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

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Date:   Tue, 12 Apr 2022 20:04:40 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
Cc:     roopa@...dia.com, idosch@...sch.org, kuba@...nel.org,
        davem@...emloft.net, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next v3 0/8] net: bridge: add flush filtering support

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.