From f7d70f74811f5a522885b2962edeccb417e950c7 Mon Sep 17 00:00:00 2001 From: David L Stevens Date: Wed, 11 Feb 2015 08:20:17 -0500 Subject: [PATCH] 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 Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- drivers/net/ethernet/sun/sunvnet.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c index 2b10b85d8a08..22e0cad1b4b5 100644 --- a/drivers/net/ethernet/sun/sunvnet.c +++ b/drivers/net/ethernet/sun/sunvnet.c @@ -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) -- GitLab