Re: [PATCH net-next V3 15/15] selftests: drv-net: Add PSP HW GRO conformance tests

[Daniel Zahka]

On Thu Sep 3, 2026 at 4:52 AM EDT, Tariq Toukan wrote:
> From: Cosmin Ratiu <cratiu@xxxxxxxxxx>
>
> Add PSP conformance tests using the same gro helper binary as gro.py
> does, but in --psp mode. SPIs are procured by psp_gro.py from a real PSP
> device and handed off to the gro sender & receiver. The sender crafts
> and encrypts packets in software, the receiver relies fully on the HW to
> decrypt, decapsulate and do HW GRO.
>
> Because the NIC decrypts and decapsulates before the frames reach the
> receiver AF_PACKET tap, it sees the plain frames and the assertions
> remain exactly the same as gro.py.
>
> So these tests verify, at length, that the device does PSP HW-GRO the
> same way as plain TCP.
>
> Additional PSP-specific tests are defined to check that GRO doesn't
> merge packets across PSP versions, SPIs, encryption-status, etc.
>
> Some tests from gro.py are not included because they don't work:
> - ip_csum: the checksum is recomputed by psp_dev_rcv().
> - tcp_csum: packets are marked with CHECKSUM_UNNECESSARY.
> - ip_frag4/ip_frag6: PSP is incompatible with IP fragmentation.
> - IPv6 extension header tests: PSP doesn't deal with IPv6 ext headers.
>
> Signed-off-by: Cosmin Ratiu <cratiu@xxxxxxxxxx>
> Reviewed-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
> Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxx>
> ---
>  .../testing/selftests/drivers/net/gro_lib.py  |  14 +-
>  .../testing/selftests/drivers/net/hw/Makefile |  17 ++
>  .../selftests/drivers/net/hw/psp_gro.py       | 172 ++++++++++++++++++

There's a chance I don't use the config snippets correctly, but I don't
include configs from parent directories. So maybe add CONFIG_INET_PSP=y
to ./tools/testing/selftests/drivers/net/hw/config?