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authorJohn Lo <loj@cisco.com>2016-04-23 15:14:12 -0400
committerDave Barach <openvpp@barachs.net>2016-04-25 12:58:41 +0000
commit405e41b50e336dccfdeeafae93bf4453774ecfec (patch)
tree021e77ef0458f1b2e814655d1d64a0b5b08f7613 /vnet/Makefile.am
parentd06b9f9cbf9402d66d26fc638a12b84ade197848 (diff)
Improve mechanism for using loopback interface as BVI for BDs
When loopback interface is configured as BVI, instead of changing its output node from loopN-output to l2-input, the loopN-output node is now kept while its next tx node is changed from ethernet-input to l2-input. The packet setup previously done in bvi_to_l2 as part of l2-input is now performed in the loop output node. This change adds an extra node in the BVI output path but provides the following improvements: 1. IP address/route created on loopback prior to it being configured as BVI will still work properly. The requirement to (re)configure IP/route on loopback after it is configured as BVI is removed. 2. The output stats for loopback interfaces are always provided irrespective of their BVI configuration. 3. The loopback-BVI output stats can be batch updated outside the packet loop in output node, instead of per packet update in l2-input node, making l2-input node more efficient for BVI packets. 4. Restore original node property as implemented in node.c function vlib_node_add_next_with_slot() where next node indices stored in next slots of each node will remain unique. 5. Packet trace for BVI output includes loopN output node which provides useful packet data. Change-Id: I7f5bc72ef953a367363a179088210596881f9e73 Signed-off-by: John Lo <loj@cisco.com>
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