linux-kernel - Re: [PATCH RESEND bpf-next 10/15] ice: Implement VLAN tag hint

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Message-ID: <e4a9fa43-06f7-5271-effc-20cac59b0e64@redhat.com>
Date:   Mon, 15 May 2023 17:07:19 +0200
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Larysa Zaremba <larysa.zaremba@...el.com>,
        Stanislav Fomichev <sdf@...gle.com>
Cc:     brouer@...hat.com, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND bpf-next 10/15] ice: Implement VLAN tag hint



On 15/05/2023 15.41, Larysa Zaremba wrote:
>>> +	*vlan_tag = ice_get_vlan_tag_from_rx_desc(xdp_ext->eop_desc);
>> Should we also do the following:
>>
>> if (!*vlan_tag)
>> 	return -ENODATA;
>>
>> ?
> Oh, returning VLAN tag with zero value really made sense to me at the beginning,
> but after playing with different kinds of packets, I think returning error makes
> more sense. Will change.
> 

IIRC then VLAN tag zero is also a valid id, right?

--Jesper