drivers/infiniband/ulp/ipoib/ipoib_verbs.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Mellanox Technologies. 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  * $Id: ipoib_verbs.c 1349 2004-12-16 21:09:43Z roland $
  34  */
  35
  36 #include <rdma/ib_cache.h>
  37
  38 #include "ipoib.h"
  39
  40 int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
  41 {
  42         struct ipoib_dev_priv *priv = netdev_priv(dev);
  43         struct ib_qp_attr *qp_attr;
  44         int attr_mask;
  45         int ret;
  46         u16 pkey_index;
  47
  48         ret = -ENOMEM;
  49         qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
  50         if (!qp_attr)
  51                 goto out;
  52
  53         if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
  54                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
  55                 ret = -ENXIO;
  56                 goto out;
  57         }
  58         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
  59
  60         /* set correct QKey for QP */
  61         qp_attr->qkey = priv->qkey;
  62         attr_mask = IB_QP_QKEY;
  63         ret = ib_modify_qp(priv->qp, qp_attr, attr_mask);
  64         if (ret) {
  65                 ipoib_warn(priv, "failed to modify QP, ret = %d\n", ret);
  66                 goto out;
  67         }
  68
  69         /* attach QP to multicast group */
  70         down(&priv->mcast_mutex);
  71         ret = ib_attach_mcast(priv->qp, mgid, mlid);
  72         up(&priv->mcast_mutex);
  73         if (ret)
  74                 ipoib_warn(priv, "failed to attach to multicast group, ret = %d\n", ret);
  75
  76 out:
  77         kfree(qp_attr);
  78         return ret;
  79 }
  80
  81 int ipoib_mcast_detach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
  82 {
  83         struct ipoib_dev_priv *priv = netdev_priv(dev);
  84         int ret;
  85
  86         down(&priv->mcast_mutex);
  87         ret = ib_detach_mcast(priv->qp, mgid, mlid);
  88         up(&priv->mcast_mutex);
  89         if (ret)
  90                 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
  91
  92         return ret;
  93 }
  94
  95 int ipoib_init_qp(struct net_device *dev)
  96 {
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98         int ret;
  99         u16 pkey_index;
 100         struct ib_qp_attr qp_attr;
 101         int attr_mask;
 102
 103         /*
 104          * Search through the port P_Key table for the requested pkey value.
 105          * The port has to be assigned to the respective IB partition in
 106          * advance.
 107          */
 108         ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index);
 109         if (ret) {
 110                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 111                 return ret;
 112         }
 113         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 114
 115         qp_attr.qp_state = IB_QPS_INIT;
 116         qp_attr.qkey = 0;
 117         qp_attr.port_num = priv->port;
 118         qp_attr.pkey_index = pkey_index;
 119         attr_mask =
 120             IB_QP_QKEY |
 121             IB_QP_PORT |
 122             IB_QP_PKEY_INDEX |
 123             IB_QP_STATE;
 124         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
 125         if (ret) {
 126                 ipoib_warn(priv, "failed to modify QP to init, ret = %d\n", ret);
 127                 goto out_fail;
 128         }
 129
 130         qp_attr.qp_state = IB_QPS_RTR;
 131         /* Can't set this in a INIT->RTR transition */
 132         attr_mask &= ~IB_QP_PORT;
 133         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
 134         if (ret) {
 135                 ipoib_warn(priv, "failed to modify QP to RTR, ret = %d\n", ret);
 136                 goto out_fail;
 137         }
 138
 139         qp_attr.qp_state = IB_QPS_RTS;
 140         qp_attr.sq_psn = 0;
 141         attr_mask |= IB_QP_SQ_PSN;
 142         attr_mask &= ~IB_QP_PKEY_INDEX;
 143         ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
 144         if (ret) {
 145                 ipoib_warn(priv, "failed to modify QP to RTS, ret = %d\n", ret);
 146                 goto out_fail;
 147         }
 148
 149         return 0;
 150
 151 out_fail:
 152         qp_attr.qp_state = IB_QPS_RESET;
 153         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 154                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 155
 156         return ret;
 157 }
 158
 159 int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
 160 {
 161         struct ipoib_dev_priv *priv = netdev_priv(dev);
 162         struct ib_qp_init_attr init_attr = {
 163                 .cap = {
 164                         .max_send_wr  = IPOIB_TX_RING_SIZE,
 165                         .max_recv_wr  = IPOIB_RX_RING_SIZE,
 166                         .max_send_sge = 1,
 167                         .max_recv_sge = 1
 168                 },
 169                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 170                 .qp_type     = IB_QPT_UD
 171         };
 172
 173         priv->pd = ib_alloc_pd(priv->ca);
 174         if (IS_ERR(priv->pd)) {
 175                 printk(KERN_WARNING "%s: failed to allocate PD\n", ca->name);
 176                 return -ENODEV;
 177         }
 178
 179         priv->cq = ib_create_cq(priv->ca, ipoib_ib_completion, NULL, dev,
 180                                 IPOIB_TX_RING_SIZE + IPOIB_RX_RING_SIZE + 1);
 181         if (IS_ERR(priv->cq)) {
 182                 printk(KERN_WARNING "%s: failed to create CQ\n", ca->name);
 183                 goto out_free_pd;
 184         }
 185
 186         if (ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP))
 187                 goto out_free_cq;
 188
 189         priv->mr = ib_get_dma_mr(priv->pd, IB_ACCESS_LOCAL_WRITE);
 190         if (IS_ERR(priv->mr)) {
 191                 printk(KERN_WARNING "%s: ib_get_dma_mr failed\n", ca->name);
 192                 goto out_free_cq;
 193         }
 194
 195         init_attr.send_cq = priv->cq;
 196         init_attr.recv_cq = priv->cq,
 197
 198         priv->qp = ib_create_qp(priv->pd, &init_attr);
 199         if (IS_ERR(priv->qp)) {
 200                 printk(KERN_WARNING "%s: failed to create QP\n", ca->name);
 201                 goto out_free_mr;
 202         }
 203
 204         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
 205         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
 206         priv->dev->dev_addr[3] = (priv->qp->qp_num      ) & 0xff;
 207
 208         priv->tx_sge.lkey       = priv->mr->lkey;
 209
 210         priv->tx_wr.opcode      = IB_WR_SEND;
 211         priv->tx_wr.sg_list     = &priv->tx_sge;
 212         priv->tx_wr.num_sge     = 1;
 213         priv->tx_wr.send_flags  = IB_SEND_SIGNALED;
 214
 215         return 0;
 216
 217 out_free_mr:
 218         ib_dereg_mr(priv->mr);
 219
 220 out_free_cq:
 221         ib_destroy_cq(priv->cq);
 222
 223 out_free_pd:
 224         ib_dealloc_pd(priv->pd);
 225         return -ENODEV;
 226 }
 227
 228 void ipoib_transport_dev_cleanup(struct net_device *dev)
 229 {
 230         struct ipoib_dev_priv *priv = netdev_priv(dev);
 231
 232         if (priv->qp) {
 233                 if (ib_destroy_qp(priv->qp))
 234                         ipoib_warn(priv, "ib_qp_destroy failed\n");
 235
 236                 priv->qp = NULL;
 237                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 238         }
 239
 240         if (ib_dereg_mr(priv->mr))
 241                 ipoib_warn(priv, "ib_dereg_mr failed\n");
 242
 243         if (ib_destroy_cq(priv->cq))
 244                 ipoib_warn(priv, "ib_cq_destroy failed\n");
 245
 246         if (ib_dealloc_pd(priv->pd))
 247                 ipoib_warn(priv, "ib_dealloc_pd failed\n");
 248 }
 249
 250 void ipoib_event(struct ib_event_handler *handler,
 251                  struct ib_event *record)
 252 {
 253         struct ipoib_dev_priv *priv =
 254                 container_of(handler, struct ipoib_dev_priv, event_handler);
 255
 256         if (record->event == IB_EVENT_PORT_ACTIVE ||
 257             record->event == IB_EVENT_LID_CHANGE  ||
 258             record->event == IB_EVENT_SM_CHANGE) {
 259                 ipoib_dbg(priv, "Port active event\n");
 260                 schedule_work(&priv->flush_task);
 261         }
 262 }