r8169: fix accessing unset transport header

f588aa3f3718 ("net: warn if transport header was not set") added
a check that triggers a warning in r8169, see [0].

The commit referenced in the Fixes tag refers to the change from
which the patch applies cleanly, there's nothing wrong with this
commit. It seems the actual issue (not bug, because the warning
is harmless here) was introduced with e50413acc35f
("r8169: use Giant Send").

[0] https://bugzilla.kernel.org/show_bug.cgi?id=216157

Fixes: 84567637eba7 ("r8169: work around RTL8125 UDP hw bug")
Reported-by: Erhard F. <erhard_f@mailbox.org>
Tested-by: Erhard F. <erhard_f@mailbox.org>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/1b2c2b29-3dc0-f7b6-5694-97ec526d51a0@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 3098d667219244ea315c6df16277deeabec988d6..1b7fdb4f056bdabb918637b0dcf644d9571e6aa5 100644 (file)
--- 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;
        }