netdev - Re: [PATCH 4/4] thunderbolt: Get rid of E2E workaround

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Date:   Mon, 15 Jun 2020 18:55:12 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Yehezkel Bernat <yehezkelshb@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Michael Jamet <michael.jamet@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Lukas Wunner <lukas@...ner.de>, netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] thunderbolt: Get rid of E2E workaround

On Mon, Jun 15, 2020 at 06:41:32PM +0300, Yehezkel Bernat wrote:
> > I think you are talking about the "prtstns" property in the network
> > driver. There we only set TBNET_MATCH_FRAGS_ID (bit 1). This is the
> > thing that get exposed to the other side of the connection and we never
> > announced support for full E2E.
> 
> 
> Ah, yes, this one, Thanks!
> As Windows driver uses it for flagging full-E2E, and we completely drop E2E
> support here, it may worth to mention there that this is what bit 2 is used in
> Windows so any reuse should consider the possible compatibility issue.

Note we only drop dead code in this patch. It is that workaround for
Falcon Ridge controller we actually never used.

I can add a comment to the network driver about the full E2E support
flag as a separate patch if you think it is useful.

The network protocol will be public soon I guess because USB4 spec
refers to "USB4 Inter-Domain Specification, Revision 1.0, [to be
published] – (USB4 Inter-Domain Specification)" so I would expect it to
be explained there as well.