drivers/infiniband/hw/mlx5/srq.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2013-2018, Mellanox Technologies inc.  All rights reserved.
   4  */
   5
   6 #include <linux/mlx5/qp.h>
   7 #include <linux/slab.h>
   8 #include <rdma/ib_umem.h>
   9 #include <rdma/ib_user_verbs.h>
  10 #include "mlx5_ib.h"
  11 #include "srq.h"
  12
  13 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
  14 {
  15         return mlx5_frag_buf_get_wqe(&srq->fbc, n);
  16 }
  17
  18 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
  19 {
  20         struct ib_event event;
  21         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  22
  23         if (ibsrq->event_handler) {
  24                 event.device      = ibsrq->device;
  25                 event.element.srq = ibsrq;
  26                 switch (type) {
  27                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
  28                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  29                         break;
  30                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
  31                         event.event = IB_EVENT_SRQ_ERR;
  32                         break;
  33                 default:
  34                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
  35                                 type, srq->srqn);
  36                         return;
  37                 }
  38
  39                 ibsrq->event_handler(&event, ibsrq->srq_context);
  40         }
  41 }
  42
  43 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  44                            struct mlx5_srq_attr *in,
  45                            struct ib_udata *udata, int buf_size)
  46 {
  47         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  48         struct mlx5_ib_create_srq ucmd = {};
  49         struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
  50                 udata, struct mlx5_ib_ucontext, ibucontext);
  51         size_t ucmdlen;
  52         int err;
  53         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  54
  55         ucmdlen = min(udata->inlen, sizeof(ucmd));
  56
  57         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  58                 mlx5_ib_dbg(dev, "failed copy udata\n");
  59                 return -EFAULT;
  60         }
  61
  62         if (ucmd.reserved0 || ucmd.reserved1)
  63                 return -EINVAL;
  64
  65         if (udata->inlen > sizeof(ucmd) &&
  66             !ib_is_udata_cleared(udata, sizeof(ucmd),
  67                                  udata->inlen - sizeof(ucmd)))
  68                 return -EINVAL;
  69
  70         if (in->type != IB_SRQT_BASIC) {
  71                 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
  72                 if (err)
  73                         return err;
  74         }
  75
  76         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
  77
  78         srq->umem = ib_umem_get(pd->device, ucmd.buf_addr, buf_size, 0);
  79         if (IS_ERR(srq->umem)) {
  80                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
  81                 err = PTR_ERR(srq->umem);
  82                 return err;
  83         }
  84         in->umem = srq->umem;
  85
  86         err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
  87         if (err) {
  88                 mlx5_ib_dbg(dev, "map doorbell failed\n");
  89                 goto err_umem;
  90         }
  91
  92         in->uid = (in->type != IB_SRQT_XRC) ?  to_mpd(pd)->uid : 0;
  93         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
  94             in->type != IB_SRQT_BASIC)
  95                 in->user_index = uidx;
  96
  97         return 0;
  98
  99 err_umem:
 100         ib_umem_release(srq->umem);
 101
 102         return err;
 103 }
 104
 105 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 106                              struct mlx5_srq_attr *in, int buf_size)
 107 {
 108         int err;
 109         int i;
 110         struct mlx5_wqe_srq_next_seg *next;
 111
 112         err = mlx5_db_alloc(dev->mdev, &srq->db);
 113         if (err) {
 114                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 115                 return err;
 116         }
 117
 118         if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
 119                                      dev->mdev->priv.numa_node)) {
 120                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 121                 err = -ENOMEM;
 122                 goto err_db;
 123         }
 124
 125         mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
 126                       &srq->fbc);
 127
 128         srq->head    = 0;
 129         srq->tail    = srq->msrq.max - 1;
 130         srq->wqe_ctr = 0;
 131
 132         for (i = 0; i < srq->msrq.max; i++) {
 133                 next = get_wqe(srq, i);
 134                 next->next_wqe_index =
 135                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 136         }
 137
 138         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
 139         in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
 140         if (!in->pas) {
 141                 err = -ENOMEM;
 142                 goto err_buf;
 143         }
 144         mlx5_fill_page_frag_array(&srq->buf, in->pas);
 145
 146         srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
 147         if (!srq->wrid) {
 148                 err = -ENOMEM;
 149                 goto err_in;
 150         }
 151         srq->wq_sig = 0;
 152
 153         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 154         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 155             in->type != IB_SRQT_BASIC)
 156                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 157
 158         return 0;
 159
 160 err_in:
 161         kvfree(in->pas);
 162
 163 err_buf:
 164         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 165
 166 err_db:
 167         mlx5_db_free(dev->mdev, &srq->db);
 168         return err;
 169 }
 170
 171 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
 172                              struct ib_udata *udata)
 173 {
 174         mlx5_ib_db_unmap_user(
 175                 rdma_udata_to_drv_context(
 176                         udata,
 177                         struct mlx5_ib_ucontext,
 178                         ibucontext),
 179                 &srq->db);
 180         ib_umem_release(srq->umem);
 181 }
 182
 183
 184 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 185 {
 186         kvfree(srq->wrid);
 187         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 188         mlx5_db_free(dev->mdev, &srq->db);
 189 }
 190
 191 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
 192                        struct ib_srq_init_attr *init_attr,
 193                        struct ib_udata *udata)
 194 {
 195         struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
 196         struct mlx5_ib_srq *srq = to_msrq(ib_srq);
 197         size_t desc_size;
 198         size_t buf_size;
 199         int err;
 200         struct mlx5_srq_attr in = {};
 201         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 202
 203         if (init_attr->srq_type != IB_SRQT_BASIC &&
 204             init_attr->srq_type != IB_SRQT_XRC &&
 205             init_attr->srq_type != IB_SRQT_TM)
 206                 return -EOPNOTSUPP;
 207
 208         /* Sanity check SRQ size before proceeding */
 209         if (init_attr->attr.max_wr >= max_srq_wqes) {
 210                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 211                             init_attr->attr.max_wr,
 212                             max_srq_wqes);
 213                 return -EINVAL;
 214         }
 215
 216         mutex_init(&srq->mutex);
 217         spin_lock_init(&srq->lock);
 218         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 219         srq->msrq.max_gs = init_attr->attr.max_sge;
 220
 221         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 222                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 223         if (desc_size == 0 || srq->msrq.max_gs > desc_size)
 224                 return -EINVAL;
 225
 226         desc_size = roundup_pow_of_two(desc_size);
 227         desc_size = max_t(size_t, 32, desc_size);
 228         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
 229                 return -EINVAL;
 230
 231         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 232                 sizeof(struct mlx5_wqe_data_seg);
 233         srq->msrq.wqe_shift = ilog2(desc_size);
 234         buf_size = srq->msrq.max * desc_size;
 235         if (buf_size < desc_size)
 236                 return -EINVAL;
 237
 238         in.type = init_attr->srq_type;
 239
 240         if (udata)
 241                 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
 242         else
 243                 err = create_srq_kernel(dev, srq, &in, buf_size);
 244
 245         if (err) {
 246                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 247                              udata ? "user" : "kernel", err);
 248                 return err;
 249         }
 250
 251         in.log_size = ilog2(srq->msrq.max);
 252         in.wqe_shift = srq->msrq.wqe_shift - 4;
 253         if (srq->wq_sig)
 254                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 255
 256         if (init_attr->srq_type == IB_SRQT_XRC && init_attr->ext.xrc.xrcd)
 257                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 258         else
 259                 in.xrcd = dev->devr.xrcdn0;
 260
 261         if (init_attr->srq_type == IB_SRQT_TM) {
 262                 in.tm_log_list_size =
 263                         ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
 264                 if (in.tm_log_list_size >
 265                     MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
 266                         mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
 267                         err = -EINVAL;
 268                         goto err_usr_kern_srq;
 269                 }
 270                 in.flags |= MLX5_SRQ_FLAG_RNDV;
 271         }
 272
 273         if (ib_srq_has_cq(init_attr->srq_type))
 274                 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
 275         else
 276                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 277
 278         in.pd = to_mpd(ib_srq->pd)->pdn;
 279         in.db_record = srq->db.dma;
 280         err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
 281         kvfree(in.pas);
 282         if (err) {
 283                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 284                 goto err_usr_kern_srq;
 285         }
 286
 287         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 288
 289         srq->msrq.event = mlx5_ib_srq_event;
 290         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 291
 292         if (udata) {
 293                 struct mlx5_ib_create_srq_resp resp = {
 294                         .srqn = srq->msrq.srqn,
 295                 };
 296
 297                 if (ib_copy_to_udata(udata, &resp, min(udata->outlen,
 298                                      sizeof(resp)))) {
 299                         mlx5_ib_dbg(dev, "copy to user failed\n");
 300                         err = -EFAULT;
 301                         goto err_core;
 302                 }
 303         }
 304
 305         init_attr->attr.max_wr = srq->msrq.max - 1;
 306
 307         return 0;
 308
 309 err_core:
 310         mlx5_cmd_destroy_srq(dev, &srq->msrq);
 311
 312 err_usr_kern_srq:
 313         if (udata)
 314                 destroy_srq_user(ib_srq->pd, srq, udata);
 315         else
 316                 destroy_srq_kernel(dev, srq);
 317
 318         return err;
 319 }
 320
 321 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 322                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 323 {
 324         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 325         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 326         int ret;
 327
 328         /* We don't support resizing SRQs yet */
 329         if (attr_mask & IB_SRQ_MAX_WR)
 330                 return -EINVAL;
 331
 332         if (attr_mask & IB_SRQ_LIMIT) {
 333                 if (attr->srq_limit >= srq->msrq.max)
 334                         return -EINVAL;
 335
 336                 mutex_lock(&srq->mutex);
 337                 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
 338                 mutex_unlock(&srq->mutex);
 339
 340                 if (ret)
 341                         return ret;
 342         }
 343
 344         return 0;
 345 }
 346
 347 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 348 {
 349         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 350         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 351         int ret;
 352         struct mlx5_srq_attr *out;
 353
 354         out = kzalloc(sizeof(*out), GFP_KERNEL);
 355         if (!out)
 356                 return -ENOMEM;
 357
 358         ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
 359         if (ret)
 360                 goto out_box;
 361
 362         srq_attr->srq_limit = out->lwm;
 363         srq_attr->max_wr    = srq->msrq.max - 1;
 364         srq_attr->max_sge   = srq->msrq.max_gs;
 365
 366 out_box:
 367         kfree(out);
 368         return ret;
 369 }
 370
 371 int mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
 372 {
 373         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 374         struct mlx5_ib_srq *msrq = to_msrq(srq);
 375         int ret;
 376
 377         ret = mlx5_cmd_destroy_srq(dev, &msrq->msrq);
 378         if (ret)
 379                 return ret;
 380
 381         if (udata)
 382                 destroy_srq_user(srq->pd, msrq, udata);
 383         else
 384                 destroy_srq_kernel(dev, msrq);
 385         return 0;
 386 }
 387
 388 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 389 {
 390         struct mlx5_wqe_srq_next_seg *next;
 391
 392         /* always called with interrupts disabled. */
 393         spin_lock(&srq->lock);
 394
 395         next = get_wqe(srq, srq->tail);
 396         next->next_wqe_index = cpu_to_be16(wqe_index);
 397         srq->tail = wqe_index;
 398
 399         spin_unlock(&srq->lock);
 400 }
 401
 402 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 403                           const struct ib_recv_wr **bad_wr)
 404 {
 405         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 406         struct mlx5_wqe_srq_next_seg *next;
 407         struct mlx5_wqe_data_seg *scat;
 408         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 409         struct mlx5_core_dev *mdev = dev->mdev;
 410         unsigned long flags;
 411         int err = 0;
 412         int nreq;
 413         int i;
 414
 415         spin_lock_irqsave(&srq->lock, flags);
 416
 417         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 418                 err = -EIO;
 419                 *bad_wr = wr;
 420                 goto out;
 421         }
 422
 423         for (nreq = 0; wr; nreq++, wr = wr->next) {
 424                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 425                         err = -EINVAL;
 426                         *bad_wr = wr;
 427                         break;
 428                 }
 429
 430                 if (unlikely(srq->head == srq->tail)) {
 431                         err = -ENOMEM;
 432                         *bad_wr = wr;
 433                         break;
 434                 }
 435
 436                 srq->wrid[srq->head] = wr->wr_id;
 437
 438                 next      = get_wqe(srq, srq->head);
 439                 srq->head = be16_to_cpu(next->next_wqe_index);
 440                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 441
 442                 for (i = 0; i < wr->num_sge; i++) {
 443                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 444                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 445                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 446                 }
 447
 448                 if (i < srq->msrq.max_avail_gather) {
 449                         scat[i].byte_count = 0;
 450                         scat[i].lkey = dev->mkeys.terminate_scatter_list_mkey;
 451                         scat[i].addr       = 0;
 452                 }
 453         }
 454
 455         if (likely(nreq)) {
 456                 srq->wqe_ctr += nreq;
 457
 458                 /* Make sure that descriptors are written before
 459                  * doorbell record.
 460                  */
 461                 wmb();
 462
 463                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 464         }
 465 out:
 466         spin_unlock_irqrestore(&srq->lock, flags);
 467
 468         return err;
 469 }