net: cacheline adjust struct inet_frag_queue

Fragmentation code cacheline adjusting of struct inet_frag_queue.

Take advantage of the size of struct timer_list, and move all but
spinlock_t lock, below the timer struct.  On 64-bit 'lru_list',
'list' and 'refcnt', fits exactly into the next cacheline, and a
new cacheline starts at 'fragments'.

The netns_frags *net pointer is moved to the end of the struct,
because its used in a compare, with "next/close-by" elements of
which this struct is embedded into.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 54c1de781c68..8e4c42523f59 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -16,12 +16,11 @@ struct netns_frags {
 };
 
 struct inet_frag_queue {
-        struct hlist_node       list;
-        struct netns_frags      *net;
-        struct list_head        lru_list;   /* lru list member */
         spinlock_t              lock;
-        atomic_t                refcnt;
         struct timer_list       timer;      /* when will this queue expire? */
+        struct list_head        lru_list;   /* lru list member */
+        struct hlist_node       list;
+        atomic_t                refcnt;
         struct sk_buff          *fragments; /* list of received fragments */
         struct sk_buff          *fragments_tail;
         ktime_t                 stamp;
@@ -34,6 +33,8 @@ struct inet_frag_queue {
 #define INET_FRAG_LAST_IN       1
 
         u16                     max_size;
+
+        struct netns_frags      *net;
 };
 
 #define INETFRAGS_HASHSZ                64