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#include <linux/moduleparam.h> 41 42#include "ipoib.h" 43 44int ipoib_max_conn_qp = 128; 45 46module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 47MODULE_PARM_DESC(max_nonsrq_conn_qp, 48 "Max number of connected-mode QPs per interface " 49 "(applied only if shared receive queue is not available)"); 50 51#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 52static int data_debug_level; 53 54module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 55MODULE_PARM_DESC(cm_data_debug_level, 56 "Enable data path debug tracing for connected mode if > 0"); 57#endif 58 59#define IPOIB_CM_IETF_ID 0x1000000000000000ULL 60 61#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 62#define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 63#define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 64#define IPOIB_CM_RX_UPDATE_MASK (0x3) 65 66static struct ib_qp_attr ipoib_cm_err_attr = { 67 .qp_state = IB_QPS_ERR 68}; 69 70#define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 71 72static struct ib_send_wr ipoib_cm_rx_drain_wr = { 73 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 74 .opcode = IB_WR_SEND, 75}; 76 77static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 78 struct ib_cm_event *event); 79 80static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 81 u64 mapping[IPOIB_CM_RX_SG]) 82{ 83 int i; 84 85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 86 87 for (i = 0; i < frags; ++i) 88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 89} 90 91static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 92{ 93 struct ipoib_dev_priv *priv = netdev_priv(dev); 94 struct ib_recv_wr *bad_wr; 95 int i, ret; 96 97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 98 99 for (i = 0; i < priv->cm.num_frags; ++i) 100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 101 102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 103 if (unlikely(ret)) { 104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 106 priv->cm.srq_ring[id].mapping); 107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 108 priv->cm.srq_ring[id].skb = NULL; 109 } 110 111 return ret; 112} 113 114static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 115 struct ipoib_cm_rx *rx, 116 struct ib_recv_wr *wr, 117 struct ib_sge *sge, int id) 118{ 119 struct ipoib_dev_priv *priv = netdev_priv(dev); 120 struct ib_recv_wr *bad_wr; 121 int i, ret; 122 123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 124 125 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 126 sge[i].addr = rx->rx_ring[id].mapping[i]; 127 128 ret = ib_post_recv(rx->qp, wr, &bad_wr); 129 if (unlikely(ret)) { 130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 132 rx->rx_ring[id].mapping); 133 dev_kfree_skb_any(rx->rx_ring[id].skb); 134 rx->rx_ring[id].skb = NULL; 135 } 136 137 return ret; 138} 139 140static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 141 struct ipoib_cm_rx_buf *rx_ring, 142 int id, int frags, 143 u64 mapping[IPOIB_CM_RX_SG]) 144{ 145 struct ipoib_dev_priv *priv = netdev_priv(dev); 146 struct sk_buff *skb; 147 int i; 148 149 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 150 if (unlikely(!skb)) 151 return NULL; 152 153 /* 154 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 155 * IP header to a multiple of 16. 156 */ 157 skb_reserve(skb, 12); 158 159 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 160 DMA_FROM_DEVICE); 161 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 162 dev_kfree_skb_any(skb); 163 return NULL; 164 } 165 166 for (i = 0; i < frags; i++) { 167 struct page *page = alloc_page(GFP_ATOMIC); 168 169 if (!page) 170 goto partial_error; 171 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 172 173 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 174 0, PAGE_SIZE, DMA_FROM_DEVICE); 175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 176 goto partial_error; 177 } 178 179 rx_ring[id].skb = skb; 180 return skb; 181 182partial_error: 183 184 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 185 186 for (; i > 0; --i) 187 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 188 189 dev_kfree_skb_any(skb); 190 return NULL; 191} 192 193static void ipoib_cm_free_rx_ring(struct net_device *dev, 194 struct ipoib_cm_rx_buf *rx_ring) 195{ 196 struct ipoib_dev_priv *priv = netdev_priv(dev); 197 int i; 198 199 for (i = 0; i < ipoib_recvq_size; ++i) 200 if (rx_ring[i].skb) { 201 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 202 rx_ring[i].mapping); 203 dev_kfree_skb_any(rx_ring[i].skb); 204 } 205 206 vfree(rx_ring); 207} 208 209static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 210{ 211 struct ib_send_wr *bad_wr; 212 struct ipoib_cm_rx *p; 213 214 /* We only reserved 1 extra slot in CQ for drain WRs, so 215 * make sure we have at most 1 outstanding WR. */ 216 if (list_empty(&priv->cm.rx_flush_list) || 217 !list_empty(&priv->cm.rx_drain_list)) 218 return; 219 220 /* 221 * QPs on flush list are error state. This way, a "flush 222 * error" WC will be immediately generated for each WR we post. 223 */ 224 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 225 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 226 ipoib_warn(priv, "failed to post drain wr\n"); 227 228 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 229} 230 231static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 232{ 233 struct ipoib_cm_rx *p = ctx; 234 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 235 unsigned long flags; 236 237 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 238 return; 239 240 spin_lock_irqsave(&priv->lock, flags); 241 list_move(&p->list, &priv->cm.rx_flush_list); 242 p->state = IPOIB_CM_RX_FLUSH; 243 ipoib_cm_start_rx_drain(priv); 244 spin_unlock_irqrestore(&priv->lock, flags); 245} 246 247static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 248 struct ipoib_cm_rx *p) 249{ 250 struct ipoib_dev_priv *priv = netdev_priv(dev); 251 struct ib_qp_init_attr attr = { 252 .event_handler = ipoib_cm_rx_event_handler, 253 .send_cq = priv->recv_cq, /* For drain WR */ 254 .recv_cq = priv->recv_cq, 255 .srq = priv->cm.srq, 256 .cap.max_send_wr = 1, /* For drain WR */ 257 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 258 .sq_sig_type = IB_SIGNAL_ALL_WR, 259 .qp_type = IB_QPT_RC, 260 .qp_context = p, 261 }; 262 263 if (!ipoib_cm_has_srq(dev)) { 264 attr.cap.max_recv_wr = ipoib_recvq_size; 265 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 266 } 267 268 return ib_create_qp(priv->pd, &attr); 269} 270 271static int ipoib_cm_modify_rx_qp(struct net_device *dev, 272 struct ib_cm_id *cm_id, struct ib_qp *qp, 273 unsigned psn) 274{ 275 struct ipoib_dev_priv *priv = netdev_priv(dev); 276 struct ib_qp_attr qp_attr; 277 int qp_attr_mask, ret; 278 279 qp_attr.qp_state = IB_QPS_INIT; 280 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 281 if (ret) { 282 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 283 return ret; 284 } 285 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 286 if (ret) { 287 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 288 return ret; 289 } 290 qp_attr.qp_state = IB_QPS_RTR; 291 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 292 if (ret) { 293 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 294 return ret; 295 } 296 qp_attr.rq_psn = psn; 297 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 298 if (ret) { 299 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 300 return ret; 301 } 302 303 /* 304 * Current Mellanox HCA firmware won't generate completions 305 * with error for drain WRs unless the QP has been moved to 306 * RTS first. This work-around leaves a window where a QP has 307 * moved to error asynchronously, but this will eventually get 308 * fixed in firmware, so let's not error out if modify QP 309 * fails. 310 */ 311 qp_attr.qp_state = IB_QPS_RTS; 312 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 313 if (ret) { 314 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 315 return 0; 316 } 317 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 318 if (ret) { 319 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 320 return 0; 321 } 322 323 return 0; 324} 325 326static void ipoib_cm_init_rx_wr(struct net_device *dev, 327 struct ib_recv_wr *wr, 328 struct ib_sge *sge) 329{ 330 struct ipoib_dev_priv *priv = netdev_priv(dev); 331 int i; 332 333 for (i = 0; i < priv->cm.num_frags; ++i) 334 sge[i].lkey = priv->mr->lkey; 335 336 sge[0].length = IPOIB_CM_HEAD_SIZE; 337 for (i = 1; i < priv->cm.num_frags; ++i) 338 sge[i].length = PAGE_SIZE; 339 340 wr->next = NULL; 341 wr->sg_list = sge; 342 wr->num_sge = priv->cm.num_frags; 343} 344 345static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 346 struct ipoib_cm_rx *rx) 347{ 348 struct ipoib_dev_priv *priv = netdev_priv(dev); 349 struct { 350 struct ib_recv_wr wr; 351 struct ib_sge sge[IPOIB_CM_RX_SG]; 352 } *t; 353 int ret; 354 int i; 355 356 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 357 if (!rx->rx_ring) { 358 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 359 priv->ca->name, ipoib_recvq_size); 360 return -ENOMEM; 361 } 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 405err_count: 406 spin_lock_irq(&priv->lock); 407 --priv->cm.nonsrq_conn_qp; 408 spin_unlock_irq(&priv->lock); 409 410err_free: 411 kfree(t); 412 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 413 414 return ret; 415} 416 417static 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 438static 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 492err_modify: 493 ib_destroy_qp(p->qp); 494err_qp: 495 kfree(p); 496 return ret; 497} 498 499static 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 */ 523static 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, skb_frag_page(frag), 542 0, PAGE_SIZE); 543 --skb_shinfo(skb)->nr_frags; 544 } else { 545 size = min(length, (unsigned) PAGE_SIZE); 546 547 skb_frag_size_set(frag, size); 548 skb->data_len += size; 549 skb->truesize += size; 550 skb->len += size; 551 length -= size; 552 } 553 } 554} 555 556void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 557{ 558 struct ipoib_dev_priv *priv = netdev_priv(dev); 559 struct ipoib_cm_rx_buf *rx_ring; 560 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 561 struct sk_buff *skb, *newskb; 562 struct ipoib_cm_rx *p; 563 unsigned long flags; 564 u64 mapping[IPOIB_CM_RX_SG]; 565 int frags; 566 int has_srq; 567 struct sk_buff *small_skb; 568 569 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 570 wr_id, wc->status); 571 572 if (unlikely(wr_id >= ipoib_recvq_size)) { 573 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 574 spin_lock_irqsave(&priv->lock, flags); 575 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 576 ipoib_cm_start_rx_drain(priv); 577 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 578 spin_unlock_irqrestore(&priv->lock, flags); 579 } else 580 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 581 wr_id, ipoib_recvq_size); 582 return; 583 } 584 585 p = wc->qp->qp_context; 586 587 has_srq = ipoib_cm_has_srq(dev); 588 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 589 590 skb = rx_ring[wr_id].skb; 591 592 if (unlikely(wc->status != IB_WC_SUCCESS)) { 593 ipoib_dbg(priv, "cm recv error " 594 "(status=%d, wrid=%d vend_err %x)\n", 595 wc->status, wr_id, wc->vendor_err); 596 ++dev->stats.rx_dropped; 597 if (has_srq) 598 goto repost; 599 else { 600 if (!--p->recv_count) { 601 spin_lock_irqsave(&priv->lock, flags); 602 list_move(&p->list, &priv->cm.rx_reap_list); 603 spin_unlock_irqrestore(&priv->lock, flags); 604 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 605 } 606 return; 607 } 608 } 609 610 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 611 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 612 spin_lock_irqsave(&priv->lock, flags); 613 p->jiffies = jiffies; 614 /* Move this entry to list head, but do not re-add it 615 * if it has been moved out of list. */ 616 if (p->state == IPOIB_CM_RX_LIVE) 617 list_move(&p->list, &priv->cm.passive_ids); 618 spin_unlock_irqrestore(&priv->lock, flags); 619 } 620 } 621 622 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 623 int dlen = wc->byte_len; 624 625 small_skb = dev_alloc_skb(dlen + 12); 626 if (small_skb) { 627 skb_reserve(small_skb, 12); 628 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 629 dlen, DMA_FROM_DEVICE); 630 skb_copy_from_linear_data(skb, small_skb->data, dlen); 631 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 632 dlen, DMA_FROM_DEVICE); 633 skb_put(small_skb, dlen); 634 skb = small_skb; 635 goto copied; 636 } 637 } 638 639 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 640 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 641 642 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 643 if (unlikely(!newskb)) { 644 /* 645 * If we can't allocate a new RX buffer, dump 646 * this packet and reuse the old buffer. 647 */ 648 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 649 ++dev->stats.rx_dropped; 650 goto repost; 651 } 652 653 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 654 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 655 656 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 657 wc->byte_len, wc->slid); 658 659 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 660 661copied: 662 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 663 skb_reset_mac_header(skb); 664 skb_pull(skb, IPOIB_ENCAP_LEN); 665 666 ++dev->stats.rx_packets; 667 dev->stats.rx_bytes += skb->len; 668 669 skb->dev = dev; 670 /* XXX get correct PACKET_ type here */ 671 skb->pkt_type = PACKET_HOST; 672 netif_receive_skb(skb); 673 674repost: 675 if (has_srq) { 676 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 677 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 678 "for buf %d\n", wr_id); 679 } else { 680 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 681 &priv->cm.rx_wr, 682 priv->cm.rx_sge, 683 wr_id))) { 684 --p->recv_count; 685 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 686 "for buf %d\n", wr_id); 687 } 688 } 689} 690 691static inline int post_send(struct ipoib_dev_priv *priv, 692 struct ipoib_cm_tx *tx, 693 unsigned int wr_id, 694 u64 addr, int len) 695{ 696 struct ib_send_wr *bad_wr; 697 698 priv->tx_sge[0].addr = addr; 699 priv->tx_sge[0].length = len; 700 701 priv->tx_wr.num_sge = 1; 702 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 703 704 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 705} 706 707void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 708{ 709 struct ipoib_dev_priv *priv = netdev_priv(dev); 710 struct ipoib_cm_tx_buf *tx_req; 711 u64 addr; 712 int rc; 713 714 if (unlikely(skb->len > tx->mtu)) { 715 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 716 skb->len, tx->mtu); 717 ++dev->stats.tx_dropped; 718 ++dev->stats.tx_errors; 719 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 720 return; 721 } 722 723 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 724 tx->tx_head, skb->len, tx->qp->qp_num); 725 726 /* 727 * We put the skb into the tx_ring _before_ we call post_send() 728 * because it's entirely possible that the completion handler will 729 * run before we execute anything after the post_send(). That 730 * means we have to make sure everything is properly recorded and 731 * our state is consistent before we call post_send(). 732 */ 733 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 734 tx_req->skb = skb; 735 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 736 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 737 ++dev->stats.tx_errors; 738 dev_kfree_skb_any(skb); 739 return; 740 } 741 742 tx_req->mapping = addr; 743 744 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 745 addr, skb->len); 746 if (unlikely(rc)) { 747 ipoib_warn(priv, "post_send failed, error %d\n", rc); 748 ++dev->stats.tx_errors; 749 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 750 dev_kfree_skb_any(skb); 751 } else { 752 dev->trans_start = jiffies; 753 ++tx->tx_head; 754 755 if (++priv->tx_outstanding == ipoib_sendq_size) { 756 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 757 tx->qp->qp_num); 758 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 759 ipoib_warn(priv, "request notify on send CQ failed\n"); 760 netif_stop_queue(dev); 761 } 762 } 763} 764 765void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 766{ 767 struct ipoib_dev_priv *priv = netdev_priv(dev); 768 struct ipoib_cm_tx *tx = wc->qp->qp_context; 769 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 770 struct ipoib_cm_tx_buf *tx_req; 771 unsigned long flags; 772 773 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 774 wr_id, wc->status); 775 776 if (unlikely(wr_id >= ipoib_sendq_size)) { 777 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 778 wr_id, ipoib_sendq_size); 779 return; 780 } 781 782 tx_req = &tx->tx_ring[wr_id]; 783 784 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 785 786 /* FIXME: is this right? Shouldn't we only increment on success? */ 787 ++dev->stats.tx_packets; 788 dev->stats.tx_bytes += tx_req->skb->len; 789 790 dev_kfree_skb_any(tx_req->skb); 791 792 netif_tx_lock(dev); 793 794 ++tx->tx_tail; 795 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 796 netif_queue_stopped(dev) && 797 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 798 netif_wake_queue(dev); 799 800 if (wc->status != IB_WC_SUCCESS && 801 wc->status != IB_WC_WR_FLUSH_ERR) { 802 struct ipoib_neigh *neigh; 803 804 ipoib_dbg(priv, "failed cm send event " 805 "(status=%d, wrid=%d vend_err %x)\n", 806 wc->status, wr_id, wc->vendor_err); 807 808 spin_lock_irqsave(&priv->lock, flags); 809 neigh = tx->neigh; 810 811 if (neigh) { 812 neigh->cm = NULL; 813 list_del(&neigh->list); 814 if (neigh->ah) 815 ipoib_put_ah(neigh->ah); 816 ipoib_neigh_free(dev, neigh); 817 818 tx->neigh = NULL; 819 } 820 821 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 822 list_move(&tx->list, &priv->cm.reap_list); 823 queue_work(ipoib_workqueue, &priv->cm.reap_task); 824 } 825 826 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 827 828 spin_unlock_irqrestore(&priv->lock, flags); 829 } 830 831 netif_tx_unlock(dev); 832} 833 834int ipoib_cm_dev_open(struct net_device *dev) 835{ 836 struct ipoib_dev_priv *priv = netdev_priv(dev); 837 int ret; 838 839 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 840 return 0; 841 842 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 843 if (IS_ERR(priv->cm.id)) { 844 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 845 ret = PTR_ERR(priv->cm.id); 846 goto err_cm; 847 } 848 849 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 850 0, NULL); 851 if (ret) { 852 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 853 IPOIB_CM_IETF_ID | priv->qp->qp_num); 854 goto err_listen; 855 } 856 857 return 0; 858 859err_listen: 860 ib_destroy_cm_id(priv->cm.id); 861err_cm: 862 priv->cm.id = NULL; 863 return ret; 864} 865 866static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 867{ 868 struct ipoib_dev_priv *priv = netdev_priv(dev); 869 struct ipoib_cm_rx *rx, *n; 870 LIST_HEAD(list); 871 872 spin_lock_irq(&priv->lock); 873 list_splice_init(&priv->cm.rx_reap_list, &list); 874 spin_unlock_irq(&priv->lock); 875 876 list_for_each_entry_safe(rx, n, &list, list) { 877 ib_destroy_cm_id(rx->id); 878 ib_destroy_qp(rx->qp); 879 if (!ipoib_cm_has_srq(dev)) { 880 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 881 spin_lock_irq(&priv->lock); 882 --priv->cm.nonsrq_conn_qp; 883 spin_unlock_irq(&priv->lock); 884 } 885 kfree(rx); 886 } 887} 888 889void ipoib_cm_dev_stop(struct net_device *dev) 890{ 891 struct ipoib_dev_priv *priv = netdev_priv(dev); 892 struct ipoib_cm_rx *p; 893 unsigned long begin; 894 int ret; 895 896 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 897 return; 898 899 ib_destroy_cm_id(priv->cm.id); 900 priv->cm.id = NULL; 901 902 spin_lock_irq(&priv->lock); 903 while (!list_empty(&priv->cm.passive_ids)) { 904 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 905 list_move(&p->list, &priv->cm.rx_error_list); 906 p->state = IPOIB_CM_RX_ERROR; 907 spin_unlock_irq(&priv->lock); 908 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 909 if (ret) 910 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 911 spin_lock_irq(&priv->lock); 912 } 913 914 /* Wait for all RX to be drained */ 915 begin = jiffies; 916 917 while (!list_empty(&priv->cm.rx_error_list) || 918 !list_empty(&priv->cm.rx_flush_list) || 919 !list_empty(&priv->cm.rx_drain_list)) { 920 if (time_after(jiffies, begin + 5 * HZ)) { 921 ipoib_warn(priv, "RX drain timing out\n"); 922 923 /* 924 * assume the HW is wedged and just free up everything. 925 */ 926 list_splice_init(&priv->cm.rx_flush_list, 927 &priv->cm.rx_reap_list); 928 list_splice_init(&priv->cm.rx_error_list, 929 &priv->cm.rx_reap_list); 930 list_splice_init(&priv->cm.rx_drain_list, 931 &priv->cm.rx_reap_list); 932 break; 933 } 934 spin_unlock_irq(&priv->lock); 935 msleep(1); 936 ipoib_drain_cq(dev); 937 spin_lock_irq(&priv->lock); 938 } 939 940 spin_unlock_irq(&priv->lock); 941 942 ipoib_cm_free_rx_reap_list(dev); 943 944 cancel_delayed_work(&priv->cm.stale_task); 945} 946 947static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 948{ 949 struct ipoib_cm_tx *p = cm_id->context; 950 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 951 struct ipoib_cm_data *data = event->private_data; 952 struct sk_buff_head skqueue; 953 struct ib_qp_attr qp_attr; 954 int qp_attr_mask, ret; 955 struct sk_buff *skb; 956 957 p->mtu = be32_to_cpu(data->mtu); 958 959 if (p->mtu <= IPOIB_ENCAP_LEN) { 960 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 961 p->mtu, IPOIB_ENCAP_LEN); 962 return -EINVAL; 963 } 964 965 qp_attr.qp_state = IB_QPS_RTR; 966 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 967 if (ret) { 968 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 969 return ret; 970 } 971 972 qp_attr.rq_psn = 0 /* FIXME */; 973 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 974 if (ret) { 975 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 976 return ret; 977 } 978 979 qp_attr.qp_state = IB_QPS_RTS; 980 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 981 if (ret) { 982 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 983 return ret; 984 } 985 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 986 if (ret) { 987 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 988 return ret; 989 } 990 991 skb_queue_head_init(&skqueue); 992 993 spin_lock_irq(&priv->lock); 994 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 995 if (p->neigh) 996 while ((skb = __skb_dequeue(&p->neigh->queue))) 997 __skb_queue_tail(&skqueue, skb); 998 spin_unlock_irq(&priv->lock); 999 1000 while ((skb = __skb_dequeue(&skqueue))) { 1001 skb->dev = p->dev; 1002 if (dev_queue_xmit(skb)) 1003 ipoib_warn(priv, "dev_queue_xmit failed " 1004 "to requeue packet\n"); 1005 } 1006 1007 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1008 if (ret) { 1009 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1010 return ret; 1011 } 1012 return 0; 1013} 1014 1015static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1016{ 1017 struct ipoib_dev_priv *priv = netdev_priv(dev); 1018 struct ib_qp_init_attr attr = { 1019 .send_cq = priv->recv_cq, 1020 .recv_cq = priv->recv_cq, 1021 .srq = priv->cm.srq, 1022 .cap.max_send_wr = ipoib_sendq_size, 1023 .cap.max_send_sge = 1, 1024 .sq_sig_type = IB_SIGNAL_ALL_WR, 1025 .qp_type = IB_QPT_RC, 1026 .qp_context = tx 1027 }; 1028 1029 return ib_create_qp(priv->pd, &attr); 1030} 1031 1032static int ipoib_cm_send_req(struct net_device *dev, 1033 struct ib_cm_id *id, struct ib_qp *qp, 1034 u32 qpn, 1035 struct ib_sa_path_rec *pathrec) 1036{ 1037 struct ipoib_dev_priv *priv = netdev_priv(dev); 1038 struct ipoib_cm_data data = {}; 1039 struct ib_cm_req_param req = {}; 1040 1041 data.qpn = cpu_to_be32(priv->qp->qp_num); 1042 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1043 1044 req.primary_path = pathrec; 1045 req.alternate_path = NULL; 1046 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1047 req.qp_num = qp->qp_num; 1048 req.qp_type = qp->qp_type; 1049 req.private_data = &data; 1050 req.private_data_len = sizeof data; 1051 req.flow_control = 0; 1052 1053 req.starting_psn = 0; /* FIXME */ 1054 1055 /* 1056 * Pick some arbitrary defaults here; we could make these 1057 * module parameters if anyone cared about setting them. 1058 */ 1059 req.responder_resources = 4; 1060 req.remote_cm_response_timeout = 20; 1061 req.local_cm_response_timeout = 20; 1062 req.retry_count = 0; /* RFC draft warns against retries */ 1063 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1064 req.max_cm_retries = 15; 1065 req.srq = ipoib_cm_has_srq(dev); 1066 return ib_send_cm_req(id, &req); 1067} 1068 1069static int ipoib_cm_modify_tx_init(struct net_device *dev, 1070 struct ib_cm_id *cm_id, struct ib_qp *qp) 1071{ 1072 struct ipoib_dev_priv *priv = netdev_priv(dev); 1073 struct ib_qp_attr qp_attr; 1074 int qp_attr_mask, ret; 1075 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1076 if (ret) { 1077 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1078 return ret; 1079 } 1080 1081 qp_attr.qp_state = IB_QPS_INIT; 1082 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1083 qp_attr.port_num = priv->port; 1084 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1085 1086 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1087 if (ret) { 1088 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1089 return ret; 1090 } 1091 return 0; 1092} 1093 1094static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1095 struct ib_sa_path_rec *pathrec) 1096{ 1097 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1098 int ret; 1099 1100 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring); 1101 if (!p->tx_ring) { 1102 ipoib_warn(priv, "failed to allocate tx ring\n"); 1103 ret = -ENOMEM; 1104 goto err_tx; 1105 } 1106 1107 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1108 if (IS_ERR(p->qp)) { 1109 ret = PTR_ERR(p->qp); 1110 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1111 goto err_qp; 1112 } 1113 1114 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1115 if (IS_ERR(p->id)) { 1116 ret = PTR_ERR(p->id); 1117 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1118 goto err_id; 1119 } 1120 1121 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1122 if (ret) { 1123 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1124 goto err_modify; 1125 } 1126 1127 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1128 if (ret) { 1129 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1130 goto err_send_cm; 1131 } 1132 1133 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1134 p->qp->qp_num, pathrec->dgid.raw, qpn); 1135 1136 return 0; 1137 1138err_send_cm: 1139err_modify: 1140 ib_destroy_cm_id(p->id); 1141err_id: 1142 p->id = NULL; 1143 ib_destroy_qp(p->qp); 1144err_qp: 1145 p->qp = NULL; 1146 vfree(p->tx_ring); 1147err_tx: 1148 return ret; 1149} 1150 1151static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1152{ 1153 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1154 struct ipoib_cm_tx_buf *tx_req; 1155 unsigned long begin; 1156 1157 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1158 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1159 1160 if (p->id) 1161 ib_destroy_cm_id(p->id); 1162 1163 if (p->tx_ring) { 1164 /* Wait for all sends to complete */ 1165 begin = jiffies; 1166 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1167 if (time_after(jiffies, begin + 5 * HZ)) { 1168 ipoib_warn(priv, "timing out; %d sends not completed\n", 1169 p->tx_head - p->tx_tail); 1170 goto timeout; 1171 } 1172 1173 msleep(1); 1174 } 1175 } 1176 1177timeout: 1178 1179 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1180 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1181 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1182 DMA_TO_DEVICE); 1183 dev_kfree_skb_any(tx_req->skb); 1184 ++p->tx_tail; 1185 netif_tx_lock_bh(p->dev); 1186 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1187 netif_queue_stopped(p->dev) && 1188 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1189 netif_wake_queue(p->dev); 1190 netif_tx_unlock_bh(p->dev); 1191 } 1192 1193 if (p->qp) 1194 ib_destroy_qp(p->qp); 1195 1196 vfree(p->tx_ring); 1197 kfree(p); 1198} 1199 1200static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1201 struct ib_cm_event *event) 1202{ 1203 struct ipoib_cm_tx *tx = cm_id->context; 1204 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1205 struct net_device *dev = priv->dev; 1206 struct ipoib_neigh *neigh; 1207 unsigned long flags; 1208 int ret; 1209 1210 switch (event->event) { 1211 case IB_CM_DREQ_RECEIVED: 1212 ipoib_dbg(priv, "DREQ received.\n"); 1213 ib_send_cm_drep(cm_id, NULL, 0); 1214 break; 1215 case IB_CM_REP_RECEIVED: 1216 ipoib_dbg(priv, "REP received.\n"); 1217 ret = ipoib_cm_rep_handler(cm_id, event); 1218 if (ret) 1219 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1220 NULL, 0, NULL, 0); 1221 break; 1222 case IB_CM_REQ_ERROR: 1223 case IB_CM_REJ_RECEIVED: 1224 case IB_CM_TIMEWAIT_EXIT: 1225 ipoib_dbg(priv, "CM error %d.\n", event->event); 1226 netif_tx_lock_bh(dev); 1227 spin_lock_irqsave(&priv->lock, flags); 1228 neigh = tx->neigh; 1229 1230 if (neigh) { 1231 neigh->cm = NULL; 1232 list_del(&neigh->list); 1233 if (neigh->ah) 1234 ipoib_put_ah(neigh->ah); 1235 ipoib_neigh_free(dev, neigh); 1236 1237 tx->neigh = NULL; 1238 } 1239 1240 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1241 list_move(&tx->list, &priv->cm.reap_list); 1242 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1243 } 1244 1245 spin_unlock_irqrestore(&priv->lock, flags); 1246 netif_tx_unlock_bh(dev); 1247 break; 1248 default: 1249 break; 1250 } 1251 1252 return 0; 1253} 1254 1255struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1256 struct ipoib_neigh *neigh) 1257{ 1258 struct ipoib_dev_priv *priv = netdev_priv(dev); 1259 struct ipoib_cm_tx *tx; 1260 1261 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1262 if (!tx) 1263 return NULL; 1264 1265 neigh->cm = tx; 1266 tx->neigh = neigh; 1267 tx->path = path; 1268 tx->dev = dev; 1269 list_add(&tx->list, &priv->cm.start_list); 1270 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1271 queue_work(ipoib_workqueue, &priv->cm.start_task); 1272 return tx; 1273} 1274 1275void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1276{ 1277 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1278 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1279 list_move(&tx->list, &priv->cm.reap_list); 1280 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1281 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1282 tx->neigh->dgid.raw); 1283 tx->neigh = NULL; 1284 } 1285} 1286 1287static void ipoib_cm_tx_start(struct work_struct *work) 1288{ 1289 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1290 cm.start_task); 1291 struct net_device *dev = priv->dev; 1292 struct ipoib_neigh *neigh; 1293 struct ipoib_cm_tx *p; 1294 unsigned long flags; 1295 int ret; 1296 1297 struct ib_sa_path_rec pathrec; 1298 u32 qpn; 1299 1300 netif_tx_lock_bh(dev); 1301 spin_lock_irqsave(&priv->lock, flags); 1302 1303 while (!list_empty(&priv->cm.start_list)) { 1304 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1305 list_del_init(&p->list); 1306 neigh = p->neigh; 1307 qpn = IPOIB_QPN(neigh->neighbour->ha); 1308 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1309 1310 spin_unlock_irqrestore(&priv->lock, flags); 1311 netif_tx_unlock_bh(dev); 1312 1313 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1314 1315 netif_tx_lock_bh(dev); 1316 spin_lock_irqsave(&priv->lock, flags); 1317 1318 if (ret) { 1319 neigh = p->neigh; 1320 if (neigh) { 1321 neigh->cm = NULL; 1322 list_del(&neigh->list); 1323 if (neigh->ah) 1324 ipoib_put_ah(neigh->ah); 1325 ipoib_neigh_free(dev, neigh); 1326 } 1327 list_del(&p->list); 1328 kfree(p); 1329 } 1330 } 1331 1332 spin_unlock_irqrestore(&priv->lock, flags); 1333 netif_tx_unlock_bh(dev); 1334} 1335 1336static void ipoib_cm_tx_reap(struct work_struct *work) 1337{ 1338 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1339 cm.reap_task); 1340 struct net_device *dev = priv->dev; 1341 struct ipoib_cm_tx *p; 1342 unsigned long flags; 1343 1344 netif_tx_lock_bh(dev); 1345 spin_lock_irqsave(&priv->lock, flags); 1346 1347 while (!list_empty(&priv->cm.reap_list)) { 1348 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1349 list_del(&p->list); 1350 spin_unlock_irqrestore(&priv->lock, flags); 1351 netif_tx_unlock_bh(dev); 1352 ipoib_cm_tx_destroy(p); 1353 netif_tx_lock_bh(dev); 1354 spin_lock_irqsave(&priv->lock, flags); 1355 } 1356 1357 spin_unlock_irqrestore(&priv->lock, flags); 1358 netif_tx_unlock_bh(dev); 1359} 1360 1361static void ipoib_cm_skb_reap(struct work_struct *work) 1362{ 1363 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1364 cm.skb_task); 1365 struct net_device *dev = priv->dev; 1366 struct sk_buff *skb; 1367 unsigned long flags; 1368 unsigned mtu = priv->mcast_mtu; 1369 1370 netif_tx_lock_bh(dev); 1371 spin_lock_irqsave(&priv->lock, flags); 1372 1373 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1374 spin_unlock_irqrestore(&priv->lock, flags); 1375 netif_tx_unlock_bh(dev); 1376 1377 if (skb->protocol == htons(ETH_P_IP)) 1378 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1379#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1380 else if (skb->protocol == htons(ETH_P_IPV6)) 1381 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1382#endif 1383 dev_kfree_skb_any(skb); 1384 1385 netif_tx_lock_bh(dev); 1386 spin_lock_irqsave(&priv->lock, flags); 1387 } 1388 1389 spin_unlock_irqrestore(&priv->lock, flags); 1390 netif_tx_unlock_bh(dev); 1391} 1392 1393void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1394 unsigned int mtu) 1395{ 1396 struct ipoib_dev_priv *priv = netdev_priv(dev); 1397 int e = skb_queue_empty(&priv->cm.skb_queue); 1398 1399 if (skb_dst(skb)) 1400 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); 1401 1402 skb_queue_tail(&priv->cm.skb_queue, skb); 1403 if (e) 1404 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1405} 1406 1407static void ipoib_cm_rx_reap(struct work_struct *work) 1408{ 1409 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1410 cm.rx_reap_task)->dev); 1411} 1412 1413static void ipoib_cm_stale_task(struct work_struct *work) 1414{ 1415 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1416 cm.stale_task.work); 1417 struct ipoib_cm_rx *p; 1418 int ret; 1419 1420 spin_lock_irq(&priv->lock); 1421 while (!list_empty(&priv->cm.passive_ids)) { 1422 /* List is sorted by LRU, start from tail, 1423 * stop when we see a recently used entry */ 1424 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1425 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1426 break; 1427 list_move(&p->list, &priv->cm.rx_error_list); 1428 p->state = IPOIB_CM_RX_ERROR; 1429 spin_unlock_irq(&priv->lock); 1430 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1431 if (ret) 1432 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1433 spin_lock_irq(&priv->lock); 1434 } 1435 1436 if (!list_empty(&priv->cm.passive_ids)) 1437 queue_delayed_work(ipoib_workqueue, 1438 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1439 spin_unlock_irq(&priv->lock); 1440} 1441 1442 1443static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1444 char *buf) 1445{ 1446 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1447 1448 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1449 return sprintf(buf, "connected\n"); 1450 else 1451 return sprintf(buf, "datagram\n"); 1452} 1453 1454static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1455 const char *buf, size_t count) 1456{ 1457 struct net_device *dev = to_net_dev(d); 1458 struct ipoib_dev_priv *priv = netdev_priv(dev); 1459 1460 if (!rtnl_trylock()) 1461 return restart_syscall(); 1462 1463 /* flush paths if we switch modes so that connections are restarted */ 1464 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 1465 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1466 ipoib_warn(priv, "enabling connected mode " 1467 "will cause multicast packet drops\n"); 1468 netdev_update_features(dev); 1469 rtnl_unlock(); 1470 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 1471 1472 ipoib_flush_paths(dev); 1473 return count; 1474 } 1475 1476 if (!strcmp(buf, "datagram\n")) { 1477 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 1478 netdev_update_features(dev); 1479 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 1480 rtnl_unlock(); 1481 ipoib_flush_paths(dev); 1482 1483 return count; 1484 } 1485 rtnl_unlock(); 1486 1487 return -EINVAL; 1488} 1489 1490static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1491 1492int ipoib_cm_add_mode_attr(struct net_device *dev) 1493{ 1494 return device_create_file(&dev->dev, &dev_attr_mode); 1495} 1496 1497static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1498{ 1499 struct ipoib_dev_priv *priv = netdev_priv(dev); 1500 struct ib_srq_init_attr srq_init_attr = { 1501 .srq_type = IB_SRQT_BASIC, 1502 .attr = { 1503 .max_wr = ipoib_recvq_size, 1504 .max_sge = max_sge 1505 } 1506 }; 1507 1508 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1509 if (IS_ERR(priv->cm.srq)) { 1510 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1511 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1512 priv->ca->name, PTR_ERR(priv->cm.srq)); 1513 priv->cm.srq = NULL; 1514 return; 1515 } 1516 1517 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1518 if (!priv->cm.srq_ring) { 1519 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1520 priv->ca->name, ipoib_recvq_size); 1521 ib_destroy_srq(priv->cm.srq); 1522 priv->cm.srq = NULL; 1523 return; 1524 } 1525 1526} 1527 1528int ipoib_cm_dev_init(struct net_device *dev) 1529{ 1530 struct ipoib_dev_priv *priv = netdev_priv(dev); 1531 int i, ret; 1532 struct ib_device_attr attr; 1533 1534 INIT_LIST_HEAD(&priv->cm.passive_ids); 1535 INIT_LIST_HEAD(&priv->cm.reap_list); 1536 INIT_LIST_HEAD(&priv->cm.start_list); 1537 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1538 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1539 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1540 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1541 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1542 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1543 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1544 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1545 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1546 1547 skb_queue_head_init(&priv->cm.skb_queue); 1548 1549 ret = ib_query_device(priv->ca, &attr); 1550 if (ret) { 1551 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1552 return ret; 1553 } 1554 1555 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1556 1557 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1558 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1559 if (ipoib_cm_has_srq(dev)) { 1560 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1561 priv->cm.num_frags = attr.max_srq_sge; 1562 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1563 priv->cm.max_cm_mtu, priv->cm.num_frags); 1564 } else { 1565 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1566 priv->cm.num_frags = IPOIB_CM_RX_SG; 1567 } 1568 1569 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1570 1571 if (ipoib_cm_has_srq(dev)) { 1572 for (i = 0; i < ipoib_recvq_size; ++i) { 1573 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1574 priv->cm.num_frags - 1, 1575 priv->cm.srq_ring[i].mapping)) { 1576 ipoib_warn(priv, "failed to allocate " 1577 "receive buffer %d\n", i); 1578 ipoib_cm_dev_cleanup(dev); 1579 return -ENOMEM; 1580 } 1581 1582 if (ipoib_cm_post_receive_srq(dev, i)) { 1583 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1584 "failed for buf %d\n", i); 1585 ipoib_cm_dev_cleanup(dev); 1586 return -EIO; 1587 } 1588 } 1589 } 1590 1591 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1592 return 0; 1593} 1594 1595void ipoib_cm_dev_cleanup(struct net_device *dev) 1596{ 1597 struct ipoib_dev_priv *priv = netdev_priv(dev); 1598 int ret; 1599 1600 if (!priv->cm.srq) 1601 return; 1602 1603 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1604 1605 ret = ib_destroy_srq(priv->cm.srq); 1606 if (ret) 1607 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1608 1609 priv->cm.srq = NULL; 1610 if (!priv->cm.srq_ring) 1611 return; 1612 1613 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1614 priv->cm.srq_ring = NULL; 1615} 1616