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 (srq_init_attr->attr.max_wr == 0) {
 108                 ret = ERR_PTR(-EINVAL);
 109                 goto done;
 110         }
 111
 112         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
 113             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
 114                 ret = ERR_PTR(-EINVAL);
 115                 goto done;
 116         }
 117
 118         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 119         if (!srq) {
 120                 ret = ERR_PTR(-ENOMEM);
 121                 goto done;
 122         }
 123
 124         /*
 125          * Need to use vmalloc() if we want to support large #s of entries.
 126          */
 127         srq->rq.size = srq_init_attr->attr.max_wr + 1;
 128         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 129         sz = sizeof(struct ib_sge) * srq->rq.max_sge +
 130                 sizeof(struct ipath_rwqe);
 131         srq->rq.wq = vmalloc_user(sizeof(struct ipath_rwq) + srq->rq.size * sz);
 132         if (!srq->rq.wq) {
 133                 ret = ERR_PTR(-ENOMEM);
 134                 goto bail_srq;
 135         }
 136
 137         /*
 138          * Return the address of the RWQ as the offset to mmap.
 139          * See ipath_mmap() for details.
 140          */
 141         if (udata && udata->outlen >= sizeof(__u64)) {
 142                 struct ipath_mmap_info *ip;
 143                 __u64 offset = (__u64) srq->rq.wq;
 144                 int err;
 145
 146                 err = ib_copy_to_udata(udata, &offset, sizeof(offset));
 147                 if (err) {
 148                         ret = ERR_PTR(err);
 149                         goto bail_wq;
 150                 }
 151
 152                 /* Allocate info for ipath_mmap(). */
 153                 ip = kmalloc(sizeof(*ip), GFP_KERNEL);
 154                 if (!ip) {
 155                         ret = ERR_PTR(-ENOMEM);
 156                         goto bail_wq;
 157                 }
 158                 srq->ip = ip;
 159                 ip->context = ibpd->uobject->context;
 160                 ip->obj = srq->rq.wq;
 161                 kref_init(&ip->ref);
 162                 ip->mmap_cnt = 0;
 163                 ip->size = PAGE_ALIGN(sizeof(struct ipath_rwq) +
 164                                       srq->rq.size * sz);
 165                 spin_lock_irq(&dev->pending_lock);
 166                 ip->next = dev->pending_mmaps;
 167                 dev->pending_mmaps = ip;
 168                 spin_unlock_irq(&dev->pending_lock);
 169         } else
 170                 srq->ip = NULL;
 171
 172         /*
 173          * ib_create_srq() will initialize srq->ibsrq.
 174          */
 175         spin_lock_init(&srq->rq.lock);
 176         srq->rq.wq->head = 0;
 177         srq->rq.wq->tail = 0;
 178         srq->limit = srq_init_attr->attr.srq_limit;
 179
 180         spin_lock(&dev->n_srqs_lock);
 181         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
 182                 spin_unlock(&dev->n_srqs_lock);
 183                 ret = ERR_PTR(-ENOMEM);
 184                 goto bail_wq;
 185         }
 186
 187         dev->n_srqs_allocated++;
 188         spin_unlock(&dev->n_srqs_lock);
 189
 190         ret = &srq->ibsrq;
 191         goto done;
 192
 193 bail_wq:
 194         vfree(srq->rq.wq);
 195
 196 bail_srq:
 197         kfree(srq);
 198
 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         int ret = 0;
 216
 217         if (attr_mask & IB_SRQ_MAX_WR) {
 218                 struct ipath_rwq *owq;
 219                 struct ipath_rwq *wq;
 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                 /*
 241                  * Return the address of the RWQ as the offset to mmap.
 242                  * See ipath_mmap() for details.
 243                  */
 244                 if (udata && udata->inlen >= sizeof(__u64)) {
 245                         __u64 offset_addr;
 246                         __u64 offset = (__u64) wq;
 247
 248                         ret = ib_copy_from_udata(&offset_addr, udata,
 249                                                  sizeof(offset_addr));
 250                         if (ret) {
 251                                 vfree(wq);
 252                                 goto bail;
 253                         }
 254                         udata->outbuf = (void __user *) offset_addr;
 255                         ret = ib_copy_to_udata(udata, &offset,
 256                                                sizeof(offset));
 257                         if (ret) {
 258                                 vfree(wq);
 259                                 goto bail;
 260                         }
 261                 }
 262
 263                 spin_lock_irq(&srq->rq.lock);
 264                 /*
 265                  * validate head pointer value and compute
 266                  * the number of remaining WQEs.
 267                  */
 268                 owq = srq->rq.wq;
 269                 head = owq->head;
 270                 if (head >= srq->rq.size)
 271                         head = 0;
 272                 tail = owq->tail;
 273                 if (tail >= srq->rq.size)
 274                         tail = 0;
 275                 n = head;
 276                 if (n < tail)
 277                         n += srq->rq.size - tail;
 278                 else
 279                         n -= tail;
 280                 if (size <= n) {
 281                         spin_unlock_irq(&srq->rq.lock);
 282                         vfree(wq);
 283                         ret = -EINVAL;
 284                         goto bail;
 285                 }
 286                 n = 0;
 287                 p = wq->wq;
 288                 while (tail != head) {
 289                         struct ipath_rwqe *wqe;
 290                         int i;
 291
 292                         wqe = get_rwqe_ptr(&srq->rq, tail);
 293                         p->wr_id = wqe->wr_id;
 294                         p->num_sge = wqe->num_sge;
 295                         for (i = 0; i < wqe->num_sge; i++)
 296                                 p->sg_list[i] = wqe->sg_list[i];
 297                         n++;
 298                         p = (struct ipath_rwqe *)((char *) p + sz);
 299                         if (++tail >= srq->rq.size)
 300                                 tail = 0;
 301                 }
 302                 srq->rq.wq = wq;
 303                 srq->rq.size = size;
 304                 wq->head = n;
 305                 wq->tail = 0;
 306                 if (attr_mask & IB_SRQ_LIMIT)
 307                         srq->limit = attr->srq_limit;
 308                 spin_unlock_irq(&srq->rq.lock);
 309
 310                 vfree(owq);
 311
 312                 if (srq->ip) {
 313                         struct ipath_mmap_info *ip = srq->ip;
 314                         struct ipath_ibdev *dev = to_idev(srq->ibsrq.device);
 315
 316                         ip->obj = wq;
 317                         ip->size = PAGE_ALIGN(sizeof(struct ipath_rwq) +
 318                                               size * sz);
 319                         spin_lock_irq(&dev->pending_lock);
 320                         ip->next = dev->pending_mmaps;
 321                         dev->pending_mmaps = ip;
 322                         spin_unlock_irq(&dev->pending_lock);
 323                 }
 324         } else if (attr_mask & IB_SRQ_LIMIT) {
 325                 spin_lock_irq(&srq->rq.lock);
 326                 if (attr->srq_limit >= srq->rq.size)
 327                         ret = -EINVAL;
 328                 else
 329                         srq->limit = attr->srq_limit;
 330                 spin_unlock_irq(&srq->rq.lock);
 331         }
 332
 333 bail:
 334         return ret;
 335 }
 336
 337 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 338 {
 339         struct ipath_srq *srq = to_isrq(ibsrq);
 340
 341         attr->max_wr = srq->rq.size - 1;
 342         attr->max_sge = srq->rq.max_sge;
 343         attr->srq_limit = srq->limit;
 344         return 0;
 345 }
 346
 347 /**
 348  * ipath_destroy_srq - destroy a shared receive queue
 349  * @ibsrq: the SRQ to destroy
 350  */
 351 int ipath_destroy_srq(struct ib_srq *ibsrq)
 352 {
 353         struct ipath_srq *srq = to_isrq(ibsrq);
 354         struct ipath_ibdev *dev = to_idev(ibsrq->device);
 355
 356         spin_lock(&dev->n_srqs_lock);
 357         dev->n_srqs_allocated--;
 358         spin_unlock(&dev->n_srqs_lock);
 359         if (srq->ip)
 360                 kref_put(&srq->ip->ref, ipath_release_mmap_info);
 361         else
 362                 vfree(srq->rq.wq);
 363         kfree(srq);
 364
 365         return 0;
 366 }