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netdevice: move xdp_rxq within netdev_rx_queue

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Both struct netdev_rx_queue and struct xdp_rxq_info are cacheline
aligned. This causes extra padding before and after the xdp_rxq
member. Move the member upfront, so that it's naturally aligned.

Before:
	/* size: 256, cachelines: 4, members: 6 */
	/* sum members: 160, holes: 1, sum holes: 40 */
	/* padding: 56 */
	/* paddings: 1, sum paddings: 36 */
	/* forced alignments: 1, forced holes: 1, sum forced holes: 40 */

After:
	/* size: 192, cachelines: 3, members: 6 */
	/* padding: 32 */
	/* paddings: 1, sum paddings: 36 */
	/* forced alignments: 1 */

Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/r/20210823180135.1153608-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-08-23 11:01:35 -07:00
parent 18a9eae240
commit 95d1d2490c
1 changed files with 1 additions and 1 deletions
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2
include/linux/netdevice.h
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@ -722,13 +722,13 @@ bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
struct xdp_rxq_info xdp_rxq;
#ifdef CONFIG_RPS
struct rps_map __rcu *rps_map;
struct rps_dev_flow_table __rcu *rps_flow_table;
#endif
struct kobject kobj;
struct net_device *dev;
struct xdp_rxq_info xdp_rxq;
#ifdef CONFIG_XDP_SOCKETS
struct xsk_buff_pool *pool;
#endif