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   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: mthca_mad.c 1349 2004-12-16 21:09:43Z roland $
  35  */
  36
  37 #include <ib_verbs.h>
  38 #include <ib_mad.h>
  39 #include <ib_smi.h>
  40
  41 #include "mthca_dev.h"
  42 #include "mthca_cmd.h"
  43
  44 enum {
  45         MTHCA_VENDOR_CLASS1 = 0x9,
  46         MTHCA_VENDOR_CLASS2 = 0xa
  47 };
  48
  49 struct mthca_trap_mad {
  50         struct ib_mad *mad;
  51         DECLARE_PCI_UNMAP_ADDR(mapping)
  52 };
  53
  54 static void update_sm_ah(struct mthca_dev *dev,
  55                          u8 port_num, u16 lid, u8 sl)
  56 {
  57         struct ib_ah *new_ah;
  58         struct ib_ah_attr ah_attr;
  59         unsigned long flags;
  60
  61         if (!dev->send_agent[port_num - 1][0])
  62                 return;
  63
  64         memset(&ah_attr, 0, sizeof ah_attr);
  65         ah_attr.dlid     = lid;
  66         ah_attr.sl       = sl;
  67         ah_attr.port_num = port_num;
  68
  69         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  70                               &ah_attr);
  71         if (IS_ERR(new_ah))
  72                 return;
  73
  74         spin_lock_irqsave(&dev->sm_lock, flags);
  75         if (dev->sm_ah[port_num - 1])
  76                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
  77         dev->sm_ah[port_num - 1] = new_ah;
  78         spin_unlock_irqrestore(&dev->sm_lock, flags);
  79 }
  80
  81 /*
  82  * Snoop SM MADs for port info and P_Key table sets, so we can
  83  * synthesize LID change and P_Key change events.
  84  */
  85 static void smp_snoop(struct ib_device *ibdev,
  86                       u8 port_num,
  87                       struct ib_mad *mad)
  88 {
  89         struct ib_event event;
  90
  91         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
  92              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
  93             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
  94                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
  95                         update_sm_ah(to_mdev(ibdev), port_num,
  96                                      be16_to_cpup((__be16 *) (mad->data + 58)),
  97                                      (*(u8 *) (mad->data + 76)) & 0xf);
  98
  99                         event.device           = ibdev;
 100                         event.event            = IB_EVENT_LID_CHANGE;
 101                         event.element.port_num = port_num;
 102                         ib_dispatch_event(&event);
 103                 }
 104
 105                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 106                         event.device           = ibdev;
 107                         event.event            = IB_EVENT_PKEY_CHANGE;
 108                         event.element.port_num = port_num;
 109                         ib_dispatch_event(&event);
 110                 }
 111         }
 112 }
 113
 114 static void forward_trap(struct mthca_dev *dev,
 115                          u8 port_num,
 116                          struct ib_mad *mad)
 117 {
 118         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 119         struct mthca_trap_mad *tmad;
 120         struct ib_sge      gather_list;
 121         struct ib_send_wr *bad_wr, wr = {
 122                 .opcode      = IB_WR_SEND,
 123                 .sg_list     = &gather_list,
 124                 .num_sge     = 1,
 125                 .send_flags  = IB_SEND_SIGNALED,
 126                 .wr          = {
 127                          .ud = {
 128                                  .remote_qpn  = qpn,
 129                                  .remote_qkey = qpn ? IB_QP1_QKEY : 0,
 130                                  .timeout_ms  = 0
 131                          }
 132                  }
 133         };
 134         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 135         int ret;
 136         unsigned long flags;
 137
 138         if (agent) {
 139                 tmad = kmalloc(sizeof *tmad, GFP_KERNEL);
 140                 if (!tmad)
 141                         return;
 142
 143                 tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL);
 144                 if (!tmad->mad) {
 145                         kfree(tmad);
 146                         return;
 147                 }
 148
 149                 memcpy(tmad->mad, mad, sizeof *mad);
 150
 151                 wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr;
 152                 wr.wr_id         = (unsigned long) tmad;
 153
 154                 gather_list.addr   = dma_map_single(agent->device->dma_device,
 155                                                     tmad->mad,
 156                                                     sizeof *tmad->mad,
 157                                                     DMA_TO_DEVICE);
 158                 gather_list.length = sizeof *tmad->mad;
 159                 gather_list.lkey   = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey;
 160                 pci_unmap_addr_set(tmad, mapping, gather_list.addr);
 161
 162                 /*
 163                  * We rely here on the fact that MLX QPs don't use the
 164                  * address handle after the send is posted (this is
 165                  * wrong following the IB spec strictly, but we know
 166                  * it's OK for our devices).
 167                  */
 168                 spin_lock_irqsave(&dev->sm_lock, flags);
 169                 wr.wr.ud.ah      = dev->sm_ah[port_num - 1];
 170                 if (wr.wr.ud.ah)
 171                         ret = ib_post_send_mad(agent, &wr, &bad_wr);
 172                 else
 173                         ret = -EINVAL;
 174                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 175
 176                 if (ret) {
 177                         dma_unmap_single(agent->device->dma_device,
 178                                          pci_unmap_addr(tmad, mapping),
 179                                          sizeof *tmad->mad,
 180                                          DMA_TO_DEVICE);
 181                         kfree(tmad->mad);
 182                         kfree(tmad);
 183                 }
 184         }
 185 }
 186
 187 int mthca_process_mad(struct ib_device *ibdev,
 188                       int mad_flags,
 189                       u8 port_num,
 190                       struct ib_wc *in_wc,
 191                       struct ib_grh *in_grh,
 192                       struct ib_mad *in_mad,
 193                       struct ib_mad *out_mad)
 194 {
 195         int err;
 196         u8 status;
 197         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 198
 199         /* Forward locally generated traps to the SM */
 200         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 201             slid == 0) {
 202                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 203                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 204         }
 205
 206         /*
 207          * Only handle SM gets, sets and trap represses for SM class
 208          *
 209          * Only handle PMA and Mellanox vendor-specific class gets and
 210          * sets for other classes.
 211          */
 212         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 213             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 214                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 215                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 216                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 217                         return IB_MAD_RESULT_SUCCESS;
 218
 219                 /*
 220                  * Don't process SMInfo queries or vendor-specific
 221                  * MADs -- the SMA can't handle them.
 222                  */
 223                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 224                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 225                      IB_SMP_ATTR_VENDOR_MASK))
 226                         return IB_MAD_RESULT_SUCCESS;
 227         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 228                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 229                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 230                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 231                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 232                         return IB_MAD_RESULT_SUCCESS;
 233         } else
 234                 return IB_MAD_RESULT_SUCCESS;
 235
 236         err = mthca_MAD_IFC(to_mdev(ibdev),
 237                             mad_flags & IB_MAD_IGNORE_MKEY,
 238                             mad_flags & IB_MAD_IGNORE_BKEY,
 239                             port_num, in_wc, in_grh, in_mad, out_mad,
 240                             &status);
 241         if (err) {
 242                 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
 243                 return IB_MAD_RESULT_FAILURE;
 244         }
 245         if (status == MTHCA_CMD_STAT_BAD_PKT)
 246                 return IB_MAD_RESULT_SUCCESS;
 247         if (status) {
 248                 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
 249                           status);
 250                 return IB_MAD_RESULT_FAILURE;
 251         }
 252
 253         if (!out_mad->mad_hdr.status)
 254                 smp_snoop(ibdev, port_num, in_mad);
 255
 256         /* set return bit in status of directed route responses */
 257         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 258                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 259
 260         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 261                 /* no response for trap repress */
 262                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 263
 264         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 265 }
 266
 267 static void send_handler(struct ib_mad_agent *agent,
 268                          struct ib_mad_send_wc *mad_send_wc)
 269 {
 270         struct mthca_trap_mad *tmad =
 271                 (void *) (unsigned long) mad_send_wc->wr_id;
 272
 273         dma_unmap_single(agent->device->dma_device,
 274                          pci_unmap_addr(tmad, mapping),
 275                          sizeof *tmad->mad,
 276                          DMA_TO_DEVICE);
 277         kfree(tmad->mad);
 278         kfree(tmad);
 279 }
 280
 281 int mthca_create_agents(struct mthca_dev *dev)
 282 {
 283         struct ib_mad_agent *agent;
 284         int p, q;
 285
 286         spin_lock_init(&dev->sm_lock);
 287
 288         for (p = 0; p < dev->limits.num_ports; ++p)
 289                 for (q = 0; q <= 1; ++q) {
 290                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 291                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 292                                                       NULL, 0, send_handler,
 293                                                       NULL, NULL);
 294                         if (IS_ERR(agent))
 295                                 goto err;
 296                         dev->send_agent[p][q] = agent;
 297                 }
 298
 299         return 0;
 300
 301 err:
 302         for (p = 0; p < dev->limits.num_ports; ++p)
 303                 for (q = 0; q <= 1; ++q)
 304                         if (dev->send_agent[p][q])
 305                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 306
 307         return PTR_ERR(agent);
 308 }
 309
 310 void mthca_free_agents(struct mthca_dev *dev)
 311 {
 312         struct ib_mad_agent *agent;
 313         int p, q;
 314
 315         for (p = 0; p < dev->limits.num_ports; ++p) {
 316                 for (q = 0; q <= 1; ++q) {
 317                         agent = dev->send_agent[p][q];
 318                         dev->send_agent[p][q] = NULL;
 319                         ib_unregister_mad_agent(agent);
 320                 }
 321
 322                 if (dev->sm_ah[p])
 323                         ib_destroy_ah(dev->sm_ah[p]);
 324         }
 325 }