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 #include "user.h"
  42
  43 /* not supported currently */
  44 static int srq_signature;
  45
  46 static void *get_wqe(struct mlx5_ib_srq *srq, int n)
  47 {
  48         return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
  49 }
  50
  51 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type)
  52 {
  53         struct ib_event event;
  54         struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
  55
  56         if (ibsrq->event_handler) {
  57                 event.device      = ibsrq->device;
  58                 event.element.srq = ibsrq;
  59                 switch (type) {
  60                 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
  61                         event.event = IB_EVENT_SRQ_LIMIT_REACHED;
  62                         break;
  63                 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
  64                         event.event = IB_EVENT_SRQ_ERR;
  65                         break;
  66                 default:
  67                         pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n",
  68                                 type, srq->srqn);
  69                         return;
  70                 }
  71
  72                 ibsrq->event_handler(&event, ibsrq->srq_context);
  73         }
  74 }
  75
  76 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
  77                            struct mlx5_create_srq_mbox_in **in,
  78                            struct ib_udata *udata, int buf_size, int *inlen,
  79                            int is_xrc)
  80 {
  81         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  82         struct mlx5_ib_create_srq ucmd = {};
  83         size_t ucmdlen;
  84         void *xsrqc;
  85         int err;
  86         int npages;
  87         int page_shift;
  88         int ncont;
  89         u32 offset;
  90         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  91
  92         ucmdlen = min(udata->inlen, sizeof(ucmd));
  93
  94         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  95                 mlx5_ib_dbg(dev, "failed copy udata\n");
  96                 return -EFAULT;
  97         }
  98
  99         if (ucmd.reserved0 || ucmd.reserved1)
 100                 return -EINVAL;
 101
 102         if (udata->inlen > sizeof(ucmd) &&
 103             !ib_is_udata_cleared(udata, sizeof(ucmd),
 104                                  udata->inlen - sizeof(ucmd)))
 105                 return -EINVAL;
 106
 107         if (is_xrc) {
 108                 err = get_srq_user_index(to_mucontext(pd->uobject->context),
 109                                          &ucmd, udata->inlen, &uidx);
 110                 if (err)
 111                         return err;
 112         }
 113
 114         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 115
 116         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 117                                 0, 0);
 118         if (IS_ERR(srq->umem)) {
 119                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 120                 err = PTR_ERR(srq->umem);
 121                 return err;
 122         }
 123
 124         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 125                            &page_shift, &ncont, NULL);
 126         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 127                                      &offset);
 128         if (err) {
 129                 mlx5_ib_warn(dev, "bad offset\n");
 130                 goto err_umem;
 131         }
 132
 133         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
 134         *in = mlx5_vzalloc(*inlen);
 135         if (!(*in)) {
 136                 err = -ENOMEM;
 137                 goto err_umem;
 138         }
 139
 140         mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
 141
 142         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 143                                   ucmd.db_addr, &srq->db);
 144         if (err) {
 145                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 146                 goto err_in;
 147         }
 148
 149         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 150         (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
 151
 152         if ((MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1) &&
 153              is_xrc){
 154                 xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in,
 155                                      xrc_srq_context_entry);
 156                 MLX5_SET(xrc_srqc, xsrqc, user_index, uidx);
 157         }
 158
 159         return 0;
 160
 161 err_in:
 162         kvfree(*in);
 163
 164 err_umem:
 165         ib_umem_release(srq->umem);
 166
 167         return err;
 168 }
 169
 170 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 171                              struct mlx5_create_srq_mbox_in **in, int buf_size,
 172                              int *inlen, int is_xrc)
 173 {
 174         int err;
 175         int i;
 176         struct mlx5_wqe_srq_next_seg *next;
 177         int page_shift;
 178         int npages;
 179         void *xsrqc;
 180
 181         err = mlx5_db_alloc(dev->mdev, &srq->db);
 182         if (err) {
 183                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 184                 return err;
 185         }
 186
 187         if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
 188                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 189                 err = -ENOMEM;
 190                 goto err_db;
 191         }
 192         page_shift = srq->buf.page_shift;
 193
 194         srq->head    = 0;
 195         srq->tail    = srq->msrq.max - 1;
 196         srq->wqe_ctr = 0;
 197
 198         for (i = 0; i < srq->msrq.max; i++) {
 199                 next = get_wqe(srq, i);
 200                 next->next_wqe_index =
 201                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 202         }
 203
 204         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 205         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 206                     buf_size, page_shift, srq->buf.npages, npages);
 207         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
 208         *in = mlx5_vzalloc(*inlen);
 209         if (!*in) {
 210                 err = -ENOMEM;
 211                 goto err_buf;
 212         }
 213         mlx5_fill_page_array(&srq->buf, (*in)->pas);
 214
 215         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 216         if (!srq->wrid) {
 217                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 218                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 219                 err = -ENOMEM;
 220                 goto err_in;
 221         }
 222         srq->wq_sig = !!srq_signature;
 223
 224         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 225
 226         if ((MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1) &&
 227              is_xrc){
 228                 xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in,
 229                                      xrc_srq_context_entry);
 230                 /* 0xffffff means we ask to work with cqe version 0 */
 231                 MLX5_SET(xrc_srqc, xsrqc, user_index, MLX5_IB_DEFAULT_UIDX);
 232         }
 233
 234         return 0;
 235
 236 err_in:
 237         kvfree(*in);
 238
 239 err_buf:
 240         mlx5_buf_free(dev->mdev, &srq->buf);
 241
 242 err_db:
 243         mlx5_db_free(dev->mdev, &srq->db);
 244         return err;
 245 }
 246
 247 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 248 {
 249         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 250         ib_umem_release(srq->umem);
 251 }
 252
 253
 254 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 255 {
 256         kfree(srq->wrid);
 257         mlx5_buf_free(dev->mdev, &srq->buf);
 258         mlx5_db_free(dev->mdev, &srq->db);
 259 }
 260
 261 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 262                                   struct ib_srq_init_attr *init_attr,
 263                                   struct ib_udata *udata)
 264 {
 265         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 266         struct mlx5_ib_srq *srq;
 267         int desc_size;
 268         int buf_size;
 269         int err;
 270         struct mlx5_create_srq_mbox_in *uninitialized_var(in);
 271         int uninitialized_var(inlen);
 272         int is_xrc;
 273         u32 flgs, xrcdn;
 274         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 275
 276         /* Sanity check SRQ size before proceeding */
 277         if (init_attr->attr.max_wr >= max_srq_wqes) {
 278                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 279                             init_attr->attr.max_wr,
 280                             max_srq_wqes);
 281                 return ERR_PTR(-EINVAL);
 282         }
 283
 284         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 285         if (!srq)
 286                 return ERR_PTR(-ENOMEM);
 287
 288         mutex_init(&srq->mutex);
 289         spin_lock_init(&srq->lock);
 290         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 291         srq->msrq.max_gs = init_attr->attr.max_sge;
 292
 293         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 294                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 295         desc_size = roundup_pow_of_two(desc_size);
 296         desc_size = max_t(int, 32, desc_size);
 297         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 298                 sizeof(struct mlx5_wqe_data_seg);
 299         srq->msrq.wqe_shift = ilog2(desc_size);
 300         buf_size = srq->msrq.max * desc_size;
 301         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",
 302                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 303                     srq->msrq.max_avail_gather);
 304
 305         is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
 306
 307         if (pd->uobject)
 308                 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen,
 309                                       is_xrc);
 310         else
 311                 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen,
 312                                         is_xrc);
 313
 314         if (err) {
 315                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 316                              pd->uobject ? "user" : "kernel", err);
 317                 goto err_srq;
 318         }
 319
 320         in->ctx.state_log_sz = ilog2(srq->msrq.max);
 321         flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
 322         xrcdn = 0;
 323         if (is_xrc) {
 324                 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 325                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
 326         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 327                 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
 328                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
 329         }
 330
 331         in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
 332
 333         in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
 334         in->ctx.db_record = cpu_to_be64(srq->db.dma);
 335         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc);
 336         kvfree(in);
 337         if (err) {
 338                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 339                 goto err_usr_kern_srq;
 340         }
 341
 342         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 343
 344         srq->msrq.event = mlx5_ib_srq_event;
 345         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 346
 347         if (pd->uobject)
 348                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 349                         mlx5_ib_dbg(dev, "copy to user failed\n");
 350                         err = -EFAULT;
 351                         goto err_core;
 352                 }
 353
 354         init_attr->attr.max_wr = srq->msrq.max - 1;
 355
 356         return &srq->ibsrq;
 357
 358 err_core:
 359         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 360
 361 err_usr_kern_srq:
 362         if (pd->uobject)
 363                 destroy_srq_user(pd, srq);
 364         else
 365                 destroy_srq_kernel(dev, srq);
 366
 367 err_srq:
 368         kfree(srq);
 369
 370         return ERR_PTR(err);
 371 }
 372
 373 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 374                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 375 {
 376         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 377         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 378         int ret;
 379
 380         /* We don't support resizing SRQs yet */
 381         if (attr_mask & IB_SRQ_MAX_WR)
 382                 return -EINVAL;
 383
 384         if (attr_mask & IB_SRQ_LIMIT) {
 385                 if (attr->srq_limit >= srq->msrq.max)
 386                         return -EINVAL;
 387
 388                 mutex_lock(&srq->mutex);
 389                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 390                 mutex_unlock(&srq->mutex);
 391
 392                 if (ret)
 393                         return ret;
 394         }
 395
 396         return 0;
 397 }
 398
 399 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 400 {
 401         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 402         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 403         int ret;
 404         struct mlx5_query_srq_mbox_out *out;
 405
 406         out = kzalloc(sizeof(*out), GFP_KERNEL);
 407         if (!out)
 408                 return -ENOMEM;
 409
 410         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 411         if (ret)
 412                 goto out_box;
 413
 414         srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
 415         srq_attr->max_wr    = srq->msrq.max - 1;
 416         srq_attr->max_sge   = srq->msrq.max_gs;
 417
 418 out_box:
 419         kfree(out);
 420         return ret;
 421 }
 422
 423 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 424 {
 425         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 426         struct mlx5_ib_srq *msrq = to_msrq(srq);
 427
 428         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 429
 430         if (srq->uobject) {
 431                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 432                 ib_umem_release(msrq->umem);
 433         } else {
 434                 destroy_srq_kernel(dev, msrq);
 435         }
 436
 437         kfree(srq);
 438         return 0;
 439 }
 440
 441 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 442 {
 443         struct mlx5_wqe_srq_next_seg *next;
 444
 445         /* always called with interrupts disabled. */
 446         spin_lock(&srq->lock);
 447
 448         next = get_wqe(srq, srq->tail);
 449         next->next_wqe_index = cpu_to_be16(wqe_index);
 450         srq->tail = wqe_index;
 451
 452         spin_unlock(&srq->lock);
 453 }
 454
 455 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 456                           struct ib_recv_wr **bad_wr)
 457 {
 458         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 459         struct mlx5_wqe_srq_next_seg *next;
 460         struct mlx5_wqe_data_seg *scat;
 461         unsigned long flags;
 462         int err = 0;
 463         int nreq;
 464         int i;
 465
 466         spin_lock_irqsave(&srq->lock, flags);
 467
 468         for (nreq = 0; wr; nreq++, wr = wr->next) {
 469                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 470                         err = -EINVAL;
 471                         *bad_wr = wr;
 472                         break;
 473                 }
 474
 475                 if (unlikely(srq->head == srq->tail)) {
 476                         err = -ENOMEM;
 477                         *bad_wr = wr;
 478                         break;
 479                 }
 480
 481                 srq->wrid[srq->head] = wr->wr_id;
 482
 483                 next      = get_wqe(srq, srq->head);
 484                 srq->head = be16_to_cpu(next->next_wqe_index);
 485                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 486
 487                 for (i = 0; i < wr->num_sge; i++) {
 488                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 489                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 490                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 491                 }
 492
 493                 if (i < srq->msrq.max_avail_gather) {
 494                         scat[i].byte_count = 0;
 495                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 496                         scat[i].addr       = 0;
 497                 }
 498         }
 499
 500         if (likely(nreq)) {
 501                 srq->wqe_ctr += nreq;
 502
 503                 /* Make sure that descriptors are written before
 504                  * doorbell record.
 505                  */
 506                 wmb();
 507
 508                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 509         }
 510
 511         spin_unlock_irqrestore(&srq->lock, flags);
 512
 513         return err;
 514 }