netdev - Re: [PATCH net v2] net: bonding: update the slave array for broadcast mode

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Message-ID: <775230.1760721296@famine>
Date: Fri, 17 Oct 2025 10:14:56 -0700
From: Jay Vosburgh <jv@...sburgh.net>
To: Tonghao Zhang <tonghao@...aicloud.com>
cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
    Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
    Jonathan Corbet <corbet@....net>,
    Andrew Lunn <andrew+netdev@...n.ch>,
    Nikolay Aleksandrov <razor@...ckwall.org>,
    Hangbin Liu <liuhangbin@...il.com>,
    Jiri Slaby <jirislaby@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH net v2] net: bonding: update the slave array for broadcast
 mode

Tonghao Zhang <tonghao@...aicloud.com> wrote:

>This patch fixes ce7a381697cb ("net: bonding: add broadcast_neighbor option for 802.3ad").
>Before this commit, on the broadcast mode, all devices were traversed using the
>bond_for_each_slave_rcu. This patch supports traversing devices by using all_slaves.
>Therefore, we need to update the slave array when enslave or release slave.
>
>Fixes: ce7a381697cb ("net: bonding: add broadcast_neighbor option for 802.3ad")
>Cc: Jay Vosburgh <jv@...sburgh.net>
>Cc: "David S. Miller" <davem@...emloft.net>
>Cc: Eric Dumazet <edumazet@...gle.com>
>Cc: Jakub Kicinski <kuba@...nel.org>
>Cc: Paolo Abeni <pabeni@...hat.com>
>Cc: Simon Horman <horms@...nel.org>
>Cc: Jonathan Corbet <corbet@....net>
>Cc: Andrew Lunn <andrew+netdev@...n.ch>
>Cc: Nikolay Aleksandrov <razor@...ckwall.org>
>Cc: Hangbin Liu <liuhangbin@...il.com>
>Cc: Jiri Slaby <jirislaby@...nel.org>
>Cc: <stable@...r.kernel.org>
>Reported-by: Jiri Slaby <jirislaby@...nel.org>
>Tested-by: Jiri Slaby <jirislaby@...nel.org>
>Link: https://lore.kernel.org/all/a97e6e1e-81bc-4a79-8352-9e4794b0d2ca@kernel.org/
>Signed-off-by: Tonghao Zhang <tonghao@...aicloud.com>
>Reviewed-by: Hangbin Liu <liuhangbin@...il.com>

Acked-by: Jay Vosburgh <jv@...sburgh.net>

>---
>v2:
>- fix the typo in the comments, salve -> slave
>- add the target repo in the subject
>---
> drivers/net/bonding/bond_main.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index 17c7542be6a5..2d6883296e32 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -2384,7 +2384,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
> 		unblock_netpoll_tx();
> 	}
> 
>-	if (bond_mode_can_use_xmit_hash(bond))
>+	/* broadcast mode uses the all_slaves to loop through slaves. */
>+	if (bond_mode_can_use_xmit_hash(bond) ||
>+	    BOND_MODE(bond) == BOND_MODE_BROADCAST)
> 		bond_update_slave_arr(bond, NULL);
> 
> 	if (!slave_dev->netdev_ops->ndo_bpf ||
>@@ -2560,7 +2562,8 @@ static int __bond_release_one(struct net_device *bond_dev,
> 
> 	bond_upper_dev_unlink(bond, slave);
> 
>-	if (bond_mode_can_use_xmit_hash(bond))
>+	if (bond_mode_can_use_xmit_hash(bond) ||
>+	    BOND_MODE(bond) == BOND_MODE_BROADCAST)
> 		bond_update_slave_arr(bond, slave);
> 
> 	slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
>-- 
>2.34.1
>