add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/macvtap.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/etherdevice.h>
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 #include <linux/if_macvlan.h>
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 #include <linux/if_tap.h>
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@@ -132,11 +133,17 @@
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 	dev->tx_queue_len = TUN_READQ_SIZE;
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 }
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+static struct net *macvtap_link_net(const struct net_device *dev)
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+{
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+	return dev_net(macvlan_dev_real_dev(dev));
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+}
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+
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 static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
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 	.kind		= "macvtap",
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 	.setup		= macvtap_setup,
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 	.newlink	= macvtap_newlink,
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 	.dellink	= macvtap_dellink,
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+	.get_link_net	= macvtap_link_net,
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 	.priv_size      = sizeof(struct macvtap_dev),
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 };
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