agent.c

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/*
 * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
 * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2004-2007 Voltaire Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. 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 <linux/string.h>

#include "agent.h"
#include "smi.h"
#include "mad_priv.h"

#define SPFX "ib_agent: "

struct ib_agent_port_private {
    struct list_head port_list;
    struct ib_mad_agent *agent[2];
};

static DEFINE_SPINLOCK(ib_agent_port_list_lock);
static LIST_HEAD(ib_agent_port_list);

static struct ib_agent_port_private *
__ib_get_agent_port(struct ib_device *device, int port_num)
{
    struct ib_agent_port_private *entry;

    list_for_each_entry(entry, &ib_agent_port_list, port_list) {
        if (entry->agent[1]->device == device &&
            entry->agent[1]->port_num == port_num)
            return entry;
    }
    return NULL;
}

static struct ib_agent_port_private *
ib_get_agent_port(struct ib_device *device, int port_num)
{
    struct ib_agent_port_private *entry;
    unsigned long flags;

    spin_lock_irqsave(&ib_agent_port_list_lock, flags);
    entry = __ib_get_agent_port(device, port_num);
    spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
    return entry;
}

void agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
             struct ib_wc *wc, struct ib_device *device,
             int port_num, int qpn)
{
    struct ib_agent_port_private *port_priv;
    struct ib_mad_agent *agent;
    struct ib_mad_send_buf *send_buf;
    struct ib_ah *ah;
    struct ib_mad_send_wr_private *mad_send_wr;

    if (device->node_type == RDMA_NODE_IB_SWITCH)
        port_priv = ib_get_agent_port(device, 0);
    else
        port_priv = ib_get_agent_port(device, port_num);

    if (!port_priv) {
        printk(KERN_ERR SPFX "Unable to find port agent\n");
        return;
    }

    agent = port_priv->agent[qpn];
    ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
    if (IS_ERR(ah)) {
        printk(KERN_ERR SPFX "ib_create_ah_from_wc error %ld\n",
            PTR_ERR(ah));
        return;
    }

    send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
                      IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
                      GFP_KERNEL);
    if (IS_ERR(send_buf)) {
        printk(KERN_ERR SPFX "ib_create_send_mad error\n");
        goto err1;
    }

    memcpy(send_buf->mad, mad, sizeof *mad);
    send_buf->ah = ah;

    if (device->node_type == RDMA_NODE_IB_SWITCH) {
        mad_send_wr = container_of(send_buf,
                       struct ib_mad_send_wr_private,
                       send_buf);
        mad_send_wr->send_wr.wr.ud.port_num = port_num;
    }

    if (ib_post_send_mad(send_buf, NULL)) {
        printk(KERN_ERR SPFX "ib_post_send_mad error\n");
        goto err2;
    }
    return;
err2:
    ib_free_send_mad(send_buf);
err1:
    ib_destroy_ah(ah);
}

static void agent_send_handler(struct ib_mad_agent *mad_agent,
                   struct ib_mad_send_wc *mad_send_wc)
{
    ib_destroy_ah(mad_send_wc->send_buf->ah);
    ib_free_send_mad(mad_send_wc->send_buf);
}

int ib_agent_port_open(struct ib_device *device, int port_num)
{
    struct ib_agent_port_private *port_priv;
    unsigned long flags;
    int ret;

    /* Create new device info */
    port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
    if (!port_priv) {
        printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
        ret = -ENOMEM;
        goto error1;
    }

    if (rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND) {
        /* Obtain send only MAD agent for SMI QP */
        port_priv->agent[0] = ib_register_mad_agent(device, port_num,
                                IB_QPT_SMI, NULL, 0,
                                &agent_send_handler,
                                NULL, NULL);
        if (IS_ERR(port_priv->agent[0])) {
            ret = PTR_ERR(port_priv->agent[0]);
            goto error2;
        }
    }

    /* Obtain send only MAD agent for GSI QP */
    port_priv->agent[1] = ib_register_mad_agent(device, port_num,
                            IB_QPT_GSI, NULL, 0,
                            &agent_send_handler,
                            NULL, NULL);
    if (IS_ERR(port_priv->agent[1])) {
        ret = PTR_ERR(port_priv->agent[1]);
        goto error3;
    }

    spin_lock_irqsave(&ib_agent_port_list_lock, flags);
    list_add_tail(&port_priv->port_list, &ib_agent_port_list);
    spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

    return 0;

error3:
    if (port_priv->agent[0])
        ib_unregister_mad_agent(port_priv->agent[0]);
error2:
    kfree(port_priv);
error1:
    return ret;
}

int ib_agent_port_close(struct ib_device *device, int port_num)
{
    struct ib_agent_port_private *port_priv;
    unsigned long flags;

    spin_lock_irqsave(&ib_agent_port_list_lock, flags);
    port_priv = __ib_get_agent_port(device, port_num);
    if (port_priv == NULL) {
        spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
        printk(KERN_ERR SPFX "Port %d not found\n", port_num);
        return -ENODEV;
    }
    list_del(&port_priv->port_list);
    spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);

    ib_unregister_mad_agent(port_priv->agent[1]);
    if (port_priv->agent[0])
        ib_unregister_mad_agent(port_priv->agent[0]);

    kfree(port_priv);
    return 0;
}