netdev - RE: [PATCH net v1 1/1] net: fec: Fix Transmitted bytes counter

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Date:	Fri, 28 Jun 2013 02:11:30 +0000
From:	Duan Fugang-B38611 <B38611@...escale.com>
To:	Jim Baxter <jim_baxter@...tor.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Estevam Fabio-R49496 <r49496@...escale.com>,
	Li Frank-B20596 <B20596@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net v1 1/1] net: fec: Fix Transmitted bytes counter

On 06/28/13 02:25, Jim Baxter wrote:

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] On Behalf Of Jim Baxter
> Sent: Friday, June 28, 2013 2:25 AM
> To: David S. Miller
> Cc: Estevam Fabio-R49496; Li Frank-B20596; Shawn Guo; netdev@...r.kernel.org
> Subject: [PATCH net v1 1/1] net: fec: Fix Transmitted bytes counter
>
> The tx_bytes field was not being updated so the network card statistics showed 0.0B transmitted.
>
> Signed-off-by: Jim Baxter <jim_baxter@...tor.com>
> ---
>  drivers/net/ethernet/freescale/fec_main.c |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index ed6180e..05a5f76 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -738,6 +738,7 @@ fec_enet_tx(struct net_device *ndev)
>  				ndev->stats.tx_carrier_errors++;
>  		} else {
>  			ndev->stats.tx_packets++;
> +			ndev->stats.tx_bytes += bdp->cbd_datlen;
>  		}
>  
>  		if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS) &&
> --
You cannot stat. tx_bytes in here, since stat.tx_bytes indicate that all bytes sent by MAC regardless whether there have error packets or not.
You must add the stat. at xmit function as below:
...
fep->tx_skbuff[index] = skb;
+ ndev->stats.tx_bytes += skb->len;
...

Thanks,
Andy

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