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
  35 #include <linux/string.h>
  36 #include <linux/slab.h>
  37
  38 #include <rdma/ib_verbs.h>
  39 #include <rdma/ib_mad.h>
  40 #include <rdma/ib_smi.h>
  41
  42 #include "mthca_dev.h"
  43 #include "mthca_cmd.h"
  44
  45 enum {
  46         MTHCA_VENDOR_CLASS1 = 0x9,
  47         MTHCA_VENDOR_CLASS2 = 0xa
  48 };
  49
  50 static int mthca_update_rate(struct mthca_dev *dev, u8 port_num)
  51 {
  52         struct ib_port_attr *tprops = NULL;
  53         int                  ret;
  54
  55         tprops = kmalloc(sizeof *tprops, GFP_KERNEL);
  56         if (!tprops)
  57                 return -ENOMEM;
  58
  59         ret = ib_query_port(&dev->ib_dev, port_num, tprops);
  60         if (ret) {
  61                 printk(KERN_WARNING "ib_query_port failed (%d) for %s port %d\n",
  62                        ret, dev->ib_dev.name, port_num);
  63                 goto out;
  64         }
  65
  66         dev->rate[port_num - 1] = tprops->active_speed *
  67                                   ib_width_enum_to_int(tprops->active_width);
  68
  69 out:
  70         kfree(tprops);
  71         return ret;
  72 }
  73
  74 static void update_sm_ah(struct mthca_dev *dev,
  75                          u8 port_num, u16 lid, u8 sl)
  76 {
  77         struct ib_ah *new_ah;
  78         struct ib_ah_attr ah_attr;
  79         unsigned long flags;
  80
  81         if (!dev->send_agent[port_num - 1][0])
  82                 return;
  83
  84         memset(&ah_attr, 0, sizeof ah_attr);
  85         ah_attr.dlid     = lid;
  86         ah_attr.sl       = sl;
  87         ah_attr.port_num = port_num;
  88
  89         new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  90                               &ah_attr);
  91         if (IS_ERR(new_ah))
  92                 return;
  93
  94         spin_lock_irqsave(&dev->sm_lock, flags);
  95         if (dev->sm_ah[port_num - 1])
  96                 ib_destroy_ah(dev->sm_ah[port_num - 1]);
  97         dev->sm_ah[port_num - 1] = new_ah;
  98         spin_unlock_irqrestore(&dev->sm_lock, flags);
  99 }
 100
 101 /*
 102  * Snoop SM MADs for port info and P_Key table sets, so we can
 103  * synthesize LID change and P_Key change events.
 104  */
 105 static void smp_snoop(struct ib_device *ibdev,
 106                       u8 port_num,
 107                       struct ib_mad *mad)
 108 {
 109         struct ib_event event;
 110
 111         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 112              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 113             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 114                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 115                         struct ib_port_info *pinfo =
 116                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 117
 118                         mthca_update_rate(to_mdev(ibdev), port_num);
 119                         update_sm_ah(to_mdev(ibdev), port_num,
 120                                      be16_to_cpu(pinfo->sm_lid),
 121                                      pinfo->neighbormtu_mastersmsl & 0xf);
 122
 123                         event.device           = ibdev;
 124                         event.element.port_num = port_num;
 125
 126                         if (pinfo->clientrereg_resv_subnetto & 0x80)
 127                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 128                         else
 129                                 event.event    = IB_EVENT_LID_CHANGE;
 130
 131                         ib_dispatch_event(&event);
 132                 }
 133
 134                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 135                         event.device           = ibdev;
 136                         event.event            = IB_EVENT_PKEY_CHANGE;
 137                         event.element.port_num = port_num;
 138                         ib_dispatch_event(&event);
 139                 }
 140         }
 141 }
 142
 143 static void node_desc_override(struct ib_device *dev,
 144                                struct ib_mad *mad)
 145 {
 146         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 147              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 148             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 149             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 150                 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 151                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 152                 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 153         }
 154 }
 155
 156 static void forward_trap(struct mthca_dev *dev,
 157                          u8 port_num,
 158                          struct ib_mad *mad)
 159 {
 160         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 161         struct ib_mad_send_buf *send_buf;
 162         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 163         int ret;
 164         unsigned long flags;
 165
 166         if (agent) {
 167                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 168                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 169                 /*
 170                  * We rely here on the fact that MLX QPs don't use the
 171                  * address handle after the send is posted (this is
 172                  * wrong following the IB spec strictly, but we know
 173                  * it's OK for our devices).
 174                  */
 175                 spin_lock_irqsave(&dev->sm_lock, flags);
 176                 memcpy(send_buf->mad, mad, sizeof *mad);
 177                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 178                         ret = ib_post_send_mad(send_buf, NULL);
 179                 else
 180                         ret = -EINVAL;
 181                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 182
 183                 if (ret)
 184                         ib_free_send_mad(send_buf);
 185         }
 186 }
 187
 188 int mthca_process_mad(struct ib_device *ibdev,
 189                       int mad_flags,
 190                       u8 port_num,
 191                       struct ib_wc *in_wc,
 192                       struct ib_grh *in_grh,
 193                       struct ib_mad *in_mad,
 194                       struct ib_mad *out_mad)
 195 {
 196         int err;
 197         u8 status;
 198         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 199
 200         /* Forward locally generated traps to the SM */
 201         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 202             slid == 0) {
 203                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 204                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 205         }
 206
 207         /*
 208          * Only handle SM gets, sets and trap represses for SM class
 209          *
 210          * Only handle PMA and Mellanox vendor-specific class gets and
 211          * sets for other classes.
 212          */
 213         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 214             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 215                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 216                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 217                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 218                         return IB_MAD_RESULT_SUCCESS;
 219
 220                 /*
 221                  * Don't process SMInfo queries or vendor-specific
 222                  * MADs -- the SMA can't handle them.
 223                  */
 224                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 225                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 226                      IB_SMP_ATTR_VENDOR_MASK))
 227                         return IB_MAD_RESULT_SUCCESS;
 228         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 229                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 230                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 231                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 232                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 233                         return IB_MAD_RESULT_SUCCESS;
 234         } else
 235                 return IB_MAD_RESULT_SUCCESS;
 236
 237         err = mthca_MAD_IFC(to_mdev(ibdev),
 238                             mad_flags & IB_MAD_IGNORE_MKEY,
 239                             mad_flags & IB_MAD_IGNORE_BKEY,
 240                             port_num, in_wc, in_grh, in_mad, out_mad,
 241                             &status);
 242         if (err) {
 243                 mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
 244                 return IB_MAD_RESULT_FAILURE;
 245         }
 246         if (status == MTHCA_CMD_STAT_BAD_PKT)
 247                 return IB_MAD_RESULT_SUCCESS;
 248         if (status) {
 249                 mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
 250                           status);
 251                 return IB_MAD_RESULT_FAILURE;
 252         }
 253
 254         if (!out_mad->mad_hdr.status) {
 255                 smp_snoop(ibdev, port_num, in_mad);
 256                 node_desc_override(ibdev, out_mad);
 257         }
 258
 259         /* set return bit in status of directed route responses */
 260         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 261                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 262
 263         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 264                 /* no response for trap repress */
 265                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 266
 267         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 268 }
 269
 270 static void send_handler(struct ib_mad_agent *agent,
 271                          struct ib_mad_send_wc *mad_send_wc)
 272 {
 273         ib_free_send_mad(mad_send_wc->send_buf);
 274 }
 275
 276 int mthca_create_agents(struct mthca_dev *dev)
 277 {
 278         struct ib_mad_agent *agent;
 279         int p, q;
 280         int ret;
 281
 282         spin_lock_init(&dev->sm_lock);
 283
 284         for (p = 0; p < dev->limits.num_ports; ++p)
 285                 for (q = 0; q <= 1; ++q) {
 286                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 287                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 288                                                       NULL, 0, send_handler,
 289                                                       NULL, NULL);
 290                         if (IS_ERR(agent)) {
 291                                 ret = PTR_ERR(agent);
 292                                 goto err;
 293                         }
 294                         dev->send_agent[p][q] = agent;
 295                 }
 296
 297
 298         for (p = 1; p <= dev->limits.num_ports; ++p) {
 299                 ret = mthca_update_rate(dev, p);
 300                 if (ret) {
 301                         mthca_err(dev, "Failed to obtain port %d rate."
 302                                   " aborting.\n", p);
 303                         goto err;
 304                 }
 305         }
 306
 307         return 0;
 308
 309 err:
 310         for (p = 0; p < dev->limits.num_ports; ++p)
 311                 for (q = 0; q <= 1; ++q)
 312                         if (dev->send_agent[p][q])
 313                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 314
 315         return ret;
 316 }
 317
 318 void mthca_free_agents(struct mthca_dev *dev)
 319 {
 320         struct ib_mad_agent *agent;
 321         int p, q;
 322
 323         for (p = 0; p < dev->limits.num_ports; ++p) {
 324                 for (q = 0; q <= 1; ++q) {
 325                         agent = dev->send_agent[p][q];
 326                         dev->send_agent[p][q] = NULL;
 327                         ib_unregister_mad_agent(agent);
 328                 }
 329
 330                 if (dev->sm_ah[p])
 331                         ib_destroy_ah(dev->sm_ah[p]);
 332         }
 333 }