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-rw-r--r--target/linux/mediatek/patches-4.4/0088-net-next-mediatek-fix-threshold-value.patch35
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-4.4/0088-net-next-mediatek-fix-threshold-value.patch b/target/linux/mediatek/patches-4.4/0088-net-next-mediatek-fix-threshold-value.patch
new file mode 100644
index 0000000000..2a8fc33fa2
--- /dev/null
+++ b/target/linux/mediatek/patches-4.4/0088-net-next-mediatek-fix-threshold-value.patch
@@ -0,0 +1,35 @@
+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(-)
+
+diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+index ec6140f..d03f339 100644
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -1043,8 +1043,7 @@ 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
+