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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 two10 * licenses. You may choose to be licensed under the terms of the GNU11 * General Public License (GPL) Version 2, available from the file12 * COPYING in the main directory of this source tree, or the13 * OpenIB.org BSD license below:14 *15 * Redistribution and use in source and binary forms, with or16 * without modification, are permitted provided that the following17 * conditions are met:18 *19 * - Redistributions of source code must retain the above20 * copyright notice, this list of conditions and the following21 * disclaimer.22 *23 * - Redistributions in binary form must reproduce the above24 * copyright notice, this list of conditions and the following25 * disclaimer in the documentation and/or other materials26 * 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 OF30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE35 * 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 /* Need to check both agent[0] and agent[1], as an agent port63 * may only have one of them64 */65 if (entry->agent[0] &&66 entry->agent[0]->device == device &&67 entry->agent[0]->port_num == port_num)68 return entry;69 70 if (entry->agent[1] &&71 entry->agent[1]->device == device &&72 entry->agent[1]->port_num == port_num)73 return entry;74 }75 return NULL;76}77 78static struct ib_agent_port_private *79ib_get_agent_port(const struct ib_device *device, int port_num)80{81 struct ib_agent_port_private *entry;82 unsigned long flags;83 84 spin_lock_irqsave(&ib_agent_port_list_lock, flags);85 entry = __ib_get_agent_port(device, port_num);86 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);87 return entry;88}89 90void agent_send_response(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh,91 const struct ib_wc *wc, const struct ib_device *device,92 int port_num, int qpn, size_t resp_mad_len, bool opa)93{94 struct ib_agent_port_private *port_priv;95 struct ib_mad_agent *agent;96 struct ib_mad_send_buf *send_buf;97 struct ib_ah *ah;98 struct ib_mad_send_wr_private *mad_send_wr;99 100 if (rdma_cap_ib_switch(device))101 port_priv = ib_get_agent_port(device, 0);102 else103 port_priv = ib_get_agent_port(device, port_num);104 105 if (!port_priv) {106 dev_err(&device->dev, "Unable to find port agent\n");107 return;108 }109 110 agent = port_priv->agent[qpn];111 ah = ib_create_ah_from_wc(agent->qp->pd, wc, grh, port_num);112 if (IS_ERR(ah)) {113 dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n",114 PTR_ERR(ah));115 return;116 }117 118 if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION)119 resp_mad_len = IB_MGMT_MAD_SIZE;120 121 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0,122 IB_MGMT_MAD_HDR,123 resp_mad_len - IB_MGMT_MAD_HDR,124 GFP_KERNEL,125 mad_hdr->base_version);126 if (IS_ERR(send_buf)) {127 dev_err(&device->dev, "ib_create_send_mad error\n");128 goto err1;129 }130 131 memcpy(send_buf->mad, mad_hdr, resp_mad_len);132 send_buf->ah = ah;133 134 if (rdma_cap_ib_switch(device)) {135 mad_send_wr = container_of(send_buf,136 struct ib_mad_send_wr_private,137 send_buf);138 mad_send_wr->send_wr.port_num = port_num;139 }140 141 if (ib_post_send_mad(send_buf, NULL)) {142 dev_err(&device->dev, "ib_post_send_mad error\n");143 goto err2;144 }145 return;146err2:147 ib_free_send_mad(send_buf);148err1:149 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);150}151 152static void agent_send_handler(struct ib_mad_agent *mad_agent,153 struct ib_mad_send_wc *mad_send_wc)154{155 rdma_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);156 ib_free_send_mad(mad_send_wc->send_buf);157}158 159int ib_agent_port_open(struct ib_device *device, int port_num)160{161 struct ib_agent_port_private *port_priv;162 unsigned long flags;163 int ret;164 165 /* Create new device info */166 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL);167 if (!port_priv) {168 ret = -ENOMEM;169 goto error1;170 }171 172 if (rdma_cap_ib_smi(device, port_num)) {173 /* Obtain send only MAD agent for SMI QP */174 port_priv->agent[0] = ib_register_mad_agent(device, port_num,175 IB_QPT_SMI, NULL, 0,176 &agent_send_handler,177 NULL, NULL, 0);178 if (IS_ERR(port_priv->agent[0])) {179 ret = PTR_ERR(port_priv->agent[0]);180 goto error2;181 }182 }183 184 if (rdma_cap_ib_cm(device, port_num)) {185 /* Obtain send only MAD agent for GSI QP */186 port_priv->agent[1] = ib_register_mad_agent(device, port_num,187 IB_QPT_GSI, NULL, 0,188 &agent_send_handler,189 NULL, NULL, 0);190 if (IS_ERR(port_priv->agent[1])) {191 ret = PTR_ERR(port_priv->agent[1]);192 goto error3;193 }194 }195 196 spin_lock_irqsave(&ib_agent_port_list_lock, flags);197 list_add_tail(&port_priv->port_list, &ib_agent_port_list);198 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);199 200 return 0;201 202error3:203 if (port_priv->agent[0])204 ib_unregister_mad_agent(port_priv->agent[0]);205error2:206 kfree(port_priv);207error1:208 return ret;209}210 211int ib_agent_port_close(struct ib_device *device, int port_num)212{213 struct ib_agent_port_private *port_priv;214 unsigned long flags;215 216 spin_lock_irqsave(&ib_agent_port_list_lock, flags);217 port_priv = __ib_get_agent_port(device, port_num);218 if (port_priv == NULL) {219 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);220 dev_err(&device->dev, "Port %d not found\n", port_num);221 return -ENODEV;222 }223 list_del(&port_priv->port_list);224 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags);225 226 if (port_priv->agent[1])227 ib_unregister_mad_agent(port_priv->agent[1]);228 if (port_priv->agent[0])229 ib_unregister_mad_agent(port_priv->agent[0]);230 231 kfree(port_priv);232 return 0;233}234