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