mlx4: capability for link sensing

For ConnectX3 devices, we allow link sensing only if FW explicitly
reported it supports the feature.
For older versions (ConnectX1 and 2), if the card supports both link layer types
(Ethenet and Infiniband), link sensing is supported.
Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/main.c

@@ -274,6 +274,10 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 	dev->caps.stat_rate_support  = dev_cap->stat_rate_support;
 	dev->caps.max_gso_sz	     = dev_cap->max_gso_sz;
 
+	/* Sense port always allowed on supported devices for ConnectX1 and 2 */
+	if (dev->pdev->device != 0x1003)
+		dev->caps.flags |= MLX4_DEV_CAP_FLAG_SENSE_SUPPORT;
+
 	dev->caps.log_num_macs  = log_num_mac;
 	dev->caps.log_num_vlans = MLX4_LOG_NUM_VLANS;
 	dev->caps.log_num_prios = use_prio ? 3 : 0;
@@ -311,7 +315,8 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 		}
 		dev->caps.possible_type[i] = dev->caps.port_type[i];
 		mlx4_priv(dev)->sense.sense_allowed[i] =
-			dev->caps.supported_type[i] == MLX4_PORT_TYPE_AUTO;
+			((dev->caps.supported_type[i] == MLX4_PORT_TYPE_AUTO) &&
+			 (dev->caps.flags & MLX4_DEV_CAP_FLAG_SENSE_SUPPORT));
 
 		if (dev->caps.log_num_macs > dev_cap->log_max_macs[i]) {
 			dev->caps.log_num_macs = dev_cap->log_max_macs[i];
@@ -583,7 +588,8 @@ static ssize_t set_port_type(struct device *dev,
 			types[i] = mdev->caps.port_type[i+1];
 	}
 
-	if (!(mdev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP)) {
+	if (!(mdev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP) &&
+	    !(mdev->caps.flags & MLX4_DEV_CAP_FLAG_SENSE_SUPPORT)) {
 		for (i = 1; i <= mdev->caps.num_ports; i++) {
 			if (mdev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
 				mdev->caps.possible_type[i] = mdev->caps.port_type[i];

include/linux/mlx4/device.h

@@ -94,7 +94,8 @@ enum {
 	MLX4_DEV_CAP_FLAG_UDP_RSS	= 1LL << 40,
 	MLX4_DEV_CAP_FLAG_VEP_UC_STEER	= 1LL << 41,
 	MLX4_DEV_CAP_FLAG_VEP_MC_STEER	= 1LL << 42,
-	MLX4_DEV_CAP_FLAG_COUNTERS	= 1LL << 48
+	MLX4_DEV_CAP_FLAG_COUNTERS	= 1LL << 48,
+	MLX4_DEV_CAP_FLAG_SENSE_SUPPORT	= 1LL << 55
 };
 
 #define MLX4_ATTR_EXTENDED_PORT_INFO	cpu_to_be16(0xff90)