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Differential D5239

Fix comparison function in LRO
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Authored by • hselasky on Feb 10 2016, 7:59 AM.
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gallatin
gnn
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transport
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rS295506: Use a pair of ifs when comparing the 32-bit flowid integers so that
Summary

When comparing 32-bit signed integers we need either to use a 64-bit variable, or check the two cases that can happen. Else we risk incorrect sorting results.

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rS FreeBSD src repository - subversion
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Event Timeline

• hselasky updated this revision to Diff 13170.Feb 10 2016, 7:59 AM
• hselasky retitled this revision from to Fix comparison function in LRO.
• hselasky updated this object.
• hselasky edited the test plan for this revision. (Show Details)
• hselasky added reviewers: gallatin, gnn.
• hselasky set the repository for this revision to rS FreeBSD src repository - subversion.
Herald added a reviewer: transport. · View Herald TranscriptFeb 10 2016, 7:59 AM
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• hselasky added a comment.Feb 10 2016, 7:59 AM

Please accept.

gallatin added inline comments.Feb 10 2016, 1:51 PM
sys/netinet/tcp_lro.c
352 ↗(On Diff #13170)

This seems like an overly complicated way to say "return 1" and "return -1". Perhaps you could simplify it, and eliminate the gotos ?

• hselasky added inline comments.Feb 10 2016, 1:55 PM
sys/netinet/tcp_lro.c
352 ↗(On Diff #13170)

It produces the least assembly code vs ret = 1 ... ret = -1. Another alternative is to mask away the 31st bit of the flowid.

gnn requested changes to this revision.Feb 10 2016, 2:00 PM
gnn edited edge metadata.

We are programming in C and not assembler. Please make the requested change to a typically C idiom.

This revision now requires changes to proceed.Feb 10 2016, 2:00 PM
• hselasky updated this revision to Diff 13181.Feb 10 2016, 2:08 PM
• hselasky edited edge metadata.

Make C-code more easily readable.

gnn accepted this revision.Feb 10 2016, 2:10 PM
gnn edited edge metadata.

Thank you.

This revision is now accepted and ready to land.Feb 10 2016, 2:10 PM
Closed by commit rS295506: Use a pair of ifs when comparing the 32-bit flowid integers so that (authored by • hselasky). · Explain WhyFeb 11 2016, 10:04 AM
This revision was automatically updated to reflect the committed changes.

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sys/
netinet/
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Diff 13211

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head/sys/netinet/tcp_lro.c

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