ClabureDB: Classified Bug-Reports Database

  /*
   * 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   ||
                   in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
                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->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->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->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]);
        }
}