linux-kernel - [PATCH v2 net-next] net: tap: check vlan with eth_type

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Date:   Thu, 14 Jan 2021 18:32:38 -0800
From:   menglong8.dong@...il.com
To:     kuba@...nel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Menglong Dong <dong.menglong@....com.cn>
Subject: [PATCH v2 net-next] net: tap: check vlan with eth_type_vlan() method

From: Menglong Dong <dong.menglong@....com.cn>

Replace some checks for ETH_P_8021Q and ETH_P_8021AD in
drivers/net/tap.c with eth_type_vlan.

Signed-off-by: Menglong Dong <dong.menglong@....com.cn>
---
v2:
- use eth_type_vlan() in tap_get_user_xdp() too.
---
 drivers/net/tap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 3c652c8ac5ba..ff4aa35979a1 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -713,8 +713,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
 	skb_probe_transport_header(skb);
 
 	/* Move network header to the right position for VLAN tagged packets */
-	if ((skb->protocol == htons(ETH_P_8021Q) ||
-	     skb->protocol == htons(ETH_P_8021AD)) &&
+	if (eth_type_vlan(skb->protocol) &&
 	    __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
 		skb_set_network_header(skb, depth);
 
@@ -1164,8 +1163,7 @@ static int tap_get_user_xdp(struct tap_queue *q, struct xdp_buff *xdp)
 	}
 
 	/* Move network header to the right position for VLAN tagged packets */
-	if ((skb->protocol == htons(ETH_P_8021Q) ||
-	     skb->protocol == htons(ETH_P_8021AD)) &&
+	if (eth_type_vlan(skb->protocol) &&
 	    __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
 		skb_set_network_header(skb, depth);
 
-- 
2.25.1