drivers/infiniband/core/agent.c

   1 /*
   2  * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004, 2005 Voltaire Corporation.  All rights reserved.
   7  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  *
  37  * $Id: agent.c 1389 2004-12-27 22:56:47Z roland $
  38  */
  39
  40 #include <linux/slab.h>
  41 #include <linux/string.h>
  42
  43 #include "agent.h"
  44 #include "smi.h"
  45
  46 #define SPFX "ib_agent: "
  47
  48 struct ib_agent_port_private {
  49         struct list_head port_list;
  50         struct ib_mad_agent *agent[2];
  51 };
  52
  53 static DEFINE_SPINLOCK(ib_agent_port_list_lock);
  54 static LIST_HEAD(ib_agent_port_list);
  55
  56 static struct ib_agent_port_private *
  57 __ib_get_agent_port(struct ib_device *device, int port_num)
  58 {
  59         struct ib_agent_port_private *entry;
  60
  61         list_for_each_entry(entry, &ib_agent_port_list, port_list) {
  62                 if (entry->agent[0]->device == device &&
  63                     entry->agent[0]->port_num == port_num)
  64                         return entry;
  65         }
  66         return NULL;
  67 }
  68
  69 static struct ib_agent_port_private *
  70 ib_get_agent_port(struct ib_device *device, int port_num)
  71 {
  72         struct ib_agent_port_private *entry;
  73         unsigned long flags;
  74
  75         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
  76         entry = __ib_get_agent_port(device, port_num);
  77         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
  78         return entry;
  79 }
  80
  81 int agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
  82                         struct ib_wc *wc, struct ib_device *device,
  83                         int port_num, int qpn)
  84 {
  85         struct ib_agent_port_private *port_priv;
  86         struct ib_mad_agent *agent;
  87         struct ib_mad_send_buf *send_buf;
  88         struct ib_ah *ah;
  89         int ret;
  90
  91         port_priv = ib_get_agent_port(device, port_num);
  92         if (!port_priv) {
  93                 printk(KERN_ERR SPFX "Unable to find port agent\n");
  94                 return -ENODEV;
  95         }
  96
  97         agent = port_priv->agent[qpn];
  98         ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
  99         if (IS_ERR(ah)) {
 100                 ret = PTR_ERR(ah);
 101                 printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
 102                 return ret;
 103         }
 104
 105         send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
 106                                       IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 107                                       GFP_KERNEL);
 108         if (IS_ERR(send_buf)) {
 109                 ret = PTR_ERR(send_buf);
 110                 printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
 111                 goto err1;
 112         }
 113
 114         memcpy(send_buf->mad, mad, sizeof *mad);
 115         send_buf->ah = ah;
 116         if ((ret = ib_post_send_mad(send_buf, NULL))) {
 117                 printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
 118                 goto err2;
 119         }
 120         return 0;
 121 err2:
 122         ib_free_send_mad(send_buf);
 123 err1:
 124         ib_destroy_ah(ah);
 125         return ret;
 126 }
 127
 128 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 129                                struct ib_mad_send_wc *mad_send_wc)
 130 {
 131         ib_destroy_ah(mad_send_wc->send_buf->ah);
 132         ib_free_send_mad(mad_send_wc->send_buf);
 133 }
 134
 135 int ib_agent_port_open(struct ib_device *device, int port_num)
 136 {
 137         struct ib_agent_port_private *port_priv;
 138         unsigned long flags;
 139         int ret;
 140
 141         /* Create new device info */
 142         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
 143         if (!port_priv) {
 144                 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 145                 ret = -ENOMEM;
 146                 goto error1;
 147         }
 148
 149         /* Obtain send only MAD agent for SMI QP */
 150         port_priv->agent[0] = ib_register_mad_agent(device, port_num,
 151                                                     IB_QPT_SMI, NULL, 0,
 152                                                     &agent_send_handler,
 153                                                     NULL, NULL);
 154         if (IS_ERR(port_priv->agent[0])) {
 155                 ret = PTR_ERR(port_priv->agent[0]);
 156                 goto error2;
 157         }
 158
 159         /* Obtain send only MAD agent for GSI QP */
 160         port_priv->agent[1] = ib_register_mad_agent(device, port_num,
 161                                                     IB_QPT_GSI, NULL, 0,
 162                                                     &agent_send_handler,
 163                                                     NULL, NULL);
 164         if (IS_ERR(port_priv->agent[1])) {
 165                 ret = PTR_ERR(port_priv->agent[1]);
 166                 goto error3;
 167         }
 168
 169         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 170         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 171         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 172
 173         return 0;
 174
 175 error3:
 176         ib_unregister_mad_agent(port_priv->agent[0]);
 177 error2:
 178         kfree(port_priv);
 179 error1:
 180         return ret;
 181 }
 182
 183 int ib_agent_port_close(struct ib_device *device, int port_num)
 184 {
 185         struct ib_agent_port_private *port_priv;
 186         unsigned long flags;
 187
 188         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 189         port_priv = __ib_get_agent_port(device, port_num);
 190         if (port_priv == NULL) {
 191                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 192                 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 193                 return -ENODEV;
 194         }
 195         list_del(&port_priv->port_list);
 196         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 197
 198         ib_unregister_mad_agent(port_priv->agent[1]);
 199         ib_unregister_mad_agent(port_priv->agent[0]);
 200         kfree(port_priv);
 201         return 0;
 202 }