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
 163         err = mlx5_db_alloc(dev->mdev, &srq->db);
 164         if (err) {
 165                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 166                 return err;
 167         }
 168
 169         if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) {
 170                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 171                 err = -ENOMEM;
 172                 goto err_db;
 173         }
 174
 175         srq->head    = 0;
 176         srq->tail    = srq->msrq.max - 1;
 177         srq->wqe_ctr = 0;
 178
 179         for (i = 0; i < srq->msrq.max; i++) {
 180                 next = get_wqe(srq, i);
 181                 next->next_wqe_index =
 182                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 183         }
 184
 185         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
 186         in->pas = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages);
 187         if (!in->pas) {
 188                 err = -ENOMEM;
 189                 goto err_buf;
 190         }
 191         mlx5_fill_page_array(&srq->buf, in->pas);
 192
 193         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 194         if (!srq->wrid) {
 195                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 196                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 197                 err = -ENOMEM;
 198                 goto err_in;
 199         }
 200         srq->wq_sig = !!srq_signature;
 201
 202         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 203         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 204             in->type == IB_SRQT_XRC)
 205                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 206
 207         return 0;
 208
 209 err_in:
 210         kvfree(in->pas);
 211
 212 err_buf:
 213         mlx5_buf_free(dev->mdev, &srq->buf);
 214
 215 err_db:
 216         mlx5_db_free(dev->mdev, &srq->db);
 217         return err;
 218 }
 219
 220 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 221 {
 222         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 223         ib_umem_release(srq->umem);
 224 }
 225
 226
 227 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 228 {
 229         kfree(srq->wrid);
 230         mlx5_buf_free(dev->mdev, &srq->buf);
 231         mlx5_db_free(dev->mdev, &srq->db);
 232 }
 233
 234 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 235                                   struct ib_srq_init_attr *init_attr,
 236                                   struct ib_udata *udata)
 237 {
 238         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 239         struct mlx5_ib_srq *srq;
 240         size_t desc_size;
 241         size_t buf_size;
 242         int err;
 243         struct mlx5_srq_attr in = {0};
 244         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 245
 246         /* Sanity check SRQ size before proceeding */
 247         if (init_attr->attr.max_wr >= max_srq_wqes) {
 248                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 249                             init_attr->attr.max_wr,
 250                             max_srq_wqes);
 251                 return ERR_PTR(-EINVAL);
 252         }
 253
 254         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 255         if (!srq)
 256                 return ERR_PTR(-ENOMEM);
 257
 258         mutex_init(&srq->mutex);
 259         spin_lock_init(&srq->lock);
 260         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 261         srq->msrq.max_gs = init_attr->attr.max_sge;
 262
 263         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 264                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 265         if (desc_size == 0 || srq->msrq.max_gs > desc_size) {
 266                 err = -EINVAL;
 267                 goto err_srq;
 268         }
 269         desc_size = roundup_pow_of_two(desc_size);
 270         desc_size = max_t(size_t, 32, desc_size);
 271         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) {
 272                 err = -EINVAL;
 273                 goto err_srq;
 274         }
 275         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 276                 sizeof(struct mlx5_wqe_data_seg);
 277         srq->msrq.wqe_shift = ilog2(desc_size);
 278         buf_size = srq->msrq.max * desc_size;
 279         if (buf_size < desc_size) {
 280                 err = -EINVAL;
 281                 goto err_srq;
 282         }
 283         in.type = init_attr->srq_type;
 284
 285         if (pd->uobject)
 286                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 287         else
 288                 err = create_srq_kernel(dev, srq, &in, buf_size);
 289
 290         if (err || !in.pas) {
 291                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 292                              pd->uobject ? "user" : "kernel", err);
 293                 goto err_srq;
 294         }
 295
 296         in.log_size = ilog2(srq->msrq.max);
 297         in.wqe_shift = srq->msrq.wqe_shift - 4;
 298         if (srq->wq_sig)
 299                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 300         if (init_attr->srq_type == IB_SRQT_XRC) {
 301                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 302                 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
 303         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 304                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 305                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 306         }
 307
 308         in.pd = to_mpd(pd)->pdn;
 309         in.db_record = srq->db.dma;
 310         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
 311         kvfree(in.pas);
 312         if (err) {
 313                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 314                 goto err_usr_kern_srq;
 315         }
 316
 317         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 318
 319         srq->msrq.event = mlx5_ib_srq_event;
 320         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 321
 322         if (pd->uobject)
 323                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 324                         mlx5_ib_dbg(dev, "copy to user failed\n");
 325                         err = -EFAULT;
 326                         goto err_core;
 327                 }
 328
 329         init_attr->attr.max_wr = srq->msrq.max - 1;
 330
 331         return &srq->ibsrq;
 332
 333 err_core:
 334         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 335
 336 err_usr_kern_srq:
 337         if (pd->uobject)
 338                 destroy_srq_user(pd, srq);
 339         else
 340                 destroy_srq_kernel(dev, srq);
 341
 342 err_srq:
 343         kfree(srq);
 344
 345         return ERR_PTR(err);
 346 }
 347
 348 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 349                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 350 {
 351         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 352         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 353         int ret;
 354
 355         /* We don't support resizing SRQs yet */
 356         if (attr_mask & IB_SRQ_MAX_WR)
 357                 return -EINVAL;
 358
 359         if (attr_mask & IB_SRQ_LIMIT) {
 360                 if (attr->srq_limit >= srq->msrq.max)
 361                         return -EINVAL;
 362
 363                 mutex_lock(&srq->mutex);
 364                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 365                 mutex_unlock(&srq->mutex);
 366
 367                 if (ret)
 368                         return ret;
 369         }
 370
 371         return 0;
 372 }
 373
 374 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 375 {
 376         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 377         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 378         int ret;
 379         struct mlx5_srq_attr *out;
 380
 381         out = kzalloc(sizeof(*out), GFP_KERNEL);
 382         if (!out)
 383                 return -ENOMEM;
 384
 385         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 386         if (ret)
 387                 goto out_box;
 388
 389         srq_attr->srq_limit = out->lwm;
 390         srq_attr->max_wr    = srq->msrq.max - 1;
 391         srq_attr->max_sge   = srq->msrq.max_gs;
 392
 393 out_box:
 394         kfree(out);
 395         return ret;
 396 }
 397
 398 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 399 {
 400         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 401         struct mlx5_ib_srq *msrq = to_msrq(srq);
 402
 403         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 404
 405         if (srq->uobject) {
 406                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 407                 ib_umem_release(msrq->umem);
 408         } else {
 409                 destroy_srq_kernel(dev, msrq);
 410         }
 411
 412         kfree(srq);
 413         return 0;
 414 }
 415
 416 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 417 {
 418         struct mlx5_wqe_srq_next_seg *next;
 419
 420         /* always called with interrupts disabled. */
 421         spin_lock(&srq->lock);
 422
 423         next = get_wqe(srq, srq->tail);
 424         next->next_wqe_index = cpu_to_be16(wqe_index);
 425         srq->tail = wqe_index;
 426
 427         spin_unlock(&srq->lock);
 428 }
 429
 430 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 431                           struct ib_recv_wr **bad_wr)
 432 {
 433         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 434         struct mlx5_wqe_srq_next_seg *next;
 435         struct mlx5_wqe_data_seg *scat;
 436         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 437         struct mlx5_core_dev *mdev = dev->mdev;
 438         unsigned long flags;
 439         int err = 0;
 440         int nreq;
 441         int i;
 442
 443         spin_lock_irqsave(&srq->lock, flags);
 444
 445         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 446                 err = -EIO;
 447                 *bad_wr = wr;
 448                 goto out;
 449         }
 450
 451         for (nreq = 0; wr; nreq++, wr = wr->next) {
 452                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 453                         err = -EINVAL;
 454                         *bad_wr = wr;
 455                         break;
 456                 }
 457
 458                 if (unlikely(srq->head == srq->tail)) {
 459                         err = -ENOMEM;
 460                         *bad_wr = wr;
 461                         break;
 462                 }
 463
 464                 srq->wrid[srq->head] = wr->wr_id;
 465
 466                 next      = get_wqe(srq, srq->head);
 467                 srq->head = be16_to_cpu(next->next_wqe_index);
 468                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 469
 470                 for (i = 0; i < wr->num_sge; i++) {
 471                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 472                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 473                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 474                 }
 475
 476                 if (i < srq->msrq.max_avail_gather) {
 477                         scat[i].byte_count = 0;
 478                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 479                         scat[i].addr       = 0;
 480                 }
 481         }
 482
 483         if (likely(nreq)) {
 484                 srq->wqe_ctr += nreq;
 485
 486                 /* Make sure that descriptors are written before
 487                  * doorbell record.
 488                  */
 489                 wmb();
 490
 491                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 492         }
 493 out:
 494         spin_unlock_irqrestore(&srq->lock, flags);
 495
 496         return err;
 497 }