drivers/infiniband/hw/ipath/ipath_srq.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/err.h>
  35 #include <linux/vmalloc.h>
  36
  37 #include "ipath_verbs.h"
  38
  39 /**
  40  * ipath_post_srq_receive - post a receive on a shared receive queue
  41  * @ibsrq: the SRQ to post the receive on
  42  * @wr: the list of work requests to post
  43  * @bad_wr: the first WR to cause a problem is put here
  44  *
  45  * This may be called from interrupt context.
  46  */
  47 int ipath_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
  48                            struct ib_recv_wr **bad_wr)
  49 {
  50         struct ipath_srq *srq = to_isrq(ibsrq);
  51         struct ipath_rwq *wq;
  52         unsigned long flags;
  53         int ret;
  54
  55         for (; wr; wr = wr->next) {
  56                 struct ipath_rwqe *wqe;
  57                 u32 next;
  58                 int i;
  59
  60                 if ((unsigned) wr->num_sge > srq->rq.max_sge) {
  61                         *bad_wr = wr;
  62                         ret = -ENOMEM;
  63                         goto bail;
  64                 }
  65
  66                 spin_lock_irqsave(&srq->rq.lock, flags);
  67                 wq = srq->rq.wq;
  68                 next = wq->head + 1;
  69                 if (next >= srq->rq.size)
  70                         next = 0;
  71                 if (next == wq->tail) {
  72                         spin_unlock_irqrestore(&srq->rq.lock, flags);
  73                         *bad_wr = wr;
  74                         ret = -ENOMEM;
  75                         goto bail;
  76                 }
  77
  78                 wqe = get_rwqe_ptr(&srq->rq, wq->head);
  79                 wqe->wr_id = wr->wr_id;
  80                 wqe->num_sge = wr->num_sge;
  81                 for (i = 0; i < wr->num_sge; i++)
  82                         wqe->sg_list[i] = wr->sg_list[i];
  83                 wq->head = next;
  84                 spin_unlock_irqrestore(&srq->rq.lock, flags);
  85         }
  86         ret = 0;
  87
  88 bail:
  89         return ret;
  90 }
  91
  92 /**
  93  * ipath_create_srq - create a shared receive queue
  94  * @ibpd: the protection domain of the SRQ to create
  95  * @attr: the attributes of the SRQ
  96  * @udata: not used by the InfiniPath verbs driver
  97  */
  98 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
  99                                 struct ib_srq_init_attr *srq_init_attr,
 100                                 struct ib_udata *udata)
 101 {
 102         struct ipath_ibdev *dev = to_idev(ibpd->device);
 103         struct ipath_srq *srq;
 104         u32 sz;
 105         struct ib_srq *ret;
 106
 107         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
 108                 ret = ERR_PTR(-ENOMEM);
 109                 goto done;
 110         }
 111
 112         if (srq_init_attr->attr.max_wr == 0) {
 113                 ret = ERR_PTR(-EINVAL);
 114                 goto done;
 115         }
 116
 117         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
 118             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
 119                 ret = ERR_PTR(-EINVAL);
 120                 goto done;
 121         }
 122
 123         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 124         if (!srq) {
 125                 ret = ERR_PTR(-ENOMEM);
 126                 goto done;
 127         }
 128
 129         /*
 130          * Need to use vmalloc() if we want to support large #s of entries.
 131          */
 132         srq->rq.size = srq_init_attr->attr.max_wr + 1;
 133         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 134         sz = sizeof(struct ib_sge) * srq->rq.max_sge +
 135                 sizeof(struct ipath_rwqe);
 136         srq->rq.wq = vmalloc_user(sizeof(struct ipath_rwq) + srq->rq.size * sz);
 137         if (!srq->rq.wq) {
 138                 ret = ERR_PTR(-ENOMEM);
 139                 goto bail_srq;
 140         }
 141
 142         /*
 143          * Return the address of the RWQ as the offset to mmap.
 144          * See ipath_mmap() for details.
 145          */
 146         if (udata && udata->outlen >= sizeof(__u64)) {
 147                 struct ipath_mmap_info *ip;
 148                 __u64 offset = (__u64) srq->rq.wq;
 149                 int err;
 150
 151                 err = ib_copy_to_udata(udata, &offset, sizeof(offset));
 152                 if (err) {
 153                         ret = ERR_PTR(err);
 154                         goto bail_wq;
 155                 }
 156
 157                 /* Allocate info for ipath_mmap(). */
 158                 ip = kmalloc(sizeof(*ip), GFP_KERNEL);
 159                 if (!ip) {
 160                         ret = ERR_PTR(-ENOMEM);
 161                         goto bail_wq;
 162                 }
 163                 srq->ip = ip;
 164                 ip->context = ibpd->uobject->context;
 165                 ip->obj = srq->rq.wq;
 166                 kref_init(&ip->ref);
 167                 ip->mmap_cnt = 0;
 168                 ip->size = PAGE_ALIGN(sizeof(struct ipath_rwq) +
 169                                       srq->rq.size * sz);
 170                 spin_lock_irq(&dev->pending_lock);
 171                 ip->next = dev->pending_mmaps;
 172                 dev->pending_mmaps = ip;
 173                 spin_unlock_irq(&dev->pending_lock);
 174         } else
 175                 srq->ip = NULL;
 176
 177         /*
 178          * ib_create_srq() will initialize srq->ibsrq.
 179          */
 180         spin_lock_init(&srq->rq.lock);
 181         srq->rq.wq->head = 0;
 182         srq->rq.wq->tail = 0;
 183         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 184         srq->limit = srq_init_attr->attr.srq_limit;
 185
 186         dev->n_srqs_allocated++;
 187
 188         ret = &srq->ibsrq;
 189         goto done;
 190
 191 bail_wq:
 192         vfree(srq->rq.wq);
 193
 194 bail_srq:
 195         kfree(srq);
 196
 197 done:
 198         return ret;
 199 }
 200
 201 /**
 202  * ipath_modify_srq - modify a shared receive queue
 203  * @ibsrq: the SRQ to modify
 204  * @attr: the new attributes of the SRQ
 205  * @attr_mask: indicates which attributes to modify
 206  * @udata: user data for ipathverbs.so
 207  */
 208 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 209                      enum ib_srq_attr_mask attr_mask,
 210                      struct ib_udata *udata)
 211 {
 212         struct ipath_srq *srq = to_isrq(ibsrq);
 213         int ret = 0;
 214
 215         if (attr_mask & IB_SRQ_MAX_WR) {
 216                 struct ipath_rwq *owq;
 217                 struct ipath_rwq *wq;
 218                 struct ipath_rwqe *p;
 219                 u32 sz, size, n, head, tail;
 220
 221                 /* Check that the requested sizes are below the limits. */
 222                 if ((attr->max_wr > ib_ipath_max_srq_wrs) ||
 223                     ((attr_mask & IB_SRQ_LIMIT) ?
 224                      attr->srq_limit : srq->limit) > attr->max_wr) {
 225                         ret = -EINVAL;
 226                         goto bail;
 227                 }
 228
 229                 sz = sizeof(struct ipath_rwqe) +
 230                         srq->rq.max_sge * sizeof(struct ib_sge);
 231                 size = attr->max_wr + 1;
 232                 wq = vmalloc_user(sizeof(struct ipath_rwq) + size * sz);
 233                 if (!wq) {
 234                         ret = -ENOMEM;
 235                         goto bail;
 236                 }
 237
 238                 /*
 239                  * Return the address of the RWQ as the offset to mmap.
 240                  * See ipath_mmap() for details.
 241                  */
 242                 if (udata && udata->inlen >= sizeof(__u64)) {
 243                         __u64 offset_addr;
 244                         __u64 offset = (__u64) wq;
 245
 246                         ret = ib_copy_from_udata(&offset_addr, udata,
 247                                                  sizeof(offset_addr));
 248                         if (ret) {
 249                                 vfree(wq);
 250                                 goto bail;
 251                         }
 252                         udata->outbuf = (void __user *) offset_addr;
 253                         ret = ib_copy_to_udata(udata, &offset,
 254                                                sizeof(offset));
 255                         if (ret) {
 256                                 vfree(wq);
 257                                 goto bail;
 258                         }
 259                 }
 260
 261                 spin_lock_irq(&srq->rq.lock);
 262                 /*
 263                  * validate head pointer value and compute
 264                  * the number of remaining WQEs.
 265                  */
 266                 owq = srq->rq.wq;
 267                 head = owq->head;
 268                 if (head >= srq->rq.size)
 269                         head = 0;
 270                 tail = owq->tail;
 271                 if (tail >= srq->rq.size)
 272                         tail = 0;
 273                 n = head;
 274                 if (n < tail)
 275                         n += srq->rq.size - tail;
 276                 else
 277                         n -= tail;
 278                 if (size <= n) {
 279                         spin_unlock_irq(&srq->rq.lock);
 280                         vfree(wq);
 281                         ret = -EINVAL;
 282                         goto bail;
 283                 }
 284                 n = 0;
 285                 p = wq->wq;
 286                 while (tail != head) {
 287                         struct ipath_rwqe *wqe;
 288                         int i;
 289
 290                         wqe = get_rwqe_ptr(&srq->rq, tail);
 291                         p->wr_id = wqe->wr_id;
 292                         p->num_sge = wqe->num_sge;
 293                         for (i = 0; i < wqe->num_sge; i++)
 294                                 p->sg_list[i] = wqe->sg_list[i];
 295                         n++;
 296                         p = (struct ipath_rwqe *)((char *) p + sz);
 297                         if (++tail >= srq->rq.size)
 298                                 tail = 0;
 299                 }
 300                 srq->rq.wq = wq;
 301                 srq->rq.size = size;
 302                 wq->head = n;
 303                 wq->tail = 0;
 304                 if (attr_mask & IB_SRQ_LIMIT)
 305                         srq->limit = attr->srq_limit;
 306                 spin_unlock_irq(&srq->rq.lock);
 307
 308                 vfree(owq);
 309
 310                 if (srq->ip) {
 311                         struct ipath_mmap_info *ip = srq->ip;
 312                         struct ipath_ibdev *dev = to_idev(srq->ibsrq.device);
 313
 314                         ip->obj = wq;
 315                         ip->size = PAGE_ALIGN(sizeof(struct ipath_rwq) +
 316                                               size * sz);
 317                         spin_lock_irq(&dev->pending_lock);
 318                         ip->next = dev->pending_mmaps;
 319                         dev->pending_mmaps = ip;
 320                         spin_unlock_irq(&dev->pending_lock);
 321                 }
 322         } else if (attr_mask & IB_SRQ_LIMIT) {
 323                 spin_lock_irq(&srq->rq.lock);
 324                 if (attr->srq_limit >= srq->rq.size)
 325                         ret = -EINVAL;
 326                 else
 327                         srq->limit = attr->srq_limit;
 328                 spin_unlock_irq(&srq->rq.lock);
 329         }
 330
 331 bail:
 332         return ret;
 333 }
 334
 335 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 336 {
 337         struct ipath_srq *srq = to_isrq(ibsrq);
 338
 339         attr->max_wr = srq->rq.size - 1;
 340         attr->max_sge = srq->rq.max_sge;
 341         attr->srq_limit = srq->limit;
 342         return 0;
 343 }
 344
 345 /**
 346  * ipath_destroy_srq - destroy a shared receive queue
 347  * @ibsrq: the SRQ to destroy
 348  */
 349 int ipath_destroy_srq(struct ib_srq *ibsrq)
 350 {
 351         struct ipath_srq *srq = to_isrq(ibsrq);
 352         struct ipath_ibdev *dev = to_idev(ibsrq->device);
 353
 354         dev->n_srqs_allocated--;
 355         vfree(srq->rq.wq);
 356         kfree(srq);
 357
 358         return 0;
 359 }