[LRO]: fix lro_gen_skb() alignment

Add a field to the lro_mgr struct so that drivers can specify how much
padding is required to align layer 3 headers when a packet is copied
into a freshly allocated skb by inet_lro.c:lro_gen_skb().  Without
padding, skbs generated by LRO will cause alignment warnings on
architectures which require strict alignment (seen on sparc64).

Myri10GE is updated to use this field.

Signed-off-by: Andrew Gallatin <gallatin@myri.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/inet_lro.h b/include/linux/inet_lro.h
index 1246d46abbc0..80335b7d77c5 100644
--- a/include/linux/inet_lro.h
+++ b/include/linux/inet_lro.h
@@ -91,6 +91,9 @@ struct net_lro_mgr {
         int max_desc; /* Max number of LRO descriptors  */
         int max_aggr; /* Max number of LRO packets to be aggregated */
 
+        int frag_align_pad; /* Padding required to properly align layer 3
+                             * headers in generated skb when using frags */
+
         struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
 
         /*