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Differential D914

Add M_FLOWID to M_COPYFLAGS
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Authored by bryanv on Oct 8 2014, 5:02 AM.
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Summary

I'm sorting through changes made in our work tree, and came across this commit
that seems just to be an oversight. Shouldn't M_FLOWID be included in M_COPYFLAGS
so that places like m_{move,dup}_pkthdr() carry over the flag in situations like
when we have to prepend a new mbuf pkthdr? The actual flowid value gets copied
over as a part of copying the pkthdr, but the corresponding flag is not set.

Or does somebody have some historical context why M_FLOWID was omitted?

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bryanv updated this revision to Diff 1912.Oct 8 2014, 5:02 AM
bryanv retitled this revision from to Add M_FLOWID to M_COPYFLAGS.
bryanv updated this object.
bryanv edited the test plan for this revision. (Show Details)
bryanv added a reviewer: network.
adrian accepted this revision.Oct 8 2014, 5:20 AM
adrian added a reviewer: adrian.
adrian added a subscriber: adrian.

Looks good to me. Good catch!

This revision is now accepted and ready to land.Oct 8 2014, 5:20 AM
bryanv closed this revision.Oct 9 2014, 4:41 AM
rpaulo added a subscriber: rpaulo.Oct 24 2014, 7:10 PM

What if the packet was encapsulated? Does the flag get copied over to the inner packet? If it does, then that's a bug because the flowid needs to be recalculated.

bryanv added a comment.Oct 30 2014, 4:41 PM
In D914#9, @rpaulo wrote:

What if the packet was encapsulated? Does the flag get copied over to the inner packet? If it does, then that's a bug because the flowid needs to be recalculated.

I think that should be up to the caller to recalculate handle that. The RSS values were being propagated over so at least we are consistent now. Our handling of flow information with regards to encapsulation isn't the greatest, and something that I plan to work on to make vxlan perform better.

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sys/sys/mbuf.h

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