1 /* 2 * Copyright (c) 2016, 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 "mlx5_ib.h" 34 35 struct mlx5_ib_gsi_wr { 36 struct ib_cqe cqe; 37 struct ib_wc wc; 38 int send_flags; 39 bool completed:1; 40 }; 41 42 struct mlx5_ib_gsi_qp { 43 struct ib_qp ibqp; 44 struct ib_qp *rx_qp; 45 u8 port_num; 46 struct ib_qp_cap cap; 47 enum ib_sig_type sq_sig_type; 48 /* Serialize qp state modifications */ 49 struct mutex mutex; 50 struct ib_cq *cq; 51 struct mlx5_ib_gsi_wr *outstanding_wrs; 52 u32 outstanding_pi, outstanding_ci; 53 int num_qps; 54 /* Protects access to the tx_qps. Post send operations synchronize 55 * with tx_qp creation in setup_qp(). Also protects the 56 * outstanding_wrs array and indices. 57 */ 58 spinlock_t lock; 59 struct ib_qp **tx_qps; 60 }; 61 62 static struct mlx5_ib_gsi_qp *gsi_qp(struct ib_qp *qp) 63 { 64 return container_of(qp, struct mlx5_ib_gsi_qp, ibqp); 65 } 66 67 static bool mlx5_ib_deth_sqpn_cap(struct mlx5_ib_dev *dev) 68 { 69 return MLX5_CAP_GEN(dev->mdev, set_deth_sqpn); 70 } 71 72 /* Call with gsi->lock locked */ 73 static void generate_completions(struct mlx5_ib_gsi_qp *gsi) 74 { 75 struct ib_cq *gsi_cq = gsi->ibqp.send_cq; 76 struct mlx5_ib_gsi_wr *wr; 77 u32 index; 78 79 for (index = gsi->outstanding_ci; index != gsi->outstanding_pi; 80 index++) { 81 wr = &gsi->outstanding_wrs[index % gsi->cap.max_send_wr]; 82 83 if (!wr->completed) 84 break; 85 86 if (gsi->sq_sig_type == IB_SIGNAL_ALL_WR || 87 wr->send_flags & IB_SEND_SIGNALED) 88 WARN_ON_ONCE(mlx5_ib_generate_wc(gsi_cq, &wr->wc)); 89 90 wr->completed = false; 91 } 92 93 gsi->outstanding_ci = index; 94 } 95 96 static void handle_single_completion(struct ib_cq *cq, struct ib_wc *wc) 97 { 98 struct mlx5_ib_gsi_qp *gsi = cq->cq_context; 99 struct mlx5_ib_gsi_wr *wr = 100 container_of(wc->wr_cqe, struct mlx5_ib_gsi_wr, cqe); 101 u64 wr_id; 102 unsigned long flags; 103 104 spin_lock_irqsave(&gsi->lock, flags); 105 wr->completed = true; 106 wr_id = wr->wc.wr_id; 107 wr->wc = *wc; 108 wr->wc.wr_id = wr_id; 109 wr->wc.qp = &gsi->ibqp; 110 111 generate_completions(gsi); 112 spin_unlock_irqrestore(&gsi->lock, flags); 113 } 114 115 struct ib_qp *mlx5_ib_gsi_create_qp(struct ib_pd *pd, 116 struct ib_qp_init_attr *init_attr) 117 { 118 struct mlx5_ib_dev *dev = to_mdev(pd->device); 119 struct mlx5_ib_gsi_qp *gsi; 120 struct ib_qp_init_attr hw_init_attr = *init_attr; 121 const u8 port_num = init_attr->port_num; 122 const int num_pkeys = pd->device->attrs.max_pkeys; 123 const int num_qps = mlx5_ib_deth_sqpn_cap(dev) ? num_pkeys : 0; 124 int ret; 125 126 mlx5_ib_dbg(dev, "creating GSI QP\n"); 127 128 if (port_num > ARRAY_SIZE(dev->devr.ports) || port_num < 1) { 129 mlx5_ib_warn(dev, 130 "invalid port number %d during GSI QP creation\n", 131 port_num); 132 return ERR_PTR(-EINVAL); 133 } 134 135 gsi = kzalloc(sizeof(*gsi), GFP_KERNEL); 136 if (!gsi) 137 return ERR_PTR(-ENOMEM); 138 139 gsi->tx_qps = kcalloc(num_qps, sizeof(*gsi->tx_qps), GFP_KERNEL); 140 if (!gsi->tx_qps) { 141 ret = -ENOMEM; 142 goto err_free; 143 } 144 145 gsi->outstanding_wrs = kcalloc(init_attr->cap.max_send_wr, 146 sizeof(*gsi->outstanding_wrs), 147 GFP_KERNEL); 148 if (!gsi->outstanding_wrs) { 149 ret = -ENOMEM; 150 goto err_free_tx; 151 } 152 153 mutex_init(&gsi->mutex); 154 155 mutex_lock(&dev->devr.mutex); 156 157 if (dev->devr.ports[port_num - 1].gsi) { 158 mlx5_ib_warn(dev, "GSI QP already exists on port %d\n", 159 port_num); 160 ret = -EBUSY; 161 goto err_free_wrs; 162 } 163 gsi->num_qps = num_qps; 164 spin_lock_init(&gsi->lock); 165 166 gsi->cap = init_attr->cap; 167 gsi->sq_sig_type = init_attr->sq_sig_type; 168 gsi->ibqp.qp_num = 1; 169 gsi->port_num = port_num; 170 171 gsi->cq = ib_alloc_cq(pd->device, gsi, init_attr->cap.max_send_wr, 0, 172 IB_POLL_SOFTIRQ); 173 if (IS_ERR(gsi->cq)) { 174 mlx5_ib_warn(dev, "unable to create send CQ for GSI QP. error %ld\n", 175 PTR_ERR(gsi->cq)); 176 ret = PTR_ERR(gsi->cq); 177 goto err_free_wrs; 178 } 179 180 hw_init_attr.qp_type = MLX5_IB_QPT_HW_GSI; 181 hw_init_attr.send_cq = gsi->cq; 182 if (num_qps) { 183 hw_init_attr.cap.max_send_wr = 0; 184 hw_init_attr.cap.max_send_sge = 0; 185 hw_init_attr.cap.max_inline_data = 0; 186 } 187 gsi->rx_qp = ib_create_qp(pd, &hw_init_attr); 188 if (IS_ERR(gsi->rx_qp)) { 189 mlx5_ib_warn(dev, "unable to create hardware GSI QP. error %ld\n", 190 PTR_ERR(gsi->rx_qp)); 191 ret = PTR_ERR(gsi->rx_qp); 192 goto err_destroy_cq; 193 } 194 195 dev->devr.ports[init_attr->port_num - 1].gsi = gsi; 196 197 mutex_unlock(&dev->devr.mutex); 198 199 return &gsi->ibqp; 200 201 err_destroy_cq: 202 ib_free_cq(gsi->cq); 203 err_free_wrs: 204 mutex_unlock(&dev->devr.mutex); 205 kfree(gsi->outstanding_wrs); 206 err_free_tx: 207 kfree(gsi->tx_qps); 208 err_free: 209 kfree(gsi); 210 return ERR_PTR(ret); 211 } 212 213 int mlx5_ib_gsi_destroy_qp(struct ib_qp *qp) 214 { 215 struct mlx5_ib_dev *dev = to_mdev(qp->device); 216 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp); 217 const int port_num = gsi->port_num; 218 int qp_index; 219 int ret; 220 221 mlx5_ib_dbg(dev, "destroying GSI QP\n"); 222 223 mutex_lock(&dev->devr.mutex); 224 ret = ib_destroy_qp(gsi->rx_qp); 225 if (ret) { 226 mlx5_ib_warn(dev, "unable to destroy hardware GSI QP. error %d\n", 227 ret); 228 mutex_unlock(&dev->devr.mutex); 229 return ret; 230 } 231 dev->devr.ports[port_num - 1].gsi = NULL; 232 mutex_unlock(&dev->devr.mutex); 233 gsi->rx_qp = NULL; 234 235 for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index) { 236 if (!gsi->tx_qps[qp_index]) 237 continue; 238 WARN_ON_ONCE(ib_destroy_qp(gsi->tx_qps[qp_index])); 239 gsi->tx_qps[qp_index] = NULL; 240 } 241 242 ib_free_cq(gsi->cq); 243 244 kfree(gsi->outstanding_wrs); 245 kfree(gsi->tx_qps); 246 kfree(gsi); 247 248 return 0; 249 } 250 251 static struct ib_qp *create_gsi_ud_qp(struct mlx5_ib_gsi_qp *gsi) 252 { 253 struct ib_pd *pd = gsi->rx_qp->pd; 254 struct ib_qp_init_attr init_attr = { 255 .event_handler = gsi->rx_qp->event_handler, 256 .qp_context = gsi->rx_qp->qp_context, 257 .send_cq = gsi->cq, 258 .recv_cq = gsi->rx_qp->recv_cq, 259 .cap = { 260 .max_send_wr = gsi->cap.max_send_wr, 261 .max_send_sge = gsi->cap.max_send_sge, 262 .max_inline_data = gsi->cap.max_inline_data, 263 }, 264 .sq_sig_type = gsi->sq_sig_type, 265 .qp_type = IB_QPT_UD, 266 .create_flags = mlx5_ib_create_qp_sqpn_qp1(), 267 }; 268 269 return ib_create_qp(pd, &init_attr); 270 } 271 272 static int modify_to_rts(struct mlx5_ib_gsi_qp *gsi, struct ib_qp *qp, 273 u16 qp_index) 274 { 275 struct mlx5_ib_dev *dev = to_mdev(qp->device); 276 struct ib_qp_attr attr; 277 int mask; 278 int ret; 279 280 mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_QKEY | IB_QP_PORT; 281 attr.qp_state = IB_QPS_INIT; 282 attr.pkey_index = qp_index; 283 attr.qkey = IB_QP1_QKEY; 284 attr.port_num = gsi->port_num; 285 ret = ib_modify_qp(qp, &attr, mask); 286 if (ret) { 287 mlx5_ib_err(dev, "could not change QP%d state to INIT: %d\n", 288 qp->qp_num, ret); 289 return ret; 290 } 291 292 attr.qp_state = IB_QPS_RTR; 293 ret = ib_modify_qp(qp, &attr, IB_QP_STATE); 294 if (ret) { 295 mlx5_ib_err(dev, "could not change QP%d state to RTR: %d\n", 296 qp->qp_num, ret); 297 return ret; 298 } 299 300 attr.qp_state = IB_QPS_RTS; 301 attr.sq_psn = 0; 302 ret = ib_modify_qp(qp, &attr, IB_QP_STATE | IB_QP_SQ_PSN); 303 if (ret) { 304 mlx5_ib_err(dev, "could not change QP%d state to RTS: %d\n", 305 qp->qp_num, ret); 306 return ret; 307 } 308 309 return 0; 310 } 311 312 static void setup_qp(struct mlx5_ib_gsi_qp *gsi, u16 qp_index) 313 { 314 struct ib_device *device = gsi->rx_qp->device; 315 struct mlx5_ib_dev *dev = to_mdev(device); 316 struct ib_qp *qp; 317 unsigned long flags; 318 u16 pkey; 319 int ret; 320 321 ret = ib_query_pkey(device, gsi->port_num, qp_index, &pkey); 322 if (ret) { 323 mlx5_ib_warn(dev, "unable to read P_Key at port %d, index %d\n", 324 gsi->port_num, qp_index); 325 return; 326 } 327 328 if (!pkey) { 329 mlx5_ib_dbg(dev, "invalid P_Key at port %d, index %d. Skipping.\n", 330 gsi->port_num, qp_index); 331 return; 332 } 333 334 spin_lock_irqsave(&gsi->lock, flags); 335 qp = gsi->tx_qps[qp_index]; 336 spin_unlock_irqrestore(&gsi->lock, flags); 337 if (qp) { 338 mlx5_ib_dbg(dev, "already existing GSI TX QP at port %d, index %d. Skipping\n", 339 gsi->port_num, qp_index); 340 return; 341 } 342 343 qp = create_gsi_ud_qp(gsi); 344 if (IS_ERR(qp)) { 345 mlx5_ib_warn(dev, "unable to create hardware UD QP for GSI: %ld\n", 346 PTR_ERR(qp)); 347 return; 348 } 349 350 ret = modify_to_rts(gsi, qp, qp_index); 351 if (ret) 352 goto err_destroy_qp; 353 354 spin_lock_irqsave(&gsi->lock, flags); 355 WARN_ON_ONCE(gsi->tx_qps[qp_index]); 356 gsi->tx_qps[qp_index] = qp; 357 spin_unlock_irqrestore(&gsi->lock, flags); 358 359 return; 360 361 err_destroy_qp: 362 WARN_ON_ONCE(qp); 363 } 364 365 static void setup_qps(struct mlx5_ib_gsi_qp *gsi) 366 { 367 u16 qp_index; 368 369 for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index) 370 setup_qp(gsi, qp_index); 371 } 372 373 int mlx5_ib_gsi_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr, 374 int attr_mask) 375 { 376 struct mlx5_ib_dev *dev = to_mdev(qp->device); 377 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp); 378 int ret; 379 380 mlx5_ib_dbg(dev, "modifying GSI QP to state %d\n", attr->qp_state); 381 382 mutex_lock(&gsi->mutex); 383 ret = ib_modify_qp(gsi->rx_qp, attr, attr_mask); 384 if (ret) { 385 mlx5_ib_warn(dev, "unable to modify GSI rx QP: %d\n", ret); 386 goto unlock; 387 } 388 389 if (to_mqp(gsi->rx_qp)->state == IB_QPS_RTS) 390 setup_qps(gsi); 391 392 unlock: 393 mutex_unlock(&gsi->mutex); 394 395 return ret; 396 } 397 398 int mlx5_ib_gsi_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr, 399 int qp_attr_mask, 400 struct ib_qp_init_attr *qp_init_attr) 401 { 402 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp); 403 int ret; 404 405 mutex_lock(&gsi->mutex); 406 ret = ib_query_qp(gsi->rx_qp, qp_attr, qp_attr_mask, qp_init_attr); 407 qp_init_attr->cap = gsi->cap; 408 mutex_unlock(&gsi->mutex); 409 410 return ret; 411 } 412 413 /* Call with gsi->lock locked */ 414 static int mlx5_ib_add_outstanding_wr(struct mlx5_ib_gsi_qp *gsi, 415 struct ib_ud_wr *wr, struct ib_wc *wc) 416 { 417 struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device); 418 struct mlx5_ib_gsi_wr *gsi_wr; 419 420 if (gsi->outstanding_pi == gsi->outstanding_ci + gsi->cap.max_send_wr) { 421 mlx5_ib_warn(dev, "no available GSI work request.\n"); 422 return -ENOMEM; 423 } 424 425 gsi_wr = &gsi->outstanding_wrs[gsi->outstanding_pi % 426 gsi->cap.max_send_wr]; 427 gsi->outstanding_pi++; 428 429 if (!wc) { 430 memset(&gsi_wr->wc, 0, sizeof(gsi_wr->wc)); 431 gsi_wr->wc.pkey_index = wr->pkey_index; 432 gsi_wr->wc.wr_id = wr->wr.wr_id; 433 } else { 434 gsi_wr->wc = *wc; 435 gsi_wr->completed = true; 436 } 437 438 gsi_wr->cqe.done = &handle_single_completion; 439 wr->wr.wr_cqe = &gsi_wr->cqe; 440 441 return 0; 442 } 443 444 /* Call with gsi->lock locked */ 445 static int mlx5_ib_gsi_silent_drop(struct mlx5_ib_gsi_qp *gsi, 446 struct ib_ud_wr *wr) 447 { 448 struct ib_wc wc = { 449 { .wr_id = wr->wr.wr_id }, 450 .status = IB_WC_SUCCESS, 451 .opcode = IB_WC_SEND, 452 .qp = &gsi->ibqp, 453 }; 454 int ret; 455 456 ret = mlx5_ib_add_outstanding_wr(gsi, wr, &wc); 457 if (ret) 458 return ret; 459 460 generate_completions(gsi); 461 462 return 0; 463 } 464 465 /* Call with gsi->lock locked */ 466 static struct ib_qp *get_tx_qp(struct mlx5_ib_gsi_qp *gsi, struct ib_ud_wr *wr) 467 { 468 struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device); 469 int qp_index = wr->pkey_index; 470 471 if (!mlx5_ib_deth_sqpn_cap(dev)) 472 return gsi->rx_qp; 473 474 if (qp_index >= gsi->num_qps) 475 return NULL; 476 477 return gsi->tx_qps[qp_index]; 478 } 479 480 int mlx5_ib_gsi_post_send(struct ib_qp *qp, const struct ib_send_wr *wr, 481 const struct ib_send_wr **bad_wr) 482 { 483 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp); 484 struct ib_qp *tx_qp; 485 unsigned long flags; 486 int ret; 487 488 for (; wr; wr = wr->next) { 489 struct ib_ud_wr cur_wr = *ud_wr(wr); 490 491 cur_wr.wr.next = NULL; 492 493 spin_lock_irqsave(&gsi->lock, flags); 494 tx_qp = get_tx_qp(gsi, &cur_wr); 495 if (!tx_qp) { 496 ret = mlx5_ib_gsi_silent_drop(gsi, &cur_wr); 497 if (ret) 498 goto err; 499 spin_unlock_irqrestore(&gsi->lock, flags); 500 continue; 501 } 502 503 ret = mlx5_ib_add_outstanding_wr(gsi, &cur_wr, NULL); 504 if (ret) 505 goto err; 506 507 ret = ib_post_send(tx_qp, &cur_wr.wr, bad_wr); 508 if (ret) { 509 /* Undo the effect of adding the outstanding wr */ 510 gsi->outstanding_pi = (gsi->outstanding_pi - 1) % 511 gsi->cap.max_send_wr; 512 goto err; 513 } 514 spin_unlock_irqrestore(&gsi->lock, flags); 515 } 516 517 return 0; 518 519 err: 520 spin_unlock_irqrestore(&gsi->lock, flags); 521 *bad_wr = wr; 522 return ret; 523 } 524 525 int mlx5_ib_gsi_post_recv(struct ib_qp *qp, const struct ib_recv_wr *wr, 526 const struct ib_recv_wr **bad_wr) 527 { 528 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp); 529 530 return ib_post_recv(gsi->rx_qp, wr, bad_wr); 531 } 532 533 void mlx5_ib_gsi_pkey_change(struct mlx5_ib_gsi_qp *gsi) 534 { 535 if (!gsi) 536 return; 537 538 mutex_lock(&gsi->mutex); 539 setup_qps(gsi); 540 mutex_unlock(&gsi->mutex); 541 } 542