[PATCH] net/iavf: fix VLAN offload with AVX512

[Michal Schmidt]

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.

This fix is for the AVX512 Rx path. The same bug in AVX2 was fixed
by commit eb24917428a1 ("net/iavf: fix VLAN offload with AVX2").

Fixes: 4b64ccb328c9 ("net/iavf: fix VLAN extraction in AVX512 path")
Cc: stable at dpdk.org

Signed-off-by: Michal Schmidt <mschmidt at redhat.com>
---
 drivers/net/iavf/iavf_rxtx_vec_avx512.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx512.c b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
index 4fe9b972786a..bd2788121b5a 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_avx512.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
@@ -1214,7 +1214,10 @@ _iavf_recv_raw_pkts_vec_avx512_flex_rxd(struct iavf_rx_queue *rxq,
 							(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,
-- 
2.39.2