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/moduleparam.h> 38 #include <linux/dma-mapping.h> 39 #include <linux/slab.h> 40 41 #include <linux/ip.h> 42 #include <linux/tcp.h> 43 44 #include "ipoib.h" 45 46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 47 static int data_debug_level; 48 49 module_param(data_debug_level, int, 0644); 50 MODULE_PARM_DESC(data_debug_level, 51 "Enable data path debug tracing if > 0"); 52 #endif 53 54 static DEFINE_MUTEX(pkey_mutex); 55 56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev, 57 struct ib_pd *pd, struct ib_ah_attr *attr) 58 { 59 struct ipoib_ah *ah; 60 struct ib_ah *vah; 61 62 ah = kmalloc(sizeof *ah, GFP_KERNEL); 63 if (!ah) 64 return ERR_PTR(-ENOMEM); 65 66 ah->dev = dev; 67 ah->last_send = 0; 68 kref_init(&ah->ref); 69 70 vah = ib_create_ah(pd, attr); 71 if (IS_ERR(vah)) { 72 kfree(ah); 73 ah = (struct ipoib_ah *)vah; 74 } else { 75 ah->ah = vah; 76 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah); 77 } 78 79 return ah; 80 } 81 82 void ipoib_free_ah(struct kref *kref) 83 { 84 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref); 85 struct ipoib_dev_priv *priv = netdev_priv(ah->dev); 86 87 unsigned long flags; 88 89 spin_lock_irqsave(&priv->lock, flags); 90 list_add_tail(&ah->list, &priv->dead_ahs); 91 spin_unlock_irqrestore(&priv->lock, flags); 92 } 93 94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv, 95 u64 mapping[IPOIB_UD_RX_SG]) 96 { 97 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 98 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE, 99 DMA_FROM_DEVICE); 100 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE, 101 DMA_FROM_DEVICE); 102 } else 103 ib_dma_unmap_single(priv->ca, mapping[0], 104 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu), 105 DMA_FROM_DEVICE); 106 } 107 108 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv, 109 struct sk_buff *skb, 110 unsigned int length) 111 { 112 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 113 skb_frag_t *frag = &skb_shinfo(skb)->frags[0]; 114 unsigned int size; 115 /* 116 * There is only two buffers needed for max_payload = 4K, 117 * first buf size is IPOIB_UD_HEAD_SIZE 118 */ 119 skb->tail += IPOIB_UD_HEAD_SIZE; 120 skb->len += length; 121 122 size = length - IPOIB_UD_HEAD_SIZE; 123 124 skb_frag_size_set(frag, size); 125 skb->data_len += size; 126 skb->truesize += size; 127 } else 128 skb_put(skb, length); 129 130 } 131 132 static int ipoib_ib_post_receive(struct net_device *dev, int id) 133 { 134 struct ipoib_dev_priv *priv = netdev_priv(dev); 135 struct ib_recv_wr *bad_wr; 136 int ret; 137 138 priv->rx_wr.wr_id = id | IPOIB_OP_RECV; 139 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0]; 140 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1]; 141 142 143 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr); 144 if (unlikely(ret)) { 145 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret); 146 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping); 147 dev_kfree_skb_any(priv->rx_ring[id].skb); 148 priv->rx_ring[id].skb = NULL; 149 } 150 151 return ret; 152 } 153 154 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id) 155 { 156 struct ipoib_dev_priv *priv = netdev_priv(dev); 157 struct sk_buff *skb; 158 int buf_size; 159 u64 *mapping; 160 161 if (ipoib_ud_need_sg(priv->max_ib_mtu)) 162 buf_size = IPOIB_UD_HEAD_SIZE; 163 else 164 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 165 166 skb = dev_alloc_skb(buf_size + 4); 167 if (unlikely(!skb)) 168 return NULL; 169 170 /* 171 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 172 * header. So we need 4 more bytes to get to 48 and align the 173 * IP header to a multiple of 16. 174 */ 175 skb_reserve(skb, 4); 176 177 mapping = priv->rx_ring[id].mapping; 178 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 179 DMA_FROM_DEVICE); 180 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 181 goto error; 182 183 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 184 struct page *page = alloc_page(GFP_ATOMIC); 185 if (!page) 186 goto partial_error; 187 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE); 188 mapping[1] = 189 ib_dma_map_page(priv->ca, page, 190 0, PAGE_SIZE, DMA_FROM_DEVICE); 191 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1]))) 192 goto partial_error; 193 } 194 195 priv->rx_ring[id].skb = skb; 196 return skb; 197 198 partial_error: 199 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE); 200 error: 201 dev_kfree_skb_any(skb); 202 return NULL; 203 } 204 205 static int ipoib_ib_post_receives(struct net_device *dev) 206 { 207 struct ipoib_dev_priv *priv = netdev_priv(dev); 208 int i; 209 210 for (i = 0; i < ipoib_recvq_size; ++i) { 211 if (!ipoib_alloc_rx_skb(dev, i)) { 212 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 213 return -ENOMEM; 214 } 215 if (ipoib_ib_post_receive(dev, i)) { 216 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 217 return -EIO; 218 } 219 } 220 221 return 0; 222 } 223 224 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 225 { 226 struct ipoib_dev_priv *priv = netdev_priv(dev); 227 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 228 struct sk_buff *skb; 229 u64 mapping[IPOIB_UD_RX_SG]; 230 union ib_gid *dgid; 231 232 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 233 wr_id, wc->status); 234 235 if (unlikely(wr_id >= ipoib_recvq_size)) { 236 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 237 wr_id, ipoib_recvq_size); 238 return; 239 } 240 241 skb = priv->rx_ring[wr_id].skb; 242 243 if (unlikely(wc->status != IB_WC_SUCCESS)) { 244 if (wc->status != IB_WC_WR_FLUSH_ERR) 245 ipoib_warn(priv, "failed recv event " 246 "(status=%d, wrid=%d vend_err %x)\n", 247 wc->status, wr_id, wc->vendor_err); 248 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 249 dev_kfree_skb_any(skb); 250 priv->rx_ring[wr_id].skb = NULL; 251 return; 252 } 253 254 /* 255 * Drop packets that this interface sent, ie multicast packets 256 * that the HCA has replicated. 257 */ 258 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 259 goto repost; 260 261 memcpy(mapping, priv->rx_ring[wr_id].mapping, 262 IPOIB_UD_RX_SG * sizeof *mapping); 263 264 /* 265 * If we can't allocate a new RX buffer, dump 266 * this packet and reuse the old buffer. 267 */ 268 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 269 ++dev->stats.rx_dropped; 270 goto repost; 271 } 272 273 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 274 wc->byte_len, wc->slid); 275 276 ipoib_ud_dma_unmap_rx(priv, mapping); 277 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len); 278 279 /* First byte of dgid signals multicast when 0xff */ 280 dgid = &((struct ib_grh *)skb->data)->dgid; 281 282 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) 283 skb->pkt_type = PACKET_HOST; 284 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) 285 skb->pkt_type = PACKET_BROADCAST; 286 else 287 skb->pkt_type = PACKET_MULTICAST; 288 289 skb_pull(skb, IB_GRH_BYTES); 290 291 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 292 skb_reset_mac_header(skb); 293 skb_pull(skb, IPOIB_ENCAP_LEN); 294 295 ++dev->stats.rx_packets; 296 dev->stats.rx_bytes += skb->len; 297 298 skb->dev = dev; 299 if ((dev->features & NETIF_F_RXCSUM) && 300 likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) 301 skb->ip_summed = CHECKSUM_UNNECESSARY; 302 303 napi_gro_receive(&priv->napi, skb); 304 305 repost: 306 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 307 ipoib_warn(priv, "ipoib_ib_post_receive failed " 308 "for buf %d\n", wr_id); 309 } 310 311 static int ipoib_dma_map_tx(struct ib_device *ca, 312 struct ipoib_tx_buf *tx_req) 313 { 314 struct sk_buff *skb = tx_req->skb; 315 u64 *mapping = tx_req->mapping; 316 int i; 317 int off; 318 319 if (skb_headlen(skb)) { 320 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 321 DMA_TO_DEVICE); 322 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 323 return -EIO; 324 325 off = 1; 326 } else 327 off = 0; 328 329 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 330 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 331 mapping[i + off] = ib_dma_map_page(ca, 332 skb_frag_page(frag), 333 frag->page_offset, skb_frag_size(frag), 334 DMA_TO_DEVICE); 335 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 336 goto partial_error; 337 } 338 return 0; 339 340 partial_error: 341 for (; i > 0; --i) { 342 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 343 344 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 345 } 346 347 if (off) 348 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 349 350 return -EIO; 351 } 352 353 static void ipoib_dma_unmap_tx(struct ib_device *ca, 354 struct ipoib_tx_buf *tx_req) 355 { 356 struct sk_buff *skb = tx_req->skb; 357 u64 *mapping = tx_req->mapping; 358 int i; 359 int off; 360 361 if (skb_headlen(skb)) { 362 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 363 off = 1; 364 } else 365 off = 0; 366 367 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 368 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 369 370 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag), 371 DMA_TO_DEVICE); 372 } 373 } 374 375 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 376 { 377 struct ipoib_dev_priv *priv = netdev_priv(dev); 378 unsigned int wr_id = wc->wr_id; 379 struct ipoib_tx_buf *tx_req; 380 381 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 382 wr_id, wc->status); 383 384 if (unlikely(wr_id >= ipoib_sendq_size)) { 385 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 386 wr_id, ipoib_sendq_size); 387 return; 388 } 389 390 tx_req = &priv->tx_ring[wr_id]; 391 392 ipoib_dma_unmap_tx(priv->ca, tx_req); 393 394 ++dev->stats.tx_packets; 395 dev->stats.tx_bytes += tx_req->skb->len; 396 397 dev_kfree_skb_any(tx_req->skb); 398 399 ++priv->tx_tail; 400 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 401 netif_queue_stopped(dev) && 402 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 403 netif_wake_queue(dev); 404 405 if (wc->status != IB_WC_SUCCESS && 406 wc->status != IB_WC_WR_FLUSH_ERR) 407 ipoib_warn(priv, "failed send event " 408 "(status=%d, wrid=%d vend_err %x)\n", 409 wc->status, wr_id, wc->vendor_err); 410 } 411 412 static int poll_tx(struct ipoib_dev_priv *priv) 413 { 414 int n, i; 415 416 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 417 for (i = 0; i < n; ++i) 418 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 419 420 return n == MAX_SEND_CQE; 421 } 422 423 int ipoib_poll(struct napi_struct *napi, int budget) 424 { 425 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 426 struct net_device *dev = priv->dev; 427 int done; 428 int t; 429 int n, i; 430 431 done = 0; 432 433 poll_more: 434 while (done < budget) { 435 int max = (budget - done); 436 437 t = min(IPOIB_NUM_WC, max); 438 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 439 440 for (i = 0; i < n; i++) { 441 struct ib_wc *wc = priv->ibwc + i; 442 443 if (wc->wr_id & IPOIB_OP_RECV) { 444 ++done; 445 if (wc->wr_id & IPOIB_OP_CM) 446 ipoib_cm_handle_rx_wc(dev, wc); 447 else 448 ipoib_ib_handle_rx_wc(dev, wc); 449 } else 450 ipoib_cm_handle_tx_wc(priv->dev, wc); 451 } 452 453 if (n != t) 454 break; 455 } 456 457 if (done < budget) { 458 napi_complete(napi); 459 if (unlikely(ib_req_notify_cq(priv->recv_cq, 460 IB_CQ_NEXT_COMP | 461 IB_CQ_REPORT_MISSED_EVENTS)) && 462 napi_reschedule(napi)) 463 goto poll_more; 464 } 465 466 return done; 467 } 468 469 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 470 { 471 struct net_device *dev = dev_ptr; 472 struct ipoib_dev_priv *priv = netdev_priv(dev); 473 474 napi_schedule(&priv->napi); 475 } 476 477 static void drain_tx_cq(struct net_device *dev) 478 { 479 struct ipoib_dev_priv *priv = netdev_priv(dev); 480 481 netif_tx_lock(dev); 482 while (poll_tx(priv)) 483 ; /* nothing */ 484 485 if (netif_queue_stopped(dev)) 486 mod_timer(&priv->poll_timer, jiffies + 1); 487 488 netif_tx_unlock(dev); 489 } 490 491 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 492 { 493 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 494 495 mod_timer(&priv->poll_timer, jiffies); 496 } 497 498 static inline int post_send(struct ipoib_dev_priv *priv, 499 unsigned int wr_id, 500 struct ib_ah *address, u32 qpn, 501 struct ipoib_tx_buf *tx_req, 502 void *head, int hlen) 503 { 504 struct ib_send_wr *bad_wr; 505 int i, off; 506 struct sk_buff *skb = tx_req->skb; 507 skb_frag_t *frags = skb_shinfo(skb)->frags; 508 int nr_frags = skb_shinfo(skb)->nr_frags; 509 u64 *mapping = tx_req->mapping; 510 511 if (skb_headlen(skb)) { 512 priv->tx_sge[0].addr = mapping[0]; 513 priv->tx_sge[0].length = skb_headlen(skb); 514 off = 1; 515 } else 516 off = 0; 517 518 for (i = 0; i < nr_frags; ++i) { 519 priv->tx_sge[i + off].addr = mapping[i + off]; 520 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]); 521 } 522 priv->tx_wr.num_sge = nr_frags + off; 523 priv->tx_wr.wr_id = wr_id; 524 priv->tx_wr.wr.ud.remote_qpn = qpn; 525 priv->tx_wr.wr.ud.ah = address; 526 527 if (head) { 528 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 529 priv->tx_wr.wr.ud.header = head; 530 priv->tx_wr.wr.ud.hlen = hlen; 531 priv->tx_wr.opcode = IB_WR_LSO; 532 } else 533 priv->tx_wr.opcode = IB_WR_SEND; 534 535 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 536 } 537 538 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 539 struct ipoib_ah *address, u32 qpn) 540 { 541 struct ipoib_dev_priv *priv = netdev_priv(dev); 542 struct ipoib_tx_buf *tx_req; 543 int hlen, rc; 544 void *phead; 545 546 if (skb_is_gso(skb)) { 547 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 548 phead = skb->data; 549 if (unlikely(!skb_pull(skb, hlen))) { 550 ipoib_warn(priv, "linear data too small\n"); 551 ++dev->stats.tx_dropped; 552 ++dev->stats.tx_errors; 553 dev_kfree_skb_any(skb); 554 return; 555 } 556 } else { 557 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 558 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 559 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 560 ++dev->stats.tx_dropped; 561 ++dev->stats.tx_errors; 562 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 563 return; 564 } 565 phead = NULL; 566 hlen = 0; 567 } 568 569 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 570 skb->len, address, qpn); 571 572 /* 573 * We put the skb into the tx_ring _before_ we call post_send() 574 * because it's entirely possible that the completion handler will 575 * run before we execute anything after the post_send(). That 576 * means we have to make sure everything is properly recorded and 577 * our state is consistent before we call post_send(). 578 */ 579 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 580 tx_req->skb = skb; 581 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 582 ++dev->stats.tx_errors; 583 dev_kfree_skb_any(skb); 584 return; 585 } 586 587 if (skb->ip_summed == CHECKSUM_PARTIAL) 588 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 589 else 590 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 591 592 if (++priv->tx_outstanding == ipoib_sendq_size) { 593 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 594 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 595 ipoib_warn(priv, "request notify on send CQ failed\n"); 596 netif_stop_queue(dev); 597 } 598 599 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 600 address->ah, qpn, tx_req, phead, hlen); 601 if (unlikely(rc)) { 602 ipoib_warn(priv, "post_send failed, error %d\n", rc); 603 ++dev->stats.tx_errors; 604 --priv->tx_outstanding; 605 ipoib_dma_unmap_tx(priv->ca, tx_req); 606 dev_kfree_skb_any(skb); 607 if (netif_queue_stopped(dev)) 608 netif_wake_queue(dev); 609 } else { 610 dev->trans_start = jiffies; 611 612 address->last_send = priv->tx_head; 613 ++priv->tx_head; 614 skb_orphan(skb); 615 616 } 617 618 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 619 while (poll_tx(priv)) 620 ; /* nothing */ 621 } 622 623 static void __ipoib_reap_ah(struct net_device *dev) 624 { 625 struct ipoib_dev_priv *priv = netdev_priv(dev); 626 struct ipoib_ah *ah, *tah; 627 LIST_HEAD(remove_list); 628 unsigned long flags; 629 630 netif_tx_lock_bh(dev); 631 spin_lock_irqsave(&priv->lock, flags); 632 633 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 634 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 635 list_del(&ah->list); 636 ib_destroy_ah(ah->ah); 637 kfree(ah); 638 } 639 640 spin_unlock_irqrestore(&priv->lock, flags); 641 netif_tx_unlock_bh(dev); 642 } 643 644 void ipoib_reap_ah(struct work_struct *work) 645 { 646 struct ipoib_dev_priv *priv = 647 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 648 struct net_device *dev = priv->dev; 649 650 __ipoib_reap_ah(dev); 651 652 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 653 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 654 round_jiffies_relative(HZ)); 655 } 656 657 static void ipoib_ib_tx_timer_func(unsigned long ctx) 658 { 659 drain_tx_cq((struct net_device *)ctx); 660 } 661 662 int ipoib_ib_dev_open(struct net_device *dev) 663 { 664 struct ipoib_dev_priv *priv = netdev_priv(dev); 665 int ret; 666 667 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { 668 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); 669 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 670 return -1; 671 } 672 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 673 674 ret = ipoib_init_qp(dev); 675 if (ret) { 676 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 677 return -1; 678 } 679 680 ret = ipoib_ib_post_receives(dev); 681 if (ret) { 682 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 683 ipoib_ib_dev_stop(dev, 1); 684 return -1; 685 } 686 687 ret = ipoib_cm_dev_open(dev); 688 if (ret) { 689 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 690 ipoib_ib_dev_stop(dev, 1); 691 return -1; 692 } 693 694 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 695 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 696 round_jiffies_relative(HZ)); 697 698 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 699 napi_enable(&priv->napi); 700 701 return 0; 702 } 703 704 static void ipoib_pkey_dev_check_presence(struct net_device *dev) 705 { 706 struct ipoib_dev_priv *priv = netdev_priv(dev); 707 u16 pkey_index = 0; 708 709 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) 710 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 711 else 712 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 713 } 714 715 int ipoib_ib_dev_up(struct net_device *dev) 716 { 717 struct ipoib_dev_priv *priv = netdev_priv(dev); 718 719 ipoib_pkey_dev_check_presence(dev); 720 721 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 722 ipoib_dbg(priv, "PKEY is not assigned.\n"); 723 return 0; 724 } 725 726 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 727 728 return ipoib_mcast_start_thread(dev); 729 } 730 731 int ipoib_ib_dev_down(struct net_device *dev, int flush) 732 { 733 struct ipoib_dev_priv *priv = netdev_priv(dev); 734 735 ipoib_dbg(priv, "downing ib_dev\n"); 736 737 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 738 netif_carrier_off(dev); 739 740 /* Shutdown the P_Key thread if still active */ 741 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 742 mutex_lock(&pkey_mutex); 743 set_bit(IPOIB_PKEY_STOP, &priv->flags); 744 cancel_delayed_work(&priv->pkey_poll_task); 745 mutex_unlock(&pkey_mutex); 746 if (flush) 747 flush_workqueue(ipoib_workqueue); 748 } 749 750 ipoib_mcast_stop_thread(dev, flush); 751 ipoib_mcast_dev_flush(dev); 752 753 ipoib_flush_paths(dev); 754 755 return 0; 756 } 757 758 static int recvs_pending(struct net_device *dev) 759 { 760 struct ipoib_dev_priv *priv = netdev_priv(dev); 761 int pending = 0; 762 int i; 763 764 for (i = 0; i < ipoib_recvq_size; ++i) 765 if (priv->rx_ring[i].skb) 766 ++pending; 767 768 return pending; 769 } 770 771 void ipoib_drain_cq(struct net_device *dev) 772 { 773 struct ipoib_dev_priv *priv = netdev_priv(dev); 774 int i, n; 775 776 /* 777 * We call completion handling routines that expect to be 778 * called from the BH-disabled NAPI poll context, so disable 779 * BHs here too. 780 */ 781 local_bh_disable(); 782 783 do { 784 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc); 785 for (i = 0; i < n; ++i) { 786 /* 787 * Convert any successful completions to flush 788 * errors to avoid passing packets up the 789 * stack after bringing the device down. 790 */ 791 if (priv->ibwc[i].status == IB_WC_SUCCESS) 792 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR; 793 794 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) { 795 if (priv->ibwc[i].wr_id & IPOIB_OP_CM) 796 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i); 797 else 798 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); 799 } else 800 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i); 801 } 802 } while (n == IPOIB_NUM_WC); 803 804 while (poll_tx(priv)) 805 ; /* nothing */ 806 807 local_bh_enable(); 808 } 809 810 int ipoib_ib_dev_stop(struct net_device *dev, int flush) 811 { 812 struct ipoib_dev_priv *priv = netdev_priv(dev); 813 struct ib_qp_attr qp_attr; 814 unsigned long begin; 815 struct ipoib_tx_buf *tx_req; 816 int i; 817 818 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 819 napi_disable(&priv->napi); 820 821 ipoib_cm_dev_stop(dev); 822 823 /* 824 * Move our QP to the error state and then reinitialize in 825 * when all work requests have completed or have been flushed. 826 */ 827 qp_attr.qp_state = IB_QPS_ERR; 828 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 829 ipoib_warn(priv, "Failed to modify QP to ERROR state\n"); 830 831 /* Wait for all sends and receives to complete */ 832 begin = jiffies; 833 834 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) { 835 if (time_after(jiffies, begin + 5 * HZ)) { 836 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n", 837 priv->tx_head - priv->tx_tail, recvs_pending(dev)); 838 839 /* 840 * assume the HW is wedged and just free up 841 * all our pending work requests. 842 */ 843 while ((int) priv->tx_tail - (int) priv->tx_head < 0) { 844 tx_req = &priv->tx_ring[priv->tx_tail & 845 (ipoib_sendq_size - 1)]; 846 ipoib_dma_unmap_tx(priv->ca, tx_req); 847 dev_kfree_skb_any(tx_req->skb); 848 ++priv->tx_tail; 849 --priv->tx_outstanding; 850 } 851 852 for (i = 0; i < ipoib_recvq_size; ++i) { 853 struct ipoib_rx_buf *rx_req; 854 855 rx_req = &priv->rx_ring[i]; 856 if (!rx_req->skb) 857 continue; 858 ipoib_ud_dma_unmap_rx(priv, 859 priv->rx_ring[i].mapping); 860 dev_kfree_skb_any(rx_req->skb); 861 rx_req->skb = NULL; 862 } 863 864 goto timeout; 865 } 866 867 ipoib_drain_cq(dev); 868 869 msleep(1); 870 } 871 872 ipoib_dbg(priv, "All sends and receives done.\n"); 873 874 timeout: 875 del_timer_sync(&priv->poll_timer); 876 qp_attr.qp_state = IB_QPS_RESET; 877 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE)) 878 ipoib_warn(priv, "Failed to modify QP to RESET state\n"); 879 880 /* Wait for all AHs to be reaped */ 881 set_bit(IPOIB_STOP_REAPER, &priv->flags); 882 cancel_delayed_work(&priv->ah_reap_task); 883 if (flush) 884 flush_workqueue(ipoib_workqueue); 885 886 begin = jiffies; 887 888 while (!list_empty(&priv->dead_ahs)) { 889 __ipoib_reap_ah(dev); 890 891 if (time_after(jiffies, begin + HZ)) { 892 ipoib_warn(priv, "timing out; will leak address handles\n"); 893 break; 894 } 895 896 msleep(1); 897 } 898 899 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP); 900 901 return 0; 902 } 903 904 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 905 { 906 struct ipoib_dev_priv *priv = netdev_priv(dev); 907 908 priv->ca = ca; 909 priv->port = port; 910 priv->qp = NULL; 911 912 if (ipoib_transport_dev_init(dev, ca)) { 913 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name); 914 return -ENODEV; 915 } 916 917 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 918 (unsigned long) dev); 919 920 if (dev->flags & IFF_UP) { 921 if (ipoib_ib_dev_open(dev)) { 922 ipoib_transport_dev_cleanup(dev); 923 return -ENODEV; 924 } 925 } 926 927 return 0; 928 } 929 930 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 931 enum ipoib_flush_level level) 932 { 933 struct ipoib_dev_priv *cpriv; 934 struct net_device *dev = priv->dev; 935 u16 new_index; 936 937 mutex_lock(&priv->vlan_mutex); 938 939 /* 940 * Flush any child interfaces too -- they might be up even if 941 * the parent is down. 942 */ 943 list_for_each_entry(cpriv, &priv->child_intfs, list) 944 __ipoib_ib_dev_flush(cpriv, level); 945 946 mutex_unlock(&priv->vlan_mutex); 947 948 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { 949 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 950 return; 951 } 952 953 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 954 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 955 return; 956 } 957 958 if (level == IPOIB_FLUSH_HEAVY) { 959 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { 960 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 961 ipoib_ib_dev_down(dev, 0); 962 ipoib_ib_dev_stop(dev, 0); 963 if (ipoib_pkey_dev_delay_open(dev)) 964 return; 965 } 966 967 /* restart QP only if P_Key index is changed */ 968 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 969 new_index == priv->pkey_index) { 970 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 971 return; 972 } 973 priv->pkey_index = new_index; 974 } 975 976 if (level == IPOIB_FLUSH_LIGHT) { 977 ipoib_mark_paths_invalid(dev); 978 ipoib_mcast_dev_flush(dev); 979 } 980 981 if (level >= IPOIB_FLUSH_NORMAL) 982 ipoib_ib_dev_down(dev, 0); 983 984 if (level == IPOIB_FLUSH_HEAVY) { 985 ipoib_ib_dev_stop(dev, 0); 986 ipoib_ib_dev_open(dev); 987 } 988 989 /* 990 * The device could have been brought down between the start and when 991 * we get here, don't bring it back up if it's not configured up 992 */ 993 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 994 if (level >= IPOIB_FLUSH_NORMAL) 995 ipoib_ib_dev_up(dev); 996 ipoib_mcast_restart_task(&priv->restart_task); 997 } 998 } 999 1000 void ipoib_ib_dev_flush_light(struct work_struct *work) 1001 { 1002 struct ipoib_dev_priv *priv = 1003 container_of(work, struct ipoib_dev_priv, flush_light); 1004 1005 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 1006 } 1007 1008 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1009 { 1010 struct ipoib_dev_priv *priv = 1011 container_of(work, struct ipoib_dev_priv, flush_normal); 1012 1013 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1014 } 1015 1016 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1017 { 1018 struct ipoib_dev_priv *priv = 1019 container_of(work, struct ipoib_dev_priv, flush_heavy); 1020 1021 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1022 } 1023 1024 void ipoib_ib_dev_cleanup(struct net_device *dev) 1025 { 1026 struct ipoib_dev_priv *priv = netdev_priv(dev); 1027 1028 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1029 1030 ipoib_mcast_stop_thread(dev, 1); 1031 ipoib_mcast_dev_flush(dev); 1032 1033 ipoib_transport_dev_cleanup(dev); 1034 } 1035 1036 /* 1037 * Delayed P_Key Assigment Interim Support 1038 * 1039 * The following is initial implementation of delayed P_Key assigment 1040 * mechanism. It is using the same approach implemented for the multicast 1041 * group join. The single goal of this implementation is to quickly address 1042 * Bug #2507. This implementation will probably be removed when the P_Key 1043 * change async notification is available. 1044 */ 1045 1046 void ipoib_pkey_poll(struct work_struct *work) 1047 { 1048 struct ipoib_dev_priv *priv = 1049 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work); 1050 struct net_device *dev = priv->dev; 1051 1052 ipoib_pkey_dev_check_presence(dev); 1053 1054 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 1055 ipoib_open(dev); 1056 else { 1057 mutex_lock(&pkey_mutex); 1058 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags)) 1059 queue_delayed_work(ipoib_workqueue, 1060 &priv->pkey_poll_task, 1061 HZ); 1062 mutex_unlock(&pkey_mutex); 1063 } 1064 } 1065 1066 int ipoib_pkey_dev_delay_open(struct net_device *dev) 1067 { 1068 struct ipoib_dev_priv *priv = netdev_priv(dev); 1069 1070 /* Look for the interface pkey value in the IB Port P_Key table and */ 1071 /* set the interface pkey assigment flag */ 1072 ipoib_pkey_dev_check_presence(dev); 1073 1074 /* P_Key value not assigned yet - start polling */ 1075 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 1076 mutex_lock(&pkey_mutex); 1077 clear_bit(IPOIB_PKEY_STOP, &priv->flags); 1078 queue_delayed_work(ipoib_workqueue, 1079 &priv->pkey_poll_task, 1080 HZ); 1081 mutex_unlock(&pkey_mutex); 1082 return 1; 1083 } 1084 1085 return 0; 1086 } 1087