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