drivers/infiniband/hw/ipath/ipath_srq.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. 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/slab.h>
  36 #include <linux/vmalloc.h>
  37
  38 #include "ipath_verbs.h"
  39
  40 /**
  41  * ipath_post_srq_receive - post a receive on a shared receive queue
  42  * @ibsrq: the SRQ to post the receive on
  43  * @wr: the list of work requests to post
  44  * @bad_wr: the first WR to cause a problem is put here
  45  *
  46  * This may be called from interrupt context.
  47  */
  48 int ipath_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
  49                            struct ib_recv_wr **bad_wr)
  50 {
  51         struct ipath_srq *srq = to_isrq(ibsrq);
  52         struct ipath_rwq *wq;
  53         unsigned long flags;
  54         int ret;
  55
  56         for (; wr; wr = wr->next) {
  57                 struct ipath_rwqe *wqe;
  58                 u32 next;
  59                 int i;
  60
  61                 if ((unsigned) wr->num_sge > srq->rq.max_sge) {
  62                         *bad_wr = wr;
  63                         ret = -EINVAL;
  64                         goto bail;
  65                 }
  66
  67                 spin_lock_irqsave(&srq->rq.lock, flags);
  68                 wq = srq->rq.wq;
  69                 next = wq->head + 1;
  70                 if (next >= srq->rq.size)
  71                         next = 0;
  72                 if (next == wq->tail) {
  73                         spin_unlock_irqrestore(&srq->rq.lock, flags);
  74                         *bad_wr = wr;
  75                         ret = -ENOMEM;
  76                         goto bail;
  77                 }
  78
  79                 wqe = get_rwqe_ptr(&srq->rq, wq->head);
  80                 wqe->wr_id = wr->wr_id;
  81                 wqe->num_sge = wr->num_sge;
  82                 for (i = 0; i < wr->num_sge; i++)
  83                         wqe->sg_list[i] = wr->sg_list[i];
  84                 /* Make sure queue entry is written before the head index. */
  85                 smp_wmb();
  86                 wq->head = next;
  87                 spin_unlock_irqrestore(&srq->rq.lock, flags);
  88         }
  89         ret = 0;
  90
  91 bail:
  92         return ret;
  93 }
  94
  95 /**
  96  * ipath_create_srq - create a shared receive queue
  97  * @ibpd: the protection domain of the SRQ to create
  98  * @srq_init_attr: the attributes of the SRQ
  99  * @udata: data from libipathverbs when creating a user SRQ
 100  */
 101 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
 102                                 struct ib_srq_init_attr *srq_init_attr,
 103                                 struct ib_udata *udata)
 104 {
 105         struct ipath_ibdev *dev = to_idev(ibpd->device);
 106         struct ipath_srq *srq;
 107         u32 sz;
 108         struct ib_srq *ret;
 109
 110         if (srq_init_attr->attr.max_wr == 0) {
 111                 ret = ERR_PTR(-EINVAL);
 112                 goto done;
 113         }
 114
 115         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
 116             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
 117                 ret = ERR_PTR(-EINVAL);
 118                 goto done;
 119         }
 120
 121         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 122         if (!srq) {
 123                 ret = ERR_PTR(-ENOMEM);
 124                 goto done;
 125         }
 126
 127         /*
 128          * Need to use vmalloc() if we want to support large #s of entries.
 129          */
 130         srq->rq.size = srq_init_attr->attr.max_wr + 1;
 131         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 132         sz = sizeof(struct ib_sge) * srq->rq.max_sge +
 133                 sizeof(struct ipath_rwqe);
 134         srq->rq.wq = vmalloc_user(sizeof(struct ipath_rwq) + srq->rq.size * sz);
 135         if (!srq->rq.wq) {
 136                 ret = ERR_PTR(-ENOMEM);
 137                 goto bail_srq;
 138         }
 139
 140         /*
 141          * Return the address of the RWQ as the offset to mmap.
 142          * See ipath_mmap() for details.
 143          */
 144         if (udata && udata->outlen >= sizeof(__u64)) {
 145                 int err;
 146                 u32 s = sizeof(struct ipath_rwq) + srq->rq.size * sz;
 147
 148                 srq->ip =
 149                     ipath_create_mmap_info(dev, s,
 150                                            ibpd->uobject->context,
 151                                            srq->rq.wq);
 152                 if (!srq->ip) {
 153                         ret = ERR_PTR(-ENOMEM);
 154                         goto bail_wq;
 155                 }
 156
 157                 err = ib_copy_to_udata(udata, &srq->ip->offset,
 158                                        sizeof(srq->ip->offset));
 159                 if (err) {
 160                         ret = ERR_PTR(err);
 161                         goto bail_ip;
 162                 }
 163         } else
 164                 srq->ip = NULL;
 165
 166         /*
 167          * ib_create_srq() will initialize srq->ibsrq.
 168          */
 169         spin_lock_init(&srq->rq.lock);
 170         srq->rq.wq->head = 0;
 171         srq->rq.wq->tail = 0;
 172         srq->limit = srq_init_attr->attr.srq_limit;
 173
 174         spin_lock(&dev->n_srqs_lock);
 175         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
 176                 spin_unlock(&dev->n_srqs_lock);
 177                 ret = ERR_PTR(-ENOMEM);
 178                 goto bail_ip;
 179         }
 180
 181         dev->n_srqs_allocated++;
 182         spin_unlock(&dev->n_srqs_lock);
 183
 184         if (srq->ip) {
 185                 spin_lock_irq(&dev->pending_lock);
 186                 list_add(&srq->ip->pending_mmaps, &dev->pending_mmaps);
 187                 spin_unlock_irq(&dev->pending_lock);
 188         }
 189
 190         ret = &srq->ibsrq;
 191         goto done;
 192
 193 bail_ip:
 194         kfree(srq->ip);
 195 bail_wq:
 196         vfree(srq->rq.wq);
 197 bail_srq:
 198         kfree(srq);
 199 done:
 200         return ret;
 201 }
 202
 203 /**
 204  * ipath_modify_srq - modify a shared receive queue
 205  * @ibsrq: the SRQ to modify
 206  * @attr: the new attributes of the SRQ
 207  * @attr_mask: indicates which attributes to modify
 208  * @udata: user data for ipathverbs.so
 209  */
 210 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 211                      enum ib_srq_attr_mask attr_mask,
 212                      struct ib_udata *udata)
 213 {
 214         struct ipath_srq *srq = to_isrq(ibsrq);
 215         struct ipath_rwq *wq;
 216         int ret = 0;
 217
 218         if (attr_mask & IB_SRQ_MAX_WR) {
 219                 struct ipath_rwq *owq;
 220                 struct ipath_rwqe *p;
 221                 u32 sz, size, n, head, tail;
 222
 223                 /* Check that the requested sizes are below the limits. */
 224                 if ((attr->max_wr > ib_ipath_max_srq_wrs) ||
 225                     ((attr_mask & IB_SRQ_LIMIT) ?
 226                      attr->srq_limit : srq->limit) > attr->max_wr) {
 227                         ret = -EINVAL;
 228                         goto bail;
 229                 }
 230
 231                 sz = sizeof(struct ipath_rwqe) +
 232                         srq->rq.max_sge * sizeof(struct ib_sge);
 233                 size = attr->max_wr + 1;
 234                 wq = vmalloc_user(sizeof(struct ipath_rwq) + size * sz);
 235                 if (!wq) {
 236                         ret = -ENOMEM;
 237                         goto bail;
 238                 }
 239
 240                 /* Check that we can write the offset to mmap. */
 241                 if (udata && udata->inlen >= sizeof(__u64)) {
 242                         __u64 offset_addr;
 243                         __u64 offset = 0;
 244
 245                         ret = ib_copy_from_udata(&offset_addr, udata,
 246                                                  sizeof(offset_addr));
 247                         if (ret)
 248                                 goto bail_free;
 249                         udata->outbuf =
 250                                 (void __user *) (unsigned long) offset_addr;
 251                         ret = ib_copy_to_udata(udata, &offset,
 252                                                sizeof(offset));
 253                         if (ret)
 254                                 goto bail_free;
 255                 }
 256
 257                 spin_lock_irq(&srq->rq.lock);
 258                 /*
 259                  * validate head pointer value and compute
 260                  * the number of remaining WQEs.
 261                  */
 262                 owq = srq->rq.wq;
 263                 head = owq->head;
 264                 if (head >= srq->rq.size)
 265                         head = 0;
 266                 tail = owq->tail;
 267                 if (tail >= srq->rq.size)
 268                         tail = 0;
 269                 n = head;
 270                 if (n < tail)
 271                         n += srq->rq.size - tail;
 272                 else
 273                         n -= tail;
 274                 if (size <= n) {
 275                         ret = -EINVAL;
 276                         goto bail_unlock;
 277                 }
 278                 n = 0;
 279                 p = wq->wq;
 280                 while (tail != head) {
 281                         struct ipath_rwqe *wqe;
 282                         int i;
 283
 284                         wqe = get_rwqe_ptr(&srq->rq, tail);
 285                         p->wr_id = wqe->wr_id;
 286                         p->num_sge = wqe->num_sge;
 287                         for (i = 0; i < wqe->num_sge; i++)
 288                                 p->sg_list[i] = wqe->sg_list[i];
 289                         n++;
 290                         p = (struct ipath_rwqe *)((char *) p + sz);
 291                         if (++tail >= srq->rq.size)
 292                                 tail = 0;
 293                 }
 294                 srq->rq.wq = wq;
 295                 srq->rq.size = size;
 296                 wq->head = n;
 297                 wq->tail = 0;
 298                 if (attr_mask & IB_SRQ_LIMIT)
 299                         srq->limit = attr->srq_limit;
 300                 spin_unlock_irq(&srq->rq.lock);
 301
 302                 vfree(owq);
 303
 304                 if (srq->ip) {
 305                         struct ipath_mmap_info *ip = srq->ip;
 306                         struct ipath_ibdev *dev = to_idev(srq->ibsrq.device);
 307                         u32 s = sizeof(struct ipath_rwq) + size * sz;
 308
 309                         ipath_update_mmap_info(dev, ip, s, wq);
 310
 311                         /*
 312                          * Return the offset to mmap.
 313                          * See ipath_mmap() for details.
 314                          */
 315                         if (udata && udata->inlen >= sizeof(__u64)) {
 316                                 ret = ib_copy_to_udata(udata, &ip->offset,
 317                                                        sizeof(ip->offset));
 318                                 if (ret)
 319                                         goto bail;
 320                         }
 321
 322                         spin_lock_irq(&dev->pending_lock);
 323                         if (list_empty(&ip->pending_mmaps))
 324                                 list_add(&ip->pending_mmaps,
 325                                          &dev->pending_mmaps);
 326                         spin_unlock_irq(&dev->pending_lock);
 327                 }
 328         } else if (attr_mask & IB_SRQ_LIMIT) {
 329                 spin_lock_irq(&srq->rq.lock);
 330                 if (attr->srq_limit >= srq->rq.size)
 331                         ret = -EINVAL;
 332                 else
 333                         srq->limit = attr->srq_limit;
 334                 spin_unlock_irq(&srq->rq.lock);
 335         }
 336         goto bail;
 337
 338 bail_unlock:
 339         spin_unlock_irq(&srq->rq.lock);
 340 bail_free:
 341         vfree(wq);
 342 bail:
 343         return ret;
 344 }
 345
 346 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 347 {
 348         struct ipath_srq *srq = to_isrq(ibsrq);
 349
 350         attr->max_wr = srq->rq.size - 1;
 351         attr->max_sge = srq->rq.max_sge;
 352         attr->srq_limit = srq->limit;
 353         return 0;
 354 }
 355
 356 /**
 357  * ipath_destroy_srq - destroy a shared receive queue
 358  * @ibsrq: the SRQ to destroy
 359  */
 360 int ipath_destroy_srq(struct ib_srq *ibsrq)
 361 {
 362         struct ipath_srq *srq = to_isrq(ibsrq);
 363         struct ipath_ibdev *dev = to_idev(ibsrq->device);
 364
 365         spin_lock(&dev->n_srqs_lock);
 366         dev->n_srqs_allocated--;
 367         spin_unlock(&dev->n_srqs_lock);
 368         if (srq->ip)
 369                 kref_put(&srq->ip->ref, ipath_release_mmap_info);
 370         else
 371                 vfree(srq->rq.wq);
 372         kfree(srq);
 373
 374         return 0;
 375 }