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Message-Id: <20251008-wed-4g-ram-limitation-v1-1-16fe55e1d042@kernel.org>
Date: Wed, 08 Oct 2025 12:48:05 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, Rex Lu <rex.lu@...iatek.com>,
Daniel Pawlik <pawlik.dan@...il.com>, Matteo Croce <teknoraver@...a.com>,
Lorenzo Bianconi <lorenzo@...nel.org>
Subject: [PATCH net] net: mtk: wed: add dma mask limitation and GFP_DMA32
for device with more than 4GB DRAM
From: Rex Lu <rex.lu@...iatek.com>
Limit tx/rx buffer address to 32-bit address space for board with more
than 4GB DRAM.
Tested-by: Daniel Pawlik <pawlik.dan@...il.com>
Tested-by: Matteo Croce <teknoraver@...a.com>
Signed-off-by: Rex Lu <rex.lu@...iatek.com>
Co-developed-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/mediatek/mtk_wed.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 3dbb113b792cf00fb4f89ab20f7e7fa72ecac260..cc3f3380a9980a6525921205dc7adaf321a099ae 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -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)
+ return ret;
+
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);
---
base-commit: 07fdad3a93756b872da7b53647715c48d0f4a2d0
change-id: 20250930-wed-4g-ram-limitation-6490e7ed9d39
Best regards,
--
Lorenzo Bianconi <lorenzo@...nel.org>
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