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authorJeremy Fitzhardinge <jeremy@goop.org>2007-10-15 12:59:53 -0700
committerJeff Garzik <jeff@garzik.org>2007-10-15 16:13:36 -0400
commit84284d3c1d6372bc9ab496607661d230d9c45de4 (patch)
tree3226b21ccb77955380ebfb1201c5714c88f1dc38
parente9edda697ed7697f1288d0656570e49c47e204ae (diff)
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>
-rw-r--r--drivers/net/xen-netfront.c35
1 files changed, 17 insertions, 18 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index f464b82c7d5..7fd505cc4f7 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -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;
-
- spinlock_t tx_lock;
- spinlock_t rx_lock;
-
unsigned int evtchn;
+ struct xenbus_device *xbdev;
- /* 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;
+ spinlock_t tx_lock;
+ 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];