1 /* 2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <rdma/ib_mad.h> 34 #include <rdma/ib_smi.h> 35 36 #include <linux/mlx4/cmd.h> 37 #include <linux/gfp.h> 38 39 #include "mlx4_ib.h" 40 41 enum { 42 MLX4_IB_VENDOR_CLASS1 = 0x9, 43 MLX4_IB_VENDOR_CLASS2 = 0xa 44 }; 45 46 int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey, 47 int port, struct ib_wc *in_wc, struct ib_grh *in_grh, 48 void *in_mad, void *response_mad) 49 { 50 struct mlx4_cmd_mailbox *inmailbox, *outmailbox; 51 void *inbox; 52 int err; 53 u32 in_modifier = port; 54 u8 op_modifier = 0; 55 56 inmailbox = mlx4_alloc_cmd_mailbox(dev->dev); 57 if (IS_ERR(inmailbox)) 58 return PTR_ERR(inmailbox); 59 inbox = inmailbox->buf; 60 61 outmailbox = mlx4_alloc_cmd_mailbox(dev->dev); 62 if (IS_ERR(outmailbox)) { 63 mlx4_free_cmd_mailbox(dev->dev, inmailbox); 64 return PTR_ERR(outmailbox); 65 } 66 67 memcpy(inbox, in_mad, 256); 68 69 /* 70 * Key check traps can't be generated unless we have in_wc to 71 * tell us where to send the trap. 72 */ 73 if (ignore_mkey || !in_wc) 74 op_modifier |= 0x1; 75 if (ignore_bkey || !in_wc) 76 op_modifier |= 0x2; 77 78 if (in_wc) { 79 struct { 80 __be32 my_qpn; 81 u32 reserved1; 82 __be32 rqpn; 83 u8 sl; 84 u8 g_path; 85 u16 reserved2[2]; 86 __be16 pkey; 87 u32 reserved3[11]; 88 u8 grh[40]; 89 } *ext_info; 90 91 memset(inbox + 256, 0, 256); 92 ext_info = inbox + 256; 93 94 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num); 95 ext_info->rqpn = cpu_to_be32(in_wc->src_qp); 96 ext_info->sl = in_wc->sl << 4; 97 ext_info->g_path = in_wc->dlid_path_bits | 98 (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0); 99 ext_info->pkey = cpu_to_be16(in_wc->pkey_index); 100 101 if (in_grh) 102 memcpy(ext_info->grh, in_grh, 40); 103 104 op_modifier |= 0x4; 105 106 in_modifier |= in_wc->slid << 16; 107 } 108 109 err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma, 110 in_modifier, op_modifier, 111 MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C); 112 113 if (!err) 114 memcpy(response_mad, outmailbox->buf, 256); 115 116 mlx4_free_cmd_mailbox(dev->dev, inmailbox); 117 mlx4_free_cmd_mailbox(dev->dev, outmailbox); 118 119 return err; 120 } 121 122 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl) 123 { 124 struct ib_ah *new_ah; 125 struct ib_ah_attr ah_attr; 126 127 if (!dev->send_agent[port_num - 1][0]) 128 return; 129 130 memset(&ah_attr, 0, sizeof ah_attr); 131 ah_attr.dlid = lid; 132 ah_attr.sl = sl; 133 ah_attr.port_num = port_num; 134 135 new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd, 136 &ah_attr); 137 if (IS_ERR(new_ah)) 138 return; 139 140 spin_lock(&dev->sm_lock); 141 if (dev->sm_ah[port_num - 1]) 142 ib_destroy_ah(dev->sm_ah[port_num - 1]); 143 dev->sm_ah[port_num - 1] = new_ah; 144 spin_unlock(&dev->sm_lock); 145 } 146 147 /* 148 * Snoop SM MADs for port info and P_Key table sets, so we can 149 * synthesize LID change and P_Key change events. 150 */ 151 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad, 152 u16 prev_lid) 153 { 154 struct ib_event event; 155 156 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 157 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 158 mad->mad_hdr.method == IB_MGMT_METHOD_SET) { 159 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) { 160 struct ib_port_info *pinfo = 161 (struct ib_port_info *) ((struct ib_smp *) mad)->data; 162 u16 lid = be16_to_cpu(pinfo->lid); 163 164 update_sm_ah(to_mdev(ibdev), port_num, 165 be16_to_cpu(pinfo->sm_lid), 166 pinfo->neighbormtu_mastersmsl & 0xf); 167 168 event.device = ibdev; 169 event.element.port_num = port_num; 170 171 if (pinfo->clientrereg_resv_subnetto & 0x80) { 172 event.event = IB_EVENT_CLIENT_REREGISTER; 173 ib_dispatch_event(&event); 174 } 175 176 if (prev_lid != lid) { 177 event.event = IB_EVENT_LID_CHANGE; 178 ib_dispatch_event(&event); 179 } 180 } 181 182 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) { 183 event.device = ibdev; 184 event.event = IB_EVENT_PKEY_CHANGE; 185 event.element.port_num = port_num; 186 ib_dispatch_event(&event); 187 } 188 } 189 } 190 191 static void node_desc_override(struct ib_device *dev, 192 struct ib_mad *mad) 193 { 194 if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 195 mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 196 mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP && 197 mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) { 198 spin_lock(&to_mdev(dev)->sm_lock); 199 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64); 200 spin_unlock(&to_mdev(dev)->sm_lock); 201 } 202 } 203 204 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad) 205 { 206 int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED; 207 struct ib_mad_send_buf *send_buf; 208 struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn]; 209 int ret; 210 211 if (agent) { 212 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR, 213 IB_MGMT_MAD_DATA, GFP_ATOMIC); 214 /* 215 * We rely here on the fact that MLX QPs don't use the 216 * address handle after the send is posted (this is 217 * wrong following the IB spec strictly, but we know 218 * it's OK for our devices). 219 */ 220 spin_lock(&dev->sm_lock); 221 memcpy(send_buf->mad, mad, sizeof *mad); 222 if ((send_buf->ah = dev->sm_ah[port_num - 1])) 223 ret = ib_post_send_mad(send_buf, NULL); 224 else 225 ret = -EINVAL; 226 spin_unlock(&dev->sm_lock); 227 228 if (ret) 229 ib_free_send_mad(send_buf); 230 } 231 } 232 233 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num, 234 struct ib_wc *in_wc, struct ib_grh *in_grh, 235 struct ib_mad *in_mad, struct ib_mad *out_mad) 236 { 237 u16 slid, prev_lid = 0; 238 int err; 239 struct ib_port_attr pattr; 240 241 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE); 242 243 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) { 244 forward_trap(to_mdev(ibdev), port_num, in_mad); 245 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 246 } 247 248 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 249 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { 250 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 251 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET && 252 in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS) 253 return IB_MAD_RESULT_SUCCESS; 254 255 /* 256 * Don't process SMInfo queries or vendor-specific 257 * MADs -- the SMA can't handle them. 258 */ 259 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO || 260 ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) == 261 IB_SMP_ATTR_VENDOR_MASK)) 262 return IB_MAD_RESULT_SUCCESS; 263 } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT || 264 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1 || 265 in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2 || 266 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) { 267 if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET && 268 in_mad->mad_hdr.method != IB_MGMT_METHOD_SET) 269 return IB_MAD_RESULT_SUCCESS; 270 } else 271 return IB_MAD_RESULT_SUCCESS; 272 273 if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED || 274 in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) && 275 in_mad->mad_hdr.method == IB_MGMT_METHOD_SET && 276 in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO && 277 !ib_query_port(ibdev, port_num, &pattr)) 278 prev_lid = pattr.lid; 279 280 err = mlx4_MAD_IFC(to_mdev(ibdev), 281 mad_flags & IB_MAD_IGNORE_MKEY, 282 mad_flags & IB_MAD_IGNORE_BKEY, 283 port_num, in_wc, in_grh, in_mad, out_mad); 284 if (err) 285 return IB_MAD_RESULT_FAILURE; 286 287 if (!out_mad->mad_hdr.status) { 288 smp_snoop(ibdev, port_num, in_mad, prev_lid); 289 node_desc_override(ibdev, out_mad); 290 } 291 292 /* set return bit in status of directed route responses */ 293 if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 294 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15); 295 296 if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS) 297 /* no response for trap repress */ 298 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED; 299 300 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY; 301 } 302 303 static void send_handler(struct ib_mad_agent *agent, 304 struct ib_mad_send_wc *mad_send_wc) 305 { 306 ib_free_send_mad(mad_send_wc->send_buf); 307 } 308 309 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev) 310 { 311 struct ib_mad_agent *agent; 312 int p, q; 313 int ret; 314 315 for (p = 0; p < dev->num_ports; ++p) 316 for (q = 0; q <= 1; ++q) { 317 agent = ib_register_mad_agent(&dev->ib_dev, p + 1, 318 q ? IB_QPT_GSI : IB_QPT_SMI, 319 NULL, 0, send_handler, 320 NULL, NULL); 321 if (IS_ERR(agent)) { 322 ret = PTR_ERR(agent); 323 goto err; 324 } 325 dev->send_agent[p][q] = agent; 326 } 327 328 return 0; 329 330 err: 331 for (p = 0; p < dev->num_ports; ++p) 332 for (q = 0; q <= 1; ++q) 333 if (dev->send_agent[p][q]) 334 ib_unregister_mad_agent(dev->send_agent[p][q]); 335 336 return ret; 337 } 338 339 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev) 340 { 341 struct ib_mad_agent *agent; 342 int p, q; 343 344 for (p = 0; p < dev->num_ports; ++p) { 345 for (q = 0; q <= 1; ++q) { 346 agent = dev->send_agent[p][q]; 347 dev->send_agent[p][q] = NULL; 348 ib_unregister_mad_agent(agent); 349 } 350 351 if (dev->sm_ah[p]) 352 ib_destroy_ah(dev->sm_ah[p]); 353 } 354 } 355