netdev - [PATCH net-next] net: move xdp_prog field in RX cache lines

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Date:   Tue, 25 Apr 2017 11:36:52 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: move xdp_prog field in RX cache lines

From: Eric Dumazet <edumazet@...gle.com>

(struct net_device, xdp_prog) field should be moved in RX cache lines,
reducing latencies when a single packet is received on idle host,
since netif_elide_gro() needs it.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/netdevice.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 46d220c2bf92c9ce5e31beb2300838462ee89304..8c5c8cdc7b977250dab9cab2a508249eb3814e32 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1790,6 +1790,7 @@ struct net_device {
 	unsigned int		real_num_rx_queues;
 #endif
 
+	struct bpf_prog __rcu	*xdp_prog;
 	unsigned long		gro_flush_timeout;
 	rx_handler_func_t __rcu	*rx_handler;
 	void __rcu		*rx_handler_data;
@@ -1905,7 +1906,6 @@ struct net_device {
 	struct lock_class_key	*qdisc_tx_busylock;
 	struct lock_class_key	*qdisc_running_key;
 	bool			proto_down;
-	struct bpf_prog __rcu	*xdp_prog;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)