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 <rdma/ib_cm.h> 34 #include <net/dst.h> 35 #include <net/icmp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/delay.h> 38 #include <linux/slab.h> 39 #include <linux/vmalloc.h> 40 41 #include "ipoib.h" 42 43 int ipoib_max_conn_qp = 128; 44 45 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 46 MODULE_PARM_DESC(max_nonsrq_conn_qp, 47 "Max number of connected-mode QPs per interface " 48 "(applied only if shared receive queue is not available)"); 49 50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 51 static int data_debug_level; 52 53 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 54 MODULE_PARM_DESC(cm_data_debug_level, 55 "Enable data path debug tracing for connected mode if > 0"); 56 #endif 57 58 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 59 60 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 61 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 62 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 63 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 64 65 static struct ib_qp_attr ipoib_cm_err_attr = { 66 .qp_state = IB_QPS_ERR 67 }; 68 69 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 70 71 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 72 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 73 .opcode = IB_WR_SEND, 74 }; 75 76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 77 struct ib_cm_event *event); 78 79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 80 u64 mapping[IPOIB_CM_RX_SG]) 81 { 82 int i; 83 84 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 85 86 for (i = 0; i < frags; ++i) 87 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 88 } 89 90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 91 { 92 struct ipoib_dev_priv *priv = netdev_priv(dev); 93 struct ib_recv_wr *bad_wr; 94 int i, ret; 95 96 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 97 98 for (i = 0; i < priv->cm.num_frags; ++i) 99 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 100 101 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 102 if (unlikely(ret)) { 103 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 104 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 105 priv->cm.srq_ring[id].mapping); 106 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 107 priv->cm.srq_ring[id].skb = NULL; 108 } 109 110 return ret; 111 } 112 113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 114 struct ipoib_cm_rx *rx, 115 struct ib_recv_wr *wr, 116 struct ib_sge *sge, int id) 117 { 118 struct ipoib_dev_priv *priv = netdev_priv(dev); 119 struct ib_recv_wr *bad_wr; 120 int i, ret; 121 122 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 123 124 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 125 sge[i].addr = rx->rx_ring[id].mapping[i]; 126 127 ret = ib_post_recv(rx->qp, wr, &bad_wr); 128 if (unlikely(ret)) { 129 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 130 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 131 rx->rx_ring[id].mapping); 132 dev_kfree_skb_any(rx->rx_ring[id].skb); 133 rx->rx_ring[id].skb = NULL; 134 } 135 136 return ret; 137 } 138 139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 140 struct ipoib_cm_rx_buf *rx_ring, 141 int id, int frags, 142 u64 mapping[IPOIB_CM_RX_SG]) 143 { 144 struct ipoib_dev_priv *priv = netdev_priv(dev); 145 struct sk_buff *skb; 146 int i; 147 148 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 149 if (unlikely(!skb)) 150 return NULL; 151 152 /* 153 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 154 * IP header to a multiple of 16. 155 */ 156 skb_reserve(skb, 12); 157 158 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 159 DMA_FROM_DEVICE); 160 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 161 dev_kfree_skb_any(skb); 162 return NULL; 163 } 164 165 for (i = 0; i < frags; i++) { 166 struct page *page = alloc_page(GFP_ATOMIC); 167 168 if (!page) 169 goto partial_error; 170 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 171 172 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, 173 0, PAGE_SIZE, DMA_FROM_DEVICE); 174 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 175 goto partial_error; 176 } 177 178 rx_ring[id].skb = skb; 179 return skb; 180 181 partial_error: 182 183 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 184 185 for (; i > 0; --i) 186 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 187 188 dev_kfree_skb_any(skb); 189 return NULL; 190 } 191 192 static void ipoib_cm_free_rx_ring(struct net_device *dev, 193 struct ipoib_cm_rx_buf *rx_ring) 194 { 195 struct ipoib_dev_priv *priv = netdev_priv(dev); 196 int i; 197 198 for (i = 0; i < ipoib_recvq_size; ++i) 199 if (rx_ring[i].skb) { 200 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 201 rx_ring[i].mapping); 202 dev_kfree_skb_any(rx_ring[i].skb); 203 } 204 205 vfree(rx_ring); 206 } 207 208 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 209 { 210 struct ib_send_wr *bad_wr; 211 struct ipoib_cm_rx *p; 212 213 /* We only reserved 1 extra slot in CQ for drain WRs, so 214 * make sure we have at most 1 outstanding WR. */ 215 if (list_empty(&priv->cm.rx_flush_list) || 216 !list_empty(&priv->cm.rx_drain_list)) 217 return; 218 219 /* 220 * QPs on flush list are error state. This way, a "flush 221 * error" WC will be immediately generated for each WR we post. 222 */ 223 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 224 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 225 ipoib_warn(priv, "failed to post drain wr\n"); 226 227 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 228 } 229 230 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 231 { 232 struct ipoib_cm_rx *p = ctx; 233 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 234 unsigned long flags; 235 236 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 237 return; 238 239 spin_lock_irqsave(&priv->lock, flags); 240 list_move(&p->list, &priv->cm.rx_flush_list); 241 p->state = IPOIB_CM_RX_FLUSH; 242 ipoib_cm_start_rx_drain(priv); 243 spin_unlock_irqrestore(&priv->lock, flags); 244 } 245 246 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 247 struct ipoib_cm_rx *p) 248 { 249 struct ipoib_dev_priv *priv = netdev_priv(dev); 250 struct ib_qp_init_attr attr = { 251 .event_handler = ipoib_cm_rx_event_handler, 252 .send_cq = priv->recv_cq, /* For drain WR */ 253 .recv_cq = priv->recv_cq, 254 .srq = priv->cm.srq, 255 .cap.max_send_wr = 1, /* For drain WR */ 256 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 257 .sq_sig_type = IB_SIGNAL_ALL_WR, 258 .qp_type = IB_QPT_RC, 259 .qp_context = p, 260 }; 261 262 if (!ipoib_cm_has_srq(dev)) { 263 attr.cap.max_recv_wr = ipoib_recvq_size; 264 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 265 } 266 267 return ib_create_qp(priv->pd, &attr); 268 } 269 270 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 271 struct ib_cm_id *cm_id, struct ib_qp *qp, 272 unsigned psn) 273 { 274 struct ipoib_dev_priv *priv = netdev_priv(dev); 275 struct ib_qp_attr qp_attr; 276 int qp_attr_mask, ret; 277 278 qp_attr.qp_state = IB_QPS_INIT; 279 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 280 if (ret) { 281 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 282 return ret; 283 } 284 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 285 if (ret) { 286 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 287 return ret; 288 } 289 qp_attr.qp_state = IB_QPS_RTR; 290 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 291 if (ret) { 292 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 293 return ret; 294 } 295 qp_attr.rq_psn = psn; 296 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 297 if (ret) { 298 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 299 return ret; 300 } 301 302 /* 303 * Current Mellanox HCA firmware won't generate completions 304 * with error for drain WRs unless the QP has been moved to 305 * RTS first. This work-around leaves a window where a QP has 306 * moved to error asynchronously, but this will eventually get 307 * fixed in firmware, so let's not error out if modify QP 308 * fails. 309 */ 310 qp_attr.qp_state = IB_QPS_RTS; 311 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 312 if (ret) { 313 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 314 return 0; 315 } 316 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 317 if (ret) { 318 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 319 return 0; 320 } 321 322 return 0; 323 } 324 325 static void ipoib_cm_init_rx_wr(struct net_device *dev, 326 struct ib_recv_wr *wr, 327 struct ib_sge *sge) 328 { 329 struct ipoib_dev_priv *priv = netdev_priv(dev); 330 int i; 331 332 for (i = 0; i < priv->cm.num_frags; ++i) 333 sge[i].lkey = priv->mr->lkey; 334 335 sge[0].length = IPOIB_CM_HEAD_SIZE; 336 for (i = 1; i < priv->cm.num_frags; ++i) 337 sge[i].length = PAGE_SIZE; 338 339 wr->next = NULL; 340 wr->sg_list = sge; 341 wr->num_sge = priv->cm.num_frags; 342 } 343 344 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 345 struct ipoib_cm_rx *rx) 346 { 347 struct ipoib_dev_priv *priv = netdev_priv(dev); 348 struct { 349 struct ib_recv_wr wr; 350 struct ib_sge sge[IPOIB_CM_RX_SG]; 351 } *t; 352 int ret; 353 int i; 354 355 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 356 if (!rx->rx_ring) { 357 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 358 priv->ca->name, ipoib_recvq_size); 359 return -ENOMEM; 360 } 361 362 t = kmalloc(sizeof *t, GFP_KERNEL); 363 if (!t) { 364 ret = -ENOMEM; 365 goto err_free; 366 } 367 368 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 369 370 spin_lock_irq(&priv->lock); 371 372 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 373 spin_unlock_irq(&priv->lock); 374 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 375 ret = -EINVAL; 376 goto err_free; 377 } else 378 ++priv->cm.nonsrq_conn_qp; 379 380 spin_unlock_irq(&priv->lock); 381 382 for (i = 0; i < ipoib_recvq_size; ++i) { 383 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 384 rx->rx_ring[i].mapping)) { 385 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 386 ret = -ENOMEM; 387 goto err_count; 388 } 389 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 390 if (ret) { 391 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 392 "failed for buf %d\n", i); 393 ret = -EIO; 394 goto err_count; 395 } 396 } 397 398 rx->recv_count = ipoib_recvq_size; 399 400 kfree(t); 401 402 return 0; 403 404 err_count: 405 spin_lock_irq(&priv->lock); 406 --priv->cm.nonsrq_conn_qp; 407 spin_unlock_irq(&priv->lock); 408 409 err_free: 410 kfree(t); 411 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 412 413 return ret; 414 } 415 416 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 417 struct ib_qp *qp, struct ib_cm_req_event_param *req, 418 unsigned psn) 419 { 420 struct ipoib_dev_priv *priv = netdev_priv(dev); 421 struct ipoib_cm_data data = {}; 422 struct ib_cm_rep_param rep = {}; 423 424 data.qpn = cpu_to_be32(priv->qp->qp_num); 425 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 426 427 rep.private_data = &data; 428 rep.private_data_len = sizeof data; 429 rep.flow_control = 0; 430 rep.rnr_retry_count = req->rnr_retry_count; 431 rep.srq = ipoib_cm_has_srq(dev); 432 rep.qp_num = qp->qp_num; 433 rep.starting_psn = psn; 434 return ib_send_cm_rep(cm_id, &rep); 435 } 436 437 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 438 { 439 struct net_device *dev = cm_id->context; 440 struct ipoib_dev_priv *priv = netdev_priv(dev); 441 struct ipoib_cm_rx *p; 442 unsigned psn; 443 int ret; 444 445 ipoib_dbg(priv, "REQ arrived\n"); 446 p = kzalloc(sizeof *p, GFP_KERNEL); 447 if (!p) 448 return -ENOMEM; 449 p->dev = dev; 450 p->id = cm_id; 451 cm_id->context = p; 452 p->state = IPOIB_CM_RX_LIVE; 453 p->jiffies = jiffies; 454 INIT_LIST_HEAD(&p->list); 455 456 p->qp = ipoib_cm_create_rx_qp(dev, p); 457 if (IS_ERR(p->qp)) { 458 ret = PTR_ERR(p->qp); 459 goto err_qp; 460 } 461 462 psn = random32() & 0xffffff; 463 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 464 if (ret) 465 goto err_modify; 466 467 if (!ipoib_cm_has_srq(dev)) { 468 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 469 if (ret) 470 goto err_modify; 471 } 472 473 spin_lock_irq(&priv->lock); 474 queue_delayed_work(ipoib_workqueue, 475 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 476 /* Add this entry to passive ids list head, but do not re-add it 477 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 478 p->jiffies = jiffies; 479 if (p->state == IPOIB_CM_RX_LIVE) 480 list_move(&p->list, &priv->cm.passive_ids); 481 spin_unlock_irq(&priv->lock); 482 483 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 484 if (ret) { 485 ipoib_warn(priv, "failed to send REP: %d\n", ret); 486 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 487 ipoib_warn(priv, "unable to move qp to error state\n"); 488 } 489 return 0; 490 491 err_modify: 492 ib_destroy_qp(p->qp); 493 err_qp: 494 kfree(p); 495 return ret; 496 } 497 498 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 499 struct ib_cm_event *event) 500 { 501 struct ipoib_cm_rx *p; 502 struct ipoib_dev_priv *priv; 503 504 switch (event->event) { 505 case IB_CM_REQ_RECEIVED: 506 return ipoib_cm_req_handler(cm_id, event); 507 case IB_CM_DREQ_RECEIVED: 508 p = cm_id->context; 509 ib_send_cm_drep(cm_id, NULL, 0); 510 /* Fall through */ 511 case IB_CM_REJ_RECEIVED: 512 p = cm_id->context; 513 priv = netdev_priv(p->dev); 514 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 515 ipoib_warn(priv, "unable to move qp to error state\n"); 516 /* Fall through */ 517 default: 518 return 0; 519 } 520 } 521 /* Adjust length of skb with fragments to match received data */ 522 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 523 unsigned int length, struct sk_buff *toskb) 524 { 525 int i, num_frags; 526 unsigned int size; 527 528 /* put header into skb */ 529 size = min(length, hdr_space); 530 skb->tail += size; 531 skb->len += size; 532 length -= size; 533 534 num_frags = skb_shinfo(skb)->nr_frags; 535 for (i = 0; i < num_frags; i++) { 536 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 537 538 if (length == 0) { 539 /* don't need this page */ 540 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); 541 --skb_shinfo(skb)->nr_frags; 542 } else { 543 size = min(length, (unsigned) PAGE_SIZE); 544 545 frag->size = size; 546 skb->data_len += size; 547 skb->truesize += size; 548 skb->len += size; 549 length -= size; 550 } 551 } 552 } 553 554 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 555 { 556 struct ipoib_dev_priv *priv = netdev_priv(dev); 557 struct ipoib_cm_rx_buf *rx_ring; 558 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 559 struct sk_buff *skb, *newskb; 560 struct ipoib_cm_rx *p; 561 unsigned long flags; 562 u64 mapping[IPOIB_CM_RX_SG]; 563 int frags; 564 int has_srq; 565 struct sk_buff *small_skb; 566 567 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 568 wr_id, wc->status); 569 570 if (unlikely(wr_id >= ipoib_recvq_size)) { 571 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 572 spin_lock_irqsave(&priv->lock, flags); 573 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 574 ipoib_cm_start_rx_drain(priv); 575 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 576 spin_unlock_irqrestore(&priv->lock, flags); 577 } else 578 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 579 wr_id, ipoib_recvq_size); 580 return; 581 } 582 583 p = wc->qp->qp_context; 584 585 has_srq = ipoib_cm_has_srq(dev); 586 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 587 588 skb = rx_ring[wr_id].skb; 589 590 if (unlikely(wc->status != IB_WC_SUCCESS)) { 591 ipoib_dbg(priv, "cm recv error " 592 "(status=%d, wrid=%d vend_err %x)\n", 593 wc->status, wr_id, wc->vendor_err); 594 ++dev->stats.rx_dropped; 595 if (has_srq) 596 goto repost; 597 else { 598 if (!--p->recv_count) { 599 spin_lock_irqsave(&priv->lock, flags); 600 list_move(&p->list, &priv->cm.rx_reap_list); 601 spin_unlock_irqrestore(&priv->lock, flags); 602 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 603 } 604 return; 605 } 606 } 607 608 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 609 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 610 spin_lock_irqsave(&priv->lock, flags); 611 p->jiffies = jiffies; 612 /* Move this entry to list head, but do not re-add it 613 * if it has been moved out of list. */ 614 if (p->state == IPOIB_CM_RX_LIVE) 615 list_move(&p->list, &priv->cm.passive_ids); 616 spin_unlock_irqrestore(&priv->lock, flags); 617 } 618 } 619 620 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 621 int dlen = wc->byte_len; 622 623 small_skb = dev_alloc_skb(dlen + 12); 624 if (small_skb) { 625 skb_reserve(small_skb, 12); 626 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 627 dlen, DMA_FROM_DEVICE); 628 skb_copy_from_linear_data(skb, small_skb->data, dlen); 629 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 630 dlen, DMA_FROM_DEVICE); 631 skb_put(small_skb, dlen); 632 skb = small_skb; 633 goto copied; 634 } 635 } 636 637 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 638 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 639 640 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 641 if (unlikely(!newskb)) { 642 /* 643 * If we can't allocate a new RX buffer, dump 644 * this packet and reuse the old buffer. 645 */ 646 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 647 ++dev->stats.rx_dropped; 648 goto repost; 649 } 650 651 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 652 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 653 654 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 655 wc->byte_len, wc->slid); 656 657 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 658 659 copied: 660 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 661 skb_reset_mac_header(skb); 662 skb_pull(skb, IPOIB_ENCAP_LEN); 663 664 ++dev->stats.rx_packets; 665 dev->stats.rx_bytes += skb->len; 666 667 skb->dev = dev; 668 /* XXX get correct PACKET_ type here */ 669 skb->pkt_type = PACKET_HOST; 670 netif_receive_skb(skb); 671 672 repost: 673 if (has_srq) { 674 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 675 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 676 "for buf %d\n", wr_id); 677 } else { 678 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 679 &priv->cm.rx_wr, 680 priv->cm.rx_sge, 681 wr_id))) { 682 --p->recv_count; 683 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 684 "for buf %d\n", wr_id); 685 } 686 } 687 } 688 689 static inline int post_send(struct ipoib_dev_priv *priv, 690 struct ipoib_cm_tx *tx, 691 unsigned int wr_id, 692 u64 addr, int len) 693 { 694 struct ib_send_wr *bad_wr; 695 696 priv->tx_sge[0].addr = addr; 697 priv->tx_sge[0].length = len; 698 699 priv->tx_wr.num_sge = 1; 700 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 701 702 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 703 } 704 705 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 706 { 707 struct ipoib_dev_priv *priv = netdev_priv(dev); 708 struct ipoib_cm_tx_buf *tx_req; 709 u64 addr; 710 int rc; 711 712 if (unlikely(skb->len > tx->mtu)) { 713 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 714 skb->len, tx->mtu); 715 ++dev->stats.tx_dropped; 716 ++dev->stats.tx_errors; 717 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 718 return; 719 } 720 721 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 722 tx->tx_head, skb->len, tx->qp->qp_num); 723 724 /* 725 * We put the skb into the tx_ring _before_ we call post_send() 726 * because it's entirely possible that the completion handler will 727 * run before we execute anything after the post_send(). That 728 * means we have to make sure everything is properly recorded and 729 * our state is consistent before we call post_send(). 730 */ 731 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 732 tx_req->skb = skb; 733 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 734 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 735 ++dev->stats.tx_errors; 736 dev_kfree_skb_any(skb); 737 return; 738 } 739 740 tx_req->mapping = addr; 741 742 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 743 addr, skb->len); 744 if (unlikely(rc)) { 745 ipoib_warn(priv, "post_send failed, error %d\n", rc); 746 ++dev->stats.tx_errors; 747 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 748 dev_kfree_skb_any(skb); 749 } else { 750 dev->trans_start = jiffies; 751 ++tx->tx_head; 752 753 if (++priv->tx_outstanding == ipoib_sendq_size) { 754 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 755 tx->qp->qp_num); 756 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 757 ipoib_warn(priv, "request notify on send CQ failed\n"); 758 netif_stop_queue(dev); 759 } 760 } 761 } 762 763 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 764 { 765 struct ipoib_dev_priv *priv = netdev_priv(dev); 766 struct ipoib_cm_tx *tx = wc->qp->qp_context; 767 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 768 struct ipoib_cm_tx_buf *tx_req; 769 unsigned long flags; 770 771 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 772 wr_id, wc->status); 773 774 if (unlikely(wr_id >= ipoib_sendq_size)) { 775 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 776 wr_id, ipoib_sendq_size); 777 return; 778 } 779 780 tx_req = &tx->tx_ring[wr_id]; 781 782 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 783 784 /* FIXME: is this right? Shouldn't we only increment on success? */ 785 ++dev->stats.tx_packets; 786 dev->stats.tx_bytes += tx_req->skb->len; 787 788 dev_kfree_skb_any(tx_req->skb); 789 790 netif_tx_lock(dev); 791 792 ++tx->tx_tail; 793 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 794 netif_queue_stopped(dev) && 795 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 796 netif_wake_queue(dev); 797 798 if (wc->status != IB_WC_SUCCESS && 799 wc->status != IB_WC_WR_FLUSH_ERR) { 800 struct ipoib_neigh *neigh; 801 802 ipoib_dbg(priv, "failed cm send event " 803 "(status=%d, wrid=%d vend_err %x)\n", 804 wc->status, wr_id, wc->vendor_err); 805 806 spin_lock_irqsave(&priv->lock, flags); 807 neigh = tx->neigh; 808 809 if (neigh) { 810 neigh->cm = NULL; 811 list_del(&neigh->list); 812 if (neigh->ah) 813 ipoib_put_ah(neigh->ah); 814 ipoib_neigh_free(dev, neigh); 815 816 tx->neigh = NULL; 817 } 818 819 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 820 list_move(&tx->list, &priv->cm.reap_list); 821 queue_work(ipoib_workqueue, &priv->cm.reap_task); 822 } 823 824 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 825 826 spin_unlock_irqrestore(&priv->lock, flags); 827 } 828 829 netif_tx_unlock(dev); 830 } 831 832 int ipoib_cm_dev_open(struct net_device *dev) 833 { 834 struct ipoib_dev_priv *priv = netdev_priv(dev); 835 int ret; 836 837 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 838 return 0; 839 840 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 841 if (IS_ERR(priv->cm.id)) { 842 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 843 ret = PTR_ERR(priv->cm.id); 844 goto err_cm; 845 } 846 847 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 848 0, NULL); 849 if (ret) { 850 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 851 IPOIB_CM_IETF_ID | priv->qp->qp_num); 852 goto err_listen; 853 } 854 855 return 0; 856 857 err_listen: 858 ib_destroy_cm_id(priv->cm.id); 859 err_cm: 860 priv->cm.id = NULL; 861 return ret; 862 } 863 864 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 865 { 866 struct ipoib_dev_priv *priv = netdev_priv(dev); 867 struct ipoib_cm_rx *rx, *n; 868 LIST_HEAD(list); 869 870 spin_lock_irq(&priv->lock); 871 list_splice_init(&priv->cm.rx_reap_list, &list); 872 spin_unlock_irq(&priv->lock); 873 874 list_for_each_entry_safe(rx, n, &list, list) { 875 ib_destroy_cm_id(rx->id); 876 ib_destroy_qp(rx->qp); 877 if (!ipoib_cm_has_srq(dev)) { 878 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 879 spin_lock_irq(&priv->lock); 880 --priv->cm.nonsrq_conn_qp; 881 spin_unlock_irq(&priv->lock); 882 } 883 kfree(rx); 884 } 885 } 886 887 void ipoib_cm_dev_stop(struct net_device *dev) 888 { 889 struct ipoib_dev_priv *priv = netdev_priv(dev); 890 struct ipoib_cm_rx *p; 891 unsigned long begin; 892 int ret; 893 894 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 895 return; 896 897 ib_destroy_cm_id(priv->cm.id); 898 priv->cm.id = NULL; 899 900 spin_lock_irq(&priv->lock); 901 while (!list_empty(&priv->cm.passive_ids)) { 902 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 903 list_move(&p->list, &priv->cm.rx_error_list); 904 p->state = IPOIB_CM_RX_ERROR; 905 spin_unlock_irq(&priv->lock); 906 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 907 if (ret) 908 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 909 spin_lock_irq(&priv->lock); 910 } 911 912 /* Wait for all RX to be drained */ 913 begin = jiffies; 914 915 while (!list_empty(&priv->cm.rx_error_list) || 916 !list_empty(&priv->cm.rx_flush_list) || 917 !list_empty(&priv->cm.rx_drain_list)) { 918 if (time_after(jiffies, begin + 5 * HZ)) { 919 ipoib_warn(priv, "RX drain timing out\n"); 920 921 /* 922 * assume the HW is wedged and just free up everything. 923 */ 924 list_splice_init(&priv->cm.rx_flush_list, 925 &priv->cm.rx_reap_list); 926 list_splice_init(&priv->cm.rx_error_list, 927 &priv->cm.rx_reap_list); 928 list_splice_init(&priv->cm.rx_drain_list, 929 &priv->cm.rx_reap_list); 930 break; 931 } 932 spin_unlock_irq(&priv->lock); 933 msleep(1); 934 ipoib_drain_cq(dev); 935 spin_lock_irq(&priv->lock); 936 } 937 938 spin_unlock_irq(&priv->lock); 939 940 ipoib_cm_free_rx_reap_list(dev); 941 942 cancel_delayed_work(&priv->cm.stale_task); 943 } 944 945 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 946 { 947 struct ipoib_cm_tx *p = cm_id->context; 948 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 949 struct ipoib_cm_data *data = event->private_data; 950 struct sk_buff_head skqueue; 951 struct ib_qp_attr qp_attr; 952 int qp_attr_mask, ret; 953 struct sk_buff *skb; 954 955 p->mtu = be32_to_cpu(data->mtu); 956 957 if (p->mtu <= IPOIB_ENCAP_LEN) { 958 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 959 p->mtu, IPOIB_ENCAP_LEN); 960 return -EINVAL; 961 } 962 963 qp_attr.qp_state = IB_QPS_RTR; 964 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 965 if (ret) { 966 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 967 return ret; 968 } 969 970 qp_attr.rq_psn = 0 /* FIXME */; 971 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 972 if (ret) { 973 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 974 return ret; 975 } 976 977 qp_attr.qp_state = IB_QPS_RTS; 978 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 979 if (ret) { 980 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 981 return ret; 982 } 983 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 984 if (ret) { 985 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 986 return ret; 987 } 988 989 skb_queue_head_init(&skqueue); 990 991 spin_lock_irq(&priv->lock); 992 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 993 if (p->neigh) 994 while ((skb = __skb_dequeue(&p->neigh->queue))) 995 __skb_queue_tail(&skqueue, skb); 996 spin_unlock_irq(&priv->lock); 997 998 while ((skb = __skb_dequeue(&skqueue))) { 999 skb->dev = p->dev; 1000 if (dev_queue_xmit(skb)) 1001 ipoib_warn(priv, "dev_queue_xmit failed " 1002 "to requeue packet\n"); 1003 } 1004 1005 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1006 if (ret) { 1007 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1008 return ret; 1009 } 1010 return 0; 1011 } 1012 1013 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1014 { 1015 struct ipoib_dev_priv *priv = netdev_priv(dev); 1016 struct ib_qp_init_attr attr = { 1017 .send_cq = priv->recv_cq, 1018 .recv_cq = priv->recv_cq, 1019 .srq = priv->cm.srq, 1020 .cap.max_send_wr = ipoib_sendq_size, 1021 .cap.max_send_sge = 1, 1022 .sq_sig_type = IB_SIGNAL_ALL_WR, 1023 .qp_type = IB_QPT_RC, 1024 .qp_context = tx 1025 }; 1026 1027 return ib_create_qp(priv->pd, &attr); 1028 } 1029 1030 static int ipoib_cm_send_req(struct net_device *dev, 1031 struct ib_cm_id *id, struct ib_qp *qp, 1032 u32 qpn, 1033 struct ib_sa_path_rec *pathrec) 1034 { 1035 struct ipoib_dev_priv *priv = netdev_priv(dev); 1036 struct ipoib_cm_data data = {}; 1037 struct ib_cm_req_param req = {}; 1038 1039 data.qpn = cpu_to_be32(priv->qp->qp_num); 1040 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1041 1042 req.primary_path = pathrec; 1043 req.alternate_path = NULL; 1044 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1045 req.qp_num = qp->qp_num; 1046 req.qp_type = qp->qp_type; 1047 req.private_data = &data; 1048 req.private_data_len = sizeof data; 1049 req.flow_control = 0; 1050 1051 req.starting_psn = 0; /* FIXME */ 1052 1053 /* 1054 * Pick some arbitrary defaults here; we could make these 1055 * module parameters if anyone cared about setting them. 1056 */ 1057 req.responder_resources = 4; 1058 req.remote_cm_response_timeout = 20; 1059 req.local_cm_response_timeout = 20; 1060 req.retry_count = 0; /* RFC draft warns against retries */ 1061 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1062 req.max_cm_retries = 15; 1063 req.srq = ipoib_cm_has_srq(dev); 1064 return ib_send_cm_req(id, &req); 1065 } 1066 1067 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1068 struct ib_cm_id *cm_id, struct ib_qp *qp) 1069 { 1070 struct ipoib_dev_priv *priv = netdev_priv(dev); 1071 struct ib_qp_attr qp_attr; 1072 int qp_attr_mask, ret; 1073 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1074 if (ret) { 1075 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1076 return ret; 1077 } 1078 1079 qp_attr.qp_state = IB_QPS_INIT; 1080 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1081 qp_attr.port_num = priv->port; 1082 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1083 1084 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1085 if (ret) { 1086 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1087 return ret; 1088 } 1089 return 0; 1090 } 1091 1092 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1093 struct ib_sa_path_rec *pathrec) 1094 { 1095 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1096 int ret; 1097 1098 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring); 1099 if (!p->tx_ring) { 1100 ipoib_warn(priv, "failed to allocate tx ring\n"); 1101 ret = -ENOMEM; 1102 goto err_tx; 1103 } 1104 1105 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1106 if (IS_ERR(p->qp)) { 1107 ret = PTR_ERR(p->qp); 1108 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1109 goto err_qp; 1110 } 1111 1112 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1113 if (IS_ERR(p->id)) { 1114 ret = PTR_ERR(p->id); 1115 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1116 goto err_id; 1117 } 1118 1119 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1120 if (ret) { 1121 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1122 goto err_modify; 1123 } 1124 1125 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1126 if (ret) { 1127 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1128 goto err_send_cm; 1129 } 1130 1131 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1132 p->qp->qp_num, pathrec->dgid.raw, qpn); 1133 1134 return 0; 1135 1136 err_send_cm: 1137 err_modify: 1138 ib_destroy_cm_id(p->id); 1139 err_id: 1140 p->id = NULL; 1141 ib_destroy_qp(p->qp); 1142 err_qp: 1143 p->qp = NULL; 1144 vfree(p->tx_ring); 1145 err_tx: 1146 return ret; 1147 } 1148 1149 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1150 { 1151 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1152 struct ipoib_cm_tx_buf *tx_req; 1153 unsigned long begin; 1154 1155 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1156 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1157 1158 if (p->id) 1159 ib_destroy_cm_id(p->id); 1160 1161 if (p->tx_ring) { 1162 /* Wait for all sends to complete */ 1163 begin = jiffies; 1164 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1165 if (time_after(jiffies, begin + 5 * HZ)) { 1166 ipoib_warn(priv, "timing out; %d sends not completed\n", 1167 p->tx_head - p->tx_tail); 1168 goto timeout; 1169 } 1170 1171 msleep(1); 1172 } 1173 } 1174 1175 timeout: 1176 1177 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1178 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1179 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1180 DMA_TO_DEVICE); 1181 dev_kfree_skb_any(tx_req->skb); 1182 ++p->tx_tail; 1183 netif_tx_lock_bh(p->dev); 1184 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1185 netif_queue_stopped(p->dev) && 1186 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1187 netif_wake_queue(p->dev); 1188 netif_tx_unlock_bh(p->dev); 1189 } 1190 1191 if (p->qp) 1192 ib_destroy_qp(p->qp); 1193 1194 vfree(p->tx_ring); 1195 kfree(p); 1196 } 1197 1198 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1199 struct ib_cm_event *event) 1200 { 1201 struct ipoib_cm_tx *tx = cm_id->context; 1202 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1203 struct net_device *dev = priv->dev; 1204 struct ipoib_neigh *neigh; 1205 unsigned long flags; 1206 int ret; 1207 1208 switch (event->event) { 1209 case IB_CM_DREQ_RECEIVED: 1210 ipoib_dbg(priv, "DREQ received.\n"); 1211 ib_send_cm_drep(cm_id, NULL, 0); 1212 break; 1213 case IB_CM_REP_RECEIVED: 1214 ipoib_dbg(priv, "REP received.\n"); 1215 ret = ipoib_cm_rep_handler(cm_id, event); 1216 if (ret) 1217 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1218 NULL, 0, NULL, 0); 1219 break; 1220 case IB_CM_REQ_ERROR: 1221 case IB_CM_REJ_RECEIVED: 1222 case IB_CM_TIMEWAIT_EXIT: 1223 ipoib_dbg(priv, "CM error %d.\n", event->event); 1224 netif_tx_lock_bh(dev); 1225 spin_lock_irqsave(&priv->lock, flags); 1226 neigh = tx->neigh; 1227 1228 if (neigh) { 1229 neigh->cm = NULL; 1230 list_del(&neigh->list); 1231 if (neigh->ah) 1232 ipoib_put_ah(neigh->ah); 1233 ipoib_neigh_free(dev, neigh); 1234 1235 tx->neigh = NULL; 1236 } 1237 1238 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1239 list_move(&tx->list, &priv->cm.reap_list); 1240 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1241 } 1242 1243 spin_unlock_irqrestore(&priv->lock, flags); 1244 netif_tx_unlock_bh(dev); 1245 break; 1246 default: 1247 break; 1248 } 1249 1250 return 0; 1251 } 1252 1253 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1254 struct ipoib_neigh *neigh) 1255 { 1256 struct ipoib_dev_priv *priv = netdev_priv(dev); 1257 struct ipoib_cm_tx *tx; 1258 1259 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1260 if (!tx) 1261 return NULL; 1262 1263 neigh->cm = tx; 1264 tx->neigh = neigh; 1265 tx->path = path; 1266 tx->dev = dev; 1267 list_add(&tx->list, &priv->cm.start_list); 1268 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1269 queue_work(ipoib_workqueue, &priv->cm.start_task); 1270 return tx; 1271 } 1272 1273 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1274 { 1275 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1276 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1277 list_move(&tx->list, &priv->cm.reap_list); 1278 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1279 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1280 tx->neigh->dgid.raw); 1281 tx->neigh = NULL; 1282 } 1283 } 1284 1285 static void ipoib_cm_tx_start(struct work_struct *work) 1286 { 1287 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1288 cm.start_task); 1289 struct net_device *dev = priv->dev; 1290 struct ipoib_neigh *neigh; 1291 struct ipoib_cm_tx *p; 1292 unsigned long flags; 1293 int ret; 1294 1295 struct ib_sa_path_rec pathrec; 1296 u32 qpn; 1297 1298 netif_tx_lock_bh(dev); 1299 spin_lock_irqsave(&priv->lock, flags); 1300 1301 while (!list_empty(&priv->cm.start_list)) { 1302 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1303 list_del_init(&p->list); 1304 neigh = p->neigh; 1305 qpn = IPOIB_QPN(neigh->neighbour->ha); 1306 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1307 1308 spin_unlock_irqrestore(&priv->lock, flags); 1309 netif_tx_unlock_bh(dev); 1310 1311 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1312 1313 netif_tx_lock_bh(dev); 1314 spin_lock_irqsave(&priv->lock, flags); 1315 1316 if (ret) { 1317 neigh = p->neigh; 1318 if (neigh) { 1319 neigh->cm = NULL; 1320 list_del(&neigh->list); 1321 if (neigh->ah) 1322 ipoib_put_ah(neigh->ah); 1323 ipoib_neigh_free(dev, neigh); 1324 } 1325 list_del(&p->list); 1326 kfree(p); 1327 } 1328 } 1329 1330 spin_unlock_irqrestore(&priv->lock, flags); 1331 netif_tx_unlock_bh(dev); 1332 } 1333 1334 static void ipoib_cm_tx_reap(struct work_struct *work) 1335 { 1336 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1337 cm.reap_task); 1338 struct net_device *dev = priv->dev; 1339 struct ipoib_cm_tx *p; 1340 unsigned long flags; 1341 1342 netif_tx_lock_bh(dev); 1343 spin_lock_irqsave(&priv->lock, flags); 1344 1345 while (!list_empty(&priv->cm.reap_list)) { 1346 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1347 list_del(&p->list); 1348 spin_unlock_irqrestore(&priv->lock, flags); 1349 netif_tx_unlock_bh(dev); 1350 ipoib_cm_tx_destroy(p); 1351 netif_tx_lock_bh(dev); 1352 spin_lock_irqsave(&priv->lock, flags); 1353 } 1354 1355 spin_unlock_irqrestore(&priv->lock, flags); 1356 netif_tx_unlock_bh(dev); 1357 } 1358 1359 static void ipoib_cm_skb_reap(struct work_struct *work) 1360 { 1361 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1362 cm.skb_task); 1363 struct net_device *dev = priv->dev; 1364 struct sk_buff *skb; 1365 unsigned long flags; 1366 unsigned mtu = priv->mcast_mtu; 1367 1368 netif_tx_lock_bh(dev); 1369 spin_lock_irqsave(&priv->lock, flags); 1370 1371 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1372 spin_unlock_irqrestore(&priv->lock, flags); 1373 netif_tx_unlock_bh(dev); 1374 1375 if (skb->protocol == htons(ETH_P_IP)) 1376 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1378 else if (skb->protocol == htons(ETH_P_IPV6)) 1379 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1380 #endif 1381 dev_kfree_skb_any(skb); 1382 1383 netif_tx_lock_bh(dev); 1384 spin_lock_irqsave(&priv->lock, flags); 1385 } 1386 1387 spin_unlock_irqrestore(&priv->lock, flags); 1388 netif_tx_unlock_bh(dev); 1389 } 1390 1391 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1392 unsigned int mtu) 1393 { 1394 struct ipoib_dev_priv *priv = netdev_priv(dev); 1395 int e = skb_queue_empty(&priv->cm.skb_queue); 1396 1397 if (skb_dst(skb)) 1398 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); 1399 1400 skb_queue_tail(&priv->cm.skb_queue, skb); 1401 if (e) 1402 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1403 } 1404 1405 static void ipoib_cm_rx_reap(struct work_struct *work) 1406 { 1407 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1408 cm.rx_reap_task)->dev); 1409 } 1410 1411 static void ipoib_cm_stale_task(struct work_struct *work) 1412 { 1413 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1414 cm.stale_task.work); 1415 struct ipoib_cm_rx *p; 1416 int ret; 1417 1418 spin_lock_irq(&priv->lock); 1419 while (!list_empty(&priv->cm.passive_ids)) { 1420 /* List is sorted by LRU, start from tail, 1421 * stop when we see a recently used entry */ 1422 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1423 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1424 break; 1425 list_move(&p->list, &priv->cm.rx_error_list); 1426 p->state = IPOIB_CM_RX_ERROR; 1427 spin_unlock_irq(&priv->lock); 1428 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1429 if (ret) 1430 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1431 spin_lock_irq(&priv->lock); 1432 } 1433 1434 if (!list_empty(&priv->cm.passive_ids)) 1435 queue_delayed_work(ipoib_workqueue, 1436 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1437 spin_unlock_irq(&priv->lock); 1438 } 1439 1440 1441 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1442 char *buf) 1443 { 1444 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1445 1446 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1447 return sprintf(buf, "connected\n"); 1448 else 1449 return sprintf(buf, "datagram\n"); 1450 } 1451 1452 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1453 const char *buf, size_t count) 1454 { 1455 struct net_device *dev = to_net_dev(d); 1456 struct ipoib_dev_priv *priv = netdev_priv(dev); 1457 1458 if (!rtnl_trylock()) 1459 return restart_syscall(); 1460 1461 /* flush paths if we switch modes so that connections are restarted */ 1462 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1463 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1464 ipoib_warn(priv, "enabling connected mode " 1465 "will cause multicast packet drops\n"); 1466 netdev_update_features(dev); 1467 rtnl_unlock(); 1468 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 1469 1470 ipoib_flush_paths(dev); 1471 return count; 1472 } 1473 1474 if (!strcmp(buf, "datagram\n")) { 1475 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1476 netdev_update_features(dev); 1477 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 1478 rtnl_unlock(); 1479 ipoib_flush_paths(dev); 1480 1481 return count; 1482 } 1483 rtnl_unlock(); 1484 1485 return -EINVAL; 1486 } 1487 1488 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1489 1490 int ipoib_cm_add_mode_attr(struct net_device *dev) 1491 { 1492 return device_create_file(&dev->dev, &dev_attr_mode); 1493 } 1494 1495 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1496 { 1497 struct ipoib_dev_priv *priv = netdev_priv(dev); 1498 struct ib_srq_init_attr srq_init_attr = { 1499 .attr = { 1500 .max_wr = ipoib_recvq_size, 1501 .max_sge = max_sge 1502 } 1503 }; 1504 1505 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1506 if (IS_ERR(priv->cm.srq)) { 1507 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1508 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1509 priv->ca->name, PTR_ERR(priv->cm.srq)); 1510 priv->cm.srq = NULL; 1511 return; 1512 } 1513 1514 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1515 if (!priv->cm.srq_ring) { 1516 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1517 priv->ca->name, ipoib_recvq_size); 1518 ib_destroy_srq(priv->cm.srq); 1519 priv->cm.srq = NULL; 1520 return; 1521 } 1522 1523 } 1524 1525 int ipoib_cm_dev_init(struct net_device *dev) 1526 { 1527 struct ipoib_dev_priv *priv = netdev_priv(dev); 1528 int i, ret; 1529 struct ib_device_attr attr; 1530 1531 INIT_LIST_HEAD(&priv->cm.passive_ids); 1532 INIT_LIST_HEAD(&priv->cm.reap_list); 1533 INIT_LIST_HEAD(&priv->cm.start_list); 1534 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1535 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1536 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1537 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1538 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1539 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1540 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1541 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1542 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1543 1544 skb_queue_head_init(&priv->cm.skb_queue); 1545 1546 ret = ib_query_device(priv->ca, &attr); 1547 if (ret) { 1548 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1549 return ret; 1550 } 1551 1552 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1553 1554 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1555 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1556 if (ipoib_cm_has_srq(dev)) { 1557 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1558 priv->cm.num_frags = attr.max_srq_sge; 1559 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1560 priv->cm.max_cm_mtu, priv->cm.num_frags); 1561 } else { 1562 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1563 priv->cm.num_frags = IPOIB_CM_RX_SG; 1564 } 1565 1566 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1567 1568 if (ipoib_cm_has_srq(dev)) { 1569 for (i = 0; i < ipoib_recvq_size; ++i) { 1570 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1571 priv->cm.num_frags - 1, 1572 priv->cm.srq_ring[i].mapping)) { 1573 ipoib_warn(priv, "failed to allocate " 1574 "receive buffer %d\n", i); 1575 ipoib_cm_dev_cleanup(dev); 1576 return -ENOMEM; 1577 } 1578 1579 if (ipoib_cm_post_receive_srq(dev, i)) { 1580 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1581 "failed for buf %d\n", i); 1582 ipoib_cm_dev_cleanup(dev); 1583 return -EIO; 1584 } 1585 } 1586 } 1587 1588 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1589 return 0; 1590 } 1591 1592 void ipoib_cm_dev_cleanup(struct net_device *dev) 1593 { 1594 struct ipoib_dev_priv *priv = netdev_priv(dev); 1595 int ret; 1596 1597 if (!priv->cm.srq) 1598 return; 1599 1600 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1601 1602 ret = ib_destroy_srq(priv->cm.srq); 1603 if (ret) 1604 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1605 1606 priv->cm.srq = NULL; 1607 if (!priv->cm.srq_ring) 1608 return; 1609 1610 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1611 priv->cm.srq_ring = NULL; 1612 } 1613