hyperv: Add latest NetVSP versions to auto negotiation

It auto negotiates the highest NetVSP version supported by both guest and host.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 9 deletions

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 9a0e9c6f1414..1a0280dcba7e 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -290,7 +290,7 @@ static int negotiate_nvsp_ver(struct hv_device *device,
             NVSP_STAT_SUCCESS)
                 return -EINVAL;
 
-        if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
+        if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
                 return 0;
 
         /* NVSPv2 only: Send NDIS config */
@@ -314,6 +314,9 @@ static int netvsc_connect_vsp(struct hv_device *device)
         struct nvsp_message *init_packet;
         int ndis_version;
         struct net_device *ndev;
+        u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
+                NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
+        int i, num_ver = 4; /* number of different NVSP versions */
 
         net_device = get_outbound_net_device(device);
         if (!net_device)
@@ -323,13 +326,14 @@ static int netvsc_connect_vsp(struct hv_device *device)
         init_packet = &net_device->channel_init_pkt;
 
         /* Negotiate the latest NVSP protocol supported */
-        if (negotiate_nvsp_ver(device, net_device, init_packet,
-                               NVSP_PROTOCOL_VERSION_2) == 0) {
-                net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
-        } else if (negotiate_nvsp_ver(device, net_device, init_packet,
-                                    NVSP_PROTOCOL_VERSION_1) == 0) {
-                net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
-        } else {
+        for (i = num_ver - 1; i >= 0; i--)
+                if (negotiate_nvsp_ver(device, net_device, init_packet,
+                                       ver_list[i])  == 0) {
+                        net_device->nvsp_version = ver_list[i];
+                        break;
+                }
+
+        if (i < 0) {
                 ret = -EPROTO;
                 goto cleanup;
         }
@@ -339,7 +343,10 @@ static int netvsc_connect_vsp(struct hv_device *device)
         /* Send the ndis version */
         memset(init_packet, 0, sizeof(struct nvsp_message));
 
-        ndis_version = 0x00050001;
+        if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
+                ndis_version = 0x00050001;
+        else
+                ndis_version = 0x0006001e;
 
         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
         init_packet->msg.v1_msg.