net: add skb_set_end_offset() helper

We have multiple places where this helper is convenient,
and plan using it in the following patch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a3e90ef..115be7f 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1536,6 +1536,11 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb)
 {
        return skb->end;
 }
+
+static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
+{
+       skb->end = offset;
+}
 #else
 static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
 {
@@ -1546,6 +1551,11 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb)
 {
        return skb->end - skb->head;
 }
+
+static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
+{
+       skb->end = skb->head + offset;
+}
 #endif
 
 /* Internal */

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9d0388b..27a2296 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -201,7 +201,7 @@ static void __build_skb_around(struct sk_buff *skb, void *data,
        skb->head = data;
        skb->data = data;
        skb_reset_tail_pointer(skb);
-       skb->end = skb->tail + size;
+       skb_set_end_offset(skb, size);
        skb->mac_header = (typeof(skb->mac_header))~0U;
        skb->transport_header = (typeof(skb->transport_header))~0U;
 
@@ -1736,11 +1736,10 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
        skb->head     = data;
        skb->head_frag = 0;
        skb->data    += off;
+
+       skb_set_end_offset(skb, size);
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end      = size;
        off           = nhead;
-#else
-       skb->end      = skb->head + size;
 #endif
        skb->tail             += off;
        skb_headers_offset_update(skb, nhead);
@@ -6044,11 +6043,7 @@ static int pskb_carve_inside_header(struct sk_buff *skb, const u32 off,
        skb->head = data;
        skb->data = data;
        skb->head_frag = 0;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end = size;
-#else
-       skb->end = skb->head + size;
-#endif
+       skb_set_end_offset(skb, size);
        skb_set_tail_pointer(skb, skb_headlen(skb));
        skb_headers_offset_update(skb, 0);
        skb->cloned = 0;
@@ -6186,11 +6181,7 @@ static int pskb_carve_inside_nonlinear(struct sk_buff *skb, const u32 off,
        skb->head = data;
        skb->head_frag = 0;
        skb->data = data;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end = size;
-#else
-       skb->end = skb->head + size;
-#endif
+       skb_set_end_offset(skb, size);
        skb_reset_tail_pointer(skb);
        skb_headers_offset_update(skb, 0);
        skb->cloned   = 0;