Differential D7415

tcp/lro: If timestamps mismatch or it's a FIN, force flush.
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Authored by sepherosa_gmail.com on Aug 4 2016, 8:50 AM.

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Reviewers

gallatin
hiren
• hselasky
np
rrs
glebius
bz

Group Reviewers

Commits

rS303766: tcp/lro: If timestamps mismatch or it's a FIN, force flush.

Summary

This keeps the segments/ACK/FIN delivery order.

Before this patch, it was observed: if A sent FIN immediately after
an ACK, B would deliver FIN first to the TCP stack, then the ACK.
This out-of-order delivery causes one unnecessary ACK sent from B.

Obtained from:  gallatin, rrs

Diff Detail

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rS FreeBSD src repository - subversion

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sepherosa_gmail.com updated this revision to Diff 19031.Aug 4 2016, 8:50 AM

sepherosa_gmail.com retitled this revision from to tcp/lro: If timestamps mismatch or it's a FIN, force flush..

sepherosa_gmail.com updated this object.

sepherosa_gmail.com edited the test plan for this revision. (Show Details)

sepherosa_gmail.com added reviewers: rrs, gallatin, • hselasky, np, glebius.

sepherosa_gmail.com added a subscriber: freebsd-net-list.

Herald added a reviewer: transport. · View Herald TranscriptAug 4 2016, 8:50 AM

sepherosa_gmail.com added reviewers: hiren, bz.Aug 4 2016, 8:54 AM

• hselasky added inline comments.Aug 4 2016, 9:07 AM

sys/netinet/tcp_lro.c
852 ↗	(On Diff #19031)	Should there be added: if (force_flush) return (TCP_LRO_CANNOT); If no match is found in the list?

sepherosa_gmail.com added inline comments.Aug 4 2016, 9:19 AM

sys/netinet/tcp_lro.c
852 ↗	(On Diff #19031)	Ah, yeah, it was in the original patch from rrs, got lost by me :P

Don't create entry for segments cant be further aggregated/delayed. Noticed-by: hps

Herald edited edge metadata. · View Herald TranscriptAug 4 2016, 9:26 AM

Looks good to me.

--HPS

gallatin accepted this revision.Aug 4 2016, 12:20 PM

gallatin edited edge metadata.

Closed by commit rS303766: tcp/lro: If timestamps mismatch or it's a FIN, force flush. (authored by sephe). · Explain WhyAug 5 2016, 9:08 AM

This revision was automatically updated to reflect the committed changes.

Revision Contents
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Path

Size

head/

sys/

netinet/

36 lines

Diff 19063

head/sys/netinet/tcp_lro.c

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