linux-kernel - Re: [net-next v2 08/11] bridge: cfm: Netlink Notifications.

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Date:   Tue, 6 Oct 2020 14:49:29 +0000
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        "henrik.bjoernlund@...rochip.com" <henrik.bjoernlund@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jiri@...lanox.com" <jiri@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Roopa Prabhu <roopa@...dia.com>,
        "idosch@...lanox.com" <idosch@...lanox.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>
CC:     "horatiu.vultur@...rochip.com" <horatiu.vultur@...rochip.com>
Subject: Re: [net-next v2 08/11] bridge: cfm: Netlink Notifications.

On Thu, 2020-10-01 at 10:30 +0000, Henrik Bjoernlund wrote:
> This is the implementation of Netlink notifications out of CFM.
> 
> Notifications are initiated whenever a state change happens in CFM.
> 
> 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.
> 
> IFLA_BRIDGE_CFM_MEP_STATUS_INSTANCE:
>     The MEP instance number of the delivered status.
>     The type is NLA_U32.
> IFLA_BRIDGE_CFM_MEP_STATUS_OPCODE_UNEXP_SEEN:
>     The MEP instance received CFM PDU with unexpected Opcode.
>     The type is NLA_U32 (bool).
> IFLA_BRIDGE_CFM_MEP_STATUS_VERSION_UNEXP_SEEN:
>     The MEP instance received CFM PDU with unexpected version.
>     The type is NLA_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 NLA_U32 (bool).
> 
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_INSTANCE:
>     The MEP instance number of the delivered status.
>     The type is NLA_U32.
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_PEER_MEPID:
>     The added Peer MEP ID of the delivered status.
>     The type is NLA_U32.
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_CCM_DEFECT:
>     The CCM defect status.
>     The type is NLA_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 NLA_U32 (bool).
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_PORT_TLV_VALUE:
>     The last received CCM PDU Port Status TLV value field.
>     The type is NLA_U8.
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_IF_TLV_VALUE:
>     The last received CCM PDU Interface Status TLV value field.
>     The type is NLA_U8.
> IFLA_BRIDGE_CFM_CC_PEER_STATUS_SEEN:
>     A CCM frame has been received from Peer MEP.
>     The type is NLA_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 NLA_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 NLA_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@...rochip.com>
> Signed-off-by: Henrik Bjoernlund  <henrik.bjoernlund@...rochip.com>
> ---
>  net/bridge/br_cfm.c         | 48 ++++++++++++++++++++++++
>  net/bridge/br_cfm_netlink.c | 27 +++++++++-----
>  net/bridge/br_netlink.c     | 73 ++++++++++++++++++++++++++++++++-----
>  net/bridge/br_private.h     | 22 ++++++++++-
>  4 files changed, 148 insertions(+), 22 deletions(-)
> 
[snip]
>  	return !hlist_empty(&br->mep_list);
> diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
> index 7bdf890b8ccc..5f81262c9caa 100644
> --- a/net/bridge/br_cfm_netlink.c
> +++ b/net/bridge/br_cfm_netlink.c
> @@ -325,8 +325,8 @@ static int br_cc_ccm_tx_parse(struct net_bridge *br, struct nlattr *attr,
>  			      struct netlink_ext_ack *extack)
>  {
>  	struct nlattr *tb[IFLA_BRIDGE_CFM_CC_CCM_TX_MAX + 1];
> -	u32 instance;
>  	struct br_cfm_cc_ccm_tx_info tx_info;
> +	u32 instance;
>  	int err;

This hunk is unnecessary as it's new code added by this set, just add it
correctly in the first place and drop this change.

Thanks,
 Nik