netdev - [PATCH net-next v2 0/2] Mitigate double allocations in ioam6

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Message-Id: <20250415112554.23823-1-justin.iurman@uliege.be>
Date: Tue, 15 Apr 2025 13:25:52 +0200
From: Justin Iurman <justin.iurman@...ege.be>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	dsahern@...nel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	justin.iurman@...ege.be
Subject: [PATCH net-next v2 0/2] Mitigate double allocations in ioam6_iptunnel

v2:
- rephrase misleading comment
- move BH disable/enable around if condition
v1:
- https://lore.kernel.org/netdev/20250410152432.30246-1-justin.iurman@uliege.be/T/#t

Commit dce525185bc9 ("net: ipv6: ioam6_iptunnel: mitigate 2-realloc
issue") fixed the double allocation issue in ioam6_iptunnel. However,
since commit 92191dd10730 ("net: ipv6: fix dst ref loops in rpl, seg6
and ioam6 lwtunnels"), the fix was left incomplete. Because the cache is
now empty when the dst_entry is the same post transformation in order to
avoid a reference loop, the double reallocation is back for such cases
(e.g., inline mode) which are valid for IOAM. This patch provides a way
to detect such cases without having a reference loop in the cache, and
so to avoid the double reallocation issue for all cases again.

Justin Iurman (2):
  net: ipv6: ioam6: use consistent dst names
  net: ipv6: ioam6: fix double reallocation

 net/ipv6/ioam6_iptunnel.c | 76 +++++++++++++++++++++++++++------------
 1 file changed, 54 insertions(+), 22 deletions(-)

-- 
2.34.1