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IB/cm: Fix stale connection detection 

The ib_cm can incorrectly detect a stale connection (a new connection
request for a QPN that is already connected) as a duplicate connection
request.  Separate the handling of potential duplicate REQs from stale
connections.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Sean Hefty 2007-05-21 17:38:02 -07:00 committed by Roland Dreier
parent ec56dc0b7f
commit d998ccce02
1 changed files with 14 additions and 11 deletions
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25
drivers/infiniband/core/cm.c
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@ -1297,26 +1297,29 @@ static struct cm_id_private * cm_match_req(struct cm_work *work,
req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
/* Check for duplicate REQ and stale connections. */
/* Check for possible duplicate REQ. */
spin_lock_irqsave(&cm.lock, flags);
timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
if (!timewait_info)
timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
if (timewait_info) {
cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
timewait_info->work.remote_id);
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irqrestore(&cm.lock, flags);
if (cur_cm_id_priv) {
cm_dup_req_handler(work, cur_cm_id_priv);
cm_deref_id(cur_cm_id_priv);
} else
cm_issue_rej(work->port, work->mad_recv_wc,
IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
NULL, 0);
listen_cm_id_priv = NULL;
goto out;
}
return NULL;
}
/* Check for stale connections. */
timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
if (timewait_info) {
cm_cleanup_timewait(cm_id_priv->timewait_info);
spin_unlock_irqrestore(&cm.lock, flags);
cm_issue_rej(work->port, work->mad_recv_wc,
IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
NULL, 0);
return NULL;
}
/* Find matching listen request. */