LXR linux/drivers/infiniband/hw/mlx4/mad.c

   1/*
   2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#include <rdma/ib_mad.h>
  34#include <rdma/ib_smi.h>
  35
  36#include <linux/mlx4/cmd.h>
  37
  38#include "mlx4_ib.h"
  39
  40enum {
  41        MLX4_IB_VENDOR_CLASS1 = 0x9,
  42        MLX4_IB_VENDOR_CLASS2 = 0xa
  43};
  44
  45int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
  46                 int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
  47                 void *in_mad, void *response_mad)
  48{
  49        struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
  50        void *inbox;
  51        int err;
  52        u32 in_modifier = port;
  53        u8 op_modifier = 0;
  54
  55        inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
  56        if (IS_ERR(inmailbox))
  57                return PTR_ERR(inmailbox);
  58        inbox = inmailbox->buf;
  59
  60        outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
  61        if (IS_ERR(outmailbox)) {
  62                mlx4_free_cmd_mailbox(dev->dev, inmailbox);
  63                return PTR_ERR(outmailbox);
  64        }
  65
  66        memcpy(inbox, in_mad, 256);
  67
  68        /*
  69         * Key check traps can't be generated unless we have in_wc to
  70         * tell us where to send the trap.
  71         */
  72        if (ignore_mkey || !in_wc)
  73                op_modifier |= 0x1;
  74        if (ignore_bkey || !in_wc)
  75                op_modifier |= 0x2;
  76
  77        if (in_wc) {
  78                struct {
  79                        __be32          my_qpn;
  80                        u32             reserved1;
  81                        __be32          rqpn;
  82                        u8              sl;
  83                        u8              g_path;
  84                        u16             reserved2[2];
  85                        __be16          pkey;
  86                        u32             reserved3[11];
  87                        u8              grh[40];
  88                } *ext_info;
  89
  90                memset(inbox + 256, 0, 256);
  91                ext_info = inbox + 256;
  92
  93                ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
  94                ext_info->rqpn   = cpu_to_be32(in_wc->src_qp);
  95                ext_info->sl     = in_wc->sl << 4;
  96                ext_info->g_path = in_wc->dlid_path_bits |
  97                        (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
  98                ext_info->pkey   = cpu_to_be16(in_wc->pkey_index);
  99
 100                if (in_grh)
 101                        memcpy(ext_info->grh, in_grh, 40);
 102
 103                op_modifier |= 0x4;
 104
 105                in_modifier |= in_wc->slid << 16;
 106        }
 107
 108        err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
 109                           in_modifier, op_modifier,
 110                           MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);
 111
 112        if (!err)
 113                memcpy(response_mad, outmailbox->buf, 256);
 114
 115        mlx4_free_cmd_mailbox(dev->dev, inmailbox);
 116        mlx4_free_cmd_mailbox(dev->dev, outmailbox);
 117
 118        return err;
 119}
 120
 121static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
 122{
 123        struct ib_ah *new_ah;
 124        struct ib_ah_attr ah_attr;
 125
 126        if (!dev->send_agent[port_num - 1][0])
 127                return;
 128
 129        memset(&ah_attr, 0, sizeof ah_attr);
 130        ah_attr.dlid     = lid;
 131        ah_attr.sl       = sl;
 132        ah_attr.port_num = port_num;
 133
 134        new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
 135                              &ah_attr);
 136        if (IS_ERR(new_ah))
 137                return;
 138
 139        spin_lock(&dev->sm_lock);
 140        if (dev->sm_ah[port_num - 1])
 141                ib_destroy_ah(dev->sm_ah[port_num - 1]);
 142        dev->sm_ah[port_num - 1] = new_ah;
 143        spin_unlock(&dev->sm_lock);
 144}
 145
 146/*
 147 * Snoop SM MADs for port info and P_Key table sets, so we can
 148 * synthesize LID change and P_Key change events.
 149 */
 150static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad)
 151{
 152        struct ib_event event;
 153
 154        if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 155             mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 156            mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
 157                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
 158                        struct ib_port_info *pinfo =
 159                                (struct ib_port_info *) ((struct ib_smp *) mad)->data;
 160
 161                        update_sm_ah(to_mdev(ibdev), port_num,
 162                                     be16_to_cpu(pinfo->sm_lid),
 163                                     pinfo->neighbormtu_mastersmsl & 0xf);
 164
 165                        event.device           = ibdev;
 166                        event.element.port_num = port_num;
 167
 168                        if(pinfo->clientrereg_resv_subnetto & 0x80)
 169                                event.event    = IB_EVENT_CLIENT_REREGISTER;
 170                        else
 171                                event.event    = IB_EVENT_LID_CHANGE;
 172
 173                        ib_dispatch_event(&event);
 174                }
 175
 176                if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
 177                        event.device           = ibdev;
 178                        event.event            = IB_EVENT_PKEY_CHANGE;
 179                        event.element.port_num = port_num;
 180                        ib_dispatch_event(&event);
 181                }
 182        }
 183}
 184
 185static void node_desc_override(struct ib_device *dev,
 186                               struct ib_mad *mad)
 187{
 188        if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 189             mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
 190            mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
 191            mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
 192                spin_lock(&to_mdev(dev)->sm_lock);
 193                memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
 194                spin_unlock(&to_mdev(dev)->sm_lock);
 195        }
 196}
 197
 198static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
 199{
 200        int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
 201        struct ib_mad_send_buf *send_buf;
 202        struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
 203        int ret;
 204
 205        if (agent) {
 206                send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
 207                                              IB_MGMT_MAD_DATA, GFP_ATOMIC);
 208                /*
 209                 * We rely here on the fact that MLX QPs don't use the
 210                 * address handle after the send is posted (this is
 211                 * wrong following the IB spec strictly, but we know
 212                 * it's OK for our devices).
 213                 */
 214                spin_lock(&dev->sm_lock);
 215                memcpy(send_buf->mad, mad, sizeof *mad);
 216                if ((send_buf->ah = dev->sm_ah[port_num - 1]))
 217                        ret = ib_post_send_mad(send_buf, NULL);
 218                else
 219                        ret = -EINVAL;
 220                spin_unlock(&dev->sm_lock);
 221
 222                if (ret)
 223                        ib_free_send_mad(send_buf);
 224        }
 225}
 226
 227int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 228                        struct ib_wc *in_wc, struct ib_grh *in_grh,
 229                        struct ib_mad *in_mad, struct ib_mad *out_mad)
 230{
 231        u16 slid;
 232        int err;
 233
 234        slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);
 235
 236        if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
 237                forward_trap(to_mdev(ibdev), port_num, in_mad);
 238                return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
 239        }
 240
 241        if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
 242            in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 243                if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
 244                    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
 245                    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
 246                        return IB_MAD_RESULT_SUCCESS;
 247
 248                /*
 249                 * Don't process SMInfo queries or vendor-specific
 250                 * MADs -- the SMA can't handle them.
 251                 */
 252                if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
 253                    ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
 254                     IB_SMP_ATTR_VENDOR_MASK))
 255                        return IB_MAD_RESULT_SUCCESS;
 256        } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
 257                   in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
 258                   in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2) {
 259                if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
 260                    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
 261                        return IB_MAD_RESULT_SUCCESS;
 262        } else
 263                return IB_MAD_RESULT_SUCCESS;
 264
 265        err = mlx4_MAD_IFC(to_mdev(ibdev),
 266                           mad_flags & IB_MAD_IGNORE_MKEY,
 267                           mad_flags & IB_MAD_IGNORE_BKEY,
 268                           port_num, in_wc, in_grh, in_mad, out_mad);
 269        if (err)
 270                return IB_MAD_RESULT_FAILURE;
 271
 272        if (!out_mad->mad_hdr.status) {
 273                smp_snoop(ibdev, port_num, in_mad);
 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
 288static 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
 294int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
 295{
 296        struct ib_mad_agent *agent;
 297        int p, q;
 298        int ret;
 299
 300        for (p = 0; p < dev->dev->caps.num_ports; ++p)
 301                for (q = 0; q <= 1; ++q) {
 302                        agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
 303                                                      q ? IB_QPT_GSI : IB_QPT_SMI,
 304                                                      NULL, 0, send_handler,
 305                                                      NULL, NULL);
 306                        if (IS_ERR(agent)) {
 307                                ret = PTR_ERR(agent);
 308                                goto err;
 309                        }
 310                        dev->send_agent[p][q] = agent;
 311                }
 312
 313        return 0;
 314
 315err:
 316        for (p = 0; p < dev->dev->caps.num_ports; ++p)
 317                for (q = 0; q <= 1; ++q)
 318                        if (dev->send_agent[p][q])
 319                                ib_unregister_mad_agent(dev->send_agent[p][q]);
 320
 321        return ret;
 322}
 323
 324void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
 325{
 326        struct ib_mad_agent *agent;
 327        int p, q;
 328
 329        for (p = 0; p < dev->dev->caps.num_ports; ++p) {
 330                for (q = 0; q <= 1; ++q) {
 331                        agent = dev->send_agent[p][q];
 332                        dev->send_agent[p][q] = NULL;
 333                        ib_unregister_mad_agent(agent);
 334                }
 335
 336                if (dev->sm_ah[p])
 337                        ib_destroy_ah(dev->sm_ah[p]);
 338        }
 339}
 340