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net: mtk: wed: add dma mask limitation and GFP_DMA32 for device with more than 4GB DRAM

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Limit tx/rx buffer address to 32-bit address space for board with more
than 4GB DRAM.

Fixes: 804775dfc2 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
Fixes: 6757d345dd ("net: ethernet: mtk_wed: introduce hw_rro support for MT7988")
Tested-by: Daniel Pawlik <pawlik.dan@gmail.com>
Tested-by: Matteo Croce <teknoraver@meta.com>
Signed-off-by: Rex Lu <rex.lu@mediatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rex Lu 2025-10-09 08:29:34 +02:00 • committed by David S. Miller
parent d5d790ba15
commit 3abc0e55ea
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
drivers/net/ethernet/mediatek/mtk_wed.c
View file

@ -677,7 +677,7 @@ mtk_wed_tx_buffer_alloc(struct mtk_wed_device *dev)
void *buf;
int s;
page = __dev_alloc_page(GFP_KERNEL);
page = __dev_alloc_page(GFP_KERNEL | GFP_DMA32);
if (!page)
return -ENOMEM;
@ -800,7 +800,7 @@ mtk_wed_hwrro_buffer_alloc(struct mtk_wed_device *dev)
struct page *page;
int s;
page = __dev_alloc_page(GFP_KERNEL);
page = __dev_alloc_page(GFP_KERNEL | GFP_DMA32);
if (!page)
return -ENOMEM;
@ -2426,6 +2426,10 @@ mtk_wed_attach(struct mtk_wed_device *dev)
dev->version = hw->version;
dev->hw->pcie_base = mtk_wed_get_pcie_base(dev);
ret = dma_set_mask_and_coherent(hw->dev, DMA_BIT_MASK(32));
if (ret)
goto out;
if (hw->eth->dma_dev == hw->eth->dev &&
of_dma_is_coherent(hw->eth->dev->of_node))
mtk_eth_set_dma_device(hw->eth, hw->dev);