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Commit 99d3016d authored by Haiyang Zhang's avatar Haiyang Zhang Committed by David S. Miller
Browse files

hyperv: Change the receive buffer size for legacy hosts 



Due to a bug in the Hyper-V host verion 2008R2, we need to use a slightly smaller
receive buffer size, otherwise the buffer will not be accepted by the legacy hosts.

Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3772ab1d

drivers/net/hyperv/hyperv_net.h

+1 −0
Original line number Diff line number Diff line
@@ -513,6 +513,7 @@ struct nvsp_message { 
#define NETVSC_MTU 65536



#define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024*16)	/* 16MB */

#define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY	(1024*1024*15)  /* 15MB */



#define NETVSC_RECEIVE_BUFFER_ID		0xcafe

drivers/net/hyperv/netvsc.c

+5 −1
Original line number Diff line number Diff line
@@ -365,6 +365,11 @@ static int netvsc_connect_vsp(struct hv_device *device) 
		goto cleanup;



	/* Post the big receive buffer to NetVSP */

	if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)

		net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;

	else

		net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;



	ret = netvsc_init_recv_buf(device);



cleanup:
@@ -898,7 +903,6 @@ int netvsc_device_add(struct hv_device *device, void *additional_info) 
	ndev = net_device->ndev;



	/* Initialize the NetVSC channel extension */

	net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;

	spin_lock_init(&net_device->recv_pkt_list_lock);



	INIT_LIST_HEAD(&net_device->recv_pkt_list);