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 .wr_id = IPOIB_CM_RX_DRAIN_WRID, 74 .opcode = IB_WR_SEND, 75 }; 76 77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 78 struct ib_cm_event *event); 79 80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 81 u64 mapping[IPOIB_CM_RX_SG]) 82 { 83 int i; 84 85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 86 87 for (i = 0; i < frags; ++i) 88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 89 } 90 91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 92 { 93 struct ipoib_dev_priv *priv = netdev_priv(dev); 94 struct ib_recv_wr *bad_wr; 95 int i, ret; 96 97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 98 99 for (i = 0; i < priv->cm.num_frags; ++i) 100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 101 102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 103 if (unlikely(ret)) { 104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 106 priv->cm.srq_ring[id].mapping); 107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 108 priv->cm.srq_ring[id].skb = NULL; 109 } 110 111 return ret; 112 } 113 114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 115 struct ipoib_cm_rx *rx, 116 struct ib_recv_wr *wr, 117 struct ib_sge *sge, int id) 118 { 119 struct ipoib_dev_priv *priv = netdev_priv(dev); 120 struct ib_recv_wr *bad_wr; 121 int i, ret; 122 123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 124 125 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 126 sge[i].addr = rx->rx_ring[id].mapping[i]; 127 128 ret = ib_post_recv(rx->qp, wr, &bad_wr); 129 if (unlikely(ret)) { 130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 132 rx->rx_ring[id].mapping); 133 dev_kfree_skb_any(rx->rx_ring[id].skb); 134 rx->rx_ring[id].skb = NULL; 135 } 136 137 return ret; 138 } 139 140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 141 struct ipoib_cm_rx_buf *rx_ring, 142 int id, int frags, 143 u64 mapping[IPOIB_CM_RX_SG]) 144 { 145 struct ipoib_dev_priv *priv = netdev_priv(dev); 146 struct sk_buff *skb; 147 int i; 148 149 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); 150 if (unlikely(!skb)) 151 return NULL; 152 153 /* 154 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the 155 * IP header to a multiple of 16. 156 */ 157 skb_reserve(skb, 12); 158 159 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 160 DMA_FROM_DEVICE); 161 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 162 dev_kfree_skb_any(skb); 163 return NULL; 164 } 165 166 for (i = 0; i < frags; i++) { 167 struct page *page = alloc_page(GFP_ATOMIC); 168 169 if (!page) 170 goto partial_error; 171 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 172 173 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 174 0, PAGE_SIZE, DMA_FROM_DEVICE); 175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 176 goto partial_error; 177 } 178 179 rx_ring[id].skb = skb; 180 return skb; 181 182 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 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 226 ipoib_warn(priv, "failed to post drain wr\n"); 227 228 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 229 } 230 231 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 232 { 233 struct ipoib_cm_rx *p = ctx; 234 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 235 unsigned long flags; 236 237 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 238 return; 239 240 spin_lock_irqsave(&priv->lock, flags); 241 list_move(&p->list, &priv->cm.rx_flush_list); 242 p->state = IPOIB_CM_RX_FLUSH; 243 ipoib_cm_start_rx_drain(priv); 244 spin_unlock_irqrestore(&priv->lock, flags); 245 } 246 247 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 248 struct ipoib_cm_rx *p) 249 { 250 struct ipoib_dev_priv *priv = netdev_priv(dev); 251 struct ib_qp_init_attr attr = { 252 .event_handler = ipoib_cm_rx_event_handler, 253 .send_cq = priv->recv_cq, /* For drain WR */ 254 .recv_cq = priv->recv_cq, 255 .srq = priv->cm.srq, 256 .cap.max_send_wr = 1, /* For drain WR */ 257 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 258 .sq_sig_type = IB_SIGNAL_ALL_WR, 259 .qp_type = IB_QPT_RC, 260 .qp_context = p, 261 }; 262 263 if (!ipoib_cm_has_srq(dev)) { 264 attr.cap.max_recv_wr = ipoib_recvq_size; 265 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 266 } 267 268 return ib_create_qp(priv->pd, &attr); 269 } 270 271 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 272 struct ib_cm_id *cm_id, struct ib_qp *qp, 273 unsigned psn) 274 { 275 struct ipoib_dev_priv *priv = netdev_priv(dev); 276 struct ib_qp_attr qp_attr; 277 int qp_attr_mask, ret; 278 279 qp_attr.qp_state = IB_QPS_INIT; 280 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 281 if (ret) { 282 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 283 return ret; 284 } 285 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 286 if (ret) { 287 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 288 return ret; 289 } 290 qp_attr.qp_state = IB_QPS_RTR; 291 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 292 if (ret) { 293 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 294 return ret; 295 } 296 qp_attr.rq_psn = psn; 297 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 298 if (ret) { 299 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 300 return ret; 301 } 302 303 /* 304 * Current Mellanox HCA firmware won't generate completions 305 * with error for drain WRs unless the QP has been moved to 306 * RTS first. This work-around leaves a window where a QP has 307 * moved to error asynchronously, but this will eventually get 308 * fixed in firmware, so let's not error out if modify QP 309 * fails. 310 */ 311 qp_attr.qp_state = IB_QPS_RTS; 312 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 313 if (ret) { 314 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 315 return 0; 316 } 317 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 318 if (ret) { 319 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 320 return 0; 321 } 322 323 return 0; 324 } 325 326 static void ipoib_cm_init_rx_wr(struct net_device *dev, 327 struct ib_recv_wr *wr, 328 struct ib_sge *sge) 329 { 330 struct ipoib_dev_priv *priv = netdev_priv(dev); 331 int i; 332 333 for (i = 0; i < priv->cm.num_frags; ++i) 334 sge[i].lkey = priv->mr->lkey; 335 336 sge[0].length = IPOIB_CM_HEAD_SIZE; 337 for (i = 1; i < priv->cm.num_frags; ++i) 338 sge[i].length = PAGE_SIZE; 339 340 wr->next = NULL; 341 wr->sg_list = sge; 342 wr->num_sge = priv->cm.num_frags; 343 } 344 345 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 346 struct ipoib_cm_rx *rx) 347 { 348 struct ipoib_dev_priv *priv = netdev_priv(dev); 349 struct { 350 struct ib_recv_wr wr; 351 struct ib_sge sge[IPOIB_CM_RX_SG]; 352 } *t; 353 int ret; 354 int i; 355 356 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 357 if (!rx->rx_ring) { 358 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n", 359 priv->ca->name, ipoib_recvq_size); 360 return -ENOMEM; 361 } 362 363 t = kmalloc(sizeof *t, GFP_KERNEL); 364 if (!t) { 365 ret = -ENOMEM; 366 goto err_free; 367 } 368 369 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 370 371 spin_lock_irq(&priv->lock); 372 373 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 374 spin_unlock_irq(&priv->lock); 375 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 376 ret = -EINVAL; 377 goto err_free; 378 } else 379 ++priv->cm.nonsrq_conn_qp; 380 381 spin_unlock_irq(&priv->lock); 382 383 for (i = 0; i < ipoib_recvq_size; ++i) { 384 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 385 rx->rx_ring[i].mapping)) { 386 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 387 ret = -ENOMEM; 388 goto err_count; 389 } 390 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 391 if (ret) { 392 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 393 "failed for buf %d\n", i); 394 ret = -EIO; 395 goto err_count; 396 } 397 } 398 399 rx->recv_count = ipoib_recvq_size; 400 401 kfree(t); 402 403 return 0; 404 405 err_count: 406 spin_lock_irq(&priv->lock); 407 --priv->cm.nonsrq_conn_qp; 408 spin_unlock_irq(&priv->lock); 409 410 err_free: 411 kfree(t); 412 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 413 414 return ret; 415 } 416 417 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 418 struct ib_qp *qp, struct ib_cm_req_event_param *req, 419 unsigned psn) 420 { 421 struct ipoib_dev_priv *priv = netdev_priv(dev); 422 struct ipoib_cm_data data = {}; 423 struct ib_cm_rep_param rep = {}; 424 425 data.qpn = cpu_to_be32(priv->qp->qp_num); 426 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 427 428 rep.private_data = &data; 429 rep.private_data_len = sizeof data; 430 rep.flow_control = 0; 431 rep.rnr_retry_count = req->rnr_retry_count; 432 rep.srq = ipoib_cm_has_srq(dev); 433 rep.qp_num = qp->qp_num; 434 rep.starting_psn = psn; 435 return ib_send_cm_rep(cm_id, &rep); 436 } 437 438 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 439 { 440 struct net_device *dev = cm_id->context; 441 struct ipoib_dev_priv *priv = netdev_priv(dev); 442 struct ipoib_cm_rx *p; 443 unsigned psn; 444 int ret; 445 446 ipoib_dbg(priv, "REQ arrived\n"); 447 p = kzalloc(sizeof *p, GFP_KERNEL); 448 if (!p) 449 return -ENOMEM; 450 p->dev = dev; 451 p->id = cm_id; 452 cm_id->context = p; 453 p->state = IPOIB_CM_RX_LIVE; 454 p->jiffies = jiffies; 455 INIT_LIST_HEAD(&p->list); 456 457 p->qp = ipoib_cm_create_rx_qp(dev, p); 458 if (IS_ERR(p->qp)) { 459 ret = PTR_ERR(p->qp); 460 goto err_qp; 461 } 462 463 psn = prandom_u32() & 0xffffff; 464 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 465 if (ret) 466 goto err_modify; 467 468 if (!ipoib_cm_has_srq(dev)) { 469 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 470 if (ret) 471 goto err_modify; 472 } 473 474 spin_lock_irq(&priv->lock); 475 queue_delayed_work(ipoib_workqueue, 476 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 477 /* Add this entry to passive ids list head, but do not re-add it 478 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 479 p->jiffies = jiffies; 480 if (p->state == IPOIB_CM_RX_LIVE) 481 list_move(&p->list, &priv->cm.passive_ids); 482 spin_unlock_irq(&priv->lock); 483 484 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 485 if (ret) { 486 ipoib_warn(priv, "failed to send REP: %d\n", ret); 487 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 488 ipoib_warn(priv, "unable to move qp to error state\n"); 489 } 490 return 0; 491 492 err_modify: 493 ib_destroy_qp(p->qp); 494 err_qp: 495 kfree(p); 496 return ret; 497 } 498 499 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 500 struct ib_cm_event *event) 501 { 502 struct ipoib_cm_rx *p; 503 struct ipoib_dev_priv *priv; 504 505 switch (event->event) { 506 case IB_CM_REQ_RECEIVED: 507 return ipoib_cm_req_handler(cm_id, event); 508 case IB_CM_DREQ_RECEIVED: 509 p = cm_id->context; 510 ib_send_cm_drep(cm_id, NULL, 0); 511 /* Fall through */ 512 case IB_CM_REJ_RECEIVED: 513 p = cm_id->context; 514 priv = netdev_priv(p->dev); 515 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 516 ipoib_warn(priv, "unable to move qp to error state\n"); 517 /* Fall through */ 518 default: 519 return 0; 520 } 521 } 522 /* Adjust length of skb with fragments to match received data */ 523 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 524 unsigned int length, struct sk_buff *toskb) 525 { 526 int i, num_frags; 527 unsigned int size; 528 529 /* put header into skb */ 530 size = min(length, hdr_space); 531 skb->tail += size; 532 skb->len += size; 533 length -= size; 534 535 num_frags = skb_shinfo(skb)->nr_frags; 536 for (i = 0; i < num_frags; i++) { 537 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 538 539 if (length == 0) { 540 /* don't need this page */ 541 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 542 0, PAGE_SIZE); 543 --skb_shinfo(skb)->nr_frags; 544 } else { 545 size = min(length, (unsigned) PAGE_SIZE); 546 547 skb_frag_size_set(frag, size); 548 skb->data_len += size; 549 skb->truesize += size; 550 skb->len += size; 551 length -= size; 552 } 553 } 554 } 555 556 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 557 { 558 struct ipoib_dev_priv *priv = netdev_priv(dev); 559 struct ipoib_cm_rx_buf *rx_ring; 560 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 561 struct sk_buff *skb, *newskb; 562 struct ipoib_cm_rx *p; 563 unsigned long flags; 564 u64 mapping[IPOIB_CM_RX_SG]; 565 int frags; 566 int has_srq; 567 struct sk_buff *small_skb; 568 569 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 570 wr_id, wc->status); 571 572 if (unlikely(wr_id >= ipoib_recvq_size)) { 573 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 574 spin_lock_irqsave(&priv->lock, flags); 575 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 576 ipoib_cm_start_rx_drain(priv); 577 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 578 spin_unlock_irqrestore(&priv->lock, flags); 579 } else 580 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 581 wr_id, ipoib_recvq_size); 582 return; 583 } 584 585 p = wc->qp->qp_context; 586 587 has_srq = ipoib_cm_has_srq(dev); 588 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 589 590 skb = rx_ring[wr_id].skb; 591 592 if (unlikely(wc->status != IB_WC_SUCCESS)) { 593 ipoib_dbg(priv, "cm recv error " 594 "(status=%d, wrid=%d vend_err %x)\n", 595 wc->status, wr_id, wc->vendor_err); 596 ++dev->stats.rx_dropped; 597 if (has_srq) 598 goto repost; 599 else { 600 if (!--p->recv_count) { 601 spin_lock_irqsave(&priv->lock, flags); 602 list_move(&p->list, &priv->cm.rx_reap_list); 603 spin_unlock_irqrestore(&priv->lock, flags); 604 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task); 605 } 606 return; 607 } 608 } 609 610 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 611 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 612 spin_lock_irqsave(&priv->lock, flags); 613 p->jiffies = jiffies; 614 /* Move this entry to list head, but do not re-add it 615 * if it has been moved out of list. */ 616 if (p->state == IPOIB_CM_RX_LIVE) 617 list_move(&p->list, &priv->cm.passive_ids); 618 spin_unlock_irqrestore(&priv->lock, flags); 619 } 620 } 621 622 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 623 int dlen = wc->byte_len; 624 625 small_skb = dev_alloc_skb(dlen + 12); 626 if (small_skb) { 627 skb_reserve(small_skb, 12); 628 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 629 dlen, DMA_FROM_DEVICE); 630 skb_copy_from_linear_data(skb, small_skb->data, dlen); 631 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 632 dlen, DMA_FROM_DEVICE); 633 skb_put(small_skb, dlen); 634 skb = small_skb; 635 goto copied; 636 } 637 } 638 639 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 640 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 641 642 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping); 643 if (unlikely(!newskb)) { 644 /* 645 * If we can't allocate a new RX buffer, dump 646 * this packet and reuse the old buffer. 647 */ 648 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 649 ++dev->stats.rx_dropped; 650 goto repost; 651 } 652 653 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 654 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 655 656 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 657 wc->byte_len, wc->slid); 658 659 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 660 661 copied: 662 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 663 skb_reset_mac_header(skb); 664 skb_pull(skb, IPOIB_ENCAP_LEN); 665 666 ++dev->stats.rx_packets; 667 dev->stats.rx_bytes += skb->len; 668 669 skb->dev = dev; 670 /* XXX get correct PACKET_ type here */ 671 skb->pkt_type = PACKET_HOST; 672 netif_receive_skb(skb); 673 674 repost: 675 if (has_srq) { 676 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 677 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 678 "for buf %d\n", wr_id); 679 } else { 680 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 681 &priv->cm.rx_wr, 682 priv->cm.rx_sge, 683 wr_id))) { 684 --p->recv_count; 685 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 686 "for buf %d\n", wr_id); 687 } 688 } 689 } 690 691 static inline int post_send(struct ipoib_dev_priv *priv, 692 struct ipoib_cm_tx *tx, 693 unsigned int wr_id, 694 u64 addr, int len) 695 { 696 struct ib_send_wr *bad_wr; 697 698 priv->tx_sge[0].addr = addr; 699 priv->tx_sge[0].length = len; 700 701 priv->tx_wr.num_sge = 1; 702 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM; 703 704 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); 705 } 706 707 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 708 { 709 struct ipoib_dev_priv *priv = netdev_priv(dev); 710 struct ipoib_cm_tx_buf *tx_req; 711 u64 addr; 712 int rc; 713 714 if (unlikely(skb->len > tx->mtu)) { 715 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 716 skb->len, tx->mtu); 717 ++dev->stats.tx_dropped; 718 ++dev->stats.tx_errors; 719 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 720 return; 721 } 722 723 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 724 tx->tx_head, skb->len, tx->qp->qp_num); 725 726 /* 727 * We put the skb into the tx_ring _before_ we call post_send() 728 * because it's entirely possible that the completion handler will 729 * run before we execute anything after the post_send(). That 730 * means we have to make sure everything is properly recorded and 731 * our state is consistent before we call post_send(). 732 */ 733 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 734 tx_req->skb = skb; 735 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); 736 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { 737 ++dev->stats.tx_errors; 738 dev_kfree_skb_any(skb); 739 return; 740 } 741 742 tx_req->mapping = addr; 743 744 skb_orphan(skb); 745 skb_dst_drop(skb); 746 747 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), 748 addr, skb->len); 749 if (unlikely(rc)) { 750 ipoib_warn(priv, "post_send failed, error %d\n", rc); 751 ++dev->stats.tx_errors; 752 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); 753 dev_kfree_skb_any(skb); 754 } else { 755 dev->trans_start = jiffies; 756 ++tx->tx_head; 757 758 if (++priv->tx_outstanding == ipoib_sendq_size) { 759 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 760 tx->qp->qp_num); 761 netif_stop_queue(dev); 762 rc = ib_req_notify_cq(priv->send_cq, 763 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 764 if (rc < 0) 765 ipoib_warn(priv, "request notify on send CQ failed\n"); 766 else if (rc) 767 ipoib_send_comp_handler(priv->send_cq, dev); 768 } 769 } 770 } 771 772 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 773 { 774 struct ipoib_dev_priv *priv = netdev_priv(dev); 775 struct ipoib_cm_tx *tx = wc->qp->qp_context; 776 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 777 struct ipoib_cm_tx_buf *tx_req; 778 unsigned long flags; 779 780 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 781 wr_id, wc->status); 782 783 if (unlikely(wr_id >= ipoib_sendq_size)) { 784 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 785 wr_id, ipoib_sendq_size); 786 return; 787 } 788 789 tx_req = &tx->tx_ring[wr_id]; 790 791 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); 792 793 /* FIXME: is this right? Shouldn't we only increment on success? */ 794 ++dev->stats.tx_packets; 795 dev->stats.tx_bytes += tx_req->skb->len; 796 797 dev_kfree_skb_any(tx_req->skb); 798 799 netif_tx_lock(dev); 800 801 ++tx->tx_tail; 802 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 803 netif_queue_stopped(dev) && 804 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 805 netif_wake_queue(dev); 806 807 if (wc->status != IB_WC_SUCCESS && 808 wc->status != IB_WC_WR_FLUSH_ERR) { 809 struct ipoib_neigh *neigh; 810 811 ipoib_dbg(priv, "failed cm send event " 812 "(status=%d, wrid=%d vend_err %x)\n", 813 wc->status, wr_id, wc->vendor_err); 814 815 spin_lock_irqsave(&priv->lock, flags); 816 neigh = tx->neigh; 817 818 if (neigh) { 819 neigh->cm = NULL; 820 ipoib_neigh_free(neigh); 821 822 tx->neigh = NULL; 823 } 824 825 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 826 list_move(&tx->list, &priv->cm.reap_list); 827 queue_work(ipoib_workqueue, &priv->cm.reap_task); 828 } 829 830 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 831 832 spin_unlock_irqrestore(&priv->lock, flags); 833 } 834 835 netif_tx_unlock(dev); 836 } 837 838 int ipoib_cm_dev_open(struct net_device *dev) 839 { 840 struct ipoib_dev_priv *priv = netdev_priv(dev); 841 int ret; 842 843 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 844 return 0; 845 846 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 847 if (IS_ERR(priv->cm.id)) { 848 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 849 ret = PTR_ERR(priv->cm.id); 850 goto err_cm; 851 } 852 853 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 854 0, NULL); 855 if (ret) { 856 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 857 IPOIB_CM_IETF_ID | priv->qp->qp_num); 858 goto err_listen; 859 } 860 861 return 0; 862 863 err_listen: 864 ib_destroy_cm_id(priv->cm.id); 865 err_cm: 866 priv->cm.id = NULL; 867 return ret; 868 } 869 870 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 871 { 872 struct ipoib_dev_priv *priv = netdev_priv(dev); 873 struct ipoib_cm_rx *rx, *n; 874 LIST_HEAD(list); 875 876 spin_lock_irq(&priv->lock); 877 list_splice_init(&priv->cm.rx_reap_list, &list); 878 spin_unlock_irq(&priv->lock); 879 880 list_for_each_entry_safe(rx, n, &list, list) { 881 ib_destroy_cm_id(rx->id); 882 ib_destroy_qp(rx->qp); 883 if (!ipoib_cm_has_srq(dev)) { 884 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 885 spin_lock_irq(&priv->lock); 886 --priv->cm.nonsrq_conn_qp; 887 spin_unlock_irq(&priv->lock); 888 } 889 kfree(rx); 890 } 891 } 892 893 void ipoib_cm_dev_stop(struct net_device *dev) 894 { 895 struct ipoib_dev_priv *priv = netdev_priv(dev); 896 struct ipoib_cm_rx *p; 897 unsigned long begin; 898 int ret; 899 900 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 901 return; 902 903 ib_destroy_cm_id(priv->cm.id); 904 priv->cm.id = NULL; 905 906 spin_lock_irq(&priv->lock); 907 while (!list_empty(&priv->cm.passive_ids)) { 908 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 909 list_move(&p->list, &priv->cm.rx_error_list); 910 p->state = IPOIB_CM_RX_ERROR; 911 spin_unlock_irq(&priv->lock); 912 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 913 if (ret) 914 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 915 spin_lock_irq(&priv->lock); 916 } 917 918 /* Wait for all RX to be drained */ 919 begin = jiffies; 920 921 while (!list_empty(&priv->cm.rx_error_list) || 922 !list_empty(&priv->cm.rx_flush_list) || 923 !list_empty(&priv->cm.rx_drain_list)) { 924 if (time_after(jiffies, begin + 5 * HZ)) { 925 ipoib_warn(priv, "RX drain timing out\n"); 926 927 /* 928 * assume the HW is wedged and just free up everything. 929 */ 930 list_splice_init(&priv->cm.rx_flush_list, 931 &priv->cm.rx_reap_list); 932 list_splice_init(&priv->cm.rx_error_list, 933 &priv->cm.rx_reap_list); 934 list_splice_init(&priv->cm.rx_drain_list, 935 &priv->cm.rx_reap_list); 936 break; 937 } 938 spin_unlock_irq(&priv->lock); 939 msleep(1); 940 ipoib_drain_cq(dev); 941 spin_lock_irq(&priv->lock); 942 } 943 944 spin_unlock_irq(&priv->lock); 945 946 ipoib_cm_free_rx_reap_list(dev); 947 948 cancel_delayed_work(&priv->cm.stale_task); 949 } 950 951 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 952 { 953 struct ipoib_cm_tx *p = cm_id->context; 954 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 955 struct ipoib_cm_data *data = event->private_data; 956 struct sk_buff_head skqueue; 957 struct ib_qp_attr qp_attr; 958 int qp_attr_mask, ret; 959 struct sk_buff *skb; 960 961 p->mtu = be32_to_cpu(data->mtu); 962 963 if (p->mtu <= IPOIB_ENCAP_LEN) { 964 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 965 p->mtu, IPOIB_ENCAP_LEN); 966 return -EINVAL; 967 } 968 969 qp_attr.qp_state = IB_QPS_RTR; 970 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 971 if (ret) { 972 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 973 return ret; 974 } 975 976 qp_attr.rq_psn = 0 /* FIXME */; 977 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 978 if (ret) { 979 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 980 return ret; 981 } 982 983 qp_attr.qp_state = IB_QPS_RTS; 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 RTS: %d\n", ret); 987 return ret; 988 } 989 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 990 if (ret) { 991 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 992 return ret; 993 } 994 995 skb_queue_head_init(&skqueue); 996 997 spin_lock_irq(&priv->lock); 998 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 999 if (p->neigh) 1000 while ((skb = __skb_dequeue(&p->neigh->queue))) 1001 __skb_queue_tail(&skqueue, skb); 1002 spin_unlock_irq(&priv->lock); 1003 1004 while ((skb = __skb_dequeue(&skqueue))) { 1005 skb->dev = p->dev; 1006 if (dev_queue_xmit(skb)) 1007 ipoib_warn(priv, "dev_queue_xmit failed " 1008 "to requeue packet\n"); 1009 } 1010 1011 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1012 if (ret) { 1013 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1014 return ret; 1015 } 1016 return 0; 1017 } 1018 1019 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1020 { 1021 struct ipoib_dev_priv *priv = netdev_priv(dev); 1022 struct ib_qp_init_attr attr = { 1023 .send_cq = priv->recv_cq, 1024 .recv_cq = priv->recv_cq, 1025 .srq = priv->cm.srq, 1026 .cap.max_send_wr = ipoib_sendq_size, 1027 .cap.max_send_sge = 1, 1028 .sq_sig_type = IB_SIGNAL_ALL_WR, 1029 .qp_type = IB_QPT_RC, 1030 .qp_context = tx 1031 }; 1032 1033 return ib_create_qp(priv->pd, &attr); 1034 } 1035 1036 static int ipoib_cm_send_req(struct net_device *dev, 1037 struct ib_cm_id *id, struct ib_qp *qp, 1038 u32 qpn, 1039 struct ib_sa_path_rec *pathrec) 1040 { 1041 struct ipoib_dev_priv *priv = netdev_priv(dev); 1042 struct ipoib_cm_data data = {}; 1043 struct ib_cm_req_param req = {}; 1044 1045 data.qpn = cpu_to_be32(priv->qp->qp_num); 1046 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1047 1048 req.primary_path = pathrec; 1049 req.alternate_path = NULL; 1050 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1051 req.qp_num = qp->qp_num; 1052 req.qp_type = qp->qp_type; 1053 req.private_data = &data; 1054 req.private_data_len = sizeof data; 1055 req.flow_control = 0; 1056 1057 req.starting_psn = 0; /* FIXME */ 1058 1059 /* 1060 * Pick some arbitrary defaults here; we could make these 1061 * module parameters if anyone cared about setting them. 1062 */ 1063 req.responder_resources = 4; 1064 req.remote_cm_response_timeout = 20; 1065 req.local_cm_response_timeout = 20; 1066 req.retry_count = 0; /* RFC draft warns against retries */ 1067 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1068 req.max_cm_retries = 15; 1069 req.srq = ipoib_cm_has_srq(dev); 1070 return ib_send_cm_req(id, &req); 1071 } 1072 1073 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1074 struct ib_cm_id *cm_id, struct ib_qp *qp) 1075 { 1076 struct ipoib_dev_priv *priv = netdev_priv(dev); 1077 struct ib_qp_attr qp_attr; 1078 int qp_attr_mask, ret; 1079 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1080 if (ret) { 1081 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1082 return ret; 1083 } 1084 1085 qp_attr.qp_state = IB_QPS_INIT; 1086 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1087 qp_attr.port_num = priv->port; 1088 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1089 1090 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1091 if (ret) { 1092 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1093 return ret; 1094 } 1095 return 0; 1096 } 1097 1098 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1099 struct ib_sa_path_rec *pathrec) 1100 { 1101 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1102 int ret; 1103 1104 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring); 1105 if (!p->tx_ring) { 1106 ipoib_warn(priv, "failed to allocate tx ring\n"); 1107 ret = -ENOMEM; 1108 goto err_tx; 1109 } 1110 1111 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1112 if (IS_ERR(p->qp)) { 1113 ret = PTR_ERR(p->qp); 1114 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); 1115 goto err_qp; 1116 } 1117 1118 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1119 if (IS_ERR(p->id)) { 1120 ret = PTR_ERR(p->id); 1121 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1122 goto err_id; 1123 } 1124 1125 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1126 if (ret) { 1127 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1128 goto err_modify; 1129 } 1130 1131 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1132 if (ret) { 1133 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1134 goto err_send_cm; 1135 } 1136 1137 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1138 p->qp->qp_num, pathrec->dgid.raw, qpn); 1139 1140 return 0; 1141 1142 err_send_cm: 1143 err_modify: 1144 ib_destroy_cm_id(p->id); 1145 err_id: 1146 p->id = NULL; 1147 ib_destroy_qp(p->qp); 1148 err_qp: 1149 p->qp = NULL; 1150 vfree(p->tx_ring); 1151 err_tx: 1152 return ret; 1153 } 1154 1155 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1156 { 1157 struct ipoib_dev_priv *priv = netdev_priv(p->dev); 1158 struct ipoib_cm_tx_buf *tx_req; 1159 unsigned long begin; 1160 1161 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1162 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1163 1164 if (p->id) 1165 ib_destroy_cm_id(p->id); 1166 1167 if (p->tx_ring) { 1168 /* Wait for all sends to complete */ 1169 begin = jiffies; 1170 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1171 if (time_after(jiffies, begin + 5 * HZ)) { 1172 ipoib_warn(priv, "timing out; %d sends not completed\n", 1173 p->tx_head - p->tx_tail); 1174 goto timeout; 1175 } 1176 1177 msleep(1); 1178 } 1179 } 1180 1181 timeout: 1182 1183 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1184 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1185 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, 1186 DMA_TO_DEVICE); 1187 dev_kfree_skb_any(tx_req->skb); 1188 ++p->tx_tail; 1189 netif_tx_lock_bh(p->dev); 1190 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1191 netif_queue_stopped(p->dev) && 1192 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1193 netif_wake_queue(p->dev); 1194 netif_tx_unlock_bh(p->dev); 1195 } 1196 1197 if (p->qp) 1198 ib_destroy_qp(p->qp); 1199 1200 vfree(p->tx_ring); 1201 kfree(p); 1202 } 1203 1204 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1205 struct ib_cm_event *event) 1206 { 1207 struct ipoib_cm_tx *tx = cm_id->context; 1208 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1209 struct net_device *dev = priv->dev; 1210 struct ipoib_neigh *neigh; 1211 unsigned long flags; 1212 int ret; 1213 1214 switch (event->event) { 1215 case IB_CM_DREQ_RECEIVED: 1216 ipoib_dbg(priv, "DREQ received.\n"); 1217 ib_send_cm_drep(cm_id, NULL, 0); 1218 break; 1219 case IB_CM_REP_RECEIVED: 1220 ipoib_dbg(priv, "REP received.\n"); 1221 ret = ipoib_cm_rep_handler(cm_id, event); 1222 if (ret) 1223 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1224 NULL, 0, NULL, 0); 1225 break; 1226 case IB_CM_REQ_ERROR: 1227 case IB_CM_REJ_RECEIVED: 1228 case IB_CM_TIMEWAIT_EXIT: 1229 ipoib_dbg(priv, "CM error %d.\n", event->event); 1230 netif_tx_lock_bh(dev); 1231 spin_lock_irqsave(&priv->lock, flags); 1232 neigh = tx->neigh; 1233 1234 if (neigh) { 1235 neigh->cm = NULL; 1236 ipoib_neigh_free(neigh); 1237 1238 tx->neigh = NULL; 1239 } 1240 1241 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1242 list_move(&tx->list, &priv->cm.reap_list); 1243 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1244 } 1245 1246 spin_unlock_irqrestore(&priv->lock, flags); 1247 netif_tx_unlock_bh(dev); 1248 break; 1249 default: 1250 break; 1251 } 1252 1253 return 0; 1254 } 1255 1256 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1257 struct ipoib_neigh *neigh) 1258 { 1259 struct ipoib_dev_priv *priv = netdev_priv(dev); 1260 struct ipoib_cm_tx *tx; 1261 1262 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1263 if (!tx) 1264 return NULL; 1265 1266 neigh->cm = tx; 1267 tx->neigh = neigh; 1268 tx->path = path; 1269 tx->dev = dev; 1270 list_add(&tx->list, &priv->cm.start_list); 1271 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1272 queue_work(ipoib_workqueue, &priv->cm.start_task); 1273 return tx; 1274 } 1275 1276 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1277 { 1278 struct ipoib_dev_priv *priv = netdev_priv(tx->dev); 1279 unsigned long flags; 1280 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1281 spin_lock_irqsave(&priv->lock, flags); 1282 list_move(&tx->list, &priv->cm.reap_list); 1283 queue_work(ipoib_workqueue, &priv->cm.reap_task); 1284 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1285 tx->neigh->daddr + 4); 1286 tx->neigh = NULL; 1287 spin_unlock_irqrestore(&priv->lock, flags); 1288 } 1289 } 1290 1291 static void ipoib_cm_tx_start(struct work_struct *work) 1292 { 1293 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1294 cm.start_task); 1295 struct net_device *dev = priv->dev; 1296 struct ipoib_neigh *neigh; 1297 struct ipoib_cm_tx *p; 1298 unsigned long flags; 1299 int ret; 1300 1301 struct ib_sa_path_rec pathrec; 1302 u32 qpn; 1303 1304 netif_tx_lock_bh(dev); 1305 spin_lock_irqsave(&priv->lock, flags); 1306 1307 while (!list_empty(&priv->cm.start_list)) { 1308 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1309 list_del_init(&p->list); 1310 neigh = p->neigh; 1311 qpn = IPOIB_QPN(neigh->daddr); 1312 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1313 1314 spin_unlock_irqrestore(&priv->lock, flags); 1315 netif_tx_unlock_bh(dev); 1316 1317 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1318 1319 netif_tx_lock_bh(dev); 1320 spin_lock_irqsave(&priv->lock, flags); 1321 1322 if (ret) { 1323 neigh = p->neigh; 1324 if (neigh) { 1325 neigh->cm = NULL; 1326 ipoib_neigh_free(neigh); 1327 } 1328 list_del(&p->list); 1329 kfree(p); 1330 } 1331 } 1332 1333 spin_unlock_irqrestore(&priv->lock, flags); 1334 netif_tx_unlock_bh(dev); 1335 } 1336 1337 static void ipoib_cm_tx_reap(struct work_struct *work) 1338 { 1339 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1340 cm.reap_task); 1341 struct net_device *dev = priv->dev; 1342 struct ipoib_cm_tx *p; 1343 unsigned long flags; 1344 1345 netif_tx_lock_bh(dev); 1346 spin_lock_irqsave(&priv->lock, flags); 1347 1348 while (!list_empty(&priv->cm.reap_list)) { 1349 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1350 list_del(&p->list); 1351 spin_unlock_irqrestore(&priv->lock, flags); 1352 netif_tx_unlock_bh(dev); 1353 ipoib_cm_tx_destroy(p); 1354 netif_tx_lock_bh(dev); 1355 spin_lock_irqsave(&priv->lock, flags); 1356 } 1357 1358 spin_unlock_irqrestore(&priv->lock, flags); 1359 netif_tx_unlock_bh(dev); 1360 } 1361 1362 static void ipoib_cm_skb_reap(struct work_struct *work) 1363 { 1364 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1365 cm.skb_task); 1366 struct net_device *dev = priv->dev; 1367 struct sk_buff *skb; 1368 unsigned long flags; 1369 unsigned mtu = priv->mcast_mtu; 1370 1371 netif_tx_lock_bh(dev); 1372 spin_lock_irqsave(&priv->lock, flags); 1373 1374 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1375 spin_unlock_irqrestore(&priv->lock, flags); 1376 netif_tx_unlock_bh(dev); 1377 1378 if (skb->protocol == htons(ETH_P_IP)) 1379 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1380 #if IS_ENABLED(CONFIG_IPV6) 1381 else if (skb->protocol == htons(ETH_P_IPV6)) 1382 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1383 #endif 1384 dev_kfree_skb_any(skb); 1385 1386 netif_tx_lock_bh(dev); 1387 spin_lock_irqsave(&priv->lock, flags); 1388 } 1389 1390 spin_unlock_irqrestore(&priv->lock, flags); 1391 netif_tx_unlock_bh(dev); 1392 } 1393 1394 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1395 unsigned int mtu) 1396 { 1397 struct ipoib_dev_priv *priv = netdev_priv(dev); 1398 int e = skb_queue_empty(&priv->cm.skb_queue); 1399 1400 if (skb_dst(skb)) 1401 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1402 1403 skb_queue_tail(&priv->cm.skb_queue, skb); 1404 if (e) 1405 queue_work(ipoib_workqueue, &priv->cm.skb_task); 1406 } 1407 1408 static void ipoib_cm_rx_reap(struct work_struct *work) 1409 { 1410 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1411 cm.rx_reap_task)->dev); 1412 } 1413 1414 static void ipoib_cm_stale_task(struct work_struct *work) 1415 { 1416 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1417 cm.stale_task.work); 1418 struct ipoib_cm_rx *p; 1419 int ret; 1420 1421 spin_lock_irq(&priv->lock); 1422 while (!list_empty(&priv->cm.passive_ids)) { 1423 /* List is sorted by LRU, start from tail, 1424 * stop when we see a recently used entry */ 1425 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1426 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1427 break; 1428 list_move(&p->list, &priv->cm.rx_error_list); 1429 p->state = IPOIB_CM_RX_ERROR; 1430 spin_unlock_irq(&priv->lock); 1431 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1432 if (ret) 1433 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1434 spin_lock_irq(&priv->lock); 1435 } 1436 1437 if (!list_empty(&priv->cm.passive_ids)) 1438 queue_delayed_work(ipoib_workqueue, 1439 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1440 spin_unlock_irq(&priv->lock); 1441 } 1442 1443 1444 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1445 char *buf) 1446 { 1447 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); 1448 1449 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1450 return sprintf(buf, "connected\n"); 1451 else 1452 return sprintf(buf, "datagram\n"); 1453 } 1454 1455 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1456 const char *buf, size_t count) 1457 { 1458 struct net_device *dev = to_net_dev(d); 1459 int ret; 1460 1461 if (!rtnl_trylock()) 1462 return restart_syscall(); 1463 1464 ret = ipoib_set_mode(dev, buf); 1465 1466 rtnl_unlock(); 1467 1468 if (!ret) 1469 return count; 1470 1471 return ret; 1472 } 1473 1474 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1475 1476 int ipoib_cm_add_mode_attr(struct net_device *dev) 1477 { 1478 return device_create_file(&dev->dev, &dev_attr_mode); 1479 } 1480 1481 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1482 { 1483 struct ipoib_dev_priv *priv = netdev_priv(dev); 1484 struct ib_srq_init_attr srq_init_attr = { 1485 .srq_type = IB_SRQT_BASIC, 1486 .attr = { 1487 .max_wr = ipoib_recvq_size, 1488 .max_sge = max_sge 1489 } 1490 }; 1491 1492 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1493 if (IS_ERR(priv->cm.srq)) { 1494 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1495 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1496 priv->ca->name, PTR_ERR(priv->cm.srq)); 1497 priv->cm.srq = NULL; 1498 return; 1499 } 1500 1501 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1502 if (!priv->cm.srq_ring) { 1503 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n", 1504 priv->ca->name, ipoib_recvq_size); 1505 ib_destroy_srq(priv->cm.srq); 1506 priv->cm.srq = NULL; 1507 return; 1508 } 1509 1510 } 1511 1512 int ipoib_cm_dev_init(struct net_device *dev) 1513 { 1514 struct ipoib_dev_priv *priv = netdev_priv(dev); 1515 int i, ret; 1516 struct ib_device_attr attr; 1517 1518 INIT_LIST_HEAD(&priv->cm.passive_ids); 1519 INIT_LIST_HEAD(&priv->cm.reap_list); 1520 INIT_LIST_HEAD(&priv->cm.start_list); 1521 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1522 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1523 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1524 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1525 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1526 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1527 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1528 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1529 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1530 1531 skb_queue_head_init(&priv->cm.skb_queue); 1532 1533 ret = ib_query_device(priv->ca, &attr); 1534 if (ret) { 1535 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret); 1536 return ret; 1537 } 1538 1539 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge); 1540 1541 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge); 1542 ipoib_cm_create_srq(dev, attr.max_srq_sge); 1543 if (ipoib_cm_has_srq(dev)) { 1544 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10; 1545 priv->cm.num_frags = attr.max_srq_sge; 1546 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1547 priv->cm.max_cm_mtu, priv->cm.num_frags); 1548 } else { 1549 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1550 priv->cm.num_frags = IPOIB_CM_RX_SG; 1551 } 1552 1553 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1554 1555 if (ipoib_cm_has_srq(dev)) { 1556 for (i = 0; i < ipoib_recvq_size; ++i) { 1557 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1558 priv->cm.num_frags - 1, 1559 priv->cm.srq_ring[i].mapping)) { 1560 ipoib_warn(priv, "failed to allocate " 1561 "receive buffer %d\n", i); 1562 ipoib_cm_dev_cleanup(dev); 1563 return -ENOMEM; 1564 } 1565 1566 if (ipoib_cm_post_receive_srq(dev, i)) { 1567 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1568 "failed for buf %d\n", i); 1569 ipoib_cm_dev_cleanup(dev); 1570 return -EIO; 1571 } 1572 } 1573 } 1574 1575 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1576 return 0; 1577 } 1578 1579 void ipoib_cm_dev_cleanup(struct net_device *dev) 1580 { 1581 struct ipoib_dev_priv *priv = netdev_priv(dev); 1582 int ret; 1583 1584 if (!priv->cm.srq) 1585 return; 1586 1587 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1588 1589 ret = ib_destroy_srq(priv->cm.srq); 1590 if (ret) 1591 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1592 1593 priv->cm.srq = NULL; 1594 if (!priv->cm.srq_ring) 1595 return; 1596 1597 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1598 priv->cm.srq_ring = NULL; 1599 } 1600