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/vmalloc.h> 39 40 #include "ipoib.h" 41 42 int ipoib_max_conn_qp = 128; 43 44 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 45 MODULE_PARM_DESC(max_nonsrq_conn_qp, 46 "Max number of connected-mode QPs per interface " 47 "(applied only if shared receive queue is not available)"); 48 49 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 50 static int data_debug_level; 51 52 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 53 MODULE_PARM_DESC(cm_data_debug_level, 54 "Enable data path debug tracing for connected mode if > 0"); 55 #endif 56 57 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 58 59 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 60 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 61 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 62 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 63 64 static struct ib_qp_attr ipoib_cm_err_attr = { 65 .qp_state = IB_QPS_ERR 66 }; 67 68 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 69 70 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 71 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 72 .opcode = IB_WR_SEND, 73 }; 74 75 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 76 struct ib_cm_event *event); 77 78 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 79 u64 mapping[IPOIB_CM_RX_SG]) 80 { 81 int i; 82 83 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 84 85 for (i = 0; i < frags; ++i) 86 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 87 } 88 89 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 90 { 91 struct ipoib_dev_priv *priv = netdev_priv(dev); 92 struct ib_recv_wr *bad_wr; 93 int i, ret; 94 95 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 96 97 for (i = 0; i < priv->cm.num_frags; ++i) 98 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 99 100 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 101 if (unlikely(ret)) { 102 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 103 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 104 priv->cm.srq_ring[id].mapping); 105 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 106 priv->cm.srq_ring[id].skb = NULL; 107 } 108 109 return ret; 110 } 111 112 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 113 struct ipoib_cm_rx *rx, 114 struct ib_recv_wr *wr, 115 struct ib_sge *sge, int id) 116 { 117 struct ipoib_dev_priv *priv = netdev_priv(dev); 118 struct ib_recv_wr *bad_wr; 119 int i, ret; 120 121 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 122 123 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 124 sge[i].addr = rx->rx_ring[id].mapping[i]; 125 126 ret = ib_post_recv(rx->qp, wr, &bad_wr); 127 if (unlikely(ret)) { 128 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 129 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 130 rx->rx_ring[id].mapping); 131 dev_kfree_skb_any(rx->rx_ring[id].skb); 132 rx->rx_ring[id].skb = NULL; 133 } 134 135 return ret; 136 } 137 138 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 139 struct ipoib_cm_rx_buf *rx_ring, 140 int id, int frags, 141 u64 mapping[IPOIB_CM_RX_SG]) 142 { 143 struct ipoib_dev_priv *priv = netdev_priv(dev); 144 struct sk_buff *skb; 145 int i; 146 147 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 148 if (unlikely(!skb)) 149 return NULL; 150 151 /* 152 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 153 * IP header to a multiple of 16. 154 */ 155 skb_reserve(skb, 12); 156 157 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 158 DMA_FROM_DEVICE); 159 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 160 dev_kfree_skb_any(skb); 161 return NULL; 162 } 163 164 for (i = 0; i < frags; i++) { 165 struct page *page = alloc_page(GFP_ATOMIC); 166 167 if (!page) 168 goto partial_error; 169 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 170 171 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, 172 0, PAGE_SIZE, DMA_FROM_DEVICE); 173 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 174 goto partial_error; 175 } 176 177 rx_ring[id].skb = skb; 178 return skb; 179 180 partial_error: 181 182 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 183 184 for (; i > 0; --i) 185 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 186 187 dev_kfree_skb_any(skb); 188 return NULL; 189 } 190 191 static void ipoib_cm_free_rx_ring(struct net_device *dev, 192 struct ipoib_cm_rx_buf *rx_ring) 193 { 194 struct ipoib_dev_priv *priv = netdev_priv(dev); 195 int i; 196 197 for (i = 0; i < ipoib_recvq_size; ++i) 198 if (rx_ring[i].skb) { 199 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 200 rx_ring[i].mapping); 201 dev_kfree_skb_any(rx_ring[i].skb); 202 } 203 204 vfree(rx_ring); 205 } 206 207 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 208 { 209 struct ib_send_wr *bad_wr; 210 struct ipoib_cm_rx *p; 211 212 /* We only reserved 1 extra slot in CQ for drain WRs, so 213 * make sure we have at most 1 outstanding WR. */ 214 if (list_empty(&priv->cm.rx_flush_list) || 215 !list_empty(&priv->cm.rx_drain_list)) 216 return; 217 218 /* 219 * QPs on flush list are error state. This way, a "flush 220 * error" WC will be immediately generated for each WR we post. 221 */ 222 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 223 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 224 ipoib_warn(priv, "failed to post drain wr\n"); 225 226 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 227 } 228 229 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 230 { 231 struct ipoib_cm_rx *p = ctx; 232 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 233 unsigned long flags; 234 235 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 236 return; 237 238 spin_lock_irqsave(&priv->lock, flags); 239 list_move(&p->list, &priv->cm.rx_flush_list); 240 p->state = IPOIB_CM_RX_FLUSH; 241 ipoib_cm_start_rx_drain(priv); 242 spin_unlock_irqrestore(&priv->lock, flags); 243 } 244 245 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 246 struct ipoib_cm_rx *p) 247 { 248 struct ipoib_dev_priv *priv = netdev_priv(dev); 249 struct ib_qp_init_attr attr = { 250 .event_handler = ipoib_cm_rx_event_handler, 251 .send_cq = priv->recv_cq, /* For drain WR */ 252 .recv_cq = priv->recv_cq, 253 .srq = priv->cm.srq, 254 .cap.max_send_wr = 1, /* For drain WR */ 255 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 256 .sq_sig_type = IB_SIGNAL_ALL_WR, 257 .qp_type = IB_QPT_RC, 258 .qp_context = p, 259 }; 260 261 if (!ipoib_cm_has_srq(dev)) { 262 attr.cap.max_recv_wr = ipoib_recvq_size; 263 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 264 } 265 266 return ib_create_qp(priv->pd, &attr); 267 } 268 269 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 270 struct ib_cm_id *cm_id, struct ib_qp *qp, 271 unsigned psn) 272 { 273 struct ipoib_dev_priv *priv = netdev_priv(dev); 274 struct ib_qp_attr qp_attr; 275 int qp_attr_mask, ret; 276 277 qp_attr.qp_state = IB_QPS_INIT; 278 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 279 if (ret) { 280 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 281 return ret; 282 } 283 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 284 if (ret) { 285 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 286 return ret; 287 } 288 qp_attr.qp_state = IB_QPS_RTR; 289 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 290 if (ret) { 291 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 292 return ret; 293 } 294 qp_attr.rq_psn = psn; 295 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 296 if (ret) { 297 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 298 return ret; 299 } 300 301 /* 302 * Current Mellanox HCA firmware won't generate completions 303 * with error for drain WRs unless the QP has been moved to 304 * RTS first. This work-around leaves a window where a QP has 305 * moved to error asynchronously, but this will eventually get 306 * fixed in firmware, so let's not error out if modify QP 307 * fails. 308 */ 309 qp_attr.qp_state = IB_QPS_RTS; 310 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 311 if (ret) { 312 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 313 return 0; 314 } 315 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 316 if (ret) { 317 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 318 return 0; 319 } 320 321 return 0; 322 } 323 324 static void ipoib_cm_init_rx_wr(struct net_device *dev, 325 struct ib_recv_wr *wr, 326 struct ib_sge *sge) 327 { 328 struct ipoib_dev_priv *priv = netdev_priv(dev); 329 int i; 330 331 for (i = 0; i < priv->cm.num_frags; ++i) 332 sge[i].lkey = priv->mr->lkey; 333 334 sge[0].length = IPOIB_CM_HEAD_SIZE; 335 for (i = 1; i < priv->cm.num_frags; ++i) 336 sge[i].length = PAGE_SIZE; 337 338 wr->next = NULL; 339 wr->sg_list = sge; 340 wr->num_sge = priv->cm.num_frags; 341 } 342 343 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 344 struct ipoib_cm_rx *rx) 345 { 346 struct ipoib_dev_priv *priv = netdev_priv(dev); 347 struct { 348 struct ib_recv_wr wr; 349 struct ib_sge sge[IPOIB_CM_RX_SG]; 350 } *t; 351 int ret; 352 int i; 353 354 rx->rx_ring = vmalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 355 if (!rx->rx_ring) { 356 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 357 priv->ca->name, ipoib_recvq_size); 358 return -ENOMEM; 359 } 360 361 memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring); 362 363 t = kmalloc(sizeof *t, GFP_KERNEL); 364 if (!t) { 365 ret = -ENOMEM; 366 goto err_free; 367 } 368 369 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 370 371 spin_lock_irq(&priv->lock); 372 373 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 374 spin_unlock_irq(&priv->lock); 375 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 376 ret = -EINVAL; 377 goto err_free; 378 } else 379 ++priv->cm.nonsrq_conn_qp; 380 381 spin_unlock_irq(&priv->lock); 382 383 for (i = 0; i < ipoib_recvq_size; ++i) { 384 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 385 rx->rx_ring[i].mapping)) { 386 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 387 ret = -ENOMEM; 388 goto err_count; 389 } 390 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 391 if (ret) { 392 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 393 "failed for buf %d\n", i); 394 ret = -EIO; 395 goto err_count; 396 } 397 } 398 399 rx->recv_count = ipoib_recvq_size; 400 401 kfree(t); 402 403 return 0; 404 405 err_count: 406 spin_lock_irq(&priv->lock); 407 --priv->cm.nonsrq_conn_qp; 408 spin_unlock_irq(&priv->lock); 409 410 err_free: 411 kfree(t); 412 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 413 414 return ret; 415 } 416 417 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 418 struct ib_qp *qp, struct ib_cm_req_event_param *req, 419 unsigned psn) 420 { 421 struct ipoib_dev_priv *priv = netdev_priv(dev); 422 struct ipoib_cm_data data = {}; 423 struct ib_cm_rep_param rep = {}; 424 425 data.qpn = cpu_to_be32(priv->qp->qp_num); 426 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 427 428 rep.private_data = &data; 429 rep.private_data_len = sizeof data; 430 rep.flow_control = 0; 431 rep.rnr_retry_count = req->rnr_retry_count; 432 rep.srq = ipoib_cm_has_srq(dev); 433 rep.qp_num = qp->qp_num; 434 rep.starting_psn = psn; 435 return ib_send_cm_rep(cm_id, &rep); 436 } 437 438 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 439 { 440 struct net_device *dev = cm_id->context; 441 struct ipoib_dev_priv *priv = netdev_priv(dev); 442 struct ipoib_cm_rx *p; 443 unsigned psn; 444 int ret; 445 446 ipoib_dbg(priv, "REQ arrived\n"); 447 p = kzalloc(sizeof *p, GFP_KERNEL); 448 if (!p) 449 return -ENOMEM; 450 p->dev = dev; 451 p->id = cm_id; 452 cm_id->context = p; 453 p->state = IPOIB_CM_RX_LIVE; 454 p->jiffies = jiffies; 455 INIT_LIST_HEAD(&p->list); 456 457 p->qp = ipoib_cm_create_rx_qp(dev, p); 458 if (IS_ERR(p->qp)) { 459 ret = PTR_ERR(p->qp); 460 goto err_qp; 461 } 462 463 psn = random32() & 0xffffff; 464 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 465 if (ret) 466 goto err_modify; 467 468 if (!ipoib_cm_has_srq(dev)) { 469 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 470 if (ret) 471 goto err_modify; 472 } 473 474 spin_lock_irq(&priv->lock); 475 queue_delayed_work(ipoib_workqueue, 476 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 477 /* Add this entry to passive ids list head, but do not re-add it 478 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 479 p->jiffies = jiffies; 480 if (p->state == IPOIB_CM_RX_LIVE) 481 list_move(&p->list, &priv->cm.passive_ids); 482 spin_unlock_irq(&priv->lock); 483 484 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 485 if (ret) { 486 ipoib_warn(priv, "failed to send REP: %d\n", ret); 487 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 488 ipoib_warn(priv, "unable to move qp to error state\n"); 489 } 490 return 0; 491 492 err_modify: 493 ib_destroy_qp(p->qp); 494 err_qp: 495 kfree(p); 496 return ret; 497 } 498 499 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 500 struct ib_cm_event *event) 501 { 502 struct ipoib_cm_rx *p; 503 struct ipoib_dev_priv *priv; 504 505 switch (event->event) { 506 case IB_CM_REQ_RECEIVED: 507 return ipoib_cm_req_handler(cm_id, event); 508 case IB_CM_DREQ_RECEIVED: 509 p = cm_id->context; 510 ib_send_cm_drep(cm_id, NULL, 0); 511 /* Fall through */ 512 case IB_CM_REJ_RECEIVED: 513 p = cm_id->context; 514 priv = netdev_priv(p->dev); 515 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 516 ipoib_warn(priv, "unable to move qp to error state\n"); 517 /* Fall through */ 518 default: 519 return 0; 520 } 521 } 522 /* Adjust length of skb with fragments to match received data */ 523 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 524 unsigned int length, struct sk_buff *toskb) 525 { 526 int i, num_frags; 527 unsigned int size; 528 529 /* put header into skb */ 530 size = min(length, hdr_space); 531 skb->tail += size; 532 skb->len += size; 533 length -= size; 534 535 num_frags = skb_shinfo(skb)->nr_frags; 536 for (i = 0; i < num_frags; i++) { 537 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 538 539 if (length == 0) { 540 /* don't need this page */ 541 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); 542 --skb_shinfo(skb)->nr_frags; 543 } else { 544 size = min(length, (unsigned) PAGE_SIZE); 545 546 frag->size = size; 547 skb->data_len += size; 548 skb->truesize += size; 549 skb->len += size; 550 length -= size; 551 } 552 } 553 } 554 555 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 556 { 557 struct ipoib_dev_priv *priv = netdev_priv(dev); 558 struct ipoib_cm_rx_buf *rx_ring; 559 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 560 struct sk_buff *skb, *newskb; 561 struct ipoib_cm_rx *p; 562 unsigned long flags; 563 u64 mapping[IPOIB_CM_RX_SG]; 564 int frags; 565 int has_srq; 566 struct sk_buff *small_skb; 567 568 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 569 wr_id, wc->status); 570 571 if (unlikely(wr_id >= ipoib_recvq_size)) { 572 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 573 spin_lock_irqsave(&priv->lock, flags); 574 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 575 ipoib_cm_start_rx_drain(priv); 576 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 577 spin_unlock_irqrestore(&priv->lock, flags); 578 } else 579 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 580 wr_id, ipoib_recvq_size); 581 return; 582 } 583 584 p = wc->qp->qp_context; 585 586 has_srq = ipoib_cm_has_srq(dev); 587 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 588 589 skb = rx_ring[wr_id].skb; 590 591 if (unlikely(wc->status != IB_WC_SUCCESS)) { 592 ipoib_dbg(priv, "cm recv error " 593 "(status=%d, wrid=%d vend_err %x)\n", 594 wc->status, wr_id, wc->vendor_err); 595 ++dev->stats.rx_dropped; 596 if (has_srq) 597 goto repost; 598 else { 599 if (!--p->recv_count) { 600 spin_lock_irqsave(&priv->lock, flags); 601 list_move(&p->list, &priv->cm.rx_reap_list); 602 spin_unlock_irqrestore(&priv->lock, flags); 603 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 604 } 605 return; 606 } 607 } 608 609 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 610 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 611 spin_lock_irqsave(&priv->lock, flags); 612 p->jiffies = jiffies; 613 /* Move this entry to list head, but do not re-add it 614 * if it has been moved out of list. */ 615 if (p->state == IPOIB_CM_RX_LIVE) 616 list_move(&p->list, &priv->cm.passive_ids); 617 spin_unlock_irqrestore(&priv->lock, flags); 618 } 619 } 620 621 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 622 int dlen = wc->byte_len; 623 624 small_skb = dev_alloc_skb(dlen + 12); 625 if (small_skb) { 626 skb_reserve(small_skb, 12); 627 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 628 dlen, DMA_FROM_DEVICE); 629 skb_copy_from_linear_data(skb, small_skb->data, dlen); 630 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 631 dlen, DMA_FROM_DEVICE); 632 skb_put(small_skb, dlen); 633 skb = small_skb; 634 goto copied; 635 } 636 } 637 638 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 639 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 640 641 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 642 if (unlikely(!newskb)) { 643 /* 644 * If we can't allocate a new RX buffer, dump 645 * this packet and reuse the old buffer. 646 */ 647 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 648 ++dev->stats.rx_dropped; 649 goto repost; 650 } 651 652 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 653 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 654 655 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 656 wc->byte_len, wc->slid); 657 658 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 659 660 copied: 661 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 662 skb_reset_mac_header(skb); 663 skb_pull(skb, IPOIB_ENCAP_LEN); 664 665 ++dev->stats.rx_packets; 666 dev->stats.rx_bytes += skb->len; 667 668 skb->dev = dev; 669 /* XXX get correct PACKET_ type here */ 670 skb->pkt_type = PACKET_HOST; 671 netif_receive_skb(skb); 672 673 repost: 674 if (has_srq) { 675 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 676 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 677 "for buf %d\n", wr_id); 678 } else { 679 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 680 &priv->cm.rx_wr, 681 priv->cm.rx_sge, 682 wr_id))) { 683 --p->recv_count; 684 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 685 "for buf %d\n", wr_id); 686 } 687 } 688 } 689 690 static inline int post_send(struct ipoib_dev_priv *priv, 691 struct ipoib_cm_tx *tx, 692 unsigned int wr_id, 693 u64 addr, int len) 694 { 695 struct ib_send_wr *bad_wr; 696 697 priv->tx_sge[0].addr = addr; 698 priv->tx_sge[0].length = len; 699 700 priv->tx_wr.num_sge = 1; 701 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 702 703 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 704 } 705 706 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 707 { 708 struct ipoib_dev_priv *priv = netdev_priv(dev); 709 struct ipoib_cm_tx_buf *tx_req; 710 u64 addr; 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 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 743 addr, skb->len))) { 744 ipoib_warn(priv, "post_send failed\n"); 745 ++dev->stats.tx_errors; 746 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 747 dev_kfree_skb_any(skb); 748 } else { 749 dev->trans_start = jiffies; 750 ++tx->tx_head; 751 752 if (++priv->tx_outstanding == ipoib_sendq_size) { 753 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 754 tx->qp->qp_num); 755 netif_stop_queue(dev); 756 } 757 } 758 } 759 760 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 761 { 762 struct ipoib_dev_priv *priv = netdev_priv(dev); 763 struct ipoib_cm_tx *tx = wc->qp->qp_context; 764 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 765 struct ipoib_cm_tx_buf *tx_req; 766 unsigned long flags; 767 768 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 769 wr_id, wc->status); 770 771 if (unlikely(wr_id >= ipoib_sendq_size)) { 772 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 773 wr_id, ipoib_sendq_size); 774 return; 775 } 776 777 tx_req = &tx->tx_ring[wr_id]; 778 779 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 780 781 /* FIXME: is this right? Shouldn't we only increment on success? */ 782 ++dev->stats.tx_packets; 783 dev->stats.tx_bytes += tx_req->skb->len; 784 785 dev_kfree_skb_any(tx_req->skb); 786 787 netif_tx_lock(dev); 788 789 ++tx->tx_tail; 790 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 791 netif_queue_stopped(dev) && 792 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 793 netif_wake_queue(dev); 794 795 if (wc->status != IB_WC_SUCCESS && 796 wc->status != IB_WC_WR_FLUSH_ERR) { 797 struct ipoib_neigh *neigh; 798 799 ipoib_dbg(priv, "failed cm send event " 800 "(status=%d, wrid=%d vend_err %x)\n", 801 wc->status, wr_id, wc->vendor_err); 802 803 spin_lock_irqsave(&priv->lock, flags); 804 neigh = tx->neigh; 805 806 if (neigh) { 807 neigh->cm = NULL; 808 list_del(&neigh->list); 809 if (neigh->ah) 810 ipoib_put_ah(neigh->ah); 811 ipoib_neigh_free(dev, neigh); 812 813 tx->neigh = NULL; 814 } 815 816 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 817 list_move(&tx->list, &priv->cm.reap_list); 818 queue_work(ipoib_workqueue, &priv->cm.reap_task); 819 } 820 821 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 822 823 spin_unlock_irqrestore(&priv->lock, flags); 824 } 825 826 netif_tx_unlock(dev); 827 } 828 829 int ipoib_cm_dev_open(struct net_device *dev) 830 { 831 struct ipoib_dev_priv *priv = netdev_priv(dev); 832 int ret; 833 834 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 835 return 0; 836 837 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 838 if (IS_ERR(priv->cm.id)) { 839 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 840 ret = PTR_ERR(priv->cm.id); 841 goto err_cm; 842 } 843 844 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 845 0, NULL); 846 if (ret) { 847 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 848 IPOIB_CM_IETF_ID | priv->qp->qp_num); 849 goto err_listen; 850 } 851 852 return 0; 853 854 err_listen: 855 ib_destroy_cm_id(priv->cm.id); 856 err_cm: 857 priv->cm.id = NULL; 858 return ret; 859 } 860 861 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 862 { 863 struct ipoib_dev_priv *priv = netdev_priv(dev); 864 struct ipoib_cm_rx *rx, *n; 865 LIST_HEAD(list); 866 867 spin_lock_irq(&priv->lock); 868 list_splice_init(&priv->cm.rx_reap_list, &list); 869 spin_unlock_irq(&priv->lock); 870 871 list_for_each_entry_safe(rx, n, &list, list) { 872 ib_destroy_cm_id(rx->id); 873 ib_destroy_qp(rx->qp); 874 if (!ipoib_cm_has_srq(dev)) { 875 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 876 spin_lock_irq(&priv->lock); 877 --priv->cm.nonsrq_conn_qp; 878 spin_unlock_irq(&priv->lock); 879 } 880 kfree(rx); 881 } 882 } 883 884 void ipoib_cm_dev_stop(struct net_device *dev) 885 { 886 struct ipoib_dev_priv *priv = netdev_priv(dev); 887 struct ipoib_cm_rx *p; 888 unsigned long begin; 889 int ret; 890 891 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 892 return; 893 894 ib_destroy_cm_id(priv->cm.id); 895 priv->cm.id = NULL; 896 897 spin_lock_irq(&priv->lock); 898 while (!list_empty(&priv->cm.passive_ids)) { 899 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 900 list_move(&p->list, &priv->cm.rx_error_list); 901 p->state = IPOIB_CM_RX_ERROR; 902 spin_unlock_irq(&priv->lock); 903 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 904 if (ret) 905 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 906 spin_lock_irq(&priv->lock); 907 } 908 909 /* Wait for all RX to be drained */ 910 begin = jiffies; 911 912 while (!list_empty(&priv->cm.rx_error_list) || 913 !list_empty(&priv->cm.rx_flush_list) || 914 !list_empty(&priv->cm.rx_drain_list)) { 915 if (time_after(jiffies, begin + 5 * HZ)) { 916 ipoib_warn(priv, "RX drain timing out\n"); 917 918 /* 919 * assume the HW is wedged and just free up everything. 920 */ 921 list_splice_init(&priv->cm.rx_flush_list, 922 &priv->cm.rx_reap_list); 923 list_splice_init(&priv->cm.rx_error_list, 924 &priv->cm.rx_reap_list); 925 list_splice_init(&priv->cm.rx_drain_list, 926 &priv->cm.rx_reap_list); 927 break; 928 } 929 spin_unlock_irq(&priv->lock); 930 msleep(1); 931 ipoib_drain_cq(dev); 932 spin_lock_irq(&priv->lock); 933 } 934 935 spin_unlock_irq(&priv->lock); 936 937 ipoib_cm_free_rx_reap_list(dev); 938 939 cancel_delayed_work(&priv->cm.stale_task); 940 } 941 942 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 943 { 944 struct ipoib_cm_tx *p = cm_id->context; 945 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 946 struct ipoib_cm_data *data = event->private_data; 947 struct sk_buff_head skqueue; 948 struct ib_qp_attr qp_attr; 949 int qp_attr_mask, ret; 950 struct sk_buff *skb; 951 952 p->mtu = be32_to_cpu(data->mtu); 953 954 if (p->mtu <= IPOIB_ENCAP_LEN) { 955 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 956 p->mtu, IPOIB_ENCAP_LEN); 957 return -EINVAL; 958 } 959 960 qp_attr.qp_state = IB_QPS_RTR; 961 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 962 if (ret) { 963 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 964 return ret; 965 } 966 967 qp_attr.rq_psn = 0 /* FIXME */; 968 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 969 if (ret) { 970 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 971 return ret; 972 } 973 974 qp_attr.qp_state = IB_QPS_RTS; 975 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 976 if (ret) { 977 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 978 return ret; 979 } 980 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 981 if (ret) { 982 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 983 return ret; 984 } 985 986 skb_queue_head_init(&skqueue); 987 988 spin_lock_irq(&priv->lock); 989 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 990 if (p->neigh) 991 while ((skb = __skb_dequeue(&p->neigh->queue))) 992 __skb_queue_tail(&skqueue, skb); 993 spin_unlock_irq(&priv->lock); 994 995 while ((skb = __skb_dequeue(&skqueue))) { 996 skb->dev = p->dev; 997 if (dev_queue_xmit(skb)) 998 ipoib_warn(priv, "dev_queue_xmit failed " 999 "to requeue packet\n"); 1000 } 1001 1002 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1003 if (ret) { 1004 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1005 return ret; 1006 } 1007 return 0; 1008 } 1009 1010 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1011 { 1012 struct ipoib_dev_priv *priv = netdev_priv(dev); 1013 struct ib_qp_init_attr attr = { 1014 .send_cq = priv->recv_cq, 1015 .recv_cq = priv->recv_cq, 1016 .srq = priv->cm.srq, 1017 .cap.max_send_wr = ipoib_sendq_size, 1018 .cap.max_send_sge = 1, 1019 .sq_sig_type = IB_SIGNAL_ALL_WR, 1020 .qp_type = IB_QPT_RC, 1021 .qp_context = tx 1022 }; 1023 1024 return ib_create_qp(priv->pd, &attr); 1025 } 1026 1027 static int ipoib_cm_send_req(struct net_device *dev, 1028 struct ib_cm_id *id, struct ib_qp *qp, 1029 u32 qpn, 1030 struct ib_sa_path_rec *pathrec) 1031 { 1032 struct ipoib_dev_priv *priv = netdev_priv(dev); 1033 struct ipoib_cm_data data = {}; 1034 struct ib_cm_req_param req = {}; 1035 1036 data.qpn = cpu_to_be32(priv->qp->qp_num); 1037 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1038 1039 req.primary_path = pathrec; 1040 req.alternate_path = NULL; 1041 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1042 req.qp_num = qp->qp_num; 1043 req.qp_type = qp->qp_type; 1044 req.private_data = &data; 1045 req.private_data_len = sizeof data; 1046 req.flow_control = 0; 1047 1048 req.starting_psn = 0; /* FIXME */ 1049 1050 /* 1051 * Pick some arbitrary defaults here; we could make these 1052 * module parameters if anyone cared about setting them. 1053 */ 1054 req.responder_resources = 4; 1055 req.remote_cm_response_timeout = 20; 1056 req.local_cm_response_timeout = 20; 1057 req.retry_count = 0; /* RFC draft warns against retries */ 1058 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1059 req.max_cm_retries = 15; 1060 req.srq = ipoib_cm_has_srq(dev); 1061 return ib_send_cm_req(id, &req); 1062 } 1063 1064 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1065 struct ib_cm_id *cm_id, struct ib_qp *qp) 1066 { 1067 struct ipoib_dev_priv *priv = netdev_priv(dev); 1068 struct ib_qp_attr qp_attr; 1069 int qp_attr_mask, ret; 1070 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1071 if (ret) { 1072 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1073 return ret; 1074 } 1075 1076 qp_attr.qp_state = IB_QPS_INIT; 1077 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1078 qp_attr.port_num = priv->port; 1079 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1080 1081 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1082 if (ret) { 1083 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1084 return ret; 1085 } 1086 return 0; 1087 } 1088 1089 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1090 struct ib_sa_path_rec *pathrec) 1091 { 1092 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1093 int ret; 1094 1095 p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring); 1096 if (!p->tx_ring) { 1097 ipoib_warn(priv, "failed to allocate tx ring\n"); 1098 ret = -ENOMEM; 1099 goto err_tx; 1100 } 1101 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1102 1103 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1104 if (IS_ERR(p->qp)) { 1105 ret = PTR_ERR(p->qp); 1106 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1107 goto err_qp; 1108 } 1109 1110 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1111 if (IS_ERR(p->id)) { 1112 ret = PTR_ERR(p->id); 1113 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1114 goto err_id; 1115 } 1116 1117 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1118 if (ret) { 1119 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1120 goto err_modify; 1121 } 1122 1123 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1124 if (ret) { 1125 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1126 goto err_send_cm; 1127 } 1128 1129 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1130 p->qp->qp_num, pathrec->dgid.raw, qpn); 1131 1132 return 0; 1133 1134 err_send_cm: 1135 err_modify: 1136 ib_destroy_cm_id(p->id); 1137 err_id: 1138 p->id = NULL; 1139 ib_destroy_qp(p->qp); 1140 err_qp: 1141 p->qp = NULL; 1142 vfree(p->tx_ring); 1143 err_tx: 1144 return ret; 1145 } 1146 1147 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1148 { 1149 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1150 struct ipoib_cm_tx_buf *tx_req; 1151 unsigned long begin; 1152 1153 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1154 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1155 1156 if (p->id) 1157 ib_destroy_cm_id(p->id); 1158 1159 if (p->tx_ring) { 1160 /* Wait for all sends to complete */ 1161 begin = jiffies; 1162 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1163 if (time_after(jiffies, begin + 5 * HZ)) { 1164 ipoib_warn(priv, "timing out; %d sends not completed\n", 1165 p->tx_head - p->tx_tail); 1166 goto timeout; 1167 } 1168 1169 msleep(1); 1170 } 1171 } 1172 1173 timeout: 1174 1175 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1176 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1177 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1178 DMA_TO_DEVICE); 1179 dev_kfree_skb_any(tx_req->skb); 1180 ++p->tx_tail; 1181 netif_tx_lock_bh(p->dev); 1182 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1183 netif_queue_stopped(p->dev) && 1184 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1185 netif_wake_queue(p->dev); 1186 netif_tx_unlock_bh(p->dev); 1187 } 1188 1189 if (p->qp) 1190 ib_destroy_qp(p->qp); 1191 1192 vfree(p->tx_ring); 1193 kfree(p); 1194 } 1195 1196 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1197 struct ib_cm_event *event) 1198 { 1199 struct ipoib_cm_tx *tx = cm_id->context; 1200 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1201 struct net_device *dev = priv->dev; 1202 struct ipoib_neigh *neigh; 1203 unsigned long flags; 1204 int ret; 1205 1206 switch (event->event) { 1207 case IB_CM_DREQ_RECEIVED: 1208 ipoib_dbg(priv, "DREQ received.\n"); 1209 ib_send_cm_drep(cm_id, NULL, 0); 1210 break; 1211 case IB_CM_REP_RECEIVED: 1212 ipoib_dbg(priv, "REP received.\n"); 1213 ret = ipoib_cm_rep_handler(cm_id, event); 1214 if (ret) 1215 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1216 NULL, 0, NULL, 0); 1217 break; 1218 case IB_CM_REQ_ERROR: 1219 case IB_CM_REJ_RECEIVED: 1220 case IB_CM_TIMEWAIT_EXIT: 1221 ipoib_dbg(priv, "CM error %d.\n", event->event); 1222 netif_tx_lock_bh(dev); 1223 spin_lock_irqsave(&priv->lock, flags); 1224 neigh = tx->neigh; 1225 1226 if (neigh) { 1227 neigh->cm = NULL; 1228 list_del(&neigh->list); 1229 if (neigh->ah) 1230 ipoib_put_ah(neigh->ah); 1231 ipoib_neigh_free(dev, neigh); 1232 1233 tx->neigh = NULL; 1234 } 1235 1236 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1237 list_move(&tx->list, &priv->cm.reap_list); 1238 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1239 } 1240 1241 spin_unlock_irqrestore(&priv->lock, flags); 1242 netif_tx_unlock_bh(dev); 1243 break; 1244 default: 1245 break; 1246 } 1247 1248 return 0; 1249 } 1250 1251 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1252 struct ipoib_neigh *neigh) 1253 { 1254 struct ipoib_dev_priv *priv = netdev_priv(dev); 1255 struct ipoib_cm_tx *tx; 1256 1257 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1258 if (!tx) 1259 return NULL; 1260 1261 neigh->cm = tx; 1262 tx->neigh = neigh; 1263 tx->path = path; 1264 tx->dev = dev; 1265 list_add(&tx->list, &priv->cm.start_list); 1266 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1267 queue_work(ipoib_workqueue, &priv->cm.start_task); 1268 return tx; 1269 } 1270 1271 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1272 { 1273 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1274 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1275 list_move(&tx->list, &priv->cm.reap_list); 1276 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1277 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1278 tx->neigh->dgid.raw); 1279 tx->neigh = NULL; 1280 } 1281 } 1282 1283 static void ipoib_cm_tx_start(struct work_struct *work) 1284 { 1285 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1286 cm.start_task); 1287 struct net_device *dev = priv->dev; 1288 struct ipoib_neigh *neigh; 1289 struct ipoib_cm_tx *p; 1290 unsigned long flags; 1291 int ret; 1292 1293 struct ib_sa_path_rec pathrec; 1294 u32 qpn; 1295 1296 netif_tx_lock_bh(dev); 1297 spin_lock_irqsave(&priv->lock, flags); 1298 1299 while (!list_empty(&priv->cm.start_list)) { 1300 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1301 list_del_init(&p->list); 1302 neigh = p->neigh; 1303 qpn = IPOIB_QPN(neigh->neighbour->ha); 1304 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1305 1306 spin_unlock_irqrestore(&priv->lock, flags); 1307 netif_tx_unlock_bh(dev); 1308 1309 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1310 1311 netif_tx_lock_bh(dev); 1312 spin_lock_irqsave(&priv->lock, flags); 1313 1314 if (ret) { 1315 neigh = p->neigh; 1316 if (neigh) { 1317 neigh->cm = NULL; 1318 list_del(&neigh->list); 1319 if (neigh->ah) 1320 ipoib_put_ah(neigh->ah); 1321 ipoib_neigh_free(dev, neigh); 1322 } 1323 list_del(&p->list); 1324 kfree(p); 1325 } 1326 } 1327 1328 spin_unlock_irqrestore(&priv->lock, flags); 1329 netif_tx_unlock_bh(dev); 1330 } 1331 1332 static void ipoib_cm_tx_reap(struct work_struct *work) 1333 { 1334 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1335 cm.reap_task); 1336 struct net_device *dev = priv->dev; 1337 struct ipoib_cm_tx *p; 1338 unsigned long flags; 1339 1340 netif_tx_lock_bh(dev); 1341 spin_lock_irqsave(&priv->lock, flags); 1342 1343 while (!list_empty(&priv->cm.reap_list)) { 1344 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1345 list_del(&p->list); 1346 spin_unlock_irqrestore(&priv->lock, flags); 1347 netif_tx_unlock_bh(dev); 1348 ipoib_cm_tx_destroy(p); 1349 netif_tx_lock_bh(dev); 1350 spin_lock_irqsave(&priv->lock, flags); 1351 } 1352 1353 spin_unlock_irqrestore(&priv->lock, flags); 1354 netif_tx_unlock_bh(dev); 1355 } 1356 1357 static void ipoib_cm_skb_reap(struct work_struct *work) 1358 { 1359 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1360 cm.skb_task); 1361 struct net_device *dev = priv->dev; 1362 struct sk_buff *skb; 1363 unsigned long flags; 1364 unsigned mtu = priv->mcast_mtu; 1365 1366 netif_tx_lock_bh(dev); 1367 spin_lock_irqsave(&priv->lock, flags); 1368 1369 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1370 spin_unlock_irqrestore(&priv->lock, flags); 1371 netif_tx_unlock_bh(dev); 1372 1373 if (skb->protocol == htons(ETH_P_IP)) 1374 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1375 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1376 else if (skb->protocol == htons(ETH_P_IPV6)) 1377 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev); 1378 #endif 1379 dev_kfree_skb_any(skb); 1380 1381 netif_tx_lock_bh(dev); 1382 spin_lock_irqsave(&priv->lock, flags); 1383 } 1384 1385 spin_unlock_irqrestore(&priv->lock, flags); 1386 netif_tx_unlock_bh(dev); 1387 } 1388 1389 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1390 unsigned int mtu) 1391 { 1392 struct ipoib_dev_priv *priv = netdev_priv(dev); 1393 int e = skb_queue_empty(&priv->cm.skb_queue); 1394 1395 if (skb_dst(skb)) 1396 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); 1397 1398 skb_queue_tail(&priv->cm.skb_queue, skb); 1399 if (e) 1400 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1401 } 1402 1403 static void ipoib_cm_rx_reap(struct work_struct *work) 1404 { 1405 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1406 cm.rx_reap_task)->dev); 1407 } 1408 1409 static void ipoib_cm_stale_task(struct work_struct *work) 1410 { 1411 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1412 cm.stale_task.work); 1413 struct ipoib_cm_rx *p; 1414 int ret; 1415 1416 spin_lock_irq(&priv->lock); 1417 while (!list_empty(&priv->cm.passive_ids)) { 1418 /* List is sorted by LRU, start from tail, 1419 * stop when we see a recently used entry */ 1420 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1421 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1422 break; 1423 list_move(&p->list, &priv->cm.rx_error_list); 1424 p->state = IPOIB_CM_RX_ERROR; 1425 spin_unlock_irq(&priv->lock); 1426 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1427 if (ret) 1428 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1429 spin_lock_irq(&priv->lock); 1430 } 1431 1432 if (!list_empty(&priv->cm.passive_ids)) 1433 queue_delayed_work(ipoib_workqueue, 1434 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1435 spin_unlock_irq(&priv->lock); 1436 } 1437 1438 1439 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1440 char *buf) 1441 { 1442 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1443 1444 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1445 return sprintf(buf, "connected\n"); 1446 else 1447 return sprintf(buf, "datagram\n"); 1448 } 1449 1450 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1451 const char *buf, size_t count) 1452 { 1453 struct net_device *dev = to_net_dev(d); 1454 struct ipoib_dev_priv *priv = netdev_priv(dev); 1455 1456 if (!rtnl_trylock()) 1457 return restart_syscall(); 1458 1459 /* flush paths if we switch modes so that connections are restarted */ 1460 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1461 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1462 ipoib_warn(priv, "enabling connected mode " 1463 "will cause multicast packet drops\n"); 1464 1465 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO); 1466 rtnl_unlock(); 1467 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 1468 1469 ipoib_flush_paths(dev); 1470 return count; 1471 } 1472 1473 if (!strcmp(buf, "datagram\n")) { 1474 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1475 1476 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) { 1477 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG; 1478 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1479 dev->features |= NETIF_F_TSO; 1480 } 1481 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 1482 rtnl_unlock(); 1483 ipoib_flush_paths(dev); 1484 1485 return count; 1486 } 1487 rtnl_unlock(); 1488 1489 return -EINVAL; 1490 } 1491 1492 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1493 1494 int ipoib_cm_add_mode_attr(struct net_device *dev) 1495 { 1496 return device_create_file(&dev->dev, &dev_attr_mode); 1497 } 1498 1499 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1500 { 1501 struct ipoib_dev_priv *priv = netdev_priv(dev); 1502 struct ib_srq_init_attr srq_init_attr = { 1503 .attr = { 1504 .max_wr = ipoib_recvq_size, 1505 .max_sge = max_sge 1506 } 1507 }; 1508 1509 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1510 if (IS_ERR(priv->cm.srq)) { 1511 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1512 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1513 priv->ca->name, PTR_ERR(priv->cm.srq)); 1514 priv->cm.srq = NULL; 1515 return; 1516 } 1517 1518 priv->cm.srq_ring = vmalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1519 if (!priv->cm.srq_ring) { 1520 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1521 priv->ca->name, ipoib_recvq_size); 1522 ib_destroy_srq(priv->cm.srq); 1523 priv->cm.srq = NULL; 1524 return; 1525 } 1526 1527 memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1528 } 1529 1530 int ipoib_cm_dev_init(struct net_device *dev) 1531 { 1532 struct ipoib_dev_priv *priv = netdev_priv(dev); 1533 int i, ret; 1534 struct ib_device_attr attr; 1535 1536 INIT_LIST_HEAD(&priv->cm.passive_ids); 1537 INIT_LIST_HEAD(&priv->cm.reap_list); 1538 INIT_LIST_HEAD(&priv->cm.start_list); 1539 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1540 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1541 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1542 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1543 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1544 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1545 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1546 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1547 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1548 1549 skb_queue_head_init(&priv->cm.skb_queue); 1550 1551 ret = ib_query_device(priv->ca, &attr); 1552 if (ret) { 1553 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1554 return ret; 1555 } 1556 1557 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1558 1559 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1560 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1561 if (ipoib_cm_has_srq(dev)) { 1562 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1563 priv->cm.num_frags = attr.max_srq_sge; 1564 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1565 priv->cm.max_cm_mtu, priv->cm.num_frags); 1566 } else { 1567 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1568 priv->cm.num_frags = IPOIB_CM_RX_SG; 1569 } 1570 1571 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1572 1573 if (ipoib_cm_has_srq(dev)) { 1574 for (i = 0; i < ipoib_recvq_size; ++i) { 1575 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1576 priv->cm.num_frags - 1, 1577 priv->cm.srq_ring[i].mapping)) { 1578 ipoib_warn(priv, "failed to allocate " 1579 "receive buffer %d\n", i); 1580 ipoib_cm_dev_cleanup(dev); 1581 return -ENOMEM; 1582 } 1583 1584 if (ipoib_cm_post_receive_srq(dev, i)) { 1585 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1586 "failed for buf %d\n", i); 1587 ipoib_cm_dev_cleanup(dev); 1588 return -EIO; 1589 } 1590 } 1591 } 1592 1593 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1594 return 0; 1595 } 1596 1597 void ipoib_cm_dev_cleanup(struct net_device *dev) 1598 { 1599 struct ipoib_dev_priv *priv = netdev_priv(dev); 1600 int ret; 1601 1602 if (!priv->cm.srq) 1603 return; 1604 1605 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1606 1607 ret = ib_destroy_srq(priv->cm.srq); 1608 if (ret) 1609 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1610 1611 priv->cm.srq = NULL; 1612 if (!priv->cm.srq_ring) 1613 return; 1614 1615 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1616 priv->cm.srq_ring = NULL; 1617 } 1618