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) 2004-2007 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  */
  38
  39 #include <linux/slab.h>
  40 #include <linux/string.h>
  41
  42 #include "agent.h"
  43 #include "smi.h"
  44 #include "mad_priv.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         struct ib_mad_send_wr_private *mad_send_wr;
  91
  92         if (device->node_type == RDMA_NODE_IB_SWITCH)
  93                 port_priv = ib_get_agent_port(device, 0);
  94         else
  95                 port_priv = ib_get_agent_port(device, port_num);
  96
  97         if (!port_priv) {
  98                 printk(KERN_ERR SPFX "Unable to find port agent\n");
  99                 return -ENODEV;
 100         }
 101
 102         agent = port_priv->agent[qpn];
 103         ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
 104         if (IS_ERR(ah)) {
 105                 ret = PTR_ERR(ah);
 106                 printk(KERN_ERR SPFX "ib_create_ah_from_wc error:%d\n", ret);
 107                 return ret;
 108         }
 109
 110         send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
 111                                       IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
 112                                       GFP_KERNEL);
 113         if (IS_ERR(send_buf)) {
 114                 ret = PTR_ERR(send_buf);
 115                 printk(KERN_ERR SPFX "ib_create_send_mad error:%d\n", ret);
 116                 goto err1;
 117         }
 118
 119         memcpy(send_buf->mad, mad, sizeof *mad);
 120         send_buf->ah = ah;
 121
 122         if (device->node_type == RDMA_NODE_IB_SWITCH) {
 123                 mad_send_wr = container_of(send_buf,
 124                                            struct ib_mad_send_wr_private,
 125                                            send_buf);
 126                 mad_send_wr->send_wr.wr.ud.port_num = port_num;
 127         }
 128
 129         if ((ret = ib_post_send_mad(send_buf, NULL))) {
 130                 printk(KERN_ERR SPFX "ib_post_send_mad error:%d\n", ret);
 131                 goto err2;
 132         }
 133         return 0;
 134 err2:
 135         ib_free_send_mad(send_buf);
 136 err1:
 137         ib_destroy_ah(ah);
 138         return ret;
 139 }
 140
 141 static void agent_send_handler(struct ib_mad_agent *mad_agent,
 142                                struct ib_mad_send_wc *mad_send_wc)
 143 {
 144         ib_destroy_ah(mad_send_wc->send_buf->ah);
 145         ib_free_send_mad(mad_send_wc->send_buf);
 146 }
 147
 148 int ib_agent_port_open(struct ib_device *device, int port_num)
 149 {
 150         struct ib_agent_port_private *port_priv;
 151         unsigned long flags;
 152         int ret;
 153
 154         /* Create new device info */
 155         port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
 156         if (!port_priv) {
 157                 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n");
 158                 ret = -ENOMEM;
 159                 goto error1;
 160         }
 161
 162         /* Obtain send only MAD agent for SMI QP */
 163         port_priv->agent[0] = ib_register_mad_agent(device, port_num,
 164                                                     IB_QPT_SMI, NULL, 0,
 165                                                     &agent_send_handler,
 166                                                     NULL, NULL);
 167         if (IS_ERR(port_priv->agent[0])) {
 168                 ret = PTR_ERR(port_priv->agent[0]);
 169                 goto error2;
 170         }
 171
 172         /* Obtain send only MAD agent for GSI QP */
 173         port_priv->agent[1] = ib_register_mad_agent(device, port_num,
 174                                                     IB_QPT_GSI, NULL, 0,
 175                                                     &agent_send_handler,
 176                                                     NULL, NULL);
 177         if (IS_ERR(port_priv->agent[1])) {
 178                 ret = PTR_ERR(port_priv->agent[1]);
 179                 goto error3;
 180         }
 181
 182         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 183         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 184         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 185
 186         return 0;
 187
 188 error3:
 189         ib_unregister_mad_agent(port_priv->agent[0]);
 190 error2:
 191         kfree(port_priv);
 192 error1:
 193         return ret;
 194 }
 195
 196 int ib_agent_port_close(struct ib_device *device, int port_num)
 197 {
 198         struct ib_agent_port_private *port_priv;
 199         unsigned long flags;
 200
 201         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 202         port_priv = __ib_get_agent_port(device, port_num);
 203         if (port_priv == NULL) {
 204                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 205                 printk(KERN_ERR SPFX "Port %d not found\n", port_num);
 206                 return -ENODEV;
 207         }
 208         list_del(&port_priv->port_list);
 209         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 210
 211         ib_unregister_mad_agent(port_priv->agent[1]);
 212         ib_unregister_mad_agent(port_priv->agent[0]);
 213         kfree(port_priv);
 214         return 0;
 215 }