[NET]: Clean up skb_linearize

The linearisation operation doesn't need to be super-optimised.  So we can
replace __skb_linearize with __pskb_pull_tail which does the same thing but
is more general.

Also, most users of skb_linearize end up testing whether the skb is linear
or not so it helps to make skb_linearize do just that.

Some callers of skb_linearize also use it to copy cloned data, so it's
useful to have a new function skb_linearize_cow to copy the data if it's
either non-linear or cloned.

Last but not least, I've removed the gfp argument since nobody uses it
anymore.  If it's ever needed we can easily add it back.

Misc bugs fixed by this patch:

* via-velocity error handling (also, no SG => no frags)

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 61 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 1b09f1c..91361bc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1222,64 +1222,6 @@ static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
 #define illegal_highdma(dev, skb)	(0)
 #endif
 
-/* Keep head the same: replace data */
-int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask)
-{
-	unsigned int size;
-	u8 *data;
-	long offset;
-	struct skb_shared_info *ninfo;
-	int headerlen = skb->data - skb->head;
-	int expand = (skb->tail + skb->data_len) - skb->end;
-
-	if (skb_shared(skb))
-		BUG();
-
-	if (expand <= 0)
-		expand = 0;
-
-	size = skb->end - skb->head + expand;
-	size = SKB_DATA_ALIGN(size);
-	data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
-	if (!data)
-		return -ENOMEM;
-
-	/* Copy entire thing */
-	if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
-		BUG();
-
-	/* Set up shinfo */
-	ninfo = (struct skb_shared_info*)(data + size);
-	atomic_set(&ninfo->dataref, 1);
-	ninfo->tso_size = skb_shinfo(skb)->tso_size;
-	ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
-	ninfo->nr_frags = 0;
-	ninfo->frag_list = NULL;
-
-	/* Offset between the two in bytes */
-	offset = data - skb->head;
-
-	/* Free old data. */
-	skb_release_data(skb);
-
-	skb->head = data;
-	skb->end  = data + size;
-
-	/* Set up new pointers */
-	skb->h.raw   += offset;
-	skb->nh.raw  += offset;
-	skb->mac.raw += offset;
-	skb->tail    += offset;
-	skb->data    += offset;
-
-	/* We are no longer a clone, even if we were. */
-	skb->cloned    = 0;
-
-	skb->tail     += skb->data_len;
-	skb->data_len  = 0;
-	return 0;
-}
-
 #define HARD_TX_LOCK(dev, cpu) {			\
 	if ((dev->features & NETIF_F_LLTX) == 0) {	\
 		netif_tx_lock(dev);			\
@@ -1326,7 +1268,7 @@ int dev_queue_xmit(struct sk_buff *skb)
 
 	if (skb_shinfo(skb)->frag_list &&
 	    !(dev->features & NETIF_F_FRAGLIST) &&
-	    __skb_linearize(skb, GFP_ATOMIC))
+	    __skb_linearize(skb))
 		goto out_kfree_skb;
 
 	/* Fragmented skb is linearized if device does not support SG,
@@ -1335,7 +1277,7 @@ int dev_queue_xmit(struct sk_buff *skb)
 	 */
 	if (skb_shinfo(skb)->nr_frags &&
 	    (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
-	    __skb_linearize(skb, GFP_ATOMIC))
+	    __skb_linearize(skb))
 		goto out_kfree_skb;
 
 	/* If packet is not checksummed and device does not support
@@ -3473,7 +3415,6 @@ subsys_initcall(net_dev_init);
 EXPORT_SYMBOL(__dev_get_by_index);
 EXPORT_SYMBOL(__dev_get_by_name);
 EXPORT_SYMBOL(__dev_remove_pack);
-EXPORT_SYMBOL(__skb_linearize);
 EXPORT_SYMBOL(dev_valid_name);
 EXPORT_SYMBOL(dev_add_pack);
 EXPORT_SYMBOL(dev_alloc_name);