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Date:   Tue, 05 Jul 2022 14:46:14 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Erhard F." <erhard_f@...lbox.org>
Subject: Re: [PATCH net] r8169: fix accessing unset transport header

On Mon, 2022-07-04 at 00:12 +0200, Heiner Kallweit wrote:
> 66e4c8d95008 ("net: warn if transport header was not set") added
> a check that triggers a warning in r8169, see [0].
> 
> [0] https://bugzilla.kernel.org/show_bug.cgi?id=216157
> 
> Fixes: 8d520b4de3ed ("r8169: work around RTL8125 UDP hw bug")
> Reported-by: Erhard F. <erhard_f@...lbox.org>
> Tested-by: Erhard F. <erhard_f@...lbox.org>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

The patch LGTM, but I think you could mention in the commit message
that the bug was [likely] introduced with commit bdfa4ed68187 ("r8169:
use Giant Send"), but this change applies only on top of the commit
specified by the fixes tag - just to help stable teams.

Thanks!

Paolo

> ---
>  drivers/net/ethernet/realtek/r8169_main.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 3098d6672..1b7fdb4f0 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -4190,7 +4190,6 @@ static void rtl8169_tso_csum_v1(struct sk_buff *skb, u32 *opts)
>  static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
>  				struct sk_buff *skb, u32 *opts)
>  {
> -	u32 transport_offset = (u32)skb_transport_offset(skb);
>  	struct skb_shared_info *shinfo = skb_shinfo(skb);
>  	u32 mss = shinfo->gso_size;
>  
> @@ -4207,7 +4206,7 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
>  			WARN_ON_ONCE(1);
>  		}
>  
> -		opts[0] |= transport_offset << GTTCPHO_SHIFT;
> +		opts[0] |= skb_transport_offset(skb) << GTTCPHO_SHIFT;
>  		opts[1] |= mss << TD1_MSS_SHIFT;
>  	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
>  		u8 ip_protocol;
> @@ -4235,7 +4234,7 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
>  		else
>  			WARN_ON_ONCE(1);
>  
> -		opts[1] |= transport_offset << TCPHO_SHIFT;
> +		opts[1] |= skb_transport_offset(skb) << TCPHO_SHIFT;
>  	} else {
>  		unsigned int padto = rtl_quirk_packet_padto(tp, skb);
>  
> @@ -4402,14 +4401,13 @@ static netdev_features_t rtl8169_features_check(struct sk_buff *skb,
>  						struct net_device *dev,
>  						netdev_features_t features)
>  {
> -	int transport_offset = skb_transport_offset(skb);
>  	struct rtl8169_private *tp = netdev_priv(dev);
>  
>  	if (skb_is_gso(skb)) {
>  		if (tp->mac_version == RTL_GIGA_MAC_VER_34)
>  			features = rtl8168evl_fix_tso(skb, features);
>  
> -		if (transport_offset > GTTCPHO_MAX &&
> +		if (skb_transport_offset(skb) > GTTCPHO_MAX &&
>  		    rtl_chip_supports_csum_v2(tp))
>  			features &= ~NETIF_F_ALL_TSO;
>  	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
> @@ -4420,7 +4418,7 @@ static netdev_features_t rtl8169_features_check(struct sk_buff *skb,
>  		if (rtl_quirk_packet_padto(tp, skb))
>  			features &= ~NETIF_F_CSUM_MASK;
>  
> -		if (transport_offset > TCPHO_MAX &&
> +		if (skb_transport_offset(skb) > TCPHO_MAX &&
>  		    rtl_chip_supports_csum_v2(tp))
>  			features &= ~NETIF_F_CSUM_MASK;
>  	}

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