ofproto-dpif: MPLS recirculation

In some cases an pop MPLS action changes a packet to be a non-mpls packet.
In this case subsequent any L3+ actions require access to portions
of the packet which were not decoded as they were opaque when the
packet was MPLS. Allow such actions to be translated by
first recirculating the packet.

Co-authored-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
ofp-actions: Allow pop_mpls on MPLS packets

With recirculation in place this should be safe.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
ofproto-dpif: Add MPLS tests

Co-authored-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath: fix sparse warning in function tbl_mask_array_delete_mask()

Sparse gives "incompatible types in comparison expression (different
address spaces)" warning messages. Fix this by add rcu_dereference()
wrappers.

Reported-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
dpif-netdev: delete lost packets in dp_execute_cb()

This commit fixes memory leaks in dp_execute_cb() in two cases:
    - when the output port cannot be found
    - when the recirculation depth is exceeded

Reported-by: Pravin Shelar <pshelar@nicira.com>
Signed-off-by: Daniele Di Proietto <ddiproietto@vmware.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>