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authorAndrew Yourtchenko <ayourtch@gmail.com>2017-03-03 13:11:30 +0000
committerJohn Lo <loj@cisco.com>2017-03-03 18:51:16 +0000
commitcc40565b6eb3136d42fd67b57e4f0e01a5970a72 (patch)
tree25c0d5301f7befbcdcf4898ec63b6c470c6cf403 /src/examples
parentdfbee41b16541b51eb8f7f4d8a831ef9407fb419 (diff)
VPP-651: Ensure sw_if_index to node mapping for L2 output path is only done via l2output_main.next_nodes
Before this commit, several output features that happen to be the last in the list of features to be executed, send the packets directly to <interfaceName>-output. To do this, they use l2_output_dispatch, which builds a list of sw_if_index to next index mappings. When interfaces are deleted and the new interfaces are created, these mappings become stale, and cause the packets being sent to wrong interface output nodes. This patch (thanks John Lo for the brilliant idea!) adds a feature node "output", whose sole purpose is dispatching the packets to the correct interface output nodes. To do that, it uses the l2output_main.next_nodes, which is already taken care of for the case of the sw_if_index reuse, so this makes the dependent features all work correctly. Since this changes the packet path, for the features that were always the last ones it has triggered a side problem of the output feat_next_node_index not being properly initalized. These two users are l2-output-classify node and the output nodes belonging to the acl-plugin. For the first one the less invasive fix is just to initialize that field. For the acl-plugin nodes, rewrite the affected part of the code to use feat_bitmap_get_next_node_index since this is essentially what the conditional in l2_output_dispatch does, and fix the compiler warnings generated. This fix was first made in stable/1701 under commit e7dcee4027854b0ad076101471afdfff67eb9011. Change-Id: I32e876ab1e1d498cf0854c19c6318dcf59a93805 Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
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