LXR linux/drivers/infiniband/hw/mthca/mthca

   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
  45enum {
  46        MTHCA_VENDOR_CLASS1 = 0x9,
  47        MTHCA_VENDOR_CLASS2 = 0xa
  48};
  49
  50static 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
  69out:
  70        kfree(tprops);
  71        return ret;
  72}
  73
  74static 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 */
 105static 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
 148static 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
 161static 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
 195int 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
 278static 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
 284int 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);
 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
 317err:
 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
 326void 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}
 342