drivers/infiniband/hw/mlx4/mad.c

   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 #include <rdma/ib_pma.h>
  39
  40 #include "mlx4_ib.h"
  41
  42 enum {
  43         MLX4_IB_VENDOR_CLASS1 = 0x9,
  44         MLX4_IB_VENDOR_CLASS2 = 0xa
  45 };
  46
  47 int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
  48                  int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
  49                  void *in_mad, void *response_mad)
  50 {
  51         struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
  52         void *inbox;
  53         int err;
  54         u32 in_modifier = port;
  55         u8 op_modifier = 0;
  56
  57         inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
  58         if (IS_ERR(inmailbox))
  59                 return PTR_ERR(inmailbox);
  60         inbox = inmailbox->buf;
  61
  62         outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
  63         if (IS_ERR(outmailbox)) {
  64                 mlx4_free_cmd_mailbox(dev->dev, inmailbox);
  65                 return PTR_ERR(outmailbox);
  66         }
  67
  68         memcpy(inbox, in_mad, 256);
  69
  70         /*
  71          * Key check traps can't be generated unless we have in_wc to
  72          * tell us where to send the trap.
  73          */
  74         if (ignore_mkey || !in_wc)
  75                 op_modifier |= 0x1;
  76         if (ignore_bkey || !in_wc)
  77                 op_modifier |= 0x2;
  78
  79         if (in_wc) {
  80                 struct {
  81                         __be32          my_qpn;
  82                         u32             reserved1;
  83                         __be32          rqpn;
  84                         u8              sl;
  85                         u8              g_path;
  86                         u16             reserved2[2];
  87                         __be16          pkey;
  88                         u32             reserved3[11];
  89                         u8              grh[40];
  90                 } *ext_info;
  91
  92                 memset(inbox + 256, 0, 256);
  93                 ext_info = inbox + 256;
  94
  95                 ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
  96                 ext_info->rqpn   = cpu_to_be32(in_wc->src_qp);
  97                 ext_info->sl     = in_wc->sl << 4;
  98                 ext_info->g_path = in_wc->dlid_path_bits |
  99                         (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
 100                 ext_info->pkey   = cpu_to_be16(in_wc->pkey_index);
 101
 102                 if (in_grh)
 103                         memcpy(ext_info->grh, in_grh, 40);
 104
 105                 op_modifier |= 0x4;
 106
 107                 in_modifier |= in_wc->slid << 16;
 108         }
 109
 110         err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
 111                            in_modifier, op_modifier,
 112                            MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C,
 113                            MLX4_CMD_NATIVE);
 114
 115         if (!err)
 116                 memcpy(response_mad, outmailbox->buf, 256);
 117
 118         mlx4_free_cmd_mailbox(dev->dev, inmailbox);
 119         mlx4_free_cmd_mailbox(dev->dev, outmailbox);
 120
 121         return err;
 122 }
 123
 124 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
 125 {
 126         struct ib_ah *new_ah;
 127         struct ib_ah_attr ah_attr;
 128
 129         if (!dev->send_agent[port_num - 1][0])
 130                 return;
 131
 132         memset(&ah_attr, 0, sizeof ah_attr);
 133         ah_attr.dlid     = lid;
 134         ah_attr.sl       = sl;
 135         ah_attr.port_num = port_num;
 136
 137         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
 138                               &ah_attr);
 139         if (IS_ERR(new_ah))
 140                 return;
 141
 142         spin_lock(&dev->sm_lock);
 143         if (dev->sm_ah[port_num - 1])
 144                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
 145         dev->sm_ah[port_num - 1] = new_ah;
 146         spin_unlock(&dev->sm_lock);
 147 }
 148
 149 /*
 150  * Snoop SM MADs for port info and P_Key table sets, so we can
 151  * synthesize LID change and P_Key change events.
 152  */
 153 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad,
 154                                 u16 prev_lid)
 155 {
 156         struct ib_event event;
 157
 158         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 159              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 160             mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
 161                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 162                         struct ib_port_info *pinfo =
 163                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 164                         u16 lid = be16_to_cpu(pinfo->lid);
 165
 166                         update_sm_ah(to_mdev(ibdev), port_num,
 167                                      be16_to_cpu(pinfo->sm_lid),
 168                                      pinfo->neighbormtu_mastersmsl & 0xf);
 169
 170                         event.device           = ibdev;
 171                         event.element.port_num = port_num;
 172
 173                         if (pinfo->clientrereg_resv_subnetto & 0x80) {
 174                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 175                                 ib_dispatch_event(&event);
 176                         }
 177
 178                         if (prev_lid != lid) {
 179                                 event.event    = IB_EVENT_LID_CHANGE;
 180                                 ib_dispatch_event(&event);
 181                         }
 182                 }
 183
 184                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 185                         event.device           = ibdev;
 186                         event.event            = IB_EVENT_PKEY_CHANGE;
 187                         event.element.port_num = port_num;
 188                         ib_dispatch_event(&event);
 189                 }
 190         }
 191 }
 192
 193 static void node_desc_override(struct ib_device *dev,
 194                                struct ib_mad *mad)
 195 {
 196         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 197              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 198             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 199             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 200                 spin_lock(&to_mdev(dev)->sm_lock);
 201                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 202                 spin_unlock(&to_mdev(dev)->sm_lock);
 203         }
 204 }
 205
 206 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
 207 {
 208         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 209         struct ib_mad_send_buf *send_buf;
 210         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 211         int ret;
 212
 213         if (agent) {
 214                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 215                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 216                 if (IS_ERR(send_buf))
 217                         return;
 218                 /*
 219                  * We rely here on the fact that MLX QPs don't use the
 220                  * address handle after the send is posted (this is
 221                  * wrong following the IB spec strictly, but we know
 222                  * it's OK for our devices).
 223                  */
 224                 spin_lock(&dev->sm_lock);
 225                 memcpy(send_buf->mad, mad, sizeof *mad);
 226                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 227                         ret = ib_post_send_mad(send_buf, NULL);
 228                 else
 229                         ret = -EINVAL;
 230                 spin_unlock(&dev->sm_lock);
 231
 232                 if (ret)
 233                         ib_free_send_mad(send_buf);
 234         }
 235 }
 236
 237 static int ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 238                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 239                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 240 {
 241         u16 slid, prev_lid = 0;
 242         int err;
 243         struct ib_port_attr pattr;
 244
 245         slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 246
 247         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
 248                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 249                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 250         }
 251
 252         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 253             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 254                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 255                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 256                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 257                         return IB_MAD_RESULT_SUCCESS;
 258
 259                 /*
 260                  * Don't process SMInfo queries or vendor-specific
 261                  * MADs -- the SMA can't handle them.
 262                  */
 263                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 264                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 265                      IB_SMP_ATTR_VENDOR_MASK))
 266                         return IB_MAD_RESULT_SUCCESS;
 267         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 268                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
 269                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2   ||
 270                    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
 271                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 272                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 273                         return IB_MAD_RESULT_SUCCESS;
 274         } else
 275                 return IB_MAD_RESULT_SUCCESS;
 276
 277         if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 278              in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 279             in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
 280             in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 281             !ib_query_port(ibdev, port_num, &pattr))
 282                 prev_lid = pattr.lid;
 283
 284         err = mlx4_MAD_IFC(to_mdev(ibdev),
 285                            mad_flags & IB_MAD_IGNORE_MKEY,
 286                            mad_flags & IB_MAD_IGNORE_BKEY,
 287                            port_num, in_wc, in_grh, in_mad, out_mad);
 288         if (err)
 289                 return IB_MAD_RESULT_FAILURE;
 290
 291         if (!out_mad->mad_hdr.status) {
 292                 smp_snoop(ibdev, port_num, in_mad, prev_lid);
 293                 node_desc_override(ibdev, out_mad);
 294         }
 295
 296         /* set return bit in status of directed route responses */
 297         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 298                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 299
 300         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 301                 /* no response for trap repress */
 302                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 303
 304         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 305 }
 306
 307 static void edit_counter(struct mlx4_counter *cnt,
 308                                         struct ib_pma_portcounters *pma_cnt)
 309 {
 310         pma_cnt->port_xmit_data = cpu_to_be32((be64_to_cpu(cnt->tx_bytes)>>2));
 311         pma_cnt->port_rcv_data  = cpu_to_be32((be64_to_cpu(cnt->rx_bytes)>>2));
 312         pma_cnt->port_xmit_packets = cpu_to_be32(be64_to_cpu(cnt->tx_frames));
 313         pma_cnt->port_rcv_packets  = cpu_to_be32(be64_to_cpu(cnt->rx_frames));
 314 }
 315
 316 static int iboe_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 317                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 318                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 319 {
 320         struct mlx4_cmd_mailbox *mailbox;
 321         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 322         int err;
 323         u32 inmod = dev->counters[port_num - 1] & 0xffff;
 324         u8 mode;
 325
 326         if (in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_PERF_MGMT)
 327                 return -EINVAL;
 328
 329         mailbox = mlx4_alloc_cmd_mailbox(dev->dev);
 330         if (IS_ERR(mailbox))
 331                 return IB_MAD_RESULT_FAILURE;
 332
 333         err = mlx4_cmd_box(dev->dev, 0, mailbox->dma, inmod, 0,
 334                            MLX4_CMD_QUERY_IF_STAT, MLX4_CMD_TIME_CLASS_C,
 335                            MLX4_CMD_WRAPPED);
 336         if (err)
 337                 err = IB_MAD_RESULT_FAILURE;
 338         else {
 339                 memset(out_mad->data, 0, sizeof out_mad->data);
 340                 mode = ((struct mlx4_counter *)mailbox->buf)->counter_mode;
 341                 switch (mode & 0xf) {
 342                 case 0:
 343                         edit_counter(mailbox->buf,
 344                                                 (void *)(out_mad->data + 40));
 345                         err = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 346                         break;
 347                 default:
 348                         err = IB_MAD_RESULT_FAILURE;
 349                 }
 350         }
 351
 352         mlx4_free_cmd_mailbox(dev->dev, mailbox);
 353
 354         return err;
 355 }
 356
 357 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 358                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 359                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 360 {
 361         switch (rdma_port_get_link_layer(ibdev, port_num)) {
 362         case IB_LINK_LAYER_INFINIBAND:
 363                 return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
 364                                       in_grh, in_mad, out_mad);
 365         case IB_LINK_LAYER_ETHERNET:
 366                 return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
 367                                           in_grh, in_mad, out_mad);
 368         default:
 369                 return -EINVAL;
 370         }
 371 }
 372
 373 static void send_handler(struct ib_mad_agent *agent,
 374                          struct ib_mad_send_wc *mad_send_wc)
 375 {
 376         ib_free_send_mad(mad_send_wc->send_buf);
 377 }
 378
 379 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
 380 {
 381         struct ib_mad_agent *agent;
 382         int p, q;
 383         int ret;
 384         enum rdma_link_layer ll;
 385
 386         for (p = 0; p < dev->num_ports; ++p) {
 387                 ll = rdma_port_get_link_layer(&dev->ib_dev, p + 1);
 388                 for (q = 0; q <= 1; ++q) {
 389                         if (ll == IB_LINK_LAYER_INFINIBAND) {
 390                                 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 391                                                               q ? IB_QPT_GSI : IB_QPT_SMI,
 392                                                               NULL, 0, send_handler,
 393                                                               NULL, NULL);
 394                                 if (IS_ERR(agent)) {
 395                                         ret = PTR_ERR(agent);
 396                                         goto err;
 397                                 }
 398                                 dev->send_agent[p][q] = agent;
 399                         } else
 400                                 dev->send_agent[p][q] = NULL;
 401                 }
 402         }
 403
 404         return 0;
 405
 406 err:
 407         for (p = 0; p < dev->num_ports; ++p)
 408                 for (q = 0; q <= 1; ++q)
 409                         if (dev->send_agent[p][q])
 410                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 411
 412         return ret;
 413 }
 414
 415 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
 416 {
 417         struct ib_mad_agent *agent;
 418         int p, q;
 419
 420         for (p = 0; p < dev->num_ports; ++p) {
 421                 for (q = 0; q <= 1; ++q) {
 422                         agent = dev->send_agent[p][q];
 423                         if (agent) {
 424                                 dev->send_agent[p][q] = NULL;
 425                                 ib_unregister_mad_agent(agent);
 426                         }
 427                 }
 428
 429                 if (dev->sm_ah[p])
 430                         ib_destroy_ah(dev->sm_ah[p]);
 431         }
 432 }