[ovs-build] Canceled: openvswitch/ovs#5749 (master - b99654b)

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Wed Jan 10 17:26:09 UTC 2018

Build Update for openvswitch/ovs

Build: #5749
Status: Canceled

Duration: 0 seconds
Commit: b99654b (master)
Author: Vishal Deep Ajmera
Message: ofproto-dpif-xlate: Incorrect handling of errors in group action processing

As per OpenFlow v1.3 specification, when an action list contains a group
action a copy of the packet is passed to the group for processing by the
group. This means that if there is an error encountered during group
processing, only the copy of packet should be dropped, but subsequent
actions in the action list should be executed on the original packet.

Additionally, if the group type is "ALL", each action bucket of the group
should process a copy of the packet. If there is an error while processing
one bucket other buckets should still be processed.

Example 1:
table=0,in_port=tap0 actions=output:tap1,group:10,output:tap2

Even if any error is encountered while processing the group action, the
packet should still be forwarded to ports tap1 and tap2.

Example 2:

Even if processing the action in the second bucket fails because the
packet already has an Ethernet header, the other copy of the packet should
still be processed by the first bucket and output to port tap1.

Currently the error handling in OVS does not comply with those rules. When
any group bucket execution fails the error is recorded in the so-called
"translation context" which is global for the processing of the original
packet. Once an error is recorded, OVS skips processing subsequent buckets
and installs a drop action in the datapath even if parts of the action list
were previously processed successfully.

This patch clears the error flag after any bucket of a group is executed.
This way the error encountered in processing any bucket of the group will
not impact other actions of action-list or other buckets of the group.

Errors which are system limits to protect translation from taking too long
time or too much space are not cleared. Instead drop action is installed
for them.

Signed-off-by: Vishal Deep Ajmera <vishal.deep.ajmera at ericsson.com>
Signed-off-by: Keshav Gupta <keshav.gupta at ericsson.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>

View the changeset: https://github.com/openvswitch/ovs/compare/8979dce39f88...b99654b0ceea

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