drivers/infiniband/hw/mthca/mthca_mad.c

   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 <linux/string.h>
  38 #include <linux/slab.h>
  39
  40 #include <rdma/ib_verbs.h>
  41 #include <rdma/ib_mad.h>
  42 #include <rdma/ib_smi.h>
  43
  44 #include "mthca_dev.h"
  45 #include "mthca_cmd.h"
  46
  47 enum {
  48         MTHCA_VENDOR_CLASS1 = 0x9,
  49         MTHCA_VENDOR_CLASS2 = 0xa
  50 };
  51
  52 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
  53 {
  54         struct ib_port_attr *tprops = NULL;
  55         int                  ret;
  56
  57         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
  58         if (!tprops)
  59                 return -ENOMEM;
  60
  61         ret = ib_query_port(&dev->ib_dev, port_num, tprops);
  62         if (ret) {
  63                 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
  64                        ret, dev->ib_dev.name, port_num);
  65                 goto out;
  66         }
  67
  68         dev->rate[port_num - 1] = tprops->active_speed *
  69                                   ib_width_enum_to_int(tprops->active_width);
  70
  71 out:
  72         kfree(tprops);
  73         return ret;
  74 }
  75
  76 static void update_sm_ah(struct mthca_dev *dev,
  77                          u8 port_num, u16 lid, u8 sl)
  78 {
  79         struct ib_ah *new_ah;
  80         struct ib_ah_attr ah_attr;
  81         unsigned long flags;
  82
  83         if (!dev->send_agent[port_num - 1][0])
  84                 return;
  85
  86         memset(&ah_attr, 0, sizeof ah_attr);
  87         ah_attr.dlid     = lid;
  88         ah_attr.sl       = sl;
  89         ah_attr.port_num = port_num;
  90
  91         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  92                               &ah_attr);
  93         if (IS_ERR(new_ah))
  94                 return;
  95
  96         spin_lock_irqsave(&dev->sm_lock, flags);
  97         if (dev->sm_ah[port_num - 1])
  98                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
  99         dev->sm_ah[port_num - 1] = new_ah;
 100         spin_unlock_irqrestore(&dev->sm_lock, flags);
 101 }
 102
 103 /*
 104  * Snoop SM MADs for port info and P_Key table sets, so we can
 105  * synthesize LID change and P_Key change events.
 106  */
 107 static void smp_snoop(struct ib_device *ibdev,
 108                       u8 port_num,
 109                       struct ib_mad *mad)
 110 {
 111         struct ib_event event;
 112
 113         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 114              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 115             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 116                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 117                         struct ib_port_info *pinfo =
 118                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 119
 120                         mthca_update_rate(to_mdev(ibdev), port_num);
 121                         update_sm_ah(to_mdev(ibdev), port_num,
 122                                      be16_to_cpu(pinfo->sm_lid),
 123                                      pinfo->neighbormtu_mastersmsl & 0xf);
 124
 125                         event.device           = ibdev;
 126                         event.element.port_num = port_num;
 127
 128                         if (pinfo->clientrereg_resv_subnetto & 0x80)
 129                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 130                         else
 131                                 event.event    = IB_EVENT_LID_CHANGE;
 132
 133                         ib_dispatch_event(&event);
 134                 }
 135
 136                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 137                         event.device           = ibdev;
 138                         event.event            = IB_EVENT_PKEY_CHANGE;
 139                         event.element.port_num = port_num;
 140                         ib_dispatch_event(&event);
 141                 }
 142         }
 143 }
 144
 145 static void node_desc_override(struct ib_device *dev,
 146                                struct ib_mad *mad)
 147 {
 148         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 149              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 150             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 151             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 152                 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 153                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 154                 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 155         }
 156 }
 157
 158 static void forward_trap(struct mthca_dev *dev,
 159                          u8 port_num,
 160                          struct ib_mad *mad)
 161 {
 162         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 163         struct ib_mad_send_buf *send_buf;
 164         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 165         int ret;
 166         unsigned long flags;
 167
 168         if (agent) {
 169                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 170                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 171                 /*
 172                  * We rely here on the fact that MLX QPs don't use the
 173                  * address handle after the send is posted (this is
 174                  * wrong following the IB spec strictly, but we know
 175                  * it's OK for our devices).
 176                  */
 177                 spin_lock_irqsave(&dev->sm_lock, flags);
 178                 memcpy(send_buf->mad, mad, sizeof *mad);
 179                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 180                         ret = ib_post_send_mad(send_buf, NULL);
 181                 else
 182                         ret = -EINVAL;
 183                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 184
 185                 if (ret)
 186                         ib_free_send_mad(send_buf);
 187         }
 188 }
 189
 190 int mthca_process_mad(struct ib_device *ibdev,
 191                       int mad_flags,
 192                       u8 port_num,
 193                       struct ib_wc *in_wc,
 194                       struct ib_grh *in_grh,
 195                       struct ib_mad *in_mad,
 196                       struct ib_mad *out_mad)
 197 {
 198         int err;
 199         u8 status;
 200         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 201
 202         /* Forward locally generated traps to the SM */
 203         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 204             slid == 0) {
 205                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 206                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 207         }
 208
 209         /*
 210          * Only handle SM gets, sets and trap represses for SM class
 211          *
 212          * Only handle PMA and Mellanox vendor-specific class gets and
 213          * sets for other classes.
 214          */
 215         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 216             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 217                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 218                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 219                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 220                         return IB_MAD_RESULT_SUCCESS;
 221
 222                 /*
 223                  * Don't process SMInfo queries or vendor-specific
 224                  * MADs -- the SMA can't handle them.
 225                  */
 226                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 227                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 228                      IB_SMP_ATTR_VENDOR_MASK))
 229                         return IB_MAD_RESULT_SUCCESS;
 230         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 231                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 232                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 233                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 234                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 235                         return IB_MAD_RESULT_SUCCESS;
 236         } else
 237                 return IB_MAD_RESULT_SUCCESS;
 238
 239         err = mthca_MAD_IFC(to_mdev(ibdev),
 240                             mad_flags & IB_MAD_IGNORE_MKEY,
 241                             mad_flags & IB_MAD_IGNORE_BKEY,
 242                             port_num, in_wc, in_grh, in_mad, out_mad,
 243                             &status);
 244         if (err) {
 245                 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
 246                 return IB_MAD_RESULT_FAILURE;
 247         }
 248         if (status == MTHCA_CMD_STAT_BAD_PKT)
 249                 return IB_MAD_RESULT_SUCCESS;
 250         if (status) {
 251                 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
 252                           status);
 253                 return IB_MAD_RESULT_FAILURE;
 254         }
 255
 256         if (!out_mad->mad_hdr.status) {
 257                 smp_snoop(ibdev, port_num, in_mad);
 258                 node_desc_override(ibdev, out_mad);
 259         }
 260
 261         /* set return bit in status of directed route responses */
 262         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 263                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 264
 265         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 266                 /* no response for trap repress */
 267                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 268
 269         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 270 }
 271
 272 static void send_handler(struct ib_mad_agent *agent,
 273                          struct ib_mad_send_wc *mad_send_wc)
 274 {
 275         ib_free_send_mad(mad_send_wc->send_buf);
 276 }
 277
 278 int mthca_create_agents(struct mthca_dev *dev)
 279 {
 280         struct ib_mad_agent *agent;
 281         int p, q;
 282         int ret;
 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                                 ret = PTR_ERR(agent);
 294                                 goto err;
 295                         }
 296                         dev->send_agent[p][q] = agent;
 297                 }
 298
 299
 300         for (p = 1; p <= dev->limits.num_ports; ++p) {
 301                 ret = mthca_update_rate(dev, p);
 302                 if (ret) {
 303                         mthca_err(dev, "Failed to obtain port %d rate."
 304                                   " aborting.\n", p);
 305                         goto err;
 306                 }
 307         }
 308
 309         return 0;
 310
 311 err:
 312         for (p = 0; p < dev->limits.num_ports; ++p)
 313                 for (q = 0; q <= 1; ++q)
 314                         if (dev->send_agent[p][q])
 315                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 316
 317         return ret;
 318 }
 319
 320 void mthca_free_agents(struct mthca_dev *dev)
 321 {
 322         struct ib_mad_agent *agent;
 323         int p, q;
 324
 325         for (p = 0; p < dev->limits.num_ports; ++p) {
 326                 for (q = 0; q <= 1; ++q) {
 327                         agent = dev->send_agent[p][q];
 328                         dev->send_agent[p][q] = NULL;
 329                         ib_unregister_mad_agent(agent);
 330                 }
 331
 332                 if (dev->sm_ah[p])
 333                         ib_destroy_ah(dev->sm_ah[p]);
 334         }
 335 }