From: Eric Dumazet <edumazet@google.com>
Date: Tue, 25 Apr 2017 18:36:52 +0000 (-0700)
Subject: net: move xdp_prog field in RX cache lines
X-Git-Tag: v6.6-pxa1908~16785^2~83
X-Git-Url: https://git.dujemihanovic.xyz/?a=commitdiff_plain;h=7acedaf5c4355f812cfef883ac28bf15f7d9205e;p=linux.git

net: move xdp_prog field in RX cache lines

(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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 46d220c2bf92..8c5c8cdc7b97 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)