Re: [Bridge] [PATCH net-next v3 0/8] net: bridge: add flush filtering support

[David Ahern <dsahern@kernel.org>]

On 4/12/22 7:22 AM, Nikolay Aleksandrov wrote:
> Hi,
> This patch-set adds support to specify filtering conditions for a bulk
> delete (flush) operation. This version uses a new nlmsghdr delete flag
> called NLM_F_BULK in combination with a new ndo_fdb_del_bulk op which is
> used to signal that the driver supports bulk deletes (that avoids
> pushing common mac address checks to ndo_fdb_del implementations and
> also has a different prototype and parsed attribute expectations, more
> info in patch 03). The new delete flag can be used for any RTM_DEL*
> type, implementations just need to be careful with older kernels which
> are doing non-strict attribute parses. Here I use the fact that mac

overall it looks fine to me. The rollout of BULK delete for other
commands will be slow so we need a way to reject the BULK flag if the
handler does not support it. One thought is to add another flag to
rtnl_link_flags (e.g., RTNL_FLAG_BULK_DEL_SUPPORTED) and pass that flag
in for handlers that handle bulk delete and reject it for others in core
rtnetlink code.