drivers/infiniband/sw/rxe/rxe_mcast.c

   1 /*
   2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3  * Copyright (c) 2015 System Fabric Works, 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 "rxe.h"
  35 #include "rxe_loc.h"
  36
  37 int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
  38                       struct rxe_mc_grp **grp_p)
  39 {
  40         int err;
  41         struct rxe_mc_grp *grp;
  42
  43         if (rxe->attr.max_mcast_qp_attach == 0) {
  44                 err = -EINVAL;
  45                 goto err1;
  46         }
  47
  48         grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
  49         if (grp)
  50                 goto done;
  51
  52         grp = rxe_alloc(&rxe->mc_grp_pool);
  53         if (!grp) {
  54                 err = -ENOMEM;
  55                 goto err1;
  56         }
  57
  58         INIT_LIST_HEAD(&grp->qp_list);
  59         spin_lock_init(&grp->mcg_lock);
  60         grp->rxe = rxe;
  61
  62         rxe_add_key(grp, mgid);
  63
  64         err = rxe_mcast_add(rxe, mgid);
  65         if (err)
  66                 goto err2;
  67
  68 done:
  69         *grp_p = grp;
  70         return 0;
  71
  72 err2:
  73         rxe_drop_ref(grp);
  74 err1:
  75         return err;
  76 }
  77
  78 int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
  79                            struct rxe_mc_grp *grp)
  80 {
  81         int err;
  82         struct rxe_mc_elem *elem;
  83
  84         /* check to see of the qp is already a member of the group */
  85         spin_lock_bh(&qp->grp_lock);
  86         spin_lock_bh(&grp->mcg_lock);
  87         list_for_each_entry(elem, &grp->qp_list, qp_list) {
  88                 if (elem->qp == qp) {
  89                         err = 0;
  90                         goto out;
  91                 }
  92         }
  93
  94         if (grp->num_qp >= rxe->attr.max_mcast_qp_attach) {
  95                 err = -ENOMEM;
  96                 goto out;
  97         }
  98
  99         elem = rxe_alloc(&rxe->mc_elem_pool);
 100         if (!elem) {
 101                 err = -ENOMEM;
 102                 goto out;
 103         }
 104
 105         /* each qp holds a ref on the grp */
 106         rxe_add_ref(grp);
 107
 108         grp->num_qp++;
 109         elem->qp = qp;
 110         elem->grp = grp;
 111
 112         list_add(&elem->qp_list, &grp->qp_list);
 113         list_add(&elem->grp_list, &qp->grp_list);
 114
 115         err = 0;
 116 out:
 117         spin_unlock_bh(&grp->mcg_lock);
 118         spin_unlock_bh(&qp->grp_lock);
 119         return err;
 120 }
 121
 122 int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
 123                             union ib_gid *mgid)
 124 {
 125         struct rxe_mc_grp *grp;
 126         struct rxe_mc_elem *elem, *tmp;
 127
 128         grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
 129         if (!grp)
 130                 goto err1;
 131
 132         spin_lock_bh(&qp->grp_lock);
 133         spin_lock_bh(&grp->mcg_lock);
 134
 135         list_for_each_entry_safe(elem, tmp, &grp->qp_list, qp_list) {
 136                 if (elem->qp == qp) {
 137                         list_del(&elem->qp_list);
 138                         list_del(&elem->grp_list);
 139                         grp->num_qp--;
 140
 141                         spin_unlock_bh(&grp->mcg_lock);
 142                         spin_unlock_bh(&qp->grp_lock);
 143                         rxe_drop_ref(elem);
 144                         rxe_drop_ref(grp);      /* ref held by QP */
 145                         rxe_drop_ref(grp);      /* ref from get_key */
 146                         return 0;
 147                 }
 148         }
 149
 150         spin_unlock_bh(&grp->mcg_lock);
 151         spin_unlock_bh(&qp->grp_lock);
 152         rxe_drop_ref(grp);                      /* ref from get_key */
 153 err1:
 154         return -EINVAL;
 155 }
 156
 157 void rxe_drop_all_mcast_groups(struct rxe_qp *qp)
 158 {
 159         struct rxe_mc_grp *grp;
 160         struct rxe_mc_elem *elem;
 161
 162         while (1) {
 163                 spin_lock_bh(&qp->grp_lock);
 164                 if (list_empty(&qp->grp_list)) {
 165                         spin_unlock_bh(&qp->grp_lock);
 166                         break;
 167                 }
 168                 elem = list_first_entry(&qp->grp_list, struct rxe_mc_elem,
 169                                         grp_list);
 170                 list_del(&elem->grp_list);
 171                 spin_unlock_bh(&qp->grp_lock);
 172
 173                 grp = elem->grp;
 174                 spin_lock_bh(&grp->mcg_lock);
 175                 list_del(&elem->qp_list);
 176                 grp->num_qp--;
 177                 spin_unlock_bh(&grp->mcg_lock);
 178                 rxe_drop_ref(grp);
 179                 rxe_drop_ref(elem);
 180         }
 181 }
 182
 183 void rxe_mc_cleanup(struct rxe_pool_entry *arg)
 184 {
 185         struct rxe_mc_grp *grp = container_of(arg, typeof(*grp), pelem);
 186         struct rxe_dev *rxe = grp->rxe;
 187
 188         rxe_drop_key(grp);
 189         rxe_mcast_delete(rxe, &grp->mgid);
 190 }