Re: [PATCH net-next v4 04/10] bridge: cfm: Kernel space implementation of CFM. MEP create/delete.

[Nikolay Aleksandrov]

On Fri, 2020-10-09 at 14:35 +0000, Henrik Bjoernlund wrote:
> This is the first commit of the implementation of the CFM protocol
> according to 802.1Q section 12.14.
> 
> It contains MEP instance create, delete and configuration.
> 
> Connectivity Fault Management (CFM) comprises capabilities for
> detecting, verifying, and isolating connectivity failures in
> Virtual Bridged Networks. These capabilities can be used in
> networks operated by multiple independent organizations, each
> with restricted management access to each other<E2><80><99>s equipment.
> 
> CFM functions are partitioned as follows:
>     - Path discovery
>     - Fault detection
>     - Fault verification and isolation
>     - Fault notification
>     - Fault recovery
> 
> Interface consists of these functions:
> br_cfm_mep_create()
> br_cfm_mep_delete()
> br_cfm_mep_config_set()
> br_cfm_cc_config_set()
> br_cfm_cc_peer_mep_add()
> br_cfm_cc_peer_mep_remove()
> 
> A MEP instance is created by br_cfm_mep_create()
>     -It is the Maintenance association End Point
>      described in 802.1Q section 19.2.
>     -It is created on a specific level (1-7) and is assuring
>      that no CFM frames are passing through this MEP on lower levels.
>     -It initiates and validates CFM frames on its level.
>     -It can only exist on a port that is related to a bridge.
>     -Attributes given cannot be changed until the instance is
>      deleted.
> 
> A MEP instance can be deleted by br_cfm_mep_delete().
> 
> A created MEP instance has attributes that can be
> configured by br_cfm_mep_config_set().
> 
> A MEP Continuity Check feature can be configured by
> br_cfm_cc_config_set()
>     The Continuity Check Receiver state machine can be
>     enabled and disabled.
>     According to 802.1Q section 19.2.8
> 
> A MEP can have Peer MEPs added and removed by
> br_cfm_cc_peer_mep_add() and br_cfm_cc_peer_mep_remove()
>     The Continuity Check feature can maintain connectivity
>     status on each added Peer MEP.
> 
> Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund@xxxxxxxxxxxxx>
> Reviewed-by: Horatiu Vultur  <horatiu.vultur@xxxxxxxxxxxxx>
> ---
>  include/uapi/linux/cfm_bridge.h |  23 +++
>  net/bridge/Makefile             |   2 +
>  net/bridge/br_cfm.c             | 278 ++++++++++++++++++++++++++++++++
>  net/bridge/br_if.c              |   1 +
>  net/bridge/br_private.h         |  10 ++
>  net/bridge/br_private_cfm.h     |  61 +++++++
>  6 files changed, 375 insertions(+)
>  create mode 100644 include/uapi/linux/cfm_bridge.h
>  create mode 100644 net/bridge/br_cfm.c
>  create mode 100644 net/bridge/br_private_cfm.h
> 

Acked-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx>