---

yaml --- r: 278344 b: refs/heads/master c: 117632e h: refs/heads/master v: v3
git-mirror · Dec 4, 2011 · a85efd9 · a85efd9
1 parent 578abba
commit a85efd9
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Showing 4 changed files with 25 additions and 9 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c2e4e25afcc8ae1835a6100089f1f9fd3a362430
+refs/heads/master: 117632e64d2a5f464e491fe221d7169a3814a77b
diff --git a/trunk/include/linux/skbuff.h b/trunk/include/linux/skbuff.h
@@ -568,8 +568,9 @@ extern struct sk_buff *skb_clone(struct sk_buff *skb,
 				 gfp_t priority);
 extern struct sk_buff *skb_copy(const struct sk_buff *skb,
 				gfp_t priority);
-extern struct sk_buff *pskb_copy(struct sk_buff *skb,
-				 gfp_t gfp_mask);
+extern struct sk_buff *__pskb_copy(struct sk_buff *skb,
+				 int headroom, gfp_t gfp_mask);
+
 extern int	       pskb_expand_head(struct sk_buff *skb,
 					int nhead, int ntail,
 					gfp_t gfp_mask);
@@ -1799,6 +1800,12 @@ static inline dma_addr_t skb_frag_dma_map(struct device *dev,
 			    frag->page_offset + offset, size, dir);
 }
 
+static inline struct sk_buff *pskb_copy(struct sk_buff *skb,
+					gfp_t gfp_mask)
+{
+	return __pskb_copy(skb, skb_headroom(skb), gfp_mask);
+}
+
 /**
  *	skb_clone_writable - is the header of a clone writable
  *	@skb: buffer to check

diff --git a/trunk/net/core/skbuff.c b/trunk/net/core/skbuff.c
@@ -840,8 +840,9 @@ struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask)
 EXPORT_SYMBOL(skb_copy);
 
 /**
- *	pskb_copy	-	create copy of an sk_buff with private head.
+ *	__pskb_copy	-	create copy of an sk_buff with private head.
  *	@skb: buffer to copy
+ *	@headroom: headroom of new skb
  *	@gfp_mask: allocation priority
  *
  *	Make a copy of both an &sk_buff and part of its data, located
@@ -852,16 +853,16 @@ EXPORT_SYMBOL(skb_copy);
  *	The returned buffer has a reference count of 1.
  */
 
-struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
+struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask)
 {
-	unsigned int size = skb_end_pointer(skb) - skb->head;
+	unsigned int size = skb_headlen(skb) + headroom;
 	struct sk_buff *n = alloc_skb(size, gfp_mask);
 
 	if (!n)
 		goto out;
 
 	/* Set the data pointer */
-	skb_reserve(n, skb_headroom(skb));
+	skb_reserve(n, headroom);
 	/* Set the tail pointer and length */
 	skb_put(n, skb_headlen(skb));
 	/* Copy the bytes */
@@ -897,7 +898,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
 out:
 	return n;
 }
-EXPORT_SYMBOL(pskb_copy);
+EXPORT_SYMBOL(__pskb_copy);
 
 /**
  *	pskb_expand_head - reallocate header of &sk_buff

diff --git a/trunk/net/ipv4/tcp_output.c b/trunk/net/ipv4/tcp_output.c
@@ -2147,7 +2147,15 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb)
 	 */
 	TCP_SKB_CB(skb)->when = tcp_time_stamp;
 
-	err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
+	/* make sure skb->data is aligned on arches that require it */
+	if (unlikely(NET_IP_ALIGN && ((unsigned long)skb->data & 3))) {
+		struct sk_buff *nskb = __pskb_copy(skb, MAX_TCP_HEADER,
+						   GFP_ATOMIC);
+		err = nskb ? tcp_transmit_skb(sk, nskb, 0, GFP_ATOMIC) :
+			     -ENOBUFS;
+	} else {
+		err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
+	}
 
 	if (err == 0) {
 		/* Update global TCP statistics. */