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 rdma_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.type = rdma_ah_find_type(&dev->ib_dev, port_num); 86 rdma_ah_set_dlid(&ah_attr, lid); 87 rdma_ah_set_sl(&ah_attr, sl); 88 rdma_ah_set_port_num(&ah_attr, port_num); 89 90 new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 91 &ah_attr); 92 if (IS_ERR(new_ah)) 93 return; 94 95 spin_lock_irqsave(&dev->sm_lock, flags); 96 if (dev->sm_ah[port_num - 1]) 97 rdma_destroy_ah(dev->sm_ah[port_num - 1]); 98 dev->sm_ah[port_num - 1] = new_ah; 99 spin_unlock_irqrestore(&dev->sm_lock, flags); 100 } 101 102 /* 103 * Snoop SM MADs for port info and P_Key table sets, so we can 104 * synthesize LID change and P_Key change events. 105 */ 106 static void smp_snoop(struct ib_device *ibdev, 107 u8 port_num, 108 const struct ib_mad *mad, 109 u16 prev_lid) 110 { 111 struct ib_event event; 112 113 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 114 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 115 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 116 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 117 struct ib_port_info *pinfo = 118 (struct ib_port_info *) ((struct ib_smp *) mad)->data; 119 u16 lid = be16_to_cpu(pinfo->lid); 120 121 mthca_update_rate(to_mdev(ibdev), port_num); 122 update_sm_ah(to_mdev(ibdev), port_num, 123 be16_to_cpu(pinfo->sm_lid), 124 pinfo->neighbormtu_mastersmsl & 0xf); 125 126 event.device = ibdev; 127 event.element.port_num = port_num; 128 129 if (pinfo->clientrereg_resv_subnetto & 0x80) { 130 event.event = IB_EVENT_CLIENT_REREGISTER; 131 ib_dispatch_event(&event); 132 } 133 134 if (prev_lid != lid) { 135 event.event = IB_EVENT_LID_CHANGE; 136 ib_dispatch_event(&event); 137 } 138 } 139 140 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 141 event.device = ibdev; 142 event.event = IB_EVENT_PKEY_CHANGE; 143 event.element.port_num = port_num; 144 ib_dispatch_event(&event); 145 } 146 } 147 } 148 149 static void node_desc_override(struct ib_device *dev, 150 struct ib_mad *mad) 151 { 152 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 153 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 154 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP && 155 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) { 156 mutex_lock(&to_mdev(dev)->cap_mask_mutex); 157 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 158 IB_DEVICE_NODE_DESC_MAX); 159 mutex_unlock(&to_mdev(dev)->cap_mask_mutex); 160 } 161 } 162 163 static void forward_trap(struct mthca_dev *dev, 164 u8 port_num, 165 const struct ib_mad *mad) 166 { 167 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 168 struct ib_mad_send_buf *send_buf; 169 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 170 int ret; 171 unsigned long flags; 172 173 if (agent) { 174 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 175 IB_MGMT_MAD_DATA, GFP_ATOMIC, 176 IB_MGMT_BASE_VERSION); 177 if (IS_ERR(send_buf)) 178 return; 179 /* 180 * We rely here on the fact that MLX QPs don't use the 181 * address handle after the send is posted (this is 182 * wrong following the IB spec strictly, but we know 183 * it's OK for our devices). 184 */ 185 spin_lock_irqsave(&dev->sm_lock, flags); 186 memcpy(send_buf->mad, mad, sizeof *mad); 187 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 188 ret = ib_post_send_mad(send_buf, NULL); 189 else 190 ret = -EINVAL; 191 spin_unlock_irqrestore(&dev->sm_lock, flags); 192 193 if (ret) 194 ib_free_send_mad(send_buf); 195 } 196 } 197 198 int mthca_process_mad(struct ib_device *ibdev, 199 int mad_flags, 200 u8 port_num, 201 const struct ib_wc *in_wc, 202 const struct ib_grh *in_grh, 203 const struct ib_mad_hdr *in, size_t in_mad_size, 204 struct ib_mad_hdr *out, size_t *out_mad_size, 205 u16 *out_mad_pkey_index) 206 { 207 int err; 208 u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE); 209 u16 prev_lid = 0; 210 struct ib_port_attr pattr; 211 const struct ib_mad *in_mad = (const struct ib_mad *)in; 212 struct ib_mad *out_mad = (struct ib_mad *)out; 213 214 if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) || 215 *out_mad_size != sizeof(*out_mad))) 216 return IB_MAD_RESULT_FAILURE; 217 218 /* Forward locally generated traps to the SM */ 219 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 220 slid == 0) { 221 forward_trap(to_mdev(ibdev), port_num, in_mad); 222 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 223 } 224 225 /* 226 * Only handle SM gets, sets and trap represses for SM class 227 * 228 * Only handle PMA and Mellanox vendor-specific class gets and 229 * sets for other classes. 230 */ 231 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 232 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 233 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 234 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 235 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 236 return IB_MAD_RESULT_SUCCESS; 237 238 /* 239 * Don't process SMInfo queries or vendor-specific 240 * MADs -- the SMA can't handle them. 241 */ 242 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 243 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 244 IB_SMP_ATTR_VENDOR_MASK)) 245 return IB_MAD_RESULT_SUCCESS; 246 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 247 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 248 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 249 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 250 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 251 return IB_MAD_RESULT_SUCCESS; 252 } else 253 return IB_MAD_RESULT_SUCCESS; 254 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 255 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 256 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 257 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 258 !ib_query_port(ibdev, port_num, &pattr)) 259 prev_lid = ib_lid_cpu16(pattr.lid); 260 261 err = mthca_MAD_IFC(to_mdev(ibdev), 262 mad_flags & IB_MAD_IGNORE_MKEY, 263 mad_flags & IB_MAD_IGNORE_BKEY, 264 port_num, in_wc, in_grh, in_mad, out_mad); 265 if (err == -EBADMSG) 266 return IB_MAD_RESULT_SUCCESS; 267 else if (err) { 268 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err); 269 return IB_MAD_RESULT_FAILURE; 270 } 271 272 if (!out_mad->mad_hdr.status) { 273 smp_snoop(ibdev, port_num, in_mad, prev_lid); 274 node_desc_override(ibdev, out_mad); 275 } 276 277 /* set return bit in status of directed route responses */ 278 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 279 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 280 281 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 282 /* no response for trap repress */ 283 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 284 285 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 286 } 287 288 static void send_handler(struct ib_mad_agent *agent, 289 struct ib_mad_send_wc *mad_send_wc) 290 { 291 ib_free_send_mad(mad_send_wc->send_buf); 292 } 293 294 int mthca_create_agents(struct mthca_dev *dev) 295 { 296 struct ib_mad_agent *agent; 297 int p, q; 298 int ret; 299 300 spin_lock_init(&dev->sm_lock); 301 302 for (p = 0; p < dev->limits.num_ports; ++p) 303 for (q = 0; q <= 1; ++q) { 304 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 305 q ? IB_QPT_GSI : IB_QPT_SMI, 306 NULL, 0, send_handler, 307 NULL, NULL, 0); 308 if (IS_ERR(agent)) { 309 ret = PTR_ERR(agent); 310 goto err; 311 } 312 dev->send_agent[p][q] = agent; 313 } 314 315 316 for (p = 1; p <= dev->limits.num_ports; ++p) { 317 ret = mthca_update_rate(dev, p); 318 if (ret) { 319 mthca_err(dev, "Failed to obtain port %d rate." 320 " aborting.\n", p); 321 goto err; 322 } 323 } 324 325 return 0; 326 327 err: 328 for (p = 0; p < dev->limits.num_ports; ++p) 329 for (q = 0; q <= 1; ++q) 330 if (dev->send_agent[p][q]) 331 ib_unregister_mad_agent(dev->send_agent[p][q]); 332 333 return ret; 334 } 335 336 void mthca_free_agents(struct mthca_dev *dev) 337 { 338 struct ib_mad_agent *agent; 339 int p, q; 340 341 for (p = 0; p < dev->limits.num_ports; ++p) { 342 for (q = 0; q <= 1; ++q) { 343 agent = dev->send_agent[p][q]; 344 dev->send_agent[p][q] = NULL; 345 ib_unregister_mad_agent(agent); 346 } 347 348 if (dev->sm_ah[p]) 349 rdma_destroy_ah(dev->sm_ah[p]); 350 } 351 } 352