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Message-Id: <1465108385-38286-9-git-send-email-john@phrozen.org> Date: Sun, 5 Jun 2016 08:33:01 +0200 From: John Crispin <john@...ozen.org> To: "David S. Miller" <davem@...emloft.net> Cc: Felix Fietkau <nbd@....name>, Sean Wang <keyhaede@...il.com>, netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, John Crispin <john@...ozen.org> Subject: [PATCH 08/12] net: mediatek: fix threshold value The logic to calculate the threshold value for stopping the TX queue is bad. Currently it will always use 1/2 of the rings size, which is way too much. Set the threshold to MAX_SKB_FRAGS. This makes sure that the queue is stopped when there is not enough room to accept an additional segment. Signed-off-by: John Crispin <john@...ozen.org> --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 93af4e3..8b289e1 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1012,8 +1012,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth) atomic_set(&ring->free_count, MTK_DMA_SIZE - 2); ring->next_free = &ring->dma[0]; ring->last_free = &ring->dma[MTK_DMA_SIZE - 2]; - ring->thresh = max((unsigned long)MTK_DMA_SIZE >> 2, - MAX_SKB_FRAGS); + ring->thresh = MAX_SKB_FRAGS; /* make sure that all changes to the dma ring are flushed before we * continue -- 1.7.10.4
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