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 #include <linux/sched/signal.h> 42 #include <linux/sched/mm.h> 43 44 #include "ipoib.h" 45 46 int ipoib_max_conn_qp = 128; 47 48 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444); 49 MODULE_PARM_DESC(max_nonsrq_conn_qp, 50 "Max number of connected-mode QPs per interface " 51 "(applied only if shared receive queue is not available)"); 52 53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA 54 static int data_debug_level; 55 56 module_param_named(cm_data_debug_level, data_debug_level, int, 0644); 57 MODULE_PARM_DESC(cm_data_debug_level, 58 "Enable data path debug tracing for connected mode if > 0"); 59 #endif 60 61 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL 62 63 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) 64 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) 65 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) 66 #define IPOIB_CM_RX_UPDATE_MASK (0x3) 67 68 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN) 69 70 static struct ib_qp_attr ipoib_cm_err_attr = { 71 .qp_state = IB_QPS_ERR 72 }; 73 74 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff 75 76 static struct ib_send_wr ipoib_cm_rx_drain_wr = { 77 .opcode = IB_WR_SEND, 78 }; 79 80 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 81 struct ib_cm_event *event); 82 83 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, 84 u64 mapping[IPOIB_CM_RX_SG]) 85 { 86 int i; 87 88 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 89 90 for (i = 0; i < frags; ++i) 91 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); 92 } 93 94 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id) 95 { 96 struct ipoib_dev_priv *priv = ipoib_priv(dev); 97 struct ib_recv_wr *bad_wr; 98 int i, ret; 99 100 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 101 102 for (i = 0; i < priv->cm.num_frags; ++i) 103 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; 104 105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); 106 if (unlikely(ret)) { 107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); 108 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1, 109 priv->cm.srq_ring[id].mapping); 110 dev_kfree_skb_any(priv->cm.srq_ring[id].skb); 111 priv->cm.srq_ring[id].skb = NULL; 112 } 113 114 return ret; 115 } 116 117 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev, 118 struct ipoib_cm_rx *rx, 119 struct ib_recv_wr *wr, 120 struct ib_sge *sge, int id) 121 { 122 struct ipoib_dev_priv *priv = ipoib_priv(dev); 123 struct ib_recv_wr *bad_wr; 124 int i, ret; 125 126 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV; 127 128 for (i = 0; i < IPOIB_CM_RX_SG; ++i) 129 sge[i].addr = rx->rx_ring[id].mapping[i]; 130 131 ret = ib_post_recv(rx->qp, wr, &bad_wr); 132 if (unlikely(ret)) { 133 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret); 134 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 135 rx->rx_ring[id].mapping); 136 dev_kfree_skb_any(rx->rx_ring[id].skb); 137 rx->rx_ring[id].skb = NULL; 138 } 139 140 return ret; 141 } 142 143 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, 144 struct ipoib_cm_rx_buf *rx_ring, 145 int id, int frags, 146 u64 mapping[IPOIB_CM_RX_SG], 147 gfp_t gfp) 148 { 149 struct ipoib_dev_priv *priv = ipoib_priv(dev); 150 struct sk_buff *skb; 151 int i; 152 153 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16)); 154 if (unlikely(!skb)) 155 return NULL; 156 157 /* 158 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the 159 * IP header to a multiple of 16. 160 */ 161 skb_reserve(skb, IPOIB_CM_RX_RESERVE); 162 163 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, 164 DMA_FROM_DEVICE); 165 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { 166 dev_kfree_skb_any(skb); 167 return NULL; 168 } 169 170 for (i = 0; i < frags; i++) { 171 struct page *page = alloc_page(gfp); 172 173 if (!page) 174 goto partial_error; 175 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); 176 177 mapping[i + 1] = ib_dma_map_page(priv->ca, page, 178 0, PAGE_SIZE, DMA_FROM_DEVICE); 179 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) 180 goto partial_error; 181 } 182 183 rx_ring[id].skb = skb; 184 return skb; 185 186 partial_error: 187 188 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); 189 190 for (; i > 0; --i) 191 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE); 192 193 dev_kfree_skb_any(skb); 194 return NULL; 195 } 196 197 static void ipoib_cm_free_rx_ring(struct net_device *dev, 198 struct ipoib_cm_rx_buf *rx_ring) 199 { 200 struct ipoib_dev_priv *priv = ipoib_priv(dev); 201 int i; 202 203 for (i = 0; i < ipoib_recvq_size; ++i) 204 if (rx_ring[i].skb) { 205 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, 206 rx_ring[i].mapping); 207 dev_kfree_skb_any(rx_ring[i].skb); 208 } 209 210 vfree(rx_ring); 211 } 212 213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv) 214 { 215 struct ib_send_wr *bad_wr; 216 struct ipoib_cm_rx *p; 217 218 /* We only reserved 1 extra slot in CQ for drain WRs, so 219 * make sure we have at most 1 outstanding WR. */ 220 if (list_empty(&priv->cm.rx_flush_list) || 221 !list_empty(&priv->cm.rx_drain_list)) 222 return; 223 224 /* 225 * QPs on flush list are error state. This way, a "flush 226 * error" WC will be immediately generated for each WR we post. 227 */ 228 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list); 229 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID; 230 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr)) 231 ipoib_warn(priv, "failed to post drain wr\n"); 232 233 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list); 234 } 235 236 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx) 237 { 238 struct ipoib_cm_rx *p = ctx; 239 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 240 unsigned long flags; 241 242 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED) 243 return; 244 245 spin_lock_irqsave(&priv->lock, flags); 246 list_move(&p->list, &priv->cm.rx_flush_list); 247 p->state = IPOIB_CM_RX_FLUSH; 248 ipoib_cm_start_rx_drain(priv); 249 spin_unlock_irqrestore(&priv->lock, flags); 250 } 251 252 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, 253 struct ipoib_cm_rx *p) 254 { 255 struct ipoib_dev_priv *priv = ipoib_priv(dev); 256 struct ib_qp_init_attr attr = { 257 .event_handler = ipoib_cm_rx_event_handler, 258 .send_cq = priv->recv_cq, /* For drain WR */ 259 .recv_cq = priv->recv_cq, 260 .srq = priv->cm.srq, 261 .cap.max_send_wr = 1, /* For drain WR */ 262 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ 263 .sq_sig_type = IB_SIGNAL_ALL_WR, 264 .qp_type = IB_QPT_RC, 265 .qp_context = p, 266 }; 267 268 if (!ipoib_cm_has_srq(dev)) { 269 attr.cap.max_recv_wr = ipoib_recvq_size; 270 attr.cap.max_recv_sge = IPOIB_CM_RX_SG; 271 } 272 273 return ib_create_qp(priv->pd, &attr); 274 } 275 276 static int ipoib_cm_modify_rx_qp(struct net_device *dev, 277 struct ib_cm_id *cm_id, struct ib_qp *qp, 278 unsigned psn) 279 { 280 struct ipoib_dev_priv *priv = ipoib_priv(dev); 281 struct ib_qp_attr qp_attr; 282 int qp_attr_mask, ret; 283 284 qp_attr.qp_state = IB_QPS_INIT; 285 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 286 if (ret) { 287 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); 288 return ret; 289 } 290 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 291 if (ret) { 292 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); 293 return ret; 294 } 295 qp_attr.qp_state = IB_QPS_RTR; 296 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 297 if (ret) { 298 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 299 return ret; 300 } 301 qp_attr.rq_psn = psn; 302 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 303 if (ret) { 304 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 305 return ret; 306 } 307 308 /* 309 * Current Mellanox HCA firmware won't generate completions 310 * with error for drain WRs unless the QP has been moved to 311 * RTS first. This work-around leaves a window where a QP has 312 * moved to error asynchronously, but this will eventually get 313 * fixed in firmware, so let's not error out if modify QP 314 * fails. 315 */ 316 qp_attr.qp_state = IB_QPS_RTS; 317 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 318 if (ret) { 319 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 320 return 0; 321 } 322 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 323 if (ret) { 324 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 325 return 0; 326 } 327 328 return 0; 329 } 330 331 static void ipoib_cm_init_rx_wr(struct net_device *dev, 332 struct ib_recv_wr *wr, 333 struct ib_sge *sge) 334 { 335 struct ipoib_dev_priv *priv = ipoib_priv(dev); 336 int i; 337 338 for (i = 0; i < priv->cm.num_frags; ++i) 339 sge[i].lkey = priv->pd->local_dma_lkey; 340 341 sge[0].length = IPOIB_CM_HEAD_SIZE; 342 for (i = 1; i < priv->cm.num_frags; ++i) 343 sge[i].length = PAGE_SIZE; 344 345 wr->next = NULL; 346 wr->sg_list = sge; 347 wr->num_sge = priv->cm.num_frags; 348 } 349 350 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id, 351 struct ipoib_cm_rx *rx) 352 { 353 struct ipoib_dev_priv *priv = ipoib_priv(dev); 354 struct { 355 struct ib_recv_wr wr; 356 struct ib_sge sge[IPOIB_CM_RX_SG]; 357 } *t; 358 int ret; 359 int i; 360 361 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring); 362 if (!rx->rx_ring) 363 return -ENOMEM; 364 365 t = kmalloc(sizeof *t, GFP_KERNEL); 366 if (!t) { 367 ret = -ENOMEM; 368 goto err_free_1; 369 } 370 371 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge); 372 373 spin_lock_irq(&priv->lock); 374 375 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) { 376 spin_unlock_irq(&priv->lock); 377 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0); 378 ret = -EINVAL; 379 goto err_free; 380 } else 381 ++priv->cm.nonsrq_conn_qp; 382 383 spin_unlock_irq(&priv->lock); 384 385 for (i = 0; i < ipoib_recvq_size; ++i) { 386 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1, 387 rx->rx_ring[i].mapping, 388 GFP_KERNEL)) { 389 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); 390 ret = -ENOMEM; 391 goto err_count; 392 } 393 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i); 394 if (ret) { 395 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq " 396 "failed for buf %d\n", i); 397 ret = -EIO; 398 goto err_count; 399 } 400 } 401 402 rx->recv_count = ipoib_recvq_size; 403 404 kfree(t); 405 406 return 0; 407 408 err_count: 409 spin_lock_irq(&priv->lock); 410 --priv->cm.nonsrq_conn_qp; 411 spin_unlock_irq(&priv->lock); 412 413 err_free: 414 kfree(t); 415 416 err_free_1: 417 ipoib_cm_free_rx_ring(dev, rx->rx_ring); 418 419 return ret; 420 } 421 422 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, 423 struct ib_qp *qp, struct ib_cm_req_event_param *req, 424 unsigned psn) 425 { 426 struct ipoib_dev_priv *priv = ipoib_priv(dev); 427 struct ipoib_cm_data data = {}; 428 struct ib_cm_rep_param rep = {}; 429 430 data.qpn = cpu_to_be32(priv->qp->qp_num); 431 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 432 433 rep.private_data = &data; 434 rep.private_data_len = sizeof data; 435 rep.flow_control = 0; 436 rep.rnr_retry_count = req->rnr_retry_count; 437 rep.srq = ipoib_cm_has_srq(dev); 438 rep.qp_num = qp->qp_num; 439 rep.starting_psn = psn; 440 return ib_send_cm_rep(cm_id, &rep); 441 } 442 443 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 444 { 445 struct net_device *dev = cm_id->context; 446 struct ipoib_dev_priv *priv = ipoib_priv(dev); 447 struct ipoib_cm_rx *p; 448 unsigned psn; 449 int ret; 450 451 ipoib_dbg(priv, "REQ arrived\n"); 452 p = kzalloc(sizeof *p, GFP_KERNEL); 453 if (!p) 454 return -ENOMEM; 455 p->dev = dev; 456 p->id = cm_id; 457 cm_id->context = p; 458 p->state = IPOIB_CM_RX_LIVE; 459 p->jiffies = jiffies; 460 INIT_LIST_HEAD(&p->list); 461 462 p->qp = ipoib_cm_create_rx_qp(dev, p); 463 if (IS_ERR(p->qp)) { 464 ret = PTR_ERR(p->qp); 465 goto err_qp; 466 } 467 468 psn = prandom_u32() & 0xffffff; 469 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); 470 if (ret) 471 goto err_modify; 472 473 if (!ipoib_cm_has_srq(dev)) { 474 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p); 475 if (ret) 476 goto err_modify; 477 } 478 479 spin_lock_irq(&priv->lock); 480 queue_delayed_work(priv->wq, 481 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 482 /* Add this entry to passive ids list head, but do not re-add it 483 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */ 484 p->jiffies = jiffies; 485 if (p->state == IPOIB_CM_RX_LIVE) 486 list_move(&p->list, &priv->cm.passive_ids); 487 spin_unlock_irq(&priv->lock); 488 489 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); 490 if (ret) { 491 ipoib_warn(priv, "failed to send REP: %d\n", ret); 492 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 493 ipoib_warn(priv, "unable to move qp to error state\n"); 494 } 495 return 0; 496 497 err_modify: 498 ib_destroy_qp(p->qp); 499 err_qp: 500 kfree(p); 501 return ret; 502 } 503 504 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, 505 struct ib_cm_event *event) 506 { 507 struct ipoib_cm_rx *p; 508 struct ipoib_dev_priv *priv; 509 510 switch (event->event) { 511 case IB_CM_REQ_RECEIVED: 512 return ipoib_cm_req_handler(cm_id, event); 513 case IB_CM_DREQ_RECEIVED: 514 ib_send_cm_drep(cm_id, NULL, 0); 515 /* Fall through */ 516 case IB_CM_REJ_RECEIVED: 517 p = cm_id->context; 518 priv = ipoib_priv(p->dev); 519 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE)) 520 ipoib_warn(priv, "unable to move qp to error state\n"); 521 /* Fall through */ 522 default: 523 return 0; 524 } 525 } 526 /* Adjust length of skb with fragments to match received data */ 527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, 528 unsigned int length, struct sk_buff *toskb) 529 { 530 int i, num_frags; 531 unsigned int size; 532 533 /* put header into skb */ 534 size = min(length, hdr_space); 535 skb->tail += size; 536 skb->len += size; 537 length -= size; 538 539 num_frags = skb_shinfo(skb)->nr_frags; 540 for (i = 0; i < num_frags; i++) { 541 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 542 543 if (length == 0) { 544 /* don't need this page */ 545 skb_fill_page_desc(toskb, i, skb_frag_page(frag), 546 0, PAGE_SIZE); 547 --skb_shinfo(skb)->nr_frags; 548 } else { 549 size = min(length, (unsigned) PAGE_SIZE); 550 551 skb_frag_size_set(frag, size); 552 skb->data_len += size; 553 skb->truesize += size; 554 skb->len += size; 555 length -= size; 556 } 557 } 558 } 559 560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) 561 { 562 struct ipoib_dev_priv *priv = ipoib_priv(dev); 563 struct ipoib_cm_rx_buf *rx_ring; 564 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV); 565 struct sk_buff *skb, *newskb; 566 struct ipoib_cm_rx *p; 567 unsigned long flags; 568 u64 mapping[IPOIB_CM_RX_SG]; 569 int frags; 570 int has_srq; 571 struct sk_buff *small_skb; 572 573 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n", 574 wr_id, wc->status); 575 576 if (unlikely(wr_id >= ipoib_recvq_size)) { 577 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) { 578 spin_lock_irqsave(&priv->lock, flags); 579 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list); 580 ipoib_cm_start_rx_drain(priv); 581 queue_work(priv->wq, &priv->cm.rx_reap_task); 582 spin_unlock_irqrestore(&priv->lock, flags); 583 } else 584 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", 585 wr_id, ipoib_recvq_size); 586 return; 587 } 588 589 p = wc->qp->qp_context; 590 591 has_srq = ipoib_cm_has_srq(dev); 592 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring; 593 594 skb = rx_ring[wr_id].skb; 595 596 if (unlikely(wc->status != IB_WC_SUCCESS)) { 597 ipoib_dbg(priv, "cm recv error " 598 "(status=%d, wrid=%d vend_err %x)\n", 599 wc->status, wr_id, wc->vendor_err); 600 ++dev->stats.rx_dropped; 601 if (has_srq) 602 goto repost; 603 else { 604 if (!--p->recv_count) { 605 spin_lock_irqsave(&priv->lock, flags); 606 list_move(&p->list, &priv->cm.rx_reap_list); 607 spin_unlock_irqrestore(&priv->lock, flags); 608 queue_work(priv->wq, &priv->cm.rx_reap_task); 609 } 610 return; 611 } 612 } 613 614 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) { 615 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { 616 spin_lock_irqsave(&priv->lock, flags); 617 p->jiffies = jiffies; 618 /* Move this entry to list head, but do not re-add it 619 * if it has been moved out of list. */ 620 if (p->state == IPOIB_CM_RX_LIVE) 621 list_move(&p->list, &priv->cm.passive_ids); 622 spin_unlock_irqrestore(&priv->lock, flags); 623 } 624 } 625 626 if (wc->byte_len < IPOIB_CM_COPYBREAK) { 627 int dlen = wc->byte_len; 628 629 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE); 630 if (small_skb) { 631 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE); 632 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0], 633 dlen, DMA_FROM_DEVICE); 634 skb_copy_from_linear_data(skb, small_skb->data, dlen); 635 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0], 636 dlen, DMA_FROM_DEVICE); 637 skb_put(small_skb, dlen); 638 skb = small_skb; 639 goto copied; 640 } 641 } 642 643 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, 644 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; 645 646 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, 647 mapping, GFP_ATOMIC); 648 if (unlikely(!newskb)) { 649 /* 650 * If we can't allocate a new RX buffer, dump 651 * this packet and reuse the old buffer. 652 */ 653 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); 654 ++dev->stats.rx_dropped; 655 goto repost; 656 } 657 658 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping); 659 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); 660 661 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", 662 wc->byte_len, wc->slid); 663 664 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); 665 666 copied: 667 skb->protocol = ((struct ipoib_header *) skb->data)->proto; 668 skb_add_pseudo_hdr(skb); 669 670 ++dev->stats.rx_packets; 671 dev->stats.rx_bytes += skb->len; 672 673 skb->dev = dev; 674 /* XXX get correct PACKET_ type here */ 675 skb->pkt_type = PACKET_HOST; 676 netif_receive_skb(skb); 677 678 repost: 679 if (has_srq) { 680 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id))) 681 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed " 682 "for buf %d\n", wr_id); 683 } else { 684 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, 685 &priv->cm.rx_wr, 686 priv->cm.rx_sge, 687 wr_id))) { 688 --p->recv_count; 689 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed " 690 "for buf %d\n", wr_id); 691 } 692 } 693 } 694 695 static inline int post_send(struct ipoib_dev_priv *priv, 696 struct ipoib_cm_tx *tx, 697 unsigned int wr_id, 698 struct ipoib_tx_buf *tx_req) 699 { 700 struct ib_send_wr *bad_wr; 701 702 ipoib_build_sge(priv, tx_req); 703 704 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM; 705 706 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr); 707 } 708 709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) 710 { 711 struct ipoib_dev_priv *priv = ipoib_priv(dev); 712 struct ipoib_tx_buf *tx_req; 713 int rc; 714 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb); 715 716 if (unlikely(skb->len > tx->mtu)) { 717 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", 718 skb->len, tx->mtu); 719 ++dev->stats.tx_dropped; 720 ++dev->stats.tx_errors; 721 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); 722 return; 723 } 724 if (skb_shinfo(skb)->nr_frags > usable_sge) { 725 if (skb_linearize(skb) < 0) { 726 ipoib_warn(priv, "skb could not be linearized\n"); 727 ++dev->stats.tx_dropped; 728 ++dev->stats.tx_errors; 729 dev_kfree_skb_any(skb); 730 return; 731 } 732 /* Does skb_linearize return ok without reducing nr_frags? */ 733 if (skb_shinfo(skb)->nr_frags > usable_sge) { 734 ipoib_warn(priv, "too many frags after skb linearize\n"); 735 ++dev->stats.tx_dropped; 736 ++dev->stats.tx_errors; 737 dev_kfree_skb_any(skb); 738 return; 739 } 740 } 741 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", 742 tx->tx_head, skb->len, tx->qp->qp_num); 743 744 /* 745 * We put the skb into the tx_ring _before_ we call post_send() 746 * because it's entirely possible that the completion handler will 747 * run before we execute anything after the post_send(). That 748 * means we have to make sure everything is properly recorded and 749 * our state is consistent before we call post_send(). 750 */ 751 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; 752 tx_req->skb = skb; 753 754 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) { 755 ++dev->stats.tx_errors; 756 dev_kfree_skb_any(skb); 757 return; 758 } 759 760 skb_orphan(skb); 761 skb_dst_drop(skb); 762 763 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req); 764 if (unlikely(rc)) { 765 ipoib_warn(priv, "post_send failed, error %d\n", rc); 766 ++dev->stats.tx_errors; 767 ipoib_dma_unmap_tx(priv, tx_req); 768 dev_kfree_skb_any(skb); 769 } else { 770 netif_trans_update(dev); 771 ++tx->tx_head; 772 773 if (++priv->tx_outstanding == ipoib_sendq_size) { 774 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", 775 tx->qp->qp_num); 776 netif_stop_queue(dev); 777 rc = ib_req_notify_cq(priv->send_cq, 778 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); 779 if (rc < 0) 780 ipoib_warn(priv, "request notify on send CQ failed\n"); 781 else if (rc) 782 ipoib_send_comp_handler(priv->send_cq, dev); 783 } 784 } 785 } 786 787 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc) 788 { 789 struct ipoib_dev_priv *priv = ipoib_priv(dev); 790 struct ipoib_cm_tx *tx = wc->qp->qp_context; 791 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM; 792 struct ipoib_tx_buf *tx_req; 793 unsigned long flags; 794 795 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n", 796 wr_id, wc->status); 797 798 if (unlikely(wr_id >= ipoib_sendq_size)) { 799 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", 800 wr_id, ipoib_sendq_size); 801 return; 802 } 803 804 tx_req = &tx->tx_ring[wr_id]; 805 806 ipoib_dma_unmap_tx(priv, tx_req); 807 808 /* FIXME: is this right? Shouldn't we only increment on success? */ 809 ++dev->stats.tx_packets; 810 dev->stats.tx_bytes += tx_req->skb->len; 811 812 dev_kfree_skb_any(tx_req->skb); 813 814 netif_tx_lock(dev); 815 816 ++tx->tx_tail; 817 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 818 netif_queue_stopped(dev) && 819 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 820 netif_wake_queue(dev); 821 822 if (wc->status != IB_WC_SUCCESS && 823 wc->status != IB_WC_WR_FLUSH_ERR) { 824 struct ipoib_neigh *neigh; 825 826 /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle, 827 * so don't make waves. 828 */ 829 if (wc->status == IB_WC_RNR_RETRY_EXC_ERR || 830 wc->status == IB_WC_RETRY_EXC_ERR) 831 ipoib_dbg(priv, 832 "%s: failed cm send event (status=%d, wrid=%d vend_err 0x%x)\n", 833 __func__, wc->status, wr_id, wc->vendor_err); 834 else 835 ipoib_warn(priv, 836 "%s: failed cm send event (status=%d, wrid=%d vend_err 0x%x)\n", 837 __func__, wc->status, wr_id, wc->vendor_err); 838 839 spin_lock_irqsave(&priv->lock, flags); 840 neigh = tx->neigh; 841 842 if (neigh) { 843 neigh->cm = NULL; 844 ipoib_neigh_free(neigh); 845 846 tx->neigh = NULL; 847 } 848 849 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 850 list_move(&tx->list, &priv->cm.reap_list); 851 queue_work(priv->wq, &priv->cm.reap_task); 852 } 853 854 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); 855 856 spin_unlock_irqrestore(&priv->lock, flags); 857 } 858 859 netif_tx_unlock(dev); 860 } 861 862 int ipoib_cm_dev_open(struct net_device *dev) 863 { 864 struct ipoib_dev_priv *priv = ipoib_priv(dev); 865 int ret; 866 867 if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) 868 return 0; 869 870 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); 871 if (IS_ERR(priv->cm.id)) { 872 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); 873 ret = PTR_ERR(priv->cm.id); 874 goto err_cm; 875 } 876 877 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), 878 0); 879 if (ret) { 880 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, 881 IPOIB_CM_IETF_ID | priv->qp->qp_num); 882 goto err_listen; 883 } 884 885 return 0; 886 887 err_listen: 888 ib_destroy_cm_id(priv->cm.id); 889 err_cm: 890 priv->cm.id = NULL; 891 return ret; 892 } 893 894 static void ipoib_cm_free_rx_reap_list(struct net_device *dev) 895 { 896 struct ipoib_dev_priv *priv = ipoib_priv(dev); 897 struct ipoib_cm_rx *rx, *n; 898 LIST_HEAD(list); 899 900 spin_lock_irq(&priv->lock); 901 list_splice_init(&priv->cm.rx_reap_list, &list); 902 spin_unlock_irq(&priv->lock); 903 904 list_for_each_entry_safe(rx, n, &list, list) { 905 ib_destroy_cm_id(rx->id); 906 ib_destroy_qp(rx->qp); 907 if (!ipoib_cm_has_srq(dev)) { 908 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring); 909 spin_lock_irq(&priv->lock); 910 --priv->cm.nonsrq_conn_qp; 911 spin_unlock_irq(&priv->lock); 912 } 913 kfree(rx); 914 } 915 } 916 917 void ipoib_cm_dev_stop(struct net_device *dev) 918 { 919 struct ipoib_dev_priv *priv = ipoib_priv(dev); 920 struct ipoib_cm_rx *p; 921 unsigned long begin; 922 int ret; 923 924 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id) 925 return; 926 927 ib_destroy_cm_id(priv->cm.id); 928 priv->cm.id = NULL; 929 930 spin_lock_irq(&priv->lock); 931 while (!list_empty(&priv->cm.passive_ids)) { 932 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); 933 list_move(&p->list, &priv->cm.rx_error_list); 934 p->state = IPOIB_CM_RX_ERROR; 935 spin_unlock_irq(&priv->lock); 936 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 937 if (ret) 938 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 939 spin_lock_irq(&priv->lock); 940 } 941 942 /* Wait for all RX to be drained */ 943 begin = jiffies; 944 945 while (!list_empty(&priv->cm.rx_error_list) || 946 !list_empty(&priv->cm.rx_flush_list) || 947 !list_empty(&priv->cm.rx_drain_list)) { 948 if (time_after(jiffies, begin + 5 * HZ)) { 949 ipoib_warn(priv, "RX drain timing out\n"); 950 951 /* 952 * assume the HW is wedged and just free up everything. 953 */ 954 list_splice_init(&priv->cm.rx_flush_list, 955 &priv->cm.rx_reap_list); 956 list_splice_init(&priv->cm.rx_error_list, 957 &priv->cm.rx_reap_list); 958 list_splice_init(&priv->cm.rx_drain_list, 959 &priv->cm.rx_reap_list); 960 break; 961 } 962 spin_unlock_irq(&priv->lock); 963 usleep_range(1000, 2000); 964 ipoib_drain_cq(dev); 965 spin_lock_irq(&priv->lock); 966 } 967 968 spin_unlock_irq(&priv->lock); 969 970 ipoib_cm_free_rx_reap_list(dev); 971 972 cancel_delayed_work(&priv->cm.stale_task); 973 } 974 975 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) 976 { 977 struct ipoib_cm_tx *p = cm_id->context; 978 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 979 struct ipoib_cm_data *data = event->private_data; 980 struct sk_buff_head skqueue; 981 struct ib_qp_attr qp_attr; 982 int qp_attr_mask, ret; 983 struct sk_buff *skb; 984 985 p->mtu = be32_to_cpu(data->mtu); 986 987 if (p->mtu <= IPOIB_ENCAP_LEN) { 988 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n", 989 p->mtu, IPOIB_ENCAP_LEN); 990 return -EINVAL; 991 } 992 993 qp_attr.qp_state = IB_QPS_RTR; 994 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 995 if (ret) { 996 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); 997 return ret; 998 } 999 1000 qp_attr.rq_psn = 0 /* FIXME */; 1001 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 1002 if (ret) { 1003 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); 1004 return ret; 1005 } 1006 1007 qp_attr.qp_state = IB_QPS_RTS; 1008 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); 1009 if (ret) { 1010 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); 1011 return ret; 1012 } 1013 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); 1014 if (ret) { 1015 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); 1016 return ret; 1017 } 1018 1019 skb_queue_head_init(&skqueue); 1020 1021 spin_lock_irq(&priv->lock); 1022 set_bit(IPOIB_FLAG_OPER_UP, &p->flags); 1023 if (p->neigh) 1024 while ((skb = __skb_dequeue(&p->neigh->queue))) 1025 __skb_queue_tail(&skqueue, skb); 1026 spin_unlock_irq(&priv->lock); 1027 1028 while ((skb = __skb_dequeue(&skqueue))) { 1029 skb->dev = p->dev; 1030 ret = dev_queue_xmit(skb); 1031 if (ret) 1032 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n", 1033 __func__, ret); 1034 } 1035 1036 ret = ib_send_cm_rtu(cm_id, NULL, 0); 1037 if (ret) { 1038 ipoib_warn(priv, "failed to send RTU: %d\n", ret); 1039 return ret; 1040 } 1041 return 0; 1042 } 1043 1044 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx) 1045 { 1046 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1047 struct ib_qp_init_attr attr = { 1048 .send_cq = priv->recv_cq, 1049 .recv_cq = priv->recv_cq, 1050 .srq = priv->cm.srq, 1051 .cap.max_send_wr = ipoib_sendq_size, 1052 .cap.max_send_sge = 1, 1053 .sq_sig_type = IB_SIGNAL_ALL_WR, 1054 .qp_type = IB_QPT_RC, 1055 .qp_context = tx, 1056 .create_flags = 0 1057 }; 1058 struct ib_qp *tx_qp; 1059 1060 if (dev->features & NETIF_F_SG) 1061 attr.cap.max_send_sge = 1062 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1); 1063 1064 tx_qp = ib_create_qp(priv->pd, &attr); 1065 tx->max_send_sge = attr.cap.max_send_sge; 1066 return tx_qp; 1067 } 1068 1069 static int ipoib_cm_send_req(struct net_device *dev, 1070 struct ib_cm_id *id, struct ib_qp *qp, 1071 u32 qpn, 1072 struct sa_path_rec *pathrec) 1073 { 1074 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1075 struct ipoib_cm_data data = {}; 1076 struct ib_cm_req_param req = {}; 1077 1078 data.qpn = cpu_to_be32(priv->qp->qp_num); 1079 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); 1080 1081 req.primary_path = pathrec; 1082 req.alternate_path = NULL; 1083 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); 1084 req.qp_num = qp->qp_num; 1085 req.qp_type = qp->qp_type; 1086 req.private_data = &data; 1087 req.private_data_len = sizeof data; 1088 req.flow_control = 0; 1089 1090 req.starting_psn = 0; /* FIXME */ 1091 1092 /* 1093 * Pick some arbitrary defaults here; we could make these 1094 * module parameters if anyone cared about setting them. 1095 */ 1096 req.responder_resources = 4; 1097 req.remote_cm_response_timeout = 20; 1098 req.local_cm_response_timeout = 20; 1099 req.retry_count = 0; /* RFC draft warns against retries */ 1100 req.rnr_retry_count = 0; /* RFC draft warns against retries */ 1101 req.max_cm_retries = 15; 1102 req.srq = ipoib_cm_has_srq(dev); 1103 return ib_send_cm_req(id, &req); 1104 } 1105 1106 static int ipoib_cm_modify_tx_init(struct net_device *dev, 1107 struct ib_cm_id *cm_id, struct ib_qp *qp) 1108 { 1109 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1110 struct ib_qp_attr qp_attr; 1111 int qp_attr_mask, ret; 1112 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); 1113 if (ret) { 1114 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret); 1115 return ret; 1116 } 1117 1118 qp_attr.qp_state = IB_QPS_INIT; 1119 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; 1120 qp_attr.port_num = priv->port; 1121 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; 1122 1123 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); 1124 if (ret) { 1125 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); 1126 return ret; 1127 } 1128 return 0; 1129 } 1130 1131 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, 1132 struct sa_path_rec *pathrec) 1133 { 1134 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 1135 unsigned int noio_flag; 1136 int ret; 1137 1138 noio_flag = memalloc_noio_save(); 1139 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring)); 1140 if (!p->tx_ring) { 1141 ret = -ENOMEM; 1142 goto err_tx; 1143 } 1144 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring); 1145 1146 p->qp = ipoib_cm_create_tx_qp(p->dev, p); 1147 memalloc_noio_restore(noio_flag); 1148 if (IS_ERR(p->qp)) { 1149 ret = PTR_ERR(p->qp); 1150 ipoib_warn(priv, "failed to create tx qp: %d\n", ret); 1151 goto err_qp; 1152 } 1153 1154 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); 1155 if (IS_ERR(p->id)) { 1156 ret = PTR_ERR(p->id); 1157 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); 1158 goto err_id; 1159 } 1160 1161 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); 1162 if (ret) { 1163 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); 1164 goto err_modify_send; 1165 } 1166 1167 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); 1168 if (ret) { 1169 ipoib_warn(priv, "failed to send cm req: %d\n", ret); 1170 goto err_modify_send; 1171 } 1172 1173 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n", 1174 p->qp->qp_num, pathrec->dgid.raw, qpn); 1175 1176 return 0; 1177 1178 err_modify_send: 1179 ib_destroy_cm_id(p->id); 1180 err_id: 1181 p->id = NULL; 1182 ib_destroy_qp(p->qp); 1183 err_qp: 1184 p->qp = NULL; 1185 vfree(p->tx_ring); 1186 err_tx: 1187 return ret; 1188 } 1189 1190 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) 1191 { 1192 struct ipoib_dev_priv *priv = ipoib_priv(p->dev); 1193 struct ipoib_tx_buf *tx_req; 1194 unsigned long begin; 1195 1196 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", 1197 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); 1198 1199 if (p->id) 1200 ib_destroy_cm_id(p->id); 1201 1202 if (p->tx_ring) { 1203 /* Wait for all sends to complete */ 1204 begin = jiffies; 1205 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1206 if (time_after(jiffies, begin + 5 * HZ)) { 1207 ipoib_warn(priv, "timing out; %d sends not completed\n", 1208 p->tx_head - p->tx_tail); 1209 goto timeout; 1210 } 1211 1212 usleep_range(1000, 2000); 1213 } 1214 } 1215 1216 timeout: 1217 1218 while ((int) p->tx_tail - (int) p->tx_head < 0) { 1219 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; 1220 ipoib_dma_unmap_tx(priv, tx_req); 1221 dev_kfree_skb_any(tx_req->skb); 1222 ++p->tx_tail; 1223 netif_tx_lock_bh(p->dev); 1224 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) && 1225 netif_queue_stopped(p->dev) && 1226 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1227 netif_wake_queue(p->dev); 1228 netif_tx_unlock_bh(p->dev); 1229 } 1230 1231 if (p->qp) 1232 ib_destroy_qp(p->qp); 1233 1234 vfree(p->tx_ring); 1235 kfree(p); 1236 } 1237 1238 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, 1239 struct ib_cm_event *event) 1240 { 1241 struct ipoib_cm_tx *tx = cm_id->context; 1242 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev); 1243 struct net_device *dev = priv->dev; 1244 struct ipoib_neigh *neigh; 1245 unsigned long flags; 1246 int ret; 1247 1248 switch (event->event) { 1249 case IB_CM_DREQ_RECEIVED: 1250 ipoib_dbg(priv, "DREQ received.\n"); 1251 ib_send_cm_drep(cm_id, NULL, 0); 1252 break; 1253 case IB_CM_REP_RECEIVED: 1254 ipoib_dbg(priv, "REP received.\n"); 1255 ret = ipoib_cm_rep_handler(cm_id, event); 1256 if (ret) 1257 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 1258 NULL, 0, NULL, 0); 1259 break; 1260 case IB_CM_REQ_ERROR: 1261 case IB_CM_REJ_RECEIVED: 1262 case IB_CM_TIMEWAIT_EXIT: 1263 ipoib_dbg(priv, "CM error %d.\n", event->event); 1264 netif_tx_lock_bh(dev); 1265 spin_lock_irqsave(&priv->lock, flags); 1266 neigh = tx->neigh; 1267 1268 if (neigh) { 1269 neigh->cm = NULL; 1270 ipoib_neigh_free(neigh); 1271 1272 tx->neigh = NULL; 1273 } 1274 1275 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1276 list_move(&tx->list, &priv->cm.reap_list); 1277 queue_work(priv->wq, &priv->cm.reap_task); 1278 } 1279 1280 spin_unlock_irqrestore(&priv->lock, flags); 1281 netif_tx_unlock_bh(dev); 1282 break; 1283 default: 1284 break; 1285 } 1286 1287 return 0; 1288 } 1289 1290 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, 1291 struct ipoib_neigh *neigh) 1292 { 1293 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1294 struct ipoib_cm_tx *tx; 1295 1296 tx = kzalloc(sizeof *tx, GFP_ATOMIC); 1297 if (!tx) 1298 return NULL; 1299 1300 neigh->cm = tx; 1301 tx->neigh = neigh; 1302 tx->path = path; 1303 tx->dev = dev; 1304 list_add(&tx->list, &priv->cm.start_list); 1305 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); 1306 queue_work(priv->wq, &priv->cm.start_task); 1307 return tx; 1308 } 1309 1310 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) 1311 { 1312 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev); 1313 unsigned long flags; 1314 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { 1315 spin_lock_irqsave(&priv->lock, flags); 1316 list_move(&tx->list, &priv->cm.reap_list); 1317 queue_work(priv->wq, &priv->cm.reap_task); 1318 ipoib_dbg(priv, "Reap connection for gid %pI6\n", 1319 tx->neigh->daddr + 4); 1320 tx->neigh = NULL; 1321 spin_unlock_irqrestore(&priv->lock, flags); 1322 } 1323 } 1324 1325 #define QPN_AND_OPTIONS_OFFSET 4 1326 1327 static void ipoib_cm_tx_start(struct work_struct *work) 1328 { 1329 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1330 cm.start_task); 1331 struct net_device *dev = priv->dev; 1332 struct ipoib_neigh *neigh; 1333 struct ipoib_cm_tx *p; 1334 unsigned long flags; 1335 struct ipoib_path *path; 1336 int ret; 1337 1338 struct sa_path_rec pathrec; 1339 u32 qpn; 1340 1341 netif_tx_lock_bh(dev); 1342 spin_lock_irqsave(&priv->lock, flags); 1343 1344 while (!list_empty(&priv->cm.start_list)) { 1345 p = list_entry(priv->cm.start_list.next, typeof(*p), list); 1346 list_del_init(&p->list); 1347 neigh = p->neigh; 1348 1349 qpn = IPOIB_QPN(neigh->daddr); 1350 /* 1351 * As long as the search is with these 2 locks, 1352 * path existence indicates its validity. 1353 */ 1354 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1355 if (!path) { 1356 pr_info("%s ignore not valid path %pI6\n", 1357 __func__, 1358 neigh->daddr + QPN_AND_OPTIONS_OFFSET); 1359 goto free_neigh; 1360 } 1361 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); 1362 1363 spin_unlock_irqrestore(&priv->lock, flags); 1364 netif_tx_unlock_bh(dev); 1365 1366 ret = ipoib_cm_tx_init(p, qpn, &pathrec); 1367 1368 netif_tx_lock_bh(dev); 1369 spin_lock_irqsave(&priv->lock, flags); 1370 1371 if (ret) { 1372 free_neigh: 1373 neigh = p->neigh; 1374 if (neigh) { 1375 neigh->cm = NULL; 1376 ipoib_neigh_free(neigh); 1377 } 1378 list_del(&p->list); 1379 kfree(p); 1380 } 1381 } 1382 1383 spin_unlock_irqrestore(&priv->lock, flags); 1384 netif_tx_unlock_bh(dev); 1385 } 1386 1387 static void ipoib_cm_tx_reap(struct work_struct *work) 1388 { 1389 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1390 cm.reap_task); 1391 struct net_device *dev = priv->dev; 1392 struct ipoib_cm_tx *p; 1393 unsigned long flags; 1394 1395 netif_tx_lock_bh(dev); 1396 spin_lock_irqsave(&priv->lock, flags); 1397 1398 while (!list_empty(&priv->cm.reap_list)) { 1399 p = list_entry(priv->cm.reap_list.next, typeof(*p), list); 1400 list_del_init(&p->list); 1401 spin_unlock_irqrestore(&priv->lock, flags); 1402 netif_tx_unlock_bh(dev); 1403 ipoib_cm_tx_destroy(p); 1404 netif_tx_lock_bh(dev); 1405 spin_lock_irqsave(&priv->lock, flags); 1406 } 1407 1408 spin_unlock_irqrestore(&priv->lock, flags); 1409 netif_tx_unlock_bh(dev); 1410 } 1411 1412 static void ipoib_cm_skb_reap(struct work_struct *work) 1413 { 1414 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1415 cm.skb_task); 1416 struct net_device *dev = priv->dev; 1417 struct sk_buff *skb; 1418 unsigned long flags; 1419 unsigned mtu = priv->mcast_mtu; 1420 1421 netif_tx_lock_bh(dev); 1422 spin_lock_irqsave(&priv->lock, flags); 1423 1424 while ((skb = skb_dequeue(&priv->cm.skb_queue))) { 1425 spin_unlock_irqrestore(&priv->lock, flags); 1426 netif_tx_unlock_bh(dev); 1427 1428 if (skb->protocol == htons(ETH_P_IP)) 1429 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); 1430 #if IS_ENABLED(CONFIG_IPV6) 1431 else if (skb->protocol == htons(ETH_P_IPV6)) 1432 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1433 #endif 1434 dev_kfree_skb_any(skb); 1435 1436 netif_tx_lock_bh(dev); 1437 spin_lock_irqsave(&priv->lock, flags); 1438 } 1439 1440 spin_unlock_irqrestore(&priv->lock, flags); 1441 netif_tx_unlock_bh(dev); 1442 } 1443 1444 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb, 1445 unsigned int mtu) 1446 { 1447 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1448 int e = skb_queue_empty(&priv->cm.skb_queue); 1449 1450 if (skb_dst(skb)) 1451 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1452 1453 skb_queue_tail(&priv->cm.skb_queue, skb); 1454 if (e) 1455 queue_work(priv->wq, &priv->cm.skb_task); 1456 } 1457 1458 static void ipoib_cm_rx_reap(struct work_struct *work) 1459 { 1460 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv, 1461 cm.rx_reap_task)->dev); 1462 } 1463 1464 static void ipoib_cm_stale_task(struct work_struct *work) 1465 { 1466 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 1467 cm.stale_task.work); 1468 struct ipoib_cm_rx *p; 1469 int ret; 1470 1471 spin_lock_irq(&priv->lock); 1472 while (!list_empty(&priv->cm.passive_ids)) { 1473 /* List is sorted by LRU, start from tail, 1474 * stop when we see a recently used entry */ 1475 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); 1476 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) 1477 break; 1478 list_move(&p->list, &priv->cm.rx_error_list); 1479 p->state = IPOIB_CM_RX_ERROR; 1480 spin_unlock_irq(&priv->lock); 1481 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE); 1482 if (ret) 1483 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret); 1484 spin_lock_irq(&priv->lock); 1485 } 1486 1487 if (!list_empty(&priv->cm.passive_ids)) 1488 queue_delayed_work(priv->wq, 1489 &priv->cm.stale_task, IPOIB_CM_RX_DELAY); 1490 spin_unlock_irq(&priv->lock); 1491 } 1492 1493 static ssize_t show_mode(struct device *d, struct device_attribute *attr, 1494 char *buf) 1495 { 1496 struct net_device *dev = to_net_dev(d); 1497 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1498 1499 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 1500 return sprintf(buf, "connected\n"); 1501 else 1502 return sprintf(buf, "datagram\n"); 1503 } 1504 1505 static ssize_t set_mode(struct device *d, struct device_attribute *attr, 1506 const char *buf, size_t count) 1507 { 1508 struct net_device *dev = to_net_dev(d); 1509 int ret; 1510 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1511 1512 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags)) 1513 return -EPERM; 1514 1515 if (!mutex_trylock(&priv->sysfs_mutex)) 1516 return restart_syscall(); 1517 1518 if (!rtnl_trylock()) { 1519 mutex_unlock(&priv->sysfs_mutex); 1520 return restart_syscall(); 1521 } 1522 1523 ret = ipoib_set_mode(dev, buf); 1524 1525 /* The assumption is that the function ipoib_set_mode returned 1526 * with the rtnl held by it, if not the value -EBUSY returned, 1527 * then no need to rtnl_unlock 1528 */ 1529 if (ret != -EBUSY) 1530 rtnl_unlock(); 1531 mutex_unlock(&priv->sysfs_mutex); 1532 1533 return (!ret || ret == -EBUSY) ? count : ret; 1534 } 1535 1536 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); 1537 1538 int ipoib_cm_add_mode_attr(struct net_device *dev) 1539 { 1540 return device_create_file(&dev->dev, &dev_attr_mode); 1541 } 1542 1543 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge) 1544 { 1545 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1546 struct ib_srq_init_attr srq_init_attr = { 1547 .srq_type = IB_SRQT_BASIC, 1548 .attr = { 1549 .max_wr = ipoib_recvq_size, 1550 .max_sge = max_sge 1551 } 1552 }; 1553 1554 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); 1555 if (IS_ERR(priv->cm.srq)) { 1556 if (PTR_ERR(priv->cm.srq) != -ENOSYS) 1557 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n", 1558 priv->ca->name, PTR_ERR(priv->cm.srq)); 1559 priv->cm.srq = NULL; 1560 return; 1561 } 1562 1563 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring); 1564 if (!priv->cm.srq_ring) { 1565 ib_destroy_srq(priv->cm.srq); 1566 priv->cm.srq = NULL; 1567 return; 1568 } 1569 1570 } 1571 1572 int ipoib_cm_dev_init(struct net_device *dev) 1573 { 1574 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1575 int max_srq_sge, i; 1576 1577 INIT_LIST_HEAD(&priv->cm.passive_ids); 1578 INIT_LIST_HEAD(&priv->cm.reap_list); 1579 INIT_LIST_HEAD(&priv->cm.start_list); 1580 INIT_LIST_HEAD(&priv->cm.rx_error_list); 1581 INIT_LIST_HEAD(&priv->cm.rx_flush_list); 1582 INIT_LIST_HEAD(&priv->cm.rx_drain_list); 1583 INIT_LIST_HEAD(&priv->cm.rx_reap_list); 1584 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); 1585 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); 1586 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); 1587 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap); 1588 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); 1589 1590 skb_queue_head_init(&priv->cm.skb_queue); 1591 1592 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge); 1593 1594 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge); 1595 ipoib_cm_create_srq(dev, max_srq_sge); 1596 if (ipoib_cm_has_srq(dev)) { 1597 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10; 1598 priv->cm.num_frags = max_srq_sge; 1599 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n", 1600 priv->cm.max_cm_mtu, priv->cm.num_frags); 1601 } else { 1602 priv->cm.max_cm_mtu = IPOIB_CM_MTU; 1603 priv->cm.num_frags = IPOIB_CM_RX_SG; 1604 } 1605 1606 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge); 1607 1608 if (ipoib_cm_has_srq(dev)) { 1609 for (i = 0; i < ipoib_recvq_size; ++i) { 1610 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i, 1611 priv->cm.num_frags - 1, 1612 priv->cm.srq_ring[i].mapping, 1613 GFP_KERNEL)) { 1614 ipoib_warn(priv, "failed to allocate " 1615 "receive buffer %d\n", i); 1616 ipoib_cm_dev_cleanup(dev); 1617 return -ENOMEM; 1618 } 1619 1620 if (ipoib_cm_post_receive_srq(dev, i)) { 1621 ipoib_warn(priv, "ipoib_cm_post_receive_srq " 1622 "failed for buf %d\n", i); 1623 ipoib_cm_dev_cleanup(dev); 1624 return -EIO; 1625 } 1626 } 1627 } 1628 1629 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; 1630 return 0; 1631 } 1632 1633 void ipoib_cm_dev_cleanup(struct net_device *dev) 1634 { 1635 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1636 int ret; 1637 1638 if (!priv->cm.srq) 1639 return; 1640 1641 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); 1642 1643 ret = ib_destroy_srq(priv->cm.srq); 1644 if (ret) 1645 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); 1646 1647 priv->cm.srq = NULL; 1648 if (!priv->cm.srq_ring) 1649 return; 1650 1651 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring); 1652 priv->cm.srq_ring = NULL; 1653 } 1654