drivers/infiniband/hw/mlx5/srq.c

   1 /*
   2  * Copyright (c) 2013, Mellanox Technologies inc.  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
  39 #include "mlx5_ib.h"
  40 #include "user.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_create_srq_mbox_in **in,
  77                            struct ib_udata *udata, int buf_size, int *inlen)
  78 {
  79         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  80         struct mlx5_ib_create_srq ucmd;
  81         int err;
  82         int npages;
  83         int page_shift;
  84         int ncont;
  85         u32 offset;
  86
  87         if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
  88                 mlx5_ib_dbg(dev, "failed copy udata\n");
  89                 return -EFAULT;
  90         }
  91         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
  92
  93         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
  94                                 0, 0);
  95         if (IS_ERR(srq->umem)) {
  96                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
  97                 err = PTR_ERR(srq->umem);
  98                 return err;
  99         }
 100
 101         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 102                            &page_shift, &ncont, NULL);
 103         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 104                                      &offset);
 105         if (err) {
 106                 mlx5_ib_warn(dev, "bad offset\n");
 107                 goto err_umem;
 108         }
 109
 110         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
 111         *in = mlx5_vzalloc(*inlen);
 112         if (!(*in)) {
 113                 err = -ENOMEM;
 114                 goto err_umem;
 115         }
 116
 117         mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
 118
 119         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 120                                   ucmd.db_addr, &srq->db);
 121         if (err) {
 122                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 123                 goto err_in;
 124         }
 125
 126         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 127         (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
 128
 129         return 0;
 130
 131 err_in:
 132         mlx5_vfree(*in);
 133
 134 err_umem:
 135         ib_umem_release(srq->umem);
 136
 137         return err;
 138 }
 139
 140 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 141                              struct mlx5_create_srq_mbox_in **in, int buf_size,
 142                              int *inlen)
 143 {
 144         int err;
 145         int i;
 146         struct mlx5_wqe_srq_next_seg *next;
 147         int page_shift;
 148         int npages;
 149
 150         err = mlx5_db_alloc(&dev->mdev, &srq->db);
 151         if (err) {
 152                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 153                 return err;
 154         }
 155
 156         *srq->db.db = 0;
 157
 158         if (mlx5_buf_alloc(&dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
 159                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 160                 err = -ENOMEM;
 161                 goto err_db;
 162         }
 163         page_shift = srq->buf.page_shift;
 164
 165         srq->head    = 0;
 166         srq->tail    = srq->msrq.max - 1;
 167         srq->wqe_ctr = 0;
 168
 169         for (i = 0; i < srq->msrq.max; i++) {
 170                 next = get_wqe(srq, i);
 171                 next->next_wqe_index =
 172                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 173         }
 174
 175         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 176         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 177                     buf_size, page_shift, srq->buf.npages, npages);
 178         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
 179         *in = mlx5_vzalloc(*inlen);
 180         if (!*in) {
 181                 err = -ENOMEM;
 182                 goto err_buf;
 183         }
 184         mlx5_fill_page_array(&srq->buf, (*in)->pas);
 185
 186         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 187         if (!srq->wrid) {
 188                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 189                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 190                 err = -ENOMEM;
 191                 goto err_in;
 192         }
 193         srq->wq_sig = !!srq_signature;
 194
 195         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 196
 197         return 0;
 198
 199 err_in:
 200         mlx5_vfree(*in);
 201
 202 err_buf:
 203         mlx5_buf_free(&dev->mdev, &srq->buf);
 204
 205 err_db:
 206         mlx5_db_free(&dev->mdev, &srq->db);
 207         return err;
 208 }
 209
 210 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 211 {
 212         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 213         ib_umem_release(srq->umem);
 214 }
 215
 216
 217 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 218 {
 219         kfree(srq->wrid);
 220         mlx5_buf_free(&dev->mdev, &srq->buf);
 221         mlx5_db_free(&dev->mdev, &srq->db);
 222 }
 223
 224 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 225                                   struct ib_srq_init_attr *init_attr,
 226                                   struct ib_udata *udata)
 227 {
 228         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 229         struct mlx5_ib_srq *srq;
 230         int desc_size;
 231         int buf_size;
 232         int err;
 233         struct mlx5_create_srq_mbox_in *uninitialized_var(in);
 234         int uninitialized_var(inlen);
 235         int is_xrc;
 236         u32 flgs, xrcdn;
 237
 238         /* Sanity check SRQ size before proceeding */
 239         if (init_attr->attr.max_wr >= dev->mdev.caps.max_srq_wqes) {
 240                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 241                             init_attr->attr.max_wr,
 242                             dev->mdev.caps.max_srq_wqes);
 243                 return ERR_PTR(-EINVAL);
 244         }
 245
 246         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 247         if (!srq)
 248                 return ERR_PTR(-ENOMEM);
 249
 250         mutex_init(&srq->mutex);
 251         spin_lock_init(&srq->lock);
 252         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 253         srq->msrq.max_gs = init_attr->attr.max_sge;
 254
 255         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 256                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 257         desc_size = roundup_pow_of_two(desc_size);
 258         desc_size = max_t(int, 32, desc_size);
 259         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 260                 sizeof(struct mlx5_wqe_data_seg);
 261         srq->msrq.wqe_shift = ilog2(desc_size);
 262         buf_size = srq->msrq.max * desc_size;
 263         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",
 264                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 265                     srq->msrq.max_avail_gather);
 266
 267         if (pd->uobject)
 268                 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
 269         else
 270                 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);
 271
 272         if (err) {
 273                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 274                              pd->uobject ? "user" : "kernel", err);
 275                 goto err_srq;
 276         }
 277
 278         is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
 279         in->ctx.state_log_sz = ilog2(srq->msrq.max);
 280         flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
 281         xrcdn = 0;
 282         if (is_xrc) {
 283                 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 284                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
 285         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 286                 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
 287                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
 288         }
 289
 290         in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
 291
 292         in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
 293         in->ctx.db_record = cpu_to_be64(srq->db.dma);
 294         err = mlx5_core_create_srq(&dev->mdev, &srq->msrq, in, inlen);
 295         mlx5_vfree(in);
 296         if (err) {
 297                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 298                 goto err_usr_kern_srq;
 299         }
 300
 301         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 302
 303         srq->msrq.event = mlx5_ib_srq_event;
 304         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 305
 306         if (pd->uobject)
 307                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 308                         mlx5_ib_dbg(dev, "copy to user failed\n");
 309                         err = -EFAULT;
 310                         goto err_core;
 311                 }
 312
 313         init_attr->attr.max_wr = srq->msrq.max - 1;
 314
 315         return &srq->ibsrq;
 316
 317 err_core:
 318         mlx5_core_destroy_srq(&dev->mdev, &srq->msrq);
 319
 320 err_usr_kern_srq:
 321         if (pd->uobject)
 322                 destroy_srq_user(pd, srq);
 323         else
 324                 destroy_srq_kernel(dev, srq);
 325
 326 err_srq:
 327         kfree(srq);
 328
 329         return ERR_PTR(err);
 330 }
 331
 332 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 333                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 334 {
 335         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 336         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 337         int ret;
 338
 339         /* We don't support resizing SRQs yet */
 340         if (attr_mask & IB_SRQ_MAX_WR)
 341                 return -EINVAL;
 342
 343         if (attr_mask & IB_SRQ_LIMIT) {
 344                 if (attr->srq_limit >= srq->msrq.max)
 345                         return -EINVAL;
 346
 347                 mutex_lock(&srq->mutex);
 348                 ret = mlx5_core_arm_srq(&dev->mdev, &srq->msrq, attr->srq_limit, 1);
 349                 mutex_unlock(&srq->mutex);
 350
 351                 if (ret)
 352                         return ret;
 353         }
 354
 355         return 0;
 356 }
 357
 358 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 359 {
 360         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 361         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 362         int ret;
 363         struct mlx5_query_srq_mbox_out *out;
 364
 365         out = kzalloc(sizeof(*out), GFP_KERNEL);
 366         if (!out)
 367                 return -ENOMEM;
 368
 369         ret = mlx5_core_query_srq(&dev->mdev, &srq->msrq, out);
 370         if (ret)
 371                 goto out_box;
 372
 373         srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
 374         srq_attr->max_wr    = srq->msrq.max - 1;
 375         srq_attr->max_sge   = srq->msrq.max_gs;
 376
 377 out_box:
 378         kfree(out);
 379         return ret;
 380 }
 381
 382 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 383 {
 384         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 385         struct mlx5_ib_srq *msrq = to_msrq(srq);
 386
 387         mlx5_core_destroy_srq(&dev->mdev, &msrq->msrq);
 388
 389         if (srq->uobject) {
 390                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 391                 ib_umem_release(msrq->umem);
 392         } else {
 393                 destroy_srq_kernel(dev, msrq);
 394         }
 395
 396         kfree(srq);
 397         return 0;
 398 }
 399
 400 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 401 {
 402         struct mlx5_wqe_srq_next_seg *next;
 403
 404         /* always called with interrupts disabled. */
 405         spin_lock(&srq->lock);
 406
 407         next = get_wqe(srq, srq->tail);
 408         next->next_wqe_index = cpu_to_be16(wqe_index);
 409         srq->tail = wqe_index;
 410
 411         spin_unlock(&srq->lock);
 412 }
 413
 414 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 415                           struct ib_recv_wr **bad_wr)
 416 {
 417         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 418         struct mlx5_wqe_srq_next_seg *next;
 419         struct mlx5_wqe_data_seg *scat;
 420         unsigned long flags;
 421         int err = 0;
 422         int nreq;
 423         int i;
 424
 425         spin_lock_irqsave(&srq->lock, flags);
 426
 427         for (nreq = 0; wr; nreq++, wr = wr->next) {
 428                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 429                         err = -EINVAL;
 430                         *bad_wr = wr;
 431                         break;
 432                 }
 433
 434                 if (unlikely(srq->head == srq->tail)) {
 435                         err = -ENOMEM;
 436                         *bad_wr = wr;
 437                         break;
 438                 }
 439
 440                 srq->wrid[srq->head] = wr->wr_id;
 441
 442                 next      = get_wqe(srq, srq->head);
 443                 srq->head = be16_to_cpu(next->next_wqe_index);
 444                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 445
 446                 for (i = 0; i < wr->num_sge; i++) {
 447                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 448                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 449                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 450                 }
 451
 452                 if (i < srq->msrq.max_avail_gather) {
 453                         scat[i].byte_count = 0;
 454                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 455                         scat[i].addr       = 0;
 456                 }
 457         }
 458
 459         if (likely(nreq)) {
 460                 srq->wqe_ctr += nreq;
 461
 462                 /* Make sure that descriptors are written before
 463                  * doorbell record.
 464                  */
 465                 wmb();
 466
 467                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 468         }
 469
 470         spin_unlock_irqrestore(&srq->lock, flags);
 471
 472         return err;
 473 }