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From 34ea0f209e0759158e363039852a04b1facc3acd Mon Sep 17 00:00:00 2001
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From: John Crispin <john@phrozen.org>
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Date: Tue, 3 May 2016 02:55:27 +0200
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Subject: [PATCH 088/102] net-next: mediatek: fix threshold value
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The logic to calculate the threshold value for stopping the TX queue is
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bad. Currently it will always use 1/2 of the rings size, which is way too
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much. Set the threshold to MAX_SKB_FRAGS. This makes sure that the queue
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is stopped when there is not enough room to accept an additional segment.
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Signed-off-by: John Crispin <john@phrozen.org>
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---
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drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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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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@@ -1043,8 +1043,7 @@ static int mtk_tx_alloc(struct mtk_eth *
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atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
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ring->next_free = &ring->dma[0];
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ring->last_free = &ring->dma[MTK_DMA_SIZE - 2];
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- ring->thresh = max((unsigned long)MTK_DMA_SIZE >> 2,
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- MAX_SKB_FRAGS);
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+ ring->thresh = MAX_SKB_FRAGS;
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/* make sure that all changes to the dma ring are flushed before we
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* continue
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