linux/drivers/infiniband/core/agent.c
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   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
  48struct ib_agent_port_private {
  49        struct list_head port_list;
  50        struct ib_mad_agent *agent[2];
  51};
  52
  53static DEFINE_SPINLOCK(ib_agent_port_list_lock);
  54static LIST_HEAD(ib_agent_port_list);
  55
  56static struct ib_agent_port_private *
  57__ib_get_agent_port(const 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[1]->device == device &&
  63                    entry->agent[1]->port_num == port_num)
  64                        return entry;
  65        }
  66        return NULL;
  67}
  68
  69static struct ib_agent_port_private *
  70ib_get_agent_port(const 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
  81void agent_send_response(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,
  82                         const struct ib_wc *wc, const struct ib_device *device,
  83                         int port_num, int qpn, size_t resp_mad_len, bool opa)
  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        struct ib_mad_send_wr_private *mad_send_wr;
  90
  91        if (rdma_cap_ib_switch(device))
  92                port_priv = ib_get_agent_port(device, 0);
  93        else
  94                port_priv = ib_get_agent_port(device, port_num);
  95
  96        if (!port_priv) {
  97                dev_err(&device->dev, "Unable to find port agent\n");
  98                return;
  99        }
 100
 101        agent = port_priv->agent[qpn];
 102        ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
 103        if (IS_ERR(ah)) {
 104                dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
 105                        PTR_ERR(ah));
 106                return;
 107        }
 108
 109        if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
 110                resp_mad_len = IB_MGMT_MAD_SIZE;
 111
 112        send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
 113                                      IB_MGMT_MAD_HDR,
 114                                      resp_mad_len - IB_MGMT_MAD_HDR,
 115                                      GFP_KERNEL,
 116                                      mad_hdr->base_version);
 117        if (IS_ERR(send_buf)) {
 118                dev_err(&device->dev, "ib_create_send_mad error\n");
 119                goto err1;
 120        }
 121
 122        memcpy(send_buf->mad, mad_hdr, resp_mad_len);
 123        send_buf->ah = ah;
 124
 125        if (rdma_cap_ib_switch(device)) {
 126                mad_send_wr = container_of(send_buf,
 127                                           struct ib_mad_send_wr_private,
 128                                           send_buf);
 129                mad_send_wr->send_wr.wr.ud.port_num = port_num;
 130        }
 131
 132        if (ib_post_send_mad(send_buf, NULL)) {
 133                dev_err(&device->dev, "ib_post_send_mad error\n");
 134                goto err2;
 135        }
 136        return;
 137err2:
 138        ib_free_send_mad(send_buf);
 139err1:
 140        ib_destroy_ah(ah);
 141}
 142
 143static void agent_send_handler(struct ib_mad_agent *mad_agent,
 144                               struct ib_mad_send_wc *mad_send_wc)
 145{
 146        ib_destroy_ah(mad_send_wc->send_buf->ah);
 147        ib_free_send_mad(mad_send_wc->send_buf);
 148}
 149
 150int ib_agent_port_open(struct ib_device *device, int port_num)
 151{
 152        struct ib_agent_port_private *port_priv;
 153        unsigned long flags;
 154        int ret;
 155
 156        /* Create new device info */
 157        port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);
 158        if (!port_priv) {
 159                dev_err(&device->dev, "No memory for ib_agent_port_private\n");
 160                ret = -ENOMEM;
 161                goto error1;
 162        }
 163
 164        if (rdma_cap_ib_smi(device, port_num)) {
 165                /* Obtain send only MAD agent for SMI QP */
 166                port_priv->agent[0] = ib_register_mad_agent(device, port_num,
 167                                                            IB_QPT_SMI, NULL, 0,
 168                                                            &agent_send_handler,
 169                                                            NULL, NULL, 0);
 170                if (IS_ERR(port_priv->agent[0])) {
 171                        ret = PTR_ERR(port_priv->agent[0]);
 172                        goto error2;
 173                }
 174        }
 175
 176        /* Obtain send only MAD agent for GSI QP */
 177        port_priv->agent[1] = ib_register_mad_agent(device, port_num,
 178                                                    IB_QPT_GSI, NULL, 0,
 179                                                    &agent_send_handler,
 180                                                    NULL, NULL, 0);
 181        if (IS_ERR(port_priv->agent[1])) {
 182                ret = PTR_ERR(port_priv->agent[1]);
 183                goto error3;
 184        }
 185
 186        spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 187        list_add_tail(&port_priv->port_list, &ib_agent_port_list);
 188        spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 189
 190        return 0;
 191
 192error3:
 193        if (port_priv->agent[0])
 194                ib_unregister_mad_agent(port_priv->agent[0]);
 195error2:
 196        kfree(port_priv);
 197error1:
 198        return ret;
 199}
 200
 201int ib_agent_port_close(struct ib_device *device, int port_num)
 202{
 203        struct ib_agent_port_private *port_priv;
 204        unsigned long flags;
 205
 206        spin_lock_irqsave(&ib_agent_port_list_lock, flags);
 207        port_priv = __ib_get_agent_port(device, port_num);
 208        if (port_priv == NULL) {
 209                spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 210                dev_err(&device->dev, "Port %d not found\n", port_num);
 211                return -ENODEV;
 212        }
 213        list_del(&port_priv->port_list);
 214        spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
 215
 216        ib_unregister_mad_agent(port_priv->agent[1]);
 217        if (port_priv->agent[0])
 218                ib_unregister_mad_agent(port_priv->agent[0]);
 219
 220        kfree(port_priv);
 221        return 0;
 222}
 223