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45 lines
1.3 KiB
Diff
45 lines
1.3 KiB
Diff
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From: Felix Fietkau <nbd@nbd.name>
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Date: Thu, 27 Aug 2020 09:24:25 +0200
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Subject: [PATCH] net: ethernet: mtk_eth_soc: only read the full rx
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descriptor if DMA is done
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Uncached memory access is expensive, and there is no need to access all
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descriptor words if we can't process them anyway
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -776,13 +776,18 @@ static inline int mtk_max_buf_size(int f
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return buf_size;
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}
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-static inline void mtk_rx_get_desc(struct mtk_rx_dma *rxd,
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+static inline bool mtk_rx_get_desc(struct mtk_rx_dma *rxd,
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struct mtk_rx_dma *dma_rxd)
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{
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- rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
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rxd->rxd2 = READ_ONCE(dma_rxd->rxd2);
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+ if (!(rxd->rxd2 & RX_DMA_DONE))
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+ return false;
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+
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+ rxd->rxd1 = READ_ONCE(dma_rxd->rxd1);
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rxd->rxd3 = READ_ONCE(dma_rxd->rxd3);
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rxd->rxd4 = READ_ONCE(dma_rxd->rxd4);
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+
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+ return true;
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}
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/* the qdma core needs scratch memory to be setup */
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@@ -1254,8 +1259,7 @@ static int mtk_poll_rx(struct napi_struc
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rxd = &ring->dma[idx];
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data = ring->data[idx];
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- mtk_rx_get_desc(&trxd, rxd);
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- if (!(trxd.rxd2 & RX_DMA_DONE))
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+ if (!mtk_rx_get_desc(&trxd, rxd))
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break;
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/* find out which mac the packet come from. values start at 1 */
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