net/mlx4_en: Adding support of turning off link autonegotiation via ethtool

This feature will allow the user to disable auto negotiation
on the port for mlx4 devices while setting the speed is limited
to 1GbE speeds.
Other speeds will not be accepted in autoneg off mode.

This functionality is permitted providing that the firmware
is compatible with this feature.
The above is determined by querying a new dedicated capability
bit in the device.

Signed-off-by: Ariel Levkovich <lariel@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index 785757f..ca730d4 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -902,6 +902,7 @@ mlx4_en_set_link_ksettings(struct net_device *dev,
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_ptys_reg ptys_reg;
        __be32 proto_admin;
+       u8 cur_autoneg;
        int ret;
 
        u32 ptys_adv = ethtool2ptys_link_modes(
@@ -931,10 +932,21 @@ mlx4_en_set_link_ksettings(struct net_device *dev,
                return 0;
        }
 
-       proto_admin = link_ksettings->base.autoneg == AUTONEG_ENABLE ?
-               cpu_to_be32(ptys_adv) :
-               speed_set_ptys_admin(priv, speed,
-                                    ptys_reg.eth_proto_cap);
+       cur_autoneg = ptys_reg.flags & MLX4_PTYS_AN_DISABLE_ADMIN ?
+                               AUTONEG_DISABLE : AUTONEG_ENABLE;
+
+       if (link_ksettings->base.autoneg == AUTONEG_DISABLE) {
+               proto_admin = speed_set_ptys_admin(priv, speed,
+                                                  ptys_reg.eth_proto_cap);
+               if ((be32_to_cpu(proto_admin) &
+                    (MLX4_PROT_MASK(MLX4_1000BASE_CX_SGMII) |
+                     MLX4_PROT_MASK(MLX4_1000BASE_KX))) &&
+                   (ptys_reg.flags & MLX4_PTYS_AN_DISABLE_CAP))
+                       ptys_reg.flags |= MLX4_PTYS_AN_DISABLE_ADMIN;
+       } else {
+               proto_admin = cpu_to_be32(ptys_adv);
+               ptys_reg.flags &= ~MLX4_PTYS_AN_DISABLE_ADMIN;
+       }
 
        proto_admin &= ptys_reg.eth_proto_cap;
        if (!proto_admin) {
@@ -942,7 +954,9 @@ mlx4_en_set_link_ksettings(struct net_device *dev,
                return -EINVAL; /* nothing to change due to bad input */
        }
 
-       if (proto_admin == ptys_reg.eth_proto_admin)
+       if ((proto_admin == ptys_reg.eth_proto_admin) &&
+           ((ptys_reg.flags & MLX4_PTYS_AN_DISABLE_CAP) &&
+            (link_ksettings->base.autoneg == cur_autoneg)))
                return 0; /* Nothing to change */
 
        en_dbg(DRV, priv, "mlx4_ACCESS_PTYS_REG SET: ptys_reg.eth_proto_admin = 0x%x\n",

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 6533c16..c3ac945 100644 (file)
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -1539,8 +1539,13 @@ enum mlx4_ptys_proto {
        MLX4_PTYS_EN = 1<<2,
 };
 
+enum mlx4_ptys_flags {
+       MLX4_PTYS_AN_DISABLE_CAP   = 1 << 5,
+       MLX4_PTYS_AN_DISABLE_ADMIN = 1 << 6,
+};
+
 struct mlx4_ptys_reg {
-       u8 resrvd1;
+       u8 flags;
        u8 local_port;
        u8 resrvd2;
        u8 proto_mask;