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, &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 = mlx5_vzalloc(sizeof(*in->pas) * ncont);
 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 = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages);
 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                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 202                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 203                 err = -ENOMEM;
 204                 goto err_in;
 205         }
 206         srq->wq_sig = !!srq_signature;
 207
 208         in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 209         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 210             in->type == IB_SRQT_XRC)
 211                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 212
 213         return 0;
 214
 215 err_in:
 216         kvfree(in->pas);
 217
 218 err_buf:
 219         mlx5_buf_free(dev->mdev, &srq->buf);
 220
 221 err_db:
 222         mlx5_db_free(dev->mdev, &srq->db);
 223         return err;
 224 }
 225
 226 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 227 {
 228         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 229         ib_umem_release(srq->umem);
 230 }
 231
 232
 233 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 234 {
 235         kfree(srq->wrid);
 236         mlx5_buf_free(dev->mdev, &srq->buf);
 237         mlx5_db_free(dev->mdev, &srq->db);
 238 }
 239
 240 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 241                                   struct ib_srq_init_attr *init_attr,
 242                                   struct ib_udata *udata)
 243 {
 244         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 245         struct mlx5_ib_srq *srq;
 246         size_t desc_size;
 247         size_t buf_size;
 248         int err;
 249         struct mlx5_srq_attr in = {0};
 250         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 251
 252         /* Sanity check SRQ size before proceeding */
 253         if (init_attr->attr.max_wr >= max_srq_wqes) {
 254                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 255                             init_attr->attr.max_wr,
 256                             max_srq_wqes);
 257                 return ERR_PTR(-EINVAL);
 258         }
 259
 260         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 261         if (!srq)
 262                 return ERR_PTR(-ENOMEM);
 263
 264         mutex_init(&srq->mutex);
 265         spin_lock_init(&srq->lock);
 266         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 267         srq->msrq.max_gs = init_attr->attr.max_sge;
 268
 269         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 270                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 271         if (desc_size == 0 || srq->msrq.max_gs > desc_size) {
 272                 err = -EINVAL;
 273                 goto err_srq;
 274         }
 275         desc_size = roundup_pow_of_two(desc_size);
 276         desc_size = max_t(size_t, 32, desc_size);
 277         if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) {
 278                 err = -EINVAL;
 279                 goto err_srq;
 280         }
 281         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 282                 sizeof(struct mlx5_wqe_data_seg);
 283         srq->msrq.wqe_shift = ilog2(desc_size);
 284         buf_size = srq->msrq.max * desc_size;
 285         if (buf_size < desc_size) {
 286                 err = -EINVAL;
 287                 goto err_srq;
 288         }
 289         in.type = init_attr->srq_type;
 290
 291         if (pd->uobject)
 292                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 293         else
 294                 err = create_srq_kernel(dev, srq, &in, buf_size);
 295
 296         if (err) {
 297                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 298                              pd->uobject ? "user" : "kernel", err);
 299                 goto err_srq;
 300         }
 301
 302         in.log_size = ilog2(srq->msrq.max);
 303         in.wqe_shift = srq->msrq.wqe_shift - 4;
 304         if (srq->wq_sig)
 305                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 306         if (init_attr->srq_type == IB_SRQT_XRC) {
 307                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 308                 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
 309         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 310                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 311                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 312         }
 313
 314         in.pd = to_mpd(pd)->pdn;
 315         in.db_record = srq->db.dma;
 316         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
 317         kvfree(in.pas);
 318         if (err) {
 319                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 320                 goto err_usr_kern_srq;
 321         }
 322
 323         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 324
 325         srq->msrq.event = mlx5_ib_srq_event;
 326         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 327
 328         if (pd->uobject)
 329                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 330                         mlx5_ib_dbg(dev, "copy to user failed\n");
 331                         err = -EFAULT;
 332                         goto err_core;
 333                 }
 334
 335         init_attr->attr.max_wr = srq->msrq.max - 1;
 336
 337         return &srq->ibsrq;
 338
 339 err_core:
 340         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 341
 342 err_usr_kern_srq:
 343         if (pd->uobject)
 344                 destroy_srq_user(pd, srq);
 345         else
 346                 destroy_srq_kernel(dev, srq);
 347
 348 err_srq:
 349         kfree(srq);
 350
 351         return ERR_PTR(err);
 352 }
 353
 354 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 355                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 356 {
 357         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 358         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 359         int ret;
 360
 361         /* We don't support resizing SRQs yet */
 362         if (attr_mask & IB_SRQ_MAX_WR)
 363                 return -EINVAL;
 364
 365         if (attr_mask & IB_SRQ_LIMIT) {
 366                 if (attr->srq_limit >= srq->msrq.max)
 367                         return -EINVAL;
 368
 369                 mutex_lock(&srq->mutex);
 370                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 371                 mutex_unlock(&srq->mutex);
 372
 373                 if (ret)
 374                         return ret;
 375         }
 376
 377         return 0;
 378 }
 379
 380 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 381 {
 382         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 383         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 384         int ret;
 385         struct mlx5_srq_attr *out;
 386
 387         out = kzalloc(sizeof(*out), GFP_KERNEL);
 388         if (!out)
 389                 return -ENOMEM;
 390
 391         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 392         if (ret)
 393                 goto out_box;
 394
 395         srq_attr->srq_limit = out->lwm;
 396         srq_attr->max_wr    = srq->msrq.max - 1;
 397         srq_attr->max_sge   = srq->msrq.max_gs;
 398
 399 out_box:
 400         kfree(out);
 401         return ret;
 402 }
 403
 404 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 405 {
 406         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 407         struct mlx5_ib_srq *msrq = to_msrq(srq);
 408
 409         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 410
 411         if (srq->uobject) {
 412                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 413                 ib_umem_release(msrq->umem);
 414         } else {
 415                 destroy_srq_kernel(dev, msrq);
 416         }
 417
 418         kfree(srq);
 419         return 0;
 420 }
 421
 422 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 423 {
 424         struct mlx5_wqe_srq_next_seg *next;
 425
 426         /* always called with interrupts disabled. */
 427         spin_lock(&srq->lock);
 428
 429         next = get_wqe(srq, srq->tail);
 430         next->next_wqe_index = cpu_to_be16(wqe_index);
 431         srq->tail = wqe_index;
 432
 433         spin_unlock(&srq->lock);
 434 }
 435
 436 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 437                           struct ib_recv_wr **bad_wr)
 438 {
 439         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 440         struct mlx5_wqe_srq_next_seg *next;
 441         struct mlx5_wqe_data_seg *scat;
 442         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 443         struct mlx5_core_dev *mdev = dev->mdev;
 444         unsigned long flags;
 445         int err = 0;
 446         int nreq;
 447         int i;
 448
 449         spin_lock_irqsave(&srq->lock, flags);
 450
 451         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 452                 err = -EIO;
 453                 *bad_wr = wr;
 454                 goto out;
 455         }
 456
 457         for (nreq = 0; wr; nreq++, wr = wr->next) {
 458                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 459                         err = -EINVAL;
 460                         *bad_wr = wr;
 461                         break;
 462                 }
 463
 464                 if (unlikely(srq->head == srq->tail)) {
 465                         err = -ENOMEM;
 466                         *bad_wr = wr;
 467                         break;
 468                 }
 469
 470                 srq->wrid[srq->head] = wr->wr_id;
 471
 472                 next      = get_wqe(srq, srq->head);
 473                 srq->head = be16_to_cpu(next->next_wqe_index);
 474                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 475
 476                 for (i = 0; i < wr->num_sge; i++) {
 477                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 478                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 479                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 480                 }
 481
 482                 if (i < srq->msrq.max_avail_gather) {
 483                         scat[i].byte_count = 0;
 484                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 485                         scat[i].addr       = 0;
 486                 }
 487         }
 488
 489         if (likely(nreq)) {
 490                 srq->wqe_ctr += nreq;
 491
 492                 /* Make sure that descriptors are written before
 493                  * doorbell record.
 494                  */
 495                 wmb();
 496
 497                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 498         }
 499 out:
 500         spin_unlock_irqrestore(&srq->lock, flags);
 501
 502         return err;
 503 }