Subject: Re: [PATCH net-next v3 0/8] psp: add a kselftest suite and netdevsim implementation

From: Willem de Bruijn <[email-masked]>
Date: Sun, 28 Sep 2025 12:00:15 -0400

Jakub Kicinski wrote:
> Add a basic test suite for drivers that support PSP. Also, add a PSP
> implementation in the netdevsim driver.
> 
> The netdevsim implementation does encapsulation and decapsulation of
> PSP packets, but no crypto.
> 
> The tests cover the basic usage of the uapi, and demonstrate key
> exchange and connection setup. The tests and netdevsim support IPv4
> and IPv6. Here is an example run on a system with a CX7 NIC.
> 
>     TAP version 13
>     1..28
>     ok 1 psp.data_basic_send_v0_ip4
>     ok 2 psp.data_basic_send_v0_ip6
>     ok 3 psp.data_basic_send_v1_ip4
>     ok 4 psp.data_basic_send_v1_ip6
>     ok 5 psp.data_basic_send_v2_ip4 # SKIP ('PSP version not supported', 'hdr0-aes-gmac-128')
>     ok 6 psp.data_basic_send_v2_ip6 # SKIP ('PSP version not supported', 'hdr0-aes-gmac-128')
>     ok 7 psp.data_basic_send_v3_ip4 # SKIP ('PSP version not supported', 'hdr0-aes-gmac-256')
>     ok 8 psp.data_basic_send_v3_ip6 # SKIP ('PSP version not supported', 'hdr0-aes-gmac-256')
>     ok 9 psp.data_mss_adjust_ip4
>     ok 10 psp.data_mss_adjust_ip6
>     ok 11 psp.dev_list_devices
>     ok 12 psp.dev_get_device
>     ok 13 psp.dev_get_device_bad
>     ok 14 psp.dev_rotate
>     ok 15 psp.dev_rotate_spi
>     ok 16 psp.assoc_basic
>     ok 17 psp.assoc_bad_dev
>     ok 18 psp.assoc_sk_only_conn
>     ok 19 psp.assoc_sk_only_mismatch
>     ok 20 psp.assoc_sk_only_mismatch_tx
>     ok 21 psp.assoc_sk_only_unconn
>     ok 22 psp.assoc_version_mismatch
>     ok 23 psp.assoc_twice
>     ok 24 psp.data_send_bad_key
>     ok 25 psp.data_send_disconnect
>     ok 26 psp.data_stale_key
>     ok 27 psp.removal_device_rx # XFAIL Test only works on netdevsim
>     ok 28 psp.removal_device_bi # XFAIL Test only works on netdevsim
>     # Totals: pass:22 fail:0 xfail:2 xpass:0 skip:4 error:0
>     # 
>     # Responder logs (0):
>     # STDERR:
>     #  Set PSP enable on device 1 to 0x3
>     #  Set PSP enable on device 1 to 0x0
> 
> v3:
>  - fix netdevsim bugs
>  - rework the skipping
>  - use errno
>  - remove duplicated condition
> v2: https://lore.kernel.org/[email-masked]
>   - fix pylint warnings
>   - insert CONFIG_INET_PSP in alphebetical order
>   - use branch to skip all tests
>   - fix compilation error when CONFIG_INET_PSP is not set
> v1: https://lore.kernel.org/[email-masked]
> 
> Jakub Kicinski (8):
>   netdevsim: a basic test PSP implementation
>   selftests: drv-net: base device access API test
>   selftests: drv-net: add PSP responder
>   selftests: drv-net: psp: add basic data transfer and key rotation
>     tests
>   selftests: drv-net: psp: add association tests
>   selftests: drv-net: psp: add connection breaking tests
>   selftests: drv-net: psp: add test for auto-adjusting TCP MSS
>   selftests: drv-net: psp: add tests for destroying devices
> 
>  drivers/net/netdevsim/Makefile                |   4 +
>  tools/testing/selftests/drivers/net/Makefile  |  10 +
>  drivers/net/netdevsim/netdevsim.h             |  27 +
>  drivers/net/netdevsim/netdev.c                |  43 +-
>  drivers/net/netdevsim/psp.c                   | 225 +++++++
>  net/core/skbuff.c                             |   1 +
>  .../selftests/drivers/net/psp_responder.c     | 483 ++++++++++++++
>  .../testing/selftests/drivers/net/.gitignore  |   1 +
>  tools/testing/selftests/drivers/net/config    |   1 +
>  .../drivers/net/hw/lib/py/__init__.py         |   4 +-
>  .../selftests/drivers/net/lib/py/__init__.py  |   4 +-
>  .../selftests/drivers/net/lib/py/env.py       |   4 +
>  tools/testing/selftests/drivers/net/psp.py    | 627 ++++++++++++++++++
>  .../testing/selftests/net/lib/py/__init__.py  |   2 +-
>  tools/testing/selftests/net/lib/py/ksft.py    |  10 +
>  tools/testing/selftests/net/lib/py/ynl.py     |   5 +
>  16 files changed, 1440 insertions(+), 11 deletions(-)
>  create mode 100644 drivers/net/netdevsim/psp.c
>  create mode 100644 tools/testing/selftests/drivers/net/psp_responder.c
>  create mode 100755 tools/testing/selftests/drivers/net/psp.py

Reviewed-by: Willem de Bruijn <[email-masked]>

Great both for coverage and as an example device implementation,
thanks.

I'll leave a few minor comments inline, but nothing that really needs
a respin and/or cannot be a minor fixup later.