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