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 {
 152         struct ib_event event;
 153
 154         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 155              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 156             mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
 157                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 158                         struct ib_port_info *pinfo =
 159                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 160
 161                         update_sm_ah(to_mdev(ibdev), port_num,
 162                                      be16_to_cpu(pinfo->sm_lid),
 163                                      pinfo->neighbormtu_mastersmsl & 0xf);
 164
 165                         event.device           = ibdev;
 166                         event.element.port_num = port_num;
 167
 168                         if (pinfo->clientrereg_resv_subnetto & 0x80)
 169                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 170                         else
 171                                 event.event    = IB_EVENT_LID_CHANGE;
 172
 173                         ib_dispatch_event(&event);
 174                 }
 175
 176                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 177                         event.device           = ibdev;
 178                         event.event            = IB_EVENT_PKEY_CHANGE;
 179                         event.element.port_num = port_num;
 180                         ib_dispatch_event(&event);
 181                 }
 182         }
 183 }
 184
 185 static void node_desc_override(struct ib_device *dev,
 186                                struct ib_mad *mad)
 187 {
 188         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 189              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 190             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 191             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 192                 spin_lock(&to_mdev(dev)->sm_lock);
 193                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 194                 spin_unlock(&to_mdev(dev)->sm_lock);
 195         }
 196 }
 197
 198 static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
 199 {
 200         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 201         struct ib_mad_send_buf *send_buf;
 202         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 203         int ret;
 204
 205         if (agent) {
 206                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 207                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 208                 /*
 209                  * We rely here on the fact that MLX QPs don't use the
 210                  * address handle after the send is posted (this is
 211                  * wrong following the IB spec strictly, but we know
 212                  * it's OK for our devices).
 213                  */
 214                 spin_lock(&dev->sm_lock);
 215                 memcpy(send_buf->mad, mad, sizeof *mad);
 216                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 217                         ret = ib_post_send_mad(send_buf, NULL);
 218                 else
 219                         ret = -EINVAL;
 220                 spin_unlock(&dev->sm_lock);
 221
 222                 if (ret)
 223                         ib_free_send_mad(send_buf);
 224         }
 225 }
 226
 227 int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 228                         struct ib_wc *in_wc, struct ib_grh *in_grh,
 229                         struct ib_mad *in_mad, struct ib_mad *out_mad)
 230 {
 231         u16 slid;
 232         int err;
 233
 234         slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 235
 236         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
 237                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 238                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 239         }
 240
 241         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 242             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 243                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 244                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 245                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 246                         return IB_MAD_RESULT_SUCCESS;
 247
 248                 /*
 249                  * Don't process SMInfo queries or vendor-specific
 250                  * MADs -- the SMA can't handle them.
 251                  */
 252                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 253                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 254                      IB_SMP_ATTR_VENDOR_MASK))
 255                         return IB_MAD_RESULT_SUCCESS;
 256         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 257                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
 258                    in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2   ||
 259                    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
 260                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 261                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 262                         return IB_MAD_RESULT_SUCCESS;
 263         } else
 264                 return IB_MAD_RESULT_SUCCESS;
 265
 266         err = mlx4_MAD_IFC(to_mdev(ibdev),
 267                            mad_flags & IB_MAD_IGNORE_MKEY,
 268                            mad_flags & IB_MAD_IGNORE_BKEY,
 269                            port_num, in_wc, in_grh, in_mad, out_mad);
 270         if (err)
 271                 return IB_MAD_RESULT_FAILURE;
 272
 273         if (!out_mad->mad_hdr.status) {
 274                 smp_snoop(ibdev, port_num, in_mad);
 275                 node_desc_override(ibdev, out_mad);
 276         }
 277
 278         /* set return bit in status of directed route responses */
 279         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 280                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 281
 282         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 283                 /* no response for trap repress */
 284                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 285
 286         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 287 }
 288
 289 static void send_handler(struct ib_mad_agent *agent,
 290                          struct ib_mad_send_wc *mad_send_wc)
 291 {
 292         ib_free_send_mad(mad_send_wc->send_buf);
 293 }
 294
 295 int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
 296 {
 297         struct ib_mad_agent *agent;
 298         int p, q;
 299         int ret;
 300
 301         for (p = 0; p < dev->dev->caps.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);
 307                         if (IS_ERR(agent)) {
 308                                 ret = PTR_ERR(agent);
 309                                 goto err;
 310                         }
 311                         dev->send_agent[p][q] = agent;
 312                 }
 313
 314         return 0;
 315
 316 err:
 317         for (p = 0; p < dev->dev->caps.num_ports; ++p)
 318                 for (q = 0; q <= 1; ++q)
 319                         if (dev->send_agent[p][q])
 320                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 321
 322         return ret;
 323 }
 324
 325 void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
 326 {
 327         struct ib_mad_agent *agent;
 328         int p, q;
 329
 330         for (p = 0; p < dev->dev->caps.num_ports; ++p) {
 331                 for (q = 0; q <= 1; ++q) {
 332                         agent = dev->send_agent[p][q];
 333                         dev->send_agent[p][q] = NULL;
 334                         ib_unregister_mad_agent(agent);
 335                 }
 336
 337                 if (dev->sm_ah[p])
 338                         ib_destroy_ah(dev->sm_ah[p]);
 339         }
 340 }