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Date: Fri, 12 Jan 2018 09:48:33 +0100 From: Jiri Benc <jbenc@...hat.com> To: "Mahesh Bandewar (महेश बंडेवार)" <maheshb@...gle.com> Cc: liuqifa@...wei.com, David Miller <davem@...emloft.net>, dsahern@...il.com, mschiffer@...verse-factory.net, idosch@...lanox.com, fw@...len.de, kjlx@...pleofstupid.com, girish.moodalbail@...cle.com, sainath.grandhi@...el.com, linux-netdev <netdev@...r.kernel.org>, weiyongjun1@...wei.com, chenweilong@...wei.com, maowenan@...wei.com, wangyufen@...wei.com, yuehaibing@...wei.com, liujian56@...wei.com, liuzhe24@...wei.com, wangkefeng.wang@...wei.com, dingtianhong@...wei.com Subject: Re: [PATCH V2] ipvlan: fix ipvlan MTU limits On Fri, 12 Jan 2018 09:34:13 +0100, Jiri Benc wrote: > I don't think this works currently. When someone (does not have to be > you, it can be a management software running in background) sets the > MTU to the current value, the magic behavior is lost without any way to > restore it (unless I'm missing a way to restore it, see my question > above). So any user that depends on the magic behavior is broken anyway > even now. Upon further inspection, it seems that currently, slaves always follow master's MTU without a way to change it. Tough situation. Even implementing user space toggleable mtu_adj could break users in the way I described. But it seems to be the lesser evil, at least there would be a way to unbreak the scripts with one line addition. But it's absolute must to have this visible to the user space and changeable. Something like this: # ip a 123: ipvlan0: <FLAGS> mtu 1500 (auto) qdisc ... # ip l s ipvlan0 mtu 1400 # ip a 123: ipvlan0: <FLAGS> mtu 1400 qdisc ... # ip l s ipvlan0 mtu auto # ip a 123: ipvlan0: <FLAGS> mtu 1500 (auto) qdisc ... Jiri
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