linux-kernel - [PATCH net-next,v2] hyperv: Increase the buffer length for netvsc_channel

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Date:	Wed, 13 Aug 2014 18:03:44 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	haiyangz@...rosoft.com, kys@...rosoft.com, olaf@...fle.de,
	jasowang@...hat.com, linux-kernel@...r.kernel.org,
	driverdev-devel@...uxdriverproject.org
Subject: [PATCH net-next,v2] hyperv: Increase the buffer length for netvsc_channel_cb()

When the buffer is too small for a packet from VMBus, a bigger buffer will be
allocated in netvsc_channel_cb() and retry reading the packet from VMBus.
Increasing this buffer size will reduce the retry overhead.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
Reviewed-by: Dexuan Cui <decui@...rosoft.com>
---
 drivers/net/hyperv/hyperv_net.h |    2 +-
 drivers/net/hyperv/netvsc.c     |    6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index d5e07de..b14a0ef 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -591,7 +591,7 @@ struct nvsp_message {
 
 #define NETVSC_RECEIVE_BUFFER_ID		0xcafe
 
-#define NETVSC_PACKET_SIZE                      2048
+#define NETVSC_PACKET_SIZE                      4096
 
 #define VRSS_SEND_TAB_SIZE 16
 
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 66979cf..45899f2 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -38,7 +38,7 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
 	struct netvsc_device *net_device;
 	struct net_device *ndev = hv_get_drvdata(device);
 
-	net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
+	net_device = vzalloc(sizeof(*net_device));
 	if (!net_device)
 		return NULL;
 
@@ -551,7 +551,7 @@ int netvsc_device_remove(struct hv_device *device)
 	if (net_device->sub_cb_buf)
 		vfree(net_device->sub_cb_buf);
 
-	kfree(net_device);
+	vfree(net_device);
 	return 0;
 }
 
@@ -1093,7 +1093,7 @@ close:
 	vmbus_close(device->channel);
 
 cleanup:
-	kfree(net_device);
+	vfree(net_device);
 
 	return ret;
 }
-- 
1.7.1

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