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Differential D31212

Fix issue with RACK/BBR when VIMAGE is enabled
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Authored by tuexen on Jul 18 2021, 10:01 AM.
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rrs
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transport
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rG9b1219b24a5a: tcp: fix RACK and BBR when using VIMAGE enabled kernel
rGa730d82378d3: tcp: fix RACK and BBR when using VIMAGE enabled kernel
Summary

CURVNET_RESTORE expands to multiple expressions. So enclose it in curly brackets when used in an if statement.

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rG FreeBSD src repository
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tuexen created this revision.Jul 18 2021, 10:01 AM
Herald added a reviewer: transport. · View Herald TranscriptJul 18 2021, 10:01 AM
Herald added a subscriber: melifaro. · View Herald Transcript
tuexen requested review of this revision.Jul 18 2021, 10:01 AM
mjg added a subscriber: mjg.Jul 18 2021, 3:40 PM

why not fix curvnet macros?

tuexen added a comment.Jul 18 2021, 4:49 PM
In D31212#702735, @mjg wrote:

why not fix curvnet macros?

Are they broken? I guess you can change them for CURVNET_RESTORE, but not for CURVNET_SET. So I guess they are done this way for consistency... But I don't know for sure, since I did not invent them...

The man page explicitly state that

if (condition)
        CURVNET_SET(vnet);

will not work, but it does not say anything regarding CURVNET_RESTORE.

rrs accepted this revision.Jul 19 2021, 6:26 PM
This revision is now accepted and ready to land.Jul 19 2021, 6:26 PM
mjg added a comment.Jul 19 2021, 9:19 PM

The need to guard their use with { } is most definitely a bug and will keep tripping people over.

Looking at the code I have to say I don't see a fix which does not induce churn. If the set/restore macros took an argument we would be set, but it's definitely not something I'm going to spend time on nor will demand someone else does.

Closed by commit rGa730d82378d3: tcp: fix RACK and BBR when using VIMAGE enabled kernel (authored by tuexen). · Explain WhyJul 19 2021, 10:33 PM
This revision was automatically updated to reflect the committed changes.
tuexen added a commit: rGa730d82378d3: tcp: fix RACK and BBR when using VIMAGE enabled kernel.
tuexen added a commit: rG9b1219b24a5a: tcp: fix RACK and BBR when using VIMAGE enabled kernel.Jul 22 2021, 9:14 AM

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sys/
netinet/
tcp_stacks/
6 lines

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sys/netinet/tcp_stacks/rack_bbr_common.c

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