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

On Thu Sep 3, 2026 at 4:52 AM EDT, Tariq Toukan wrote:

From: Cosmin Ratiu <redacted>

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 <redacted>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 .../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?