#include <asm/system.h>
#include <linux/bitops.h>
#include <linux/capability.h>
-#include <linux/config.h>
#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
/**
* skb_gso_segment - Perform segmentation on skb.
* @skb: buffer to segment
- * @sg: whether scatter-gather is supported on the target.
+ * @features: features for the output path (see dev->features)
*
* This function segments the given skb and returns a list of segments.
+ *
+ * It may return NULL if the skb requires no segmentation. This is
+ * only possible when GSO is used for verifying header integrity.
*/
-struct sk_buff *skb_gso_segment(struct sk_buff *skb, int sg)
+struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
{
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
struct packet_type *ptype;
rcu_read_lock();
list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
- segs = ptype->gso_segment(skb, sg);
+ segs = ptype->gso_segment(skb, features);
break;
}
}
rcu_read_unlock();
+ __skb_push(skb, skb->data - skb->mac.raw);
+
return segs;
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif
-#ifdef CONFIG_HIGHMEM
/* Actually, we should eliminate this check as soon as we know, that:
* 1. IOMMU is present and allows to map all the memory.
* 2. No high memory really exists on this machine.
static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
{
+#ifdef CONFIG_HIGHMEM
int i;
if (dev->features & NETIF_F_HIGHDMA)
if (PageHighMem(skb_shinfo(skb)->frags[i].page))
return 1;
+#endif
return 0;
}
-#else
-#define illegal_highdma(dev, skb) (0)
-#endif
struct dev_gso_cb {
void (*destructor)(struct sk_buff *skb);
{
struct net_device *dev = skb->dev;
struct sk_buff *segs;
+ int features = dev->features & ~(illegal_highdma(dev, skb) ?
+ NETIF_F_SG : 0);
+
+ segs = skb_gso_segment(skb, features);
+
+ /* Verifying header integrity only. */
+ if (!segs)
+ return 0;
- segs = skb_gso_segment(skb, dev->features & NETIF_F_SG &&
- !illegal_highdma(dev, skb));
if (unlikely(IS_ERR(segs)))
return PTR_ERR(segs);
if (netdev_nit)
dev_queue_xmit_nit(skb, dev);
- if (!netif_needs_gso(dev, skb))
- return dev->hard_start_xmit(skb, dev);
+ if (netif_needs_gso(dev, skb)) {
+ if (unlikely(dev_gso_segment(skb)))
+ goto out_kfree_skb;
+ if (skb->next)
+ goto gso;
+ }
- if (unlikely(dev_gso_segment(skb)))
- goto out_kfree_skb;
+ return dev->hard_start_xmit(skb, dev);
}
+gso:
do {
struct sk_buff *nskb = skb->next;
int rc;
if (dev->qdisc_ingress) {
__u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
if (MAX_RED_LOOP < ttl++) {
- printk("Redir loop detected Dropping packet (%s->%s)\n",
+ printk(KERN_WARNING "Redir loop detected Dropping packet (%s->%s)\n",
skb->input_dev->name, skb->dev->name);
return TC_ACT_SHOT;
}
/* Fix illegal SG+CSUM combinations. */
if ((dev->features & NETIF_F_SG) &&
!(dev->features & NETIF_F_ALL_CSUM)) {
- printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
+ printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
dev->name);
dev->features &= ~NETIF_F_SG;
}
/* TSO requires that SG is present as well. */
if ((dev->features & NETIF_F_TSO) &&
!(dev->features & NETIF_F_SG)) {
- printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
+ printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
dev->name);
dev->features &= ~NETIF_F_TSO;
}