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gianfar: Optimize struct gfar_priv_tx_q for two cache lines

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Resize and regroup structure members to eliminate memory holes and
to pack the structure into 2 cache lines (from 3).
tx_ring_size was resized from 4 to 2 bytes and few members were re-grouped
in order to eliminate byte holes and achieve compactness.
Where possible, few members were grouped according to their usage and access
order (i.e. start_xmit vs. clean_tx_ring members), less important members
were pushed at the end.

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Claudiu Manoil 2013-01-29 03:55:10 +00:00 committed by David S. Miller
parent 243bb4c6d7
commit 0cd3fdea07
1 changed files with 13 additions and 14 deletions
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27
drivers/net/ethernet/freescale/gianfar.h
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@ -935,26 +935,25 @@ struct tx_q_stats {
* @txtime: coalescing value if based on time
*/
struct gfar_priv_tx_q {
/* cacheline 1 */
spinlock_t txlock __attribute__ ((aligned (SMP_CACHE_BYTES)));
struct sk_buff ** tx_skbuff;
/* Buffer descriptor pointers */
dma_addr_t tx_bd_dma_base;
struct txbd8 *tx_bd_base;
struct txbd8 *cur_tx;
struct txbd8 *dirty_tx;
struct tx_q_stats stats;
struct net_device *dev;
struct gfar_priv_grp *grp;
u16 skb_curtx;
u16 skb_dirtytx;
u16 qindex;
unsigned int tx_ring_size;
unsigned int num_txbdfree;
unsigned short skb_curtx;
unsigned short tx_ring_size;
struct tx_q_stats stats;
struct gfar_priv_grp *grp;
/* cacheline 2 */
struct net_device *dev;
struct sk_buff **tx_skbuff;
struct txbd8 *dirty_tx;
unsigned short skb_dirtytx;
unsigned short qindex;
/* Configuration info for the coalescing features */
unsigned char txcoalescing;
unsigned int txcoalescing;
unsigned long txic;
unsigned short txcount;
unsigned short txtime;
dma_addr_t tx_bd_dma_base;
};
/*