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_ibdev *dev = to_idev(ibsrq->device);
  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, j;
  59
  60                 if (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                 next = srq->rq.head + 1;
  68                 if (next >= srq->rq.size)
  69                         next = 0;
  70                 if (next == srq->rq.tail) {
  71                         spin_unlock_irqrestore(&srq->rq.lock, flags);
  72                         *bad_wr = wr;
  73                         ret = -ENOMEM;
  74                         goto bail;
  75                 }
  76
  77                 wqe = get_rwqe_ptr(&srq->rq, srq->rq.head);
  78                 wqe->wr_id = wr->wr_id;
  79                 wqe->sg_list[0].mr = NULL;
  80                 wqe->sg_list[0].vaddr = NULL;
  81                 wqe->sg_list[0].length = 0;
  82                 wqe->sg_list[0].sge_length = 0;
  83                 wqe->length = 0;
  84                 for (i = 0, j = 0; i < wr->num_sge; i++) {
  85                         /* Check LKEY */
  86                         if (to_ipd(srq->ibsrq.pd)->user &&
  87                             wr->sg_list[i].lkey == 0) {
  88                                 spin_unlock_irqrestore(&srq->rq.lock,
  89                                                        flags);
  90                                 *bad_wr = wr;
  91                                 ret = -EINVAL;
  92                                 goto bail;
  93                         }
  94                         if (wr->sg_list[i].length == 0)
  95                                 continue;
  96                         if (!ipath_lkey_ok(&dev->lk_table,
  97                                            &wqe->sg_list[j],
  98                                            &wr->sg_list[i],
  99                                            IB_ACCESS_LOCAL_WRITE)) {
 100                                 spin_unlock_irqrestore(&srq->rq.lock,
 101                                                        flags);
 102                                 *bad_wr = wr;
 103                                 ret = -EINVAL;
 104                                 goto bail;
 105                         }
 106                         wqe->length += wr->sg_list[i].length;
 107                         j++;
 108                 }
 109                 wqe->num_sge = j;
 110                 srq->rq.head = next;
 111                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 112         }
 113         ret = 0;
 114
 115 bail:
 116         return ret;
 117 }
 118
 119 /**
 120  * ipath_create_srq - create a shared receive queue
 121  * @ibpd: the protection domain of the SRQ to create
 122  * @attr: the attributes of the SRQ
 123  * @udata: not used by the InfiniPath verbs driver
 124  */
 125 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
 126                                 struct ib_srq_init_attr *srq_init_attr,
 127                                 struct ib_udata *udata)
 128 {
 129         struct ipath_ibdev *dev = to_idev(ibpd->device);
 130         struct ipath_srq *srq;
 131         u32 sz;
 132         struct ib_srq *ret;
 133
 134         if (dev->n_srqs_allocated == ib_ipath_max_srqs) {
 135                 ret = ERR_PTR(-ENOMEM);
 136                 goto bail;
 137         }
 138
 139         if (srq_init_attr->attr.max_wr == 0) {
 140                 ret = ERR_PTR(-EINVAL);
 141                 goto bail;
 142         }
 143
 144         if ((srq_init_attr->attr.max_sge > ib_ipath_max_srq_sges) ||
 145             (srq_init_attr->attr.max_wr > ib_ipath_max_srq_wrs)) {
 146                 ret = ERR_PTR(-EINVAL);
 147                 goto bail;
 148         }
 149
 150         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 151         if (!srq) {
 152                 ret = ERR_PTR(-ENOMEM);
 153                 goto bail;
 154         }
 155
 156         /*
 157          * Need to use vmalloc() if we want to support large #s of entries.
 158          */
 159         srq->rq.size = srq_init_attr->attr.max_wr + 1;
 160         sz = sizeof(struct ipath_sge) * srq_init_attr->attr.max_sge +
 161                 sizeof(struct ipath_rwqe);
 162         srq->rq.wq = vmalloc(srq->rq.size * sz);
 163         if (!srq->rq.wq) {
 164                 kfree(srq);
 165                 ret = ERR_PTR(-ENOMEM);
 166                 goto bail;
 167         }
 168
 169         /*
 170          * ib_create_srq() will initialize srq->ibsrq.
 171          */
 172         spin_lock_init(&srq->rq.lock);
 173         srq->rq.head = 0;
 174         srq->rq.tail = 0;
 175         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 176         srq->limit = srq_init_attr->attr.srq_limit;
 177
 178         ret = &srq->ibsrq;
 179
 180         dev->n_srqs_allocated++;
 181
 182 bail:
 183         return ret;
 184 }
 185
 186 /**
 187  * ipath_modify_srq - modify a shared receive queue
 188  * @ibsrq: the SRQ to modify
 189  * @attr: the new attributes of the SRQ
 190  * @attr_mask: indicates which attributes to modify
 191  * @udata: user data for ipathverbs.so
 192  */
 193 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 194                      enum ib_srq_attr_mask attr_mask,
 195                      struct ib_udata *udata)
 196 {
 197         struct ipath_srq *srq = to_isrq(ibsrq);
 198         unsigned long flags;
 199         int ret;
 200
 201         if (attr_mask & IB_SRQ_MAX_WR)
 202                 if ((attr->max_wr > ib_ipath_max_srq_wrs) ||
 203                     (attr->max_sge > srq->rq.max_sge)) {
 204                         ret = -EINVAL;
 205                         goto bail;
 206                 }
 207
 208         if (attr_mask & IB_SRQ_LIMIT)
 209                 if (attr->srq_limit >= srq->rq.size) {
 210                         ret = -EINVAL;
 211                         goto bail;
 212                 }
 213
 214         if (attr_mask & IB_SRQ_MAX_WR) {
 215                 struct ipath_rwqe *wq, *p;
 216                 u32 sz, size, n;
 217
 218                 sz = sizeof(struct ipath_rwqe) +
 219                         attr->max_sge * sizeof(struct ipath_sge);
 220                 size = attr->max_wr + 1;
 221                 wq = vmalloc(size * sz);
 222                 if (!wq) {
 223                         ret = -ENOMEM;
 224                         goto bail;
 225                 }
 226
 227                 spin_lock_irqsave(&srq->rq.lock, flags);
 228                 if (srq->rq.head < srq->rq.tail)
 229                         n = srq->rq.size + srq->rq.head - srq->rq.tail;
 230                 else
 231                         n = srq->rq.head - srq->rq.tail;
 232                 if (size <= n || size <= srq->limit) {
 233                         spin_unlock_irqrestore(&srq->rq.lock, flags);
 234                         vfree(wq);
 235                         ret = -EINVAL;
 236                         goto bail;
 237                 }
 238                 n = 0;
 239                 p = wq;
 240                 while (srq->rq.tail != srq->rq.head) {
 241                         struct ipath_rwqe *wqe;
 242                         int i;
 243
 244                         wqe = get_rwqe_ptr(&srq->rq, srq->rq.tail);
 245                         p->wr_id = wqe->wr_id;
 246                         p->length = wqe->length;
 247                         p->num_sge = wqe->num_sge;
 248                         for (i = 0; i < wqe->num_sge; i++)
 249                                 p->sg_list[i] = wqe->sg_list[i];
 250                         n++;
 251                         p = (struct ipath_rwqe *)((char *) p + sz);
 252                         if (++srq->rq.tail >= srq->rq.size)
 253                                 srq->rq.tail = 0;
 254                 }
 255                 vfree(srq->rq.wq);
 256                 srq->rq.wq = wq;
 257                 srq->rq.size = size;
 258                 srq->rq.head = n;
 259                 srq->rq.tail = 0;
 260                 srq->rq.max_sge = attr->max_sge;
 261                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 262         }
 263
 264         if (attr_mask & IB_SRQ_LIMIT) {
 265                 spin_lock_irqsave(&srq->rq.lock, flags);
 266                 srq->limit = attr->srq_limit;
 267                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 268         }
 269         ret = 0;
 270
 271 bail:
 272         return ret;
 273 }
 274
 275 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 276 {
 277         struct ipath_srq *srq = to_isrq(ibsrq);
 278
 279         attr->max_wr = srq->rq.size - 1;
 280         attr->max_sge = srq->rq.max_sge;
 281         attr->srq_limit = srq->limit;
 282         return 0;
 283 }
 284
 285 /**
 286  * ipath_destroy_srq - destroy a shared receive queue
 287  * @ibsrq: the SRQ to destroy
 288  */
 289 int ipath_destroy_srq(struct ib_srq *ibsrq)
 290 {
 291         struct ipath_srq *srq = to_isrq(ibsrq);
 292         struct ipath_ibdev *dev = to_idev(ibsrq->device);
 293
 294         dev->n_srqs_allocated--;
 295         vfree(srq->rq.wq);
 296         kfree(srq);
 297
 298         return 0;
 299 }