netdev - Re: [PATCH net-next] vrf: Remove unnecessary RCU-bh critical section

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Message-ID: <20230822073201.GO2711035@kernel.org>
Date: Tue, 22 Aug 2023 09:32:01 +0200
From: Simon Horman <horms@...nel.org>
To: Ido Schimmel <idosch@...dia.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
	pabeni@...hat.com, edumazet@...gle.com, dsahern@...nel.org,
	mlxsw@...dia.com
Subject: Re: [PATCH net-next] vrf: Remove unnecessary RCU-bh critical section

On Mon, Aug 21, 2023 at 05:23:39PM +0300, Ido Schimmel wrote:
> dev_queue_xmit_nit() already uses rcu_read_lock() / rcu_read_unlock()
> and nothing suggests that softIRQs should be disabled around it.
> Therefore, remove the rcu_read_lock_bh() / rcu_read_unlock_bh()
> surrounding it.
> 
> Tested using [1] with lockdep enabled.
> 
> [1]
>  #!/bin/bash
> 
>  ip link add name vrf1 up type vrf table 100
>  ip link add name veth0 type veth peer name veth1
>  ip link set dev veth1 master vrf1
>  ip link set dev veth0 up
>  ip link set dev veth1 up
>  ip address add 192.0.2.1/24 dev veth0
>  ip address add 192.0.2.2/24 dev veth1
>  ip rule add pref 32765 table local
>  ip rule del pref 0
>  tcpdump -i vrf1 -c 20 -w /dev/null &
>  sleep 10
>  ping -i 0.1 -c 10 -q 192.0.2.2
> 
> Signed-off-by: Ido Schimmel <idosch@...dia.com>

Reviewed-by: Simon Horman <horms@...nel.org>