[dpdk-dev] [PATCH v2] fm10k: fix wrong VLAN value in RX mbuf

[Shaopeng He <shaopeng.he@intel.com>]

vlan_tci should be copied from RX descriptor to mbuf,
and flag PKT_RX_VLAN_PKT should be set for every RX packet,
this patch fixes this issue.
fm10k's Ethernet switch core associates a VLAN ID and VLAN PRI
for each packet. For those packets coming in without a VLAN,
the port default VLAN ID will be used.
So in fm10k, always PKT_RX_VLAN_PKT flag is set and vlan_tci
is valid for each RX packet's mbuf.

Signed-off-by: Shaopeng He <shaopeng.he@intel.com>
---
ChangeLog:

v2:
* change flag PKT_RX_VLAN_PKT to always set
* preserve the priority bits in vlan_tci

 drivers/net/fm10k/fm10k_rxtx.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/fm10k/fm10k_rxtx.c b/drivers/net/fm10k/fm10k_rxtx.c
index 1bac28d..764f4f4 100644
--- a/drivers/net/fm10k/fm10k_rxtx.c
+++ b/drivers/net/fm10k/fm10k_rxtx.c
@@ -104,8 +104,14 @@ rx_desc_to_ol_flags(struct rte_mbuf *m, const union fm10k_rx_desc *d)
 		(FM10K_RXD_STATUS_L4CS | FM10K_RXD_STATUS_L4E)))
 		m->ol_flags |= PKT_RX_L4_CKSUM_BAD;
 
-	if (d->d.staterr & FM10K_RXD_STATUS_VEXT)
-		m->ol_flags |= PKT_RX_VLAN_PKT;
+	/**
+	 * fm10k's Ethernet switch core associates a VLAN ID and VLAN PRI
+	 * for each packet. For those packets coming in without a VLAN,
+	 * the port default VLAN ID will be used.
+	 * So in fm10k, always PKT_RX_VLAN_PKT flag is set and vlan_tci
+	 * is valid for each RX packet's mbuf.
+	 */
+	m->ol_flags |= PKT_RX_VLAN_PKT;
 
 	if (unlikely(d->d.staterr & FM10K_RXD_STATUS_HBO))
 		m->ol_flags |= PKT_RX_HBUF_OVERFLOW;
@@ -146,6 +152,8 @@ fm10k_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 #endif
 
 		mbuf->hash.rss = desc.d.rss;
+		/* in fm10k, vlan_tci is always valid for RX packet */
+		mbuf->vlan_tci = desc.w.vlan;
 
 		rx_pkts[count] = mbuf;
 		if (++next_dd == q->nb_desc) {
@@ -292,6 +300,8 @@ fm10k_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 		rx_desc_to_ol_flags(first_seg, &desc);
 #endif
 		first_seg->hash.rss = desc.d.rss;
+		/* in fm10k, vlan_tci is always valid for RX packet */
+		first_seg->vlan_tci = desc.w.vlan;
 
 		/* Prefetch data of first segment, if configured to do so. */
 		rte_packet_prefetch((char *)first_seg->buf_addr +
-- 
1.9.3