linux-kernel - [PATCH 3.12 52/72] net/mlx4_core: Allow resetting VF admin mac to zero

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Date:   Mon,  7 Nov 2016 14:04:59 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Jack Morgenstein <jackm@....mellanox.co.il>,
        "David S . Miller" <davem@...emloft.net>,
        Juerg Haefliger <juerg.haefliger@....com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 52/72] net/mlx4_core: Allow resetting VF admin mac to zero

From: Jack Morgenstein <jackm@....mellanox.co.il>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 6e5224224faa50ec4c8949dcefadf895e565f0d1 upstream.

The VF administrative mac addresses (stored in the PF driver) are
initialized to zero when the PF driver starts up.

These addresses may be modified in the PF driver through ndo calls
initiated by iproute2 or libvirt.

While we allow the PF/host to change the VF admin mac address from zero
to a valid unicast mac, we do not allow restoring the VF admin mac to
zero. We currently only allow changing this mac to a different unicast mac.

This leads to problems when libvirt scripts are used to deal with
VF mac addresses, and libvirt attempts to revoke the mac so this
host will not use it anymore.

Fix this by allowing resetting a VF administrative MAC back to zero.

Fixes: 8f7ba3ca12f6 ('net/mlx4: Add set VF mac address support')
Signed-off-by: Jack Morgenstein <jackm@....mellanox.co.il>
Reported-by: Moshe Levi <moshele@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Juerg Haefliger <juerg.haefliger@....com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 35d3821bed50..58ccdc2b012d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2077,7 +2077,7 @@ static int mlx4_en_set_vf_mac(struct net_device *dev, int queue, u8 *mac)
 	struct mlx4_en_dev *mdev = en_priv->mdev;
 	u64 mac_u64 = mlx4_en_mac_to_u64(mac);

-	if (!is_valid_ether_addr(mac))
+	if (is_multicast_ether_addr(mac))
 		return -EINVAL;

 	return mlx4_set_vf_mac(mdev->dev, en_priv->port, queue, mac_u64);
-- 
2.10.2