netdev - RE: [PATCH] dpaa_eth: copy timestamp fields to new skb in A-050385 workaround

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Date:   Wed, 2 Dec 2020 13:17:46 +0000
From:   Camelia Alexandra Groza <camelia.groza@....com>
To:     "Y.b. Lu" <yangbo.lu@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Madalin Bucur <madalin.bucur@....com>,
        "David S . Miller" <davem@...emloft.net>
Subject: RE: [PATCH] dpaa_eth: copy timestamp fields to new skb in A-050385
 workaround

> -----Original Message-----
> From: Yangbo Lu <yangbo.lu@....com>
> Sent: Tuesday, December 1, 2020 09:53
> To: netdev@...r.kernel.org
> Cc: Y.b. Lu <yangbo.lu@....com>; Madalin Bucur
> <madalin.bucur@....com>; David S . Miller <davem@...emloft.net>
> Subject: [PATCH] dpaa_eth: copy timestamp fields to new skb in A-050385
> workaround
> 
> The timestamp fields should be copied to new skb too in
> A-050385 workaround for later TX timestamping handling.
> 
> Fixes: 3c68b8fffb48 ("dpaa_eth: FMan erratum A050385 workaround")
> Signed-off-by: Yangbo Lu <yangbo.lu@....com>
> ---

Acked-by: Camelia Groza <camelia.groza@....com>

>  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> index d9c2859..cb7c028 100644
> --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> @@ -2120,6 +2120,15 @@ static int dpaa_a050385_wa(struct net_device
> *net_dev, struct sk_buff **s)
>  	skb_copy_header(new_skb, skb);
>  	new_skb->dev = skb->dev;
> 
> +	/* Copy relevant timestamp info from the old skb to the new */
> +	if (priv->tx_tstamp) {
> +		skb_shinfo(new_skb)->tx_flags = skb_shinfo(skb)->tx_flags;
> +		skb_shinfo(new_skb)->hwtstamps = skb_shinfo(skb)-
> >hwtstamps;
> +		skb_shinfo(new_skb)->tskey = skb_shinfo(skb)->tskey;
> +		if (skb->sk)
> +			skb_set_owner_w(new_skb, skb->sk);
> +	}
> +
>  	/* We move the headroom when we align it so we have to reset the
>  	 * network and transport header offsets relative to the new data
>  	 * pointer. The checksum offload relies on these offsets.
> @@ -2127,7 +2136,6 @@ static int dpaa_a050385_wa(struct net_device
> *net_dev, struct sk_buff **s)
>  	skb_set_network_header(new_skb, skb_network_offset(skb));
>  	skb_set_transport_header(new_skb, skb_transport_offset(skb));
> 
> -	/* TODO: does timestamping need the result in the old skb? */
>  	dev_kfree_skb(skb);
>  	*s = new_skb;
> 
> --
> 2.7.4