1 /* 2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/delay.h> 37 #include <linux/dma-mapping.h> 38 39 #include <rdma/ib_cache.h> 40 #include <linux/ip.h> 41 #include <linux/tcp.h> 42 43 #include "ipoib.h" 44 45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 46 static int data_debug_level; 47 48 module_param(data_debug_level, int, 0644); 49 MODULE_PARM_DESC(data_debug_level, 50 "Enable data path debug tracing if > 0"); 51 #endif 52 53 static DEFINE_MUTEX(pkey_mutex); 54 55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 56 struct ib_pd *pd, struct ib_ah_attr *attr) 57 { 58 struct ipoib_ah *ah; 59 60 ah = kmalloc(sizeof *ah, GFP_KERNEL); 61 if (!ah) 62 return NULL; 63 64 ah->dev = dev; 65 ah->last_send = 0; 66 kref_init(&ah->ref); 67 68 ah->ah = ib_create_ah(pd, attr); 69 if (IS_ERR(ah->ah)) { 70 kfree(ah); 71 ah = NULL; 72 } else 73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 74 75 return ah; 76 } 77 78 void ipoib_free_ah(struct kref *kref) 79 { 80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 82 83 unsigned long flags; 84 85 spin_lock_irqsave(&priv->lock, flags); 86 list_add_tail(&ah->list, &priv->dead_ahs); 87 spin_unlock_irqrestore(&priv->lock, flags); 88 } 89 90 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 91 u64 mapping[IPOIB_UD_RX_SG]) 92 { 93 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 94 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE, 95 DMA_FROM_DEVICE); 96 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE, 97 DMA_FROM_DEVICE); 98 } else 99 ib_dma_unmap_single(priv->ca, mapping[0], 100 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 101 DMA_FROM_DEVICE); 102 } 103 104 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv, 105 struct sk_buff *skb, 106 unsigned int length) 107 { 108 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 109 skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; 110 unsigned int size; 111 /* 112 * There is only two buffers needed for max_payload = 4K, 113 * first buf size is IPOIB_UD_HEAD_SIZE 114 */ 115 skb->tail += IPOIB_UD_HEAD_SIZE; 116 skb->len += length; 117 118 size = length - IPOIB_UD_HEAD_SIZE; 119 120 frag->size = size; 121 skb->data_len += size; 122 skb->truesize += size; 123 } else 124 skb_put(skb, length); 125 126 } 127 128 static int ipoib_ib_post_receive(struct net_device *dev, int id) 129 { 130 struct ipoib_dev_priv *priv = netdev_priv(dev); 131 struct ib_recv_wr *bad_wr; 132 int ret; 133 134 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 135 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 136 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 137 138 139 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr); 140 if (unlikely(ret)) { 141 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 142 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 143 dev_kfree_skb_any(priv->rx_ring[id].skb); 144 priv->rx_ring[id].skb = NULL; 145 } 146 147 return ret; 148 } 149 150 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 151 { 152 struct ipoib_dev_priv *priv = netdev_priv(dev); 153 struct sk_buff *skb; 154 int buf_size; 155 u64 *mapping; 156 157 if (ipoib_ud_need_sg(priv->max_ib_mtu)) 158 buf_size = IPOIB_UD_HEAD_SIZE; 159 else 160 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 161 162 skb = dev_alloc_skb(buf_size + 4); 163 if (unlikely(!skb)) 164 return NULL; 165 166 /* 167 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 168 * header. So we need 4 more bytes to get to 48 and align the 169 * IP header to a multiple of 16. 170 */ 171 skb_reserve(skb, 4); 172 173 mapping = priv->rx_ring[id].mapping; 174 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 175 DMA_FROM_DEVICE); 176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 177 goto error; 178 179 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 180 struct page *page = alloc_page(GFP_ATOMIC); 181 if (!page) 182 goto partial_error; 183 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE); 184 mapping[1] = 185 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page, 186 0, PAGE_SIZE, DMA_FROM_DEVICE); 187 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1]))) 188 goto partial_error; 189 } 190 191 priv->rx_ring[id].skb = skb; 192 return skb; 193 194 partial_error: 195 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE); 196 error: 197 dev_kfree_skb_any(skb); 198 return NULL; 199 } 200 201 static int ipoib_ib_post_receives(struct net_device *dev) 202 { 203 struct ipoib_dev_priv *priv = netdev_priv(dev); 204 int i; 205 206 for (i = 0; i < ipoib_recvq_size; ++i) { 207 if (!ipoib_alloc_rx_skb(dev, i)) { 208 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 209 return -ENOMEM; 210 } 211 if (ipoib_ib_post_receive(dev, i)) { 212 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 213 return -EIO; 214 } 215 } 216 217 return 0; 218 } 219 220 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 221 { 222 struct ipoib_dev_priv *priv = netdev_priv(dev); 223 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 224 struct sk_buff *skb; 225 u64 mapping[IPOIB_UD_RX_SG]; 226 227 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 228 wr_id, wc->status); 229 230 if (unlikely(wr_id >= ipoib_recvq_size)) { 231 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 232 wr_id, ipoib_recvq_size); 233 return; 234 } 235 236 skb = priv->rx_ring[wr_id].skb; 237 238 if (unlikely(wc->status != IB_WC_SUCCESS)) { 239 if (wc->status != IB_WC_WR_FLUSH_ERR) 240 ipoib_warn(priv, "failed recv event " 241 "(status=%d, wrid=%d vend_err %x)\n", 242 wc->status, wr_id, wc->vendor_err); 243 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 244 dev_kfree_skb_any(skb); 245 priv->rx_ring[wr_id].skb = NULL; 246 return; 247 } 248 249 /* 250 * Drop packets that this interface sent, ie multicast packets 251 * that the HCA has replicated. 252 */ 253 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 254 goto repost; 255 256 memcpy(mapping, priv->rx_ring[wr_id].mapping, 257 IPOIB_UD_RX_SG * sizeof *mapping); 258 259 /* 260 * If we can't allocate a new RX buffer, dump 261 * this packet and reuse the old buffer. 262 */ 263 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 264 ++dev->stats.rx_dropped; 265 goto repost; 266 } 267 268 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 269 wc->byte_len, wc->slid); 270 271 ipoib_ud_dma_unmap_rx(priv, mapping); 272 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len); 273 274 skb_pull(skb, IB_GRH_BYTES); 275 276 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 277 skb_reset_mac_header(skb); 278 skb_pull(skb, IPOIB_ENCAP_LEN); 279 280 dev->last_rx = jiffies; 281 ++dev->stats.rx_packets; 282 dev->stats.rx_bytes += skb->len; 283 284 skb->dev = dev; 285 /* XXX get correct PACKET_ type here */ 286 skb->pkt_type = PACKET_HOST; 287 288 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok)) 289 skb->ip_summed = CHECKSUM_UNNECESSARY; 290 291 if (dev->features & NETIF_F_LRO) 292 lro_receive_skb(&priv->lro.lro_mgr, skb, NULL); 293 else 294 netif_receive_skb(skb); 295 296 repost: 297 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 298 ipoib_warn(priv, "ipoib_ib_post_receive failed " 299 "for buf %d\n", wr_id); 300 } 301 302 static int ipoib_dma_map_tx(struct ib_device *ca, 303 struct ipoib_tx_buf *tx_req) 304 { 305 struct sk_buff *skb = tx_req->skb; 306 u64 *mapping = tx_req->mapping; 307 int i; 308 int off; 309 310 if (skb_headlen(skb)) { 311 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 312 DMA_TO_DEVICE); 313 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 314 return -EIO; 315 316 off = 1; 317 } else 318 off = 0; 319 320 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 321 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 322 mapping[i + off] = ib_dma_map_page(ca, frag->page, 323 frag->page_offset, frag->size, 324 DMA_TO_DEVICE); 325 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 326 goto partial_error; 327 } 328 return 0; 329 330 partial_error: 331 for (; i > 0; --i) { 332 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 333 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE); 334 } 335 336 if (off) 337 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 338 339 return -EIO; 340 } 341 342 static void ipoib_dma_unmap_tx(struct ib_device *ca, 343 struct ipoib_tx_buf *tx_req) 344 { 345 struct sk_buff *skb = tx_req->skb; 346 u64 *mapping = tx_req->mapping; 347 int i; 348 int off; 349 350 if (skb_headlen(skb)) { 351 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 352 off = 1; 353 } else 354 off = 0; 355 356 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 357 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 358 ib_dma_unmap_page(ca, mapping[i + off], frag->size, 359 DMA_TO_DEVICE); 360 } 361 } 362 363 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 364 { 365 struct ipoib_dev_priv *priv = netdev_priv(dev); 366 unsigned int wr_id = wc->wr_id; 367 struct ipoib_tx_buf *tx_req; 368 369 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 370 wr_id, wc->status); 371 372 if (unlikely(wr_id >= ipoib_sendq_size)) { 373 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 374 wr_id, ipoib_sendq_size); 375 return; 376 } 377 378 tx_req = &priv->tx_ring[wr_id]; 379 380 ipoib_dma_unmap_tx(priv->ca, tx_req); 381 382 ++dev->stats.tx_packets; 383 dev->stats.tx_bytes += tx_req->skb->len; 384 385 dev_kfree_skb_any(tx_req->skb); 386 387 ++priv->tx_tail; 388 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 389 netif_queue_stopped(dev) && 390 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 391 netif_wake_queue(dev); 392 393 if (wc->status != IB_WC_SUCCESS && 394 wc->status != IB_WC_WR_FLUSH_ERR) 395 ipoib_warn(priv, "failed send event " 396 "(status=%d, wrid=%d vend_err %x)\n", 397 wc->status, wr_id, wc->vendor_err); 398 } 399 400 static int poll_tx(struct ipoib_dev_priv *priv) 401 { 402 int n, i; 403 404 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 405 for (i = 0; i < n; ++i) 406 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 407 408 return n == MAX_SEND_CQE; 409 } 410 411 int ipoib_poll(struct napi_struct *napi, int budget) 412 { 413 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 414 struct net_device *dev = priv->dev; 415 int done; 416 int t; 417 int n, i; 418 419 done = 0; 420 421 poll_more: 422 while (done < budget) { 423 int max = (budget - done); 424 425 t = min(IPOIB_NUM_WC, max); 426 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 427 428 for (i = 0; i < n; i++) { 429 struct ib_wc *wc = priv->ibwc + i; 430 431 if (wc->wr_id & IPOIB_OP_RECV) { 432 ++done; 433 if (wc->wr_id & IPOIB_OP_CM) 434 ipoib_cm_handle_rx_wc(dev, wc); 435 else 436 ipoib_ib_handle_rx_wc(dev, wc); 437 } else 438 ipoib_cm_handle_tx_wc(priv->dev, wc); 439 } 440 441 if (n != t) 442 break; 443 } 444 445 if (done < budget) { 446 if (dev->features & NETIF_F_LRO) 447 lro_flush_all(&priv->lro.lro_mgr); 448 449 netif_rx_complete(dev, napi); 450 if (unlikely(ib_req_notify_cq(priv->recv_cq, 451 IB_CQ_NEXT_COMP | 452 IB_CQ_REPORT_MISSED_EVENTS)) && 453 netif_rx_reschedule(dev, napi)) 454 goto poll_more; 455 } 456 457 return done; 458 } 459 460 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 461 { 462 struct net_device *dev = dev_ptr; 463 struct ipoib_dev_priv *priv = netdev_priv(dev); 464 465 netif_rx_schedule(dev, &priv->napi); 466 } 467 468 static void drain_tx_cq(struct net_device *dev) 469 { 470 struct ipoib_dev_priv *priv = netdev_priv(dev); 471 472 netif_tx_lock(dev); 473 while (poll_tx(priv)) 474 ; /* nothing */ 475 476 if (netif_queue_stopped(dev)) 477 mod_timer(&priv->poll_timer, jiffies + 1); 478 479 netif_tx_unlock(dev); 480 } 481 482 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 483 { 484 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 485 486 mod_timer(&priv->poll_timer, jiffies); 487 } 488 489 static inline int post_send(struct ipoib_dev_priv *priv, 490 unsigned int wr_id, 491 struct ib_ah *address, u32 qpn, 492 struct ipoib_tx_buf *tx_req, 493 void *head, int hlen) 494 { 495 struct ib_send_wr *bad_wr; 496 int i, off; 497 struct sk_buff *skb = tx_req->skb; 498 skb_frag_t *frags = skb_shinfo(skb)->frags; 499 int nr_frags = skb_shinfo(skb)->nr_frags; 500 u64 *mapping = tx_req->mapping; 501 502 if (skb_headlen(skb)) { 503 priv->tx_sge[0].addr = mapping[0]; 504 priv->tx_sge[0].length = skb_headlen(skb); 505 off = 1; 506 } else 507 off = 0; 508 509 for (i = 0; i < nr_frags; ++i) { 510 priv->tx_sge[i + off].addr = mapping[i + off]; 511 priv->tx_sge[i + off].length = frags[i].size; 512 } 513 priv->tx_wr.num_sge = nr_frags + off; 514 priv->tx_wr.wr_id = wr_id; 515 priv->tx_wr.wr.ud.remote_qpn = qpn; 516 priv->tx_wr.wr.ud.ah = address; 517 518 if (head) { 519 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 520 priv->tx_wr.wr.ud.header = head; 521 priv->tx_wr.wr.ud.hlen = hlen; 522 priv->tx_wr.opcode = IB_WR_LSO; 523 } else 524 priv->tx_wr.opcode = IB_WR_SEND; 525 526 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 527 } 528 529 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 530 struct ipoib_ah *address, u32 qpn) 531 { 532 struct ipoib_dev_priv *priv = netdev_priv(dev); 533 struct ipoib_tx_buf *tx_req; 534 int hlen; 535 void *phead; 536 537 if (skb_is_gso(skb)) { 538 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 539 phead = skb->data; 540 if (unlikely(!skb_pull(skb, hlen))) { 541 ipoib_warn(priv, "linear data too small\n"); 542 ++dev->stats.tx_dropped; 543 ++dev->stats.tx_errors; 544 dev_kfree_skb_any(skb); 545 return; 546 } 547 } else { 548 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 549 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 550 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 551 ++dev->stats.tx_dropped; 552 ++dev->stats.tx_errors; 553 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 554 return; 555 } 556 phead = NULL; 557 hlen = 0; 558 } 559 560 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 561 skb->len, address, qpn); 562 563 /* 564 * We put the skb into the tx_ring _before_ we call post_send() 565 * because it's entirely possible that the completion handler will 566 * run before we execute anything after the post_send(). That 567 * means we have to make sure everything is properly recorded and 568 * our state is consistent before we call post_send(). 569 */ 570 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 571 tx_req->skb = skb; 572 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 573 ++dev->stats.tx_errors; 574 dev_kfree_skb_any(skb); 575 return; 576 } 577 578 if (skb->ip_summed == CHECKSUM_PARTIAL) 579 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 580 else 581 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 582 583 if (++priv->tx_outstanding == ipoib_sendq_size) { 584 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 585 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 586 ipoib_warn(priv, "request notify on send CQ failed\n"); 587 netif_stop_queue(dev); 588 } 589 590 if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 591 address->ah, qpn, tx_req, phead, hlen))) { 592 ipoib_warn(priv, "post_send failed\n"); 593 ++dev->stats.tx_errors; 594 --priv->tx_outstanding; 595 ipoib_dma_unmap_tx(priv->ca, tx_req); 596 dev_kfree_skb_any(skb); 597 if (netif_queue_stopped(dev)) 598 netif_wake_queue(dev); 599 } else { 600 dev->trans_start = jiffies; 601 602 address->last_send = priv->tx_head; 603 ++priv->tx_head; 604 skb_orphan(skb); 605 606 } 607 608 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 609 while (poll_tx(priv)) 610 ; /* nothing */ 611 } 612 613 static void __ipoib_reap_ah(struct net_device *dev) 614 { 615 struct ipoib_dev_priv *priv = netdev_priv(dev); 616 struct ipoib_ah *ah, *tah; 617 LIST_HEAD(remove_list); 618 unsigned long flags; 619 620 netif_tx_lock_bh(dev); 621 spin_lock_irqsave(&priv->lock, flags); 622 623 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 624 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 625 list_del(&ah->list); 626 ib_destroy_ah(ah->ah); 627 kfree(ah); 628 } 629 630 spin_unlock_irqrestore(&priv->lock, flags); 631 netif_tx_unlock_bh(dev); 632 } 633 634 void ipoib_reap_ah(struct work_struct *work) 635 { 636 struct ipoib_dev_priv *priv = 637 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 638 struct net_device *dev = priv->dev; 639 640 __ipoib_reap_ah(dev); 641 642 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 643 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 644 round_jiffies_relative(HZ)); 645 } 646 647 static void ipoib_ib_tx_timer_func(unsigned long ctx) 648 { 649 drain_tx_cq((struct net_device *)ctx); 650 } 651 652 int ipoib_ib_dev_open(struct net_device *dev) 653 { 654 struct ipoib_dev_priv *priv = netdev_priv(dev); 655 int ret; 656 657 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { 658 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); 659 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 660 return -1; 661 } 662 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 663 664 ret = ipoib_init_qp(dev); 665 if (ret) { 666 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 667 return -1; 668 } 669 670 ret = ipoib_ib_post_receives(dev); 671 if (ret) { 672 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 673 ipoib_ib_dev_stop(dev, 1); 674 return -1; 675 } 676 677 ret = ipoib_cm_dev_open(dev); 678 if (ret) { 679 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 680 ipoib_ib_dev_stop(dev, 1); 681 return -1; 682 } 683 684 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 685 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 686 round_jiffies_relative(HZ)); 687 688 set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 689 690 return 0; 691 } 692 693 static void ipoib_pkey_dev_check_presence(struct net_device *dev) 694 { 695 struct ipoib_dev_priv *priv = netdev_priv(dev); 696 u16 pkey_index = 0; 697 698 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 699 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 700 else 701 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 702 } 703 704 int ipoib_ib_dev_up(struct net_device *dev) 705 { 706 struct ipoib_dev_priv *priv = netdev_priv(dev); 707 708 ipoib_pkey_dev_check_presence(dev); 709 710 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 711 ipoib_dbg(priv, "PKEY is not assigned.\n"); 712 return 0; 713 } 714 715 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 716 717 return ipoib_mcast_start_thread(dev); 718 } 719 720 int ipoib_ib_dev_down(struct net_device *dev, int flush) 721 { 722 struct ipoib_dev_priv *priv = netdev_priv(dev); 723 724 ipoib_dbg(priv, "downing ib_dev\n"); 725 726 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 727 netif_carrier_off(dev); 728 729 /* Shutdown the P_Key thread if still active */ 730 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 731 mutex_lock(&pkey_mutex); 732 set_bit(IPOIB_PKEY_STOP, &priv->flags); 733 cancel_delayed_work(&priv->pkey_poll_task); 734 mutex_unlock(&pkey_mutex); 735 if (flush) 736 flush_workqueue(ipoib_workqueue); 737 } 738 739 ipoib_mcast_stop_thread(dev, flush); 740 ipoib_mcast_dev_flush(dev); 741 742 ipoib_flush_paths(dev); 743 744 return 0; 745 } 746 747 static int recvs_pending(struct net_device *dev) 748 { 749 struct ipoib_dev_priv *priv = netdev_priv(dev); 750 int pending = 0; 751 int i; 752 753 for (i = 0; i < ipoib_recvq_size; ++i) 754 if (priv->rx_ring[i].skb) 755 ++pending; 756 757 return pending; 758 } 759 760 void ipoib_drain_cq(struct net_device *dev) 761 { 762 struct ipoib_dev_priv *priv = netdev_priv(dev); 763 int i, n; 764 765 /* 766 * We call completion handling routines that expect to be 767 * called from the BH-disabled NAPI poll context, so disable 768 * BHs here too. 769 */ 770 local_bh_disable(); 771 772 do { 773 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 774 for (i = 0; i < n; ++i) { 775 /* 776 * Convert any successful completions to flush 777 * errors to avoid passing packets up the 778 * stack after bringing the device down. 779 */ 780 if (priv->ibwc[i].status == IB_WC_SUCCESS) 781 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 782 783 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 784 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 785 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 786 else 787 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 788 } else 789 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 790 } 791 } while (n == IPOIB_NUM_WC); 792 793 while (poll_tx(priv)) 794 ; /* nothing */ 795 796 local_bh_enable(); 797 } 798 799 int ipoib_ib_dev_stop(struct net_device *dev, int flush) 800 { 801 struct ipoib_dev_priv *priv = netdev_priv(dev); 802 struct ib_qp_attr qp_attr; 803 unsigned long begin; 804 struct ipoib_tx_buf *tx_req; 805 int i; 806 807 clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); 808 809 ipoib_cm_dev_stop(dev); 810 811 /* 812 * Move our QP to the error state and then reinitialize in 813 * when all work requests have completed or have been flushed. 814 */ 815 qp_attr.qp_state = IB_QPS_ERR; 816 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 817 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 818 819 /* Wait for all sends and receives to complete */ 820 begin = jiffies; 821 822 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 823 if (time_after(jiffies, begin + 5 * HZ)) { 824 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 825 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 826 827 /* 828 * assume the HW is wedged and just free up 829 * all our pending work requests. 830 */ 831 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 832 tx_req = &priv->tx_ring[priv->tx_tail & 833 (ipoib_sendq_size - 1)]; 834 ipoib_dma_unmap_tx(priv->ca, tx_req); 835 dev_kfree_skb_any(tx_req->skb); 836 ++priv->tx_tail; 837 --priv->tx_outstanding; 838 } 839 840 for (i = 0; i < ipoib_recvq_size; ++i) { 841 struct ipoib_rx_buf *rx_req; 842 843 rx_req = &priv->rx_ring[i]; 844 if (!rx_req->skb) 845 continue; 846 ipoib_ud_dma_unmap_rx(priv, 847 priv->rx_ring[i].mapping); 848 dev_kfree_skb_any(rx_req->skb); 849 rx_req->skb = NULL; 850 } 851 852 goto timeout; 853 } 854 855 ipoib_drain_cq(dev); 856 857 msleep(1); 858 } 859 860 ipoib_dbg(priv, "All sends and receives done.\n"); 861 862 timeout: 863 del_timer_sync(&priv->poll_timer); 864 qp_attr.qp_state = IB_QPS_RESET; 865 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 866 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 867 868 /* Wait for all AHs to be reaped */ 869 set_bit(IPOIB_STOP_REAPER, &priv->flags); 870 cancel_delayed_work(&priv->ah_reap_task); 871 if (flush) 872 flush_workqueue(ipoib_workqueue); 873 874 begin = jiffies; 875 876 while (!list_empty(&priv->dead_ahs)) { 877 __ipoib_reap_ah(dev); 878 879 if (time_after(jiffies, begin + HZ)) { 880 ipoib_warn(priv, "timing out; will leak address handles\n"); 881 break; 882 } 883 884 msleep(1); 885 } 886 887 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 888 889 return 0; 890 } 891 892 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 893 { 894 struct ipoib_dev_priv *priv = netdev_priv(dev); 895 896 priv->ca = ca; 897 priv->port = port; 898 priv->qp = NULL; 899 900 if (ipoib_transport_dev_init(dev, ca)) { 901 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 902 return -ENODEV; 903 } 904 905 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 906 (unsigned long) dev); 907 908 if (dev->flags & IFF_UP) { 909 if (ipoib_ib_dev_open(dev)) { 910 ipoib_transport_dev_cleanup(dev); 911 return -ENODEV; 912 } 913 } 914 915 return 0; 916 } 917 918 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 919 enum ipoib_flush_level level) 920 { 921 struct ipoib_dev_priv *cpriv; 922 struct net_device *dev = priv->dev; 923 u16 new_index; 924 925 mutex_lock(&priv->vlan_mutex); 926 927 /* 928 * Flush any child interfaces too -- they might be up even if 929 * the parent is down. 930 */ 931 list_for_each_entry(cpriv, &priv->child_intfs, list) 932 __ipoib_ib_dev_flush(cpriv, level); 933 934 mutex_unlock(&priv->vlan_mutex); 935 936 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { 937 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 938 return; 939 } 940 941 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 942 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 943 return; 944 } 945 946 if (level == IPOIB_FLUSH_HEAVY) { 947 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { 948 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 949 ipoib_ib_dev_down(dev, 0); 950 ipoib_ib_dev_stop(dev, 0); 951 if (ipoib_pkey_dev_delay_open(dev)) 952 return; 953 } 954 955 /* restart QP only if P_Key index is changed */ 956 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 957 new_index == priv->pkey_index) { 958 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 959 return; 960 } 961 priv->pkey_index = new_index; 962 } 963 964 if (level == IPOIB_FLUSH_LIGHT) { 965 ipoib_mark_paths_invalid(dev); 966 ipoib_mcast_dev_flush(dev); 967 } 968 969 if (level >= IPOIB_FLUSH_NORMAL) 970 ipoib_ib_dev_down(dev, 0); 971 972 if (level == IPOIB_FLUSH_HEAVY) { 973 ipoib_ib_dev_stop(dev, 0); 974 ipoib_ib_dev_open(dev); 975 } 976 977 /* 978 * The device could have been brought down between the start and when 979 * we get here, don't bring it back up if it's not configured up 980 */ 981 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 982 if (level >= IPOIB_FLUSH_NORMAL) 983 ipoib_ib_dev_up(dev); 984 ipoib_mcast_restart_task(&priv->restart_task); 985 } 986 } 987 988 void ipoib_ib_dev_flush_light(struct work_struct *work) 989 { 990 struct ipoib_dev_priv *priv = 991 container_of(work, struct ipoib_dev_priv, flush_light); 992 993 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 994 } 995 996 void ipoib_ib_dev_flush_normal(struct work_struct *work) 997 { 998 struct ipoib_dev_priv *priv = 999 container_of(work, struct ipoib_dev_priv, flush_normal); 1000 1001 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1002 } 1003 1004 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1005 { 1006 struct ipoib_dev_priv *priv = 1007 container_of(work, struct ipoib_dev_priv, flush_heavy); 1008 1009 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1010 } 1011 1012 void ipoib_ib_dev_cleanup(struct net_device *dev) 1013 { 1014 struct ipoib_dev_priv *priv = netdev_priv(dev); 1015 1016 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1017 1018 ipoib_mcast_stop_thread(dev, 1); 1019 ipoib_mcast_dev_flush(dev); 1020 1021 ipoib_transport_dev_cleanup(dev); 1022 } 1023 1024 /* 1025 * Delayed P_Key Assigment Interim Support 1026 * 1027 * The following is initial implementation of delayed P_Key assigment 1028 * mechanism. It is using the same approach implemented for the multicast 1029 * group join. The single goal of this implementation is to quickly address 1030 * Bug #2507. This implementation will probably be removed when the P_Key 1031 * change async notification is available. 1032 */ 1033 1034 void ipoib_pkey_poll(struct work_struct *work) 1035 { 1036 struct ipoib_dev_priv *priv = 1037 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work); 1038 struct net_device *dev = priv->dev; 1039 1040 ipoib_pkey_dev_check_presence(dev); 1041 1042 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 1043 ipoib_open(dev); 1044 else { 1045 mutex_lock(&pkey_mutex); 1046 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 1047 queue_delayed_work(ipoib_workqueue, 1048 &priv->pkey_poll_task, 1049 HZ); 1050 mutex_unlock(&pkey_mutex); 1051 } 1052 } 1053 1054 int ipoib_pkey_dev_delay_open(struct net_device *dev) 1055 { 1056 struct ipoib_dev_priv *priv = netdev_priv(dev); 1057 1058 /* Look for the interface pkey value in the IB Port P_Key table and */ 1059 /* set the interface pkey assigment flag */ 1060 ipoib_pkey_dev_check_presence(dev); 1061 1062 /* P_Key value not assigned yet - start polling */ 1063 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 1064 mutex_lock(&pkey_mutex); 1065 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 1066 queue_delayed_work(ipoib_workqueue, 1067 &priv->pkey_poll_task, 1068 HZ); 1069 mutex_unlock(&pkey_mutex); 1070 return 1; 1071 } 1072 1073 return 0; 1074 } 1075