Re: [net-next v2 07/11] bridge: cfm: Netlink Interface.

[Nikolay Aleksandrov <nikolay@nvidia.com>]

On Thu, 2020-10-01 at 10:30 +0000, Henrik Bjoernlund wrote:
> This is the implementation of CFM netlink configuration
> and status information interface.
> 
> Add new nested netlink attributes. These attributes are used by the
> user space to create/delete/configure CFM instances and get status.
> Also they are used by the kernel to notify the user space when changes
> in any status happens.
> 
> SETLINK:
>     IFLA_BRIDGE_CFM:
>         Indicate that the following attributes are CFM.
> 
>     IFLA_BRIDGE_CFM_MEP_CREATE:
>         This indicate that a MEP instance must be created.
>     IFLA_BRIDGE_CFM_MEP_DELETE:
>         This indicate that a MEP instance must be deleted.
>     IFLA_BRIDGE_CFM_MEP_CONFIG:
>         This indicate that a MEP instance must be configured.
>     IFLA_BRIDGE_CFM_CC_CONFIG:
>         This indicate that a MEP instance Continuity Check (CC)
>         functionality must be configured.
>     IFLA_BRIDGE_CFM_CC_PEER_MEP_ADD:
>         This indicate that a CC Peer MEP must be added.
>     IFLA_BRIDGE_CFM_CC_PEER_MEP_REMOVE:
>         This indicate that a CC Peer MEP must be removed.
>     IFLA_BRIDGE_CFM_CC_CCM_TX:
>         This indicate that the CC transmitted CCM PDU must be configured.
>     IFLA_BRIDGE_CFM_CC_RDI:
>         This indicate that the CC transmitted CCM PDU RDI must be
>         configured.
> 
> GETLINK:
>     Request filter RTEXT_FILTER_CFM_CONFIG:
>     Indicating that CFM configuration information must be delivered.
> 
>     IFLA_BRIDGE_CFM:
>         Points to the CFM information.
> 
>     IFLA_BRIDGE_CFM_MEP_CREATE_INFO:
>         This indicate that MEP instance create parameters are following.
>     IFLA_BRIDGE_CFM_MEP_CONFIG_INFO:
>         This indicate that MEP instance config parameters are following.
>     IFLA_BRIDGE_CFM_CC_CONFIG_INFO:
>         This indicate that MEP instance CC functionality
>         parameters are following.
>     IFLA_BRIDGE_CFM_CC_RDI_INFO:
>         This indicate that CC transmitted CCM PDU RDI
>         parameters are following.
>     IFLA_BRIDGE_CFM_CC_CCM_TX_INFO:
>         This indicate that CC transmitted CCM PDU parameters are
>         following.
>     IFLA_BRIDGE_CFM_CC_PEER_MEP_INFO:
>         This indicate that the added peer MEP IDs are following.
> 
>     Request filter RTEXT_FILTER_CFM_STATUS:
>     Indicating that CFM status information must be delivered.
> 
>     IFLA_BRIDGE_CFM:
>         Points to the CFM information.
> 
>     IFLA_BRIDGE_CFM_MEP_STATUS_INFO:
>         This indicate that the MEP instance status are following.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO:
>         This indicate that the peer MEP status are following.
> 
> CFM nested attribute has the following attributes in next level.
> 
> SETLINK and GETLINK RTEXT_FILTER_CFM_CONFIG:
>     IFLA_BRIDGE_CFM_MEP_CREATE_INSTANCE:
>         The created MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_MEP_CREATE_DOMAIN:
>         The created MEP domain.
>         The type is u32 (br_cfm_domain).
>         It must be BR_CFM_PORT.
>         This means that CFM frames are transmitted and received
>         directly on the port - untagged. Not in a VLAN.
>     IFLA_BRIDGE_CFM_MEP_CREATE_DIRECTION:
>         The created MEP direction.
>         The type is u32 (br_cfm_mep_direction).
>         It must be BR_CFM_MEP_DIRECTION_DOWN.
>         This means that CFM frames are transmitted and received on
>         the port. Not in the bridge.
>     IFLA_BRIDGE_CFM_MEP_CREATE_IFINDEX:
>         The created MEP residence port ifindex.
>         The type is u32 (ifindex).
> 
>     IFLA_BRIDGE_CFM_MEP_DELETE_INSTANCE:
>         The deleted MEP instance number.
>         The type is u32.
> 
>     IFLA_BRIDGE_CFM_MEP_CONFIG_INSTANCE:
>         The configured MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_MEP_CONFIG_UNICAST_MAC:
>         The configured MEP unicast MAC address.
>         The type is 6*u8 (array).
>         This is used as SMAC in all transmitted CFM frames.
>     IFLA_BRIDGE_CFM_MEP_CONFIG_MDLEVEL:
>         The configured MEP unicast MD level.
>         The type is u32.
>         It must be in the range 1-7.
>         No CFM frames are passing through this MEP on lower levels.
>     IFLA_BRIDGE_CFM_MEP_CONFIG_MEPID:
>         The configured MEP ID.
>         The type is u32.
>         It must be in the range 0-0x1FFF.
>         This MEP ID is inserted in any transmitted CCM frame.
> 
>     IFLA_BRIDGE_CFM_CC_CONFIG_INSTANCE:
>         The configured MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_CONFIG_ENABLE:
>         The Continuity Check (CC) functionality is enabled or disabled.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL:
>         The CC expected receive interval of CCM frames.
>         The type is u32 (br_cfm_ccm_interval).
>         This is also the transmission interval of CCM frames when enabled.
>     IFLA_BRIDGE_CFM_CC_CONFIG_EXP_MAID:
>         The CC expected receive MAID in CCM frames.
>         The type is CFM_MAID_LENGTH*u8.
>         This is MAID is also inserted in transmitted CCM frames.
> 
>     IFLA_BRIDGE_CFM_CC_PEER_MEP_INSTANCE:
>         The configured MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_PEER_MEPID:
>         The CC Peer MEP ID added.
>         The type is u32.
>         When a Peer MEP ID is added and CC is enabled it is expected to
>         receive CCM frames from that Peer MEP.
> 
>     IFLA_BRIDGE_CFM_CC_RDI_INSTANCE:
>         The configured MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_RDI_RDI:
>         The RDI that is inserted in transmitted CCM PDU.
>         The type is u32 (bool).
> 
>     IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE:
>         The configured MEP instance number.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC:
>         The transmitted CCM frame destination MAC address.
>         The type is 6*u8 (array).
>         This is used as DMAC in all transmitted CFM frames.
>     IFLA_BRIDGE_CFM_CC_CCM_TX_SEQ_NO_UPDATE:
>         The transmitted CCM frame update (increment) of sequence
>         number is enabled or disabled.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_CC_CCM_TX_PERIOD:
>         The period of time where CCM frame are transmitted.
>         The type is u32.
>         The time is given in seconds. SETLINK IFLA_BRIDGE_CFM_CC_CCM_TX
>         must be done before timeout to keep transmission alive.
>         When period is zero any ongoing CCM frame transmission
>         will be stopped.
>     IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV:
>         The transmitted CCM frame update with Interface Status TLV
>         is enabled or disabled.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_CC_CCM_TX_IF_TLV_VALUE:
>         The transmitted Interface Status TLV value field.
>         The type is u8.
>     IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV:
>         The transmitted CCM frame update with Port Status TLV is enabled
>         or disabled.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_CC_CCM_TX_PORT_TLV_VALUE:
>         The transmitted Port Status TLV value field.
>         The type is u8.
> 
> GETLINK RTEXT_FILTER_CFM_STATUS:
>     IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE:
>         The MEP instance number of the delivered status.
>         The type is u32.
>     IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN:
>         The MEP instance received CFM PDU with unexpected Opcode.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN:
>         The MEP instance received CFM PDU with unexpected version.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_MEP_STATUS_RX_LEVEL_LOW_SEEN:
>         The MEP instance received CCM PDU with MD level lower than
>         configured level. This frame is discarded.
>         The type is u32 (bool).
> 
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE:
>         The MEP instance number of the delivered status.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID:
>         The added Peer MEP ID of the delivered status.
>         The type is u32.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT:
>         The CCM defect status.
>         The type is u32 (bool).
>         True means no CCM frame is received for 3.25 intervals.
>         IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_RDI:
>         The last received CCM PDU RDI.
>         The type is u32 (bool).
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE:
>         The last received CCM PDU Port Status TLV value field.
>         The type is u8.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE:
>         The last received CCM PDU Interface Status TLV value field.
>         The type is u8.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN:
>         A CCM frame has been received from Peer MEP.
>         The type is u32 (bool).
>         This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_TLV_SEEN:
>         A CCM frame with TLV has been received from Peer MEP.
>         The type is u32 (bool).
>         This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
>     IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEQ_UNEXP_SEEN:
>         A CCM frame with unexpected sequence number has been received
>         from Peer MEP.
>         The type is u32 (bool).
>         When a sequence number is not one higher than previously received
>         then it is unexpected.
>         This is cleared after GETLINK IFLA_BRIDGE_CFM_CC_PEER_STATUS_INFO.
> 
> Reviewed-by: Horatiu Vultur  <horatiu.vultur@microchip.com>
> Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund@microchip.com>
> ---
>  include/uapi/linux/if_bridge.h | 125 ++++++
>  include/uapi/linux/rtnetlink.h |   2 +
>  net/bridge/Makefile            |   2 +-
>  net/bridge/br_cfm.c            |   5 +
>  net/bridge/br_cfm_netlink.c    | 724 +++++++++++++++++++++++++++++++++
>  net/bridge/br_netlink.c        |  67 ++-
>  net/bridge/br_private.h        |  31 ++
>  7 files changed, 940 insertions(+), 16 deletions(-)
>  create mode 100644 net/bridge/br_cfm_netlink.c
> 

Hi Henrik,
This patch definitely can be broken into a few smaller ones that add support for
configuring/dumping different cfm parts.

Also, and more importantly, the IFLA_AF_SPEC fix must go to -net as a separate
patch since the problem is there even now. After it gets accepted and -net is
merged into net-next you can rebase on top of it.

Thanks,
 Nik