net/mlx5e: IPSec, Add Innova IPSec offload TX data path

In the TX data path, prepend a special metadata ethertype which
instructs the hardware to perform cryptography.

In addition, fill Software-Parser segment in TX descriptor so
that the hardware may parse the ESP protocol, and perform TX
checksum offload on the inner payload.

Support GSO, by providing the inverse of gso_size in the metadata.
This allows the FPGA to update the ESP header (seqno and seqiv) on the
resulting packets, by calculating the packet number within the GSO
back from the TCP sequence number.

Note that for GSO SKBs, the stack does not include an ESP trailer,
unlike the non-GSO case.

Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@mellanox.com>
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 170a9378d1f7..a037bd7edb46 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1114,6 +1114,8 @@ static int mlx5e_alloc_txqsq(struct mlx5e_channel *c,
 	sq->uar_map   = mdev->mlx5e_res.bfreg.map;
 	sq->max_inline      = params->tx_max_inline;
 	sq->min_inline_mode = params->tx_min_inline_mode;
+	if (MLX5_IPSEC_DEV(c->priv->mdev))
+		set_bit(MLX5E_SQ_STATE_IPSEC, &sq->state);
 
 	param->wq.db_numa_node = cpu_to_node(c->cpu);
 	err = mlx5_wq_cyc_create(mdev, &param->wq, sqc_wq, &sq->wq, &sq->wq_ctrl);
@@ -1933,6 +1935,7 @@ static void mlx5e_build_sq_param(struct mlx5e_priv *priv,
 
 	mlx5e_build_sq_param_common(priv, param);
 	MLX5_SET(wq, wq, log_wq_sz, params->log_sq_size);
+	MLX5_SET(sqc, sqc, allow_swp, !!MLX5_IPSEC_DEV(priv->mdev));
 }
 
 static void mlx5e_build_common_cq_param(struct mlx5e_priv *priv,
@@ -3527,6 +3530,11 @@ static netdev_features_t mlx5e_features_check(struct sk_buff *skb,
 	features = vlan_features_check(skb, features);
 	features = vxlan_features_check(skb, features);
 
+#ifdef CONFIG_MLX5_EN_IPSEC
+	if (mlx5e_ipsec_feature_check(skb, netdev, features))
+		return features;
+#endif
+
 	/* Validate if the tunneled packet is being offloaded by HW */
 	if (skb->encapsulation &&
 	    (features & NETIF_F_CSUM_MASK || features & NETIF_F_GSO_MASK))
@@ -4505,6 +4513,7 @@ static struct mlx5_interface mlx5e_interface = {
 
 void mlx5e_init(void)
 {
+	mlx5e_ipsec_build_inverse_table();
 	mlx5e_build_ptys2ethtool_map();
 	mlx5_register_interface(&mlx5e_interface);
 }