hv_netvsc: propogate Hyper-V friendly name into interface alias (0fe554a4) · Commits · 戴 / test

This patch implement the 'Device Naming' feature of the Hyper-V network device API. In Hyper-V on the host through the GUI or PowerShell it is possible to enable the device naming feature which causes the host to make available to the guest the name of the device. This shows up in the RNDIS protocol as the friendly name. The name has no particular meaning and is limited to 256 characters. The value can only be set via PowerShell on the host, but could be scripted for mass deployments. The default value is the string 'Network Adapter' and since that is the same for all devices and useless, the driver ignores it. In Windows, the value goes into a registry key for use in SNMP ifAlias. For Linux, this patch puts the value in the network device alias property; where it is visible in ip tools and SNMP. The host provided ifAlias is just a suggestion, and can be overridden by later ip commands. Also requires exporting dev_set_alias in netdev core. Signed-off-by:

Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/hyperv/rndis_filter.c

+28 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@
		#include <linux/nls.h>
		#include <linux/vmalloc.h>
		#include <linux/rtnetlink.h>
		#include <linux/ucs2_string.h>

		#include "hyperv_net.h"
		#include "netvsc_trace.h"
		@@ -1223,6 +1224,29 @@ static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
		return ret;
		}

		static void rndis_get_friendly_name(struct net_device *net,
		struct rndis_device *rndis_device,
		struct netvsc_device *net_device)
		{
		ucs2_char_t wname[256];
		unsigned long len;
		u8 ifalias[256];
		u32 size;

		size = sizeof(wname);
		if (rndis_filter_query_device(rndis_device, net_device,
		RNDIS_OID_GEN_FRIENDLY_NAME,
		wname, &size) != 0)
		return;

		/* Convert Windows Unicode string to UTF-8 */
		len = ucs2_as_utf8(ifalias, wname, sizeof(ifalias));

		/* ignore the default value from host */
		if (strcmp(ifalias, "Network Adapter") != 0)
		dev_set_alias(net, ifalias, len);
		}

		struct netvsc_device rndis_filter_device_add(struct hv_device dev,
		struct netvsc_device_info *device_info)
		{
		@@ -1276,6 +1300,10 @@ struct netvsc_device rndis_filter_device_add(struct hv_device dev,

		memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);

		/* Get friendly name as ifalias*/
		if (!net->ifalias)
		rndis_get_friendly_name(net, rndis_device, net_device);

		/* Query and set hardware capabilities */
		ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
		if (ret != 0)

net/core/dev.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1285,6 +1285,7 @@ int dev_set_alias(struct net_device dev, const char alias, size_t len)

		return len;
		}
		EXPORT_SYMBOL(dev_set_alias);

		/**
		* dev_get_alias - get ifalias of a device

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