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, 0); 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], 0); 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, 157 IB_DEVICE_NODE_DESC_MAX); 158 mutex_unlock(&to_mdev(dev)->cap_mask_mutex); 159 } 160 } 161 162 static void forward_trap(struct mthca_dev *dev, 163 u8 port_num, 164 const struct ib_mad *mad) 165 { 166 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 167 struct ib_mad_send_buf *send_buf; 168 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 169 int ret; 170 unsigned long flags; 171 172 if (agent) { 173 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 174 IB_MGMT_MAD_DATA, GFP_ATOMIC, 175 IB_MGMT_BASE_VERSION); 176 if (IS_ERR(send_buf)) 177 return; 178 /* 179 * We rely here on the fact that MLX QPs don't use the 180 * address handle after the send is posted (this is 181 * wrong following the IB spec strictly, but we know 182 * it's OK for our devices). 183 */ 184 spin_lock_irqsave(&dev->sm_lock, flags); 185 memcpy(send_buf->mad, mad, sizeof *mad); 186 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 187 ret = ib_post_send_mad(send_buf, NULL); 188 else 189 ret = -EINVAL; 190 spin_unlock_irqrestore(&dev->sm_lock, flags); 191 192 if (ret) 193 ib_free_send_mad(send_buf); 194 } 195 } 196 197 int mthca_process_mad(struct ib_device *ibdev, 198 int mad_flags, 199 u8 port_num, 200 const struct ib_wc *in_wc, 201 const struct ib_grh *in_grh, 202 const struct ib_mad_hdr *in, size_t in_mad_size, 203 struct ib_mad_hdr *out, size_t *out_mad_size, 204 u16 *out_mad_pkey_index) 205 { 206 int err; 207 u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 208 u16 prev_lid = 0; 209 struct ib_port_attr pattr; 210 const struct ib_mad *in_mad = (const struct ib_mad *)in; 211 struct ib_mad *out_mad = (struct ib_mad *)out; 212 213 if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) || 214 *out_mad_size != sizeof(*out_mad))) 215 return IB_MAD_RESULT_FAILURE; 216 217 /* Forward locally generated traps to the SM */ 218 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && 219 slid == 0) { 220 forward_trap(to_mdev(ibdev), port_num, in_mad); 221 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 222 } 223 224 /* 225 * Only handle SM gets, sets and trap represses for SM class 226 * 227 * Only handle PMA and Mellanox vendor-specific class gets and 228 * sets for other classes. 229 */ 230 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 231 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 232 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 233 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 234 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 235 return IB_MAD_RESULT_SUCCESS; 236 237 /* 238 * Don't process SMInfo queries or vendor-specific 239 * MADs -- the SMA can't handle them. 240 */ 241 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 242 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 243 IB_SMP_ATTR_VENDOR_MASK)) 244 return IB_MAD_RESULT_SUCCESS; 245 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 246 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 || 247 in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) { 248 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 249 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 250 return IB_MAD_RESULT_SUCCESS; 251 } else 252 return IB_MAD_RESULT_SUCCESS; 253 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 254 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 255 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 256 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 257 !ib_query_port(ibdev, port_num, &pattr)) 258 prev_lid = pattr.lid; 259 260 err = mthca_MAD_IFC(to_mdev(ibdev), 261 mad_flags & IB_MAD_IGNORE_MKEY, 262 mad_flags & IB_MAD_IGNORE_BKEY, 263 port_num, in_wc, in_grh, in_mad, out_mad); 264 if (err == -EBADMSG) 265 return IB_MAD_RESULT_SUCCESS; 266 else if (err) { 267 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err); 268 return IB_MAD_RESULT_FAILURE; 269 } 270 271 if (!out_mad->mad_hdr.status) { 272 smp_snoop(ibdev, port_num, in_mad, prev_lid); 273 node_desc_override(ibdev, out_mad); 274 } 275 276 /* set return bit in status of directed route responses */ 277 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 278 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 279 280 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 281 /* no response for trap repress */ 282 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 283 284 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 285 } 286 287 static void send_handler(struct ib_mad_agent *agent, 288 struct ib_mad_send_wc *mad_send_wc) 289 { 290 ib_free_send_mad(mad_send_wc->send_buf); 291 } 292 293 int mthca_create_agents(struct mthca_dev *dev) 294 { 295 struct ib_mad_agent *agent; 296 int p, q; 297 int ret; 298 299 spin_lock_init(&dev->sm_lock); 300 301 for (p = 0; p < dev->limits.num_ports; ++p) 302 for (q = 0; q <= 1; ++q) { 303 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 304 q ? IB_QPT_GSI : IB_QPT_SMI, 305 NULL, 0, send_handler, 306 NULL, NULL, 0); 307 if (IS_ERR(agent)) { 308 ret = PTR_ERR(agent); 309 goto err; 310 } 311 dev->send_agent[p][q] = agent; 312 } 313 314 for (p = 1; p <= dev->limits.num_ports; ++p) { 315 ret = mthca_update_rate(dev, p); 316 if (ret) { 317 mthca_err(dev, "Failed to obtain port %d rate." 318 " aborting.\n", p); 319 goto err; 320 } 321 } 322 323 return 0; 324 325 err: 326 for (p = 0; p < dev->limits.num_ports; ++p) 327 for (q = 0; q <= 1; ++q) 328 if (dev->send_agent[p][q]) 329 ib_unregister_mad_agent(dev->send_agent[p][q]); 330 331 return ret; 332 } 333 334 void mthca_free_agents(struct mthca_dev *dev) 335 { 336 struct ib_mad_agent *agent; 337 int p, q; 338 339 for (p = 0; p < dev->limits.num_ports; ++p) { 340 for (q = 0; q <= 1; ++q) { 341 agent = dev->send_agent[p][q]; 342 dev->send_agent[p][q] = NULL; 343 ib_unregister_mad_agent(agent); 344 } 345 346 if (dev->sm_ah[p]) 347 ib_destroy_ah(dev->sm_ah[p], 348 RDMA_DESTROY_AH_SLEEPABLE); 349 } 350 } 351