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 dev_warn(&dev->ib_dev.dev, 62 "ib_query_port failed (%d) forport %d\n", ret, 63 port_num); 64 goto out; 65 } 66 67 dev->rate[port_num - 1] = tprops->active_speed * 68 ib_width_enum_to_int(tprops->active_width); 69 70 out: 71 kfree(tprops); 72 return ret; 73 } 74 75 static void update_sm_ah(struct mthca_dev *dev, 76 u8 port_num, u16 lid, u8 sl) 77 { 78 struct ib_ah *new_ah; 79 struct rdma_ah_attr ah_attr; 80 unsigned long flags; 81 82 if (!dev->send_agent[port_num - 1][0]) 83 return; 84 85 memset(&ah_attr, 0, sizeof ah_attr); 86 ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num); 87 rdma_ah_set_dlid(&ah_attr, lid); 88 rdma_ah_set_sl(&ah_attr, sl); 89 rdma_ah_set_port_num(&ah_attr, port_num); 90 91 new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 92 &ah_attr, 0); 93 if (IS_ERR(new_ah)) 94 return; 95 96 spin_lock_irqsave(&dev->sm_lock, flags); 97 if (dev->sm_ah[port_num - 1]) 98 rdma_destroy_ah(dev->sm_ah[port_num - 1], 0); 99 dev->sm_ah[port_num - 1] = new_ah; 100 spin_unlock_irqrestore(&dev->sm_lock, flags); 101 } 102 103 /* 104 * Snoop SM MADs for port info and P_Key table sets, so we can 105 * synthesize LID change and P_Key change events. 106 */ 107 static void smp_snoop(struct ib_device *ibdev, 108 u8 port_num, 109 const struct ib_mad *mad, 110 u16 prev_lid) 111 { 112 struct ib_event event; 113 114 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 115 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 116 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 117 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 118 struct ib_port_info *pinfo = 119 (struct ib_port_info *) ((struct ib_smp *) mad)->data; 120 u16 lid = be16_to_cpu(pinfo->lid); 121 122 mthca_update_rate(to_mdev(ibdev), port_num); 123 update_sm_ah(to_mdev(ibdev), port_num, 124 be16_to_cpu(pinfo->sm_lid), 125 pinfo->neighbormtu_mastersmsl & 0xf); 126 127 event.device = ibdev; 128 event.element.port_num = port_num; 129 130 if (pinfo->clientrereg_resv_subnetto & 0x80) { 131 event.event = IB_EVENT_CLIENT_REREGISTER; 132 ib_dispatch_event(&event); 133 } 134 135 if (prev_lid != lid) { 136 event.event = IB_EVENT_LID_CHANGE; 137 ib_dispatch_event(&event); 138 } 139 } 140 141 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 142 event.device = ibdev; 143 event.event = IB_EVENT_PKEY_CHANGE; 144 event.element.port_num = port_num; 145 ib_dispatch_event(&event); 146 } 147 } 148 } 149 150 static void node_desc_override(struct ib_device *dev, 151 struct ib_mad *mad) 152 { 153 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 154 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 155 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP && 156 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) { 157 mutex_lock(&to_mdev(dev)->cap_mask_mutex); 158 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 159 IB_DEVICE_NODE_DESC_MAX); 160 mutex_unlock(&to_mdev(dev)->cap_mask_mutex); 161 } 162 } 163 164 static void forward_trap(struct mthca_dev *dev, 165 u8 port_num, 166 const struct ib_mad *mad) 167 { 168 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 169 struct ib_mad_send_buf *send_buf; 170 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 171 int ret; 172 unsigned long flags; 173 174 if (agent) { 175 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 176 IB_MGMT_MAD_DATA, GFP_ATOMIC, 177 IB_MGMT_BASE_VERSION); 178 if (IS_ERR(send_buf)) 179 return; 180 /* 181 * We rely here on the fact that MLX QPs don't use the 182 * address handle after the send is posted (this is 183 * wrong following the IB spec strictly, but we know 184 * it's OK for our devices). 185 */ 186 spin_lock_irqsave(&dev->sm_lock, flags); 187 memcpy(send_buf->mad, mad, sizeof *mad); 188 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 189 ret = ib_post_send_mad(send_buf, NULL); 190 else 191 ret = -EINVAL; 192 spin_unlock_irqrestore(&dev->sm_lock, flags); 193 194 if (ret) 195 ib_free_send_mad(send_buf); 196 } 197 } 198 199 int mthca_process_mad(struct ib_device *ibdev, 200 int mad_flags, 201 u8 port_num, 202 const struct ib_wc *in_wc, 203 const struct ib_grh *in_grh, 204 const struct ib_mad_hdr *in, size_t in_mad_size, 205 struct ib_mad_hdr *out, size_t *out_mad_size, 206 u16 *out_mad_pkey_index) 207 { 208 int err; 209 u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE); 210 u16 prev_lid = 0; 211 struct ib_port_attr pattr; 212 const struct ib_mad *in_mad = (const struct ib_mad *)in; 213 struct ib_mad *out_mad = (struct ib_mad *)out; 214 215 if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) || 216 *out_mad_size != sizeof(*out_mad))) 217 return IB_MAD_RESULT_FAILURE; 218 219 /* Forward locally generated traps to the SM */ 220 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 221 slid == 0) { 222 forward_trap(to_mdev(ibdev), port_num, in_mad); 223 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 224 } 225 226 /* 227 * Only handle SM gets, sets and trap represses for SM class 228 * 229 * Only handle PMA and Mellanox vendor-specific class gets and 230 * sets for other classes. 231 */ 232 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 233 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 234 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 235 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 236 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 237 return IB_MAD_RESULT_SUCCESS; 238 239 /* 240 * Don't process SMInfo queries or vendor-specific 241 * MADs -- the SMA can't handle them. 242 */ 243 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 244 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 245 IB_SMP_ATTR_VENDOR_MASK)) 246 return IB_MAD_RESULT_SUCCESS; 247 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 248 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 249 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 250 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 251 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 252 return IB_MAD_RESULT_SUCCESS; 253 } else 254 return IB_MAD_RESULT_SUCCESS; 255 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 256 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 257 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 258 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 259 !ib_query_port(ibdev, port_num, &pattr)) 260 prev_lid = ib_lid_cpu16(pattr.lid); 261 262 err = mthca_MAD_IFC(to_mdev(ibdev), 263 mad_flags & IB_MAD_IGNORE_MKEY, 264 mad_flags & IB_MAD_IGNORE_BKEY, 265 port_num, in_wc, in_grh, in_mad, out_mad); 266 if (err == -EBADMSG) 267 return IB_MAD_RESULT_SUCCESS; 268 else if (err) { 269 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err); 270 return IB_MAD_RESULT_FAILURE; 271 } 272 273 if (!out_mad->mad_hdr.status) { 274 smp_snoop(ibdev, port_num, in_mad, prev_lid); 275 node_desc_override(ibdev, out_mad); 276 } 277 278 /* set return bit in status of directed route responses */ 279 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 280 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 281 282 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 283 /* no response for trap repress */ 284 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 285 286 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 287 } 288 289 static void send_handler(struct ib_mad_agent *agent, 290 struct ib_mad_send_wc *mad_send_wc) 291 { 292 ib_free_send_mad(mad_send_wc->send_buf); 293 } 294 295 int mthca_create_agents(struct mthca_dev *dev) 296 { 297 struct ib_mad_agent *agent; 298 int p, q; 299 int ret; 300 301 spin_lock_init(&dev->sm_lock); 302 303 for (p = 0; p < dev->limits.num_ports; ++p) 304 for (q = 0; q <= 1; ++q) { 305 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 306 q ? IB_QPT_GSI : IB_QPT_SMI, 307 NULL, 0, send_handler, 308 NULL, NULL, 0); 309 if (IS_ERR(agent)) { 310 ret = PTR_ERR(agent); 311 goto err; 312 } 313 dev->send_agent[p][q] = agent; 314 } 315 316 317 for (p = 1; p <= dev->limits.num_ports; ++p) { 318 ret = mthca_update_rate(dev, p); 319 if (ret) { 320 mthca_err(dev, "Failed to obtain port %d rate." 321 " aborting.\n", p); 322 goto err; 323 } 324 } 325 326 return 0; 327 328 err: 329 for (p = 0; p < dev->limits.num_ports; ++p) 330 for (q = 0; q <= 1; ++q) 331 if (dev->send_agent[p][q]) 332 ib_unregister_mad_agent(dev->send_agent[p][q]); 333 334 return ret; 335 } 336 337 void mthca_free_agents(struct mthca_dev *dev) 338 { 339 struct ib_mad_agent *agent; 340 int p, q; 341 342 for (p = 0; p < dev->limits.num_ports; ++p) { 343 for (q = 0; q <= 1; ++q) { 344 agent = dev->send_agent[p][q]; 345 dev->send_agent[p][q] = NULL; 346 ib_unregister_mad_agent(agent); 347 } 348 349 if (dev->sm_ah[p]) 350 rdma_destroy_ah(dev->sm_ah[p], 351 RDMA_DESTROY_AH_SLEEPABLE); 352 } 353 } 354