drivers/infiniband/hw/mthca/mthca_mad.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  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  * $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
  33  */
  34
  35 #include <ib_verbs.h>
  36 #include <ib_mad.h>
  37 #include <ib_smi.h>
  38
  39 #include "mthca_dev.h"
  40 #include "mthca_cmd.h"
  41
  42 enum {
  43         MTHCA_VENDOR_CLASS1 = 0x9,
  44         MTHCA_VENDOR_CLASS2 = 0xa
  45 };
  46
  47 struct mthca_trap_mad {
  48         struct ib_mad *mad;
  49         DECLARE_PCI_UNMAP_ADDR(mapping)
  50 };
  51
  52 static void update_sm_ah(struct mthca_dev *dev,
  53                          u8 port_num, u16 lid, u8 sl)
  54 {
  55         struct ib_ah *new_ah;
  56         struct ib_ah_attr ah_attr;
  57         unsigned long flags;
  58
  59         if (!dev->send_agent[port_num - 1][0])
  60                 return;
  61
  62         memset(&ah_attr, 0, sizeof ah_attr);
  63         ah_attr.dlid     = lid;
  64         ah_attr.sl       = sl;
  65         ah_attr.port_num = port_num;
  66
  67         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  68                               &ah_attr);
  69         if (IS_ERR(new_ah))
  70                 return;
  71
  72         spin_lock_irqsave(&dev->sm_lock, flags);
  73         if (dev->sm_ah[port_num - 1])
  74                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
  75         dev->sm_ah[port_num - 1] = new_ah;
  76         spin_unlock_irqrestore(&dev->sm_lock, flags);
  77 }
  78
  79 /*
  80  * Snoop SM MADs for port info and P_Key table sets, so we can
  81  * synthesize LID change and P_Key change events.
  82  */
  83 static void smp_snoop(struct ib_device *ibdev,
  84                       u8 port_num,
  85                       struct ib_mad *mad)
  86 {
  87         struct ib_event event;
  88
  89         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
  90              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
  91             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
  92                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
  93                         update_sm_ah(to_mdev(ibdev), port_num,
  94                                      be16_to_cpup((__be16 *) (mad->data + 58)),
  95                                      (*(u8 *) (mad->data + 76)) & 0xf);
  96
  97                         event.device           = ibdev;
  98                         event.event            = IB_EVENT_LID_CHANGE;
  99                         event.element.port_num = port_num;
 100                         ib_dispatch_event(&event);
 101                 }
 102
 103                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 104                         event.device           = ibdev;
 105                         event.event            = IB_EVENT_PKEY_CHANGE;
 106                         event.element.port_num = port_num;
 107                         ib_dispatch_event(&event);
 108                 }
 109         }
 110 }
 111
 112 static void forward_trap(struct mthca_dev *dev,
 113                          u8 port_num,
 114                          struct ib_mad *mad)
 115 {
 116         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 117         struct mthca_trap_mad *tmad;
 118         struct ib_sge      gather_list;
 119         struct ib_send_wr *bad_wr, wr = {
 120                 .opcode      = IB_WR_SEND,
 121                 .sg_list     = &gather_list,
 122                 .num_sge     = 1,
 123                 .send_flags  = IB_SEND_SIGNALED,
 124                 .wr          = {
 125                          .ud = {
 126                                  .remote_qpn  = qpn,
 127                                  .remote_qkey = qpn ? IB_QP1_QKEY : 0,
 128                                  .timeout_ms  = 0
 129                          }
 130                  }
 131         };
 132         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 133         int ret;
 134         unsigned long flags;
 135
 136         if (agent) {
 137                 tmad = kmalloc(sizeof *tmad, GFP_KERNEL);
 138                 if (!tmad)
 139                         return;
 140
 141                 tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL);
 142                 if (!tmad->mad) {
 143                         kfree(tmad);
 144                         return;
 145                 }
 146
 147                 memcpy(tmad->mad, mad, sizeof *mad);
 148
 149                 wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr;
 150                 wr.wr_id         = (unsigned long) tmad;
 151
 152                 gather_list.addr   = dma_map_single(agent->device->dma_device,
 153                                                     tmad->mad,
 154                                                     sizeof *tmad->mad,
 155                                                     DMA_TO_DEVICE);
 156                 gather_list.length = sizeof *tmad->mad;
 157                 gather_list.lkey   = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey;
 158                 pci_unmap_addr_set(tmad, mapping, gather_list.addr);
 159
 160                 /*
 161                  * We rely here on the fact that MLX QPs don't use the
 162                  * address handle after the send is posted (this is
 163                  * wrong following the IB spec strictly, but we know
 164                  * it's OK for our devices).
 165                  */
 166                 spin_lock_irqsave(&dev->sm_lock, flags);
 167                 wr.wr.ud.ah      = dev->sm_ah[port_num - 1];
 168                 if (wr.wr.ud.ah)
 169                         ret = ib_post_send_mad(agent, &wr, &bad_wr);
 170                 else
 171                         ret = -EINVAL;
 172                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 173
 174                 if (ret) {
 175                         dma_unmap_single(agent->device->dma_device,
 176                                          pci_unmap_addr(tmad, mapping),
 177                                          sizeof *tmad->mad,
 178                                          DMA_TO_DEVICE);
 179                         kfree(tmad->mad);
 180                         kfree(tmad);
 181                 }
 182         }
 183 }
 184
 185 int mthca_process_mad(struct ib_device *ibdev,
 186                       int mad_flags,
 187                       u8 port_num,
 188                       struct ib_wc *in_wc,
 189                       struct ib_grh *in_grh,
 190                       struct ib_mad *in_mad,
 191                       struct ib_mad *out_mad)
 192 {
 193         int err;
 194         u8 status;
 195         u16 slid = in_wc ? in_wc->slid : IB_LID_PERMISSIVE;
 196
 197         /* Forward locally generated traps to the SM */
 198         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 199             slid == 0) {
 200                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 201                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 202         }
 203
 204         /*
 205          * Only handle SM gets, sets and trap represses for SM class
 206          *
 207          * Only handle PMA and Mellanox vendor-specific class gets and
 208          * sets for other classes.
 209          */
 210         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 211             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 212                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 213                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 214                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 215                         return IB_MAD_RESULT_SUCCESS;
 216
 217                 /*
 218                  * Don't process SMInfo queries or vendor-specific
 219                  * MADs -- the SMA can't handle them.
 220                  */
 221                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 222                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 223                      IB_SMP_ATTR_VENDOR_MASK))
 224                         return IB_MAD_RESULT_SUCCESS;
 225         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 226                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 227                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 228                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 229                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 230                         return IB_MAD_RESULT_SUCCESS;
 231         } else
 232                 return IB_MAD_RESULT_SUCCESS;
 233
 234         err = mthca_MAD_IFC(to_mdev(ibdev),
 235                             mad_flags & IB_MAD_IGNORE_MKEY,
 236                             mad_flags & IB_MAD_IGNORE_BKEY,
 237                             port_num, in_wc, in_grh, in_mad, out_mad,
 238                             &status);
 239         if (err) {
 240                 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
 241                 return IB_MAD_RESULT_FAILURE;
 242         }
 243         if (status == MTHCA_CMD_STAT_BAD_PKT)
 244                 return IB_MAD_RESULT_SUCCESS;
 245         if (status) {
 246                 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
 247                           status);
 248                 return IB_MAD_RESULT_FAILURE;
 249         }
 250
 251         if (!out_mad->mad_hdr.status)
 252                 smp_snoop(ibdev, port_num, in_mad);
 253
 254         /* set return bit in status of directed route responses */
 255         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 256                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 257
 258         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 259                 /* no response for trap repress */
 260                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 261
 262         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 263 }
 264
 265 static void send_handler(struct ib_mad_agent *agent,
 266                          struct ib_mad_send_wc *mad_send_wc)
 267 {
 268         struct mthca_trap_mad *tmad =
 269                 (void *) (unsigned long) mad_send_wc->wr_id;
 270
 271         dma_unmap_single(agent->device->dma_device,
 272                          pci_unmap_addr(tmad, mapping),
 273                          sizeof *tmad->mad,
 274                          DMA_TO_DEVICE);
 275         kfree(tmad->mad);
 276         kfree(tmad);
 277 }
 278
 279 int mthca_create_agents(struct mthca_dev *dev)
 280 {
 281         struct ib_mad_agent *agent;
 282         int p, q;
 283
 284         spin_lock_init(&dev->sm_lock);
 285
 286         for (p = 0; p < dev->limits.num_ports; ++p)
 287                 for (q = 0; q <= 1; ++q) {
 288                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 289                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 290                                                       NULL, 0, send_handler,
 291                                                       NULL, NULL);
 292                         if (IS_ERR(agent))
 293                                 goto err;
 294                         dev->send_agent[p][q] = agent;
 295                 }
 296
 297         return 0;
 298
 299 err:
 300         for (p = 0; p < dev->limits.num_ports; ++p)
 301                 for (q = 0; q <= 1; ++q)
 302                         if (dev->send_agent[p][q])
 303                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 304
 305         return PTR_ERR(agent);
 306 }
 307
 308 void mthca_free_agents(struct mthca_dev *dev)
 309 {
 310         struct ib_mad_agent *agent;
 311         int p, q;
 312
 313         for (p = 0; p < dev->limits.num_ports; ++p) {
 314                 for (q = 0; q <= 1; ++q) {
 315                         agent = dev->send_agent[p][q];
 316                         dev->send_agent[p][q] = NULL;
 317                         ib_unregister_mad_agent(agent);
 318                 }
 319
 320                 if (dev->sm_ah[p])
 321                         ib_destroy_ah(dev->sm_ah[p]);
 322         }
 323 }