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 /* 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_QP_CREATE_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--;
 511                         goto err;
 512                 }
 513                 spin_unlock_irqrestore(&gsi->lock, flags);
 514         }
 515
 516         return 0;
 517
 518 err:
 519         spin_unlock_irqrestore(&gsi->lock, flags);
 520         *bad_wr = wr;
 521         return ret;
 522 }
 523
 524 int mlx5_ib_gsi_post_recv(struct ib_qp *qp, const struct ib_recv_wr *wr,
 525                           const struct ib_recv_wr **bad_wr)
 526 {
 527         struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
 528
 529         return ib_post_recv(gsi->rx_qp, wr, bad_wr);
 530 }
 531
 532 void mlx5_ib_gsi_pkey_change(struct mlx5_ib_gsi_qp *gsi)
 533 {
 534         if (!gsi)
 535                 return;
 536
 537         mutex_lock(&gsi->mutex);
 538         setup_qps(gsi);
 539         mutex_unlock(&gsi->mutex);
 540 }