net: rps: move received_rps field to a better location

Commit 14d898f ("dev: Move received_rps counter next
to RPS members in softnet data") was unfortunate:

received_rps is dirtied by a cpu and never read by other
cpus in fast path.

Its presence in the hot RPS cache line (shared by many cpus)
is hurting RPS/RFS performance.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: edumazet

include/linux/netdevice.h

@@ -3204,6 +3204,7 @@ struct softnet_data {
 	struct softnet_data	*rps_ipi_list;
 #endif
 
+	unsigned int		received_rps;
 	bool			in_net_rx_action;
 	bool			in_napi_threaded_poll;
 
@@ -3236,7 +3237,6 @@ struct softnet_data {
 	unsigned int		cpu;
 	unsigned int		input_queue_tail;
 #endif
-	unsigned int		received_rps;
 	struct sk_buff_head	input_pkt_queue;
 	struct napi_struct	backlog;