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ag71xx: Reorder ag71xx struct members for better cache performance 

Qualcomm claims this improves the D-cache footprint. Origina commit message below:

From: Ben Menchaca <ben.menchaca@qca.qualcomm.com>
Date: Fri, 7 Jun 2013 10:57:28 -0500
Subject: [ag71xx] cluster/align structs for cache perf

Cluster the frequently used, per-packet structures in ag71xx near
to each other, and cacheline-align them.  Some other re-ordering
occurred to move "warmer" structures near the per-packet structures.

Signed-off-by: Ben Menchaca <ben.menchaca@qca.qualcomm.com>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
owl
Rosen Penev 2017-12-04 11:40:23 -08:00 committed by Felix Fietkau
parent cde71a543c
commit 4e03a742e0
1 changed files with 17 additions and 10 deletions
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27
target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
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@ -153,20 +153,31 @@ struct ag71xx_debug {
};
struct ag71xx {
void __iomem *mac_base;
/*
* Critical data related to the per-packet data path are clustered
* early in this structure to help improve the D-cache footprint.
*/
struct ag71xx_ring rx_ring ____cacheline_aligned;
struct ag71xx_ring tx_ring ____cacheline_aligned;
unsigned int max_frame_len;
unsigned int desc_pktlen_mask;
unsigned int rx_buf_size;
spinlock_t lock;
struct platform_device *pdev;
struct net_device *dev;
struct platform_device *pdev;
spinlock_t lock;
struct napi_struct napi;
u32 msg_enable;
/*
* From this point onwards we're not looking at per-packet fields.
*/
void __iomem *mac_base;
struct ag71xx_desc *stop_desc;
dma_addr_t stop_desc_dma;
struct ag71xx_ring rx_ring;
struct ag71xx_ring tx_ring;
struct mii_bus *mii_bus;
struct phy_device *phy_dev;
void *phy_priv;
@ -175,10 +186,6 @@ struct ag71xx {
unsigned int speed;
int duplex;
unsigned int max_frame_len;
unsigned int desc_pktlen_mask;
unsigned int rx_buf_size;
struct delayed_work restart_work;
struct delayed_work link_work;
struct timer_list oom_timer;