net/mlx4: Spoofcheck and zero MAC can't coexist

Spoofcheck can't be enabled if VF MAC is zero.
Vice versa, can't zero MAC if spoofcheck is on.

Fixes: 8f7ba3ca12f6 ('net/mlx4: Add set VF mac address support')
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 32 insertions, 8 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index a49072b4fa52..e8c105164931 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
@@ -43,6 +43,7 @@
 #include <linux/semaphore.h>
 #include <rdma/ib_smi.h>
 #include <linux/delay.h>
+#include <linux/etherdevice.h>
 
 #include <asm/io.h>
 
@@ -2955,7 +2956,7 @@ static bool mlx4_valid_vf_state_change(struct mlx4_dev *dev, int port,
         return false;
 }
 
-int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u64 mac)
+int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u8 *mac)
 {
         struct mlx4_priv *priv = mlx4_priv(dev);
         struct mlx4_vport_state *s_info;
@@ -2964,13 +2965,22 @@ int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u64 mac)
         if (!mlx4_is_master(dev))
                 return -EPROTONOSUPPORT;
 
+        if (is_multicast_ether_addr(mac))
+                return -EINVAL;
+
         slave = mlx4_get_slave_indx(dev, vf);
         if (slave < 0)
                 return -EINVAL;
 
         port = mlx4_slaves_closest_port(dev, slave, port);
         s_info = &priv->mfunc.master.vf_admin[slave].vport[port];
-        s_info->mac = mac;
+
+        if (s_info->spoofchk && is_zero_ether_addr(mac)) {
+                mlx4_info(dev, "MAC invalidation is not allowed when spoofchk is on\n");
+                return -EPERM;
+        }
+
+        s_info->mac = mlx4_mac_to_u64(mac);
         mlx4_info(dev, "default mac on vf %d port %d to %llX will take effect only after vf restart\n",
                   vf, port, s_info->mac);
         return 0;
@@ -3143,6 +3153,7 @@ int mlx4_set_vf_spoofchk(struct mlx4_dev *dev, int port, int vf, bool setting)
         struct mlx4_priv *priv = mlx4_priv(dev);
         struct mlx4_vport_state *s_info;
         int slave;
+        u8 mac[ETH_ALEN];
 
         if ((!mlx4_is_master(dev)) ||
             !(dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_FSM))
@@ -3154,6 +3165,13 @@ int mlx4_set_vf_spoofchk(struct mlx4_dev *dev, int port, int vf, bool setting)
 
         port = mlx4_slaves_closest_port(dev, slave, port);
         s_info = &priv->mfunc.master.vf_admin[slave].vport[port];
+
+        mlx4_u64_to_mac(mac, s_info->mac);
+        if (setting && !is_valid_ether_addr(mac)) {
+                mlx4_info(dev, "Illegal MAC with spoofchk\n");
+                return -EPERM;
+        }
+
         s_info->spoofchk = setting;
 
         return 0;
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index afe4444e5434..61420473fe5f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2485,12 +2485,8 @@ static int mlx4_en_set_vf_mac(struct net_device *dev, int queue, u8 *mac)
 {
         struct mlx4_en_priv *en_priv = netdev_priv(dev);
         struct mlx4_en_dev *mdev = en_priv->mdev;
-        u64 mac_u64 = mlx4_mac_to_u64(mac);
 
-        if (is_multicast_ether_addr(mac))
-                return -EINVAL;
-
-        return mlx4_set_vf_mac(mdev->dev, en_priv->port, queue, mac_u64);
+        return mlx4_set_vf_mac(mdev->dev, en_priv->port, queue, mac);
 }
 
 static int mlx4_en_set_vf_vlan(struct net_device *dev, int vf, u16 vlan, u8 qos,
diff --git a/include/linux/mlx4/cmd.h b/include/linux/mlx4/cmd.h
index 1f3568694a57..7b74afcbbab2 100644
--- a/include/linux/mlx4/cmd.h
+++ b/include/linux/mlx4/cmd.h
@@ -308,7 +308,7 @@ int mlx4_get_counter_stats(struct mlx4_dev *dev, int counter_index,
 int mlx4_get_vf_stats(struct mlx4_dev *dev, int port, int vf_idx,
                       struct ifla_vf_stats *vf_stats);
 u32 mlx4_comm_get_version(void);
-int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u64 mac);
+int mlx4_set_vf_mac(struct mlx4_dev *dev, int port, int vf, u8 *mac);
 int mlx4_set_vf_vlan(struct mlx4_dev *dev, int port, int vf, u16 vlan,
                      u8 qos, __be16 proto);
 int mlx4_set_vf_rate(struct mlx4_dev *dev, int port, int vf, int min_tx_rate,
diff --git a/include/linux/mlx4/driver.h b/include/linux/mlx4/driver.h
index bd0e7075ea6d..e965e5090d96 100644
--- a/include/linux/mlx4/driver.h
+++ b/include/linux/mlx4/driver.h
@@ -104,4 +104,14 @@ static inline u64 mlx4_mac_to_u64(u8 *addr)
         return mac;
 }
 
+static inline void mlx4_u64_to_mac(u8 *addr, u64 mac)
+{
+        int i;
+
+        for (i = ETH_ALEN; i > 0; i--) {
+                addr[i - 1] = mac && 0xFF;
+                mac >>= 8;
+        }
+}
+
 #endif /* MLX4_DRIVER_H */