1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include <linux/string.h> 36 #include <linux/slab.h> 37 38 #include <rdma/ib_verbs.h> 39 #include <rdma/ib_mad.h> 40 #include <rdma/ib_smi.h> 41 42 #include "mthca_dev.h" 43 #include "mthca_cmd.h" 44 45 enum { 46 MTHCA_VENDOR_CLASS1 = 0x9, 47 MTHCA_VENDOR_CLASS2 = 0xa 48 }; 49 50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num) 51 { 52 struct ib_port_attr *tprops = NULL; 53 int ret; 54 55 tprops = kmalloc(sizeof *tprops, GFP_KERNEL); 56 if (!tprops) 57 return -ENOMEM; 58 59 ret = ib_query_port(&dev->ib_dev, port_num, tprops); 60 if (ret) { 61 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n", 62 ret, dev->ib_dev.name, port_num); 63 goto out; 64 } 65 66 dev->rate[port_num - 1] = tprops->active_speed * 67 ib_width_enum_to_int(tprops->active_width); 68 69 out: 70 kfree(tprops); 71 return ret; 72 } 73 74 static void update_sm_ah(struct mthca_dev *dev, 75 u8 port_num, u16 lid, u8 sl) 76 { 77 struct ib_ah *new_ah; 78 struct ib_ah_attr ah_attr; 79 unsigned long flags; 80 81 if (!dev->send_agent[port_num - 1][0]) 82 return; 83 84 memset(&ah_attr, 0, sizeof ah_attr); 85 ah_attr.dlid = lid; 86 ah_attr.sl = sl; 87 ah_attr.port_num = port_num; 88 89 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 90 &ah_attr); 91 if (IS_ERR(new_ah)) 92 return; 93 94 spin_lock_irqsave(&dev->sm_lock, flags); 95 if (dev->sm_ah[port_num - 1]) 96 ib_destroy_ah(dev->sm_ah[port_num - 1]); 97 dev->sm_ah[port_num - 1] = new_ah; 98 spin_unlock_irqrestore(&dev->sm_lock, flags); 99 } 100 101 /* 102 * Snoop SM MADs for port info and P_Key table sets, so we can 103 * synthesize LID change and P_Key change events. 104 */ 105 static void smp_snoop(struct ib_device *ibdev, 106 u8 port_num, 107 struct ib_mad *mad, 108 u16 prev_lid) 109 { 110 struct ib_event event; 111 112 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 113 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 114 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 115 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 116 struct ib_port_info *pinfo = 117 (struct ib_port_info *) ((struct ib_smp *) mad)->data; 118 u16 lid = be16_to_cpu(pinfo->lid); 119 120 mthca_update_rate(to_mdev(ibdev), port_num); 121 update_sm_ah(to_mdev(ibdev), port_num, 122 be16_to_cpu(pinfo->sm_lid), 123 pinfo->neighbormtu_mastersmsl & 0xf); 124 125 event.device = ibdev; 126 event.element.port_num = port_num; 127 128 if (pinfo->clientrereg_resv_subnetto & 0x80) { 129 event.event = IB_EVENT_CLIENT_REREGISTER; 130 ib_dispatch_event(&event); 131 } 132 133 if (prev_lid != lid) { 134 event.event = IB_EVENT_LID_CHANGE; 135 ib_dispatch_event(&event); 136 } 137 } 138 139 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 140 event.device = ibdev; 141 event.event = IB_EVENT_PKEY_CHANGE; 142 event.element.port_num = port_num; 143 ib_dispatch_event(&event); 144 } 145 } 146 } 147 148 static void node_desc_override(struct ib_device *dev, 149 struct ib_mad *mad) 150 { 151 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 152 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 153 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP && 154 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) { 155 mutex_lock(&to_mdev(dev)->cap_mask_mutex); 156 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64); 157 mutex_unlock(&to_mdev(dev)->cap_mask_mutex); 158 } 159 } 160 161 static void forward_trap(struct mthca_dev *dev, 162 u8 port_num, 163 struct ib_mad *mad) 164 { 165 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 166 struct ib_mad_send_buf *send_buf; 167 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 168 int ret; 169 unsigned long flags; 170 171 if (agent) { 172 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 173 IB_MGMT_MAD_DATA, GFP_ATOMIC); 174 if (IS_ERR(send_buf)) 175 return; 176 /* 177 * We rely here on the fact that MLX QPs don't use the 178 * address handle after the send is posted (this is 179 * wrong following the IB spec strictly, but we know 180 * it's OK for our devices). 181 */ 182 spin_lock_irqsave(&dev->sm_lock, flags); 183 memcpy(send_buf->mad, mad, sizeof *mad); 184 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 185 ret = ib_post_send_mad(send_buf, NULL); 186 else 187 ret = -EINVAL; 188 spin_unlock_irqrestore(&dev->sm_lock, flags); 189 190 if (ret) 191 ib_free_send_mad(send_buf); 192 } 193 } 194 195 int mthca_process_mad(struct ib_device *ibdev, 196 int mad_flags, 197 u8 port_num, 198 struct ib_wc *in_wc, 199 struct ib_grh *in_grh, 200 struct ib_mad *in_mad, 201 struct ib_mad *out_mad) 202 { 203 int err; 204 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 205 u16 prev_lid = 0; 206 struct ib_port_attr pattr; 207 208 /* Forward locally generated traps to the SM */ 209 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 210 slid == 0) { 211 forward_trap(to_mdev(ibdev), port_num, in_mad); 212 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 213 } 214 215 /* 216 * Only handle SM gets, sets and trap represses for SM class 217 * 218 * Only handle PMA and Mellanox vendor-specific class gets and 219 * sets for other classes. 220 */ 221 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 222 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 223 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 224 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 225 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 226 return IB_MAD_RESULT_SUCCESS; 227 228 /* 229 * Don't process SMInfo queries or vendor-specific 230 * MADs -- the SMA can't handle them. 231 */ 232 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 233 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 234 IB_SMP_ATTR_VENDOR_MASK)) 235 return IB_MAD_RESULT_SUCCESS; 236 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 237 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 238 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 239 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 240 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 241 return IB_MAD_RESULT_SUCCESS; 242 } else 243 return IB_MAD_RESULT_SUCCESS; 244 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 245 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 246 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 247 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 248 !ib_query_port(ibdev, port_num, &pattr)) 249 prev_lid = pattr.lid; 250 251 err = mthca_MAD_IFC(to_mdev(ibdev), 252 mad_flags & IB_MAD_IGNORE_MKEY, 253 mad_flags & IB_MAD_IGNORE_BKEY, 254 port_num, in_wc, in_grh, in_mad, out_mad); 255 if (err == -EBADMSG) 256 return IB_MAD_RESULT_SUCCESS; 257 else if (err) { 258 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err); 259 return IB_MAD_RESULT_FAILURE; 260 } 261 262 if (!out_mad->mad_hdr.status) { 263 smp_snoop(ibdev, port_num, in_mad, prev_lid); 264 node_desc_override(ibdev, out_mad); 265 } 266 267 /* set return bit in status of directed route responses */ 268 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 269 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 270 271 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 272 /* no response for trap repress */ 273 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 274 275 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 276 } 277 278 static void send_handler(struct ib_mad_agent *agent, 279 struct ib_mad_send_wc *mad_send_wc) 280 { 281 ib_free_send_mad(mad_send_wc->send_buf); 282 } 283 284 int mthca_create_agents(struct mthca_dev *dev) 285 { 286 struct ib_mad_agent *agent; 287 int p, q; 288 int ret; 289 290 spin_lock_init(&dev->sm_lock); 291 292 for (p = 0; p < dev->limits.num_ports; ++p) 293 for (q = 0; q <= 1; ++q) { 294 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 295 q ? IB_QPT_GSI : IB_QPT_SMI, 296 NULL, 0, send_handler, 297 NULL, NULL, 0); 298 if (IS_ERR(agent)) { 299 ret = PTR_ERR(agent); 300 goto err; 301 } 302 dev->send_agent[p][q] = agent; 303 } 304 305 306 for (p = 1; p <= dev->limits.num_ports; ++p) { 307 ret = mthca_update_rate(dev, p); 308 if (ret) { 309 mthca_err(dev, "Failed to obtain port %d rate." 310 " aborting.\n", p); 311 goto err; 312 } 313 } 314 315 return 0; 316 317 err: 318 for (p = 0; p < dev->limits.num_ports; ++p) 319 for (q = 0; q <= 1; ++q) 320 if (dev->send_agent[p][q]) 321 ib_unregister_mad_agent(dev->send_agent[p][q]); 322 323 return ret; 324 } 325 326 void mthca_free_agents(struct mthca_dev *dev) 327 { 328 struct ib_mad_agent *agent; 329 int p, q; 330 331 for (p = 0; p < dev->limits.num_ports; ++p) { 332 for (q = 0; q <= 1; ++q) { 333 agent = dev->send_agent[p][q]; 334 dev->send_agent[p][q] = NULL; 335 ib_unregister_mad_agent(agent); 336 } 337 338 if (dev->sm_ah[p]) 339 ib_destroy_ah(dev->sm_ah[p]); 340 } 341 } 342