tls: Add TLS 1.3 hardware offload support

Hi all,

This series adds TLS 1.3 hardware offload support including KeyUpdate
(rekey) and a selftest for validation.

Patch 1: Reject TLS 1.3 offload in chcr_ktls and nfp drivers
  These drivers only support TLS 1.2; add explicit version check.

Patch 2: mlx5e TLS 1.3 hardware offload
  Add TLS 1.3 TX/RX offload on ConnectX-6 Dx and newer.
  Handle 12-byte IV format and TLS_1_3 context type.

Patch 3: Core TLS 1.3 hardware offload support
  Extend tls_device.c for TLS 1.3 record format (content type
  appended before tag). Handle TLS 1.3 IV construction in fallback.

Patch 4: Split tls_set_sw_offload into init/finalize
  Allows HW RX path to init SW context, attempt HW setup, then
  finalize. Required for proper rekey error handling.

Patch 5: Hardware offload key update (rekey) support
  Delete old HW context and add new one with updated key.
  Track ACKs to ensure old-key data is flushed before HW switch.

Patch 6: Selftest for hardware offload
  Python wrapper + C binary using NetDrvEpEnv framework.
  Tests TLS 1.2/1.3, AES-GCM-128/256, rekey, various buffer sizes.

Tested on Mellanox ConnectX-6 Dx (Crypto Enabled) with TLS 1.3 AES-GCM-128/256
and multiple rekey cycles.

Changes in v10:
- Drop rekey_complete_seq; simplify clean_acked to set REKEY_READY
  once acked_seq >= boundary_seq.
- Flush pending SW records (tls_encrypt_async_wait + tls_tx_records)
  at start of complete_rekey; return -EAGAIN if send buffer full.
- Add start_marker_record + tcp_write_collapse_fence() in
  complete_rekey so the NIC passes through SW-encrypted data
  (including retransmits) before the HW boundary.
- Fix flag clearing order: PENDING before READY with
  smp_mb__after_atomic() to prevent clean_acked race.
- Use crypto_free_aead() instead of tls_sw_release_resources_tx().
- mlx5: fix reverse Christmas tree variable ordering.

Rishikesh

Rishikesh Jethwani (6):
  net: tls: reject TLS 1.3 offload in chcr_ktls and nfp drivers
  net/mlx5e: add TLS 1.3 hardware offload support
  tls: add TLS 1.3 hardware offload support
  tls: split tls_set_sw_offload into init and finalize stages
  tls: add hardware offload key update support
  selftests: net: add TLS hardware offload test

 .../chelsio/inline_crypto/ch_ktls/chcr_ktls.c |   3 +
 .../mellanox/mlx5/core/en_accel/ktls.h        |   8 +-
 .../mellanox/mlx5/core/en_accel/ktls_txrx.c   |  14 +-
 .../net/ethernet/netronome/nfp/crypto/tls.c   |   3 +
 include/net/tls.h                             |  76 +-
 include/uapi/linux/snmp.h                     |   2 +
 net/tls/tls.h                                 |  19 +-
 net/tls/tls_device.c                          | 565 +++++++++--
 net/tls/tls_device_fallback.c                 |  82 +-
 net/tls/tls_main.c                            |  33 +-
 net/tls/tls_proc.c                            |   2 +
 net/tls/tls_sw.c                              | 107 ++-
 .../selftests/drivers/net/hw/.gitignore       |   1 +
 .../testing/selftests/drivers/net/hw/Makefile |   2 +
 .../selftests/drivers/net/hw/tls_hw_offload.c | 902 ++++++++++++++++++
 .../drivers/net/hw/tls_hw_offload.py          | 281 ++++++
 16 files changed, 1921 insertions(+), 179 deletions(-)
 create mode 100644 tools/testing/selftests/drivers/net/hw/tls_hw_offload.c
 create mode 100755 tools/testing/selftests/drivers/net/hw/tls_hw_offload.py

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2.25.1