netdev - Re: [PATCH net-next 0/2] Bonding: support new xfrm state offload functions

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Message-ID: <334c87f5-cec8-46b5-a4d4-72b2165726d9@blackwall.org>
Date: Fri, 16 Aug 2024 09:06:12 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>,
 "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
 Tariq Toukan <tariqt@...dia.com>, Jianbo Liu <jianbol@...dia.com>,
 Sabrina Dubroca <sd@...asysnail.net>
Subject: Re: [PATCH net-next 0/2] Bonding: support new xfrm state offload
 functions

On 16/08/2024 06:55, Hangbin Liu wrote:
> I planned to add the new XFRM state offload functions after Jianbo's
> patchset [1], but it seems that may take some time. Therefore, I am
> posting these two patches to net-next now, as our users are waiting for
> this functionality. If Jianbo's patch is applied first, I can update these
> patches accordingly.
> 
> [1] https://lore.kernel.org/netdev/20240815142103.2253886-2-tariqt@nvidia.com
> 
> Hangbin Liu (2):
>   bonding: Add ESN support to IPSec HW offload
>   bonding: support xfrm state update
> 
>  drivers/net/bonding/bond_main.c | 76 +++++++++++++++++++++++++++++++++
>  1 file changed, 76 insertions(+)
> 

(not related to this set, but to bond xfrm)
By the way looking at bond's xfrm code, what prevents bond_ipsec_offload_ok()
from dereferencing a null ptr?
I mean it does:
        curr_active = rcu_dereference(bond->curr_active_slave);
        real_dev = curr_active->dev;

If this is running only under RCU as the code suggests then
curr_active_slave can change to NULL in parallel. Should there be a
check for curr_active before deref or am I missing something?

Cheers,
 Nik