sk_buff: allow segmenting based on frag sizes
This patch allows segmenting a skb based on its frags sizes instead of
based on a fixed value.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ee38a41..329a0a9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -301,6 +301,11 @@
#endif
extern int sysctl_max_skb_frags;
+/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
+ * segment using its current segmentation instead.
+ */
+#define GSO_BY_FRAGS 0xFFFF
+
typedef struct skb_frag_struct skb_frag_t;
struct skb_frag_struct {
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4724bcf..97c32c7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3116,9 +3116,13 @@
int hsize;
int size;
- len = head_skb->len - offset;
- if (len > mss)
- len = mss;
+ if (unlikely(mss == GSO_BY_FRAGS)) {
+ len = list_skb->len;
+ } else {
+ len = head_skb->len - offset;
+ if (len > mss)
+ len = mss;
+ }
hsize = skb_headlen(head_skb) - offset;
if (hsize < 0)