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 44 int ipoib_max_conn_qp = 128; 45 46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 47 MODULE_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 52 static int data_debug_level; 53 54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 55 MODULE_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 66 static 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 72 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 73 .opcode = IB_WR_SEND, 74 }; 75 76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 77 struct ib_cm_event *event); 78 79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 80 u64 mapping[IPOIB_CM_RX_SG]) 81 { 82 int i; 83 84 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 85 86 for (i = 0; i < frags; ++i) 87 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 88 } 89 90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 91 { 92 struct ipoib_dev_priv *priv = netdev_priv(dev); 93 struct ib_recv_wr *bad_wr; 94 int i, ret; 95 96 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 97 98 for (i = 0; i < priv->cm.num_frags; ++i) 99 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 100 101 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 102 if (unlikely(ret)) { 103 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 104 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 105 priv->cm.srq_ring[id].mapping); 106 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 107 priv->cm.srq_ring[id].skb = NULL; 108 } 109 110 return ret; 111 } 112 113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 114 struct ipoib_cm_rx *rx, 115 struct ib_recv_wr *wr, 116 struct ib_sge *sge, int id) 117 { 118 struct ipoib_dev_priv *priv = netdev_priv(dev); 119 struct ib_recv_wr *bad_wr; 120 int i, ret; 121 122 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 123 124 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 125 sge[i].addr = rx->rx_ring[id].mapping[i]; 126 127 ret = ib_post_recv(rx->qp, wr, &bad_wr); 128 if (unlikely(ret)) { 129 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 130 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 131 rx->rx_ring[id].mapping); 132 dev_kfree_skb_any(rx->rx_ring[id].skb); 133 rx->rx_ring[id].skb = NULL; 134 } 135 136 return ret; 137 } 138 139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 140 struct ipoib_cm_rx_buf *rx_ring, 141 int id, int frags, 142 u64 mapping[IPOIB_CM_RX_SG], 143 gfp_t gfp) 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); 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; 181 182 partial_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 } 192 193 static 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 } 208 209 static 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 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID; 226 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 227 ipoib_warn(priv, "failed to post drain wr\n"); 228 229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 230 } 231 232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 233 { 234 struct ipoib_cm_rx *p = ctx; 235 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 236 unsigned long flags; 237 238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 239 return; 240 241 spin_lock_irqsave(&priv->lock, flags); 242 list_move(&p->list, &priv->cm.rx_flush_list); 243 p->state = IPOIB_CM_RX_FLUSH; 244 ipoib_cm_start_rx_drain(priv); 245 spin_unlock_irqrestore(&priv->lock, flags); 246 } 247 248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 249 struct ipoib_cm_rx *p) 250 { 251 struct ipoib_dev_priv *priv = netdev_priv(dev); 252 struct ib_qp_init_attr attr = { 253 .event_handler = ipoib_cm_rx_event_handler, 254 .send_cq = priv->recv_cq, /* For drain WR */ 255 .recv_cq = priv->recv_cq, 256 .srq = priv->cm.srq, 257 .cap.max_send_wr = 1, /* For drain WR */ 258 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 259 .sq_sig_type = IB_SIGNAL_ALL_WR, 260 .qp_type = IB_QPT_RC, 261 .qp_context = p, 262 }; 263 264 if (!ipoib_cm_has_srq(dev)) { 265 attr.cap.max_recv_wr = ipoib_recvq_size; 266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 267 } 268 269 return ib_create_qp(priv->pd, &attr); 270 } 271 272 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 273 struct ib_cm_id *cm_id, struct ib_qp *qp, 274 unsigned psn) 275 { 276 struct ipoib_dev_priv *priv = netdev_priv(dev); 277 struct ib_qp_attr qp_attr; 278 int qp_attr_mask, ret; 279 280 qp_attr.qp_state = IB_QPS_INIT; 281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 282 if (ret) { 283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 284 return ret; 285 } 286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 287 if (ret) { 288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 289 return ret; 290 } 291 qp_attr.qp_state = IB_QPS_RTR; 292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 293 if (ret) { 294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 295 return ret; 296 } 297 qp_attr.rq_psn = psn; 298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 299 if (ret) { 300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 301 return ret; 302 } 303 304 /* 305 * Current Mellanox HCA firmware won't generate completions 306 * with error for drain WRs unless the QP has been moved to 307 * RTS first. This work-around leaves a window where a QP has 308 * moved to error asynchronously, but this will eventually get 309 * fixed in firmware, so let's not error out if modify QP 310 * fails. 311 */ 312 qp_attr.qp_state = IB_QPS_RTS; 313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 314 if (ret) { 315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 316 return 0; 317 } 318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 319 if (ret) { 320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 321 return 0; 322 } 323 324 return 0; 325 } 326 327 static void ipoib_cm_init_rx_wr(struct net_device *dev, 328 struct ib_recv_wr *wr, 329 struct ib_sge *sge) 330 { 331 struct ipoib_dev_priv *priv = netdev_priv(dev); 332 int i; 333 334 for (i = 0; i < priv->cm.num_frags; ++i) 335 sge[i].lkey = priv->pd->local_dma_lkey; 336 337 sge[0].length = IPOIB_CM_HEAD_SIZE; 338 for (i = 1; i < priv->cm.num_frags; ++i) 339 sge[i].length = PAGE_SIZE; 340 341 wr->next = NULL; 342 wr->sg_list = sge; 343 wr->num_sge = priv->cm.num_frags; 344 } 345 346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 347 struct ipoib_cm_rx *rx) 348 { 349 struct ipoib_dev_priv *priv = netdev_priv(dev); 350 struct { 351 struct ib_recv_wr wr; 352 struct ib_sge sge[IPOIB_CM_RX_SG]; 353 } *t; 354 int ret; 355 int i; 356 357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 358 if (!rx->rx_ring) { 359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 360 priv->ca->name, ipoib_recvq_size); 361 return -ENOMEM; 362 } 363 364 t = kmalloc(sizeof *t, GFP_KERNEL); 365 if (!t) { 366 ret = -ENOMEM; 367 goto err_free; 368 } 369 370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 371 372 spin_lock_irq(&priv->lock); 373 374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 375 spin_unlock_irq(&priv->lock); 376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 377 ret = -EINVAL; 378 goto err_free; 379 } else 380 ++priv->cm.nonsrq_conn_qp; 381 382 spin_unlock_irq(&priv->lock); 383 384 for (i = 0; i < ipoib_recvq_size; ++i) { 385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 386 rx->rx_ring[i].mapping, 387 GFP_KERNEL)) { 388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 389 ret = -ENOMEM; 390 goto err_count; 391 } 392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 393 if (ret) { 394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 395 "failed for buf %d\n", i); 396 ret = -EIO; 397 goto err_count; 398 } 399 } 400 401 rx->recv_count = ipoib_recvq_size; 402 403 kfree(t); 404 405 return 0; 406 407 err_count: 408 spin_lock_irq(&priv->lock); 409 --priv->cm.nonsrq_conn_qp; 410 spin_unlock_irq(&priv->lock); 411 412 err_free: 413 kfree(t); 414 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 415 416 return ret; 417 } 418 419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 420 struct ib_qp *qp, struct ib_cm_req_event_param *req, 421 unsigned psn) 422 { 423 struct ipoib_dev_priv *priv = netdev_priv(dev); 424 struct ipoib_cm_data data = {}; 425 struct ib_cm_rep_param rep = {}; 426 427 data.qpn = cpu_to_be32(priv->qp->qp_num); 428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 429 430 rep.private_data = &data; 431 rep.private_data_len = sizeof data; 432 rep.flow_control = 0; 433 rep.rnr_retry_count = req->rnr_retry_count; 434 rep.srq = ipoib_cm_has_srq(dev); 435 rep.qp_num = qp->qp_num; 436 rep.starting_psn = psn; 437 return ib_send_cm_rep(cm_id, &rep); 438 } 439 440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 441 { 442 struct net_device *dev = cm_id->context; 443 struct ipoib_dev_priv *priv = netdev_priv(dev); 444 struct ipoib_cm_rx *p; 445 unsigned psn; 446 int ret; 447 448 ipoib_dbg(priv, "REQ arrived\n"); 449 p = kzalloc(sizeof *p, GFP_KERNEL); 450 if (!p) 451 return -ENOMEM; 452 p->dev = dev; 453 p->id = cm_id; 454 cm_id->context = p; 455 p->state = IPOIB_CM_RX_LIVE; 456 p->jiffies = jiffies; 457 INIT_LIST_HEAD(&p->list); 458 459 p->qp = ipoib_cm_create_rx_qp(dev, p); 460 if (IS_ERR(p->qp)) { 461 ret = PTR_ERR(p->qp); 462 goto err_qp; 463 } 464 465 psn = prandom_u32() & 0xffffff; 466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 467 if (ret) 468 goto err_modify; 469 470 if (!ipoib_cm_has_srq(dev)) { 471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 472 if (ret) 473 goto err_modify; 474 } 475 476 spin_lock_irq(&priv->lock); 477 queue_delayed_work(priv->wq, 478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 479 /* Add this entry to passive ids list head, but do not re-add it 480 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 481 p->jiffies = jiffies; 482 if (p->state == IPOIB_CM_RX_LIVE) 483 list_move(&p->list, &priv->cm.passive_ids); 484 spin_unlock_irq(&priv->lock); 485 486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 487 if (ret) { 488 ipoib_warn(priv, "failed to send REP: %d\n", ret); 489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 490 ipoib_warn(priv, "unable to move qp to error state\n"); 491 } 492 return 0; 493 494 err_modify: 495 ib_destroy_qp(p->qp); 496 err_qp: 497 kfree(p); 498 return ret; 499 } 500 501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 502 struct ib_cm_event *event) 503 { 504 struct ipoib_cm_rx *p; 505 struct ipoib_dev_priv *priv; 506 507 switch (event->event) { 508 case IB_CM_REQ_RECEIVED: 509 return ipoib_cm_req_handler(cm_id, event); 510 case IB_CM_DREQ_RECEIVED: 511 p = cm_id->context; 512 ib_send_cm_drep(cm_id, NULL, 0); 513 /* Fall through */ 514 case IB_CM_REJ_RECEIVED: 515 p = cm_id->context; 516 priv = netdev_priv(p->dev); 517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 518 ipoib_warn(priv, "unable to move qp to error state\n"); 519 /* Fall through */ 520 default: 521 return 0; 522 } 523 } 524 /* Adjust length of skb with fragments to match received data */ 525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 526 unsigned int length, struct sk_buff *toskb) 527 { 528 int i, num_frags; 529 unsigned int size; 530 531 /* put header into skb */ 532 size = min(length, hdr_space); 533 skb->tail += size; 534 skb->len += size; 535 length -= size; 536 537 num_frags = skb_shinfo(skb)->nr_frags; 538 for (i = 0; i < num_frags; i++) { 539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 540 541 if (length == 0) { 542 /* don't need this page */ 543 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 544 0, PAGE_SIZE); 545 --skb_shinfo(skb)->nr_frags; 546 } else { 547 size = min(length, (unsigned) PAGE_SIZE); 548 549 skb_frag_size_set(frag, size); 550 skb->data_len += size; 551 skb->truesize += size; 552 skb->len += size; 553 length -= size; 554 } 555 } 556 } 557 558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 559 { 560 struct ipoib_dev_priv *priv = netdev_priv(dev); 561 struct ipoib_cm_rx_buf *rx_ring; 562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 563 struct sk_buff *skb, *newskb; 564 struct ipoib_cm_rx *p; 565 unsigned long flags; 566 u64 mapping[IPOIB_CM_RX_SG]; 567 int frags; 568 int has_srq; 569 struct sk_buff *small_skb; 570 571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 572 wr_id, wc->status); 573 574 if (unlikely(wr_id >= ipoib_recvq_size)) { 575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 576 spin_lock_irqsave(&priv->lock, flags); 577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 578 ipoib_cm_start_rx_drain(priv); 579 queue_work(priv->wq, &priv->cm.rx_reap_task); 580 spin_unlock_irqrestore(&priv->lock, flags); 581 } else 582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 583 wr_id, ipoib_recvq_size); 584 return; 585 } 586 587 p = wc->qp->qp_context; 588 589 has_srq = ipoib_cm_has_srq(dev); 590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 591 592 skb = rx_ring[wr_id].skb; 593 594 if (unlikely(wc->status != IB_WC_SUCCESS)) { 595 ipoib_dbg(priv, "cm recv error " 596 "(status=%d, wrid=%d vend_err %x)\n", 597 wc->status, wr_id, wc->vendor_err); 598 ++dev->stats.rx_dropped; 599 if (has_srq) 600 goto repost; 601 else { 602 if (!--p->recv_count) { 603 spin_lock_irqsave(&priv->lock, flags); 604 list_move(&p->list, &priv->cm.rx_reap_list); 605 spin_unlock_irqrestore(&priv->lock, flags); 606 queue_work(priv->wq, &priv->cm.rx_reap_task); 607 } 608 return; 609 } 610 } 611 612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 614 spin_lock_irqsave(&priv->lock, flags); 615 p->jiffies = jiffies; 616 /* Move this entry to list head, but do not re-add it 617 * if it has been moved out of list. */ 618 if (p->state == IPOIB_CM_RX_LIVE) 619 list_move(&p->list, &priv->cm.passive_ids); 620 spin_unlock_irqrestore(&priv->lock, flags); 621 } 622 } 623 624 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 625 int dlen = wc->byte_len; 626 627 small_skb = dev_alloc_skb(dlen + 12); 628 if (small_skb) { 629 skb_reserve(small_skb, 12); 630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 631 dlen, DMA_FROM_DEVICE); 632 skb_copy_from_linear_data(skb, small_skb->data, dlen); 633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 634 dlen, DMA_FROM_DEVICE); 635 skb_put(small_skb, dlen); 636 skb = small_skb; 637 goto copied; 638 } 639 } 640 641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 643 644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, 645 mapping, GFP_ATOMIC); 646 if (unlikely(!newskb)) { 647 /* 648 * If we can't allocate a new RX buffer, dump 649 * this packet and reuse the old buffer. 650 */ 651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 652 ++dev->stats.rx_dropped; 653 goto repost; 654 } 655 656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 658 659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 660 wc->byte_len, wc->slid); 661 662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 663 664 copied: 665 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 666 skb_reset_mac_header(skb); 667 skb_pull(skb, IPOIB_ENCAP_LEN); 668 669 ++dev->stats.rx_packets; 670 dev->stats.rx_bytes += skb->len; 671 672 skb->dev = dev; 673 /* XXX get correct PACKET_ type here */ 674 skb->pkt_type = PACKET_HOST; 675 netif_receive_skb(skb); 676 677 repost: 678 if (has_srq) { 679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 681 "for buf %d\n", wr_id); 682 } else { 683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 684 &priv->cm.rx_wr, 685 priv->cm.rx_sge, 686 wr_id))) { 687 --p->recv_count; 688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 689 "for buf %d\n", wr_id); 690 } 691 } 692 } 693 694 static inline int post_send(struct ipoib_dev_priv *priv, 695 struct ipoib_cm_tx *tx, 696 unsigned int wr_id, 697 struct ipoib_tx_buf *tx_req) 698 { 699 struct ib_send_wr *bad_wr; 700 701 ipoib_build_sge(priv, tx_req); 702 703 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 704 705 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 706 } 707 708 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 709 { 710 struct ipoib_dev_priv *priv = netdev_priv(dev); 711 struct ipoib_tx_buf *tx_req; 712 int rc; 713 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb); 714 715 if (unlikely(skb->len > tx->mtu)) { 716 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 717 skb->len, tx->mtu); 718 ++dev->stats.tx_dropped; 719 ++dev->stats.tx_errors; 720 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 721 return; 722 } 723 if (skb_shinfo(skb)->nr_frags > usable_sge) { 724 if (skb_linearize(skb) < 0) { 725 ipoib_warn(priv, "skb could not be linearized\n"); 726 ++dev->stats.tx_dropped; 727 ++dev->stats.tx_errors; 728 dev_kfree_skb_any(skb); 729 return; 730 } 731 /* Does skb_linearize return ok without reducing nr_frags? */ 732 if (skb_shinfo(skb)->nr_frags > usable_sge) { 733 ipoib_warn(priv, "too many frags after skb linearize\n"); 734 ++dev->stats.tx_dropped; 735 ++dev->stats.tx_errors; 736 dev_kfree_skb_any(skb); 737 return; 738 } 739 } 740 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 741 tx->tx_head, skb->len, tx->qp->qp_num); 742 743 /* 744 * We put the skb into the tx_ring _before_ we call post_send() 745 * because it's entirely possible that the completion handler will 746 * run before we execute anything after the post_send(). That 747 * means we have to make sure everything is properly recorded and 748 * our state is consistent before we call post_send(). 749 */ 750 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 751 tx_req->skb = skb; 752 753 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 754 ++dev->stats.tx_errors; 755 dev_kfree_skb_any(skb); 756 return; 757 } 758 759 skb_orphan(skb); 760 skb_dst_drop(skb); 761 762 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req); 763 if (unlikely(rc)) { 764 ipoib_warn(priv, "post_send failed, error %d\n", rc); 765 ++dev->stats.tx_errors; 766 ipoib_dma_unmap_tx(priv, tx_req); 767 dev_kfree_skb_any(skb); 768 } else { 769 netif_trans_update(dev); 770 ++tx->tx_head; 771 772 if (++priv->tx_outstanding == ipoib_sendq_size) { 773 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 774 tx->qp->qp_num); 775 netif_stop_queue(dev); 776 rc = ib_req_notify_cq(priv->send_cq, 777 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 778 if (rc < 0) 779 ipoib_warn(priv, "request notify on send CQ failed\n"); 780 else if (rc) 781 ipoib_send_comp_handler(priv->send_cq, dev); 782 } 783 } 784 } 785 786 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 787 { 788 struct ipoib_dev_priv *priv = netdev_priv(dev); 789 struct ipoib_cm_tx *tx = wc->qp->qp_context; 790 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 791 struct ipoib_tx_buf *tx_req; 792 unsigned long flags; 793 794 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 795 wr_id, wc->status); 796 797 if (unlikely(wr_id >= ipoib_sendq_size)) { 798 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 799 wr_id, ipoib_sendq_size); 800 return; 801 } 802 803 tx_req = &tx->tx_ring[wr_id]; 804 805 ipoib_dma_unmap_tx(priv, tx_req); 806 807 /* FIXME: is this right? Shouldn't we only increment on success? */ 808 ++dev->stats.tx_packets; 809 dev->stats.tx_bytes += tx_req->skb->len; 810 811 dev_kfree_skb_any(tx_req->skb); 812 813 netif_tx_lock(dev); 814 815 ++tx->tx_tail; 816 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 817 netif_queue_stopped(dev) && 818 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 819 netif_wake_queue(dev); 820 821 if (wc->status != IB_WC_SUCCESS && 822 wc->status != IB_WC_WR_FLUSH_ERR) { 823 struct ipoib_neigh *neigh; 824 825 ipoib_dbg(priv, "failed cm send event " 826 "(status=%d, wrid=%d vend_err %x)\n", 827 wc->status, wr_id, wc->vendor_err); 828 829 spin_lock_irqsave(&priv->lock, flags); 830 neigh = tx->neigh; 831 832 if (neigh) { 833 neigh->cm = NULL; 834 ipoib_neigh_free(neigh); 835 836 tx->neigh = NULL; 837 } 838 839 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 840 list_move(&tx->list, &priv->cm.reap_list); 841 queue_work(priv->wq, &priv->cm.reap_task); 842 } 843 844 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 845 846 spin_unlock_irqrestore(&priv->lock, flags); 847 } 848 849 netif_tx_unlock(dev); 850 } 851 852 int ipoib_cm_dev_open(struct net_device *dev) 853 { 854 struct ipoib_dev_priv *priv = netdev_priv(dev); 855 int ret; 856 857 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 858 return 0; 859 860 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 861 if (IS_ERR(priv->cm.id)) { 862 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 863 ret = PTR_ERR(priv->cm.id); 864 goto err_cm; 865 } 866 867 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 868 0); 869 if (ret) { 870 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 871 IPOIB_CM_IETF_ID | priv->qp->qp_num); 872 goto err_listen; 873 } 874 875 return 0; 876 877 err_listen: 878 ib_destroy_cm_id(priv->cm.id); 879 err_cm: 880 priv->cm.id = NULL; 881 return ret; 882 } 883 884 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 885 { 886 struct ipoib_dev_priv *priv = netdev_priv(dev); 887 struct ipoib_cm_rx *rx, *n; 888 LIST_HEAD(list); 889 890 spin_lock_irq(&priv->lock); 891 list_splice_init(&priv->cm.rx_reap_list, &list); 892 spin_unlock_irq(&priv->lock); 893 894 list_for_each_entry_safe(rx, n, &list, list) { 895 ib_destroy_cm_id(rx->id); 896 ib_destroy_qp(rx->qp); 897 if (!ipoib_cm_has_srq(dev)) { 898 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 899 spin_lock_irq(&priv->lock); 900 --priv->cm.nonsrq_conn_qp; 901 spin_unlock_irq(&priv->lock); 902 } 903 kfree(rx); 904 } 905 } 906 907 void ipoib_cm_dev_stop(struct net_device *dev) 908 { 909 struct ipoib_dev_priv *priv = netdev_priv(dev); 910 struct ipoib_cm_rx *p; 911 unsigned long begin; 912 int ret; 913 914 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 915 return; 916 917 ib_destroy_cm_id(priv->cm.id); 918 priv->cm.id = NULL; 919 920 spin_lock_irq(&priv->lock); 921 while (!list_empty(&priv->cm.passive_ids)) { 922 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 923 list_move(&p->list, &priv->cm.rx_error_list); 924 p->state = IPOIB_CM_RX_ERROR; 925 spin_unlock_irq(&priv->lock); 926 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 927 if (ret) 928 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 929 spin_lock_irq(&priv->lock); 930 } 931 932 /* Wait for all RX to be drained */ 933 begin = jiffies; 934 935 while (!list_empty(&priv->cm.rx_error_list) || 936 !list_empty(&priv->cm.rx_flush_list) || 937 !list_empty(&priv->cm.rx_drain_list)) { 938 if (time_after(jiffies, begin + 5 * HZ)) { 939 ipoib_warn(priv, "RX drain timing out\n"); 940 941 /* 942 * assume the HW is wedged and just free up everything. 943 */ 944 list_splice_init(&priv->cm.rx_flush_list, 945 &priv->cm.rx_reap_list); 946 list_splice_init(&priv->cm.rx_error_list, 947 &priv->cm.rx_reap_list); 948 list_splice_init(&priv->cm.rx_drain_list, 949 &priv->cm.rx_reap_list); 950 break; 951 } 952 spin_unlock_irq(&priv->lock); 953 msleep(1); 954 ipoib_drain_cq(dev); 955 spin_lock_irq(&priv->lock); 956 } 957 958 spin_unlock_irq(&priv->lock); 959 960 ipoib_cm_free_rx_reap_list(dev); 961 962 cancel_delayed_work(&priv->cm.stale_task); 963 } 964 965 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 966 { 967 struct ipoib_cm_tx *p = cm_id->context; 968 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 969 struct ipoib_cm_data *data = event->private_data; 970 struct sk_buff_head skqueue; 971 struct ib_qp_attr qp_attr; 972 int qp_attr_mask, ret; 973 struct sk_buff *skb; 974 975 p->mtu = be32_to_cpu(data->mtu); 976 977 if (p->mtu <= IPOIB_ENCAP_LEN) { 978 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 979 p->mtu, IPOIB_ENCAP_LEN); 980 return -EINVAL; 981 } 982 983 qp_attr.qp_state = IB_QPS_RTR; 984 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 985 if (ret) { 986 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 987 return ret; 988 } 989 990 qp_attr.rq_psn = 0 /* FIXME */; 991 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 992 if (ret) { 993 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 994 return ret; 995 } 996 997 qp_attr.qp_state = IB_QPS_RTS; 998 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 999 if (ret) { 1000 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 1001 return ret; 1002 } 1003 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 1004 if (ret) { 1005 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 1006 return ret; 1007 } 1008 1009 skb_queue_head_init(&skqueue); 1010 1011 spin_lock_irq(&priv->lock); 1012 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 1013 if (p->neigh) 1014 while ((skb = __skb_dequeue(&p->neigh->queue))) 1015 __skb_queue_tail(&skqueue, skb); 1016 spin_unlock_irq(&priv->lock); 1017 1018 while ((skb = __skb_dequeue(&skqueue))) { 1019 skb->dev = p->dev; 1020 if (dev_queue_xmit(skb)) 1021 ipoib_warn(priv, "dev_queue_xmit failed " 1022 "to requeue packet\n"); 1023 } 1024 1025 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1026 if (ret) { 1027 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1028 return ret; 1029 } 1030 return 0; 1031 } 1032 1033 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1034 { 1035 struct ipoib_dev_priv *priv = netdev_priv(dev); 1036 struct ib_qp_init_attr attr = { 1037 .send_cq = priv->recv_cq, 1038 .recv_cq = priv->recv_cq, 1039 .srq = priv->cm.srq, 1040 .cap.max_send_wr = ipoib_sendq_size, 1041 .cap.max_send_sge = 1, 1042 .sq_sig_type = IB_SIGNAL_ALL_WR, 1043 .qp_type = IB_QPT_RC, 1044 .qp_context = tx, 1045 .create_flags = IB_QP_CREATE_USE_GFP_NOIO 1046 }; 1047 1048 struct ib_qp *tx_qp; 1049 1050 if (dev->features & NETIF_F_SG) 1051 attr.cap.max_send_sge = 1052 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1); 1053 1054 tx_qp = ib_create_qp(priv->pd, &attr); 1055 if (PTR_ERR(tx_qp) == -EINVAL) { 1056 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n", 1057 priv->ca->name); 1058 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO; 1059 tx_qp = ib_create_qp(priv->pd, &attr); 1060 } 1061 tx->max_send_sge = attr.cap.max_send_sge; 1062 return tx_qp; 1063 } 1064 1065 static int ipoib_cm_send_req(struct net_device *dev, 1066 struct ib_cm_id *id, struct ib_qp *qp, 1067 u32 qpn, 1068 struct ib_sa_path_rec *pathrec) 1069 { 1070 struct ipoib_dev_priv *priv = netdev_priv(dev); 1071 struct ipoib_cm_data data = {}; 1072 struct ib_cm_req_param req = {}; 1073 1074 data.qpn = cpu_to_be32(priv->qp->qp_num); 1075 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1076 1077 req.primary_path = pathrec; 1078 req.alternate_path = NULL; 1079 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1080 req.qp_num = qp->qp_num; 1081 req.qp_type = qp->qp_type; 1082 req.private_data = &data; 1083 req.private_data_len = sizeof data; 1084 req.flow_control = 0; 1085 1086 req.starting_psn = 0; /* FIXME */ 1087 1088 /* 1089 * Pick some arbitrary defaults here; we could make these 1090 * module parameters if anyone cared about setting them. 1091 */ 1092 req.responder_resources = 4; 1093 req.remote_cm_response_timeout = 20; 1094 req.local_cm_response_timeout = 20; 1095 req.retry_count = 0; /* RFC draft warns against retries */ 1096 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1097 req.max_cm_retries = 15; 1098 req.srq = ipoib_cm_has_srq(dev); 1099 return ib_send_cm_req(id, &req); 1100 } 1101 1102 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1103 struct ib_cm_id *cm_id, struct ib_qp *qp) 1104 { 1105 struct ipoib_dev_priv *priv = netdev_priv(dev); 1106 struct ib_qp_attr qp_attr; 1107 int qp_attr_mask, ret; 1108 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1109 if (ret) { 1110 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1111 return ret; 1112 } 1113 1114 qp_attr.qp_state = IB_QPS_INIT; 1115 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1116 qp_attr.port_num = priv->port; 1117 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1118 1119 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1120 if (ret) { 1121 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1122 return ret; 1123 } 1124 return 0; 1125 } 1126 1127 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1128 struct ib_sa_path_rec *pathrec) 1129 { 1130 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1131 int ret; 1132 1133 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring, 1134 GFP_NOIO, PAGE_KERNEL); 1135 if (!p->tx_ring) { 1136 ipoib_warn(priv, "failed to allocate tx ring\n"); 1137 ret = -ENOMEM; 1138 goto err_tx; 1139 } 1140 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1141 1142 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1143 if (IS_ERR(p->qp)) { 1144 ret = PTR_ERR(p->qp); 1145 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1146 goto err_qp; 1147 } 1148 1149 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1150 if (IS_ERR(p->id)) { 1151 ret = PTR_ERR(p->id); 1152 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1153 goto err_id; 1154 } 1155 1156 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1157 if (ret) { 1158 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1159 goto err_modify; 1160 } 1161 1162 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1163 if (ret) { 1164 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1165 goto err_send_cm; 1166 } 1167 1168 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1169 p->qp->qp_num, pathrec->dgid.raw, qpn); 1170 1171 return 0; 1172 1173 err_send_cm: 1174 err_modify: 1175 ib_destroy_cm_id(p->id); 1176 err_id: 1177 p->id = NULL; 1178 ib_destroy_qp(p->qp); 1179 err_qp: 1180 p->qp = NULL; 1181 vfree(p->tx_ring); 1182 err_tx: 1183 return ret; 1184 } 1185 1186 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1187 { 1188 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1189 struct ipoib_tx_buf *tx_req; 1190 unsigned long begin; 1191 1192 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1193 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1194 1195 if (p->id) 1196 ib_destroy_cm_id(p->id); 1197 1198 if (p->tx_ring) { 1199 /* Wait for all sends to complete */ 1200 begin = jiffies; 1201 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1202 if (time_after(jiffies, begin + 5 * HZ)) { 1203 ipoib_warn(priv, "timing out; %d sends not completed\n", 1204 p->tx_head - p->tx_tail); 1205 goto timeout; 1206 } 1207 1208 msleep(1); 1209 } 1210 } 1211 1212 timeout: 1213 1214 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1215 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1216 ipoib_dma_unmap_tx(priv, tx_req); 1217 dev_kfree_skb_any(tx_req->skb); 1218 ++p->tx_tail; 1219 netif_tx_lock_bh(p->dev); 1220 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1221 netif_queue_stopped(p->dev) && 1222 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1223 netif_wake_queue(p->dev); 1224 netif_tx_unlock_bh(p->dev); 1225 } 1226 1227 if (p->qp) 1228 ib_destroy_qp(p->qp); 1229 1230 vfree(p->tx_ring); 1231 kfree(p); 1232 } 1233 1234 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1235 struct ib_cm_event *event) 1236 { 1237 struct ipoib_cm_tx *tx = cm_id->context; 1238 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1239 struct net_device *dev = priv->dev; 1240 struct ipoib_neigh *neigh; 1241 unsigned long flags; 1242 int ret; 1243 1244 switch (event->event) { 1245 case IB_CM_DREQ_RECEIVED: 1246 ipoib_dbg(priv, "DREQ received.\n"); 1247 ib_send_cm_drep(cm_id, NULL, 0); 1248 break; 1249 case IB_CM_REP_RECEIVED: 1250 ipoib_dbg(priv, "REP received.\n"); 1251 ret = ipoib_cm_rep_handler(cm_id, event); 1252 if (ret) 1253 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1254 NULL, 0, NULL, 0); 1255 break; 1256 case IB_CM_REQ_ERROR: 1257 case IB_CM_REJ_RECEIVED: 1258 case IB_CM_TIMEWAIT_EXIT: 1259 ipoib_dbg(priv, "CM error %d.\n", event->event); 1260 netif_tx_lock_bh(dev); 1261 spin_lock_irqsave(&priv->lock, flags); 1262 neigh = tx->neigh; 1263 1264 if (neigh) { 1265 neigh->cm = NULL; 1266 ipoib_neigh_free(neigh); 1267 1268 tx->neigh = NULL; 1269 } 1270 1271 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1272 list_move(&tx->list, &priv->cm.reap_list); 1273 queue_work(priv->wq, &priv->cm.reap_task); 1274 } 1275 1276 spin_unlock_irqrestore(&priv->lock, flags); 1277 netif_tx_unlock_bh(dev); 1278 break; 1279 default: 1280 break; 1281 } 1282 1283 return 0; 1284 } 1285 1286 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1287 struct ipoib_neigh *neigh) 1288 { 1289 struct ipoib_dev_priv *priv = netdev_priv(dev); 1290 struct ipoib_cm_tx *tx; 1291 1292 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1293 if (!tx) 1294 return NULL; 1295 1296 neigh->cm = tx; 1297 tx->neigh = neigh; 1298 tx->path = path; 1299 tx->dev = dev; 1300 list_add(&tx->list, &priv->cm.start_list); 1301 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1302 queue_work(priv->wq, &priv->cm.start_task); 1303 return tx; 1304 } 1305 1306 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1307 { 1308 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1309 unsigned long flags; 1310 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1311 spin_lock_irqsave(&priv->lock, flags); 1312 list_move(&tx->list, &priv->cm.reap_list); 1313 queue_work(priv->wq, &priv->cm.reap_task); 1314 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1315 tx->neigh->daddr + 4); 1316 tx->neigh = NULL; 1317 spin_unlock_irqrestore(&priv->lock, flags); 1318 } 1319 } 1320 1321 static void ipoib_cm_tx_start(struct work_struct *work) 1322 { 1323 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1324 cm.start_task); 1325 struct net_device *dev = priv->dev; 1326 struct ipoib_neigh *neigh; 1327 struct ipoib_cm_tx *p; 1328 unsigned long flags; 1329 int ret; 1330 1331 struct ib_sa_path_rec pathrec; 1332 u32 qpn; 1333 1334 netif_tx_lock_bh(dev); 1335 spin_lock_irqsave(&priv->lock, flags); 1336 1337 while (!list_empty(&priv->cm.start_list)) { 1338 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1339 list_del_init(&p->list); 1340 neigh = p->neigh; 1341 qpn = IPOIB_QPN(neigh->daddr); 1342 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1343 1344 spin_unlock_irqrestore(&priv->lock, flags); 1345 netif_tx_unlock_bh(dev); 1346 1347 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1348 1349 netif_tx_lock_bh(dev); 1350 spin_lock_irqsave(&priv->lock, flags); 1351 1352 if (ret) { 1353 neigh = p->neigh; 1354 if (neigh) { 1355 neigh->cm = NULL; 1356 ipoib_neigh_free(neigh); 1357 } 1358 list_del(&p->list); 1359 kfree(p); 1360 } 1361 } 1362 1363 spin_unlock_irqrestore(&priv->lock, flags); 1364 netif_tx_unlock_bh(dev); 1365 } 1366 1367 static void ipoib_cm_tx_reap(struct work_struct *work) 1368 { 1369 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1370 cm.reap_task); 1371 struct net_device *dev = priv->dev; 1372 struct ipoib_cm_tx *p; 1373 unsigned long flags; 1374 1375 netif_tx_lock_bh(dev); 1376 spin_lock_irqsave(&priv->lock, flags); 1377 1378 while (!list_empty(&priv->cm.reap_list)) { 1379 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1380 list_del(&p->list); 1381 spin_unlock_irqrestore(&priv->lock, flags); 1382 netif_tx_unlock_bh(dev); 1383 ipoib_cm_tx_destroy(p); 1384 netif_tx_lock_bh(dev); 1385 spin_lock_irqsave(&priv->lock, flags); 1386 } 1387 1388 spin_unlock_irqrestore(&priv->lock, flags); 1389 netif_tx_unlock_bh(dev); 1390 } 1391 1392 static void ipoib_cm_skb_reap(struct work_struct *work) 1393 { 1394 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1395 cm.skb_task); 1396 struct net_device *dev = priv->dev; 1397 struct sk_buff *skb; 1398 unsigned long flags; 1399 unsigned mtu = priv->mcast_mtu; 1400 1401 netif_tx_lock_bh(dev); 1402 spin_lock_irqsave(&priv->lock, flags); 1403 1404 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1405 spin_unlock_irqrestore(&priv->lock, flags); 1406 netif_tx_unlock_bh(dev); 1407 1408 if (skb->protocol == htons(ETH_P_IP)) 1409 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1410 #if IS_ENABLED(CONFIG_IPV6) 1411 else if (skb->protocol == htons(ETH_P_IPV6)) 1412 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1413 #endif 1414 dev_kfree_skb_any(skb); 1415 1416 netif_tx_lock_bh(dev); 1417 spin_lock_irqsave(&priv->lock, flags); 1418 } 1419 1420 spin_unlock_irqrestore(&priv->lock, flags); 1421 netif_tx_unlock_bh(dev); 1422 } 1423 1424 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1425 unsigned int mtu) 1426 { 1427 struct ipoib_dev_priv *priv = netdev_priv(dev); 1428 int e = skb_queue_empty(&priv->cm.skb_queue); 1429 1430 if (skb_dst(skb)) 1431 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1432 1433 skb_queue_tail(&priv->cm.skb_queue, skb); 1434 if (e) 1435 queue_work(priv->wq, &priv->cm.skb_task); 1436 } 1437 1438 static void ipoib_cm_rx_reap(struct work_struct *work) 1439 { 1440 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1441 cm.rx_reap_task)->dev); 1442 } 1443 1444 static void ipoib_cm_stale_task(struct work_struct *work) 1445 { 1446 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1447 cm.stale_task.work); 1448 struct ipoib_cm_rx *p; 1449 int ret; 1450 1451 spin_lock_irq(&priv->lock); 1452 while (!list_empty(&priv->cm.passive_ids)) { 1453 /* List is sorted by LRU, start from tail, 1454 * stop when we see a recently used entry */ 1455 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1456 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1457 break; 1458 list_move(&p->list, &priv->cm.rx_error_list); 1459 p->state = IPOIB_CM_RX_ERROR; 1460 spin_unlock_irq(&priv->lock); 1461 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1462 if (ret) 1463 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1464 spin_lock_irq(&priv->lock); 1465 } 1466 1467 if (!list_empty(&priv->cm.passive_ids)) 1468 queue_delayed_work(priv->wq, 1469 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1470 spin_unlock_irq(&priv->lock); 1471 } 1472 1473 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1474 char *buf) 1475 { 1476 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1477 1478 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1479 return sprintf(buf, "connected\n"); 1480 else 1481 return sprintf(buf, "datagram\n"); 1482 } 1483 1484 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1485 const char *buf, size_t count) 1486 { 1487 struct net_device *dev = to_net_dev(d); 1488 int ret; 1489 struct ipoib_dev_priv *priv = netdev_priv(dev); 1490 1491 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags)) 1492 return -EPERM; 1493 1494 if (!rtnl_trylock()) 1495 return restart_syscall(); 1496 1497 ret = ipoib_set_mode(dev, buf); 1498 1499 rtnl_unlock(); 1500 1501 if (!ret) 1502 return count; 1503 1504 return ret; 1505 } 1506 1507 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1508 1509 int ipoib_cm_add_mode_attr(struct net_device *dev) 1510 { 1511 return device_create_file(&dev->dev, &dev_attr_mode); 1512 } 1513 1514 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1515 { 1516 struct ipoib_dev_priv *priv = netdev_priv(dev); 1517 struct ib_srq_init_attr srq_init_attr = { 1518 .srq_type = IB_SRQT_BASIC, 1519 .attr = { 1520 .max_wr = ipoib_recvq_size, 1521 .max_sge = max_sge 1522 } 1523 }; 1524 1525 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1526 if (IS_ERR(priv->cm.srq)) { 1527 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1528 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1529 priv->ca->name, PTR_ERR(priv->cm.srq)); 1530 priv->cm.srq = NULL; 1531 return; 1532 } 1533 1534 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1535 if (!priv->cm.srq_ring) { 1536 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1537 priv->ca->name, ipoib_recvq_size); 1538 ib_destroy_srq(priv->cm.srq); 1539 priv->cm.srq = NULL; 1540 return; 1541 } 1542 1543 } 1544 1545 int ipoib_cm_dev_init(struct net_device *dev) 1546 { 1547 struct ipoib_dev_priv *priv = netdev_priv(dev); 1548 int max_srq_sge, i; 1549 1550 INIT_LIST_HEAD(&priv->cm.passive_ids); 1551 INIT_LIST_HEAD(&priv->cm.reap_list); 1552 INIT_LIST_HEAD(&priv->cm.start_list); 1553 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1554 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1555 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1556 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1557 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1558 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1559 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1560 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1561 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1562 1563 skb_queue_head_init(&priv->cm.skb_queue); 1564 1565 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge); 1566 1567 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge); 1568 ipoib_cm_create_srq(dev, max_srq_sge); 1569 if (ipoib_cm_has_srq(dev)) { 1570 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10; 1571 priv->cm.num_frags = max_srq_sge; 1572 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1573 priv->cm.max_cm_mtu, priv->cm.num_frags); 1574 } else { 1575 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1576 priv->cm.num_frags = IPOIB_CM_RX_SG; 1577 } 1578 1579 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1580 1581 if (ipoib_cm_has_srq(dev)) { 1582 for (i = 0; i < ipoib_recvq_size; ++i) { 1583 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1584 priv->cm.num_frags - 1, 1585 priv->cm.srq_ring[i].mapping, 1586 GFP_KERNEL)) { 1587 ipoib_warn(priv, "failed to allocate " 1588 "receive buffer %d\n", i); 1589 ipoib_cm_dev_cleanup(dev); 1590 return -ENOMEM; 1591 } 1592 1593 if (ipoib_cm_post_receive_srq(dev, i)) { 1594 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1595 "failed for buf %d\n", i); 1596 ipoib_cm_dev_cleanup(dev); 1597 return -EIO; 1598 } 1599 } 1600 } 1601 1602 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1603 return 0; 1604 } 1605 1606 void ipoib_cm_dev_cleanup(struct net_device *dev) 1607 { 1608 struct ipoib_dev_priv *priv = netdev_priv(dev); 1609 int ret; 1610 1611 if (!priv->cm.srq) 1612 return; 1613 1614 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1615 1616 ret = ib_destroy_srq(priv->cm.srq); 1617 if (ret) 1618 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1619 1620 priv->cm.srq = NULL; 1621 if (!priv->cm.srq_ring) 1622 return; 1623 1624 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1625 priv->cm.srq_ring = NULL; 1626 } 1627