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IB/cm: Store and restore ah_attr during LAP msg processing 

During CM LAP processing, ah_attr is reinitialized on receiving LAP
request. First likely during CM request processing.

ah_attr might get zero out if LAP processing fails.
Therefore, attempt to create new ah_attr for the LAP message.
If the initialization fails, continue with older ah_attr.
If the initialization passes, consider the new ah_attr by overwriting
the older one.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Parav Pandit 2018-05-14 11:11:08 +03:00 committed by Jason Gunthorpe
parent a5c57d3272
commit 0e225dcb76
1 changed files with 29 additions and 3 deletions
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32
drivers/infiniband/core/cm.c
View File

@ -452,6 +452,32 @@ static void cm_set_private_data(struct cm_id_private *cm_id_priv,
cm_id_priv->private_data_len = private_data_len;
}
static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
struct ib_grh *grh, struct cm_av *av)
{
struct rdma_ah_attr new_ah_attr;
int ret;
av->port = port;
av->pkey_index = wc->pkey_index;
/*
* av->ah_attr might be initialized based on past wc during incoming
* connect request or while sending out connect request. So initialize
* a new ah_attr on stack. If initialization fails, old ah_attr is
* used for sending any responses. If initialization is successful,
* than new ah_attr is used by overwriting old one.
*/
ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
port->port_num, wc,
grh, &new_ah_attr);
if (ret)
return ret;
memcpy(&av->ah_attr, &new_ah_attr, sizeof(new_ah_attr));
return 0;
}
static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
struct ib_grh *grh, struct cm_av *av)
{
@ -3233,9 +3259,9 @@ static int cm_lap_handler(struct cm_work *work)
goto unlock;
}
ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
work->mad_recv_wc->recv_buf.grh,
&cm_id_priv->av);
ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
work->mad_recv_wc->recv_buf.grh,
&cm_id_priv->av);
if (ret)
goto unlock;