net: ipv6: seg6_iptunnel: mitigate 2-realloc issue

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[ Upstream commit 40475b6376 ]

This patch mitigates the two-reallocations issue with seg6_iptunnel by
providing the dst_entry (in the cache) to the first call to
skb_cow_head(). As a result, the very first iteration would still
trigger two reallocations (i.e., empty cache), while next iterations
would only trigger a single reallocation.

Performance tests before/after applying this patch, which clearly shows
the improvement:
- before: https://ibb.co/3Cg4sNH
- after: https://ibb.co/8rQ350r

Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
Cc: David Lebrun <dlebrun@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Stable-dep-of: 92191dd107 ("net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Justin Iurman 2024-12-03 13:49:44 +01:00 • committed by Greg Kroah-Hartman

parent 8471e22844

commit 2fcc9f3798

1 changed files with 52 additions and 33 deletions

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net/ipv6/seg6_iptunnel.c

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