[PATCH net] macvlan: implement .parse_protocol hook function in macvlan_hard_header_ops

The .parse_protocol hook function in the macvlan_header_ops structure is
not implemented. As a result, when the AF_PACKET family is used to send
packets, skb->protocol will be set to 0.
Macvlan is a device of type ARPHRD_ETHER (ether_setup). Therefore, use
eth_header_parse_protocol function to obtain the protocol.

Fixes: 75c65772c3d1 ("net/packet: Ask driver for protocol if not provided by user")
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Zhengchao Shao <redacted>
---
 drivers/net/macvlan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 88dd8a2245b0..a3cc665757e8 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c

@@ -609,6 +609,7 @@ static const struct header_ops macvlan_hard_header_ops = {
 	.parse		= eth_header_parse,
 	.cache		= eth_header_cache,
 	.cache_update	= eth_header_cache_update,
+	.parse_protocol	= eth_header_parse_protocol,
 };
 
 static int macvlan_open(struct net_device *dev)

-- 
2.34.1