netdev - Re: [RESEND PATCH net 01/10] net: ethernet: mediatek: fix fails from TX housekeeping due to incorrect port setup

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Date:   Thu, 25 Aug 2016 14:19:49 +0200
From:   John Crispin <john@...ozen.org>
To:     Sean Wang <sean.wang@...iatek.com>, davem@...emloft.net
Cc:     nbd@...nwrt.org, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, keyhaede@...il.com
Subject: Re: [RESEND PATCH net 01/10] net: ethernet: mediatek: fix fails from
 TX housekeeping due to incorrect port setup



On 25/08/2016 12:44, Sean Wang wrote:
> 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@...iatek.com>

Acked-by: John Crispin <john@...ozen.org>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 1801fd8..6e4a6ca 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -587,14 +587,15 @@ 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));
> @@ -652,7 +653,7 @@ 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);
>