netdev - Re: [PATCH net-next, v5] netlink: add IGMP/MLD join/leave notifications

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Message-ID: <Z1eXd2HROVbFM6mt@fedora>
Date: Tue, 10 Dec 2024 01:20:55 +0000
From: Hangbin Liu <liuhangbin@...il.com>
To: Yuyang Huang <yuyanghuang@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, David Ahern <dsahern@...nel.org>,
	roopa@...ulusnetworks.com, jiri@...nulli.us,
	stephen@...workplumber.org, jimictw@...gle.com, prohr@...gle.com,
	nicolas.dichtel@...nd.com, andrew@...n.ch, netdev@...r.kernel.org,
	Maciej Żenczykowski <maze@...gle.com>,
	Lorenzo Colitti <lorenzo@...gle.com>,
	Patrick Ruddy <pruddy@...tta.att-mail.com>
Subject: Re: [PATCH net-next, v5] netlink: add IGMP/MLD join/leave
 notifications

On Fri, Dec 06, 2024 at 01:10:25PM +0900, Yuyang Huang wrote:
> This change introduces netlink notifications for multicast address
> changes. The following features are included:
> * Addition and deletion of multicast addresses are reported using
>   RTM_NEWMULTICAST and RTM_DELMULTICAST messages with AF_INET and
>   AF_INET6.
> * Two new notification groups: RTNLGRP_IPV4_MCADDR and
>   RTNLGRP_IPV6_MCADDR are introduced for receiving these events.
> 
> This change allows user space applications (e.g., ip monitor) to
> efficiently track multicast group memberships by listening for netlink
> events. Previously, applications relied on inefficient polling of
> procfs, introducing delays. With netlink notifications, applications
> receive realtime updates on multicast group membership changes,
> enabling more precise metrics collection and system monitoring. 
> 
> This change also unlocks the potential for implementing a wide range
> of sophisticated multicast related features in user space by allowing
> applications to combine kernel provided multicast address information
> with user space data and communicate decisions back to the kernel for
> more fine grained control. This mechanism can be used for various
> purposes, including multicast filtering, IGMP/MLD offload, and
> IGMP/MLD snooping.
> 
> Cc: Maciej Żenczykowski <maze@...gle.com>
> Cc: Lorenzo Colitti <lorenzo@...gle.com>
> Co-developed-by: Patrick Ruddy <pruddy@...tta.att-mail.com>
> Signed-off-by: Patrick Ruddy <pruddy@...tta.att-mail.com>
> Link: https://lore.kernel.org/r/20180906091056.21109-1-pruddy@vyatta.att-mail.com
> Signed-off-by: Yuyang Huang <yuyanghuang@...gle.com>
> ---

Reviewed-by: Hangbin Liu <liuhangbin@...il.com>