bpf: make tcp_tso_autosize() available to BPF congestion controls

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Expose tcp_tso_autosize() as a BPF kfunc and register it in the TCP
congestion-control kfunc set. This allows BPF congestion controls to
reuse the kernel TSO autosizing logic while applying their own
minimum TSO segment policy.

To make the kfunc robust against BPF-provided inputs, min_tso_segs is
sanitized to at least 1 and mss_now == 0 returns the sanitized minimum
value instead of performing autosizing.

Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Chia-Yu Chang 2026-08-31 18:52:30 +02:00 • committed by Jakub Kicinski

parent cb145191e9

commit f69a094441

2 changed files with 12 additions and 3 deletions

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1

net/ipv4/bpf_tcp_ca.c

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14

net/ipv4/tcp_output.c

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