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[net-next,v4,1/2] net: ethernet: mediatek: enhance RX path by reducing the frequency of the memory barrier used

Message ID 1472835407-17828-2-git-send-email-sean.wang@mediatek.com
State Superseded, archived
Delegated to: David Miller
Headers show

Commit Message

Sean Wang Sept. 2, 2016, 4:56 p.m. UTC 
From: Sean Wang <sean.wang@mediatek.com>

The patch makes move 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 shows it still can reach about 943Mbpis without
performance drop that is tested based on the setup with one port
using Giga PHY 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(-)
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Patch

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 048d763..33bb10f 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -951,13 +951,14 @@  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_PRX_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_PRX_CRX_IDX0);
 
 	if (done < budget)
 		mtk_w32(eth, MTK_RX_DONE_INT, MTK_PDMA_INT_STATUS);