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 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(const 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(const struct ib_mad_hdr *mad_hdr, const struct ib_grh *grh, 82 const struct ib_wc *wc, const struct ib_device *device, 83 int port_num, int qpn, size_t resp_mad_len, bool opa) 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 (rdma_cap_ib_switch(device)) 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 dev_err(&device->dev, "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 dev_err(&device->dev, "ib_create_ah_from_wc error %ld\n", 105 PTR_ERR(ah)); 106 return; 107 } 108 109 if (opa && mad_hdr->base_version != OPA_MGMT_BASE_VERSION) 110 resp_mad_len = IB_MGMT_MAD_SIZE; 111 112 send_buf = ib_create_send_mad(agent, wc->src_qp, wc->pkey_index, 0, 113 IB_MGMT_MAD_HDR, 114 resp_mad_len - IB_MGMT_MAD_HDR, 115 GFP_KERNEL, 116 mad_hdr->base_version); 117 if (IS_ERR(send_buf)) { 118 dev_err(&device->dev, "ib_create_send_mad error\n"); 119 goto err1; 120 } 121 122 memcpy(send_buf->mad, mad_hdr, resp_mad_len); 123 send_buf->ah = ah; 124 125 if (rdma_cap_ib_switch(device)) { 126 mad_send_wr = container_of(send_buf, 127 struct ib_mad_send_wr_private, 128 send_buf); 129 mad_send_wr->send_wr.port_num = port_num; 130 } 131 132 if (ib_post_send_mad(send_buf, NULL)) { 133 dev_err(&device->dev, "ib_post_send_mad error\n"); 134 goto err2; 135 } 136 return; 137 err2: 138 ib_free_send_mad(send_buf); 139 err1: 140 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 141 } 142 143 static void agent_send_handler(struct ib_mad_agent *mad_agent, 144 struct ib_mad_send_wc *mad_send_wc) 145 { 146 rdma_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE); 147 ib_free_send_mad(mad_send_wc->send_buf); 148 } 149 150 int ib_agent_port_open(struct ib_device *device, int port_num) 151 { 152 struct ib_agent_port_private *port_priv; 153 unsigned long flags; 154 int ret; 155 156 /* Create new device info */ 157 port_priv = kzalloc(sizeof *port_priv, GFP_KERNEL); 158 if (!port_priv) { 159 ret = -ENOMEM; 160 goto error1; 161 } 162 163 if (rdma_cap_ib_smi(device, port_num)) { 164 /* Obtain send only MAD agent for SMI QP */ 165 port_priv->agent[0] = ib_register_mad_agent(device, port_num, 166 IB_QPT_SMI, NULL, 0, 167 &agent_send_handler, 168 NULL, NULL, 0); 169 if (IS_ERR(port_priv->agent[0])) { 170 ret = PTR_ERR(port_priv->agent[0]); 171 goto error2; 172 } 173 } 174 175 /* Obtain send only MAD agent for GSI QP */ 176 port_priv->agent[1] = ib_register_mad_agent(device, port_num, 177 IB_QPT_GSI, NULL, 0, 178 &agent_send_handler, 179 NULL, NULL, 0); 180 if (IS_ERR(port_priv->agent[1])) { 181 ret = PTR_ERR(port_priv->agent[1]); 182 goto error3; 183 } 184 185 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 186 list_add_tail(&port_priv->port_list, &ib_agent_port_list); 187 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 188 189 return 0; 190 191 error3: 192 if (port_priv->agent[0]) 193 ib_unregister_mad_agent(port_priv->agent[0]); 194 error2: 195 kfree(port_priv); 196 error1: 197 return ret; 198 } 199 200 int ib_agent_port_close(struct ib_device *device, int port_num) 201 { 202 struct ib_agent_port_private *port_priv; 203 unsigned long flags; 204 205 spin_lock_irqsave(&ib_agent_port_list_lock, flags); 206 port_priv = __ib_get_agent_port(device, port_num); 207 if (port_priv == NULL) { 208 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 209 dev_err(&device->dev, "Port %d not found\n", port_num); 210 return -ENODEV; 211 } 212 list_del(&port_priv->port_list); 213 spin_unlock_irqrestore(&ib_agent_port_list_lock, flags); 214 215 ib_unregister_mad_agent(port_priv->agent[1]); 216 if (port_priv->agent[0]) 217 ib_unregister_mad_agent(port_priv->agent[0]); 218 219 kfree(port_priv); 220 return 0; 221 } 222