2016-05-23 09:20:20 +00:00
|
|
|
|
From 34ea0f209e0759158e363039852a04b1facc3acd Mon Sep 17 00:00:00 2001
|
|
|
|
|
|
From: John Crispin <john@phrozen.org>
|
|
|
|
|
|
Date: Tue, 3 May 2016 02:55:27 +0200
|
|
|
|
|
|
Subject: [PATCH 088/102] net-next: mediatek: fix threshold value
|
|
|
|
|
|
MIME-Version: 1.0
|
|
|
|
|
|
Content-Type: text/plain; charset=UTF-8
|
|
|
|
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
|
|
|
|
|
|
|
|
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@phrozen.org>
|
|
|
|
|
|
---
|
|
|
|
|
|
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +--
|
|
|
|
|
|
1 file changed, 1 insertion(+), 2 deletions(-)
|
|
|
|
|
|
|
|
|
|
|
|
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
|
|
|
|
|
|
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
|
2016-06-02 13:34:34 +00:00
|
|
|
|
@@ -1043,8 +1043,7 @@ static int mtk_tx_alloc(struct mtk_eth *
|
2016-05-23 09:20:20 +00:00
|
|
|
|
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
|
