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(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 port 63 * may only have one of them 64 */ 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 78 static struct ib_agent_port_private * 79 ib_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 90 void 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 else 103 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 %pe\n", ah); 114 return; 115 } 116 117 if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION) 118 resp_mad_len = IB_MGMT_MAD_SIZE; 119 120 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0, 121 IB_MGMT_MAD_HDR, 122 resp_mad_len - IB_MGMT_MAD_HDR, 123 GFP_KERNEL, 124 mad_hdr->base_version); 125 if (IS_ERR(send_buf)) { 126 dev_err(&device->dev, "ib_create_send_mad error\n"); 127 goto err1; 128 } 129 130 memcpy(send_buf->mad, mad_hdr, resp_mad_len); 131 send_buf->ah = ah; 132 133 if (rdma_cap_ib_switch(device)) { 134 mad_send_wr = container_of(send_buf, 135 struct ib_mad_send_wr_private, 136 send_buf); 137 mad_send_wr->send_wr.port_num = port_num; 138 } 139 140 if (ib_post_send_mad(send_buf, NULL)) { 141 dev_err(&device->dev, "ib_post_send_mad error\n"); 142 goto err2; 143 } 144 return; 145 err2: 146 ib_free_send_mad(send_buf); 147 err1: 148 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 149 } 150 151 static void agent_send_handler(struct ib_mad_agent *mad_agent, 152 struct ib_mad_send_wc *mad_send_wc) 153 { 154 rdma_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE); 155 ib_free_send_mad(mad_send_wc->send_buf); 156 } 157 158 int ib_agent_port_open(struct ib_device *device, int port_num) 159 { 160 struct ib_agent_port_private *port_priv; 161 unsigned long flags; 162 int ret; 163 164 /* Create new device info */ 165 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 166 if (!port_priv) { 167 ret = -ENOMEM; 168 goto error1; 169 } 170 171 if (rdma_cap_ib_smi(device, port_num)) { 172 /* Obtain send only MAD agent for SMI QP */ 173 port_priv->agent[0] = ib_register_mad_agent(device, port_num, 174 IB_QPT_SMI, NULL, 0, 175 &agent_send_handler, 176 NULL, NULL, 0); 177 if (IS_ERR(port_priv->agent[0])) { 178 ret = PTR_ERR(port_priv->agent[0]); 179 goto error2; 180 } 181 } 182 183 if (rdma_cap_ib_cm(device, port_num)) { 184 /* Obtain send only MAD agent for GSI QP */ 185 port_priv->agent[1] = ib_register_mad_agent(device, port_num, 186 IB_QPT_GSI, NULL, 0, 187 &agent_send_handler, 188 NULL, NULL, 0); 189 if (IS_ERR(port_priv->agent[1])) { 190 ret = PTR_ERR(port_priv->agent[1]); 191 goto error3; 192 } 193 } 194 195 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 196 list_add_tail(&port_priv->port_list, &ib_agent_port_list); 197 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 198 199 return 0; 200 201 error3: 202 if (port_priv->agent[0]) 203 ib_unregister_mad_agent(port_priv->agent[0]); 204 error2: 205 kfree(port_priv); 206 error1: 207 return ret; 208 } 209 210 int ib_agent_port_close(struct ib_device *device, int port_num) 211 { 212 struct ib_agent_port_private *port_priv; 213 unsigned long flags; 214 215 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 216 port_priv = __ib_get_agent_port(device, port_num); 217 if (port_priv == NULL) { 218 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 219 dev_err(&device->dev, "Port %d not found\n", port_num); 220 return -ENODEV; 221 } 222 list_del(&port_priv->port_list); 223 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 224 225 if (port_priv->agent[1]) 226 ib_unregister_mad_agent(port_priv->agent[1]); 227 if (port_priv->agent[0]) 228 ib_unregister_mad_agent(port_priv->agent[0]); 229 230 kfree(port_priv); 231 return 0; 232 } 233