net/mlx5e: kTLS, Add kTLS RX resync support

Implement the RX resync procedure, using the TLS async resync API.

The HW offload of TLS decryption in RX side might get out-of-sync
due to out-of-order reception of packets.
This requires SW intervention to update the HW context and get it
back in-sync.

Performance:
CPU: Intel(R) Xeon(R) CPU E5-2687W v4 @ 3.00GHz, 24 cores, HT off
NIC: ConnectX-6 Dx 100GbE dual port

Goodput (app-layer throughput) comparison:
+---------------+-------+-------+---------+
| # connections |   1   |   4   |    8    |
+---------------+-------+-------+---------+
| SW (Gbps)     |  7.26 | 24.70 |   50.30 |
+---------------+-------+-------+---------+
| HW (Gbps)     | 18.50 | 64.30 |   92.90 |
+---------------+-------+-------+---------+
| Speedup       | 2.55x | 2.56x | 1.85x * |
+---------------+-------+-------+---------+

* After linerate is reached, diff is observed in CPU util.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Author: Tariq Toukan

drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h

@@ -14,6 +14,7 @@ enum mlx5e_icosq_wqe_type {
 #ifdef CONFIG_MLX5_EN_TLS
 	MLX5E_ICOSQ_WQE_UMR_TLS,
 	MLX5E_ICOSQ_WQE_SET_PSV_TLS,
+	MLX5E_ICOSQ_WQE_GET_PSV_TLS,
 #endif
 };
 
@@ -122,6 +123,9 @@ struct mlx5e_icosq_wqe_info {
 		struct {
 			struct mlx5e_ktls_offload_context_rx *priv_rx;
 		} tls_set_params;
+		struct {
+			struct mlx5e_ktls_rx_resync_buf *buf;
+		} tls_get_params;
 #endif
 	};
 };

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

@@ -40,7 +40,11 @@ static int mlx5e_ktls_resync(struct net_device *netdev,
 			     struct sock *sk, u32 seq, u8 *rcd_sn,
 			     enum tls_offload_ctx_dir direction)
 {
-	return -EOPNOTSUPP;
+	if (unlikely(direction != TLS_OFFLOAD_CTX_DIR_RX))
+		return -EOPNOTSUPP;
+
+	mlx5e_ktls_rx_resync(netdev, sk, seq, rcd_sn);
+	return 0;
 }
 
 static const struct tlsdev_ops mlx5e_ktls_ops = {