ipoib_verbs.c

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/*
 * 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.
 */

#include <linux/slab.h>

#include "ipoib.h"

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

    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);

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

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

out:
    kfree(qp_attr);
    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 = IPOIB_UD_RX_SG
        },
        .sq_sig_type = IB_SIGNAL_ALL_WR,
        .qp_type     = IB_QPT_UD
    };

    int ret, size;
    int i;

    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_recvq_size + 1;
    ret = ipoib_cm_dev_init(dev);
    if (!ret) {
        size += ipoib_sendq_size;
        if (ipoib_cm_has_srq(dev))
            size += ipoib_recvq_size + 1; /* 1 extra for rx_drain_qp */
        else
            size += ipoib_recvq_size * ipoib_max_conn_qp;
    }

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

    priv->send_cq = ib_create_cq(priv->ca, ipoib_send_comp_handler, NULL,
                     dev, ipoib_sendq_size, 0);
    if (IS_ERR(priv->send_cq)) {
        printk(KERN_WARNING "%s: failed to create send CQ\n", ca->name);
        goto out_free_recv_cq;
    }

    if (ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP))
        goto out_free_send_cq;

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

    if (priv->hca_caps & IB_DEVICE_UD_TSO)
        init_attr.create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;

    if (priv->hca_caps & IB_DEVICE_BLOCK_MULTICAST_LOOPBACK)
        init_attr.create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;

    if (dev->features & NETIF_F_SG)
        init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;

    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_send_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;

    for (i = 0; i < MAX_SKB_FRAGS + 1; ++i)
        priv->tx_sge[i].lkey = priv->mr->lkey;

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

    priv->rx_sge[0].lkey = priv->mr->lkey;
    if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
        priv->rx_sge[0].length = IPOIB_UD_HEAD_SIZE;
        priv->rx_sge[1].length = PAGE_SIZE;
        priv->rx_sge[1].lkey = priv->mr->lkey;
        priv->rx_wr.num_sge = IPOIB_UD_RX_SG;
    } else {
        priv->rx_sge[0].length = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
        priv->rx_wr.num_sge = 1;
    }
    priv->rx_wr.next = NULL;
    priv->rx_wr.sg_list = priv->rx_sge;

    return 0;

out_free_send_cq:
    ib_destroy_cq(priv->send_cq);

out_free_recv_cq:
    ib_destroy_cq(priv->recv_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->send_cq))
        ipoib_warn(priv, "ib_cq_destroy (send) failed\n");

    if (ib_destroy_cq(priv->recv_cq))
        ipoib_warn(priv, "ib_cq_destroy (recv) 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;

    ipoib_dbg(priv, "Event %d on device %s port %d\n", record->event,
          record->device->name, record->element.port_num);

    if (record->event == IB_EVENT_SM_CHANGE ||
        record->event == IB_EVENT_CLIENT_REREGISTER) {
        queue_work(ipoib_workqueue, &priv->flush_light);
    } else if (record->event == IB_EVENT_PORT_ERR ||
           record->event == IB_EVENT_PORT_ACTIVE ||
           record->event == IB_EVENT_LID_CHANGE) {
        queue_work(ipoib_workqueue, &priv->flush_normal);
    } else if (record->event == IB_EVENT_PKEY_CHANGE) {
        queue_work(ipoib_workqueue, &priv->flush_heavy);
    }
}