[PATCH] mbuf: expose outer vlan in mbuf dump

[Morten Brørup]

> From: Ben Magistro [mailto:koncept1 at gmail.com]
> Sent: Monday, 4 April 2022 02.57
> 
> Enable printing of the outer vlan if flags indicate it is present.
> 
> Signed-off-by: Ben Magistro <koncept1 at gmail.com>
> 
> ---
> 
> While troubleshooting some QinQ offloads with various Intel i40e
> firmware[1], it was
> helpful to expose the outer vlan in the dump mbuf calls.  This should
> be straightforward
> to backport and happy to do the work if accepted. I understand that
> this may not be a
> widely supported capability at this time, so we are okay if this is not
> accepted and
> we just maintain a local patch.

Features are usually not backported, only bug fixes.

However, since this patch proved helpful finding a bug, and it is very simple, it could be considered by the LTS maintainers.

> 
> ---
>  lib/mbuf/rte_mbuf.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/lib/mbuf/rte_mbuf.c b/lib/mbuf/rte_mbuf.c
> index 87592faccb..a2307cebe6 100644
> --- a/lib/mbuf/rte_mbuf.c
> +++ b/lib/mbuf/rte_mbuf.c
> @@ -674,6 +674,9 @@ rte_pktmbuf_dump(FILE *f, const struct rte_mbuf *m,
> unsigned dump_len)
>  	fprintf(f, "  pkt_len=%u, ol_flags=%#"PRIx64", nb_segs=%u,
> port=%u",
>  		m->pkt_len, m->ol_flags, m->nb_segs, m->port);
> 
> +	if (m->ol_flags & (RTE_MBUF_F_RX_QINQ | RTE_MBUF_F_TX_QINQ))
> +		fprintf(f, ", vlan_tci_outer=%u", m->vlan_tci_outer);
> +
>  	if (m->ol_flags & (RTE_MBUF_F_RX_VLAN | RTE_MBUF_F_TX_VLAN))
>  		fprintf(f, ", vlan_tci=%u", m->vlan_tci);
> 
> --
> 2.27.0
> 

Reviewed-by: Morten Brørup <mb at smartsharesystems.com>