sys/dev/mlx5/mlx5_ib/mlx5_ib_srq.c

   1 /*-
   2  * Copyright (c) 2013-2015, Mellanox Technologies, Ltd.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $FreeBSD$
  26  */
  27
  28 #include <linux/module.h>
  29 #include <dev/mlx5/qp.h>
  30 #include <dev/mlx5/srq.h>
  31 #include <linux/slab.h>
  32 #include <rdma/ib_umem.h>
  33 #include <rdma/ib_user_verbs.h>
  34
  35 #include "mlx5_ib.h"
  36
  37 /* not supported currently */
  38 static int srq_signature;
  39
  40 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
  41 {
  42         return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  43 }
  44
  45 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, int type)
  46 {
  47         struct ib_event event;
  48         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  49
  50         if (ibsrq->event_handler) {
  51                 event.device      = ibsrq->device;
  52                 event.element.srq = ibsrq;
  53                 switch (type) {
  54                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
  55                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  56                         break;
  57                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
  58                         event.event = IB_EVENT_SRQ_ERR;
  59                         break;
  60                 default:
  61                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
  62                                 type, srq->srqn);
  63                         return;
  64                 }
  65
  66                 ibsrq->event_handler(&event, ibsrq->srq_context);
  67         }
  68 }
  69
  70 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  71                            struct mlx5_srq_attr *in,
  72                            struct ib_udata *udata, int buf_size)
  73 {
  74         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  75         struct mlx5_ib_create_srq ucmd = {};
  76         size_t ucmdlen;
  77         int err;
  78         int npages;
  79         int page_shift;
  80         int ncont;
  81         u32 offset;
  82         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  83
  84         ucmdlen = min(udata->inlen, sizeof(ucmd));
  85
  86         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  87                 mlx5_ib_dbg(dev, "failed copy udata\n");
  88                 return -EFAULT;
  89         }
  90
  91         if (ucmd.reserved0 || ucmd.reserved1)
  92                 return -EINVAL;
  93
  94         if (udata->inlen > sizeof(ucmd) &&
  95             !ib_is_udata_cleared(udata, sizeof(ucmd),
  96                                  udata->inlen - sizeof(ucmd)))
  97                 return -EINVAL;
  98
  99         if (in->type == IB_SRQT_XRC) {
 100                 err = get_srq_user_index(to_mucontext(pd->uobject->context),
 101                                          &ucmd, udata->inlen, &uidx);
 102                 if (err)
 103                         return err;
 104         }
 105
 106         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 107
 108         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 109                                 0, 0);
 110         if (IS_ERR(srq->umem)) {
 111                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 112                 err = PTR_ERR(srq->umem);
 113                 return err;
 114         }
 115
 116         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 117                            &page_shift, &ncont, NULL);
 118         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 119                                      &offset);
 120         if (err) {
 121                 mlx5_ib_warn(dev, "bad offset\n");
 122                 goto err_umem;
 123         }
 124
 125         in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont);
 126         if (!in->pas) {
 127                 err = -ENOMEM;
 128                 goto err_umem;
 129         }
 130
 131         mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
 132
 133         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 134                                   ucmd.db_addr, &srq->db);
 135         if (err) {
 136                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 137                 goto err_in;
 138         }
 139
 140         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 141         in->page_offset = offset;
 142         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 143             in->type == IB_SRQT_XRC)
 144                 in->user_index = uidx;
 145         return 0;
 146
 147 err_in:
 148         kvfree(in->pas);
 149
 150 err_umem:
 151         ib_umem_release(srq->umem);
 152
 153         return err;
 154 }
 155
 156 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 157                              struct mlx5_srq_attr *in, int buf_size)
 158 {
 159         int err;
 160         int i;
 161         struct mlx5_wqe_srq_next_seg *next;
 162         int page_shift;
 163         int npages;
 164
 165         err = mlx5_db_alloc(dev->mdev, &srq->db);
 166         if (err) {
 167                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 168                 return err;
 169         }
 170
 171         if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) {
 172                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 173                 err = -ENOMEM;
 174                 goto err_db;
 175         }
 176         page_shift = srq->buf.page_shift;
 177
 178         srq->head    = 0;
 179         srq->tail    = srq->msrq.max - 1;
 180         srq->wqe_ctr = 0;
 181
 182         for (i = 0; i < srq->msrq.max; i++) {
 183                 next = get_wqe(srq, i);
 184                 next->next_wqe_index =
 185                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 186         }
 187
 188         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 189         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 190                     buf_size, page_shift, srq->buf.npages, npages);
 191         in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
 192         if (!in->pas) {
 193                 err = -ENOMEM;
 194                 goto err_buf;
 195         }
 196         mlx5_fill_page_array(&srq->buf, in->pas);
 197
 198         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 199         if (!srq->wrid) {
 200                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 201                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 202                 err = -ENOMEM;
 203                 goto err_in;
 204         }
 205         srq->wq_sig = !!srq_signature;
 206
 207         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 208         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 209             in->type == IB_SRQT_XRC)
 210                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 211
 212         return 0;
 213
 214 err_in:
 215         kvfree(in->pas);
 216
 217 err_buf:
 218         mlx5_buf_free(dev->mdev, &srq->buf);
 219
 220 err_db:
 221         mlx5_db_free(dev->mdev, &srq->db);
 222         return err;
 223 }
 224
 225 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 226 {
 227         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 228         ib_umem_release(srq->umem);
 229 }
 230
 231
 232 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 233 {
 234         kfree(srq->wrid);
 235         mlx5_buf_free(dev->mdev, &srq->buf);
 236         mlx5_db_free(dev->mdev, &srq->db);
 237 }
 238
 239 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 240                                   struct ib_srq_init_attr *init_attr,
 241                                   struct ib_udata *udata)
 242 {
 243         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 244         struct mlx5_ib_srq *srq;
 245         int desc_size;
 246         int buf_size;
 247         int err;
 248         struct mlx5_srq_attr in = {0};
 249         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 250
 251         /* Sanity check SRQ size before proceeding */
 252         if (init_attr->attr.max_wr >= max_srq_wqes) {
 253                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 254                             init_attr->attr.max_wr,
 255                             max_srq_wqes);
 256                 return ERR_PTR(-EINVAL);
 257         }
 258
 259         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 260         if (!srq)
 261                 return ERR_PTR(-ENOMEM);
 262
 263         mutex_init(&srq->mutex);
 264         spin_lock_init(&srq->lock);
 265         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 266         srq->msrq.max_gs = init_attr->attr.max_sge;
 267
 268         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 269                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 270         desc_size = roundup_pow_of_two(desc_size);
 271         desc_size = max_t(int, 32, desc_size);
 272         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 273                 sizeof(struct mlx5_wqe_data_seg);
 274         srq->msrq.wqe_shift = ilog2(desc_size);
 275         buf_size = srq->msrq.max * desc_size;
 276         mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n",
 277                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 278                     srq->msrq.max_avail_gather);
 279
 280         if (pd->uobject)
 281                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 282         else
 283                 err = create_srq_kernel(dev, srq, &in, buf_size);
 284
 285         if (err) {
 286                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 287                              pd->uobject ? "user" : "kernel", err);
 288                 goto err_srq;
 289         }
 290
 291         in.type = init_attr->srq_type;
 292         in.log_size = ilog2(srq->msrq.max);
 293         in.wqe_shift = srq->msrq.wqe_shift - 4;
 294         if (srq->wq_sig)
 295                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 296         if (init_attr->srq_type == IB_SRQT_XRC) {
 297                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 298                 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
 299         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 300                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 301                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 302         }
 303
 304         in.pd = to_mpd(pd)->pdn;
 305         in.db_record = srq->db.dma;
 306         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
 307         kvfree(in.pas);
 308         if (err) {
 309                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 310                 goto err_usr_kern_srq;
 311         }
 312
 313         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 314
 315         srq->msrq.event = mlx5_ib_srq_event;
 316         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 317
 318         if (pd->uobject)
 319                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 320                         mlx5_ib_dbg(dev, "copy to user failed\n");
 321                         err = -EFAULT;
 322                         goto err_core;
 323                 }
 324
 325         init_attr->attr.max_wr = srq->msrq.max - 1;
 326
 327         return &srq->ibsrq;
 328
 329 err_core:
 330         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 331
 332 err_usr_kern_srq:
 333         if (pd->uobject)
 334                 destroy_srq_user(pd, srq);
 335         else
 336                 destroy_srq_kernel(dev, srq);
 337
 338 err_srq:
 339         kfree(srq);
 340
 341         return ERR_PTR(err);
 342 }
 343
 344 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 345                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 346 {
 347         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 348         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 349         int ret;
 350
 351         /* We don't support resizing SRQs yet */
 352         if (attr_mask & IB_SRQ_MAX_WR)
 353                 return -EINVAL;
 354
 355         if (attr_mask & IB_SRQ_LIMIT) {
 356                 if (attr->srq_limit >= srq->msrq.max)
 357                         return -EINVAL;
 358
 359                 mutex_lock(&srq->mutex);
 360                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 361                 mutex_unlock(&srq->mutex);
 362
 363                 if (ret)
 364                         return ret;
 365         }
 366
 367         return 0;
 368 }
 369
 370 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 371 {
 372         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 373         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 374         int ret;
 375         struct mlx5_srq_attr *out;
 376
 377         out = kzalloc(sizeof(*out), GFP_KERNEL);
 378         if (!out)
 379                 return -ENOMEM;
 380
 381         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 382         if (ret)
 383                 goto out_box;
 384
 385         srq_attr->srq_limit = out->lwm;
 386         srq_attr->max_wr    = srq->msrq.max - 1;
 387         srq_attr->max_sge   = srq->msrq.max_gs;
 388
 389 out_box:
 390         kfree(out);
 391         return ret;
 392 }
 393
 394 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 395 {
 396         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 397         struct mlx5_ib_srq *msrq = to_msrq(srq);
 398
 399         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 400
 401         if (srq->uobject) {
 402                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 403                 ib_umem_release(msrq->umem);
 404         } else {
 405                 destroy_srq_kernel(dev, msrq);
 406         }
 407
 408         kfree(srq);
 409         return 0;
 410 }
 411
 412 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 413 {
 414         struct mlx5_wqe_srq_next_seg *next;
 415
 416         /* always called with interrupts disabled. */
 417         spin_lock(&srq->lock);
 418
 419         next = get_wqe(srq, srq->tail);
 420         next->next_wqe_index = cpu_to_be16(wqe_index);
 421         srq->tail = wqe_index;
 422
 423         spin_unlock(&srq->lock);
 424 }
 425
 426 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 427                           struct ib_recv_wr **bad_wr)
 428 {
 429         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 430         struct mlx5_wqe_srq_next_seg *next;
 431         struct mlx5_wqe_data_seg *scat;
 432         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 433         struct mlx5_core_dev *mdev = dev->mdev;
 434         unsigned long flags;
 435         int err = 0;
 436         int nreq;
 437         int i;
 438
 439         spin_lock_irqsave(&srq->lock, flags);
 440
 441         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 442                 err = -EIO;
 443                 *bad_wr = wr;
 444                 goto out;
 445         }
 446
 447         for (nreq = 0; wr; nreq++, wr = wr->next) {
 448                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 449                         err = -EINVAL;
 450                         *bad_wr = wr;
 451                         break;
 452                 }
 453
 454                 if (unlikely(srq->head == srq->tail)) {
 455                         err = -ENOMEM;
 456                         *bad_wr = wr;
 457                         break;
 458                 }
 459
 460                 srq->wrid[srq->head] = wr->wr_id;
 461
 462                 next      = get_wqe(srq, srq->head);
 463                 srq->head = be16_to_cpu(next->next_wqe_index);
 464                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 465
 466                 for (i = 0; i < wr->num_sge; i++) {
 467                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 468                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 469                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 470                 }
 471
 472                 if (i < srq->msrq.max_avail_gather) {
 473                         scat[i].byte_count = 0;
 474                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 475                         scat[i].addr       = 0;
 476                 }
 477         }
 478
 479         if (likely(nreq)) {
 480                 srq->wqe_ctr += nreq;
 481
 482                 /* Make sure that descriptors are written before
 483                  * doorbell record.
 484                  */
 485                 wmb();
 486
 487                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 488         }
 489 out:
 490         spin_unlock_irqrestore(&srq->lock, flags);
 491
 492         return err;
 493 }