netdev - [PATCH net-next 2/4] net/hyperv: use skb_vlan_tag

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Date:   Tue, 20 Nov 2018 13:20:32 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     netdev@...r.kernel.org
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        devel@...uxdriverproject.org,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
        Saeed Mahameed <saeedm@...lanox.com>,
        Sathya Perla <sathya.perla@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>
Subject: [PATCH net-next 2/4] net/hyperv: use skb_vlan_tag_*() helpers

Replace open-coded bitfield manipulation with skb_vlan_tag_*() helpers.
This also enables correctly passing of VLAN.CFI bit.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/net/hyperv/netvsc_drv.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index cf36e7ff3191..85936ed9e952 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -605,9 +605,9 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 				     IEEE_8021Q_INFO);
 
 		vlan->value = 0;
-		vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
-		vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
-				VLAN_PRIO_SHIFT;
+		vlan->vlanid = skb_vlan_tag_get_id(skb);
+		vlan->cfi = skb_vlan_tag_get_cfi(skb);
+		vlan->pri = skb_vlan_tag_get_prio(skb);
 	}
 
 	if (skb_is_gso(skb)) {
@@ -781,7 +781,8 @@ static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
 	}
 
 	if (vlan) {
-		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT);
+		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |
+			(vlan->cfi ? VLAN_CFI_MASK : 0);
 
 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
 				       vlan_tci);
-- 
2.19.1