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                       u16 prev_lid)
 109 {
 110         struct ib_event event;
 111
 112         if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 113              mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 114             mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 115                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 116                         struct ib_port_info *pinfo =
 117                                 (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 118                         u16 lid = be16_to_cpu(pinfo->lid);
 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                                 ib_dispatch_event(&event);
 131                         }
 132
 133                         if (prev_lid != lid) {
 134                                 event.event    = IB_EVENT_LID_CHANGE;
 135                                 ib_dispatch_event(&event);
 136                         }
 137                 }
 138
 139                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 140                         event.device           = ibdev;
 141                         event.event            = IB_EVENT_PKEY_CHANGE;
 142                         event.element.port_num = port_num;
 143                         ib_dispatch_event(&event);
 144                 }
 145         }
 146 }
 147
 148 static void node_desc_override(struct ib_device *dev,
 149                                struct ib_mad *mad)
 150 {
 151         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 152              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 153             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 154             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 155                 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 156                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 157                 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 158         }
 159 }
 160
 161 static void forward_trap(struct mthca_dev *dev,
 162                          u8 port_num,
 163                          struct ib_mad *mad)
 164 {
 165         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 166         struct ib_mad_send_buf *send_buf;
 167         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 168         int ret;
 169         unsigned long flags;
 170
 171         if (agent) {
 172                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 173                                               IB_MGMT_MAD_DATA, GFP_ATOMIC);
 174                 if (IS_ERR(send_buf))
 175                         return;
 176                 /*
 177                  * We rely here on the fact that MLX QPs don't use the
 178                  * address handle after the send is posted (this is
 179                  * wrong following the IB spec strictly, but we know
 180                  * it's OK for our devices).
 181                  */
 182                 spin_lock_irqsave(&dev->sm_lock, flags);
 183                 memcpy(send_buf->mad, mad, sizeof *mad);
 184                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 185                         ret = ib_post_send_mad(send_buf, NULL);
 186                 else
 187                         ret = -EINVAL;
 188                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 189
 190                 if (ret)
 191                         ib_free_send_mad(send_buf);
 192         }
 193 }
 194
 195 int mthca_process_mad(struct ib_device *ibdev,
 196                       int mad_flags,
 197                       u8 port_num,
 198                       struct ib_wc *in_wc,
 199                       struct ib_grh *in_grh,
 200                       struct ib_mad *in_mad,
 201                       struct ib_mad *out_mad)
 202 {
 203         int err;
 204         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 205         u16 prev_lid = 0;
 206         struct ib_port_attr pattr;
 207
 208         /* Forward locally generated traps to the SM */
 209         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 210             slid == 0) {
 211                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 212                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 213         }
 214
 215         /*
 216          * Only handle SM gets, sets and trap represses for SM class
 217          *
 218          * Only handle PMA and Mellanox vendor-specific class gets and
 219          * sets for other classes.
 220          */
 221         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 222             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 223                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 224                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 225                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 226                         return IB_MAD_RESULT_SUCCESS;
 227
 228                 /*
 229                  * Don't process SMInfo queries or vendor-specific
 230                  * MADs -- the SMA can't handle them.
 231                  */
 232                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 233                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 234                      IB_SMP_ATTR_VENDOR_MASK))
 235                         return IB_MAD_RESULT_SUCCESS;
 236         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 237                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 238                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 239                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 240                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 241                         return IB_MAD_RESULT_SUCCESS;
 242         } else
 243                 return IB_MAD_RESULT_SUCCESS;
 244         if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 245              in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 246             in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
 247             in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 248             !ib_query_port(ibdev, port_num, &pattr))
 249                 prev_lid = pattr.lid;
 250
 251         err = mthca_MAD_IFC(to_mdev(ibdev),
 252                             mad_flags & IB_MAD_IGNORE_MKEY,
 253                             mad_flags & IB_MAD_IGNORE_BKEY,
 254                             port_num, in_wc, in_grh, in_mad, out_mad);
 255         if (err == -EBADMSG)
 256                 return IB_MAD_RESULT_SUCCESS;
 257         else if (err) {
 258                 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
 259                 return IB_MAD_RESULT_FAILURE;
 260         }
 261
 262         if (!out_mad->mad_hdr.status) {
 263                 smp_snoop(ibdev, port_num, in_mad, prev_lid);
 264                 node_desc_override(ibdev, out_mad);
 265         }
 266
 267         /* set return bit in status of directed route responses */
 268         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 269                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 270
 271         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 272                 /* no response for trap repress */
 273                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 274
 275         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 276 }
 277
 278 static void send_handler(struct ib_mad_agent *agent,
 279                          struct ib_mad_send_wc *mad_send_wc)
 280 {
 281         ib_free_send_mad(mad_send_wc->send_buf);
 282 }
 283
 284 int mthca_create_agents(struct mthca_dev *dev)
 285 {
 286         struct ib_mad_agent *agent;
 287         int p, q;
 288         int ret;
 289
 290         spin_lock_init(&dev->sm_lock);
 291
 292         for (p = 0; p < dev->limits.num_ports; ++p)
 293                 for (q = 0; q <= 1; ++q) {
 294                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 295                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 296                                                       NULL, 0, send_handler,
 297                                                       NULL, NULL, 0);
 298                         if (IS_ERR(agent)) {
 299                                 ret = PTR_ERR(agent);
 300                                 goto err;
 301                         }
 302                         dev->send_agent[p][q] = agent;
 303                 }
 304
 305
 306         for (p = 1; p <= dev->limits.num_ports; ++p) {
 307                 ret = mthca_update_rate(dev, p);
 308                 if (ret) {
 309                         mthca_err(dev, "Failed to obtain port %d rate."
 310                                   " aborting.\n", p);
 311                         goto err;
 312                 }
 313         }
 314
 315         return 0;
 316
 317 err:
 318         for (p = 0; p < dev->limits.num_ports; ++p)
 319                 for (q = 0; q <= 1; ++q)
 320                         if (dev->send_agent[p][q])
 321                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 322
 323         return ret;
 324 }
 325
 326 void mthca_free_agents(struct mthca_dev *dev)
 327 {
 328         struct ib_mad_agent *agent;
 329         int p, q;
 330
 331         for (p = 0; p < dev->limits.num_ports; ++p) {
 332                 for (q = 0; q <= 1; ++q) {
 333                         agent = dev->send_agent[p][q];
 334                         dev->send_agent[p][q] = NULL;
 335                         ib_unregister_mad_agent(agent);
 336                 }
 337
 338                 if (dev->sm_ah[p])
 339                         ib_destroy_ah(dev->sm_ah[p]);
 340         }
 341 }