net: hibmcge: fix page_pool DMA direction mismatch

The driver memsets the RX buffer page head to zero before
submitting it to hardware, then calls dma_sync_single_for_device()
with DMA_TO_DEVICE.  This sync direction does not match the pool
dma_dir which is DMA_FROM_DEVICE, violating the DMA API contract
that the sync direction must match the mapping direction.

On swiotlb platforms the mismatch can cause incorrect bounce-buffer
behaviour, and CONFIG_DMA_API_DEBUG emits a warning.

Switch the page_pool dma_dir to DMA_BIDIRECTIONAL so that the
CPU-to-device memset sync becomes legal.

Fixes: c30595917585 ("net: hibmcge: add support for pagepool on rx")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Link: https://patch.msgid.link/20260820124346.4097115-1-shaojijie@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions