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 += PAGE_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 int tailroom; 160 u64 *mapping; 161 162 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 163 buf_size = IPOIB_UD_HEAD_SIZE; 164 tailroom = 128; /* reserve some tailroom for IP/TCP headers */ 165 } else { 166 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu); 167 tailroom = 0; 168 } 169 170 skb = dev_alloc_skb(buf_size + tailroom + 4); 171 if (unlikely(!skb)) 172 return NULL; 173 174 /* 175 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte 176 * header. So we need 4 more bytes to get to 48 and align the 177 * IP header to a multiple of 16. 178 */ 179 skb_reserve(skb, 4); 180 181 mapping = priv->rx_ring[id].mapping; 182 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size, 183 DMA_FROM_DEVICE); 184 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) 185 goto error; 186 187 if (ipoib_ud_need_sg(priv->max_ib_mtu)) { 188 struct page *page = alloc_page(GFP_ATOMIC); 189 if (!page) 190 goto partial_error; 191 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE); 192 mapping[1] = 193 ib_dma_map_page(priv->ca, page, 194 0, PAGE_SIZE, DMA_FROM_DEVICE); 195 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1]))) 196 goto partial_error; 197 } 198 199 priv->rx_ring[id].skb = skb; 200 return skb; 201 202 partial_error: 203 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE); 204 error: 205 dev_kfree_skb_any(skb); 206 return NULL; 207 } 208 209 static int ipoib_ib_post_receives(struct net_device *dev) 210 { 211 struct ipoib_dev_priv *priv = netdev_priv(dev); 212 int i; 213 214 for (i = 0; i < ipoib_recvq_size; ++i) { 215 if (!ipoib_alloc_rx_skb(dev, i)) { 216 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 217 return -ENOMEM; 218 } 219 if (ipoib_ib_post_receive(dev, i)) { 220 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); 221 return -EIO; 222 } 223 } 224 225 return 0; 226 } 227 228 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 229 { 230 struct ipoib_dev_priv *priv = netdev_priv(dev); 231 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV; 232 struct sk_buff *skb; 233 u64 mapping[IPOIB_UD_RX_SG]; 234 union ib_gid *dgid; 235 236 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n", 237 wr_id, wc->status); 238 239 if (unlikely(wr_id >= ipoib_recvq_size)) { 240 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n", 241 wr_id, ipoib_recvq_size); 242 return; 243 } 244 245 skb = priv->rx_ring[wr_id].skb; 246 247 if (unlikely(wc->status != IB_WC_SUCCESS)) { 248 if (wc->status != IB_WC_WR_FLUSH_ERR) 249 ipoib_warn(priv, "failed recv event " 250 "(status=%d, wrid=%d vend_err %x)\n", 251 wc->status, wr_id, wc->vendor_err); 252 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping); 253 dev_kfree_skb_any(skb); 254 priv->rx_ring[wr_id].skb = NULL; 255 return; 256 } 257 258 /* 259 * Drop packets that this interface sent, ie multicast packets 260 * that the HCA has replicated. 261 */ 262 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) 263 goto repost; 264 265 memcpy(mapping, priv->rx_ring[wr_id].mapping, 266 IPOIB_UD_RX_SG * sizeof *mapping); 267 268 /* 269 * If we can't allocate a new RX buffer, dump 270 * this packet and reuse the old buffer. 271 */ 272 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) { 273 ++dev->stats.rx_dropped; 274 goto repost; 275 } 276 277 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 278 wc->byte_len, wc->slid); 279 280 ipoib_ud_dma_unmap_rx(priv, mapping); 281 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len); 282 283 /* First byte of dgid signals multicast when 0xff */ 284 dgid = &((struct ib_grh *)skb->data)->dgid; 285 286 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff) 287 skb->pkt_type = PACKET_HOST; 288 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0) 289 skb->pkt_type = PACKET_BROADCAST; 290 else 291 skb->pkt_type = PACKET_MULTICAST; 292 293 skb_pull(skb, IB_GRH_BYTES); 294 295 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 296 skb_reset_mac_header(skb); 297 skb_pull(skb, IPOIB_ENCAP_LEN); 298 299 ++dev->stats.rx_packets; 300 dev->stats.rx_bytes += skb->len; 301 302 skb->dev = dev; 303 if ((dev->features & NETIF_F_RXCSUM) && 304 likely(wc->wc_flags & IB_WC_IP_CSUM_OK)) 305 skb->ip_summed = CHECKSUM_UNNECESSARY; 306 307 napi_gro_receive(&priv->napi, skb); 308 309 repost: 310 if (unlikely(ipoib_ib_post_receive(dev, wr_id))) 311 ipoib_warn(priv, "ipoib_ib_post_receive failed " 312 "for buf %d\n", wr_id); 313 } 314 315 static int ipoib_dma_map_tx(struct ib_device *ca, 316 struct ipoib_tx_buf *tx_req) 317 { 318 struct sk_buff *skb = tx_req->skb; 319 u64 *mapping = tx_req->mapping; 320 int i; 321 int off; 322 323 if (skb_headlen(skb)) { 324 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb), 325 DMA_TO_DEVICE); 326 if (unlikely(ib_dma_mapping_error(ca, mapping[0]))) 327 return -EIO; 328 329 off = 1; 330 } else 331 off = 0; 332 333 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 334 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 335 mapping[i + off] = ib_dma_map_page(ca, 336 skb_frag_page(frag), 337 frag->page_offset, skb_frag_size(frag), 338 DMA_TO_DEVICE); 339 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off]))) 340 goto partial_error; 341 } 342 return 0; 343 344 partial_error: 345 for (; i > 0; --i) { 346 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 347 348 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE); 349 } 350 351 if (off) 352 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 353 354 return -EIO; 355 } 356 357 static void ipoib_dma_unmap_tx(struct ib_device *ca, 358 struct ipoib_tx_buf *tx_req) 359 { 360 struct sk_buff *skb = tx_req->skb; 361 u64 *mapping = tx_req->mapping; 362 int i; 363 int off; 364 365 if (skb_headlen(skb)) { 366 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE); 367 off = 1; 368 } else 369 off = 0; 370 371 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) { 372 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 373 374 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag), 375 DMA_TO_DEVICE); 376 } 377 } 378 379 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 380 { 381 struct ipoib_dev_priv *priv = netdev_priv(dev); 382 unsigned int wr_id = wc->wr_id; 383 struct ipoib_tx_buf *tx_req; 384 385 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n", 386 wr_id, wc->status); 387 388 if (unlikely(wr_id >= ipoib_sendq_size)) { 389 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n", 390 wr_id, ipoib_sendq_size); 391 return; 392 } 393 394 tx_req = &priv->tx_ring[wr_id]; 395 396 ipoib_dma_unmap_tx(priv->ca, tx_req); 397 398 ++dev->stats.tx_packets; 399 dev->stats.tx_bytes += tx_req->skb->len; 400 401 dev_kfree_skb_any(tx_req->skb); 402 403 ++priv->tx_tail; 404 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 405 netif_queue_stopped(dev) && 406 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 407 netif_wake_queue(dev); 408 409 if (wc->status != IB_WC_SUCCESS && 410 wc->status != IB_WC_WR_FLUSH_ERR) 411 ipoib_warn(priv, "failed send event " 412 "(status=%d, wrid=%d vend_err %x)\n", 413 wc->status, wr_id, wc->vendor_err); 414 } 415 416 static int poll_tx(struct ipoib_dev_priv *priv) 417 { 418 int n, i; 419 420 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc); 421 for (i = 0; i < n; ++i) 422 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i); 423 424 return n == MAX_SEND_CQE; 425 } 426 427 int ipoib_poll(struct napi_struct *napi, int budget) 428 { 429 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi); 430 struct net_device *dev = priv->dev; 431 int done; 432 int t; 433 int n, i; 434 435 done = 0; 436 437 poll_more: 438 while (done < budget) { 439 int max = (budget - done); 440 441 t = min(IPOIB_NUM_WC, max); 442 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc); 443 444 for (i = 0; i < n; i++) { 445 struct ib_wc *wc = priv->ibwc + i; 446 447 if (wc->wr_id & IPOIB_OP_RECV) { 448 ++done; 449 if (wc->wr_id & IPOIB_OP_CM) 450 ipoib_cm_handle_rx_wc(dev, wc); 451 else 452 ipoib_ib_handle_rx_wc(dev, wc); 453 } else 454 ipoib_cm_handle_tx_wc(priv->dev, wc); 455 } 456 457 if (n != t) 458 break; 459 } 460 461 if (done < budget) { 462 napi_complete(napi); 463 if (unlikely(ib_req_notify_cq(priv->recv_cq, 464 IB_CQ_NEXT_COMP | 465 IB_CQ_REPORT_MISSED_EVENTS)) && 466 napi_reschedule(napi)) 467 goto poll_more; 468 } 469 470 return done; 471 } 472 473 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) 474 { 475 struct net_device *dev = dev_ptr; 476 struct ipoib_dev_priv *priv = netdev_priv(dev); 477 478 napi_schedule(&priv->napi); 479 } 480 481 static void drain_tx_cq(struct net_device *dev) 482 { 483 struct ipoib_dev_priv *priv = netdev_priv(dev); 484 485 netif_tx_lock(dev); 486 while (poll_tx(priv)) 487 ; /* nothing */ 488 489 if (netif_queue_stopped(dev)) 490 mod_timer(&priv->poll_timer, jiffies + 1); 491 492 netif_tx_unlock(dev); 493 } 494 495 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr) 496 { 497 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr); 498 499 mod_timer(&priv->poll_timer, jiffies); 500 } 501 502 static inline int post_send(struct ipoib_dev_priv *priv, 503 unsigned int wr_id, 504 struct ib_ah *address, u32 qpn, 505 struct ipoib_tx_buf *tx_req, 506 void *head, int hlen) 507 { 508 struct ib_send_wr *bad_wr; 509 int i, off; 510 struct sk_buff *skb = tx_req->skb; 511 skb_frag_t *frags = skb_shinfo(skb)->frags; 512 int nr_frags = skb_shinfo(skb)->nr_frags; 513 u64 *mapping = tx_req->mapping; 514 515 if (skb_headlen(skb)) { 516 priv->tx_sge[0].addr = mapping[0]; 517 priv->tx_sge[0].length = skb_headlen(skb); 518 off = 1; 519 } else 520 off = 0; 521 522 for (i = 0; i < nr_frags; ++i) { 523 priv->tx_sge[i + off].addr = mapping[i + off]; 524 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]); 525 } 526 priv->tx_wr.num_sge = nr_frags + off; 527 priv->tx_wr.wr_id = wr_id; 528 priv->tx_wr.wr.ud.remote_qpn = qpn; 529 priv->tx_wr.wr.ud.ah = address; 530 531 if (head) { 532 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size; 533 priv->tx_wr.wr.ud.header = head; 534 priv->tx_wr.wr.ud.hlen = hlen; 535 priv->tx_wr.opcode = IB_WR_LSO; 536 } else 537 priv->tx_wr.opcode = IB_WR_SEND; 538 539 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr); 540 } 541 542 void ipoib_send(struct net_device *dev, struct sk_buff *skb, 543 struct ipoib_ah *address, u32 qpn) 544 { 545 struct ipoib_dev_priv *priv = netdev_priv(dev); 546 struct ipoib_tx_buf *tx_req; 547 int hlen, rc; 548 void *phead; 549 550 if (skb_is_gso(skb)) { 551 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb); 552 phead = skb->data; 553 if (unlikely(!skb_pull(skb, hlen))) { 554 ipoib_warn(priv, "linear data too small\n"); 555 ++dev->stats.tx_dropped; 556 ++dev->stats.tx_errors; 557 dev_kfree_skb_any(skb); 558 return; 559 } 560 } else { 561 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) { 562 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 563 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN); 564 ++dev->stats.tx_dropped; 565 ++dev->stats.tx_errors; 566 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu); 567 return; 568 } 569 phead = NULL; 570 hlen = 0; 571 } 572 573 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n", 574 skb->len, address, qpn); 575 576 /* 577 * We put the skb into the tx_ring _before_ we call post_send() 578 * because it's entirely possible that the completion handler will 579 * run before we execute anything after the post_send(). That 580 * means we have to make sure everything is properly recorded and 581 * our state is consistent before we call post_send(). 582 */ 583 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)]; 584 tx_req->skb = skb; 585 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 586 ++dev->stats.tx_errors; 587 dev_kfree_skb_any(skb); 588 return; 589 } 590 591 if (skb->ip_summed == CHECKSUM_PARTIAL) 592 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM; 593 else 594 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM; 595 596 if (++priv->tx_outstanding == ipoib_sendq_size) { 597 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n"); 598 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) 599 ipoib_warn(priv, "request notify on send CQ failed\n"); 600 netif_stop_queue(dev); 601 } 602 603 skb_orphan(skb); 604 skb_dst_drop(skb); 605 606 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1), 607 address->ah, qpn, tx_req, phead, hlen); 608 if (unlikely(rc)) { 609 ipoib_warn(priv, "post_send failed, error %d\n", rc); 610 ++dev->stats.tx_errors; 611 --priv->tx_outstanding; 612 ipoib_dma_unmap_tx(priv->ca, tx_req); 613 dev_kfree_skb_any(skb); 614 if (netif_queue_stopped(dev)) 615 netif_wake_queue(dev); 616 } else { 617 dev->trans_start = jiffies; 618 619 address->last_send = priv->tx_head; 620 ++priv->tx_head; 621 } 622 623 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE)) 624 while (poll_tx(priv)) 625 ; /* nothing */ 626 } 627 628 static void __ipoib_reap_ah(struct net_device *dev) 629 { 630 struct ipoib_dev_priv *priv = netdev_priv(dev); 631 struct ipoib_ah *ah, *tah; 632 LIST_HEAD(remove_list); 633 unsigned long flags; 634 635 netif_tx_lock_bh(dev); 636 spin_lock_irqsave(&priv->lock, flags); 637 638 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list) 639 if ((int) priv->tx_tail - (int) ah->last_send >= 0) { 640 list_del(&ah->list); 641 ib_destroy_ah(ah->ah); 642 kfree(ah); 643 } 644 645 spin_unlock_irqrestore(&priv->lock, flags); 646 netif_tx_unlock_bh(dev); 647 } 648 649 void ipoib_reap_ah(struct work_struct *work) 650 { 651 struct ipoib_dev_priv *priv = 652 container_of(work, struct ipoib_dev_priv, ah_reap_task.work); 653 struct net_device *dev = priv->dev; 654 655 __ipoib_reap_ah(dev); 656 657 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags)) 658 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 659 round_jiffies_relative(HZ)); 660 } 661 662 static void ipoib_ib_tx_timer_func(unsigned long ctx) 663 { 664 drain_tx_cq((struct net_device *)ctx); 665 } 666 667 int ipoib_ib_dev_open(struct net_device *dev, int flush) 668 { 669 struct ipoib_dev_priv *priv = netdev_priv(dev); 670 int ret; 671 672 ipoib_pkey_dev_check_presence(dev); 673 674 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 675 ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, 676 (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); 677 return -1; 678 } 679 680 ret = ipoib_init_qp(dev); 681 if (ret) { 682 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret); 683 return -1; 684 } 685 686 ret = ipoib_ib_post_receives(dev); 687 if (ret) { 688 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret); 689 goto dev_stop; 690 } 691 692 ret = ipoib_cm_dev_open(dev); 693 if (ret) { 694 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret); 695 goto dev_stop; 696 } 697 698 clear_bit(IPOIB_STOP_REAPER, &priv->flags); 699 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, 700 round_jiffies_relative(HZ)); 701 702 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 703 napi_enable(&priv->napi); 704 705 return 0; 706 dev_stop: 707 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 708 napi_enable(&priv->napi); 709 ipoib_ib_dev_stop(dev, flush); 710 return -1; 711 } 712 713 void ipoib_pkey_dev_check_presence(struct net_device *dev) 714 { 715 struct ipoib_dev_priv *priv = netdev_priv(dev); 716 717 if (!(priv->pkey & 0x7fff) || 718 ib_find_pkey(priv->ca, priv->port, priv->pkey, 719 &priv->pkey_index)) 720 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 721 else 722 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); 723 } 724 725 int ipoib_ib_dev_up(struct net_device *dev) 726 { 727 struct ipoib_dev_priv *priv = netdev_priv(dev); 728 729 ipoib_pkey_dev_check_presence(dev); 730 731 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { 732 ipoib_dbg(priv, "PKEY is not assigned.\n"); 733 return 0; 734 } 735 736 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 737 738 return ipoib_mcast_start_thread(dev); 739 } 740 741 int ipoib_ib_dev_down(struct net_device *dev, int flush) 742 { 743 struct ipoib_dev_priv *priv = netdev_priv(dev); 744 745 ipoib_dbg(priv, "downing ib_dev\n"); 746 747 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags); 748 netif_carrier_off(dev); 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, 1)) { 922 ipoib_transport_dev_cleanup(dev); 923 return -ENODEV; 924 } 925 } 926 927 return 0; 928 } 929 930 /* 931 * Takes whatever value which is in pkey index 0 and updates priv->pkey 932 * returns 0 if the pkey value was changed. 933 */ 934 static inline int update_parent_pkey(struct ipoib_dev_priv *priv) 935 { 936 int result; 937 u16 prev_pkey; 938 939 prev_pkey = priv->pkey; 940 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 941 if (result) { 942 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n", 943 priv->port, result); 944 return result; 945 } 946 947 priv->pkey |= 0x8000; 948 949 if (prev_pkey != priv->pkey) { 950 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n", 951 prev_pkey, priv->pkey); 952 /* 953 * Update the pkey in the broadcast address, while making sure to set 954 * the full membership bit, so that we join the right broadcast group. 955 */ 956 priv->dev->broadcast[8] = priv->pkey >> 8; 957 priv->dev->broadcast[9] = priv->pkey & 0xff; 958 return 0; 959 } 960 961 return 1; 962 } 963 /* 964 * returns 0 if pkey value was found in a different slot. 965 */ 966 static inline int update_child_pkey(struct ipoib_dev_priv *priv) 967 { 968 u16 old_index = priv->pkey_index; 969 970 priv->pkey_index = 0; 971 ipoib_pkey_dev_check_presence(priv->dev); 972 973 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && 974 (old_index == priv->pkey_index)) 975 return 1; 976 return 0; 977 } 978 979 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, 980 enum ipoib_flush_level level) 981 { 982 struct ipoib_dev_priv *cpriv; 983 struct net_device *dev = priv->dev; 984 int result; 985 986 down_read(&priv->vlan_rwsem); 987 988 /* 989 * Flush any child interfaces too -- they might be up even if 990 * the parent is down. 991 */ 992 list_for_each_entry(cpriv, &priv->child_intfs, list) 993 __ipoib_ib_dev_flush(cpriv, level); 994 995 up_read(&priv->vlan_rwsem); 996 997 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && 998 level != IPOIB_FLUSH_HEAVY) { 999 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); 1000 return; 1001 } 1002 1003 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1004 /* interface is down. update pkey and leave. */ 1005 if (level == IPOIB_FLUSH_HEAVY) { 1006 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1007 update_parent_pkey(priv); 1008 else 1009 update_child_pkey(priv); 1010 } 1011 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); 1012 return; 1013 } 1014 1015 if (level == IPOIB_FLUSH_HEAVY) { 1016 /* child devices chase their origin pkey value, while non-child 1017 * (parent) devices should always takes what present in pkey index 0 1018 */ 1019 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1020 result = update_child_pkey(priv); 1021 if (result) { 1022 /* restart QP only if P_Key index is changed */ 1023 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); 1024 return; 1025 } 1026 1027 } else { 1028 result = update_parent_pkey(priv); 1029 /* restart QP only if P_Key value changed */ 1030 if (result) { 1031 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n"); 1032 return; 1033 } 1034 } 1035 } 1036 1037 if (level == IPOIB_FLUSH_LIGHT) { 1038 ipoib_mark_paths_invalid(dev); 1039 ipoib_mcast_dev_flush(dev); 1040 } 1041 1042 if (level >= IPOIB_FLUSH_NORMAL) 1043 ipoib_ib_dev_down(dev, 0); 1044 1045 if (level == IPOIB_FLUSH_HEAVY) { 1046 if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) 1047 ipoib_ib_dev_stop(dev, 0); 1048 if (ipoib_ib_dev_open(dev, 0) != 0) 1049 return; 1050 if (netif_queue_stopped(dev)) 1051 netif_start_queue(dev); 1052 } 1053 1054 /* 1055 * The device could have been brought down between the start and when 1056 * we get here, don't bring it back up if it's not configured up 1057 */ 1058 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { 1059 if (level >= IPOIB_FLUSH_NORMAL) 1060 ipoib_ib_dev_up(dev); 1061 ipoib_mcast_restart_task(&priv->restart_task); 1062 } 1063 } 1064 1065 void ipoib_ib_dev_flush_light(struct work_struct *work) 1066 { 1067 struct ipoib_dev_priv *priv = 1068 container_of(work, struct ipoib_dev_priv, flush_light); 1069 1070 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT); 1071 } 1072 1073 void ipoib_ib_dev_flush_normal(struct work_struct *work) 1074 { 1075 struct ipoib_dev_priv *priv = 1076 container_of(work, struct ipoib_dev_priv, flush_normal); 1077 1078 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL); 1079 } 1080 1081 void ipoib_ib_dev_flush_heavy(struct work_struct *work) 1082 { 1083 struct ipoib_dev_priv *priv = 1084 container_of(work, struct ipoib_dev_priv, flush_heavy); 1085 1086 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY); 1087 } 1088 1089 void ipoib_ib_dev_cleanup(struct net_device *dev) 1090 { 1091 struct ipoib_dev_priv *priv = netdev_priv(dev); 1092 1093 ipoib_dbg(priv, "cleaning up ib_dev\n"); 1094 /* 1095 * We must make sure there are no more (path) completions 1096 * that may wish to touch priv fields that are no longer valid 1097 */ 1098 ipoib_flush_paths(dev); 1099 1100 ipoib_mcast_stop_thread(dev, 1); 1101 ipoib_mcast_dev_flush(dev); 1102 1103 ipoib_transport_dev_cleanup(dev); 1104 } 1105 1106 1107