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net: hibmcge: fix page_pool DMA direction mismatch

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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: c305959175 ("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>
This commit is contained in:
Jian Shen 2026-08-20 20:43:46 +08:00 committed by Jakub Kicinski
parent 137b8ae233
commit 11efd7963d
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/hisilicon/hibmcge/hbg_txrx.c
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@ -554,7 +554,7 @@ static int hbg_ring_page_pool_init(struct hbg_priv *priv, struct hbg_ring *ring)
.nid = dev_to_node(&priv->pdev->dev),
.dev = &priv->pdev->dev,
.napi = &ring->napi,
.dma_dir = DMA_FROM_DEVICE,
.dma_dir = DMA_BIDIRECTIONAL,
.offset = 0,
.max_len = hbg_get_page_size(ring),
};