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
 114         if (!err)
 115                 memcpy(response_mad, outmailbox->buf, 256);
 116
 117         mlx4_free_cmd_mailbox(dev->dev, inmailbox);
 118         mlx4_free_cmd_mailbox(dev->dev, outmailbox);
 119
 120         return err;
 121 }
 122
 123 static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
 124 {
 125         struct ib_ah *new_ah;
 126         struct ib_ah_attr ah_attr;
 127
 128         if (!dev->send_agent[port_num - 1][0])
 129                 return;
 130
 131         memset(&ah_attr, 0, sizeof ah_attr);
 132         ah_attr.dlid     = lid;
 133         ah_attr.sl       = sl;
 134         ah_attr.port_num = port_num;
 135
 136         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
 137                               &ah_attr);
 138         if (IS_ERR(new_ah))
 139                 return;
 140
 141         spin_lock(&dev->sm_lock);
 142         if (dev->sm_ah[port_num - 1])
 143                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
 144         dev->sm_ah[port_num - 1] = new_ah;
 145         spin_unlock(&dev->sm_lock);
 146 }
 147
 148 /*
 149  * Snoop SM MADs for port info and P_Key table sets, so we can
 150  * synthesize LID change and P_Key change events.
 151  */
 152 static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad,
 153                                 u16 prev_lid)
 154 {
 155         struct ib_event event;
 156
 157         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 158              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 159             mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
 160                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 161                         struct ib_port_info *pinfo =
 162                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 163                         u16 lid = be16_to_cpu(pinfo->lid);
 164
 165                         update_sm_ah(to_mdev(ibdev), port_num,
 166                                      be16_to_cpu(pinfo->sm_lid),
 167                                      pinfo->neighbormtu_mastersmsl & 0xf);
 168
 169                         event.device           = ibdev;
 170                         event.element.port_num = port_num;
 171
 172                         if (pinfo->clientrereg_resv_subnetto & 0x80) {
 173                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 174                                 ib_dispatch_event(&event);
 175                         }
 176
 177                         if (prev_lid != lid) {
 178                                 event.event    = IB_EVENT_LID_CHANGE;
 179                                 ib_dispatch_event(&event);
 180                         }
 181                 }
 182
 183                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 184                         event.device           = ibdev;
 185                         event.event            = IB_EVENT_PKEY_CHANGE;
 186                         event.element.port_num = port_num;
 187                         ib_dispatch_event(&event);
 188                 }
 189         }
 190 }
 191
 192 static void node_desc_override(struct ib_device *dev,
 193                                struct ib_mad *mad)
 194 {
 195         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 196              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 197             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 198             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 199                 spin_lock(&to_mdev(dev)->sm_lock);
 200                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 201                 spin_unlock(&to_mdev(dev)->sm_lock);
 202         }
 203 }
 204
 205 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
 206 {
 207         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 208         struct ib_mad_send_buf *send_buf;
 209         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 210         int ret;
 211
 212         if (agent) {
 213                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 214                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 215                 if (IS_ERR(send_buf))
 216                         return;
 217                 /*
 218                  * We rely here on the fact that MLX QPs don't use the
 219                  * address handle after the send is posted (this is
 220                  * wrong following the IB spec strictly, but we know
 221                  * it's OK for our devices).
 222                  */
 223                 spin_lock(&dev->sm_lock);
 224                 memcpy(send_buf->mad, mad, sizeof *mad);
 225                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 226                         ret = ib_post_send_mad(send_buf, NULL);
 227                 else
 228                         ret = -EINVAL;
 229                 spin_unlock(&dev->sm_lock);
 230
 231                 if (ret)
 232                         ib_free_send_mad(send_buf);
 233         }
 234 }
 235
 236 static int ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 237                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 238                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 239 {
 240         u16 slid, prev_lid = 0;
 241         int err;
 242         struct ib_port_attr pattr;
 243
 244         slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 245
 246         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
 247                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 248                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 249         }
 250
 251         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 252             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 253                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 254                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 255                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 256                         return IB_MAD_RESULT_SUCCESS;
 257
 258                 /*
 259                  * Don't process SMInfo queries -- the SMA can't handle them.
 260                  */
 261                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
 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 edit_counter(struct mlx4_counter *cnt,
 304                                         struct ib_pma_portcounters *pma_cnt)
 305 {
 306         pma_cnt->port_xmit_data = cpu_to_be32((be64_to_cpu(cnt->tx_bytes)>>2));
 307         pma_cnt->port_rcv_data  = cpu_to_be32((be64_to_cpu(cnt->rx_bytes)>>2));
 308         pma_cnt->port_xmit_packets = cpu_to_be32(be64_to_cpu(cnt->tx_frames));
 309         pma_cnt->port_rcv_packets  = cpu_to_be32(be64_to_cpu(cnt->rx_frames));
 310 }
 311
 312 static int iboe_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 313                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 314                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 315 {
 316         struct mlx4_cmd_mailbox *mailbox;
 317         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 318         int err;
 319         u32 inmod = dev->counters[port_num - 1] & 0xffff;
 320         u8 mode;
 321
 322         if (in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_PERF_MGMT)
 323                 return -EINVAL;
 324
 325         mailbox = mlx4_alloc_cmd_mailbox(dev->dev);
 326         if (IS_ERR(mailbox))
 327                 return IB_MAD_RESULT_FAILURE;
 328
 329         err = mlx4_cmd_box(dev->dev, 0, mailbox->dma, inmod, 0,
 330                            MLX4_CMD_QUERY_IF_STAT, MLX4_CMD_TIME_CLASS_C);
 331         if (err)
 332                 err = IB_MAD_RESULT_FAILURE;
 333         else {
 334                 memset(out_mad->data, 0, sizeof out_mad->data);
 335                 mode = ((struct mlx4_counter *)mailbox->buf)->counter_mode;
 336                 switch (mode & 0xf) {
 337                 case 0:
 338                         edit_counter(mailbox->buf,
 339                                                 (void *)(out_mad->data + 40));
 340                         err = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 341                         break;
 342                 default:
 343                         err = IB_MAD_RESULT_FAILURE;
 344                 }
 345         }
 346
 347         mlx4_free_cmd_mailbox(dev->dev, mailbox);
 348
 349         return err;
 350 }
 351
 352 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 353                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 354                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 355 {
 356         switch (rdma_port_get_link_layer(ibdev, port_num)) {
 357         case IB_LINK_LAYER_INFINIBAND:
 358                 return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
 359                                       in_grh, in_mad, out_mad);
 360         case IB_LINK_LAYER_ETHERNET:
 361                 return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
 362                                           in_grh, in_mad, out_mad);
 363         default:
 364                 return -EINVAL;
 365         }
 366 }
 367
 368 static void send_handler(struct ib_mad_agent *agent,
 369                          struct ib_mad_send_wc *mad_send_wc)
 370 {
 371         ib_free_send_mad(mad_send_wc->send_buf);
 372 }
 373
 374 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
 375 {
 376         struct ib_mad_agent *agent;
 377         int p, q;
 378         int ret;
 379         enum rdma_link_layer ll;
 380
 381         for (p = 0; p < dev->num_ports; ++p) {
 382                 ll = rdma_port_get_link_layer(&dev->ib_dev, p + 1);
 383                 for (q = 0; q <= 1; ++q) {
 384                         if (ll == IB_LINK_LAYER_INFINIBAND) {
 385                                 agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 386                                                               q ? IB_QPT_GSI : IB_QPT_SMI,
 387                                                               NULL, 0, send_handler,
 388                                                               NULL, NULL);
 389                                 if (IS_ERR(agent)) {
 390                                         ret = PTR_ERR(agent);
 391                                         goto err;
 392                                 }
 393                                 dev->send_agent[p][q] = agent;
 394                         } else
 395                                 dev->send_agent[p][q] = NULL;
 396                 }
 397         }
 398
 399         return 0;
 400
 401 err:
 402         for (p = 0; p < dev->num_ports; ++p)
 403                 for (q = 0; q <= 1; ++q)
 404                         if (dev->send_agent[p][q])
 405                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 406
 407         return ret;
 408 }
 409
 410 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
 411 {
 412         struct ib_mad_agent *agent;
 413         int p, q;
 414
 415         for (p = 0; p < dev->num_ports; ++p) {
 416                 for (q = 0; q <= 1; ++q) {
 417                         agent = dev->send_agent[p][q];
 418                         if (agent) {
 419                                 dev->send_agent[p][q] = NULL;
 420                                 ib_unregister_mad_agent(agent);
 421                         }
 422                 }
 423
 424                 if (dev->sm_ah[p])
 425                         ib_destroy_ah(dev->sm_ah[p]);
 426         }
 427 }