drivers/infiniband/hw/mlx5/srq.c

   1 /*
   2  * Copyright (c) 2013-2015, 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 <linux/module.h>
  34 #include <linux/mlx5/qp.h>
  35 #include <linux/mlx5/srq.h>
  36 #include <linux/slab.h>
  37 #include <rdma/ib_umem.h>
  38 #include <rdma/ib_user_verbs.h>
  39
  40 #include "mlx5_ib.h"
  41 #include "user.h"
  42
  43 /* not supported currently */
  44 static int srq_signature;
  45
  46 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
  47 {
  48         return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  49 }
  50
  51 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
  52 {
  53         struct ib_event event;
  54         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  55
  56         if (ibsrq->event_handler) {
  57                 event.device      = ibsrq->device;
  58                 event.element.srq = ibsrq;
  59                 switch (type) {
  60                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
  61                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  62                         break;
  63                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
  64                         event.event = IB_EVENT_SRQ_ERR;
  65                         break;
  66                 default:
  67                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
  68                                 type, srq->srqn);
  69                         return;
  70                 }
  71
  72                 ibsrq->event_handler(&event, ibsrq->srq_context);
  73         }
  74 }
  75
  76 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  77                            struct mlx5_srq_attr *in,
  78                            struct ib_udata *udata, int buf_size)
  79 {
  80         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  81         struct mlx5_ib_create_srq ucmd = {};
  82         size_t ucmdlen;
  83         int err;
  84         int npages;
  85         int page_shift;
  86         int ncont;
  87         u32 offset;
  88         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  89
  90         ucmdlen = min(udata->inlen, sizeof(ucmd));
  91
  92         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  93                 mlx5_ib_dbg(dev, "failed copy udata\n");
  94                 return -EFAULT;
  95         }
  96
  97         if (ucmd.reserved0 || ucmd.reserved1)
  98                 return -EINVAL;
  99
 100         if (udata->inlen > sizeof(ucmd) &&
 101             !ib_is_udata_cleared(udata, sizeof(ucmd),
 102                                  udata->inlen - sizeof(ucmd)))
 103                 return -EINVAL;
 104
 105         if (in->type == IB_SRQT_XRC) {
 106                 err = get_srq_user_index(to_mucontext(pd->uobject->context),
 107                                          &ucmd, udata->inlen, &uidx);
 108                 if (err)
 109                         return err;
 110         }
 111
 112         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 113
 114         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 115                                 0, 0);
 116         if (IS_ERR(srq->umem)) {
 117                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 118                 err = PTR_ERR(srq->umem);
 119                 return err;
 120         }
 121
 122         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 123                            &page_shift, &ncont, NULL);
 124         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 125                                      &offset);
 126         if (err) {
 127                 mlx5_ib_warn(dev, "bad offset\n");
 128                 goto err_umem;
 129         }
 130
 131         in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont);
 132         if (!in->pas) {
 133                 err = -ENOMEM;
 134                 goto err_umem;
 135         }
 136
 137         mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
 138
 139         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 140                                   ucmd.db_addr, &srq->db);
 141         if (err) {
 142                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 143                 goto err_in;
 144         }
 145
 146         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 147         in->page_offset = offset;
 148         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 149             in->type == IB_SRQT_XRC)
 150                 in->user_index = uidx;
 151
 152         return 0;
 153
 154 err_in:
 155         kvfree(in->pas);
 156
 157 err_umem:
 158         ib_umem_release(srq->umem);
 159
 160         return err;
 161 }
 162
 163 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 164                              struct mlx5_srq_attr *in, int buf_size)
 165 {
 166         int err;
 167         int i;
 168         struct mlx5_wqe_srq_next_seg *next;
 169         int page_shift;
 170         int npages;
 171
 172         err = mlx5_db_alloc(dev->mdev, &srq->db);
 173         if (err) {
 174                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 175                 return err;
 176         }
 177
 178         if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
 179                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 180                 err = -ENOMEM;
 181                 goto err_db;
 182         }
 183         page_shift = srq->buf.page_shift;
 184
 185         srq->head    = 0;
 186         srq->tail    = srq->msrq.max - 1;
 187         srq->wqe_ctr = 0;
 188
 189         for (i = 0; i < srq->msrq.max; i++) {
 190                 next = get_wqe(srq, i);
 191                 next->next_wqe_index =
 192                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 193         }
 194
 195         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 196         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 197                     buf_size, page_shift, srq->buf.npages, npages);
 198         in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
 199         if (!in->pas) {
 200                 err = -ENOMEM;
 201                 goto err_buf;
 202         }
 203         mlx5_fill_page_array(&srq->buf, in->pas);
 204
 205         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 206         if (!srq->wrid) {
 207                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 208                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 209                 err = -ENOMEM;
 210                 goto err_in;
 211         }
 212         srq->wq_sig = !!srq_signature;
 213
 214         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 215         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 216             in->type == IB_SRQT_XRC)
 217                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 218
 219         return 0;
 220
 221 err_in:
 222         kvfree(in->pas);
 223
 224 err_buf:
 225         mlx5_buf_free(dev->mdev, &srq->buf);
 226
 227 err_db:
 228         mlx5_db_free(dev->mdev, &srq->db);
 229         return err;
 230 }
 231
 232 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 233 {
 234         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 235         ib_umem_release(srq->umem);
 236 }
 237
 238
 239 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 240 {
 241         kfree(srq->wrid);
 242         mlx5_buf_free(dev->mdev, &srq->buf);
 243         mlx5_db_free(dev->mdev, &srq->db);
 244 }
 245
 246 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 247                                   struct ib_srq_init_attr *init_attr,
 248                                   struct ib_udata *udata)
 249 {
 250         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 251         struct mlx5_ib_srq *srq;
 252         int desc_size;
 253         int buf_size;
 254         int err;
 255         struct mlx5_srq_attr in = {0};
 256         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 257
 258         /* Sanity check SRQ size before proceeding */
 259         if (init_attr->attr.max_wr >= max_srq_wqes) {
 260                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 261                             init_attr->attr.max_wr,
 262                             max_srq_wqes);
 263                 return ERR_PTR(-EINVAL);
 264         }
 265
 266         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 267         if (!srq)
 268                 return ERR_PTR(-ENOMEM);
 269
 270         mutex_init(&srq->mutex);
 271         spin_lock_init(&srq->lock);
 272         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 273         srq->msrq.max_gs = init_attr->attr.max_sge;
 274
 275         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 276                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 277         desc_size = roundup_pow_of_two(desc_size);
 278         desc_size = max_t(int, 32, desc_size);
 279         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 280                 sizeof(struct mlx5_wqe_data_seg);
 281         srq->msrq.wqe_shift = ilog2(desc_size);
 282         buf_size = srq->msrq.max * desc_size;
 283         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",
 284                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 285                     srq->msrq.max_avail_gather);
 286
 287         if (pd->uobject)
 288                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 289         else
 290                 err = create_srq_kernel(dev, srq, &in, buf_size);
 291
 292         if (err) {
 293                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 294                              pd->uobject ? "user" : "kernel", err);
 295                 goto err_srq;
 296         }
 297
 298         in.type = init_attr->srq_type;
 299         in.log_size = ilog2(srq->msrq.max);
 300         in.wqe_shift = srq->msrq.wqe_shift - 4;
 301         if (srq->wq_sig)
 302                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 303         if (init_attr->srq_type == IB_SRQT_XRC) {
 304                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 305                 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
 306         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 307                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 308                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 309         }
 310
 311         in.pd = to_mpd(pd)->pdn;
 312         in.db_record = srq->db.dma;
 313         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
 314         kvfree(in.pas);
 315         if (err) {
 316                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 317                 goto err_usr_kern_srq;
 318         }
 319
 320         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 321
 322         srq->msrq.event = mlx5_ib_srq_event;
 323         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 324
 325         if (pd->uobject)
 326                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 327                         mlx5_ib_dbg(dev, "copy to user failed\n");
 328                         err = -EFAULT;
 329                         goto err_core;
 330                 }
 331
 332         init_attr->attr.max_wr = srq->msrq.max - 1;
 333
 334         return &srq->ibsrq;
 335
 336 err_core:
 337         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 338
 339 err_usr_kern_srq:
 340         if (pd->uobject)
 341                 destroy_srq_user(pd, srq);
 342         else
 343                 destroy_srq_kernel(dev, srq);
 344
 345 err_srq:
 346         kfree(srq);
 347
 348         return ERR_PTR(err);
 349 }
 350
 351 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 352                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 353 {
 354         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 355         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 356         int ret;
 357
 358         /* We don't support resizing SRQs yet */
 359         if (attr_mask & IB_SRQ_MAX_WR)
 360                 return -EINVAL;
 361
 362         if (attr_mask & IB_SRQ_LIMIT) {
 363                 if (attr->srq_limit >= srq->msrq.max)
 364                         return -EINVAL;
 365
 366                 mutex_lock(&srq->mutex);
 367                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 368                 mutex_unlock(&srq->mutex);
 369
 370                 if (ret)
 371                         return ret;
 372         }
 373
 374         return 0;
 375 }
 376
 377 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 378 {
 379         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 380         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 381         int ret;
 382         struct mlx5_srq_attr *out;
 383
 384         out = kzalloc(sizeof(*out), GFP_KERNEL);
 385         if (!out)
 386                 return -ENOMEM;
 387
 388         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 389         if (ret)
 390                 goto out_box;
 391
 392         srq_attr->srq_limit = out->lwm;
 393         srq_attr->max_wr    = srq->msrq.max - 1;
 394         srq_attr->max_sge   = srq->msrq.max_gs;
 395
 396 out_box:
 397         kfree(out);
 398         return ret;
 399 }
 400
 401 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 402 {
 403         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 404         struct mlx5_ib_srq *msrq = to_msrq(srq);
 405
 406         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 407
 408         if (srq->uobject) {
 409                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 410                 ib_umem_release(msrq->umem);
 411         } else {
 412                 destroy_srq_kernel(dev, msrq);
 413         }
 414
 415         kfree(srq);
 416         return 0;
 417 }
 418
 419 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 420 {
 421         struct mlx5_wqe_srq_next_seg *next;
 422
 423         /* always called with interrupts disabled. */
 424         spin_lock(&srq->lock);
 425
 426         next = get_wqe(srq, srq->tail);
 427         next->next_wqe_index = cpu_to_be16(wqe_index);
 428         srq->tail = wqe_index;
 429
 430         spin_unlock(&srq->lock);
 431 }
 432
 433 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 434                           struct ib_recv_wr **bad_wr)
 435 {
 436         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 437         struct mlx5_wqe_srq_next_seg *next;
 438         struct mlx5_wqe_data_seg *scat;
 439         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 440         struct mlx5_core_dev *mdev = dev->mdev;
 441         unsigned long flags;
 442         int err = 0;
 443         int nreq;
 444         int i;
 445
 446         spin_lock_irqsave(&srq->lock, flags);
 447
 448         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 449                 err = -EIO;
 450                 *bad_wr = wr;
 451                 goto out;
 452         }
 453
 454         for (nreq = 0; wr; nreq++, wr = wr->next) {
 455                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 456                         err = -EINVAL;
 457                         *bad_wr = wr;
 458                         break;
 459                 }
 460
 461                 if (unlikely(srq->head == srq->tail)) {
 462                         err = -ENOMEM;
 463                         *bad_wr = wr;
 464                         break;
 465                 }
 466
 467                 srq->wrid[srq->head] = wr->wr_id;
 468
 469                 next      = get_wqe(srq, srq->head);
 470                 srq->head = be16_to_cpu(next->next_wqe_index);
 471                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 472
 473                 for (i = 0; i < wr->num_sge; i++) {
 474                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 475                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 476                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 477                 }
 478
 479                 if (i < srq->msrq.max_avail_gather) {
 480                         scat[i].byte_count = 0;
 481                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 482                         scat[i].addr       = 0;
 483                 }
 484         }
 485
 486         if (likely(nreq)) {
 487                 srq->wqe_ctr += nreq;
 488
 489                 /* Make sure that descriptors are written before
 490                  * doorbell record.
 491                  */
 492                 wmb();
 493
 494                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 495         }
 496 out:
 497         spin_unlock_irqrestore(&srq->lock, flags);
 498
 499         return err;
 500 }