netdev - rtnetlink dump operations also share the rrtnl

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Message-ID: <d2d3f366-4082-cc0f-7b3a-73573ef887b6@ucloud.cn>
Date:   Mon, 10 Jun 2019 16:22:42 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: rtnetlink dump operations also share the rrtnl_mutex

Hi all,

When a netlink_route socket was created, the nlk->cb_mutex is get through nl_table[NETLINK_ROUTE].cb_mutex which is the rtnl_mutex.

So all the netlink_route dump operation can contend for each other (ip l, ip a, ip r, tc ls). It will also contend with other RTM_NEW/DEL operations.

So there can be a good way for each msgtype have their own mutex for dump operations?

BR

wenxu