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mad.c

/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <rdma/ib_mad.h>
#include <rdma/ib_smi.h>

#include <linux/mlx4/cmd.h>

#include "mlx4_ib.h"

enum {
      MLX4_IB_VENDOR_CLASS1 = 0x9,
      MLX4_IB_VENDOR_CLASS2 = 0xa
};

int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int ignore_mkey, int ignore_bkey,
             int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
             void *in_mad, void *response_mad)
{
      struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
      void *inbox;
      int err;
      u32 in_modifier = port;
      u8 op_modifier = 0;

      inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
      if (IS_ERR(inmailbox))
            return PTR_ERR(inmailbox);
      inbox = inmailbox->buf;

      outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
      if (IS_ERR(outmailbox)) {
            mlx4_free_cmd_mailbox(dev->dev, inmailbox);
            return PTR_ERR(outmailbox);
      }

      memcpy(inbox, in_mad, 256);

      /*
       * Key check traps can't be generated unless we have in_wc to
       * tell us where to send the trap.
       */
      if (ignore_mkey || !in_wc)
            op_modifier |= 0x1;
      if (ignore_bkey || !in_wc)
            op_modifier |= 0x2;

      if (in_wc) {
            struct {
                  __be32            my_qpn;
                  u32         reserved1;
                  __be32            rqpn;
                  u8          sl;
                  u8          g_path;
                  u16         reserved2[2];
                  __be16            pkey;
                  u32         reserved3[11];
                  u8          grh[40];
            } *ext_info;

            memset(inbox + 256, 0, 256);
            ext_info = inbox + 256;

            ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
            ext_info->rqpn   = cpu_to_be32(in_wc->src_qp);
            ext_info->sl     = in_wc->sl << 4;
            ext_info->g_path = in_wc->dlid_path_bits |
                  (in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
            ext_info->pkey   = cpu_to_be16(in_wc->pkey_index);

            if (in_grh)
                  memcpy(ext_info->grh, in_grh, 40);

            op_modifier |= 0x4;

            in_modifier |= in_wc->slid << 16;
      }

      err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma,
                     in_modifier, op_modifier,
                     MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C);

      if (!err)
            memcpy(response_mad, outmailbox->buf, 256);

      mlx4_free_cmd_mailbox(dev->dev, inmailbox);
      mlx4_free_cmd_mailbox(dev->dev, outmailbox);

      return err;
}

static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
{
      struct ib_ah *new_ah;
      struct ib_ah_attr ah_attr;

      if (!dev->send_agent[port_num - 1][0])
            return;

      memset(&ah_attr, 0, sizeof ah_attr);
      ah_attr.dlid     = lid;
      ah_attr.sl       = sl;
      ah_attr.port_num = port_num;

      new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
                        &ah_attr);
      if (IS_ERR(new_ah))
            return;

      spin_lock(&dev->sm_lock);
      if (dev->sm_ah[port_num - 1])
            ib_destroy_ah(dev->sm_ah[port_num - 1]);
      dev->sm_ah[port_num - 1] = new_ah;
      spin_unlock(&dev->sm_lock);
}

/*
 * Snoop SM MADs for port info and P_Key table sets, so we can
 * synthesize LID change and P_Key change events.
 */
static void smp_snoop(struct ib_device *ibdev, u8 port_num, struct ib_mad *mad)
{
      struct ib_event event;

      if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
           mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
          mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
            if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO) {
                  struct ib_port_info *pinfo =
                        (struct ib_port_info *) ((struct ib_smp *) mad)->data;

                  update_sm_ah(to_mdev(ibdev), port_num,
                             be16_to_cpu(pinfo->sm_lid),
                             pinfo->neighbormtu_mastersmsl & 0xf);

                  event.device             = ibdev;
                  event.element.port_num = port_num;

                  if(pinfo->clientrereg_resv_subnetto & 0x80)
                        event.event    = IB_EVENT_CLIENT_REREGISTER;
                  else
                        event.event    = IB_EVENT_LID_CHANGE;

                  ib_dispatch_event(&event);
            }

            if (mad->mad_hdr.attr_id == IB_SMP_ATTR_PKEY_TABLE) {
                  event.device             = ibdev;
                  event.event        = IB_EVENT_PKEY_CHANGE;
                  event.element.port_num = port_num;
                  ib_dispatch_event(&event);
            }
      }
}

static void node_desc_override(struct ib_device *dev,
                         struct ib_mad *mad)
{
      if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
           mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
          mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
          mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
            spin_lock(&to_mdev(dev)->sm_lock);
            memcpy(((struct ib_smp *) mad)->data, dev->node_desc, 64);
            spin_unlock(&to_mdev(dev)->sm_lock);
      }
}

static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, struct ib_mad *mad)
{
      int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
      struct ib_mad_send_buf *send_buf;
      struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
      int ret;

      if (agent) {
            send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
                                    IB_MGMT_MAD_DATA, GFP_ATOMIC);
            /*
             * We rely here on the fact that MLX QPs don't use the
             * address handle after the send is posted (this is
             * wrong following the IB spec strictly, but we know
             * it's OK for our devices).
             */
            spin_lock(&dev->sm_lock);
            memcpy(send_buf->mad, mad, sizeof *mad);
            if ((send_buf->ah = dev->sm_ah[port_num - 1]))
                  ret = ib_post_send_mad(send_buf, NULL);
            else
                  ret = -EINVAL;
            spin_unlock(&dev->sm_lock);

            if (ret)
                  ib_free_send_mad(send_buf);
      }
}

int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags,   u8 port_num,
                  struct ib_wc *in_wc, struct ib_grh *in_grh,
                  struct ib_mad *in_mad, struct ib_mad *out_mad)
{
      u16 slid;
      int err;

      slid = in_wc ? in_wc->slid : be16_to_cpu(IB_LID_PERMISSIVE);

      if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
            forward_trap(to_mdev(ibdev), port_num, in_mad);
            return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
      }

      if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
          in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
            if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
                in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
                in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
                  return IB_MAD_RESULT_SUCCESS;

            /*
             * Don't process SMInfo queries or vendor-specific
             * MADs -- the SMA can't handle them.
             */
            if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO ||
                ((in_mad->mad_hdr.attr_id & IB_SMP_ATTR_VENDOR_MASK) ==
                 IB_SMP_ATTR_VENDOR_MASK))
                  return IB_MAD_RESULT_SUCCESS;
      } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
               in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
               in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2) {
            if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
                in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
                  return IB_MAD_RESULT_SUCCESS;
      } else
            return IB_MAD_RESULT_SUCCESS;

      err = mlx4_MAD_IFC(to_mdev(ibdev),
                     mad_flags & IB_MAD_IGNORE_MKEY,
                     mad_flags & IB_MAD_IGNORE_BKEY,
                     port_num, in_wc, in_grh, in_mad, out_mad);
      if (err)
            return IB_MAD_RESULT_FAILURE;

      if (!out_mad->mad_hdr.status) {
            smp_snoop(ibdev, port_num, in_mad);
            node_desc_override(ibdev, out_mad);
      }

      /* set return bit in status of directed route responses */
      if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
            out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);

      if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
            /* no response for trap repress */
            return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;

      return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}

static void send_handler(struct ib_mad_agent *agent,
                   struct ib_mad_send_wc *mad_send_wc)
{
      ib_free_send_mad(mad_send_wc->send_buf);
}

int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
{
      struct ib_mad_agent *agent;
      int p, q;
      int ret;

      for (p = 0; p < dev->dev->caps.num_ports; ++p)
            for (q = 0; q <= 1; ++q) {
                  agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
                                          q ? IB_QPT_GSI : IB_QPT_SMI,
                                          NULL, 0, send_handler,
                                          NULL, NULL);
                  if (IS_ERR(agent)) {
                        ret = PTR_ERR(agent);
                        goto err;
                  }
                  dev->send_agent[p][q] = agent;
            }

      return 0;

err:
      for (p = 0; p < dev->dev->caps.num_ports; ++p)
            for (q = 0; q <= 1; ++q)
                  if (dev->send_agent[p][q])
                        ib_unregister_mad_agent(dev->send_agent[p][q]);

      return ret;
}

void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
{
      struct ib_mad_agent *agent;
      int p, q;

      for (p = 0; p < dev->dev->caps.num_ports; ++p) {
            for (q = 0; q <= 1; ++q) {
                  agent = dev->send_agent[p][q];
                  dev->send_agent[p][q] = NULL;
                  ib_unregister_mad_agent(agent);
            }

            if (dev->sm_ah[p])
                  ib_destroy_ah(dev->sm_ah[p]);
      }
}

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