linux-kernel - [PATCH] xen-netfront: rearrange netfront_info structure to separate tx and rx

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Message-ID: <470BCC1D.4080007@goop.org>
Date:	Tue, 09 Oct 2007 11:44:45 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeff Garzik <jeff@...zik.org>
CC:	NetDev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Keir Fraser <Keir.Fraser@...cam.ac.uk>,
	Stephen Hemminger <shemminge@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCH] xen-netfront: rearrange netfront_info structure to separate
 tx and rx

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

Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Cc: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: Christoph Hellwig <hch@...radead.org>

---
 drivers/net/xen-netfront.c |   37 ++++++++++++++++++-------------------
 1 file changed, 18 insertions(+), 19 deletions(-)

===================================================================
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -72,22 +72,12 @@ struct netfront_info {
 	struct list_head list;
 	struct net_device *netdev;
 
+	unsigned int evtchn;
+	struct xenbus_device *xbdev;
+
+	spinlock_t   tx_lock;
 	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;
-
-	/* 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;
+	int tx_ring_ref;
 
 	/*
 	 * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
@@ -106,13 +96,22 @@ 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];

-
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