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 } 216