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                dev_warn(&dev->ib_dev.dev,
  62                         "ib_query_port failed (%d) forport %d\n", ret,
  63                         port_num);
  64                goto out;
  65        }
  66
  67        dev->rate[port_num - 1] = tprops->active_speed *
  68                                  ib_width_enum_to_int(tprops->active_width);
  69
  70out:
  71        kfree(tprops);
  72        return ret;
  73}
  74
  75static void update_sm_ah(struct mthca_dev *dev,
  76                         u8 port_num, u16 lid, u8 sl)
  77{
  78        struct ib_ah *new_ah;
  79        struct rdma_ah_attr ah_attr;
  80        unsigned long flags;
  81
  82        if (!dev->send_agent[port_num - 1][0])
  83                return;
  84
  85        memset(&ah_attr, 0, sizeof ah_attr);
  86        ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
  87        rdma_ah_set_dlid(&ah_attr, lid);
  88        rdma_ah_set_sl(&ah_attr, sl);
  89        rdma_ah_set_port_num(&ah_attr, port_num);
  90
  91        new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
  92                                &ah_attr, 0);
  93        if (IS_ERR(new_ah))
  94                return;
  95
  96        spin_lock_irqsave(&dev->sm_lock, flags);
  97        if (dev->sm_ah[port_num - 1])
  98                rdma_destroy_ah(dev->sm_ah[port_num - 1], 0);
  99        dev->sm_ah[port_num - 1] = new_ah;
 100        spin_unlock_irqrestore(&dev->sm_lock, flags);
 101}
 102
 103/*
 104 * Snoop SM MADs for port info and P_Key table sets, so we can
 105 * synthesize LID change and P_Key change events.
 106 */
 107static void smp_snoop(struct ib_device *ibdev,
 108                      u8 port_num,
 109                      const struct ib_mad *mad,
 110                      u16 prev_lid)
 111{
 112        struct ib_event event;
 113
 114        if ((mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 115             mad->mad_hdr.mgmt_class  == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 116            mad->mad_hdr.method     == IB_MGMT_METHOD_SET) {
 117                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 118                        struct ib_port_info *pinfo =
 119                                (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 120                        u16 lid = be16_to_cpu(pinfo->lid);
 121
 122                        mthca_update_rate(to_mdev(ibdev), port_num);
 123                        update_sm_ah(to_mdev(ibdev), port_num,
 124                                     be16_to_cpu(pinfo->sm_lid),
 125                                     pinfo->neighbormtu_mastersmsl & 0xf);
 126
 127                        event.device           = ibdev;
 128                        event.element.port_num = port_num;
 129
 130                        if (pinfo->clientrereg_resv_subnetto & 0x80) {
 131                                event.event    = IB_EVENT_CLIENT_REREGISTER;
 132                                ib_dispatch_event(&event);
 133                        }
 134
 135                        if (prev_lid != lid) {
 136                                event.event    = IB_EVENT_LID_CHANGE;
 137                                ib_dispatch_event(&event);
 138                        }
 139                }
 140
 141                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 142                        event.device           = ibdev;
 143                        event.event            = IB_EVENT_PKEY_CHANGE;
 144                        event.element.port_num = port_num;
 145                        ib_dispatch_event(&event);
 146                }
 147        }
 148}
 149
 150static void node_desc_override(struct ib_device *dev,
 151                               struct ib_mad *mad)
 152{
 153        if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 154             mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 155            mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 156            mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 157                mutex_lock(&to_mdev(dev)->cap_mask_mutex);
 158                memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
 159                       IB_DEVICE_NODE_DESC_MAX);
 160                mutex_unlock(&to_mdev(dev)->cap_mask_mutex);
 161        }
 162}
 163
 164static void forward_trap(struct mthca_dev *dev,
 165                         u32 port_num,
 166                         const struct ib_mad *mad)
 167{
 168        int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 169        struct ib_mad_send_buf *send_buf;
 170        struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 171        int ret;
 172        unsigned long flags;
 173
 174        if (agent) {
 175                send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 176                                              IB_MGMT_MAD_DATA, GFP_ATOMIC,
 177                                              IB_MGMT_BASE_VERSION);
 178                if (IS_ERR(send_buf))
 179                        return;
 180                /*
 181                 * We rely here on the fact that MLX QPs don't use the
 182                 * address handle after the send is posted (this is
 183                 * wrong following the IB spec strictly, but we know
 184                 * it's OK for our devices).
 185                 */
 186                spin_lock_irqsave(&dev->sm_lock, flags);
 187                memcpy(send_buf->mad, mad, sizeof *mad);
 188                if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 189                        ret = ib_post_send_mad(send_buf, NULL);
 190                else
 191                        ret = -EINVAL;
 192                spin_unlock_irqrestore(&dev->sm_lock, flags);
 193
 194                if (ret)
 195                        ib_free_send_mad(send_buf);
 196        }
 197}
 198
 199int mthca_process_mad(struct ib_device *ibdev, int mad_flags, u32 port_num,
 200                      const struct ib_wc *in_wc, const struct ib_grh *in_grh,
 201                      const struct ib_mad *in, struct ib_mad *out,
 202                      size_t *out_mad_size, u16 *out_mad_pkey_index)
 203{
 204        int err;
 205        u16 slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
 206        u16 prev_lid = 0;
 207        struct ib_port_attr pattr;
 208
 209        /* Forward locally generated traps to the SM */
 210        if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP && !slid) {
 211                forward_trap(to_mdev(ibdev), port_num, in);
 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_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 222            in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 223                if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
 224                    in->mad_hdr.method != IB_MGMT_METHOD_SET &&
 225                    in->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_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 233                    ((in->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_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 237                   in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1     ||
 238                   in->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
 239                if (in->mad_hdr.method != IB_MGMT_METHOD_GET &&
 240                    in->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_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 245             in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 246            in->mad_hdr.method == IB_MGMT_METHOD_SET &&
 247            in->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
 248            !ib_query_port(ibdev, port_num, &pattr))
 249                prev_lid = ib_lid_cpu16(pattr.lid);
 250
 251        err = mthca_MAD_IFC(to_mdev(ibdev), mad_flags & IB_MAD_IGNORE_MKEY,
 252                            mad_flags & IB_MAD_IGNORE_BKEY, port_num, in_wc,
 253                            in_grh, in, out);
 254        if (err == -EBADMSG)
 255                return IB_MAD_RESULT_SUCCESS;
 256        else if (err) {
 257                mthca_err(to_mdev(ibdev), "MAD_IFC returned %d\n", err);
 258                return IB_MAD_RESULT_FAILURE;
 259        }
 260
 261        if (!out->mad_hdr.status) {
 262                smp_snoop(ibdev, port_num, in, prev_lid);
 263                node_desc_override(ibdev, out);
 264        }
 265
 266        /* set return bit in status of directed route responses */
 267        if (in->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 268                out->mad_hdr.status |= cpu_to_be16(1 << 15);
 269
 270        if (in->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
 271                /* no response for trap repress */
 272                return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 273
 274        return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
 275}
 276
 277static void send_handler(struct ib_mad_agent *agent,
 278                         struct ib_mad_send_wc *mad_send_wc)
 279{
 280        ib_free_send_mad(mad_send_wc->send_buf);
 281}
 282
 283int mthca_create_agents(struct mthca_dev *dev)
 284{
 285        struct ib_mad_agent *agent;
 286        int p, q;
 287        int ret;
 288
 289        spin_lock_init(&dev->sm_lock);
 290
 291        for (p = 0; p < dev->limits.num_ports; ++p)
 292                for (q = 0; q <= 1; ++q) {
 293                        agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 294                                                      q ? IB_QPT_GSI : IB_QPT_SMI,
 295                                                      NULL, 0, send_handler,
 296                                                      NULL, NULL, 0);
 297                        if (IS_ERR(agent)) {
 298                                ret = PTR_ERR(agent);
 299                                goto err;
 300                        }
 301                        dev->send_agent[p][q] = agent;
 302                }
 303
 304
 305        for (p = 1; p <= dev->limits.num_ports; ++p) {
 306                ret = mthca_update_rate(dev, p);
 307                if (ret) {
 308                        mthca_err(dev, "Failed to obtain port %d rate."
 309                                  " aborting.\n", p);
 310                        goto err;
 311                }
 312        }
 313
 314        return 0;
 315
 316err:
 317        for (p = 0; p < dev->limits.num_ports; ++p)
 318                for (q = 0; q <= 1; ++q)
 319                        if (dev->send_agent[p][q])
 320                                ib_unregister_mad_agent(dev->send_agent[p][q]);
 321
 322        return ret;
 323}
 324
 325void mthca_free_agents(struct mthca_dev *dev)
 326{
 327        struct ib_mad_agent *agent;
 328        int p, q;
 329
 330        for (p = 0; p < dev->limits.num_ports; ++p) {
 331                for (q = 0; q <= 1; ++q) {
 332                        agent = dev->send_agent[p][q];
 333                        dev->send_agent[p][q] = NULL;
 334                        ib_unregister_mad_agent(agent);
 335                }
 336
 337                if (dev->sm_ah[p])
 338                        rdma_destroy_ah(dev->sm_ah[p],
 339                                        RDMA_DESTROY_AH_SLEEPABLE);
 340        }
 341}
 342