> -----Original Message-----
> From: Michal Schmidt <[email protected]>
> Sent: Monday, March 27, 2023 6:08 PM
> To: [email protected]
> Cc: Richardson, Bruce <[email protected]>; Konstantin Ananyev
> <[email protected]>; Wu, Jingjing <[email protected]>;
> Xing, Beilei <[email protected]>; Rong, Leyi <[email protected]>; Lu,
> Wenzhuo <[email protected]>; [email protected]
> Subject: [PATCH] net/iavf: fix VLAN offload with AVX512
>
> 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: [email protected]
>
> Signed-off-by: Michal Schmidt <[email protected]>
Acked-by: Wenzhuo Lu <[email protected]>
