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 smi_check_local_dr_smp(struct ib_smp *smp,
  82                            struct ib_device *device,
  83                            int port_num)
  84 {
  85         struct ib_agent_port_private *port_priv;
  86
  87         if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
  88                 return 1;
  89
  90         port_priv = ib_get_agent_port(device, port_num);
  91         if (!port_priv) {
  92                 printk(KERN_DEBUG SPFX "smi_check_local_dr_smp %s port %d "
  93                        "not open\n", device->name, port_num);
  94                 return 1;
  95         }
  96
  97         return smi_check_local_smp(port_priv->agent[0], smp);
  98 }
  99
 100 int agent_send_response(struct ib_mad *mad, struct ib_grh *grh,
 101                         struct ib_wc *wc, struct ib_device *device,
 102                         int port_num, int qpn)
 103 {
 104         struct ib_agent_port_private *port_priv;
 105         struct ib_mad_agent *agent;
 106         struct ib_mad_send_buf *send_buf;
 107         struct ib_ah *ah;
 108         int ret;
 109
 110         port_priv = ib_get_agent_port(device, port_num);
 111         if (!port_priv) {
 112                 printk(KERN_ERR SPFX "Unable to find port agent\n");
 113                 return -ENODEV;
 114         }
 115
 116         agent = port_priv->agent[qpn];
 117         ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
 118         if (IS_ERR(ah)) {
 119                 ret = PTR_ERR(ah);
 120                 printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
 121                 return ret;
 122         }
 123
 124         send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
 125                                       IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 126                                       GFP_KERNEL);
 127         if (IS_ERR(send_buf)) {
 128                 ret = PTR_ERR(send_buf);
 129                 printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
 130                 goto err1;
 131         }
 132
 133         memcpy(send_buf->mad, mad, sizeof *mad);
 134         send_buf->ah = ah;
 135         if ((ret = ib_post_send_mad(send_buf, NULL))) {
 136                 printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
 137                 goto err2;
 138         }
 139         return 0;
 140 err2:
 141         ib_free_send_mad(send_buf);
 142 err1:
 143         ib_destroy_ah(ah);
 144         return ret;
 145 }
 146
 147 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 148                                struct ib_mad_send_wc *mad_send_wc)
 149 {
 150         ib_destroy_ah(mad_send_wc->send_buf->ah);
 151         ib_free_send_mad(mad_send_wc->send_buf);
 152 }
 153
 154 int ib_agent_port_open(struct ib_device *device, int port_num)
 155 {
 156         struct ib_agent_port_private *port_priv;
 157         unsigned long flags;
 158         int ret;
 159
 160         /* Create new device info */
 161         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
 162         if (!port_priv) {
 163                 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 164                 ret = -ENOMEM;
 165                 goto error1;
 166         }
 167
 168         /* Obtain send only MAD agent for SMI QP */
 169         port_priv->agent[0] = ib_register_mad_agent(device, port_num,
 170                                                     IB_QPT_SMI, NULL, 0,
 171                                                     &agent_send_handler,
 172                                                     NULL, NULL);
 173         if (IS_ERR(port_priv->agent[0])) {
 174                 ret = PTR_ERR(port_priv->agent[0]);
 175                 goto error2;
 176         }
 177
 178         /* Obtain send only MAD agent for GSI QP */
 179         port_priv->agent[1] = ib_register_mad_agent(device, port_num,
 180                                                     IB_QPT_GSI, NULL, 0,
 181                                                     &agent_send_handler,
 182                                                     NULL, NULL);
 183         if (IS_ERR(port_priv->agent[1])) {
 184                 ret = PTR_ERR(port_priv->agent[1]);
 185                 goto error3;
 186         }
 187
 188         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 189         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 190         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 191
 192         return 0;
 193
 194 error3:
 195         ib_unregister_mad_agent(port_priv->agent[0]);
 196 error2:
 197         kfree(port_priv);
 198 error1:
 199         return ret;
 200 }
 201
 202 int ib_agent_port_close(struct ib_device *device, int port_num)
 203 {
 204         struct ib_agent_port_private *port_priv;
 205         unsigned long flags;
 206
 207         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 208         port_priv = __ib_get_agent_port(device, port_num);
 209         if (port_priv == NULL) {
 210                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 211                 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 212                 return -ENODEV;
 213         }
 214         list_del(&port_priv->port_list);
 215         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 216
 217         ib_unregister_mad_agent(port_priv->agent[1]);
 218         ib_unregister_mad_agent(port_priv->agent[0]);
 219         kfree(port_priv);
 220         return 0;
 221 }