ib_agent.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
    3  *
    4  * Copyright (c) 2004, 2005 Mellanox Technologies Ltd.  All rights reserved.
    5  * Copyright (c) 2004, 2005 Infinicon Corporation.  All rights reserved.
    6  * Copyright (c) 2004, 2005 Intel Corporation.  All rights reserved.
    7  * Copyright (c) 2004, 2005 Topspin Corporation.  All rights reserved.
    8  * Copyright (c) 2004-2007 Voltaire Corporation.  All rights reserved.
    9  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   10  *
   11  * This software is available to you under a choice of one of two
   12  * licenses.  You may choose to be licensed under the terms of the GNU
   13  * General Public License (GPL) Version 2, available from the file
   14  * COPYING in the main directory of this source tree, or the
   15  * OpenIB.org BSD license below:
   16  *
   17  *     Redistribution and use in source and binary forms, with or
   18  *     without modification, are permitted provided that the following
   19  *     conditions are met:
   20  *
   21  *      - Redistributions of source code must retain the above
   22  *        copyright notice, this list of conditions and the following
   23  *        disclaimer.
   24  *
   25  *      - Redistributions in binary form must reproduce the above
   26  *        copyright notice, this list of conditions and the following
   27  *        disclaimer in the documentation and/or other materials
   28  *        provided with the distribution.
   29  *
   30  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   31  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   32  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   33  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   34  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   35  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   36  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   37  * SOFTWARE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 #include <linux/slab.h>
   44 #include <linux/string.h>
   45 
   46 #include "agent.h"
   47 #include "smi.h"
   48 #include "mad_priv.h"
   49 
   50 #define SPFX "ib_agent: "
   51 
   52 struct ib_agent_port_private {
   53         struct list_head port_list;
   54         struct ib_mad_agent *agent[2];
   55 };
   56 
   57 static DEFINE_SPINLOCK(ib_agent_port_list_lock);
   58 static LIST_HEAD(ib_agent_port_list);
   59 
   60 static struct ib_agent_port_private *
   61 __ib_get_agent_port(const struct ib_device *device, int port_num)
   62 {
   63         struct ib_agent_port_private *entry;
   64 
   65         list_for_each_entry(entry, &ib_agent_port_list, port_list) {
   66                 if (entry->agent[1]->device == device &&
   67                     entry->agent[1]->port_num == port_num)
   68                         return entry;
   69         }
   70         return NULL;
   71 }
   72 
   73 static struct ib_agent_port_private *
   74 ib_get_agent_port(const struct ib_device *device, int port_num)
   75 {
   76         struct ib_agent_port_private *entry;
   77         unsigned long flags;
   78 
   79         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
   80         entry = __ib_get_agent_port(device, port_num);
   81         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
   82         return entry;
   83 }
   84 
   85 void agent_send_response(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,
   86                          const struct ib_wc *wc, const struct ib_device *device,
   87                          int port_num, int qpn, size_t resp_mad_len, bool opa)
   88 {
   89         struct ib_agent_port_private *port_priv;
   90         struct ib_mad_agent *agent;
   91         struct ib_mad_send_buf *send_buf;
   92         struct ib_ah *ah;
   93         struct ib_mad_send_wr_private *mad_send_wr;
   94 
   95         if (rdma_cap_ib_switch(device))
   96                 port_priv = ib_get_agent_port(device, 0);
   97         else
   98                 port_priv = ib_get_agent_port(device, port_num);
   99 
  100         if (!port_priv) {
  101                 dev_err(&device->dev, "Unable to find port agent\n");
  102                 return;
  103         }
  104 
  105         agent = port_priv->agent[qpn];
  106         ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);
  107         if (IS_ERR(ah)) {
  108                 dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",
  109                         PTR_ERR(ah));
  110                 return;
  111         }
  112 
  113         if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)
  114                 resp_mad_len = IB_MGMT_MAD_SIZE;
  115 
  116         send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,
  117                                       IB_MGMT_MAD_HDR,
  118                                       resp_mad_len - IB_MGMT_MAD_HDR,
  119                                       GFP_KERNEL,
  120                                       mad_hdr->base_version);
  121         if (IS_ERR(send_buf)) {
  122                 dev_err(&device->dev, "ib_create_send_mad error\n");
  123                 goto err1;
  124         }
  125 
  126         memcpy(send_buf->mad, mad_hdr, resp_mad_len);
  127         send_buf->ah = ah;
  128 
  129         if (rdma_cap_ib_switch(device)) {
  130                 mad_send_wr = container_of(send_buf,
  131                                            struct ib_mad_send_wr_private,
  132                                            send_buf);
  133                 mad_send_wr->send_wr.port_num = port_num;
  134         }
  135 
  136         if (ib_post_send_mad(send_buf, NULL)) {
  137                 dev_err(&device->dev, "ib_post_send_mad error\n");
  138                 goto err2;
  139         }
  140         return;
  141 err2:
  142         ib_free_send_mad(send_buf);
  143 err1:
  144         ib_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
  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, RDMA_DESTROY_AH_SLEEPABLE);
  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                 dev_err(&device->dev, "No memory for ib_agent_port_private\n");
  164                 ret = -ENOMEM;
  165                 goto error1;
  166         }
  167 
  168         if (rdma_cap_ib_smi(device, port_num)) {
  169                 /* Obtain send only MAD agent for SMI QP */
  170                 port_priv->agent[0] = ib_register_mad_agent(device, port_num,
  171                                                             IB_QPT_SMI, NULL, 0,
  172                                                             &agent_send_handler,
  173                                                             NULL, NULL, 0);
  174                 if (IS_ERR(port_priv->agent[0])) {
  175                         ret = PTR_ERR(port_priv->agent[0]);
  176                         goto error2;
  177                 }
  178         }
  179 
  180         /* Obtain send only MAD agent for GSI QP */
  181         port_priv->agent[1] = ib_register_mad_agent(device, port_num,
  182                                                     IB_QPT_GSI, NULL, 0,
  183                                                     &agent_send_handler,
  184                                                     NULL, NULL, 0);
  185         if (IS_ERR(port_priv->agent[1])) {
  186                 ret = PTR_ERR(port_priv->agent[1]);
  187                 goto error3;
  188         }
  189 
  190         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
  191         list_add_tail(&port_priv->port_list, &ib_agent_port_list);
  192         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
  193 
  194         return 0;
  195 
  196 error3:
  197         if (port_priv->agent[0])
  198                 ib_unregister_mad_agent(port_priv->agent[0]);
  199 error2:
  200         kfree(port_priv);
  201 error1:
  202         return ret;
  203 }
  204 
  205 int ib_agent_port_close(struct ib_device *device, int port_num)
  206 {
  207         struct ib_agent_port_private *port_priv;
  208         unsigned long flags;
  209 
  210         spin_lock_irqsave(&ib_agent_port_list_lock, flags);
  211         port_priv = __ib_get_agent_port(device, port_num);
  212         if (port_priv == NULL) {
  213                 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
  214                 dev_err(&device->dev, "Port %d not found\n", port_num);
  215                 return -ENODEV;
  216         }
  217         list_del(&port_priv->port_list);
  218         spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);
  219 
  220         ib_unregister_mad_agent(port_priv->agent[1]);
  221         if (port_priv->agent[0])
  222                 ib_unregister_mad_agent(port_priv->agent[0]);
  223 
  224         kfree(port_priv);
  225         return 0;
  226 }

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FreeBSD/Linux Kernel Cross Reference sys/ofed/drivers/infiniband/core/ib_agent.c

FreeBSD/Linux Kernel Cross Reference
sys/ofed/drivers/infiniband/core/ib_agent.c