drivers/infiniband/hw/mlx5/gsi.c

   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 static u32 next_outstanding(struct mlx5_ib_gsi_qp *gsi, u32 index)
  73 {
  74         return ++index % gsi->cap.max_send_wr;
  75 }
  76
  77 #define for_each_outstanding_wr(gsi, index) \
  78         for (index = gsi->outstanding_ci; index != gsi->outstanding_pi; \
  79              index = next_outstanding(gsi, index))
  80
  81 /* Call with gsi->lock locked */
  82 static void generate_completions(struct mlx5_ib_gsi_qp *gsi)
  83 {
  84         struct ib_cq *gsi_cq = gsi->ibqp.send_cq;
  85         struct mlx5_ib_gsi_wr *wr;
  86         u32 index;
  87
  88         for_each_outstanding_wr(gsi, index) {
  89                 wr = &gsi->outstanding_wrs[index];
  90
  91                 if (!wr->completed)
  92                         break;
  93
  94                 if (gsi->sq_sig_type == IB_SIGNAL_ALL_WR ||
  95                     wr->send_flags & IB_SEND_SIGNALED)
  96                         WARN_ON_ONCE(mlx5_ib_generate_wc(gsi_cq, &wr->wc));
  97
  98                 wr->completed = false;
  99         }
 100
 101         gsi->outstanding_ci = index;
 102 }
 103
 104 static void handle_single_completion(struct ib_cq *cq, struct ib_wc *wc)
 105 {
 106         struct mlx5_ib_gsi_qp *gsi = cq->cq_context;
 107         struct mlx5_ib_gsi_wr *wr =
 108                 container_of(wc->wr_cqe, struct mlx5_ib_gsi_wr, cqe);
 109         u64 wr_id;
 110         unsigned long flags;
 111
 112         spin_lock_irqsave(&gsi->lock, flags);
 113         wr->completed = true;
 114         wr_id = wr->wc.wr_id;
 115         wr->wc = *wc;
 116         wr->wc.wr_id = wr_id;
 117         wr->wc.qp = &gsi->ibqp;
 118
 119         generate_completions(gsi);
 120         spin_unlock_irqrestore(&gsi->lock, flags);
 121 }
 122
 123 struct ib_qp *mlx5_ib_gsi_create_qp(struct ib_pd *pd,
 124                                     struct ib_qp_init_attr *init_attr)
 125 {
 126         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 127         struct mlx5_ib_gsi_qp *gsi;
 128         struct ib_qp_init_attr hw_init_attr = *init_attr;
 129         const u8 port_num = init_attr->port_num;
 130         const int num_pkeys = pd->device->attrs.max_pkeys;
 131         const int num_qps = mlx5_ib_deth_sqpn_cap(dev) ? num_pkeys : 0;
 132         int ret;
 133
 134         mlx5_ib_dbg(dev, "creating GSI QP\n");
 135
 136         if (port_num > ARRAY_SIZE(dev->devr.ports) || port_num < 1) {
 137                 mlx5_ib_warn(dev,
 138                              "invalid port number %d during GSI QP creation\n",
 139                              port_num);
 140                 return ERR_PTR(-EINVAL);
 141         }
 142
 143         gsi = kzalloc(sizeof(*gsi), GFP_KERNEL);
 144         if (!gsi)
 145                 return ERR_PTR(-ENOMEM);
 146
 147         gsi->tx_qps = kcalloc(num_qps, sizeof(*gsi->tx_qps), GFP_KERNEL);
 148         if (!gsi->tx_qps) {
 149                 ret = -ENOMEM;
 150                 goto err_free;
 151         }
 152
 153         gsi->outstanding_wrs = kcalloc(init_attr->cap.max_send_wr,
 154                                        sizeof(*gsi->outstanding_wrs),
 155                                        GFP_KERNEL);
 156         if (!gsi->outstanding_wrs) {
 157                 ret = -ENOMEM;
 158                 goto err_free_tx;
 159         }
 160
 161         mutex_init(&gsi->mutex);
 162
 163         mutex_lock(&dev->devr.mutex);
 164
 165         if (dev->devr.ports[port_num - 1].gsi) {
 166                 mlx5_ib_warn(dev, "GSI QP already exists on port %d\n",
 167                              port_num);
 168                 ret = -EBUSY;
 169                 goto err_free_wrs;
 170         }
 171         gsi->num_qps = num_qps;
 172         spin_lock_init(&gsi->lock);
 173
 174         gsi->cap = init_attr->cap;
 175         gsi->sq_sig_type = init_attr->sq_sig_type;
 176         gsi->ibqp.qp_num = 1;
 177         gsi->port_num = port_num;
 178
 179         gsi->cq = ib_alloc_cq(pd->device, gsi, init_attr->cap.max_send_wr, 0,
 180                               IB_POLL_SOFTIRQ);
 181         if (IS_ERR(gsi->cq)) {
 182                 mlx5_ib_warn(dev, "unable to create send CQ for GSI QP. error %ld\n",
 183                              PTR_ERR(gsi->cq));
 184                 ret = PTR_ERR(gsi->cq);
 185                 goto err_free_wrs;
 186         }
 187
 188         hw_init_attr.qp_type = MLX5_IB_QPT_HW_GSI;
 189         hw_init_attr.send_cq = gsi->cq;
 190         if (num_qps) {
 191                 hw_init_attr.cap.max_send_wr = 0;
 192                 hw_init_attr.cap.max_send_sge = 0;
 193                 hw_init_attr.cap.max_inline_data = 0;
 194         }
 195         gsi->rx_qp = ib_create_qp(pd, &hw_init_attr);
 196         if (IS_ERR(gsi->rx_qp)) {
 197                 mlx5_ib_warn(dev, "unable to create hardware GSI QP. error %ld\n",
 198                              PTR_ERR(gsi->rx_qp));
 199                 ret = PTR_ERR(gsi->rx_qp);
 200                 goto err_destroy_cq;
 201         }
 202
 203         dev->devr.ports[init_attr->port_num - 1].gsi = gsi;
 204
 205         mutex_unlock(&dev->devr.mutex);
 206
 207         return &gsi->ibqp;
 208
 209 err_destroy_cq:
 210         ib_free_cq(gsi->cq);
 211 err_free_wrs:
 212         mutex_unlock(&dev->devr.mutex);
 213         kfree(gsi->outstanding_wrs);
 214 err_free_tx:
 215         kfree(gsi->tx_qps);
 216 err_free:
 217         kfree(gsi);
 218         return ERR_PTR(ret);
 219 }
 220
 221 int mlx5_ib_gsi_destroy_qp(struct ib_qp *qp)
 222 {
 223         struct mlx5_ib_dev *dev = to_mdev(qp->device);
 224         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 225         const int port_num = gsi->port_num;
 226         int qp_index;
 227         int ret;
 228
 229         mlx5_ib_dbg(dev, "destroying GSI QP\n");
 230
 231         mutex_lock(&dev->devr.mutex);
 232         ret = ib_destroy_qp(gsi->rx_qp);
 233         if (ret) {
 234                 mlx5_ib_warn(dev, "unable to destroy hardware GSI QP. error %d\n",
 235                              ret);
 236                 mutex_unlock(&dev->devr.mutex);
 237                 return ret;
 238         }
 239         dev->devr.ports[port_num - 1].gsi = NULL;
 240         mutex_unlock(&dev->devr.mutex);
 241         gsi->rx_qp = NULL;
 242
 243         for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index) {
 244                 if (!gsi->tx_qps[qp_index])
 245                         continue;
 246                 WARN_ON_ONCE(ib_destroy_qp(gsi->tx_qps[qp_index]));
 247                 gsi->tx_qps[qp_index] = NULL;
 248         }
 249
 250         ib_free_cq(gsi->cq);
 251
 252         kfree(gsi->outstanding_wrs);
 253         kfree(gsi->tx_qps);
 254         kfree(gsi);
 255
 256         return 0;
 257 }
 258
 259 static struct ib_qp *create_gsi_ud_qp(struct mlx5_ib_gsi_qp *gsi)
 260 {
 261         struct ib_pd *pd = gsi->rx_qp->pd;
 262         struct ib_qp_init_attr init_attr = {
 263                 .event_handler = gsi->rx_qp->event_handler,
 264                 .qp_context = gsi->rx_qp->qp_context,
 265                 .send_cq = gsi->cq,
 266                 .recv_cq = gsi->rx_qp->recv_cq,
 267                 .cap = {
 268                         .max_send_wr = gsi->cap.max_send_wr,
 269                         .max_send_sge = gsi->cap.max_send_sge,
 270                         .max_inline_data = gsi->cap.max_inline_data,
 271                 },
 272                 .sq_sig_type = gsi->sq_sig_type,
 273                 .qp_type = IB_QPT_UD,
 274                 .create_flags = mlx5_ib_create_qp_sqpn_qp1(),
 275         };
 276
 277         return ib_create_qp(pd, &init_attr);
 278 }
 279
 280 static int modify_to_rts(struct mlx5_ib_gsi_qp *gsi, struct ib_qp *qp,
 281                          u16 qp_index)
 282 {
 283         struct mlx5_ib_dev *dev = to_mdev(qp->device);
 284         struct ib_qp_attr attr;
 285         int mask;
 286         int ret;
 287
 288         mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_QKEY | IB_QP_PORT;
 289         attr.qp_state = IB_QPS_INIT;
 290         attr.pkey_index = qp_index;
 291         attr.qkey = IB_QP1_QKEY;
 292         attr.port_num = gsi->port_num;
 293         ret = ib_modify_qp(qp, &attr, mask);
 294         if (ret) {
 295                 mlx5_ib_err(dev, "could not change QP%d state to INIT: %d\n",
 296                             qp->qp_num, ret);
 297                 return ret;
 298         }
 299
 300         attr.qp_state = IB_QPS_RTR;
 301         ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
 302         if (ret) {
 303                 mlx5_ib_err(dev, "could not change QP%d state to RTR: %d\n",
 304                             qp->qp_num, ret);
 305                 return ret;
 306         }
 307
 308         attr.qp_state = IB_QPS_RTS;
 309         attr.sq_psn = 0;
 310         ret = ib_modify_qp(qp, &attr, IB_QP_STATE | IB_QP_SQ_PSN);
 311         if (ret) {
 312                 mlx5_ib_err(dev, "could not change QP%d state to RTS: %d\n",
 313                             qp->qp_num, ret);
 314                 return ret;
 315         }
 316
 317         return 0;
 318 }
 319
 320 static void setup_qp(struct mlx5_ib_gsi_qp *gsi, u16 qp_index)
 321 {
 322         struct ib_device *device = gsi->rx_qp->device;
 323         struct mlx5_ib_dev *dev = to_mdev(device);
 324         struct ib_qp *qp;
 325         unsigned long flags;
 326         u16 pkey;
 327         int ret;
 328
 329         ret = ib_query_pkey(device, gsi->port_num, qp_index, &pkey);
 330         if (ret) {
 331                 mlx5_ib_warn(dev, "unable to read P_Key at port %d, index %d\n",
 332                              gsi->port_num, qp_index);
 333                 return;
 334         }
 335
 336         if (!pkey) {
 337                 mlx5_ib_dbg(dev, "invalid P_Key at port %d, index %d.  Skipping.\n",
 338                             gsi->port_num, qp_index);
 339                 return;
 340         }
 341
 342         spin_lock_irqsave(&gsi->lock, flags);
 343         qp = gsi->tx_qps[qp_index];
 344         spin_unlock_irqrestore(&gsi->lock, flags);
 345         if (qp) {
 346                 mlx5_ib_dbg(dev, "already existing GSI TX QP at port %d, index %d. Skipping\n",
 347                             gsi->port_num, qp_index);
 348                 return;
 349         }
 350
 351         qp = create_gsi_ud_qp(gsi);
 352         if (IS_ERR(qp)) {
 353                 mlx5_ib_warn(dev, "unable to create hardware UD QP for GSI: %ld\n",
 354                              PTR_ERR(qp));
 355                 return;
 356         }
 357
 358         ret = modify_to_rts(gsi, qp, qp_index);
 359         if (ret)
 360                 goto err_destroy_qp;
 361
 362         spin_lock_irqsave(&gsi->lock, flags);
 363         WARN_ON_ONCE(gsi->tx_qps[qp_index]);
 364         gsi->tx_qps[qp_index] = qp;
 365         spin_unlock_irqrestore(&gsi->lock, flags);
 366
 367         return;
 368
 369 err_destroy_qp:
 370         WARN_ON_ONCE(qp);
 371 }
 372
 373 static void setup_qps(struct mlx5_ib_gsi_qp *gsi)
 374 {
 375         u16 qp_index;
 376
 377         for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index)
 378                 setup_qp(gsi, qp_index);
 379 }
 380
 381 int mlx5_ib_gsi_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
 382                           int attr_mask)
 383 {
 384         struct mlx5_ib_dev *dev = to_mdev(qp->device);
 385         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 386         int ret;
 387
 388         mlx5_ib_dbg(dev, "modifying GSI QP to state %d\n", attr->qp_state);
 389
 390         mutex_lock(&gsi->mutex);
 391         ret = ib_modify_qp(gsi->rx_qp, attr, attr_mask);
 392         if (ret) {
 393                 mlx5_ib_warn(dev, "unable to modify GSI rx QP: %d\n", ret);
 394                 goto unlock;
 395         }
 396
 397         if (to_mqp(gsi->rx_qp)->state == IB_QPS_RTS)
 398                 setup_qps(gsi);
 399
 400 unlock:
 401         mutex_unlock(&gsi->mutex);
 402
 403         return ret;
 404 }
 405
 406 int mlx5_ib_gsi_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr,
 407                          int qp_attr_mask,
 408                          struct ib_qp_init_attr *qp_init_attr)
 409 {
 410         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 411         int ret;
 412
 413         mutex_lock(&gsi->mutex);
 414         ret = ib_query_qp(gsi->rx_qp, qp_attr, qp_attr_mask, qp_init_attr);
 415         qp_init_attr->cap = gsi->cap;
 416         mutex_unlock(&gsi->mutex);
 417
 418         return ret;
 419 }
 420
 421 /* Call with gsi->lock locked */
 422 static int mlx5_ib_add_outstanding_wr(struct mlx5_ib_gsi_qp *gsi,
 423                                       struct ib_ud_wr *wr, struct ib_wc *wc)
 424 {
 425         struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device);
 426         struct mlx5_ib_gsi_wr *gsi_wr;
 427
 428         if (gsi->outstanding_pi == gsi->outstanding_ci + gsi->cap.max_send_wr) {
 429                 mlx5_ib_warn(dev, "no available GSI work request.\n");
 430                 return -ENOMEM;
 431         }
 432
 433         gsi_wr = &gsi->outstanding_wrs[gsi->outstanding_pi];
 434         gsi->outstanding_pi = next_outstanding(gsi, gsi->outstanding_pi);
 435
 436         if (!wc) {
 437                 memset(&gsi_wr->wc, 0, sizeof(gsi_wr->wc));
 438                 gsi_wr->wc.pkey_index = wr->pkey_index;
 439                 gsi_wr->wc.wr_id = wr->wr.wr_id;
 440         } else {
 441                 gsi_wr->wc = *wc;
 442                 gsi_wr->completed = true;
 443         }
 444
 445         gsi_wr->cqe.done = &handle_single_completion;
 446         wr->wr.wr_cqe = &gsi_wr->cqe;
 447
 448         return 0;
 449 }
 450
 451 /* Call with gsi->lock locked */
 452 static int mlx5_ib_gsi_silent_drop(struct mlx5_ib_gsi_qp *gsi,
 453                                     struct ib_ud_wr *wr)
 454 {
 455         struct ib_wc wc = {
 456                 { .wr_id = wr->wr.wr_id },
 457                 .status = IB_WC_SUCCESS,
 458                 .opcode = IB_WC_SEND,
 459                 .qp = &gsi->ibqp,
 460         };
 461         int ret;
 462
 463         ret = mlx5_ib_add_outstanding_wr(gsi, wr, &wc);
 464         if (ret)
 465                 return ret;
 466
 467         generate_completions(gsi);
 468
 469         return 0;
 470 }
 471
 472 /* Call with gsi->lock locked */
 473 static struct ib_qp *get_tx_qp(struct mlx5_ib_gsi_qp *gsi, struct ib_ud_wr *wr)
 474 {
 475         struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device);
 476         int qp_index = wr->pkey_index;
 477
 478         if (!mlx5_ib_deth_sqpn_cap(dev))
 479                 return gsi->rx_qp;
 480
 481         if (qp_index >= gsi->num_qps)
 482                 return NULL;
 483
 484         return gsi->tx_qps[qp_index];
 485 }
 486
 487 int mlx5_ib_gsi_post_send(struct ib_qp *qp, struct ib_send_wr *wr,
 488                           struct ib_send_wr **bad_wr)
 489 {
 490         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 491         struct ib_qp *tx_qp;
 492         unsigned long flags;
 493         int ret;
 494
 495         for (; wr; wr = wr->next) {
 496                 struct ib_ud_wr cur_wr = *ud_wr(wr);
 497
 498                 cur_wr.wr.next = NULL;
 499
 500                 spin_lock_irqsave(&gsi->lock, flags);
 501                 tx_qp = get_tx_qp(gsi, &cur_wr);
 502                 if (!tx_qp) {
 503                         ret = mlx5_ib_gsi_silent_drop(gsi, &cur_wr);
 504                         if (ret)
 505                                 goto err;
 506                         spin_unlock_irqrestore(&gsi->lock, flags);
 507                         continue;
 508                 }
 509
 510                 ret = mlx5_ib_add_outstanding_wr(gsi, &cur_wr, NULL);
 511                 if (ret)
 512                         goto err;
 513
 514                 ret = ib_post_send(tx_qp, &cur_wr.wr, bad_wr);
 515                 if (ret) {
 516                         /* Undo the effect of adding the outstanding wr */
 517                         gsi->outstanding_pi = (gsi->outstanding_pi - 1) %
 518                                               gsi->cap.max_send_wr;
 519                         goto err;
 520                 }
 521                 spin_unlock_irqrestore(&gsi->lock, flags);
 522         }
 523
 524         return 0;
 525
 526 err:
 527         spin_unlock_irqrestore(&gsi->lock, flags);
 528         *bad_wr = wr;
 529         return ret;
 530 }
 531
 532 int mlx5_ib_gsi_post_recv(struct ib_qp *qp, struct ib_recv_wr *wr,
 533                           struct ib_recv_wr **bad_wr)
 534 {
 535         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 536
 537         return ib_post_recv(gsi->rx_qp, wr, bad_wr);
 538 }
 539
 540 void mlx5_ib_gsi_pkey_change(struct mlx5_ib_gsi_qp *gsi)
 541 {
 542         if (!gsi)
 543                 return;
 544
 545         mutex_lock(&gsi->mutex);
 546         setup_qps(gsi);
 547         mutex_unlock(&gsi->mutex);
 548 }