net/mlx5: Add VHCA_ID page management mode support

net/mlx5: Add VHCA_ID page management mode support

Add support for VHCA_ID-based page management mode. When the device
firmware advertises the icm_mng_function_id_mode capability with
MLX5_ID_MODE_FUNCTION_VHCA_ID, page management operations between the
driver and firmware may use vhca_id instead of function_id as the
effective function identifier, and the ec_function field is ignored.

Update page management commands to conditionally set ec_function field
only in FUNC_ID mode. Boot page allocation always uses FUNC_ID mode
semantics for backward compatibility, as the capability bit is only
available after set_hca_cap(). If after set_hca_cap() VHCA_ID mode was
set, modify the tracking of the boot pages in page_root_xa to use
vhca_id too.

Add mlx5_esw_vhca_id_to_func_type() to resolve the function type in
VHCA_ID mode, enabling per-type debugfs counters. Use a dedicated
vhca_type_map xarray, to provide lockless lookup. Store the resolved
type on each fw_page at allocation time so reclaim and release paths
read it directly without any lookup.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Akiva Goldberger <agoldberger@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260506133239.276237-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>