERR 74 }; 75 76 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 77 78 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 79 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 80 .opcode = IB_WR_SEND, 81 }; 82 83 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 84 struct ib_cm_event *event); 85 86 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 87 { 88 89 ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req); 90 91 } 92 93 static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id) 94 { 95 const struct ib_recv_wr *bad_wr; 96 struct ipoib_rx_buf *rx_req; 97 struct mbuf *m; 98 int ret; 99 int i; 100 101 rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id]; 102 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 103 priv->cm.rx_sge[i].addr = rx_req->mapping[i]; 104 priv->cm.rx_sge[i].length = m->m_len; 105 } 106 107 priv->cm.rx_wr.num_sge = i; 108 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 109 110 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 111 if (unlikely(ret)) { 112 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 113 ipoib_dma_unmap_rx(priv, rx_req); 114 m_freem(priv->cm.srq_ring[id].mb); 115 priv->cm.srq_ring[id].mb = NULL; 116 } 117 118 return ret; 119 } 120 121 static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv, 122 struct ipoib_cm_rx *rx, 123 struct ib_recv_wr *wr, 124 struct ib_sge *sge, int id) 125 { 126 struct ipoib_rx_buf *rx_req; 127 const struct ib_recv_wr *bad_wr; 128 struct mbuf *m; 129 int ret; 130 int i; 131 132 rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id]; 133 for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) { 134 sge[i].addr = rx_req->mapping[i]; 135 sge[i].length = m->m_len; 136 } 137 138 wr->num_sge = i; 139 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 140 141 ret = ib_post_recv(rx->qp, wr, &bad_wr); 142 if (unlikely(ret)) { 143 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 144 ipoib_dma_unmap_rx(priv, rx_req); 145 m_freem(rx->rx_ring[id].mb); 146 rx->rx_ring[id].mb = NULL; 147 } 148 149 return ret; 150 } 151 152 static struct mbuf * 153 ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req) 154 { 155 return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req, 156 sizeof(struct ipoib_pseudoheader), priv->cm.max_cm_mtu, IPOIB_CM_RX_SG); 157 } 158 159 static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv, 160 struct ipoib_cm_rx_buf *rx_ring) 161 { 162 int i; 163 164 for (i = 0; i < ipoib_recvq_size; ++i) 165 if (rx_ring[i].mb) { 166 ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]); 167 m_freem(rx_ring[i].mb); 168 } 169 170 kfree(rx_ring); 171 } 172 173 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 174 { 175 const struct ib_send_wr *bad_wr; 176 struct ipoib_cm_rx *p; 177 178 /* We only reserved 1 extra slot in CQ for drain WRs, so 179 * make sure we have at most 1 outstanding WR. */ 180 if (list_empty(&priv->cm.rx_flush_list) || 181 !list_empty(&priv->cm.rx_drain_list)) 182 return; 183 184 /* 185 * QPs on flush list are error state. This way, a "flush 186 * error" WC will be immediately generated for each WR we post. 187 */ 188 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 189 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 190 ipoib_warn(priv, "failed to post drain wr\n"); 191 192 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 193 } 194 195 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 196 { 197 struct ipoib_cm_rx *p = ctx; 198 struct ipoib_dev_priv *priv = p->priv; 199 unsigned long flags; 200 201 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 202 return; 203 204 spin_lock_irqsave(&priv->lock, flags); 205 list_move(&p->list, &priv->cm.rx_flush_list); 206 p->state = IPOIB_CM_RX_FLUSH; 207 ipoib_cm_start_rx_drain(priv); 208 spin_unlock_irqrestore(&priv->lock, flags); 209 } 210 211 static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv, 212 struct ipoib_cm_rx *p) 213 { 214 struct ib_qp_init_attr attr = { 215 .event_handler = ipoib_cm_rx_event_handler, 216 .send_cq = priv->recv_cq, /* For drain WR */ 217 .recv_cq = priv->recv_cq, 218 .srq = priv->cm.srq, 219 .cap.max_send_wr = 1, /* For drain WR */ 220 .cap.max_send_sge = 1, 221 .sq_sig_type = IB_SIGNAL_ALL_WR, 222 .qp_type = IB_QPT_RC, 223 .qp_context = p, 224 }; 225 226 if (!ipoib_cm_has_srq(priv)) { 227 attr.cap.max_recv_wr = ipoib_recvq_size; 228 attr.cap.max_recv_sge = priv->cm.num_frags; 229 } 230 231 return ib_create_qp(priv->pd, &attr); 232 } 233 234 static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv, 235 struct ib_cm_id *cm_id, struct ib_qp *qp, 236 unsigned psn) 237 { 238 struct ib_qp_attr qp_attr; 239 int qp_attr_mask, ret; 240 241 qp_attr.qp_state = IB_QPS_INIT; 242 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 243 if (ret) { 244 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 245 return ret; 246 } 247 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 248 if (ret) { 249 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 250 return ret; 251 } 252 qp_attr.qp_state = IB_QPS_RTR; 253 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 254 if (ret) { 255 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 256 return ret; 257 } 258 qp_attr.rq_psn = psn; 259 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 260 if (ret) { 261 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 262 return ret; 263 } 264 265 /* 266 * Current Mellanox HCA firmware won't generate completions 267 * with error for drain WRs unless the QP has been moved to 268 * RTS first. This work-around leaves a window where a QP has 269 * moved to error asynchronously, but this will eventually get 270 * fixed in firmware, so let's not error out if modify QP 271 * fails. 272 */ 273 qp_attr.qp_state = IB_QPS_RTS; 274 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 275 if (ret) { 276 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 277 return 0; 278 } 279 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 280 if (ret) { 281 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 282 return 0; 283 } 284 285 return 0; 286 } 287 288 static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv, 289 struct ib_recv_wr *wr, 290 struct ib_sge *sge) 291 { 292 int i; 293 294 for (i = 0; i < IPOIB_CM_RX_SG; i++) 295 sge[i].lkey = priv->pd->local_dma_lkey; 296 297 wr->next = NULL; 298 wr->sg_list = sge; 299 wr->num_sge = 1; 300 } 301 302 static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv, 303 struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx) 304 { 305 struct { 306 struct ib_recv_wr wr; 307 struct ib_sge sge[IPOIB_CM_RX_SG]; 308 } *t; 309 int ret; 310 int i; 311 312 rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL); 313 if (!rx->rx_ring) { 314 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 315 priv->ca->name, ipoib_recvq_size); 316 return -ENOMEM; 317 } 318 319 memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring); 320 321 t = kmalloc(sizeof *t, GFP_KERNEL); 322 if (!t) { 323 ret = -ENOMEM; 324 goto err_free; 325 } 326 327 ipoib_cm_init_rx_wr(priv, &t->wr, t->sge); 328 329 spin_lock_irq(&priv->lock); 330 331 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 332 spin_unlock_irq(&priv->lock); 333 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 334 ret = -EINVAL; 335 goto err_free; 336 } else 337 ++priv->cm.nonsrq_conn_qp; 338 339 spin_unlock_irq(&priv->lock); 340 341 for (i = 0; i < ipoib_recvq_size; ++i) { 342 if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) { 343 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 344 ret = -ENOMEM; 345 goto err_count; 346 } 347 ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i); 348 if (ret) { 349 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 350 "failed for buf %d\n", i); 351 ret = -EIO; 352 goto err_count; 353 } 354 } 355 356 rx->recv_count = ipoib_recvq_size; 357 358 kfree(t); 359 360 return 0; 361 362 err_count: 363 spin_lock_irq(&priv->lock); 364 --priv->cm.nonsrq_conn_qp; 365 spin_unlock_irq(&priv->lock); 366 367 err_free: 368 kfree(t); 369 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 370 371 return ret; 372 } 373 374 static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id, 375 struct ib_qp *qp, struct ib_cm_req_event_param *req, 376 unsigned psn) 377 { 378 struct ipoib_cm_data data = {}; 379 struct ib_cm_rep_param rep = {}; 380 381 data.qpn = cpu_to_be32(priv->qp->qp_num); 382 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 383 384 rep.private_data = &data; 385 rep.private_data_len = sizeof data; 386 rep.flow_control = 0; 387 rep.rnr_retry_count = req->rnr_retry_count; 388 rep.srq = ipoib_cm_has_srq(priv); 389 rep.qp_num = qp->qp_num; 390 rep.starting_psn = psn; 391 return ib_send_cm_rep(cm_id, &rep); 392 } 393 394 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 395 { 396 struct ipoib_dev_priv *priv = cm_id->context; 397 struct ipoib_cm_rx *p; 398 unsigned psn; 399 int ret; 400 401 ipoib_dbg(priv, "REQ arrived\n"); 402 p = kzalloc(sizeof *p, GFP_KERNEL); 403 if (!p) 404 return -ENOMEM; 405 p->priv = priv; 406 p->id = cm_id; 407 cm_id->context = p; 408 p->state = IPOIB_CM_RX_LIVE; 409 p->jiffies = jiffies; 410 INIT_LIST_HEAD(&p->list); 411 412 p->qp = ipoib_cm_create_rx_qp(priv, p); 413 if (IS_ERR(p->qp)) { 414 ret = PTR_ERR(p->qp); 415 goto err_qp; 416 } 417 418 psn = random() & 0xffffff; 419 ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn); 420 if (ret) 421 goto err_modify; 422 423 if (!ipoib_cm_has_srq(priv)) { 424 ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p); 425 if (ret) 426 goto err_modify; 427 } 428 429 spin_lock_irq(&priv->lock); 430 queue_delayed_work(ipoib_workqueue, 431 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 432 /* Add this entry to passive ids list head, but do not re-add it 433 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 434 p->jiffies = jiffies; 435 if (p->state == IPOIB_CM_RX_LIVE) 436 list_move(&p->list, &priv->cm.passive_ids); 437 spin_unlock_irq(&priv->lock); 438 439 ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn); 440 if (ret) { 441 ipoib_warn(priv, "failed to send REP: %d\n", ret); 442 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 443 ipoib_warn(priv, "unable to move qp to error state\n"); 444 } 445 return 0; 446 447 err_modify: 448 ib_destroy_qp(p->qp); 449 err_qp: 450 kfree(p); 451 return ret; 452 } 453 454 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 455 struct ib_cm_event *event) 456 { 457 struct ipoib_cm_rx *p; 458 struct ipoib_dev_priv *priv; 459 460 switch (event->event) { 461 case IB_CM_REQ_RECEIVED: 462 return ipoib_cm_req_handler(cm_id, event); 463 case IB_CM_DREQ_RECEIVED: 464 p = cm_id->context; 465 ib_send_cm_drep(cm_id, NULL, 0); 466 /* Fall through */ 467 case IB_CM_REJ_RECEIVED: 468 p = cm_id->context; 469 priv = p->priv; 470 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 471 ipoib_warn(priv, "unable to move qp to error state\n"); 472 /* Fall through */ 473 default: 474 return 0; 475 } 476 } 477 478 void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 479 { 480 struct ipoib_cm_rx_buf saverx; 481 struct ipoib_cm_rx_buf *rx_ring; 482 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 483 struct ifnet *dev = priv->dev; 484 struct mbuf *mb, *newmb; 485 struct ipoib_cm_rx *p; 486 int has_srq; 487 488 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 489 wr_id, wc->status); 490 491 if (unlikely(wr_id >= ipoib_recvq_size)) { 492 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 493 spin_lock(&priv->lock); 494 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 495 ipoib_cm_start_rx_drain(priv); 496 if (priv->cm.id != NULL) 497 queue_work(ipoib_workqueue, 498 &priv->cm.rx_reap_task); 499 spin_unlock(&priv->lock); 500 } else 501 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 502 wr_id, ipoib_recvq_size); 503 goto done; 504 } 505 506 p = wc->qp->qp_context; 507 508 has_srq = ipoib_cm_has_srq(priv); 509 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 510 511 mb = rx_ring[wr_id].mb; 512 513 if (unlikely(wc->status != IB_WC_SUCCESS)) { 514 ipoib_dbg(priv, "cm recv error " 515 "(status=%d, wrid=%d vend_err %x)\n", 516 wc->status, wr_id, wc->vendor_err); 517 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 518 if (has_srq) 519 goto repost; 520 else { 521 if (!--p->recv_count) { 522 spin_lock(&priv->lock); 523 list_move(&p->list, &priv->cm.rx_reap_list); 524 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 525 spin_unlock(&priv->lock); 526 } 527 goto done; 528 } 529 } 530 531 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 532 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 533 p->jiffies = jiffies; 534 /* Move this entry to list head, but do not re-add it 535 * if it has been moved out of list. */ 536 if (p->state == IPOIB_CM_RX_LIVE) 537 list_move(&p->list, &priv->cm.passive_ids); 538 } 539 } 540 541 memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx)); 542 newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]); 543 if (unlikely(!newmb)) { 544 /* 545 * If we can't allocate a new RX buffer, dump 546 * this packet and reuse the old buffer. 547 */ 548 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 549 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 550 memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx)); 551 goto repost; 552 } 553 554 ipoib_cm_dma_unmap_rx(priv, &saverx); 555 556 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 557 wc->byte_len, wc->slid); 558 559 ipoib_dma_mb(priv, mb, wc->byte_len); 560 561 mb->m_pkthdr.rcvif = dev; 562 563 M_PREPEND(mb, sizeof(struct ipoib_pseudoheader), M_NOWAIT); 564 if (likely(mb != NULL)) { 565 struct ipoib_header *ibh; 566 567 if_inc_counter(dev, IFCOUNTER_IPACKETS, 1); 568 if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len); 569 570 /* fixup destination infiniband address */ 571 ibh = mtod(mb, struct ipoib_header *); 572 memset(ibh->hwaddr, 0, 4); 573 memcpy(ibh->hwaddr + 4, priv->local_gid.raw, sizeof(union ib_gid)); 574 575 dev->if_input(dev, mb); 576 } else { 577 if_inc_counter(dev, IFCOUNTER_IERRORS, 1); 578 } 579 repost: 580 if (has_srq) { 581 if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id))) 582 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 583 "for buf %d\n", wr_id); 584 } else { 585 if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p, 586 &priv->cm.rx_wr, 587 priv->cm.rx_sge, 588 wr_id))) { 589 --p->recv_count; 590 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 591 "for buf %d\n", wr_id); 592 } 593 } 594 done: 595 return; 596 } 597 598 static inline int post_send(struct ipoib_dev_priv *priv, 599 struct ipoib_cm_tx *tx, 600 struct ipoib_cm_tx_buf *tx_req, 601 unsigned int wr_id) 602 { 603 const struct ib_send_wr *bad_wr; 604 struct mbuf *mb = tx_req->mb; 605 u64 *mapping = tx_req->mapping; 606 struct mbuf *m; 607 int i; 608 609 for (m = mb, i = 0; m != NULL; m = m->m_next, i++) { 610 priv->tx_sge[i].addr = mapping[i]; 611 priv->tx_sge[i].length = m->m_len; 612 } 613 priv->tx_wr.wr.num_sge = i; 614 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 615 priv->tx_wr.wr.opcode = IB_WR_SEND; 616 617 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 618 } 619 620 void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx) 621 { 622 struct ipoib_cm_tx_buf *tx_req; 623 struct ifnet *dev = priv->dev; 624 625 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) { 626 while (ipoib_poll_tx(priv, false)) 627 ; /* nothing */ 628 } 629 630 m_adj(mb, sizeof(struct ipoib_pseudoheader)); 631 if (unlikely(mb->m_pkthdr.len > tx->mtu)) { 632 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 633 mb->m_pkthdr.len, tx->mtu); 634 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 635 ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu)); 636 return; 637 } 638 639 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 640 tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num); 641 642 643 /* 644 * We put the mb into the tx_ring _before_ we call post_send() 645 * because it's entirely possible that the completion handler will 646 * run before we execute anything after the post_send(). That 647 * means we have to make sure everything is properly recorded and 648 * our state is consistent before we call post_send(). 649 */ 650 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 651 tx_req->mb = mb; 652 if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req, 653 priv->cm.num_frags))) { 654 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 655 if (tx_req->mb) 656 m_freem(tx_req->mb); 657 return; 658 } 659 660 if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) { 661 ipoib_warn(priv, "post_send failed\n"); 662 if_inc_counter(dev, IFCOUNTER_OERRORS, 1); 663 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 664 m_freem(mb); 665 } else { 666 ++tx->tx_head; 667 668 if (++priv->tx_outstanding == ipoib_sendq_size) { 669 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 670 tx->qp->qp_num); 671 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 672 ipoib_warn(priv, "request notify on send CQ failed\n"); 673 dev->if_drv_flags |= IFF_DRV_OACTIVE; 674 } 675 } 676 677 } 678 679 void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc) 680 { 681 struct ipoib_cm_tx *tx = wc->qp->qp_context; 682 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 683 struct ifnet *dev = priv->dev; 684 struct ipoib_cm_tx_buf *tx_req; 685 686 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 687 wr_id, wc->status); 688 689 if (unlikely(wr_id >= ipoib_sendq_size)) { 690 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 691 wr_id, ipoib_sendq_size); 692 return; 693 } 694 695 tx_req = &tx->tx_ring[wr_id]; 696 697 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 698 699 /* FIXME: is this right? Shouldn't we only increment on success? */ 700 if_inc_counter(dev, IFCOUNTER_OPACKETS, 1); 701 702 m_freem(tx_req->mb); 703 704 ++tx->tx_tail; 705 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 706 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 707 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 708 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 709 710 if (wc->status != IB_WC_SUCCESS && 711 wc->status != IB_WC_WR_FLUSH_ERR) { 712 struct ipoib_path *path; 713 714 ipoib_dbg(priv, "failed cm send event " 715 "(status=%d, wrid=%d vend_err %x)\n", 716 wc->status, wr_id, wc->vendor_err); 717 718 path = tx->path; 719 720 if (path) { 721 path->cm = NULL; 722 rb_erase(&path->rb_node, &priv->path_tree); 723 list_del(&path->list); 724 } 725 726 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 727 list_move(&tx->list, &priv->cm.reap_list); 728 queue_work(ipoib_workqueue, &priv->cm.reap_task); 729 } 730 731 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 732 } 733 734 } 735 736 int ipoib_cm_dev_open(struct ipoib_dev_priv *priv) 737 { 738 int ret; 739 740 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev))) 741 return 0; 742 743 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv); 744 if (IS_ERR(priv->cm.id)) { 745 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 746 ret = PTR_ERR(priv->cm.id); 747 goto err_cm; 748 } 749 750 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 0); 751 if (ret) { 752 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 753 IPOIB_CM_IETF_ID | priv->qp->qp_num); 754 goto err_listen; 755 } 756 757 return 0; 758 759 err_listen: 760 ib_destroy_cm_id(priv->cm.id); 761 err_cm: 762 priv->cm.id = NULL; 763 return ret; 764 } 765 766 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv) 767 { 768 struct ipoib_cm_rx *rx, *n; 769 LIST_HEAD(list); 770 771 spin_lock_irq(&priv->lock); 772 list_splice_init(&priv->cm.rx_reap_list, &list); 773 spin_unlock_irq(&priv->lock); 774 775 list_for_each_entry_safe(rx, n, &list, list) { 776 ib_destroy_cm_id(rx->id); 777 ib_destroy_qp(rx->qp); 778 if (!ipoib_cm_has_srq(priv)) { 779 ipoib_cm_free_rx_ring(priv, rx->rx_ring); 780 spin_lock_irq(&priv->lock); 781 --priv->cm.nonsrq_conn_qp; 782 spin_unlock_irq(&priv->lock); 783 } 784 kfree(rx); 785 } 786 } 787 788 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv) 789 { 790 struct ipoib_cm_rx *p; 791 unsigned long begin; 792 int ret; 793 794 if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id) 795 return; 796 797 ib_destroy_cm_id(priv->cm.id); 798 priv->cm.id = NULL; 799 800 cancel_work_sync(&priv->cm.rx_reap_task); 801 802 spin_lock_irq(&priv->lock); 803 while (!list_empty(&priv->cm.passive_ids)) { 804 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 805 list_move(&p->list, &priv->cm.rx_error_list); 806 p->state = IPOIB_CM_RX_ERROR; 807 spin_unlock_irq(&priv->lock); 808 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 809 if (ret) 810 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 811 spin_lock_irq(&priv->lock); 812 } 813 814 /* Wait for all RX to be drained */ 815 begin = jiffies; 816 817 while (!list_empty(&priv->cm.rx_error_list) || 818 !list_empty(&priv->cm.rx_flush_list) || 819 !list_empty(&priv->cm.rx_drain_list)) { 820 if (time_after(jiffies, begin + 5 * HZ)) { 821 ipoib_warn(priv, "RX drain timing out\n"); 822 823 /* 824 * assume the HW is wedged and just free up everything. 825 */ 826 list_splice_init(&priv->cm.rx_flush_list, 827 &priv->cm.rx_reap_list); 828 list_splice_init(&priv->cm.rx_error_list, 829 &priv->cm.rx_reap_list); 830 list_splice_init(&priv->cm.rx_drain_list, 831 &priv->cm.rx_reap_list); 832 break; 833 } 834 spin_unlock_irq(&priv->lock); 835 msleep(1); 836 ipoib_drain_cq(priv); 837 spin_lock_irq(&priv->lock); 838 } 839 840 spin_unlock_irq(&priv->lock); 841 842 ipoib_cm_free_rx_reap_list(priv); 843 844 cancel_delayed_work_sync(&priv->cm.stale_task); 845 } 846 847 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 848 { 849 struct ipoib_cm_tx *p = cm_id->context; 850 struct ipoib_dev_priv *priv = p->priv; 851 struct ipoib_cm_data *data = event->private_data; 852 struct epoch_tracker et; 853 struct ifqueue mbqueue; 854 struct ib_qp_attr qp_attr; 855 int qp_attr_mask, ret; 856 struct mbuf *mb; 857 858 ipoib_dbg(priv, "cm rep handler\n"); 859 p->mtu = be32_to_cpu(data->mtu); 860 861 if (p->mtu <= IPOIB_ENCAP_LEN) { 862 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 863 p->mtu, IPOIB_ENCAP_LEN); 864 return -EINVAL; 865 } 866 867 qp_attr.qp_state = IB_QPS_RTR; 868 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 869 if (ret) { 870 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 871 return ret; 872 } 873 874 qp_attr.rq_psn = 0 /* FIXME */; 875 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 876 if (ret) { 877 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 878 return ret; 879 } 880 881 qp_attr.qp_state = IB_QPS_RTS; 882 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 883 if (ret) { 884 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 885 return ret; 886 } 887 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 888 if (ret) { 889 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 890 return ret; 891 } 892 893 bzero(&mbqueue, sizeof(mbqueue)); 894 895 spin_lock_irq(&priv->lock); 896 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 897 if (p->path) 898 for (;;) { 899 _IF_DEQUEUE(&p->path->queue, mb); 900 if (mb == NULL) 901 break; 902 _IF_ENQUEUE(&mbqueue, mb); 903 } 904 spin_unlock_irq(&priv->lock); 905 906 NET_EPOCH_ENTER(et); 907 for (;;) { 908 struct ifnet *dev = p->priv->dev; 909 _IF_DEQUEUE(&mbqueue, mb); 910 if (mb == NULL) 911 break; 912 mb->m_pkthdr.rcvif = dev; 913 if (dev->if_transmit(dev, mb)) 914 ipoib_warn(priv, "dev_queue_xmit failed " 915 "to requeue packet\n"); 916 } 917 NET_EPOCH_EXIT(et); 918 919 ret = ib_send_cm_rtu(cm_id, NULL, 0); 920 if (ret) { 921 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 922 return ret; 923 } 924 return 0; 925 } 926 927 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv, 928 struct ipoib_cm_tx *tx) 929 { 930 struct ib_qp_init_attr attr = { 931 .send_cq = priv->send_cq, 932 .recv_cq = priv->recv_cq, 933 .srq = priv->cm.srq, 934 .cap.max_send_wr = ipoib_sendq_size, 935 .cap.max_send_sge = priv->cm.num_frags, 936 .sq_sig_type = IB_SIGNAL_ALL_WR, 937 .qp_type = IB_QPT_RC, 938 .qp_context = tx 939 }; 940 941 return ib_create_qp(priv->pd, &attr); 942 } 943 944 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv, 945 struct ib_cm_id *id, struct ib_qp *qp, 946 u32 qpn, 947 struct ib_sa_path_rec *pathrec) 948 { 949 struct ipoib_cm_data data = {}; 950 struct ib_cm_req_param req = {}; 951 952 ipoib_dbg(priv, "cm send req\n"); 953 954 data.qpn = cpu_to_be32(priv->qp->qp_num); 955 data.mtu = cpu_to_be32(priv->cm.max_cm_mtu); 956 957 req.primary_path = pathrec; 958 req.alternate_path = NULL; 959 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 960 req.qp_num = qp->qp_num; 961 req.qp_type = qp->qp_type; 962 req.private_data = &data; 963 req.private_data_len = sizeof data; 964 req.flow_control = 0; 965 966 req.starting_psn = 0; /* FIXME */ 967 968 /* 969 * Pick some arbitrary defaults here; we could make these 970 * module parameters if anyone cared about setting them. 971 */ 972 req.responder_resources = 4; 973 req.remote_cm_response_timeout = 20; 974 req.local_cm_response_timeout = 20; 975 req.retry_count = 0; /* RFC draft warns against retries */ 976 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 977 req.max_cm_retries = 15; 978 req.srq = ipoib_cm_has_srq(priv); 979 return ib_send_cm_req(id, &req); 980 } 981 982 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv, 983 struct ib_cm_id *cm_id, struct ib_qp *qp) 984 { 985 struct ib_qp_attr qp_attr; 986 int qp_attr_mask, ret; 987 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 988 if (ret) { 989 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 990 return ret; 991 } 992 993 qp_attr.qp_state = IB_QPS_INIT; 994 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 995 qp_attr.port_num = priv->port; 996 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 997 998 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 999 if (ret) { 1000 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1001 return ret; 1002 } 1003 return 0; 1004 } 1005 1006 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1007 struct ib_sa_path_rec *pathrec) 1008 { 1009 struct ipoib_dev_priv *priv = p->priv; 1010 int ret; 1011 1012 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL); 1013 if (!p->tx_ring) { 1014 ipoib_warn(priv, "failed to allocate tx ring\n"); 1015 ret = -ENOMEM; 1016 goto err_tx; 1017 } 1018 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1019 1020 p->qp = ipoib_cm_create_tx_qp(p->priv, p); 1021 if (IS_ERR(p->qp)) { 1022 ret = PTR_ERR(p->qp); 1023 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1024 goto err_qp; 1025 } 1026 1027 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1028 if (IS_ERR(p->id)) { 1029 ret = PTR_ERR(p->id); 1030 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1031 goto err_id; 1032 } 1033 1034 ret = ipoib_cm_modify_tx_init(p->priv, p->id, p->qp); 1035 if (ret) { 1036 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1037 goto err_modify; 1038 } 1039 1040 ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec); 1041 if (ret) { 1042 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1043 goto err_send_cm; 1044 } 1045 1046 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1047 p->qp->qp_num, pathrec->dgid.raw, qpn); 1048 1049 return 0; 1050 1051 err_send_cm: 1052 err_modify: 1053 ib_destroy_cm_id(p->id); 1054 err_id: 1055 p->id = NULL; 1056 ib_destroy_qp(p->qp); 1057 err_qp: 1058 p->qp = NULL; 1059 kfree(p->tx_ring); 1060 err_tx: 1061 return ret; 1062 } 1063 1064 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1065 { 1066 struct ipoib_dev_priv *priv = p->priv; 1067 struct ifnet *dev = priv->dev; 1068 struct ipoib_cm_tx_buf *tx_req; 1069 unsigned long begin; 1070 1071 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1072 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1073 1074 if (p->path) 1075 ipoib_path_free(priv, p->path); 1076 1077 if (p->id) 1078 ib_destroy_cm_id(p->id); 1079 1080 if (p->tx_ring) { 1081 /* Wait for all sends to complete */ 1082 begin = jiffies; 1083 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1084 if (time_after(jiffies, begin + 5 * HZ)) { 1085 ipoib_warn(priv, "timing out; %d sends not completed\n", 1086 p->tx_head - p->tx_tail); 1087 goto timeout; 1088 } 1089 1090 msleep(1); 1091 } 1092 } 1093 1094 timeout: 1095 1096 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1097 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1098 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req); 1099 m_freem(tx_req->mb); 1100 ++p->tx_tail; 1101 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1102 (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 && 1103 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1104 dev->if_drv_flags &= ~IFF_DRV_OACTIVE; 1105 } 1106 1107 if (p->qp) 1108 ib_destroy_qp(p->qp); 1109 1110 kfree(p->tx_ring); 1111 kfree(p); 1112 } 1113 1114 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1115 struct ib_cm_event *event) 1116 { 1117 struct ipoib_cm_tx *tx = cm_id->context; 1118 struct ipoib_dev_priv *priv = tx->priv; 1119 struct ipoib_path *path; 1120 unsigned long flags; 1121 int ret; 1122 1123 switch (event->event) { 1124 case IB_CM_DREQ_RECEIVED: 1125 ipoib_dbg(priv, "DREQ received.\n"); 1126 ib_send_cm_drep(cm_id, NULL, 0); 1127 break; 1128 case IB_CM_REP_RECEIVED: 1129 ipoib_dbg(priv, "REP received.\n"); 1130 ret = ipoib_cm_rep_handler(cm_id, event); 1131 if (ret) 1132 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1133 NULL, 0, NULL, 0); 1134 break; 1135 case IB_CM_REQ_ERROR: 1136 case IB_CM_REJ_RECEIVED: 1137 case IB_CM_TIMEWAIT_EXIT: 1138 ipoib_dbg(priv, "CM error %d.\n", event->event); 1139 spin_lock_irqsave(&priv->lock, flags); 1140 path = tx->path; 1141 1142 if (path) { 1143 path->cm = NULL; 1144 tx->path = NULL; 1145 rb_erase(&path->rb_node, &priv->path_tree); 1146 list_del(&path->list); 1147 } 1148 1149 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1150 list_move(&tx->list, &priv->cm.reap_list); 1151 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1152 } 1153 1154 spin_unlock_irqrestore(&priv->lock, flags); 1155 if (path) 1156 ipoib_path_free(tx->priv, path); 1157 break; 1158 default: 1159 break; 1160 } 1161 1162 return 0; 1163 } 1164 1165 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv, 1166 struct ipoib_path *path) 1167 { 1168 struct ipoib_cm_tx *tx; 1169 1170 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1171 if (!tx) 1172 return NULL; 1173 1174 ipoib_dbg(priv, "Creating cm tx\n"); 1175 path->cm = tx; 1176 tx->path = path; 1177 tx->priv = priv; 1178 list_add(&tx->list, &priv->cm.start_list); 1179 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1180 queue_work(ipoib_workqueue, &priv->cm.start_task); 1181 return tx; 1182 } 1183 1184 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1185 { 1186 struct ipoib_dev_priv *priv = tx->priv; 1187 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1188 spin_lock(&priv->lock); 1189 list_move(&tx->list, &priv->cm.reap_list); 1190 spin_unlock(&priv->lock); 1191 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1192 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1193 tx->path->pathrec.dgid.raw); 1194 tx->path = NULL; 1195 } 1196 } 1197 1198 static void ipoib_cm_tx_start(struct work_struct *work) 1199 { 1200 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1201 cm.start_task); 1202 struct ipoib_path *path; 1203 struct ipoib_cm_tx *p; 1204 unsigned long flags; 1205 int ret; 1206 1207 struct ib_sa_path_rec pathrec; 1208 u32 qpn; 1209 1210 ipoib_dbg(priv, "cm start task\n"); 1211 spin_lock_irqsave(&priv->lock, flags); 1212 1213 while (!list_empty(&priv->cm.start_list)) { 1214 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1215 list_del_init(&p->list); 1216 path = p->path; 1217 qpn = IPOIB_QPN(path->hwaddr); 1218 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1219 1220 spin_unlock_irqrestore(&priv->lock, flags); 1221 1222 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1223 1224 spin_lock_irqsave(&priv->lock, flags); 1225 1226 if (ret) { 1227 path = p->path; 1228 if (path) { 1229 path->cm = NULL; 1230 rb_erase(&path->rb_node, &priv->path_tree); 1231 list_del(&path->list); 1232 ipoib_path_free(priv, path); 1233 } 1234 list_del(&p->list); 1235 kfree(p); 1236 } 1237 } 1238 1239 spin_unlock_irqrestore(&priv->lock, flags); 1240 } 1241 1242 static void ipoib_cm_tx_reap(struct work_struct *work) 1243 { 1244 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1245 cm.reap_task); 1246 struct ipoib_cm_tx *p; 1247 unsigned long flags; 1248 1249 spin_lock_irqsave(&priv->lock, flags); 1250 1251 while (!list_empty(&priv->cm.reap_list)) { 1252 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1253 list_del(&p->list); 1254 spin_unlock_irqrestore(&priv->lock, flags); 1255 ipoib_cm_tx_destroy(p); 1256 spin_lock_irqsave(&priv->lock, flags); 1257 } 1258 1259 spin_unlock_irqrestore(&priv->lock, flags); 1260 } 1261 1262 static void ipoib_cm_mb_reap(struct work_struct *work) 1263 { 1264 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1265 cm.mb_task); 1266 struct mbuf *mb; 1267 unsigned long flags; 1268 #if defined(INET) || defined(INET6) 1269 unsigned mtu = priv->mcast_mtu; 1270 #endif 1271 uint16_t proto; 1272 1273 spin_lock_irqsave(&priv->lock, flags); 1274 1275 CURVNET_SET_QUIET(priv->dev->if_vnet); 1276 1277 for (;;) { 1278 IF_DEQUEUE(&priv->cm.mb_queue, mb); 1279 if (mb == NULL) 1280 break; 1281 spin_unlock_irqrestore(&priv->lock, flags); 1282 1283 proto = htons(*mtod(mb, uint16_t *)); 1284 m_adj(mb, IPOIB_ENCAP_LEN); 1285 switch (proto) { 1286 #if defined(INET) 1287 case ETHERTYPE_IP: 1288 icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu); 1289 break; 1290 #endif 1291 #if defined(INET6) 1292 case ETHERTYPE_IPV6: 1293 icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu); 1294 break; 1295 #endif 1296 default: 1297 m_freem(mb); 1298 } 1299 1300 spin_lock_irqsave(&priv->lock, flags); 1301 } 1302 1303 CURVNET_RESTORE(); 1304 1305 spin_unlock_irqrestore(&priv->lock, flags); 1306 } 1307 1308 void 1309 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu) 1310 { 1311 int e = priv->cm.mb_queue.ifq_len; 1312 1313 IF_ENQUEUE(&priv->cm.mb_queue, mb); 1314 if (e == 0) 1315 queue_work(ipoib_workqueue, &priv->cm.mb_task); 1316 } 1317 1318 static void ipoib_cm_rx_reap(struct work_struct *work) 1319 { 1320 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1321 cm.rx_reap_task)); 1322 } 1323 1324 static void ipoib_cm_stale_task(struct work_struct *work) 1325 { 1326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1327 cm.stale_task.work); 1328 struct ipoib_cm_rx *p; 1329 int ret; 1330 1331 spin_lock_irq(&priv->lock); 1332 while (!list_empty(&priv->cm.passive_ids)) { 1333 /* List is sorted by LRU, start from tail, 1334 * stop when we see a recently used entry */ 1335 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1336 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1337 break; 1338 list_move(&p->list, &priv->cm.rx_error_list); 1339 p->state = IPOIB_CM_RX_ERROR; 1340 spin_unlock_irq(&priv->lock); 1341 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1342 if (ret) 1343 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1344 spin_lock_irq(&priv->lock); 1345 } 1346 1347 if (!list_empty(&priv->cm.passive_ids)) 1348 queue_delayed_work(ipoib_workqueue, 1349 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1350 spin_unlock_irq(&priv->lock); 1351 } 1352 1353 1354 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge) 1355 { 1356 struct ib_srq_init_attr srq_init_attr = { 1357 .attr = { 1358 .max_wr = ipoib_recvq_size, 1359 .max_sge = max_sge 1360 } 1361 }; 1362 1363 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1364 if (IS_ERR(priv->cm.srq)) { 1365 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1366 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1367 priv->ca->name, PTR_ERR(priv->cm.srq)); 1368 priv->cm.srq = NULL; 1369 return; 1370 } 1371 1372 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL); 1373 if (!priv->cm.srq_ring) { 1374 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1375 priv->ca->name, ipoib_recvq_size); 1376 ib_destroy_srq(priv->cm.srq); 1377 priv->cm.srq = NULL; 1378 return; 1379 } 1380 1381 memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1382 } 1383 1384 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv) 1385 { 1386 struct ifnet *dev = priv->dev; 1387 int i; 1388 int max_srq_sge; 1389 1390 INIT_LIST_HEAD(&priv->cm.passive_ids); 1391 INIT_LIST_HEAD(&priv->cm.reap_list); 1392 INIT_LIST_HEAD(&priv->cm.start_list); 1393 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1394 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1395 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1396 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1397 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1398 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1399 INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap); 1400 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1401 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1402 1403 bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue)); 1404 mtx_init(&priv->cm.mb_queue.ifq_mtx, 1405 dev->if_xname, "if send queue", MTX_DEF); 1406 1407 max_srq_sge = priv->ca->attrs.max_srq_sge; 1408 1409 ipoib_dbg(priv, "max_srq_sge=%d\n", max_srq_sge); 1410 1411 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, max_srq_sge); 1412 ipoib_cm_create_srq(priv, max_srq_sge); 1413 if (ipoib_cm_has_srq(priv)) { 1414 priv->cm.max_cm_mtu = max_srq_sge * MJUMPAGESIZE; 1415 priv->cm.num_frags = max_srq_sge; 1416 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1417 priv->cm.max_cm_mtu, priv->cm.num_frags); 1418 } else { 1419 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU; 1420 priv->cm.num_frags = IPOIB_CM_RX_SG; 1421 } 1422 1423 ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge); 1424 1425 if (ipoib_cm_has_srq(priv)) { 1426 for (i = 0; i < ipoib_recvq_size; ++i) { 1427 if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) { 1428 ipoib_warn(priv, "failed to allocate " 1429 "receive buffer %d\n", i); 1430 ipoib_cm_dev_cleanup(priv); 1431 return -ENOMEM; 1432 } 1433 1434 if (ipoib_cm_post_receive_srq(priv, i)) { 1435 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1436 "failed for buf %d\n", i); 1437 ipoib_cm_dev_cleanup(priv); 1438 return -EIO; 1439 } 1440 } 1441 } 1442 1443 IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC; 1444 return 0; 1445 } 1446 1447 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv) 1448 { 1449 int ret; 1450 1451 if (!priv->cm.srq) 1452 return; 1453 1454 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1455 1456 ret = ib_destroy_srq(priv->cm.srq); 1457 if (ret) 1458 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1459 1460 priv->cm.srq = NULL; 1461 if (!priv->cm.srq_ring) 1462 return; 1463 1464 ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring); 1465 priv->cm.srq_ring = NULL; 1466 1467 mtx_destroy(&priv->cm.mb_queue.ifq_mtx); 1468 } 1469 1470 #endif /* CONFIG_INFINIBAND_IPOIB_CM */
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