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 const 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 const 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 IB_MGMT_BASE_VERSION); 175 if (IS_ERR(send_buf)) 176 return; 177 /* 178 * We rely here on the fact that MLX QPs don't use the 179 * address handle after the send is posted (this is 180 * wrong following the IB spec strictly, but we know 181 * it's OK for our devices). 182 */ 183 spin_lock_irqsave(&dev->sm_lock, flags); 184 memcpy(send_buf->mad, mad, sizeof *mad); 185 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 186 ret = ib_post_send_mad(send_buf, NULL); 187 else 188 ret = -EINVAL; 189 spin_unlock_irqrestore(&dev->sm_lock, flags); 190 191 if (ret) 192 ib_free_send_mad(send_buf); 193 } 194 } 195 196 int mthca_process_mad(struct ib_device *ibdev, 197 int mad_flags, 198 u8 port_num, 199 const struct ib_wc *in_wc, 200 const struct ib_grh *in_grh, 201 const struct ib_mad_hdr *in, size_t in_mad_size, 202 struct ib_mad_hdr *out, size_t *out_mad_size, 203 u16 *out_mad_pkey_index) 204 { 205 int err; 206 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 207 u16 prev_lid = 0; 208 struct ib_port_attr pattr; 209 const struct ib_mad *in_mad = (const struct ib_mad *)in; 210 struct ib_mad *out_mad = (struct ib_mad *)out; 211 212 BUG_ON(in_mad_size != sizeof(*in_mad) || 213 *out_mad_size != sizeof(*out_mad)); 214 215 /* Forward locally generated traps to the SM */ 216 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 217 slid == 0) { 218 forward_trap(to_mdev(ibdev), port_num, in_mad); 219 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 220 } 221 222 /* 223 * Only handle SM gets, sets and trap represses for SM class 224 * 225 * Only handle PMA and Mellanox vendor-specific class gets and 226 * sets for other classes. 227 */ 228 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 229 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 230 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 231 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 232 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 233 return IB_MAD_RESULT_SUCCESS; 234 235 /* 236 * Don't process SMInfo queries or vendor-specific 237 * MADs -- the SMA can't handle them. 238 */ 239 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 240 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 241 IB_SMP_ATTR_VENDOR_MASK)) 242 return IB_MAD_RESULT_SUCCESS; 243 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 244 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 245 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 246 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 247 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 248 return IB_MAD_RESULT_SUCCESS; 249 } else 250 return IB_MAD_RESULT_SUCCESS; 251 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 252 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 253 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 254 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 255 !ib_query_port(ibdev, port_num, &pattr)) 256 prev_lid = pattr.lid; 257 258 err = mthca_MAD_IFC(to_mdev(ibdev), 259 mad_flags & IB_MAD_IGNORE_MKEY, 260 mad_flags & IB_MAD_IGNORE_BKEY, 261 port_num, in_wc, in_grh, in_mad, out_mad); 262 if (err == -EBADMSG) 263 return IB_MAD_RESULT_SUCCESS; 264 else if (err) { 265 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err); 266 return IB_MAD_RESULT_FAILURE; 267 } 268 269 if (!out_mad->mad_hdr.status) { 270 smp_snoop(ibdev, port_num, in_mad, prev_lid); 271 node_desc_override(ibdev, out_mad); 272 } 273 274 /* set return bit in status of directed route responses */ 275 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 276 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 277 278 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 279 /* no response for trap repress */ 280 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 281 282 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 283 } 284 285 static void send_handler(struct ib_mad_agent *agent, 286 struct ib_mad_send_wc *mad_send_wc) 287 { 288 ib_free_send_mad(mad_send_wc->send_buf); 289 } 290 291 int mthca_create_agents(struct mthca_dev *dev) 292 { 293 struct ib_mad_agent *agent; 294 int p, q; 295 int ret; 296 297 spin_lock_init(&dev->sm_lock); 298 299 for (p = 0; p < dev->limits.num_ports; ++p) 300 for (q = 0; q <= 1; ++q) { 301 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 302 q ? IB_QPT_GSI : IB_QPT_SMI, 303 NULL, 0, send_handler, 304 NULL, NULL, 0); 305 if (IS_ERR(agent)) { 306 ret = PTR_ERR(agent); 307 goto err; 308 } 309 dev->send_agent[p][q] = agent; 310 } 311 312 313 for (p = 1; p <= dev->limits.num_ports; ++p) { 314 ret = mthca_update_rate(dev, p); 315 if (ret) { 316 mthca_err(dev, "Failed to obtain port %d rate." 317 " aborting.\n", p); 318 goto err; 319 } 320 } 321 322 return 0; 323 324 err: 325 for (p = 0; p < dev->limits.num_ports; ++p) 326 for (q = 0; q <= 1; ++q) 327 if (dev->send_agent[p][q]) 328 ib_unregister_mad_agent(dev->send_agent[p][q]); 329 330 return ret; 331 } 332 333 void mthca_free_agents(struct mthca_dev *dev) 334 { 335 struct ib_mad_agent *agent; 336 int p, q; 337 338 for (p = 0; p < dev->limits.num_ports; ++p) { 339 for (q = 0; q <= 1; ++q) { 340 agent = dev->send_agent[p][q]; 341 dev->send_agent[p][q] = NULL; 342 ib_unregister_mad_agent(agent); 343 } 344 345 if (dev->sm_ah[p]) 346 ib_destroy_ah(dev->sm_ah[p]); 347 } 348 } 349