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From: Larysa Zaremba <larysa.zaremba@intel.com>
To: bpf@vger.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@intel.com>,
	ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
	haoluo@google.com, jolsa@kernel.org,
	David Ahern <dsahern@gmail.com>, Jakub Kicinski <kuba@kernel.org>,
	Willem de Bruijn <willemb@google.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Anatoly Burakov <anatoly.burakov@intel.com>,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	Magnus Karlsson <magnus.karlsson@gmail.com>,
	Maryam Tahhan <mtahhan@redhat.com>,
	xdp-hints@xdp-project.net, netdev@vger.kernel.org,
	Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Simon Horman <simon.horman@corigine.com>,
	Tariq Toukan <tariqt@mellanox.com>,
	Saeed Mahameed <saeedm@mellanox.com>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
	Jesper Dangaard Brouer <jbrouer@redhat.com>
Subject: [xdp-hints] [RFC bpf-next v2 19/24] net: make vlan_get_tag() return -ENODATA instead of -EINVAL
Date: Wed, 27 Sep 2023 09:51:19 +0200	[thread overview]
Message-ID: <20230927075124.23941-20-larysa.zaremba@intel.com> (raw)
In-Reply-To: <20230927075124.23941-1-larysa.zaremba@intel.com>

__vlan_hwaccel_get_tag() is used in veth XDP hints implementation,
its return value (-EINVAL if skb is not VLAN tagged) is passed to bpf code,
but XDP hints specification requires drivers to return -ENODATA, if a hint
cannot be provided for a particular packet.

Solve this inconsistency by changing error return value of
__vlan_hwaccel_get_tag() from -EINVAL to -ENODATA, do the same thing to
__vlan_get_tag(), because this function is supposed to follow the same
convention. This, in turn, makes -ENODATA the only non-zero value
vlan_get_tag() can return. We can do this with no side effects, because
none of the users of the 3 above-mentioned functions rely on the exact
value.

Suggested-by: Jesper Dangaard Brouer <jbrouer@redhat.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 include/linux/if_vlan.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 3028af87716e..c1645c86eed9 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -540,7 +540,7 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
 	struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
 
 	if (!eth_type_vlan(veth->h_vlan_proto))
-		return -EINVAL;
+		return -ENODATA;
 
 	*vlan_tci = ntohs(veth->h_vlan_TCI);
 	return 0;
@@ -561,7 +561,7 @@ static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
 		return 0;
 	} else {
 		*vlan_tci = 0;
-		return -EINVAL;
+		return -ENODATA;
 	}
 }
 
-- 
2.41.0


  parent reply	other threads:[~2023-09-27  7:58 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-27  7:51 [xdp-hints] [RFC bpf-next v2 00/24] XDP metadata via kfuncs for ice + mlx5 Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 01/24] ice: make RX hash reading code more reusable Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 02/24] ice: make RX HW timestamp " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 03/24] ice: make RX checksum checking " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 04/24] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 05/24] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 06/24] ice: Support HW timestamp hint Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 07/24] ice: Support RX hash XDP hint Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 08/24] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 09/24] xdp: Add VLAN tag hint Larysa Zaremba
2023-10-03 12:35   ` [xdp-hints] " Jakub Kicinski
2023-10-03 13:09     ` Alexander Lobakin
2023-10-04 18:08       ` Jakub Kicinski
2023-10-05 16:58         ` Alexander Lobakin
2023-10-05 17:16           ` Jakub Kicinski
2023-10-05 17:20             ` David Ahern
2023-10-05 18:06               ` Jakub Kicinski
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 10/24] ice: Implement " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 11/24] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 12/24] xdp: Add checksum hint Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 13/24] ice: Implement " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 14/24] ice: put XDP meta sources assignment under a static key condition Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 15/24] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 16/24] net, xdp: allow metadata > 32 Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 17/24] selftests/bpf: Add flags and new hints to xdp_hw_metadata Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 18/24] veth: Implement VLAN tag and checksum XDP hint Larysa Zaremba
2023-09-27  7:51 ` Larysa Zaremba [this message]
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 20/24] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 21/24] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 22/24] selftests/bpf: check checksum state " Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 23/24] mlx5: implement VLAN tag XDP hint Larysa Zaremba
2023-09-27  7:51 ` [xdp-hints] [RFC bpf-next v2 24/24] mlx5: implement RX checksum " Larysa Zaremba

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