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[1]->device == device && 63 entry->agent[1]->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 void 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 struct ib_mad_send_wr_private *mad_send_wr; 90 91 if (device->node_type == RDMA_NODE_IB_SWITCH) 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 printk(KERN_ERR SPFX "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 printk(KERN_ERR SPFX "ib_create_ah_from_wc error %ld\n", 105 PTR_ERR(ah)); 106 return; 107 } 108 109 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0, 110 IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 111 GFP_KERNEL); 112 if (IS_ERR(send_buf)) { 113 printk(KERN_ERR SPFX "ib_create_send_mad error\n"); 114 goto err1; 115 } 116 117 memcpy(send_buf->mad, mad, sizeof *mad); 118 send_buf->ah = ah; 119 120 if (device->node_type == RDMA_NODE_IB_SWITCH) { 121 mad_send_wr = container_of(send_buf, 122 struct ib_mad_send_wr_private, 123 send_buf); 124 mad_send_wr->send_wr.wr.ud.port_num = port_num; 125 } 126 127 if (ib_post_send_mad(send_buf, NULL)) { 128 printk(KERN_ERR SPFX "ib_post_send_mad error\n"); 129 goto err2; 130 } 131 return; 132 err2: 133 ib_free_send_mad(send_buf); 134 err1: 135 ib_destroy_ah(ah); 136 } 137 138 static void agent_send_handler(struct ib_mad_agent *mad_agent, 139 struct ib_mad_send_wc *mad_send_wc) 140 { 141 ib_destroy_ah(mad_send_wc->send_buf->ah); 142 ib_free_send_mad(mad_send_wc->send_buf); 143 } 144 145 int ib_agent_port_open(struct ib_device *device, int port_num) 146 { 147 struct ib_agent_port_private *port_priv; 148 unsigned long flags; 149 int ret; 150 151 /* Create new device info */ 152 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 153 if (!port_priv) { 154 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n"); 155 ret = -ENOMEM; 156 goto error1; 157 } 158 159 if (rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_INFINIBAND) { 160 /* Obtain send only MAD agent for SMI QP */ 161 port_priv->agent[0] = ib_register_mad_agent(device, port_num, 162 IB_QPT_SMI, NULL, 0, 163 &agent_send_handler, 164 NULL, NULL); 165 if (IS_ERR(port_priv->agent[0])) { 166 ret = PTR_ERR(port_priv->agent[0]); 167 goto error2; 168 } 169 } 170 171 /* Obtain send only MAD agent for GSI QP */ 172 port_priv->agent[1] = ib_register_mad_agent(device, port_num, 173 IB_QPT_GSI, NULL, 0, 174 &agent_send_handler, 175 NULL, NULL); 176 if (IS_ERR(port_priv->agent[1])) { 177 ret = PTR_ERR(port_priv->agent[1]); 178 goto error3; 179 } 180 181 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 182 list_add_tail(&port_priv->port_list, &ib_agent_port_list); 183 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 184 185 return 0; 186 187 error3: 188 if (port_priv->agent[0]) 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 if (port_priv->agent[0]) 213 ib_unregister_mad_agent(port_priv->agent[0]); 214 215 kfree(port_priv); 216 return 0; 217 } 218