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@@ -36,6 +36,9 @@ FILE_LICENCE ( GPL2_OR_LATER );
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*
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*/
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+/** List of connections */
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+static LIST_HEAD ( ib_cm_conns );
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+
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/**
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* Send "ready to use" response
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*
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@@ -71,6 +74,54 @@ static int ib_cm_send_rtu ( struct ib_device *ibdev,
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return 0;
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}
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+/**
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+ * Handle duplicate connection replies
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+ *
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+ * @v ibdev Infiniband device
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+ * @v mi Management interface
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+ * @v mad Received MAD
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+ * @v av Source address vector
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+ * @ret rc Return status code
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+ *
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+ * If a "ready to use" MAD is lost, the peer may resend the connection
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+ * reply. We have to respond to these with duplicate "ready to use"
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+ * MADs, otherwise the peer may time out and drop the connection.
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+ */
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+static void ib_cm_connect_rep ( struct ib_device *ibdev,
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+ struct ib_mad_interface *mi,
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+ union ib_mad *mad,
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+ struct ib_address_vector *av ) {
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+ struct ib_cm_connect_reply *connect_rep =
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+ &mad->cm.cm_data.connect_reply;
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+ struct ib_connection *conn;
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+ int rc;
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+
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+ /* Identify connection */
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+ list_for_each_entry ( conn, &ib_cm_conns, list ) {
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+ if ( ntohl ( connect_rep->remote_id ) != conn->local_id )
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+ continue;
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+ /* Try to send "ready to use" reply */
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+ if ( ( rc = ib_cm_send_rtu ( ibdev, mi, conn, av ) ) != 0 ) {
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+ /* Ignore errors */
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+ return;
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+ }
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+ return;
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+ }
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+
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+ DBG ( "CM unidentified connection %08x\n",
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+ ntohl ( connect_rep->remote_id ) );
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+}
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+
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+/** Communication management agents */
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+struct ib_mad_agent ib_cm_agent[] __ib_mad_agent = {
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+ {
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+ .mgmt_class = IB_MGMT_CLASS_CM,
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+ .class_version = IB_CM_CLASS_VERSION,
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+ .attr_id = htons ( IB_CM_ATTR_CONNECT_REPLY ),
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+ .handle = ib_cm_connect_rep,
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+ },
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+};
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+
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/**
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* Handle connection request transaction completion
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*
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@@ -296,6 +347,9 @@ ib_create_conn ( struct ib_device *ibdev, struct ib_queue_pair *qp,
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goto err_create_path;
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ib_path_set_ownerdata ( conn->path, conn );
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+ /* Add to list of connections */
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+ list_add ( &conn->list, &ib_cm_conns );
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+
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DBGC ( conn, "CM %p created for IBDEV %p QPN %lx\n",
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conn, ibdev, qp->qpn );
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DBGC ( conn, "CM %p connecting to %08x:%08x:%08x:%08x %08x:%08x\n",
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@@ -324,6 +378,7 @@ void ib_destroy_conn ( struct ib_device *ibdev,
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struct ib_queue_pair *qp __unused,
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struct ib_connection *conn ) {
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+ list_del ( &conn->list );
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if ( conn->madx )
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ib_destroy_madx ( ibdev, ibdev->gsi, conn->madx );
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if ( conn->path )
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