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ipoib_verbs.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: ipoib_verbs.c 1349 2004-12-16 21:09:43Z roland $
 */

#include "ipoib.h"

int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_attr *qp_attr;
      int ret;
      u16 pkey_index;

      ret = -ENOMEM;
      qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
      if (!qp_attr)
            goto out;

      if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
            clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
            ret = -ENXIO;
            goto out;
      }
      set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);

      /* set correct QKey for QP */
      qp_attr->qkey = priv->qkey;
      ret = ib_modify_qp(priv->qp, qp_attr, IB_QP_QKEY);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP, ret = %d\n", ret);
            goto out;
      }

      /* attach QP to multicast group */
      mutex_lock(&priv->mcast_mutex);
      ret = ib_attach_mcast(priv->qp, mgid, mlid);
      mutex_unlock(&priv->mcast_mutex);
      if (ret)
            ipoib_warn(priv, "failed to attach to multicast group, ret = %d\n", ret);

out:
      kfree(qp_attr);
      return ret;
}

int ipoib_mcast_detach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int ret;

      mutex_lock(&priv->mcast_mutex);
      ret = ib_detach_mcast(priv->qp, mgid, mlid);
      mutex_unlock(&priv->mcast_mutex);
      if (ret)
            ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);

      return ret;
}

int ipoib_init_qp(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      int ret;
      struct ib_qp_attr qp_attr;
      int attr_mask;

      if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
            return -1;

      qp_attr.qp_state = IB_QPS_INIT;
      qp_attr.qkey = 0;
      qp_attr.port_num = priv->port;
      qp_attr.pkey_index = priv->pkey_index;
      attr_mask =
          IB_QP_QKEY |
          IB_QP_PORT |
          IB_QP_PKEY_INDEX |
          IB_QP_STATE;
      ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to init, ret = %d\n", ret);
            goto out_fail;
      }

      qp_attr.qp_state = IB_QPS_RTR;
      /* Can't set this in a INIT->RTR transition */
      attr_mask &= ~IB_QP_PORT;
      ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTR, ret = %d\n", ret);
            goto out_fail;
      }

      qp_attr.qp_state = IB_QPS_RTS;
      qp_attr.sq_psn = 0;
      attr_mask |= IB_QP_SQ_PSN;
      attr_mask &= ~IB_QP_PKEY_INDEX;
      ret = ib_modify_qp(priv->qp, &qp_attr, attr_mask);
      if (ret) {
            ipoib_warn(priv, "failed to modify QP to RTS, ret = %d\n", ret);
            goto out_fail;
      }

      return 0;

out_fail:
      qp_attr.qp_state = IB_QPS_RESET;
      if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
            ipoib_warn(priv, "Failed to modify QP to RESET state\n");

      return ret;
}

int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);
      struct ib_qp_init_attr init_attr = {
            .cap = {
                  .max_send_wr  = ipoib_sendq_size,
                  .max_recv_wr  = ipoib_recvq_size,
                  .max_send_sge = 1,
                  .max_recv_sge = 1
            },
            .sq_sig_type = IB_SIGNAL_ALL_WR,
            .qp_type     = IB_QPT_UD
      };

      int ret, size;

      priv->pd = ib_alloc_pd(priv->ca);
      if (IS_ERR(priv->pd)) {
            printk(KERN_WARNING "%s: failed to allocate PD\n", ca->name);
            return -ENODEV;
      }

      priv->mr = ib_get_dma_mr(priv->pd, IB_ACCESS_LOCAL_WRITE);
      if (IS_ERR(priv->mr)) {
            printk(KERN_WARNING "%s: ib_get_dma_mr failed\n", ca->name);
            goto out_free_pd;
      }

      size = ipoib_sendq_size + ipoib_recvq_size + 1;
      ret = ipoib_cm_dev_init(dev);
      if (!ret)
            size += ipoib_recvq_size + 1 /* 1 extra for rx_drain_qp */;

      priv->cq = ib_create_cq(priv->ca, ipoib_ib_completion, NULL, dev, size, 0);
      if (IS_ERR(priv->cq)) {
            printk(KERN_WARNING "%s: failed to create CQ\n", ca->name);
            goto out_free_mr;
      }

      if (ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP))
            goto out_free_cq;

      init_attr.send_cq = priv->cq;
      init_attr.recv_cq = priv->cq;

      priv->qp = ib_create_qp(priv->pd, &init_attr);
      if (IS_ERR(priv->qp)) {
            printk(KERN_WARNING "%s: failed to create QP\n", ca->name);
            goto out_free_cq;
      }

      priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
      priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
      priv->dev->dev_addr[3] = (priv->qp->qp_num      ) & 0xff;

      priv->tx_sge.lkey       = priv->mr->lkey;

      priv->tx_wr.opcode      = IB_WR_SEND;
      priv->tx_wr.sg_list     = &priv->tx_sge;
      priv->tx_wr.num_sge     = 1;
      priv->tx_wr.send_flags  = IB_SEND_SIGNALED;

      return 0;

out_free_cq:
      ib_destroy_cq(priv->cq);

out_free_mr:
      ib_dereg_mr(priv->mr);
      ipoib_cm_dev_cleanup(dev);

out_free_pd:
      ib_dealloc_pd(priv->pd);
      return -ENODEV;
}

void ipoib_transport_dev_cleanup(struct net_device *dev)
{
      struct ipoib_dev_priv *priv = netdev_priv(dev);

      if (priv->qp) {
            if (ib_destroy_qp(priv->qp))
                  ipoib_warn(priv, "ib_qp_destroy failed\n");

            priv->qp = NULL;
            clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
      }

      if (ib_destroy_cq(priv->cq))
            ipoib_warn(priv, "ib_cq_destroy failed\n");

      ipoib_cm_dev_cleanup(dev);

      if (ib_dereg_mr(priv->mr))
            ipoib_warn(priv, "ib_dereg_mr failed\n");

      if (ib_dealloc_pd(priv->pd))
            ipoib_warn(priv, "ib_dealloc_pd failed\n");
}

void ipoib_event(struct ib_event_handler *handler,
             struct ib_event *record)
{
      struct ipoib_dev_priv *priv =
            container_of(handler, struct ipoib_dev_priv, event_handler);

      if (record->element.port_num != priv->port)
            return;

      if (record->event == IB_EVENT_PORT_ERR    ||
          record->event == IB_EVENT_PORT_ACTIVE ||
          record->event == IB_EVENT_LID_CHANGE  ||
          record->event == IB_EVENT_SM_CHANGE   ||
          record->event == IB_EVENT_CLIENT_REREGISTER) {
            ipoib_dbg(priv, "Port state change event\n");
            queue_work(ipoib_workqueue, &priv->flush_task);
      } else if (record->event == IB_EVENT_PKEY_CHANGE) {
            ipoib_dbg(priv, "P_Key change event on port:%d\n", priv->port);
            queue_work(ipoib_workqueue, &priv->pkey_event_task);
      }
}

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