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Differential D52296

tcp: micro-optimize SYN-cookie expansion
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Authored by tuexen on Aug 30 2025, 10:32 PM.

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rscheff
cc
peter.lei_ieee.org
nickbanks_netflix.com
lstewart
glebius

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rG5d65c9eeb805: tcp: micro-optimize SYN-cookie expansion
rG341d1aabc13e: tcp: micro-optimize SYN-cookie expansion

Summary

Only compute wscale when it is actually used.
No functional change intended.

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rG FreeBSD src repository

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tuexen created this revision.Aug 30 2025, 10:32 PM

Herald added a reviewer: transport. · View Herald TranscriptAug 30 2025, 10:32 PM

Herald added subscribers: glebius, melifaro, imp. · View Herald Transcript

tuexen requested review of this revision.Aug 30 2025, 10:32 PM

rscheff accepted this revision.Sep 1 2025, 6:42 AM

This revision is now accepted and ready to land.Sep 1 2025, 6:42 AM

glebius added inline comments.Sep 1 2025, 5:02 PM

sys/netinet/tcp_syncache.c
2327	I'd suggest to make it u_int. Negative right operand of << is undefined behavior. I know we don't got into negative here, but using unsigned operand would make it tidier.

Use u_int instead of int as the type for wscale as suggested by glebius@.

This revision now requires review to proceed.Sep 1 2025, 8:45 PM

glebius accepted this revision.Sep 1 2025, 10:13 PM

This revision is now accepted and ready to land.Sep 1 2025, 10:13 PM

Closed by commit rG341d1aabc13e: tcp: micro-optimize SYN-cookie expansion (authored by tuexen). · Explain WhySep 1 2025, 10:24 PM

This revision was automatically updated to reflect the committed changes.

tuexen added a commit: rG341d1aabc13e: tcp: micro-optimize SYN-cookie expansion.

tuexen added a commit: rG5d65c9eeb805: tcp: micro-optimize SYN-cookie expansion.Sep 8 2025, 10:02 PM

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sys/

netinet/

14 lines

Diff 161342

sys/netinet/tcp_syncache.c

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