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/module.h>
   7 #include <linux/mlx5/qp.h>
   8 #include <linux/slab.h>
   9 #include <rdma/ib_umem.h>
  10 #include <rdma/ib_user_verbs.h>
  11 #include "mlx5_ib.h"
  12 #include "srq.h"
  13
  14 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
  15 {
  16         return mlx5_frag_buf_get_wqe(&srq->fbc, n);
  17 }
  18
  19 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
  20 {
  21         struct ib_event event;
  22         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  23
  24         if (ibsrq->event_handler) {
  25                 event.device      = ibsrq->device;
  26                 event.element.srq = ibsrq;
  27                 switch (type) {
  28                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
  29                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  30                         break;
  31                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
  32                         event.event = IB_EVENT_SRQ_ERR;
  33                         break;
  34                 default:
  35                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
  36                                 type, srq->srqn);
  37                         return;
  38                 }
  39
  40                 ibsrq->event_handler(&event, ibsrq->srq_context);
  41         }
  42 }
  43
  44 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  45                            struct mlx5_srq_attr *in,
  46                            struct ib_udata *udata, int buf_size)
  47 {
  48         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  49         struct mlx5_ib_create_srq ucmd = {};
  50         struct mlx5_ib_ucontext *ucontext = rdma_udata_to_drv_context(
  51                 udata, struct mlx5_ib_ucontext, ibucontext);
  52         size_t ucmdlen;
  53         int err;
  54         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  55
  56         ucmdlen = min(udata->inlen, sizeof(ucmd));
  57
  58         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  59                 mlx5_ib_dbg(dev, "failed copy udata\n");
  60                 return -EFAULT;
  61         }
  62
  63         if (ucmd.reserved0 || ucmd.reserved1)
  64                 return -EINVAL;
  65
  66         if (udata->inlen > sizeof(ucmd) &&
  67             !ib_is_udata_cleared(udata, sizeof(ucmd),
  68                                  udata->inlen - sizeof(ucmd)))
  69                 return -EINVAL;
  70
  71         if (in->type != IB_SRQT_BASIC) {
  72                 err = get_srq_user_index(ucontext, &ucmd, udata->inlen, &uidx);
  73                 if (err)
  74                         return err;
  75         }
  76
  77         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
  78
  79         srq->umem = ib_umem_get(pd->device, ucmd.buf_addr, buf_size, 0);
  80         if (IS_ERR(srq->umem)) {
  81                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
  82                 err = PTR_ERR(srq->umem);
  83                 return err;
  84         }
  85         in->umem = srq->umem;
  86
  87         err = mlx5_ib_db_map_user(ucontext, ucmd.db_addr, &srq->db);
  88         if (err) {
  89                 mlx5_ib_dbg(dev, "map doorbell failed\n");
  90                 goto err_umem;
  91         }
  92
  93         in->uid = (in->type != IB_SRQT_XRC) ?  to_mpd(pd)->uid : 0;
  94         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
  95             in->type != IB_SRQT_BASIC)
  96                 in->user_index = uidx;
  97
  98         return 0;
  99
 100 err_umem:
 101         ib_umem_release(srq->umem);
 102
 103         return err;
 104 }
 105
 106 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 107                              struct mlx5_srq_attr *in, int buf_size)
 108 {
 109         int err;
 110         int i;
 111         struct mlx5_wqe_srq_next_seg *next;
 112
 113         err = mlx5_db_alloc(dev->mdev, &srq->db);
 114         if (err) {
 115                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 116                 return err;
 117         }
 118
 119         if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
 120                                      dev->mdev->priv.numa_node)) {
 121                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 122                 err = -ENOMEM;
 123                 goto err_db;
 124         }
 125
 126         mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
 127                       &srq->fbc);
 128
 129         srq->head    = 0;
 130         srq->tail    = srq->msrq.max - 1;
 131         srq->wqe_ctr = 0;
 132
 133         for (i = 0; i < srq->msrq.max; i++) {
 134                 next = get_wqe(srq, i);
 135                 next->next_wqe_index =
 136                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 137         }
 138
 139         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
 140         in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
 141         if (!in->pas) {
 142                 err = -ENOMEM;
 143                 goto err_buf;
 144         }
 145         mlx5_fill_page_frag_array(&srq->buf, in->pas);
 146
 147         srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
 148         if (!srq->wrid) {
 149                 err = -ENOMEM;
 150                 goto err_in;
 151         }
 152         srq->wq_sig = 0;
 153
 154         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 155         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 156             in->type != IB_SRQT_BASIC)
 157                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 158
 159         return 0;
 160
 161 err_in:
 162         kvfree(in->pas);
 163
 164 err_buf:
 165         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 166
 167 err_db:
 168         mlx5_db_free(dev->mdev, &srq->db);
 169         return err;
 170 }
 171
 172 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
 173                              struct ib_udata *udata)
 174 {
 175         mlx5_ib_db_unmap_user(
 176                 rdma_udata_to_drv_context(
 177                         udata,
 178                         struct mlx5_ib_ucontext,
 179                         ibucontext),
 180                 &srq->db);
 181         ib_umem_release(srq->umem);
 182 }
 183
 184
 185 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 186 {
 187         kvfree(srq->wrid);
 188         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 189         mlx5_db_free(dev->mdev, &srq->db);
 190 }
 191
 192 int mlx5_ib_create_srq(struct ib_srq *ib_srq,
 193                        struct ib_srq_init_attr *init_attr,
 194                        struct ib_udata *udata)
 195 {
 196         struct mlx5_ib_dev *dev = to_mdev(ib_srq->device);
 197         struct mlx5_ib_srq *srq = to_msrq(ib_srq);
 198         size_t desc_size;
 199         size_t buf_size;
 200         int err;
 201         struct mlx5_srq_attr in = {};
 202         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 203
 204         if (init_attr->srq_type != IB_SRQT_BASIC &&
 205             init_attr->srq_type != IB_SRQT_XRC &&
 206             init_attr->srq_type != IB_SRQT_TM)
 207                 return -EOPNOTSUPP;
 208
 209         /* Sanity check SRQ size before proceeding */
 210         if (init_attr->attr.max_wr >= max_srq_wqes) {
 211                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 212                             init_attr->attr.max_wr,
 213                             max_srq_wqes);
 214                 return -EINVAL;
 215         }
 216
 217         mutex_init(&srq->mutex);
 218         spin_lock_init(&srq->lock);
 219         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 220         srq->msrq.max_gs = init_attr->attr.max_sge;
 221
 222         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 223                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 224         if (desc_size == 0 || srq->msrq.max_gs > desc_size)
 225                 return -EINVAL;
 226
 227         desc_size = roundup_pow_of_two(desc_size);
 228         desc_size = max_t(size_t, 32, desc_size);
 229         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg))
 230                 return -EINVAL;
 231
 232         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 233                 sizeof(struct mlx5_wqe_data_seg);
 234         srq->msrq.wqe_shift = ilog2(desc_size);
 235         buf_size = srq->msrq.max * desc_size;
 236         if (buf_size < desc_size)
 237                 return -EINVAL;
 238
 239         in.type = init_attr->srq_type;
 240
 241         if (udata)
 242                 err = create_srq_user(ib_srq->pd, srq, &in, udata, buf_size);
 243         else
 244                 err = create_srq_kernel(dev, srq, &in, buf_size);
 245
 246         if (err) {
 247                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 248                              udata ? "user" : "kernel", err);
 249                 return err;
 250         }
 251
 252         in.log_size = ilog2(srq->msrq.max);
 253         in.wqe_shift = srq->msrq.wqe_shift - 4;
 254         if (srq->wq_sig)
 255                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 256
 257         if (init_attr->srq_type == IB_SRQT_XRC && init_attr->ext.xrc.xrcd)
 258                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 259         else
 260                 in.xrcd = dev->devr.xrcdn0;
 261
 262         if (init_attr->srq_type == IB_SRQT_TM) {
 263                 in.tm_log_list_size =
 264                         ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
 265                 if (in.tm_log_list_size >
 266                     MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
 267                         mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
 268                         err = -EINVAL;
 269                         goto err_usr_kern_srq;
 270                 }
 271                 in.flags |= MLX5_SRQ_FLAG_RNDV;
 272         }
 273
 274         if (ib_srq_has_cq(init_attr->srq_type))
 275                 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
 276         else
 277                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 278
 279         in.pd = to_mpd(ib_srq->pd)->pdn;
 280         in.db_record = srq->db.dma;
 281         err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
 282         kvfree(in.pas);
 283         if (err) {
 284                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 285                 goto err_usr_kern_srq;
 286         }
 287
 288         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 289
 290         srq->msrq.event = mlx5_ib_srq_event;
 291         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 292
 293         if (udata) {
 294                 struct mlx5_ib_create_srq_resp resp = {
 295                         .srqn = srq->msrq.srqn,
 296                 };
 297
 298                 if (ib_copy_to_udata(udata, &resp, min(udata->outlen,
 299                                      sizeof(resp)))) {
 300                         mlx5_ib_dbg(dev, "copy to user failed\n");
 301                         err = -EFAULT;
 302                         goto err_core;
 303                 }
 304         }
 305
 306         init_attr->attr.max_wr = srq->msrq.max - 1;
 307
 308         return 0;
 309
 310 err_core:
 311         mlx5_cmd_destroy_srq(dev, &srq->msrq);
 312
 313 err_usr_kern_srq:
 314         if (udata)
 315                 destroy_srq_user(ib_srq->pd, srq, udata);
 316         else
 317                 destroy_srq_kernel(dev, srq);
 318
 319         return err;
 320 }
 321
 322 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 323                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 324 {
 325         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 326         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 327         int ret;
 328
 329         /* We don't support resizing SRQs yet */
 330         if (attr_mask & IB_SRQ_MAX_WR)
 331                 return -EINVAL;
 332
 333         if (attr_mask & IB_SRQ_LIMIT) {
 334                 if (attr->srq_limit >= srq->msrq.max)
 335                         return -EINVAL;
 336
 337                 mutex_lock(&srq->mutex);
 338                 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
 339                 mutex_unlock(&srq->mutex);
 340
 341                 if (ret)
 342                         return ret;
 343         }
 344
 345         return 0;
 346 }
 347
 348 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 349 {
 350         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 351         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 352         int ret;
 353         struct mlx5_srq_attr *out;
 354
 355         out = kzalloc(sizeof(*out), GFP_KERNEL);
 356         if (!out)
 357                 return -ENOMEM;
 358
 359         ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
 360         if (ret)
 361                 goto out_box;
 362
 363         srq_attr->srq_limit = out->lwm;
 364         srq_attr->max_wr    = srq->msrq.max - 1;
 365         srq_attr->max_sge   = srq->msrq.max_gs;
 366
 367 out_box:
 368         kfree(out);
 369         return ret;
 370 }
 371
 372 int mlx5_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
 373 {
 374         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 375         struct mlx5_ib_srq *msrq = to_msrq(srq);
 376         int ret;
 377
 378         ret = mlx5_cmd_destroy_srq(dev, &msrq->msrq);
 379         if (ret)
 380                 return ret;
 381
 382         if (udata)
 383                 destroy_srq_user(srq->pd, msrq, udata);
 384         else
 385                 destroy_srq_kernel(dev, msrq);
 386         return 0;
 387 }
 388
 389 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 390 {
 391         struct mlx5_wqe_srq_next_seg *next;
 392
 393         /* always called with interrupts disabled. */
 394         spin_lock(&srq->lock);
 395
 396         next = get_wqe(srq, srq->tail);
 397         next->next_wqe_index = cpu_to_be16(wqe_index);
 398         srq->tail = wqe_index;
 399
 400         spin_unlock(&srq->lock);
 401 }
 402
 403 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 404                           const struct ib_recv_wr **bad_wr)
 405 {
 406         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 407         struct mlx5_wqe_srq_next_seg *next;
 408         struct mlx5_wqe_data_seg *scat;
 409         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 410         struct mlx5_core_dev *mdev = dev->mdev;
 411         unsigned long flags;
 412         int err = 0;
 413         int nreq;
 414         int i;
 415
 416         spin_lock_irqsave(&srq->lock, flags);
 417
 418         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 419                 err = -EIO;
 420                 *bad_wr = wr;
 421                 goto out;
 422         }
 423
 424         for (nreq = 0; wr; nreq++, wr = wr->next) {
 425                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 426                         err = -EINVAL;
 427                         *bad_wr = wr;
 428                         break;
 429                 }
 430
 431                 if (unlikely(srq->head == srq->tail)) {
 432                         err = -ENOMEM;
 433                         *bad_wr = wr;
 434                         break;
 435                 }
 436
 437                 srq->wrid[srq->head] = wr->wr_id;
 438
 439                 next      = get_wqe(srq, srq->head);
 440                 srq->head = be16_to_cpu(next->next_wqe_index);
 441                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 442
 443                 for (i = 0; i < wr->num_sge; i++) {
 444                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 445                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 446                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 447                 }
 448
 449                 if (i < srq->msrq.max_avail_gather) {
 450                         scat[i].byte_count = 0;
 451                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 452                         scat[i].addr       = 0;
 453                 }
 454         }
 455
 456         if (likely(nreq)) {
 457                 srq->wqe_ctr += nreq;
 458
 459                 /* Make sure that descriptors are written before
 460                  * doorbell record.
 461                  */
 462                 wmb();
 463
 464                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 465         }
 466 out:
 467         spin_unlock_irqrestore(&srq->lock, flags);
 468
 469         return err;
 470 }