[dpdk-dev] [PATCH 1/3] net/netvsc: support receive without vlan strip

[Stephen Hemminger]

In some cases, VLAN stripping is not desireable. If necessary
re-insert stripped vlan tag.

Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
---
 drivers/net/netvsc/hn_ethdev.c | 2 ++
 drivers/net/netvsc/hn_rxtx.c   | 8 ++++++++
 drivers/net/netvsc/hn_var.h    | 5 +++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index b330bf3d7255..d7ac0c7320b0 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -378,6 +378,8 @@ static int hn_dev_configure(struct rte_eth_dev *dev)
                return -EINVAL;
        }
 
+       hv->vlan_strip = !!(rxmode->offloads & DEV_RX_OFFLOAD_VLAN_STRIP);
+
        err = hn_rndis_conf_offload(hv, txmode->offloads,
                                    rxmode->offloads);
        if (err) {
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index f4a36641b6c3..622a83983e10 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -501,6 +501,14 @@ static void hn_rxpkt(struct hn_rx_queue *rxq, struct 
hn_rx_bufinfo *rxb,
        if (info->vlan_info != HN_NDIS_VLAN_INFO_INVALID) {
                m->vlan_tci = info->vlan_info;
                m->ol_flags |= PKT_RX_VLAN_STRIPPED | PKT_RX_VLAN;
+
+               /* NDIS always strips tag, put it back if necessary */
+               if (!hv->vlan_strip && rte_vlan_insert(&m)) {
+                       PMD_DRV_LOG(DEBUG, "vlan insert failed");
+                       ++rxq->stats.errors;
+                       rte_pktmbuf_free(m);
+                       return;
+               }
        }
 
        if (info->csum_info != HN_NDIS_RXCSUM_INFO_INVALID) {
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index e1072c7cfa55..cd173f6af942 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -97,8 +97,9 @@ struct hn_data {
        struct rte_eth_dev *vf_dev;             /* Subordinate device */
        rte_spinlock_t  vf_lock;
        uint16_t        port_id;
-       bool            closed;
-       bool            vf_present;
+       uint8_t         closed;
+       uint8_t         vf_present;
+       uint8_t         vlan_strip;
        uint32_t        link_status;
        uint32_t        link_speed;
 
-- 
2.19.2