netdev - [PATCH net-next 0/3] dst_cache: cope with device removal

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Date: Thu, 30 May 2024 19:18:08 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 0/3] dst_cache: cope with device removal

Eric reported a net device refcount leak and diagnosed the root cause
as the dst_cache not coping well with the underlying device removal.

To address such issue, this series introduces the infrastructure to let
the existing uncached list handle the relevant cleanup.

Patch 1 and 2 are preparation changes to make the uncached list infra
more flexible for the new use-case, and patch 3 addresses the issue.

---
Targeting net-next as the addressed problem is quite ancient and I fear
some unexpected side effects for patch 2.

Paolo Abeni (3):
  ipv6: use a new flag to indicate elevated refcount.
  ipv4: obsolete routes moved out of per cpu cache
  dst_cache: let rt_uncached cope with dst_cache cleanup

 include/net/ip6_fib.h | 3 +++
 net/core/dst_cache.c  | 8 ++++++++
 net/ipv4/route.c      | 2 +-
 net/ipv6/route.c      | 4 ++--
 4 files changed, 14 insertions(+), 3 deletions(-)

-- 
2.43.2