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r8169: remove r8169_csum_workaround

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The loop in r8169_csum_workaround is called only if in
msdn_giant_send_check a copy of the skb header needs to be made and
we don't have enough memory. Let's simply drop the packet in that case
so that we can remove r8169_csum_workaround.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2019-07-26 21:50:34 +02:00 committed by David S. Miller
parent e64e0c8974
commit 96ea772ef2
1 changed files with 2 additions and 37 deletions
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39
drivers/net/ethernet/realtek/r8169_main.c
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@ -5508,39 +5508,6 @@ static bool rtl_test_hw_pad_bug(struct rtl8169_private *tp, struct sk_buff *skb)
return skb->len < ETH_ZLEN && tp->mac_version == RTL_GIGA_MAC_VER_34;
}
static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
struct net_device *dev);
/* r8169_csum_workaround()
* The hw limites the value the transport offset. When the offset is out of the
* range, calculate the checksum by sw.
*/
static void r8169_csum_workaround(struct rtl8169_private *tp,
struct sk_buff *skb)
{
if (skb_is_gso(skb)) {
netdev_features_t features = tp->dev->features;
struct sk_buff *segs, *nskb;
features &= ~(NETIF_F_SG | NETIF_F_IPV6_CSUM | NETIF_F_TSO6);
segs = skb_gso_segment(skb, features);
if (IS_ERR(segs) || !segs)
goto drop;
do {
nskb = segs;
segs = segs->next;
nskb->next = NULL;
rtl8169_start_xmit(nskb, tp->dev);
} while (segs);
dev_consume_skb_any(skb);
} else {
drop:
tp->dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
}
}
/* msdn_giant_send_check()
* According to the document of microsoft, the TCP Pseudo Header excludes the
* packet length for IPv6 TCP large packets.
@ -5688,10 +5655,8 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
opts[0] = DescOwn;
if (rtl_chip_supports_csum_v2(tp)) {
if (!rtl8169_tso_csum_v2(tp, skb, opts)) {
r8169_csum_workaround(tp, skb);
return NETDEV_TX_OK;
}
if (!rtl8169_tso_csum_v2(tp, skb, opts))
goto err_dma_0;
} else {
rtl8169_tso_csum_v1(skb, opts);
}