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net: ethernet: mediatek: fix fails from TX housekeeping due to incorrect port setup

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which net device the SKB is complete for depends on the forward port
on txd4 on the corresponding TX descriptor, but the information isn't
set up well in case of  SKB fragments that would lead to watchdog timeout
from the upper layer, so fix it up.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sean Wang 2016-09-01 10:47:27 +08:00 committed by David S. Miller
parent 9264251ee2
commit c6f1dc4d9c
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@ -588,14 +588,15 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
dma_addr_t mapped_addr;
unsigned int nr_frags;
int i, n_desc = 1;
u32 txd4 = 0;
u32 txd4 = 0, fport;
itxd = ring->next_free;
if (itxd == ring->last_free)
return -ENOMEM;
/* set the forward port */
txd4 |= (mac->id + 1) << TX_DMA_FPORT_SHIFT;
fport = (mac->id + 1) << TX_DMA_FPORT_SHIFT;
txd4 |= fport;
tx_buf = mtk_desc_to_tx_buf(ring, itxd);
memset(tx_buf, 0, sizeof(*tx_buf));
@ -653,7 +654,7 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
WRITE_ONCE(txd->txd3, (TX_DMA_SWC |
TX_DMA_PLEN0(frag_map_size) |
last_frag * TX_DMA_LS0));
WRITE_ONCE(txd->txd4, 0);
WRITE_ONCE(txd->txd4, fport);
tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
tx_buf = mtk_desc_to_tx_buf(ring, txd);