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sunvnet: don't change gso data on clones 

This patch unclones an skb for the case where the sunvnet driver needs to
change the segmentation size so that it doesn't interfere with TCP SACK's
use of them.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens 2015-02-11 08:20:17 -05:00 committed by David S. Miller
parent 1d6c4cca41
commit f7d70f7481
1 changed files with 10 additions and 13 deletions
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23
drivers/net/ethernet/sun/sunvnet.c
View File

@ -1192,23 +1192,16 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
skb_pull(skb, maclen);
if (port->tso && gso_size < datalen) {
if (skb_unclone(skb, GFP_ATOMIC))
goto out_dropped;
/* segment to TSO size */
skb_shinfo(skb)->gso_size = datalen;
skb_shinfo(skb)->gso_segs = gso_segs;
segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
/* restore gso_size & gso_segs */
skb_shinfo(skb)->gso_size = gso_size;
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen,
gso_size);
} else
segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
if (IS_ERR(segs)) {
dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
if (IS_ERR(segs))
goto out_dropped;
skb_push(skb, maclen);
skb_reset_mac_header(skb);
@ -1246,6 +1239,10 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
if (!(status & NETDEV_TX_MASK))
dev_kfree_skb_any(skb);
return status;
out_dropped:
dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)