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 = 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         int page_shift;
 169         int npages;
 170
 171         err = mlx5_db_alloc(dev->mdev, &srq->db);
 172         if (err) {
 173                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 174                 return err;
 175         }
 176
 177         if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
 178                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 179                 err = -ENOMEM;
 180                 goto err_db;
 181         }
 182         page_shift = srq->buf.page_shift;
 183
 184         srq->head    = 0;
 185         srq->tail    = srq->msrq.max - 1;
 186         srq->wqe_ctr = 0;
 187
 188         for (i = 0; i < srq->msrq.max; i++) {
 189                 next = get_wqe(srq, i);
 190                 next->next_wqe_index =
 191                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 192         }
 193
 194         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 195         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 196                     buf_size, page_shift, srq->buf.npages, npages);
 197         in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
 198         if (!in->pas) {
 199                 err = -ENOMEM;
 200                 goto err_buf;
 201         }
 202         mlx5_fill_page_array(&srq->buf, in->pas);
 203
 204         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 205         if (!srq->wrid) {
 206                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 207                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 208                 err = -ENOMEM;
 209                 goto err_in;
 210         }
 211         srq->wq_sig = !!srq_signature;
 212
 213         in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 214         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 215             in->type == IB_SRQT_XRC)
 216                 in->user_index = MLX5_IB_DEFAULT_UIDX;
 217
 218         return 0;
 219
 220 err_in:
 221         kvfree(in->pas);
 222
 223 err_buf:
 224         mlx5_buf_free(dev->mdev, &srq->buf);
 225
 226 err_db:
 227         mlx5_db_free(dev->mdev, &srq->db);
 228         return err;
 229 }
 230
 231 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 232 {
 233         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 234         ib_umem_release(srq->umem);
 235 }
 236
 237
 238 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 239 {
 240         kfree(srq->wrid);
 241         mlx5_buf_free(dev->mdev, &srq->buf);
 242         mlx5_db_free(dev->mdev, &srq->db);
 243 }
 244
 245 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 246                                   struct ib_srq_init_attr *init_attr,
 247                                   struct ib_udata *udata)
 248 {
 249         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 250         struct mlx5_ib_srq *srq;
 251         int desc_size;
 252         int buf_size;
 253         int err;
 254         struct mlx5_srq_attr in = {0};
 255         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 256
 257         /* Sanity check SRQ size before proceeding */
 258         if (init_attr->attr.max_wr >= max_srq_wqes) {
 259                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 260                             init_attr->attr.max_wr,
 261                             max_srq_wqes);
 262                 return ERR_PTR(-EINVAL);
 263         }
 264
 265         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 266         if (!srq)
 267                 return ERR_PTR(-ENOMEM);
 268
 269         mutex_init(&srq->mutex);
 270         spin_lock_init(&srq->lock);
 271         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 272         srq->msrq.max_gs = init_attr->attr.max_sge;
 273
 274         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 275                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 276         desc_size = roundup_pow_of_two(desc_size);
 277         desc_size = max_t(int, 32, desc_size);
 278         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 279                 sizeof(struct mlx5_wqe_data_seg);
 280         srq->msrq.wqe_shift = ilog2(desc_size);
 281         buf_size = srq->msrq.max * desc_size;
 282         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",
 283                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 284                     srq->msrq.max_avail_gather);
 285         in.type = init_attr->srq_type;
 286
 287         if (pd->uobject)
 288                 err = create_srq_user(pd, srq, &in, udata, buf_size);
 289         else
 290                 err = create_srq_kernel(dev, srq, &in, buf_size);
 291
 292         if (err) {
 293                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 294                              pd->uobject ? "user" : "kernel", err);
 295                 goto err_srq;
 296         }
 297
 298         in.log_size = ilog2(srq->msrq.max);
 299         in.wqe_shift = srq->msrq.wqe_shift - 4;
 300         if (srq->wq_sig)
 301                 in.flags |= MLX5_SRQ_FLAG_WQ_SIG;
 302         if (init_attr->srq_type == IB_SRQT_XRC) {
 303                 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 304                 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn;
 305         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 306                 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn;
 307                 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn;
 308         }
 309
 310         in.pd = to_mpd(pd)->pdn;
 311         in.db_record = srq->db.dma;
 312         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in);
 313         kvfree(in.pas);
 314         if (err) {
 315                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 316                 goto err_usr_kern_srq;
 317         }
 318
 319         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 320
 321         srq->msrq.event = mlx5_ib_srq_event;
 322         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 323
 324         if (pd->uobject)
 325                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 326                         mlx5_ib_dbg(dev, "copy to user failed\n");
 327                         err = -EFAULT;
 328                         goto err_core;
 329                 }
 330
 331         init_attr->attr.max_wr = srq->msrq.max - 1;
 332
 333         return &srq->ibsrq;
 334
 335 err_core:
 336         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 337
 338 err_usr_kern_srq:
 339         if (pd->uobject)
 340                 destroy_srq_user(pd, srq);
 341         else
 342                 destroy_srq_kernel(dev, srq);
 343
 344 err_srq:
 345         kfree(srq);
 346
 347         return ERR_PTR(err);
 348 }
 349
 350 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 351                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 352 {
 353         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 354         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 355         int ret;
 356
 357         /* We don't support resizing SRQs yet */
 358         if (attr_mask & IB_SRQ_MAX_WR)
 359                 return -EINVAL;
 360
 361         if (attr_mask & IB_SRQ_LIMIT) {
 362                 if (attr->srq_limit >= srq->msrq.max)
 363                         return -EINVAL;
 364
 365                 mutex_lock(&srq->mutex);
 366                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 367                 mutex_unlock(&srq->mutex);
 368
 369                 if (ret)
 370                         return ret;
 371         }
 372
 373         return 0;
 374 }
 375
 376 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 377 {
 378         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 379         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 380         int ret;
 381         struct mlx5_srq_attr *out;
 382
 383         out = kzalloc(sizeof(*out), GFP_KERNEL);
 384         if (!out)
 385                 return -ENOMEM;
 386
 387         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 388         if (ret)
 389                 goto out_box;
 390
 391         srq_attr->srq_limit = out->lwm;
 392         srq_attr->max_wr    = srq->msrq.max - 1;
 393         srq_attr->max_sge   = srq->msrq.max_gs;
 394
 395 out_box:
 396         kfree(out);
 397         return ret;
 398 }
 399
 400 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 401 {
 402         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 403         struct mlx5_ib_srq *msrq = to_msrq(srq);
 404
 405         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 406
 407         if (srq->uobject) {
 408                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 409                 ib_umem_release(msrq->umem);
 410         } else {
 411                 destroy_srq_kernel(dev, msrq);
 412         }
 413
 414         kfree(srq);
 415         return 0;
 416 }
 417
 418 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 419 {
 420         struct mlx5_wqe_srq_next_seg *next;
 421
 422         /* always called with interrupts disabled. */
 423         spin_lock(&srq->lock);
 424
 425         next = get_wqe(srq, srq->tail);
 426         next->next_wqe_index = cpu_to_be16(wqe_index);
 427         srq->tail = wqe_index;
 428
 429         spin_unlock(&srq->lock);
 430 }
 431
 432 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 433                           struct ib_recv_wr **bad_wr)
 434 {
 435         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 436         struct mlx5_wqe_srq_next_seg *next;
 437         struct mlx5_wqe_data_seg *scat;
 438         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 439         struct mlx5_core_dev *mdev = dev->mdev;
 440         unsigned long flags;
 441         int err = 0;
 442         int nreq;
 443         int i;
 444
 445         spin_lock_irqsave(&srq->lock, flags);
 446
 447         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 448                 err = -EIO;
 449                 *bad_wr = wr;
 450                 goto out;
 451         }
 452
 453         for (nreq = 0; wr; nreq++, wr = wr->next) {
 454                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 455                         err = -EINVAL;
 456                         *bad_wr = wr;
 457                         break;
 458                 }
 459
 460                 if (unlikely(srq->head == srq->tail)) {
 461                         err = -ENOMEM;
 462                         *bad_wr = wr;
 463                         break;
 464                 }
 465
 466                 srq->wrid[srq->head] = wr->wr_id;
 467
 468                 next      = get_wqe(srq, srq->head);
 469                 srq->head = be16_to_cpu(next->next_wqe_index);
 470                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 471
 472                 for (i = 0; i < wr->num_sge; i++) {
 473                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 474                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 475                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 476                 }
 477
 478                 if (i < srq->msrq.max_avail_gather) {
 479                         scat[i].byte_count = 0;
 480                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 481                         scat[i].addr       = 0;
 482                 }
 483         }
 484
 485         if (likely(nreq)) {
 486                 srq->wqe_ctr += nreq;
 487
 488                 /* Make sure that descriptors are written before
 489                  * doorbell record.
 490                  */
 491                 wmb();
 492
 493                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 494         }
 495 out:
 496         spin_unlock_irqrestore(&srq->lock, flags);
 497
 498         return err;
 499 }