[PATCH] net/iavf: fix mbuf VLAN offload flags in the L2TAG2 path with AVX2

[Michal Schmidt <mschmidt@redhat.com>]

It has been observed that mbufs of some received VLAN packets had the
VLAN tag correctly set in vlan_tci, but ol_flags were missing the
VLAN-indicating flags.

_mm256_shuffle_epi8 operates as two independent 128-bit operations,
not as a single 256-bit operation. To have the RTE_MBUF_F_RX_VLAN* flags
reflected in the resulting vlan_flags for all 8 rx descriptors, the
input l2tag2_flags_shuf must contain the required pattern in both
128-bit halves.

Fixes: 3a1aca384d3a ("net/iavf: fix VLAN tag extraction handling")

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
---
 drivers/net/iavf/iavf_rxtx_vec_avx2.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx2.c b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
index 862f6eb0c0..b4ebac9d34 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_avx2.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_avx2.c
@@ -1074,7 +1074,10 @@ _iavf_recv_raw_pkts_vec_avx2_flex_rxd(struct iavf_rx_queue *rxq,
 					_mm256_set_epi8(0, 0, 0, 0,
 							0, 0, 0, 0,
 							0, 0, 0, 0,
-							0, 0, 0, 0,
+							0, 0,
+							RTE_MBUF_F_RX_VLAN |
+							RTE_MBUF_F_RX_VLAN_STRIPPED,
+							0,
 							/* end up 128-bits */
 							0, 0, 0, 0,
 							0, 0, 0, 0,
-- 
2.37.2