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| author | Linus Walleij <linusw@kernel.org> | 2026-09-16 12:20:59 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2026-09-18 17:49:09 -0700 |
| commit | ca30cd47fe7fd1a7eabf6ec120b8d142cfd7eeef (patch) | |
| tree | a2211aadfb327e61c36ad11edac74e90d0c75b26 /include | |
| parent | 7a5e75f649165296b72c151ad0629246806378be (diff) | |
| download | linux-next-ca30cd47fe7fd1a7eabf6ec120b8d142cfd7eeef.tar.gz linux-next-ca30cd47fe7fd1a7eabf6ec120b8d142cfd7eeef.zip | |
net: dsa: tag_ks8995: Add the KS8995 tag handling
The KS8995 100Mbit switch can do proper DSA per-port tagging
with the proper set-up. This adds the code to handle ingress
and egress KS8995 tags.
The tagger is used by the KSZ8995XA support added later in this
series.
The tag is a modified 0x8100 ethertype tag where a bit in the
last nibble is set for each target port.
Always insert a distinct outer switch tag. User ports remove this
field on egress, so reusing an existing 802.1Q header would consume
the sender VLAN tag instead of preserving it.
Push any hardware-accelerated VLAN tag into the packet first. This
keeps the switch tag at offset 12 while retaining 802.1Q, 802.1ad and
stacked VLAN headers as inner payload, and avoids relying on a valid
SKB MAC header in direct transmit paths.
Rate-limit receive untagging errors so repeated failures cannot flood
the kernel log.
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260916-ks8995-to-ksz8-v15-2-8825ff5fd4be@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/dsa.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/dsa.h b/include/net/dsa.h index 7507d632e7c6..5d12191b6f6f 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -61,6 +61,7 @@ struct tc_action; #define DSA_TAG_PROTO_NETC_VALUE 33 #define DSA_TAG_PROTO_KSZ8463_VALUE 34 #define DSA_TAG_PROTO_MT7628_VALUE 35 +#define DSA_TAG_PROTO_KS8995_VALUE 36 enum dsa_tag_protocol { DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE, @@ -99,6 +100,7 @@ enum dsa_tag_protocol { DSA_TAG_PROTO_NETC = DSA_TAG_PROTO_NETC_VALUE, DSA_TAG_PROTO_KSZ8463 = DSA_TAG_PROTO_KSZ8463_VALUE, DSA_TAG_PROTO_MT7628 = DSA_TAG_PROTO_MT7628_VALUE, + DSA_TAG_PROTO_KS8995 = DSA_TAG_PROTO_KS8995_VALUE, }; struct dsa_switch; |