net: microchip: fdma: use little-endian types for descriptor fields

The FDMA engine reads and writes the DCB and DB descriptors in
little-endian byte order. So far the descriptors have only been produced
by the little-endian SoC itself, so plain u64 fields were fine. With the
PCIe FDMA path, the descriptors live in host memory and are written by
the host CPU, which may be big-endian.

Change the descriptor fields to __le64 and convert at the library
boundary: in __fdma_db_add() and __fdma_dcb_add() on write, and in the
fdma_db_*() accessors on read. The dataptr and nextptr callbacks keep
their u64 signatures, so their implementations are unchanged. Add
fdma_db_dataptr_get(), and convert the lan966x sites that read the
descriptor fields directly to use the accessors.

No functional change on little-endian hosts.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260928-lan966x-pci-fdma-v9-4-a17caf60f89a@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions