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 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\n"); 105 return; 106 } 107 108 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0, 109 IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 110 GFP_KERNEL); 111 if (IS_ERR(send_buf)) { 112 printk(KERN_ERR SPFX "ib_create_send_mad error\n"); 113 goto err1; 114 } 115 116 memcpy(send_buf->mad, mad, sizeof *mad); 117 send_buf->ah = ah; 118 119 if (device->node_type == RDMA_NODE_IB_SWITCH) { 120 mad_send_wr = container_of(send_buf, 121 struct ib_mad_send_wr_private, 122 send_buf); 123 mad_send_wr->send_wr.wr.ud.port_num = port_num; 124 } 125 126 if (ib_post_send_mad(send_buf, NULL)) { 127 printk(KERN_ERR SPFX "ib_post_send_mad error\n"); 128 goto err2; 129 } 130 return; 131 err2: 132 ib_free_send_mad(send_buf); 133 err1: 134 ib_destroy_ah(ah); 135 } 136 137 static void agent_send_handler(struct ib_mad_agent *mad_agent, 138 struct ib_mad_send_wc *mad_send_wc) 139 { 140 ib_destroy_ah(mad_send_wc->send_buf->ah); 141 ib_free_send_mad(mad_send_wc->send_buf); 142 } 143 144 int ib_agent_port_open(struct ib_device *device, int port_num) 145 { 146 struct ib_agent_port_private *port_priv; 147 unsigned long flags; 148 int ret; 149 150 /* Create new device info */ 151 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 152 if (!port_priv) { 153 printk(KERN_ERR SPFX "No memory for ib_agent_port_private\n"); 154 ret = -ENOMEM; 155 goto error1; 156 } 157 158 /* Obtain send only MAD agent for SMI QP */ 159 port_priv->agent[0] = ib_register_mad_agent(device, port_num, 160 IB_QPT_SMI, NULL, 0, 161 &agent_send_handler, 162 NULL, NULL); 163 if (IS_ERR(port_priv->agent[0])) { 164 ret = PTR_ERR(port_priv->agent[0]); 165 goto error2; 166 } 167 168 /* Obtain send only MAD agent for GSI QP */ 169 port_priv->agent[1] = ib_register_mad_agent(device, port_num, 170 IB_QPT_GSI, NULL, 0, 171 &agent_send_handler, 172 NULL, NULL); 173 if (IS_ERR(port_priv->agent[1])) { 174 ret = PTR_ERR(port_priv->agent[1]); 175 goto error3; 176 } 177 178 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 179 list_add_tail(&port_priv->port_list, &ib_agent_port_list); 180 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 181 182 return 0; 183 184 error3: 185 ib_unregister_mad_agent(port_priv->agent[0]); 186 error2: 187 kfree(port_priv); 188 error1: 189 return ret; 190 } 191 192 int ib_agent_port_close(struct ib_device *device, int port_num) 193 { 194 struct ib_agent_port_private *port_priv; 195 unsigned long flags; 196 197 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 198 port_priv = __ib_get_agent_port(device, port_num); 199 if (port_priv == NULL) { 200 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 201 printk(KERN_ERR SPFX "Port %d not found\n", port_num); 202 return -ENODEV; 203 } 204 list_del(&port_priv->port_list); 205 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 206 207 ib_unregister_mad_agent(port_priv->agent[1]); 208 ib_unregister_mad_agent(port_priv->agent[0]); 209 kfree(port_priv); 210 return 0; 211 } 212