From: Jamal Hadi Salim <jhs@mojatatu•com>
To: Jiri Pirko <jiri@resnulli•us>, Thomas Graf <tgraf@suug•ch>
Cc: Neil Horman <nhorman@tuxdriver•com>,
Florian Fainelli <f.fainelli@gmail•com>,
netdev <netdev@vger•kernel.org>,
David Miller <davem@davemloft•net>,
andy@greyhouse•net, dborkman@redhat•com, ogerlitz@mellanox•com,
jesse@nicira•com, pshelar@nicira•com, azhou@nicira•com,
Ben Hutchings <ben@decadent•org.uk>,
Stephen Hemminger <stephen@networkplumber•org>,
jeffrey.t.kirsher@intel•com, vyasevic <vyasevic@redhat•com>,
Cong Wang <xiyou.wangcong@gmail•com>,
John Fastabend <john.r.fastabend@intel•com>,
Eric Dumazet <edumazet@google•com>,
Scott Feldman <sfeldma@cumulusnetworks•com>,
Lennert Buytenhek <buytenh@wantstofly•org>
Subject: Re: [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath
Date: Wed, 26 Mar 2014 07:00:53 -0400 [thread overview]
Message-ID: <5332B365.6050807@mojatatu.com> (raw)
In-Reply-To: <20140326072148.GB2869@minipsycho.orion>
On 03/26/14 03:21, Jiri Pirko wrote:
>
> Creating bonding of the switch ports does not fit into the picture at
> all. These port netdevices are just a representation of a port. Not
> actual netdevice where the data goes through.
>
> Please consider the case I gave already to this thread:
>
> switch chip
> ------------------------
> | | | | | | | CPU
> p1 p2 ...pn px py MNGMNT -----------
> | | | pcie
> | | | ---------------
> | | | | NIC0 NIC1
> | | ---pcie----- | |
> | ------someMII------- |
> ---------someMII-----------
>
> NIC0 and NIC1 are ordinary NICs like 8139too for example with no
> notion they are connected to a switch. They as completely
> independent on the mngmnt iface.
>
> There, actual data is coming through NIC0 and NIC1 which is
> completely separated
> from the p1...pn,px.px port representations.
>
> And if you understand it this way, it makes perfect sense to have a
> master device
> for these port representations.
>
I think you may be looking at some specific board design which has those
two NICs; there are typically many variations of such boards and they
have to be each dealt with slightly differently by whoever is porting.
Important detail is:
we already know how to deal with NICs - remove them from the diagram
and then the discussion is about the switch chip. I am assuming
the MNGMT interface is where the control is going to be. i.e
I can send table updates there, control the different port
charasterstics etc.
So Neil's option #1 is to have a driver controlling that interface
(->priv).
There's probably some DMA engine's for the datapath for one or more
of the ports this driver exposes...
Replace PCIE with DSA, a simulation chip, whatever the gazillion
crazy interfaces the openwrt guys have to deal with and we have
ourselves a consistent interface.
> Btw note this model fits into existing DSA as well I believe. The actual DSA
> devices whould act as NIC0, NIC1 and what would be added is the switch
> representation (couple of more netdevices to represent actual HW ports and
> their master)
>
Refer to my comments above.
cheers,
jamal
next prev parent reply other threads:[~2014-03-26 11:00 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 15:33 [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath Jiri Pirko
2014-03-19 15:33 ` [patch net-next RFC 1/4] openvswitch: split flow structures into ovs specific and generic ones Jiri Pirko
2014-03-20 13:04 ` Thomas Graf
2014-03-19 15:33 ` [patch net-next RFC 2/4] net: introduce switchdev API Jiri Pirko
2014-03-20 13:59 ` Thomas Graf
2014-03-20 14:18 ` Jiri Pirko
2014-03-20 14:43 ` Nikolay Aleksandrov
2014-03-20 15:42 ` Jiri Pirko
2014-03-19 15:33 ` [patch net-next RFC 3/4] openvswitch: Introduce support for switchdev based datapath Jiri Pirko
2014-03-19 15:33 ` [patch net-next RFC 4/4] net: introduce dummy switch Jiri Pirko
2014-03-20 11:49 ` [patch net-next RFC 0/4] introduce infrastructure for support of switch chip datapath Jamal Hadi Salim
2014-03-20 12:40 ` Jiri Pirko
2014-03-20 17:21 ` Florian Fainelli
2014-03-21 12:04 ` Jamal Hadi Salim
2014-03-22 9:48 ` Jiri Pirko
2014-03-24 23:07 ` Jamal Hadi Salim
2014-03-25 17:39 ` Neil Horman
2014-03-25 18:00 ` Thomas Graf
2014-03-25 19:35 ` Neil Horman
2014-03-25 20:11 ` Florian Fainelli
2014-03-25 20:31 ` Neil Horman
2014-03-25 21:22 ` Jamal Hadi Salim
2014-03-25 21:26 ` Thomas Graf
2014-03-25 21:42 ` Florian Fainelli
2014-03-25 21:54 ` Thomas Graf
2014-03-26 10:55 ` Neil Horman
2014-03-26 5:37 ` Roopa Prabhu
2014-03-26 10:54 ` Jamal Hadi Salim
2014-03-26 15:31 ` John W. Linville
2014-03-26 16:54 ` Roopa Prabhu
2014-03-26 16:59 ` Jiri Pirko
2014-03-26 17:29 ` Florian Fainelli
2014-03-26 17:35 ` Jiri Pirko
2014-03-26 17:58 ` Florian Fainelli
2014-03-26 18:14 ` Jiri Pirko
2014-03-26 18:29 ` Hannes Frederic Sowa
2014-03-26 18:30 ` Florian Fainelli
2014-03-26 21:51 ` Jamal Hadi Salim
2014-03-26 22:22 ` Florian Fainelli
2014-03-26 22:53 ` Jamal Hadi Salim
2014-03-26 23:16 ` Florian Fainelli
2014-03-27 6:56 ` Jiri Pirko
2014-03-27 10:39 ` Jamal Hadi Salim
2014-03-27 10:50 ` Jiri Pirko
2014-03-27 11:12 ` Jamal Hadi Salim
2014-03-27 11:16 ` Jiri Pirko
2014-03-27 14:10 ` Sergey Ryazanov
2014-03-27 16:41 ` Florian Fainelli
2014-03-27 16:57 ` Jiri Pirko
2014-03-27 16:59 ` Thomas Graf
2014-03-27 20:32 ` Sergey Ryazanov
2014-03-27 21:20 ` Florian Fainelli
2014-03-27 21:55 ` Jamal Hadi Salim
2014-03-28 6:28 ` Jiri Pirko
2014-03-30 12:08 ` Alon Harel
2014-03-27 21:41 ` Jamal Hadi Salim
2014-03-27 16:55 ` Jiri Pirko
2014-03-27 19:58 ` Sergey Ryazanov
2014-03-27 20:01 ` Florian Fainelli
2014-03-27 20:04 ` Sergey Ryazanov
2014-03-27 21:47 ` Jamal Hadi Salim
2014-03-27 21:54 ` Florian Fainelli
2014-03-27 21:59 ` Jamal Hadi Salim
2014-03-27 22:19 ` Florian Fainelli
2014-03-27 23:42 ` Thomas Graf
2014-03-27 23:46 ` Florian Fainelli
2014-03-26 17:57 ` Roopa Prabhu
2014-03-26 18:09 ` Florian Fainelli
2014-03-27 13:46 ` John W. Linville
2014-03-26 17:47 ` Roopa Prabhu
2014-03-26 18:03 ` Jiri Pirko
2014-03-26 21:27 ` Roopa Prabhu
2014-03-26 21:31 ` Jiri Pirko
2014-03-27 15:35 ` Roopa Prabhu
2014-03-27 16:10 ` Jiri Pirko
2014-04-01 19:13 ` Scott Feldman
2014-04-02 6:41 ` Jiri Pirko
2014-04-02 15:37 ` Scott Feldman
2014-04-02 14:32 ` Andy Gospodarek
2014-04-02 15:25 ` John W. Linville
2014-04-02 16:15 ` Scott Feldman
2014-04-02 16:47 ` Florian Fainelli
2014-04-02 21:52 ` Thomas Graf
2014-04-02 19:29 ` John W. Linville
2014-04-02 19:54 ` Scott Feldman
2014-04-02 20:06 ` John W. Linville
2014-04-02 20:04 ` Stephen Hemminger
2014-04-02 20:23 ` Jiri Pirko
2014-04-02 20:38 ` John W. Linville
2014-04-02 21:36 ` Thomas Graf
2014-03-25 20:56 ` Jamal Hadi Salim
2014-03-25 21:19 ` Thomas Graf
2014-03-25 21:24 ` Jamal Hadi Salim
2014-03-26 7:21 ` Jiri Pirko
2014-03-26 11:00 ` Jamal Hadi Salim [this message]
2014-03-26 11:06 ` Jamal Hadi Salim
2014-03-26 11:31 ` Jamal Hadi Salim
2014-03-26 13:20 ` Jiri Pirko
2014-03-26 13:23 ` Jamal Hadi Salim
2014-03-26 13:17 ` Jiri Pirko
2014-03-26 11:10 ` Neil Horman
2014-03-26 11:29 ` Thomas Graf
2014-03-26 12:58 ` Jamal Hadi Salim
2014-03-26 15:22 ` John W. Linville
2014-03-26 21:36 ` Jamal Hadi Salim
2014-03-26 18:21 ` Neil Horman
2014-03-26 19:11 ` Florian Fainelli
2014-03-26 22:44 ` Jamal Hadi Salim
2014-03-26 23:15 ` Thomas Graf
2014-03-26 23:21 ` Florian Fainelli
2014-03-27 15:26 ` Neil Horman
2014-03-27 21:33 ` Jamal Hadi Salim
2014-03-26 19:24 ` Hannes Frederic Sowa
2014-03-27 13:43 ` John W. Linville
2014-03-26 12:19 ` Jamal Hadi Salim
2014-03-26 15:27 ` John W. Linville
2014-03-25 18:33 ` Florian Fainelli
2014-03-25 19:40 ` Neil Horman
2014-03-25 20:00 ` Florian Fainelli
2014-03-25 21:39 ` tgraf
2014-03-25 22:08 ` Jamal Hadi Salim
2014-03-26 5:48 ` Roopa Prabhu
2014-03-25 20:46 ` Jamal Hadi Salim
2014-03-26 7:24 ` Jiri Pirko
2014-03-22 9:40 ` Jiri Pirko
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