From 8dce89aa5f3274e7c26132433840f63d129406bb Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 14 Nov 2019 17:03:29 +0200 Subject: net: dsa: ocelot: add tagger for Ocelot/Felix switches While it is entirely possible that this tagger format is in fact more generic than just these 2 switch families, I don't have that knowledge. The Seville switch in NXP T1040 has a similar frame format, but there are enough differences (e.g. DEST field starts at bit 57 instead of 56) that calling this file tag_vitesse.c is a bit of a stretch at the moment. The frame format has been listed in a comment so that people who add support for further Vitesse switches can rework this tagger while keeping compatibility with Felix. The "ocelot" name was chosen instead of "felix" because even the Ocelot switch can act as a DSA device when it is used in NPI mode, and the Felix tagger format is almost identical. Currently it is only used for the Felix switch embedded in the NXP LS1028A chip. The ABI for this tagger should be considered "not stable" at the moment. The DSA tag is always placed before the Ethernet header and therefore, we are using the long prefix for RX tags to avoid putting the DSA master port in promiscuous mode. Once there will be an API in DSA for drivers to request DSA masters to be in promiscuous mode unconditionally, we will switch to the "no prefix" extraction frame header, which will save 16 padding bytes for each RX frame. Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller --- include/net/dsa.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/net/dsa.h') diff --git a/include/net/dsa.h b/include/net/dsa.h index 9507611a41f0..6767dc3f66c0 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -42,6 +42,7 @@ struct phylink_link_state; #define DSA_TAG_PROTO_8021Q_VALUE 12 #define DSA_TAG_PROTO_SJA1105_VALUE 13 #define DSA_TAG_PROTO_KSZ8795_VALUE 14 +#define DSA_TAG_PROTO_OCELOT_VALUE 15 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -59,6 +60,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE, DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE, DSA_TAG_PROTO_KSZ8795 = DSA_TAG_PROTO_KSZ8795_VALUE, + DSA_TAG_PROTO_OCELOT = DSA_TAG_PROTO_OCELOT_VALUE, }; struct packet_type; -- cgit v1.2.3-70-g09d2