SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  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 }