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| author |   Vladimir Oltean <olteanv@gmail.com> | 2019-05-02 23:23:33 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-05-03 10:49:17 -0400 |
| commit | bf5bc3ce8a8f32a0d45b6820ede8f9fc3e9c23df (patch) | |
| tree | ca0084c139f92f6dc6bdf943e5ae5be6b32a9318 | |
| parent | net: dsa: sja1105: Error out if RGMII delays are requested in DT (diff) | |
| download | linux-dev-bf5bc3ce8a8f32a0d45b6820ede8f9fc3e9c23df.tar.xz linux-dev-bf5bc3ce8a8f32a0d45b6820ede8f9fc3e9c23df.zip | |
ether: Add dedicated Ethertype for pseudo-802.1Q DSA tagging
There are two possible utilizations so far:
- Switch devices that don't support a native insertion/extraction header
on the CPU port may still enjoy the benefits of port isolation with a
custom VLAN tag.
For this, they need to have a customizable TPID in hardware and a new
Ethertype to distinguish between real 802.1Q traffic and the private
tags used for port separation.
- Switches that don't support the deactivation of VLAN awareness, but
still want to have a mode in which they accept all traffic, including
frames that are tagged with a VLAN not configured on their ports, may
use this as a fake to trick the hardware into thinking that the TPID
for VLAN is something other than 0x8100.
What follows after the ETH_P_DSA_8021Q EtherType is a regular VLAN
header (TCI), however there is no other EtherType that can be used for
this purpose and doesn't already have a well-defined meaning.
ETH_P_8021AD, ETH_P_QINQ1, ETH_P_QINQ2 and ETH_P_QINQ3 expect that
another follow-up VLAN tag is present, which is not the case here.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/uapi/linux/if_ether.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/if_ether.h b/include/uapi/linux/if_ether.h index 3a45b4ad71a3..3158ba672b72 100644 --- a/include/uapi/linux/if_ether.h +++ b/include/uapi/linux/if_ether.h @@ -109,6 +109,7 @@ #define ETH_P_QINQ2 0x9200 /* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_QINQ3 0x9300 /* deprecated QinQ VLAN [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_EDSA 0xDADA /* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */ +#define ETH_P_DSA_8021Q 0xDADB /* Fake VLAN Header for DSA [ NOT AN OFFICIALLY REGISTERED ID ] */ #define ETH_P_IFE 0xED3E /* ForCES inter-FE LFB type */ #define ETH_P_AF_IUCV 0xFBFB /* IBM af_iucv [ NOT AN OFFICIALLY REGISTERED ID ] */ |