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: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 7d06b49..13010b4 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -513,6 +513,7 @@
#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
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 1a0280d..daddea2 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -365,6 +365,11 @@
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 @@
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);