linux-kernel - [PATCH] hv_netvsc: Set VF priv_flags to IFF_NO_ADDRCONF before open to prevent IPv6 addrconf

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Message-ID: <20250710024603.10162-1-litian@redhat.com>
Date: Thu, 10 Jul 2025 10:46:03 +0800
From: Li Tian <litian@...hat.com>
To: netdev@...r.kernel.org,
	linux-hyperv@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH] hv_netvsc: Set VF priv_flags to IFF_NO_ADDRCONF before open  to prevent IPv6 addrconf

The use of the IFF_SLAVE flag was replaced by IFF_NO_ADDRCONF to
prevent ipv6 addrconf.

Commit 8a321cf7becc6c065ae595b837b826a2a81036b9
("net: add IFF_NO_ADDRCONF and use it in bonding to prevent ipv6 addrconf")

This new flag change was not made to hv_netvsc resulting in the VF being
assinged an IPv6.

Suggested-by: Cathy Avery <cavery@...hat.com>

Signed-off-by: Li Tian <litian@...hat.com>
---
 drivers/net/hyperv/netvsc_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c41a025c66f0..a31521f00681 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2317,8 +2317,8 @@ static int netvsc_prepare_bonding(struct net_device *vf_netdev)
 	if (!ndev)
 		return NOTIFY_DONE;
 
-	/* set slave flag before open to prevent IPv6 addrconf */
-	vf_netdev->flags |= IFF_SLAVE;
+	/* Set no addrconf flag before open to prevent IPv6 addrconf */
+	vf_netdev->priv_flags |= IFF_NO_ADDRCONF;
 	return NOTIFY_DONE;
 }
 
-- 
2.50.0