net/mlx5: Simplify IPsec capabilities logic

Reduce number of hard-coded IPsec capabilities by making sure
that mlx5_ipsec_device_caps() sets only supported bits.

As part of this change, remove _ACCEL_ notations from the capabilities
names as they represent IPsec-capable device, so it is aligned with
MLX5_CAP_IPSEC() macro. And prepare the code to IPsec full offload mode.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -215,7 +215,7 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 		return -EINVAL;
 	}
 	if (x->props.flags & XFRM_STATE_ESN &&
-	    !(mlx5_ipsec_device_caps(priv->mdev) & MLX5_ACCEL_IPSEC_CAP_ESN)) {
+	    !(mlx5_ipsec_device_caps(priv->mdev) & MLX5_IPSEC_CAP_ESN)) {
 		netdev_info(netdev, "Cannot offload ESN xfrm states\n");
 		return -EINVAL;
 	}
@@ -262,11 +262,6 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 		netdev_info(netdev, "Cannot offload xfrm states with geniv other than seqiv\n");
 		return -EINVAL;
 	}
-	if (x->props.family == AF_INET6 &&
-	    !(mlx5_ipsec_device_caps(priv->mdev) & MLX5_ACCEL_IPSEC_CAP_IPV6)) {
-		netdev_info(netdev, "IPv6 xfrm state offload is not supported by this device\n");
-		return -EINVAL;
-	}
 	return 0;
 }
 
@@ -457,12 +452,6 @@ void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv)
 	if (!mlx5_ipsec_device_caps(mdev))
 		return;
 
-	if (!(mlx5_ipsec_device_caps(mdev) & MLX5_ACCEL_IPSEC_CAP_ESP) ||
-	    !MLX5_CAP_ETH(mdev, swp)) {
-		mlx5_core_dbg(mdev, "mlx5e: ESP and SWP offload not supported\n");
-		return;
-	}
-
 	mlx5_core_info(mdev, "mlx5e: IPSec ESP acceleration enabled\n");
 	netdev->xfrmdev_ops = &mlx5e_ipsec_xfrmdev_ops;
 	netdev->features |= NETIF_F_HW_ESP;
@@ -476,8 +465,7 @@ void mlx5e_ipsec_build_netdev(struct mlx5e_priv *priv)
 	netdev->features |= NETIF_F_HW_ESP_TX_CSUM;
 	netdev->hw_enc_features |= NETIF_F_HW_ESP_TX_CSUM;
 
-	if (!(mlx5_ipsec_device_caps(mdev) & MLX5_ACCEL_IPSEC_CAP_LSO) ||
-	    !MLX5_CAP_ETH(mdev, swp_lso)) {
+	if (!MLX5_CAP_ETH(mdev, swp_lso)) {
 		mlx5_core_dbg(mdev, "mlx5e: ESP LSO not supported\n");
 		return;
 	}

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -102,12 +102,9 @@ struct mlx5_accel_esp_xfrm_attrs {
 	u8 is_ipv6;
 };
 
-enum mlx5_accel_ipsec_cap {
-	MLX5_ACCEL_IPSEC_CAP_DEVICE		= 1 << 0,
-	MLX5_ACCEL_IPSEC_CAP_ESP		= 1 << 1,
-	MLX5_ACCEL_IPSEC_CAP_IPV6		= 1 << 2,
-	MLX5_ACCEL_IPSEC_CAP_LSO		= 1 << 3,
-	MLX5_ACCEL_IPSEC_CAP_ESN		= 1 << 4,
+enum mlx5_ipsec_cap {
+	MLX5_IPSEC_CAP_CRYPTO		= 1 << 0,
+	MLX5_IPSEC_CAP_ESN		= 1 << 1,
 };
 
 struct mlx5e_priv;

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c

@@ -7,7 +7,7 @@
 
 u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev)
 {
-	u32 caps;
+	u32 caps = 0;
 
 	if (!MLX5_CAP_GEN(mdev, ipsec_offload))
 		return 0;
@@ -19,23 +19,23 @@ u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev)
 	    MLX5_HCA_CAP_GENERAL_OBJECT_TYPES_IPSEC))
 		return 0;
 
-	if (!MLX5_CAP_IPSEC(mdev, ipsec_crypto_offload) ||
-	    !MLX5_CAP_ETH(mdev, insert_trailer))
-		return 0;
-
 	if (!MLX5_CAP_FLOWTABLE_NIC_TX(mdev, ipsec_encrypt) ||
 	    !MLX5_CAP_FLOWTABLE_NIC_RX(mdev, ipsec_decrypt))
 		return 0;
 
-	caps = MLX5_ACCEL_IPSEC_CAP_DEVICE | MLX5_ACCEL_IPSEC_CAP_IPV6 |
-	       MLX5_ACCEL_IPSEC_CAP_LSO;
+	if (!MLX5_CAP_IPSEC(mdev, ipsec_crypto_esp_aes_gcm_128_encrypt) ||
+	    !MLX5_CAP_IPSEC(mdev, ipsec_crypto_esp_aes_gcm_128_decrypt))
+		return 0;
 
-	if (MLX5_CAP_IPSEC(mdev, ipsec_crypto_esp_aes_gcm_128_encrypt) &&
-	    MLX5_CAP_IPSEC(mdev, ipsec_crypto_esp_aes_gcm_128_decrypt))
-		caps |= MLX5_ACCEL_IPSEC_CAP_ESP;
+	if (MLX5_CAP_IPSEC(mdev, ipsec_crypto_offload) &&
+	    MLX5_CAP_ETH(mdev, insert_trailer) && MLX5_CAP_ETH(mdev, swp))
+		caps |= MLX5_IPSEC_CAP_CRYPTO;
+
+	if (!caps)
+		return 0;
 
 	if (MLX5_CAP_IPSEC(mdev, ipsec_esn))
-		caps |= MLX5_ACCEL_IPSEC_CAP_ESN;
+		caps |= MLX5_IPSEC_CAP_ESN;
 
 	/* We can accommodate up to 2^24 different IPsec objects
 	 * because we use up to 24 bit in flow table metadata