netdev - Re: [patch net-next v4 00/10] net: sched: allow qdiscs to share filter block instances

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Message-Id: <20180104.104521.1842347831974087325.davem@davemloft.net>
Date:   Thu, 04 Jan 2018 10:45:21 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jhs@...atatu.com
Cc:     jiri@...nulli.us, kubakici@...pl, dsahern@...il.com,
        netdev@...r.kernel.org, xiyou.wangcong@...il.com,
        mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, ogerlitz@...lanox.com,
        john.fastabend@...il.com, daniel@...earbox.net
Subject: Re: [patch net-next v4 00/10] net: sched: allow qdiscs to share
 filter block instances

From: Jamal Hadi Salim <jhs@...atatu.com>
Date: Thu, 4 Jan 2018 07:41:54 -0500

> I agree with Jiri - if you consciously choose to share there should
> be no suprises with what filters get applied.

Wrong.  It is not always the case that the two entities making changes
are coordinated explicitly.

Block operations shared across devices must therefore be _explicit_.

Any other behavior will result in surprised and unintended
consequences.