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From 4742349c1595d38b3e3b463e66cf21af4217c869 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Thu, 7 Apr 2016 17:36:23 +0200
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Subject: [PATCH 069/102] net: mediatek: do not set the QID field in the TX
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DMA descriptors
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The QID field gets set to the mac id. This made the DMA linked list queue
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the traffic of each MAC on a different internal queue. However during long
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term testing we found that this will cause traffic stalls as the multi
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queue setup requires a more complete initialisation which is not part of
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the upstream driver yet.
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This patch removes the code setting the QID field, resulting in all
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traffic ending up in queue 0 which works without any special setup.
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Signed-off-by: John Crispin <blogic@openwrt.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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@@ -603,8 +603,7 @@ static int mtk_tx_map(struct sk_buff *sk
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WRITE_ONCE(txd->txd1, mapped_addr);
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WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
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TX_DMA_PLEN0(frag_map_size) |
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- last_frag * TX_DMA_LS0) |
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- mac->id);
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+ last_frag * TX_DMA_LS0));
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WRITE_ONCE(txd->txd4, 0);
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tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
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