netdev - Re: [PATCH v2 17/28] thunderbolt: Add support for full PCIe daisy chains

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Date:   Mon, 25 Mar 2019 13:22:06 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     linux-kernel@...r.kernel.org,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Andreas Noever <andreas.noever@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 17/28] thunderbolt: Add support for full PCIe daisy
 chains

On Mon, Mar 25, 2019 at 12:16:16PM +0100, Lukas Wunner wrote:
> Yes, but my point is that it doesn't make much sense to establish a tunnel
> between a switch and one of its parent switches unless that parent switch
> is reachable from the root switch over a PCI tunnel or a series of PCI
> tunnels.
>
> It may be worth checking that condition, or, if new tunnels are established
> top-down in the daisy-chain and tunnel establishment has failed for a
> switch, to not establish tunnels for switches beyond that one.

OK, got it :)