From 43bf99ce009de710b68473480a611f3b5ddd11d5 Mon Sep 17 00:00:00 2001
From: stephen hemminger <stephen@networkplumber.org>
Date: Mon, 24 Jul 2017 10:57:27 -0700
Subject: [PATCH] netvsc: prefetch the first incoming ring element

In interrupt handler, prefetch the first incoming ring element
so that it is in cache by the time NAPI poll gets to it.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/hyperv/netvsc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 0a9d9feedc3f..06f39a99da7c 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -30,6 +30,7 @@
 #include <linux/if_ether.h>
 #include <linux/vmalloc.h>
 #include <linux/rtnetlink.h>
+#include <linux/prefetch.h>
 
 #include <asm/sync_bitops.h>
 
@@ -1265,10 +1266,15 @@ int netvsc_poll(struct napi_struct *napi, int budget)
 void netvsc_channel_cb(void *context)
 {
 	struct netvsc_channel *nvchan = context;
+	struct vmbus_channel *channel = nvchan->channel;
+	struct hv_ring_buffer_info *rbi = &channel->inbound;
+
+	/* preload first vmpacket descriptor */
+	prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
 
 	if (napi_schedule_prep(&nvchan->napi)) {
 		/* disable interupts from host */
-		hv_begin_read(&nvchan->channel->inbound);
+		hv_begin_read(rbi);
 
 		__napi_schedule(&nvchan->napi);
 	}