netdev - Re: [PATCH net-next 14/14] ipv6: lockless IPV6_FLOWINFO

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Message-ID: <823f7b14-864f-6d60-99f7-e22c64e16488@kernel.org>
Date: Thu, 14 Sep 2023 09:11:11 -0600
From: David Ahern <dsahern@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 14/14] ipv6: lockless IPV6_FLOWINFO_SEND
 implementation

On 9/12/23 10:02 AM, Eric Dumazet wrote:
> np->sndflow reads are racy.
> 
> Use one bit ftom atomic inet->inet_flags instead,
> IPV6_FLOWINFO_SEND setsockopt() can be lockless.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  include/linux/ipv6.h     |  3 +--
>  include/net/inet_sock.h  |  1 +
>  net/dccp/ipv6.c          |  2 +-
>  net/ipv4/ping.c          |  3 +--
>  net/ipv6/af_inet6.c      |  2 +-
>  net/ipv6/datagram.c      |  7 ++++---
>  net/ipv6/ipv6_sockglue.c | 13 ++++++-------
>  net/ipv6/ping.c          |  2 +-
>  net/ipv6/raw.c           |  2 +-
>  net/ipv6/tcp_ipv6.c      |  2 +-
>  net/ipv6/udp.c           |  2 +-
>  net/l2tp/l2tp_ip6.c      |  4 ++--
>  net/sctp/ipv6.c          |  3 ++-
>  13 files changed, 23 insertions(+), 23 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>