Merge branch 'net-prepare-skb-extensions-for-reuse-across-scrubs'

Browse source

Jakub Sitnicki says:

====================
net: Prepare skb extensions for reuse across scrubs

Following Florian's suggestion from the discussion in [1].

The skb extension allocator retains the extension's offset after the
extension is deleted. This, in theory, allows skb_ext_add() to reuse the
existing storage instead of appending another copy when an extension is
added again.  However, it also means that we can't rely on the offset as an
indicator that the extension is present.

Make the extension cleanup safe, even when the offset is already allocated
and set, by making the individual extension put helpers idempotent, so that
they can be called multiple times.

This is preparatory work to support skb extension chunk area reuse after
skb scrubbing, which would be needed to persist BPF metadata skb extension
across scrubs [2].

[1] https://lore.kernel.org/ao9UV9S7rUkyQ8jv@strlen.de
[2] https://lore.kernel.org/64365932-c765-472e-bf6c-b07c9ee25eaf@kernel.org
====================

Link: https://patch.msgid.link/20260831-skb-ext-prep-work-v1-0-ecc2a8542fd9@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Jakub Kicinski 2026-09-01 17:11:28 -07:00

parent c8ea08ba34 dbe45b209e

commit 0a1071aa32

1 changed files with 21 additions and 9 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

32

net/core/skbuff.c

View file