net: pack skb_shared_info more efficiently
nr_frags can be 8 bits since 256 is plenty of fragments. This allows it to be
packed with tx_flags.
Also by moving ip6_frag_id and dataref (both 4 bytes) next to each other we can
avoid a hole between ip6_frag_id and frag_list on 64 bit systems.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f47f0c3..50db9b0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -242,15 +242,15 @@
* the end of the header data, ie. at skb->end.
*/
struct skb_shared_info {
- unsigned short nr_frags;
+ unsigned char nr_frags;
+ __u8 tx_flags;
unsigned short gso_size;
/* Warning: this field is not always filled in (UFO)! */
unsigned short gso_segs;
unsigned short gso_type;
- __be32 ip6_frag_id;
- __u8 tx_flags;
struct sk_buff *frag_list;
struct skb_shared_hwtstamps hwtstamps;
+ __be32 ip6_frag_id;
/*
* Warning : all fields before dataref are cleared in __alloc_skb()