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xen-netfront: rearrange netfront structure to separate tx and rx 

Keep tx and rx elements separate on different cachelines to prevent
bouncing.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeremy Fitzhardinge 2007-10-15 12:59:53 -07:00 committed by Jeff Garzik
parent e9edda697e
commit 84284d3c1d
1 changed files with 17 additions and 18 deletions
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35
drivers/net/xen-netfront.c
View File

@ -74,22 +74,12 @@ struct netfront_info {
struct napi_struct napi;
struct xen_netif_tx_front_ring tx;
struct xen_netif_rx_front_ring rx;
unsigned int evtchn;
struct xenbus_device *xbdev;
spinlock_t tx_lock;
spinlock_t rx_lock;
unsigned int evtchn;
/* Receive-ring batched refills. */
#define RX_MIN_TARGET 8
#define RX_DFL_MIN_TARGET 64
#define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256)
unsigned rx_min_target, rx_max_target, rx_target;
struct sk_buff_head rx_batch;
struct timer_list rx_refill_timer;
struct xen_netif_tx_front_ring tx;
int tx_ring_ref;
/*
* {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
@ -108,14 +98,23 @@ struct netfront_info {
grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
unsigned tx_skb_freelist;
spinlock_t rx_lock ____cacheline_aligned_in_smp;
struct xen_netif_rx_front_ring rx;
int rx_ring_ref;
/* Receive-ring batched refills. */
#define RX_MIN_TARGET 8
#define RX_DFL_MIN_TARGET 64
#define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256)
unsigned rx_min_target, rx_max_target, rx_target;
struct sk_buff_head rx_batch;
struct timer_list rx_refill_timer;
struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
grant_ref_t gref_rx_head;
grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
struct xenbus_device *xbdev;
int tx_ring_ref;
int rx_ring_ref;
unsigned long rx_pfn_array[NET_RX_RING_SIZE];
struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
struct mmu_update rx_mmu[NET_RX_RING_SIZE];