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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Srinivas Kandagatla , Heiner Kallweit , Russell King , "Chester A. Unal" , Daniel Golle , DENG Qingfang , Sean Wang , Simon Horman , Matthias Brugger , AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [net-next PATCH v16 10/10] net: dsa: tag_mtk: add comments about Airoha usage of this TAG Message-ID: <20250910082017.hjlq3664xvg5qjub@skbuf> References: <20250909004343.18790-1-ansuelsmth@gmail.com> <20250909004343.18790-1-ansuelsmth@gmail.com> <20250909004343.18790-11-ansuelsmth@gmail.com> <20250909004343.18790-11-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250909004343.18790-11-ansuelsmth@gmail.com> <20250909004343.18790-11-ansuelsmth@gmail.com> On Tue, Sep 09, 2025 at 02:43:41AM +0200, Christian Marangi wrote: > Add comments about difference between Airoha AN8855 and Mediatek tag > bitmap. > > Airoha AN88555 doesn't support controlling SA learning and Leaky VLAN Is there an extra 5 in AN88555? > from tag. Although these bits are not used (and even not defined for > Leaky VLAN), it's worth to add comments for these difference to prevent > any kind of regression in the future if ever these bits will be used. > > Signed-off-by: Christian Marangi > --- > net/dsa/tag_mtk.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c > index b670e3c53e91..ac3f956abe39 100644 > --- a/net/dsa/tag_mtk.c > +++ b/net/dsa/tag_mtk.c > @@ -18,6 +18,9 @@ > #define MTK_HDR_XMIT_TAGGED_TPID_88A8 2 > #define MTK_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0) > #define MTK_HDR_XMIT_DP_BIT_MASK GENMASK(5, 0) > +/* AN8855 doesn't support SA_DIS and Leaky VLAN > + * control in tag as these bits doesn't exist. > + */ I think it would be good to present the AN8855 tag using a different string, so that libpcap knows it shouldn't decode these bits. The code can be reused for now. > #define MTK_HDR_XMIT_SA_DIS BIT(6) > > static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb, > -- > 2.51.0 >