[PATCH v4] net/netvsc: fix parsing of VLAN metadata

[Alan Elder <alan.elder@microsoft.com>]

The previous code incorrectly parsed the VLAN ID and priority.
If the 16-bits of VLAN ID and priority/CFI on the wire was
0123456789ABCDEF the code parsed it as 456789ABCDEF3012.  There
were macros defined to handle this conversion but they were not
used.

Fixes: 4e9c73e96e83 ("net/netvsc: add Hyper-V network device")
Cc: sthemmin@microsoft.com
Cc: stable@dpdk.org

Signed-off-by: Alan Elder <alan.elder@microsoft.com>
---
v4:
* Make consistent with FreeBSD code

 .mailmap                     |  1 +
 drivers/net/netvsc/hn_rxtx.c | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/.mailmap b/.mailmap
index a0756974e2..eca02318d6 100644
--- a/.mailmap
+++ b/.mailmap
@@ -33,6 +33,7 @@ Alain Leon <xerebz@gmail.com>
 Alan Brady <alan.brady@intel.com>
 Alan Carew <alan.carew@intel.com>
 Alan Dewar <alan.dewar@att.com> <adewar@brocade.com>
+Alan Elder <alan.elder@microsoft.com>
 Alan Liu <zaoxingliu@gmail.com>
 Alan Winkowski <walan@marvell.com>
 Alejandro Lucero <alejandro.lucero@netronome.com>
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index e4f5015aa3..1cbb8df03f 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -42,6 +42,19 @@
 #define HN_TXD_CACHE_SIZE	32 /* per cpu tx_descriptor pool cache */
 #define HN_RXQ_EVENT_DEFAULT	2048
 
+#define HN_VLAN_CFI_SHIFT	12
+#define HN_VLAN_PRI_SHIFT	13
+#define HN_VLAN_PRI_MASK	0xe000 /* Priority Code Point */
+#define HN_VLAN_CFI_MASK	0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
+#define HN_VLAN_VID_MASK	0x0fff /* VLAN Identifier */
+
+#define HN_VLAN_TCI_ID(vlan_tci)	((vlan_tci) & HN_VLAN_VID_MASK)
+#define HN_VLAN_TCI_PRI(vlan_tci)	(((vlan_tci) & HN_VLAN_PRI_MASK) >> HN_VLAN_PRI_SHIFT)
+#define HN_VLAN_TCI_CFI(vlan_tci)	(((vlan_tci) & HN_VLAN_CFI_MASK) >> HN_VLAN_CFI_SHIFT)
+#define HN_VLAN_TCI_MAKE(id, pri, cfi)	((id) |				\
+					 ((pri) << HN_VLAN_PRI_SHIFT) |	\
+					 ((cfi) << HN_VLAN_CFI_SHIFT))
+
 struct hn_rxinfo {
 	uint32_t	vlan_info;
 	uint32_t	csum_info;
@@ -612,7 +625,9 @@ static void hn_rxpkt(struct hn_rx_queue *rxq, struct hn_rx_bufinfo *rxb,
 					   RTE_PTYPE_L4_MASK);
 
 	if (info->vlan_info != HN_NDIS_VLAN_INFO_INVALID) {
-		m->vlan_tci = info->vlan_info;
+		m->vlan_tci = HN_VLAN_TCI_MAKE(NDIS_VLAN_INFO_ID(info->vlan_info),
+					       NDIS_VLAN_INFO_PRI(info->vlan_info),
+					       NDIS_VLAN_INFO_CFI(info->vlan_info));
 		m->ol_flags |= RTE_MBUF_F_RX_VLAN_STRIPPED | RTE_MBUF_F_RX_VLAN;
 
 		/* NDIS always strips tag, put it back if necessary */
@@ -1332,7 +1347,9 @@ static void hn_encap(struct rndis_packet_msg *pkt,
 	if (m->ol_flags & RTE_MBUF_F_TX_VLAN) {
 		pi_data = hn_rndis_pktinfo_append(pkt, NDIS_VLAN_INFO_SIZE,
 						  NDIS_PKTINFO_TYPE_VLAN);
-		*pi_data = m->vlan_tci;
+		*pi_data = NDIS_VLAN_INFO_MAKE(HN_VLAN_TCI_ID(m->vlan_tci),
+					       HN_VLAN_TCI_PRI(m->vlan_tci),
+					       HN_VLAN_TCI_CFI(m->vlan_tci));
 	}
 
 	if (m->ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
-- 
2.25.1