mthca_mcg.c

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    1 /*
    2  * Copyright (c) 2004 Topspin Communications.  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/string.h>
   34 #include <linux/gfp.h>
   35 
   36 #include "mthca_dev.h"
   37 #include "mthca_cmd.h"
   38 
   39 struct mthca_mgm {
   40         __be32 next_gid_index;
   41         u32    reserved[3];
   42         u8     gid[16];
   43         __be32 qp[MTHCA_QP_PER_MGM];
   44 };
   45 
   46 static const u8 zero_gid[16];   /* automatically initialized to 0 */
   47 
   48 /*
   49  * Caller must hold MCG table semaphore.  gid and mgm parameters must
   50  * be properly aligned for command interface.
   51  *
   52  *  Returns 0 unless a firmware command error occurs.
   53  *
   54  * If GID is found in MGM or MGM is empty, *index = *hash, *prev = -1
   55  * and *mgm holds MGM entry.
   56  *
   57  * if GID is found in AMGM, *index = index in AMGM, *prev = index of
   58  * previous entry in hash chain and *mgm holds AMGM entry.
   59  *
   60  * If no AMGM exists for given gid, *index = -1, *prev = index of last
   61  * entry in hash chain and *mgm holds end of hash chain.
   62  */
   63 static int find_mgm(struct mthca_dev *dev,
   64                     u8 *gid, struct mthca_mailbox *mgm_mailbox,
   65                     u16 *hash, int *prev, int *index)
   66 {
   67         struct mthca_mailbox *mailbox;
   68         struct mthca_mgm *mgm = mgm_mailbox->buf;
   69         u8 *mgid;
   70         int err;
   71 
   72         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
   73         if (IS_ERR(mailbox))
   74                 return -ENOMEM;
   75         mgid = mailbox->buf;
   76 
   77         memcpy(mgid, gid, 16);
   78 
   79         err = mthca_MGID_HASH(dev, mailbox, hash);
   80         if (err) {
   81                 mthca_err(dev, "MGID_HASH failed (%d)\n", err);
   82                 goto out;
   83         }
   84 
   85         if (0)
   86                 mthca_dbg(dev, "Hash for %pI6 is %04x\n", gid, *hash);
   87 
   88         *index = *hash;
   89         *prev  = -1;
   90 
   91         do {
   92                 err = mthca_READ_MGM(dev, *index, mgm_mailbox);
   93                 if (err) {
   94                         mthca_err(dev, "READ_MGM failed (%d)\n", err);
   95                         goto out;
   96                 }
   97 
   98                 if (!memcmp(mgm->gid, zero_gid, 16)) {
   99                         if (*index != *hash) {
  100                                 mthca_err(dev, "Found zero MGID in AMGM.\n");
  101                                 err = -EINVAL;
  102                         }
  103                         goto out;
  104                 }
  105 
  106                 if (!memcmp(mgm->gid, gid, 16))
  107                         goto out;
  108 
  109                 *prev = *index;
  110                 *index = be32_to_cpu(mgm->next_gid_index) >> 6;
  111         } while (*index);
  112 
  113         *index = -1;
  114 
  115  out:
  116         mthca_free_mailbox(dev, mailbox);
  117         return err;
  118 }
  119 
  120 int mthca_multicast_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
  121 {
  122         struct mthca_dev *dev = to_mdev(ibqp->device);
  123         struct mthca_mailbox *mailbox;
  124         struct mthca_mgm *mgm;
  125         u16 hash;
  126         int index, prev;
  127         int link = 0;
  128         int i;
  129         int err;
  130 
  131         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  132         if (IS_ERR(mailbox))
  133                 return PTR_ERR(mailbox);
  134         mgm = mailbox->buf;
  135 
  136         mutex_lock(&dev->mcg_table.mutex);
  137 
  138         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
  139         if (err)
  140                 goto out;
  141 
  142         if (index != -1) {
  143                 if (!memcmp(mgm->gid, zero_gid, 16))
  144                         memcpy(mgm->gid, gid->raw, 16);
  145         } else {
  146                 link = 1;
  147 
  148                 index = mthca_alloc(&dev->mcg_table.alloc);
  149                 if (index == -1) {
  150                         mthca_err(dev, "No AMGM entries left\n");
  151                         err = -ENOMEM;
  152                         goto out;
  153                 }
  154 
  155                 err = mthca_READ_MGM(dev, index, mailbox);
  156                 if (err) {
  157                         mthca_err(dev, "READ_MGM failed (%d)\n", err);
  158                         goto out;
  159                 }
  160                 memset(mgm, 0, sizeof *mgm);
  161                 memcpy(mgm->gid, gid->raw, 16);
  162         }
  163 
  164         for (i = 0; i < MTHCA_QP_PER_MGM; ++i)
  165                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31))) {
  166                         mthca_dbg(dev, "QP %06x already a member of MGM\n",
  167                                   ibqp->qp_num);
  168                         err = 0;
  169                         goto out;
  170                 } else if (!(mgm->qp[i] & cpu_to_be32(1 << 31))) {
  171                         mgm->qp[i] = cpu_to_be32(ibqp->qp_num | (1 << 31));
  172                         break;
  173                 }
  174 
  175         if (i == MTHCA_QP_PER_MGM) {
  176                 mthca_err(dev, "MGM at index %x is full.\n", index);
  177                 err = -ENOMEM;
  178                 goto out;
  179         }
  180 
  181         err = mthca_WRITE_MGM(dev, index, mailbox);
  182         if (err) {
  183                 mthca_err(dev, "WRITE_MGM failed %d\n", err);
  184                 err = -EINVAL;
  185                 goto out;
  186         }
  187 
  188         if (!link)
  189                 goto out;
  190 
  191         err = mthca_READ_MGM(dev, prev, mailbox);
  192         if (err) {
  193                 mthca_err(dev, "READ_MGM failed %d\n", err);
  194                 goto out;
  195         }
  196 
  197         mgm->next_gid_index = cpu_to_be32(index << 6);
  198 
  199         err = mthca_WRITE_MGM(dev, prev, mailbox);
  200         if (err)
  201                 mthca_err(dev, "WRITE_MGM returned %d\n", err);
  202 
  203  out:
  204         if (err && link && index != -1) {
  205                 BUG_ON(index < dev->limits.num_mgms);
  206                 mthca_free(&dev->mcg_table.alloc, index);
  207         }
  208         mutex_unlock(&dev->mcg_table.mutex);
  209 
  210         mthca_free_mailbox(dev, mailbox);
  211         return err;
  212 }
  213 
  214 int mthca_multicast_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
  215 {
  216         struct mthca_dev *dev = to_mdev(ibqp->device);
  217         struct mthca_mailbox *mailbox;
  218         struct mthca_mgm *mgm;
  219         u16 hash;
  220         int prev, index;
  221         int i, loc;
  222         int err;
  223 
  224         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
  225         if (IS_ERR(mailbox))
  226                 return PTR_ERR(mailbox);
  227         mgm = mailbox->buf;
  228 
  229         mutex_lock(&dev->mcg_table.mutex);
  230 
  231         err = find_mgm(dev, gid->raw, mailbox, &hash, &prev, &index);
  232         if (err)
  233                 goto out;
  234 
  235         if (index == -1) {
  236                 mthca_err(dev, "MGID %pI6 not found\n", gid->raw);
  237                 err = -EINVAL;
  238                 goto out;
  239         }
  240 
  241         for (loc = -1, i = 0; i < MTHCA_QP_PER_MGM; ++i) {
  242                 if (mgm->qp[i] == cpu_to_be32(ibqp->qp_num | (1 << 31)))
  243                         loc = i;
  244                 if (!(mgm->qp[i] & cpu_to_be32(1 << 31)))
  245                         break;
  246         }
  247 
  248         if (loc == -1) {
  249                 mthca_err(dev, "QP %06x not found in MGM\n", ibqp->qp_num);
  250                 err = -EINVAL;
  251                 goto out;
  252         }
  253 
  254         mgm->qp[loc]   = mgm->qp[i - 1];
  255         mgm->qp[i - 1] = 0;
  256 
  257         err = mthca_WRITE_MGM(dev, index, mailbox);
  258         if (err) {
  259                 mthca_err(dev, "WRITE_MGM returned %d\n", err);
  260                 goto out;
  261         }
  262 
  263         if (i != 1)
  264                 goto out;
  265 
  266         if (prev == -1) {
  267                 /* Remove entry from MGM */
  268                 int amgm_index_to_free = be32_to_cpu(mgm->next_gid_index) >> 6;
  269                 if (amgm_index_to_free) {
  270                         err = mthca_READ_MGM(dev, amgm_index_to_free,
  271                                              mailbox);
  272                         if (err) {
  273                                 mthca_err(dev, "READ_MGM returned %d\n", err);
  274                                 goto out;
  275                         }
  276                 } else
  277                         memset(mgm->gid, 0, 16);
  278 
  279                 err = mthca_WRITE_MGM(dev, index, mailbox);
  280                 if (err) {
  281                         mthca_err(dev, "WRITE_MGM returned %d\n", err);
  282                         goto out;
  283                 }
  284                 if (amgm_index_to_free) {
  285                         BUG_ON(amgm_index_to_free < dev->limits.num_mgms);
  286                         mthca_free(&dev->mcg_table.alloc, amgm_index_to_free);
  287                 }
  288         } else {
  289                 /* Remove entry from AMGM */
  290                 int curr_next_index = be32_to_cpu(mgm->next_gid_index) >> 6;
  291                 err = mthca_READ_MGM(dev, prev, mailbox);
  292                 if (err) {
  293                         mthca_err(dev, "READ_MGM returned %d\n", err);
  294                         goto out;
  295                 }
  296 
  297                 mgm->next_gid_index = cpu_to_be32(curr_next_index << 6);
  298 
  299                 err = mthca_WRITE_MGM(dev, prev, mailbox);
  300                 if (err) {
  301                         mthca_err(dev, "WRITE_MGM returned %d\n", err);
  302                         goto out;
  303                 }
  304                 BUG_ON(index < dev->limits.num_mgms);
  305                 mthca_free(&dev->mcg_table.alloc, index);
  306         }
  307 
  308  out:
  309         mutex_unlock(&dev->mcg_table.mutex);
  310 
  311         mthca_free_mailbox(dev, mailbox);
  312         return err;
  313 }
  314 
  315 int mthca_init_mcg_table(struct mthca_dev *dev)
  316 {
  317         int err;
  318         int table_size = dev->limits.num_mgms + dev->limits.num_amgms;
  319 
  320         err = mthca_alloc_init(&dev->mcg_table.alloc,
  321                                table_size,
  322                                table_size - 1,
  323                                dev->limits.num_mgms);
  324         if (err)
  325                 return err;
  326 
  327         mutex_init(&dev->mcg_table.mutex);
  328 
  329         return 0;
  330 }
  331 
  332 void mthca_cleanup_mcg_table(struct mthca_dev *dev)
  333 {
  334         mthca_alloc_cleanup(&dev->mcg_table.alloc);
  335 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/mthca/mthca_mcg.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mthca/mthca_mcg.c
