On Wed, Feb 25, 2026 at 04:19:30PM +0200, Leon Romanovsky wrote:

This series adds support for Transaction Layer Packet (TLP) emulation
response gateway regions, enabling userspace device emulation software
to write TLP responses directly to lower layers without kernel driver
involvement.

Currently, the mlx5 driver exposes VirtIO emulation access regions via
the MLX5_IB_METHOD_VAR_OBJ_ALLOC ioctl. This series extends that
ioctl to also support allocating TLP response gateway channels for
PCI device emulation use cases.

Sorry if this is obvious to people in the know, but could you possibly
give a quick high level description of the use case behind this feature?
I'm just curious what emulation needs are enabled by having access to
this packet level. Thanks!