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 {
  80         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  81         struct mlx5_ib_create_srq ucmd = {};
  82         size_t ucmdlen;
  83         void *xsrqc;
  84         int err;
  85         int npages;
  86         int page_shift;
  87         int ncont;
  88         u32 offset;
  89         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  90         int drv_data = udata->inlen - sizeof(struct ib_uverbs_cmd_hdr);
  91
  92         if (drv_data < 0)
  93                 return -EINVAL;
  94
  95         ucmdlen = (drv_data < sizeof(ucmd)) ?
  96                   drv_data : sizeof(ucmd);
  97
  98         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  99                 mlx5_ib_dbg(dev, "failed copy udata\n");
 100                 return -EFAULT;
 101         }
 102
 103         if (ucmd.reserved0 || ucmd.reserved1)
 104                 return -EINVAL;
 105
 106         if (drv_data > sizeof(ucmd) &&
 107             !ib_is_udata_cleared(udata, sizeof(ucmd),
 108                                  drv_data - sizeof(ucmd)))
 109                 return -EINVAL;
 110
 111         err = get_srq_user_index(to_mucontext(pd->uobject->context),
 112                                  &ucmd, udata->inlen, &uidx);
 113         if (err)
 114                 return err;
 115
 116         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 117
 118         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 119                                 0, 0);
 120         if (IS_ERR(srq->umem)) {
 121                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 122                 err = PTR_ERR(srq->umem);
 123                 return err;
 124         }
 125
 126         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 127                            &page_shift, &ncont, NULL);
 128         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 129                                      &offset);
 130         if (err) {
 131                 mlx5_ib_warn(dev, "bad offset\n");
 132                 goto err_umem;
 133         }
 134
 135         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
 136         *in = mlx5_vzalloc(*inlen);
 137         if (!(*in)) {
 138                 err = -ENOMEM;
 139                 goto err_umem;
 140         }
 141
 142         mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
 143
 144         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 145                                   ucmd.db_addr, &srq->db);
 146         if (err) {
 147                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 148                 goto err_in;
 149         }
 150
 151         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 152         (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
 153
 154         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1) {
 155                 xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in,
 156                                      xrc_srq_context_entry);
 157                 MLX5_SET(xrc_srqc, xsrqc, user_index, uidx);
 158         }
 159
 160         return 0;
 161
 162 err_in:
 163         kvfree(*in);
 164
 165 err_umem:
 166         ib_umem_release(srq->umem);
 167
 168         return err;
 169 }
 170
 171 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 172                              struct mlx5_create_srq_mbox_in **in, int buf_size,
 173                              int *inlen)
 174 {
 175         int err;
 176         int i;
 177         struct mlx5_wqe_srq_next_seg *next;
 178         int page_shift;
 179         int npages;
 180         void *xsrqc;
 181
 182         err = mlx5_db_alloc(dev->mdev, &srq->db);
 183         if (err) {
 184                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 185                 return err;
 186         }
 187
 188         if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
 189                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 190                 err = -ENOMEM;
 191                 goto err_db;
 192         }
 193         page_shift = srq->buf.page_shift;
 194
 195         srq->head    = 0;
 196         srq->tail    = srq->msrq.max - 1;
 197         srq->wqe_ctr = 0;
 198
 199         for (i = 0; i < srq->msrq.max; i++) {
 200                 next = get_wqe(srq, i);
 201                 next->next_wqe_index =
 202                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 203         }
 204
 205         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 206         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 207                     buf_size, page_shift, srq->buf.npages, npages);
 208         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
 209         *in = mlx5_vzalloc(*inlen);
 210         if (!*in) {
 211                 err = -ENOMEM;
 212                 goto err_buf;
 213         }
 214         mlx5_fill_page_array(&srq->buf, (*in)->pas);
 215
 216         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 217         if (!srq->wrid) {
 218                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 219                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 220                 err = -ENOMEM;
 221                 goto err_in;
 222         }
 223         srq->wq_sig = !!srq_signature;
 224
 225         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 226
 227         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1) {
 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         if (pd->uobject)
 306                 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
 307         else
 308                 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);
 309
 310         if (err) {
 311                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 312                              pd->uobject ? "user" : "kernel", err);
 313                 goto err_srq;
 314         }
 315
 316         is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
 317         in->ctx.state_log_sz = ilog2(srq->msrq.max);
 318         flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
 319         xrcdn = 0;
 320         if (is_xrc) {
 321                 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 322                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
 323         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 324                 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
 325                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
 326         }
 327
 328         in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
 329
 330         in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
 331         in->ctx.db_record = cpu_to_be64(srq->db.dma);
 332         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc);
 333         kvfree(in);
 334         if (err) {
 335                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 336                 goto err_usr_kern_srq;
 337         }
 338
 339         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 340
 341         srq->msrq.event = mlx5_ib_srq_event;
 342         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 343
 344         if (pd->uobject)
 345                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 346                         mlx5_ib_dbg(dev, "copy to user failed\n");
 347                         err = -EFAULT;
 348                         goto err_core;
 349                 }
 350
 351         init_attr->attr.max_wr = srq->msrq.max - 1;
 352
 353         return &srq->ibsrq;
 354
 355 err_core:
 356         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 357
 358 err_usr_kern_srq:
 359         if (pd->uobject)
 360                 destroy_srq_user(pd, srq);
 361         else
 362                 destroy_srq_kernel(dev, srq);
 363
 364 err_srq:
 365         kfree(srq);
 366
 367         return ERR_PTR(err);
 368 }
 369
 370 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 371                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 372 {
 373         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 374         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 375         int ret;
 376
 377         /* We don't support resizing SRQs yet */
 378         if (attr_mask & IB_SRQ_MAX_WR)
 379                 return -EINVAL;
 380
 381         if (attr_mask & IB_SRQ_LIMIT) {
 382                 if (attr->srq_limit >= srq->msrq.max)
 383                         return -EINVAL;
 384
 385                 mutex_lock(&srq->mutex);
 386                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 387                 mutex_unlock(&srq->mutex);
 388
 389                 if (ret)
 390                         return ret;
 391         }
 392
 393         return 0;
 394 }
 395
 396 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 397 {
 398         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 399         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 400         int ret;
 401         struct mlx5_query_srq_mbox_out *out;
 402
 403         out = kzalloc(sizeof(*out), GFP_KERNEL);
 404         if (!out)
 405                 return -ENOMEM;
 406
 407         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 408         if (ret)
 409                 goto out_box;
 410
 411         srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
 412         srq_attr->max_wr    = srq->msrq.max - 1;
 413         srq_attr->max_sge   = srq->msrq.max_gs;
 414
 415 out_box:
 416         kfree(out);
 417         return ret;
 418 }
 419
 420 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 421 {
 422         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 423         struct mlx5_ib_srq *msrq = to_msrq(srq);
 424
 425         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 426
 427         if (srq->uobject) {
 428                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 429                 ib_umem_release(msrq->umem);
 430         } else {
 431                 destroy_srq_kernel(dev, msrq);
 432         }
 433
 434         kfree(srq);
 435         return 0;
 436 }
 437
 438 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 439 {
 440         struct mlx5_wqe_srq_next_seg *next;
 441
 442         /* always called with interrupts disabled. */
 443         spin_lock(&srq->lock);
 444
 445         next = get_wqe(srq, srq->tail);
 446         next->next_wqe_index = cpu_to_be16(wqe_index);
 447         srq->tail = wqe_index;
 448
 449         spin_unlock(&srq->lock);
 450 }
 451
 452 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 453                           struct ib_recv_wr **bad_wr)
 454 {
 455         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 456         struct mlx5_wqe_srq_next_seg *next;
 457         struct mlx5_wqe_data_seg *scat;
 458         unsigned long flags;
 459         int err = 0;
 460         int nreq;
 461         int i;
 462
 463         spin_lock_irqsave(&srq->lock, flags);
 464
 465         for (nreq = 0; wr; nreq++, wr = wr->next) {
 466                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 467                         err = -EINVAL;
 468                         *bad_wr = wr;
 469                         break;
 470                 }
 471
 472                 if (unlikely(srq->head == srq->tail)) {
 473                         err = -ENOMEM;
 474                         *bad_wr = wr;
 475                         break;
 476                 }
 477
 478                 srq->wrid[srq->head] = wr->wr_id;
 479
 480                 next      = get_wqe(srq, srq->head);
 481                 srq->head = be16_to_cpu(next->next_wqe_index);
 482                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 483
 484                 for (i = 0; i < wr->num_sge; i++) {
 485                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 486                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 487                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 488                 }
 489
 490                 if (i < srq->msrq.max_avail_gather) {
 491                         scat[i].byte_count = 0;
 492                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 493                         scat[i].addr       = 0;
 494                 }
 495         }
 496
 497         if (likely(nreq)) {
 498                 srq->wqe_ctr += nreq;
 499
 500                 /* Make sure that descriptors are written before
 501                  * doorbell record.
 502                  */
 503                 wmb();
 504
 505                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 506         }
 507
 508         spin_unlock_irqrestore(&srq->lock, flags);
 509
 510         return err;
 511 }