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         size_t ucmdlen;
  51         int err;
  52         int npages;
  53         int page_shift;
  54         int ncont;
  55         u32 offset;
  56         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  57
  58         ucmdlen = min(udata->inlen, sizeof(ucmd));
  59
  60         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  61                 mlx5_ib_dbg(dev, "failed copy udata\n");
  62                 return -EFAULT;
  63         }
  64
  65         if (ucmd.reserved0 || ucmd.reserved1)
  66                 return -EINVAL;
  67
  68         if (udata->inlen > sizeof(ucmd) &&
  69             !ib_is_udata_cleared(udata, sizeof(ucmd),
  70                                  udata->inlen - sizeof(ucmd)))
  71                 return -EINVAL;
  72
  73         if (in->type != IB_SRQT_BASIC) {
  74                 err = get_srq_user_index(to_mucontext(pd->uobject->context),
  75                                          &ucmd, udata->inlen, &uidx);
  76                 if (err)
  77                         return err;
  78         }
  79
  80         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
  81
  82         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
  83                                 0, 0);
  84         if (IS_ERR(srq->umem)) {
  85                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
  86                 err = PTR_ERR(srq->umem);
  87                 return err;
  88         }
  89
  90         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages,
  91                            &page_shift, &ncont, NULL);
  92         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
  93                                      &offset);
  94         if (err) {
  95                 mlx5_ib_warn(dev, "bad offset\n");
  96                 goto err_umem;
  97         }
  98
  99         in->pas = kvcalloc(ncont, sizeof(*in->pas), GFP_KERNEL);
 100         if (!in->pas) {
 101                 err = -ENOMEM;
 102                 goto err_umem;
 103         }
 104
 105         mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0);
 106
 107         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 108                                   ucmd.db_addr, &srq->db);
 109         if (err) {
 110                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 111                 goto err_in;
 112         }
 113
 114         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 115         in->page_offset = offset;
 116         in->uid = (in->type != IB_SRQT_XRC) ?  to_mpd(pd)->uid : 0;
 117         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 118             in->type != IB_SRQT_BASIC)
 119                 in->user_index = uidx;
 120
 121         return 0;
 122
 123 err_in:
 124         kvfree(in->pas);
 125
 126 err_umem:
 127         ib_umem_release(srq->umem);
 128
 129         return err;
 130 }
 131
 132 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 133                              struct mlx5_srq_attr *in, int buf_size)
 134 {
 135         int err;
 136         int i;
 137         struct mlx5_wqe_srq_next_seg *next;
 138
 139         err = mlx5_db_alloc(dev->mdev, &srq->db);
 140         if (err) {
 141                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 142                 return err;
 143         }
 144
 145         if (mlx5_frag_buf_alloc_node(dev->mdev, buf_size, &srq->buf,
 146                                      dev->mdev->priv.numa_node)) {
 147                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 148                 err = -ENOMEM;
 149                 goto err_db;
 150         }
 151
 152         mlx5_init_fbc(srq->buf.frags, srq->msrq.wqe_shift, ilog2(srq->msrq.max),
 153                       &srq->fbc);
 154
 155         srq->head    = 0;
 156         srq->tail    = srq->msrq.max - 1;
 157         srq->wqe_ctr = 0;
 158
 159         for (i = 0; i < srq->msrq.max; i++) {
 160                 next = get_wqe(srq, i);
 161                 next->next_wqe_index =
 162                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 163         }
 164
 165         mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift);
 166         in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL);
 167         if (!in->pas) {
 168                 err = -ENOMEM;
 169                 goto err_buf;
 170         }
 171         mlx5_fill_page_frag_array(&srq->buf, in->pas);
 172
 173         srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL);
 174         if (!srq->wrid) {
 175                 err = -ENOMEM;
 176                 goto err_in;
 177         }
 178         srq->wq_sig = 0;
 179
 180         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 181         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 182             in->type != IB_SRQT_BASIC)
 183                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 184
 185         return 0;
 186
 187 err_in:
 188         kvfree(in->pas);
 189
 190 err_buf:
 191         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 192
 193 err_db:
 194         mlx5_db_free(dev->mdev, &srq->db);
 195         return err;
 196 }
 197
 198 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 199 {
 200         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 201         ib_umem_release(srq->umem);
 202 }
 203
 204
 205 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 206 {
 207         kvfree(srq->wrid);
 208         mlx5_frag_buf_free(dev->mdev, &srq->buf);
 209         mlx5_db_free(dev->mdev, &srq->db);
 210 }
 211
 212 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 213                                   struct ib_srq_init_attr *init_attr,
 214                                   struct ib_udata *udata)
 215 {
 216         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 217         struct mlx5_ib_srq *srq;
 218         size_t desc_size;
 219         size_t buf_size;
 220         int err;
 221         struct mlx5_srq_attr in = {0};
 222         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 223
 224         /* Sanity check SRQ size before proceeding */
 225         if (init_attr->attr.max_wr >= max_srq_wqes) {
 226                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 227                             init_attr->attr.max_wr,
 228                             max_srq_wqes);
 229                 return ERR_PTR(-EINVAL);
 230         }
 231
 232         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 233         if (!srq)
 234                 return ERR_PTR(-ENOMEM);
 235
 236         mutex_init(&srq->mutex);
 237         spin_lock_init(&srq->lock);
 238         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 239         srq->msrq.max_gs = init_attr->attr.max_sge;
 240
 241         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 242                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 243         if (desc_size == 0 || srq->msrq.max_gs > desc_size) {
 244                 err = -EINVAL;
 245                 goto err_srq;
 246         }
 247         desc_size = roundup_pow_of_two(desc_size);
 248         desc_size = max_t(size_t, 32, desc_size);
 249         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) {
 250                 err = -EINVAL;
 251                 goto err_srq;
 252         }
 253         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 254                 sizeof(struct mlx5_wqe_data_seg);
 255         srq->msrq.wqe_shift = ilog2(desc_size);
 256         buf_size = srq->msrq.max * desc_size;
 257         if (buf_size < desc_size) {
 258                 err = -EINVAL;
 259                 goto err_srq;
 260         }
 261         in.type = init_attr->srq_type;
 262
 263         if (udata)
 264                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 265         else
 266                 err = create_srq_kernel(dev, srq, &in, buf_size);
 267
 268         if (err) {
 269                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 270                              udata ? "user" : "kernel", err);
 271                 goto err_srq;
 272         }
 273
 274         in.log_size = ilog2(srq->msrq.max);
 275         in.wqe_shift = srq->msrq.wqe_shift - 4;
 276         if (srq->wq_sig)
 277                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 278
 279         if (init_attr->srq_type == IB_SRQT_XRC)
 280                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 281         else
 282                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 283
 284         if (init_attr->srq_type == IB_SRQT_TM) {
 285                 in.tm_log_list_size =
 286                         ilog2(init_attr->ext.tag_matching.max_num_tags) + 1;
 287                 if (in.tm_log_list_size >
 288                     MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) {
 289                         mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n");
 290                         err = -EINVAL;
 291                         goto err_usr_kern_srq;
 292                 }
 293                 in.flags |= MLX5_SRQ_FLAG_RNDV;
 294         }
 295
 296         if (ib_srq_has_cq(init_attr->srq_type))
 297                 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn;
 298         else
 299                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 300
 301         in.pd = to_mpd(pd)->pdn;
 302         in.db_record = srq->db.dma;
 303         err = mlx5_cmd_create_srq(dev, &srq->msrq, &in);
 304         kvfree(in.pas);
 305         if (err) {
 306                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 307                 goto err_usr_kern_srq;
 308         }
 309
 310         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 311
 312         srq->msrq.event = mlx5_ib_srq_event;
 313         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 314
 315         if (udata)
 316                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 317                         mlx5_ib_dbg(dev, "copy to user failed\n");
 318                         err = -EFAULT;
 319                         goto err_core;
 320                 }
 321
 322         init_attr->attr.max_wr = srq->msrq.max - 1;
 323
 324         return &srq->ibsrq;
 325
 326 err_core:
 327         mlx5_cmd_destroy_srq(dev, &srq->msrq);
 328
 329 err_usr_kern_srq:
 330         if (udata)
 331                 destroy_srq_user(pd, srq);
 332         else
 333                 destroy_srq_kernel(dev, srq);
 334
 335 err_srq:
 336         kfree(srq);
 337
 338         return ERR_PTR(err);
 339 }
 340
 341 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 342                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 343 {
 344         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 345         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 346         int ret;
 347
 348         /* We don't support resizing SRQs yet */
 349         if (attr_mask & IB_SRQ_MAX_WR)
 350                 return -EINVAL;
 351
 352         if (attr_mask & IB_SRQ_LIMIT) {
 353                 if (attr->srq_limit >= srq->msrq.max)
 354                         return -EINVAL;
 355
 356                 mutex_lock(&srq->mutex);
 357                 ret = mlx5_cmd_arm_srq(dev, &srq->msrq, attr->srq_limit, 1);
 358                 mutex_unlock(&srq->mutex);
 359
 360                 if (ret)
 361                         return ret;
 362         }
 363
 364         return 0;
 365 }
 366
 367 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 368 {
 369         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 370         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 371         int ret;
 372         struct mlx5_srq_attr *out;
 373
 374         out = kzalloc(sizeof(*out), GFP_KERNEL);
 375         if (!out)
 376                 return -ENOMEM;
 377
 378         ret = mlx5_cmd_query_srq(dev, &srq->msrq, out);
 379         if (ret)
 380                 goto out_box;
 381
 382         srq_attr->srq_limit = out->lwm;
 383         srq_attr->max_wr    = srq->msrq.max - 1;
 384         srq_attr->max_sge   = srq->msrq.max_gs;
 385
 386 out_box:
 387         kfree(out);
 388         return ret;
 389 }
 390
 391 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 392 {
 393         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 394         struct mlx5_ib_srq *msrq = to_msrq(srq);
 395
 396         mlx5_cmd_destroy_srq(dev, &msrq->msrq);
 397
 398         if (srq->uobject) {
 399                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 400                 ib_umem_release(msrq->umem);
 401         } else {
 402                 destroy_srq_kernel(dev, msrq);
 403         }
 404
 405         kfree(srq);
 406         return 0;
 407 }
 408
 409 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 410 {
 411         struct mlx5_wqe_srq_next_seg *next;
 412
 413         /* always called with interrupts disabled. */
 414         spin_lock(&srq->lock);
 415
 416         next = get_wqe(srq, srq->tail);
 417         next->next_wqe_index = cpu_to_be16(wqe_index);
 418         srq->tail = wqe_index;
 419
 420         spin_unlock(&srq->lock);
 421 }
 422
 423 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 424                           const struct ib_recv_wr **bad_wr)
 425 {
 426         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 427         struct mlx5_wqe_srq_next_seg *next;
 428         struct mlx5_wqe_data_seg *scat;
 429         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 430         struct mlx5_core_dev *mdev = dev->mdev;
 431         unsigned long flags;
 432         int err = 0;
 433         int nreq;
 434         int i;
 435
 436         spin_lock_irqsave(&srq->lock, flags);
 437
 438         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 439                 err = -EIO;
 440                 *bad_wr = wr;
 441                 goto out;
 442         }
 443
 444         for (nreq = 0; wr; nreq++, wr = wr->next) {
 445                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 446                         err = -EINVAL;
 447                         *bad_wr = wr;
 448                         break;
 449                 }
 450
 451                 if (unlikely(srq->head == srq->tail)) {
 452                         err = -ENOMEM;
 453                         *bad_wr = wr;
 454                         break;
 455                 }
 456
 457                 srq->wrid[srq->head] = wr->wr_id;
 458
 459                 next      = get_wqe(srq, srq->head);
 460                 srq->head = be16_to_cpu(next->next_wqe_index);
 461                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 462
 463                 for (i = 0; i < wr->num_sge; i++) {
 464                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 465                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 466                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 467                 }
 468
 469                 if (i < srq->msrq.max_avail_gather) {
 470                         scat[i].byte_count = 0;
 471                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 472                         scat[i].addr       = 0;
 473                 }
 474         }
 475
 476         if (likely(nreq)) {
 477                 srq->wqe_ctr += nreq;
 478
 479                 /* Make sure that descriptors are written before
 480                  * doorbell record.
 481                  */
 482                 wmb();
 483
 484                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 485         }
 486 out:
 487         spin_unlock_irqrestore(&srq->lock, flags);
 488
 489         return err;
 490 }