[PATCH 4/5] net: ethernet: mediatek: enable rx path by reducing memory barrier
From: Sean Wang <sean.wang@mediatek.com>
Date: 2016-08-15 15:03:59
Also in:
netdev
Subsystem:
mediatek ethernet driver, networking drivers, the rest · Maintainers:
Felix Fietkau, Lorenzo Bianconi, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The patch makes moving wmb() to outside the loop that could help rx path handling more faster although that rx descriptors aren't freed for DMA to use as soon as possible, but based on my experiment and the result show it still can reach about 943Mbpis tested on the setup with one port using gigaphy and 256 rx descriptors for DMA to move. Signed-off-by: Sean Wang <sean.wang@mediatek.com> --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index b782330..53e24c1 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c@@ -893,14 +893,15 @@ release_desc: rxd->rxd2 = RX_DMA_PLEN0(ring->buf_size); ring->calc_idx = idx; - /* make sure that all changes to the dma ring are flushed before - * we continue - */ - wmb(); - mtk_w32(eth, ring->calc_idx, MTK_QRX_CRX_IDX0); done++; } + /* make sure that all changes to the dma ring are flushed before + * we continue + */ + wmb(); + mtk_w32(eth, ring->calc_idx, MTK_QRX_CRX_IDX0); + if (done < budget) mtk_w32(eth, MTK_RX_DONE_INT, MTK_QMTK_INT_STATUS);
--
1.7.9.5