[RFC PATCH v7 3/4] mlx5: TLS 1.3 hardware offload support
From: Rishikesh Jethwani <hidden>
Date: 2026-02-05 23:18:14
Subsystem:
mellanox ethernet driver (mlx5e), mellanox ethernet innova drivers, mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Tariq Toukan, Mark Bloch, Leon Romanovsky, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Add TLS 1.3 hardware offload support to mlx5 driver, enabling both TX and RX hardware acceleration for TLS 1.3 connections on Mellanox ConnectX-6 Dx and newer adapters. This patch enables: - TLS 1.3 version detection and validation with proper capability checking - TLS 1.3 crypto context configuration using MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_3 (0x3) - Correct IV handling for TLS 1.3 (12-byte IV vs TLS 1.2's 4-byte salt) - Hardware offload for both TLS 1.3 AES-GCM-128 and AES-GCM-256 cipher suites Key differences from TLS 1.2: - TLS 1.2: Only 4-byte salt copied to gcm_iv, explicit IV in each record - TLS 1.3: Full 12-byte IV (salt + iv) copied to gcm_iv + implicit_iv * salt (4 bytes) → gcm_iv[0:3] * iv (8 bytes) → gcm_iv[4:7] + implicit_iv[0:3] * Note: gcm_iv and implicit_iv are contiguous in memory The EXTRACT_INFO_FIELDS macro is updated to also extract the 'iv' field which is needed for TLS 1.3. Tested on Mellanox ConnectX-6 Dx (Crypto Enabled) with TLS 1.3 AES-GCM-128 and AES-GCM-256 cipher suites. Signed-off-by: Rishikesh Jethwani <redacted> --- .../ethernet/mellanox/mlx5/core/en_accel/ktls.h | 8 +++++++- .../mellanox/mlx5/core/en_accel/ktls_txrx.c | 14 +++++++++++--- 2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.h
index 07a04a142a2e..0469ca6a0762 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.h@@ -30,7 +30,9 @@ static inline bool mlx5e_is_ktls_device(struct mlx5_core_dev *mdev) return false; return (MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_128) || - MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_256)); + MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_256) || + MLX5_CAP_TLS(mdev, tls_1_3_aes_gcm_128) || + MLX5_CAP_TLS(mdev, tls_1_3_aes_gcm_256)); } static inline bool mlx5e_ktls_type_check(struct mlx5_core_dev *mdev,
@@ -40,10 +42,14 @@ static inline bool mlx5e_ktls_type_check(struct mlx5_core_dev *mdev, case TLS_CIPHER_AES_GCM_128: if (crypto_info->version == TLS_1_2_VERSION) return MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_128); + else if (crypto_info->version == TLS_1_3_VERSION) + return MLX5_CAP_TLS(mdev, tls_1_3_aes_gcm_128); break; case TLS_CIPHER_AES_GCM_256: if (crypto_info->version == TLS_1_2_VERSION) return MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_256); + else if (crypto_info->version == TLS_1_3_VERSION) + return MLX5_CAP_TLS(mdev, tls_1_3_aes_gcm_256); break; }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_txrx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_txrx.c
index 570a912dd6fa..f3f90ad6c6cf 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_txrx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_txrx.c@@ -6,6 +6,7 @@ enum { MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_2 = 0x2, + MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_3 = 0x3, }; enum {
@@ -15,8 +16,10 @@ enum { #define EXTRACT_INFO_FIELDS do { \ salt = info->salt; \ rec_seq = info->rec_seq; \ + iv = info->iv; \ salt_sz = sizeof(info->salt); \ rec_seq_sz = sizeof(info->rec_seq); \ + iv_sz = sizeof(info->iv); \ } while (0) static void
@@ -25,8 +28,8 @@ fill_static_params(struct mlx5_wqe_tls_static_params_seg *params, u32 key_id, u32 resync_tcp_sn) { char *initial_rn, *gcm_iv; - u16 salt_sz, rec_seq_sz; - char *salt, *rec_seq; + u16 salt_sz, rec_seq_sz, iv_sz; + char *salt, *rec_seq, *iv; u8 tls_version; u8 *ctx;
@@ -59,7 +62,12 @@ fill_static_params(struct mlx5_wqe_tls_static_params_seg *params, memcpy(gcm_iv, salt, salt_sz); memcpy(initial_rn, rec_seq, rec_seq_sz); - tls_version = MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_2; + if (crypto_info->crypto_info.version == TLS_1_3_VERSION) { + memcpy(gcm_iv + salt_sz, iv, iv_sz); + tls_version = MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_3; + } else { + tls_version = MLX5E_STATIC_PARAMS_CONTEXT_TLS_1_2; + } MLX5_SET(tls_static_params, ctx, tls_version, tls_version); MLX5_SET(tls_static_params, ctx, const_1, 1);
--
2.25.1