linux-kernel - [PATCH net v3] hv_netvsc: Set VF priv_flags to IFF_NO_ADDRCONF before open to prevent IPv6 addrconf

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Message-ID: <20250712100716.3991-1-litian@redhat.com>
Date: Sat, 12 Jul 2025 18:07:08 +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>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Long Li <longli@...rosoft.com>
Subject: [PATCH net v3] hv_netvsc: Set VF priv_flags to IFF_NO_ADDRCONF before open to prevent IPv6 addrconf

Set an additional flag IFF_NO_ADDRCONF to prevent ipv6 addrconf.

Commit 8a321cf7becc
("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.

Fixes: 8a321cf7becc ("net: add IFF_NO_ADDRCONF and use it in bonding to prevent ipv6 addrconf")
Suggested-by: Cathy Avery <cavery@...hat.com>
Signed-off-by: Li Tian <litian@...hat.com>
---
v3:
  - only fix commit message.
v2: https://lore.kernel.org/netdev/20250710024603.10162-1-litian@redhat.com/
  - instead of replacing flag, add it.
v1: https://lore.kernel.org/netdev/20250710024603.10162-1-litian@redhat.com/
---
 drivers/net/hyperv/netvsc_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c41a025c66f0..8be9bce66a4e 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -2317,8 +2317,11 @@ static int netvsc_prepare_bonding(struct net_device *vf_netdev)
 	if (!ndev)
 		return NOTIFY_DONE;
 
-	/* set slave flag before open to prevent IPv6 addrconf */
+	/* Set slave flag and no addrconf flag before open
+	 * to prevent IPv6 addrconf.
+	 */
 	vf_netdev->flags |= IFF_SLAVE;
+	vf_netdev->priv_flags |= IFF_NO_ADDRCONF;
 	return NOTIFY_DONE;
 }
 
-- 
2.50.0