netdev - Re: [PATCHv3 net-next] bonding: 3ad: send ifinfo notify when mux state changed

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Date: Wed, 26 Jun 2024 11:22:21 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc: Jay Vosburgh <j.vosburgh@...il.com>, Andy Gospodarek
 <andy@...yhouse.net>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Ido Schimmel <idosch@...dia.com>,
 Jiri Pirko <jiri@...nulli.us>, Amit Cohen <amcohen@...dia.com>
Subject: Re: [PATCHv3 net-next] bonding: 3ad: send ifinfo notify when mux
 state changed

On 26/06/2024 10:51, Hangbin Liu wrote:
> Currently, administrators need to retrieve LACP mux state changes from
> the kernel DEBUG log using netdev_dbg and slave_dbg macros. To simplify
> this process, let's send the ifinfo notification whenever the mux state
> changes. This will enable users to directly access and monitor this
> information using the ip monitor command.
> 
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
> v3: forgot to use GFP_ATOMIC. (Nikolay Aleksandrov)
>     export symbol for rtmsg_ifinfo. It's weird that my build succeed with
>     tools/testing/selftests/drivers/net/bonding/config without export
>     the symbol, but build failed with tools/testing/selftests/net/config.
> v2: don't use call_netdevice_notifiers as it will case sleeping in atomic
>     context (Nikolay Aleksandrov)
> 
> After this patch, we can see the following info with `ip -d monitor link`
> 
> 7: veth1@if6: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc noqueue master bond0 state UP group default
>     link/ether 02:0a:04:c2:d6:21 brd ff:ff:ff:ff:ff:ff link-netns b promiscuity 0 allmulti 0 minmtu 68 maxmtu 65535
>     veth
>     bond_slave state BACKUP mii_status UP ... ad_aggregator_id 1 ad_actor_oper_port_state 143 ad_actor_oper_port_state_str <active,short_timeout,aggregating,in_sync,expired> ad_partner_oper_port_state 55 ad_partner_oper_port_state_str <active,short_timeout,aggregating,collecting,distributing> ...
> 7: veth1@if6: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc noqueue master bond0 state UP group default
>     link/ether 02:0a:04:c2:d6:21 brd ff:ff:ff:ff:ff:ff link-netns b promiscuity 0 allmulti 0 minmtu 68 maxmtu 65535
>     veth
>     bond_slave state ACTIVE mii_status UP ... ad_aggregator_id 1 ad_actor_oper_port_state 79 ad_actor_oper_port_state_str <active,short_timeout,aggregating,in_sync,defaulted> ad_partner_oper_port_state 1 ad_partner_oper_port_state_str <active> ...
> 7: veth1@if6: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc noqueue master bond0 state UP group default
>     link/ether 02:0a:04:c2:d6:21 brd ff:ff:ff:ff:ff:ff link-netns b promiscuity 0 allmulti 0 minmtu 68 maxmtu 65535
>     veth
>     bond_slave state ACTIVE mii_status UP ... ad_aggregator_id 1 ad_actor_oper_port_state 63 ad_actor_oper_port_state_str <active,short_timeout,aggregating,in_sync,collecting,distributing> ad_partner_oper_port_state 63 ad_partner_oper_port_state_str <active,short_timeout,aggregating,in_sync,collecting,distributing> ...
> ---
>  drivers/net/bonding/bond_3ad.c | 3 +++
>  net/core/rtnetlink.c           | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
> index c6807e473ab7..b57c5670b31a 100644
> --- a/drivers/net/bonding/bond_3ad.c
> +++ b/drivers/net/bonding/bond_3ad.c
> @@ -11,6 +11,7 @@
>  #include <linux/etherdevice.h>
>  #include <linux/if_bonding.h>
>  #include <linux/pkt_sched.h>
> +#include <linux/rtnetlink.h>
>  #include <net/net_namespace.h>
>  #include <net/bonding.h>
>  #include <net/bond_3ad.h>
> @@ -1185,6 +1186,8 @@ static void ad_mux_machine(struct port *port, bool *update_slave_arr)
>  		default:
>  			break;
>  		}
> +
> +		rtmsg_ifinfo(RTM_NEWLINK, port->slave->dev, 0, GFP_ATOMIC, 0, NULL);
>  	}
>  }
>  
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index eabfc8290f5e..4507bb8d5264 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -4116,6 +4116,7 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
>  	rtmsg_ifinfo_event(type, dev, change, rtnl_get_event(0), flags,
>  			   NULL, 0, portid, nlh);
>  }
> +EXPORT_SYMBOL(rtmsg_ifinfo);
>  
>  void rtmsg_ifinfo_newnet(int type, struct net_device *dev, unsigned int change,
>  			 gfp_t flags, int *new_nsid, int new_ifindex)

Looks good to me, thanks!
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>