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

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>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index f1609542adf19a75f71cf3517deb578df5b57d1b..7fc2ff0c5bf0b9cda00b881fe7578128569e234c 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -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);