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 rdma_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.type = rdma_ah_find_type(&dev->ib_dev, port_num);
  86         rdma_ah_set_dlid(&ah_attr, lid);
  87         rdma_ah_set_sl(&ah_attr, sl);
  88         rdma_ah_set_port_num(&ah_attr, port_num);
  89
  90         new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  91                                 &ah_attr);
  92         if (IS_ERR(new_ah))
  93                 return;
  94
  95         spin_lock_irqsave(&dev->sm_lock, flags);
  96         if (dev->sm_ah[port_num - 1])
  97                 rdma_destroy_ah(dev->sm_ah[port_num - 1]);
  98         dev->sm_ah[port_num - 1] = new_ah;
  99         spin_unlock_irqrestore(&dev->sm_lock, flags);
 100 }
 101
 102 /*
 103  * Snoop SM MADs for port info and P_Key table sets, so we can
 104  * synthesize LID change and P_Key change events.
 105  */
 106 static void smp_snoop(struct ib_device *ibdev,
 107                       u8 port_num,
 108                       const struct ib_mad *mad,
 109                       u16 prev_lid)
 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                         u16 lid = be16_to_cpu(pinfo->lid);
 120
 121                         mthca_update_rate(to_mdev(ibdev), port_num);
 122                         update_sm_ah(to_mdev(ibdev), port_num,
 123                                      be16_to_cpu(pinfo->sm_lid),
 124                                      pinfo->neighbormtu_mastersmsl & 0xf);
 125
 126                         event.device           = ibdev;
 127                         event.element.port_num = port_num;
 128
 129                         if (pinfo->clientrereg_resv_subnetto & 0x80) {
 130                                 event.event    = IB_EVENT_CLIENT_REREGISTER;
 131                                 ib_dispatch_event(&event);
 132                         }
 133
 134                         if (prev_lid != lid) {
 135                                 event.event    = IB_EVENT_LID_CHANGE;
 136                                 ib_dispatch_event(&event);
 137                         }
 138                 }
 139
 140                 if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 141                         event.device           = ibdev;
 142                         event.event            = IB_EVENT_PKEY_CHANGE;
 143                         event.element.port_num = port_num;
 144                         ib_dispatch_event(&event);
 145                 }
 146         }
 147 }
 148
 149 static void node_desc_override(struct ib_device *dev,
 150                                struct ib_mad *mad)
 151 {
 152         if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 153              mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 154             mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 155             mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 156                 mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 157                 memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
 158                        IB_DEVICE_NODE_DESC_MAX);
 159                 mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 160         }
 161 }
 162
 163 static void forward_trap(struct mthca_dev *dev,
 164                          u8 port_num,
 165                          const struct ib_mad *mad)
 166 {
 167         int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 168         struct ib_mad_send_buf *send_buf;
 169         struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 170         int ret;
 171         unsigned long flags;
 172
 173         if (agent) {
 174                 send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 175                                               IB_MGMT_MAD_DATA, GFP_ATOMIC,
 176                                               IB_MGMT_BASE_VERSION);
 177                 if (IS_ERR(send_buf))
 178                         return;
 179                 /*
 180                  * We rely here on the fact that MLX QPs don't use the
 181                  * address handle after the send is posted (this is
 182                  * wrong following the IB spec strictly, but we know
 183                  * it's OK for our devices).
 184                  */
 185                 spin_lock_irqsave(&dev->sm_lock, flags);
 186                 memcpy(send_buf->mad, mad, sizeof *mad);
 187                 if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 188                         ret = ib_post_send_mad(send_buf, NULL);
 189                 else
 190                         ret = -EINVAL;
 191                 spin_unlock_irqrestore(&dev->sm_lock, flags);
 192
 193                 if (ret)
 194                         ib_free_send_mad(send_buf);
 195         }
 196 }
 197
 198 int mthca_process_mad(struct ib_device *ibdev,
 199                       int mad_flags,
 200                       u8 port_num,
 201                       const struct ib_wc *in_wc,
 202                       const struct ib_grh *in_grh,
 203                       const struct ib_mad_hdr *in, size_t in_mad_size,
 204                       struct ib_mad_hdr *out, size_t *out_mad_size,
 205                       u16 *out_mad_pkey_index)
 206 {
 207         int err;
 208         u16 slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 209         u16 prev_lid = 0;
 210         struct ib_port_attr pattr;
 211         const struct ib_mad *in_mad = (const struct ib_mad *)in;
 212         struct ib_mad *out_mad = (struct ib_mad *)out;
 213
 214         if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
 215                          *out_mad_size != sizeof(*out_mad)))
 216                 return IB_MAD_RESULT_FAILURE;
 217
 218         /* Forward locally generated traps to the SM */
 219         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
 220             slid == 0) {
 221                 forward_trap(to_mdev(ibdev), port_num, in_mad);
 222                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 223         }
 224
 225         /*
 226          * Only handle SM gets, sets and trap represses for SM class
 227          *
 228          * Only handle PMA and Mellanox vendor-specific class gets and
 229          * sets for other classes.
 230          */
 231         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 232             in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 233                 if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 234                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 235                     in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 236                         return IB_MAD_RESULT_SUCCESS;
 237
 238                 /*
 239                  * Don't process SMInfo queries or vendor-specific
 240                  * MADs -- the SMA can't handle them.
 241                  */
 242                 if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 243                     ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 244                      IB_SMP_ATTR_VENDOR_MASK))
 245                         return IB_MAD_RESULT_SUCCESS;
 246         } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 247                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 248                    in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 249                 if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 250                     in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 251                         return IB_MAD_RESULT_SUCCESS;
 252         } else
 253                 return IB_MAD_RESULT_SUCCESS;
 254         if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 255              in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 256             in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
 257             in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 258             !ib_query_port(ibdev, port_num, &pattr))
 259                 prev_lid = pattr.lid;
 260
 261         err = mthca_MAD_IFC(to_mdev(ibdev),
 262                             mad_flags & IB_MAD_IGNORE_MKEY,
 263                             mad_flags & IB_MAD_IGNORE_BKEY,
 264                             port_num, in_wc, in_grh, in_mad, out_mad);
 265         if (err == -EBADMSG)
 266                 return IB_MAD_RESULT_SUCCESS;
 267         else if (err) {
 268                 mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
 269                 return IB_MAD_RESULT_FAILURE;
 270         }
 271
 272         if (!out_mad->mad_hdr.status) {
 273                 smp_snoop(ibdev, port_num, in_mad, prev_lid);
 274                 node_desc_override(ibdev, out_mad);
 275         }
 276
 277         /* set return bit in status of directed route responses */
 278         if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 279                 out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
 280
 281         if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 282                 /* no response for trap repress */
 283                 return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 284
 285         return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 286 }
 287
 288 static void send_handler(struct ib_mad_agent *agent,
 289                          struct ib_mad_send_wc *mad_send_wc)
 290 {
 291         ib_free_send_mad(mad_send_wc->send_buf);
 292 }
 293
 294 int mthca_create_agents(struct mthca_dev *dev)
 295 {
 296         struct ib_mad_agent *agent;
 297         int p, q;
 298         int ret;
 299
 300         spin_lock_init(&dev->sm_lock);
 301
 302         for (p = 0; p < dev->limits.num_ports; ++p)
 303                 for (q = 0; q <= 1; ++q) {
 304                         agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 305                                                       q ? IB_QPT_GSI : IB_QPT_SMI,
 306                                                       NULL, 0, send_handler,
 307                                                       NULL, NULL, 0);
 308                         if (IS_ERR(agent)) {
 309                                 ret = PTR_ERR(agent);
 310                                 goto err;
 311                         }
 312                         dev->send_agent[p][q] = agent;
 313                 }
 314
 315
 316         for (p = 1; p <= dev->limits.num_ports; ++p) {
 317                 ret = mthca_update_rate(dev, p);
 318                 if (ret) {
 319                         mthca_err(dev, "Failed to obtain port %d rate."
 320                                   " aborting.\n", p);
 321                         goto err;
 322                 }
 323         }
 324
 325         return 0;
 326
 327 err:
 328         for (p = 0; p < dev->limits.num_ports; ++p)
 329                 for (q = 0; q <= 1; ++q)
 330                         if (dev->send_agent[p][q])
 331                                 ib_unregister_mad_agent(dev->send_agent[p][q]);
 332
 333         return ret;
 334 }
 335
 336 void mthca_free_agents(struct mthca_dev *dev)
 337 {
 338         struct ib_mad_agent *agent;
 339         int p, q;
 340
 341         for (p = 0; p < dev->limits.num_ports; ++p) {
 342                 for (q = 0; q <= 1; ++q) {
 343                         agent = dev->send_agent[p][q];
 344                         dev->send_agent[p][q] = NULL;
 345                         ib_unregister_mad_agent(agent);
 346                 }
 347
 348                 if (dev->sm_ah[p])
 349                         rdma_destroy_ah(dev->sm_ah[p]);
 350         }
 351 }