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agent.c

/*
 * 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[0]->device == device &&
                entry->agent[0]->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\n");
            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;
      }

      /* 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:
      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]);
      ib_unregister_mad_agent(port_priv->agent[0]);
      kfree(port_priv);
      return 0;
}

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