From: David Ahern <dsahern@gmail.com>
To: Jakub Kicinski <jakub.kicinski@netronome.com>,
Jiri Pirko <jiri@resnulli.us>
Cc: davem@davemloft.net, oss-drivers@netronome.com, netdev@vger.kernel.org
Subject: Re: [PATCH net-next 2/8] devlink: add PF and VF port flavours
Date: Thu, 28 Feb 2019 09:24:33 -0700 [thread overview]
Message-ID: <0671e26e-2bb5-5360-e062-70abfaf1faf7@gmail.com> (raw)
In-Reply-To: <20190227144239.55481885@cakuba.netronome.com>
On 2/27/19 3:42 PM, Jakub Kicinski wrote:
> On Wed, 27 Feb 2019 21:17:27 +0100, Jiri Pirko wrote:
>> Wed, Feb 27, 2019 at 06:23:26PM CET, jakub.kicinski@netronome.com wrote:
>>> On Wed, 27 Feb 2019 13:41:35 +0100, Jiri Pirko wrote:
>>>> Wed, Feb 27, 2019 at 01:23:27PM CET, jiri@resnulli.us wrote:
>>>>> Tue, Feb 26, 2019 at 07:24:30PM CET, jakub.kicinski@netronome.com wrote:
>>>>>> Current port flavours cover simple switches and DSA. Add PF
>>>>>> and VF flavours to cover "switchdev" SR-IOV NICs.
>>>>>>
>>>>>> Example devlink user space output:
>>>>>>
>>>>>> $ devlink port
>>>>>> pci/0000:82:00.0/0: type eth netdev p4p1 flavour physical
>>>>>> pci/0000:82:00.0/10000: type eth netdev eth0 flavour pcie_pf pf 0
>>>>>> pci/0000:82:00.0/10001: type eth netdev eth1 flavour pcie_vf pf 0 vf 0
>>>>>> pci/0000:82:00.0/10002: type eth netdev eth2 flavour pcie_vf pf 0 vf 1
>>>>>
>>>>> Wait a second, howcome pf and vfs have the same PCI address?
>>>>
>>>> Oh, I think you have these as eswitch port representors. Confusing...
>>>
>>> FWIW I don't like the word representor, its a port. We don't call
>>> physical ports "representors" even though from ASIC's point of view
>>> they are exactly the same.
>>
>> My point is, they are not PFs and VFs. We have to find a way to clearly
>> see what's what.
>
> Okay, so let me explain the way I see it, and you can explain your way
> or tell me where you disagree. Those devlink ports and netdevs are pf
> ports and vf ports, which most refer to as "representor". If one sends
> packets to the netdev indicated in DEVLINK_ATTR_PORT_NETDEV_*
> attributes they will _egress_ the switch from that port. For physical
> port that means going onto the Ethernet or IB wire. For PCIe it means
> getting DMAed over the PCIe link to host memory.
>
> There is a netdev construct on the host which is in charge of that
> host memory. Maybe we shall call that host netdev?
>
> (I said I don't like "representor" for the reason that people don't
> refer to the physical port as "representor" even though it has exactly
> the semantics we are following. This distinction between behaviour of
> physical and PCI ports is what leads to confusion, I think.)
>
> Let me bring out the moose :)
>
> HOST A || HOST B
> ||
> PF A | V | V | V | V || PF B | V | V | V
> |*F |*F |*F |*F ... || |*F |*F |*F ...
> *port A0 |*port A1 | 0 | 1 | 2 | 3 ||*port B0 |*port B1 | 0 | 1 | 2
> ||
> PCI Express link || PCI Express link
> \ \ \ | | | | | / / /
> \ \ \ | | | | | / / /
> /\ \______\______\'___|___|__________|_______'____/___/___/__ /\
> || |+PF0s0|+PF0s1 |+VF0|+VF1| ...| |+PF1s0|+PF1s1|+VF0|+VF1| ||
> i || |------ ------ ----- ---- ----|--- ------ ------ ---- ----| || i
> d n H || | <<========== | || d n H
> e s O || | ==========>> | || e s O
> v t S || | SR-IOV e-switch | || v t S
> l a T || | <<========== | || l a T
> i n || | ==========>> | || i n
> n c A || | ________ _________ ________ | || n c B
> k e || | |+Phys 0 |+Phys 1 |+Phys 2 | | || k e
> || \---------------------------------------------------------/ ||
> \/ | | | \/
> | | |
> || ||
> MAC 0 || MAC 1 || MAC 2
> || ||
>
> Things marked with + are devlink ports and have port (-repr-) netdevs
> (including physical ports).
> Things marked with * are host netdevs, don't have devlink ports.
>
That would a good update to the commit message or cover letter.
next prev parent reply other threads:[~2019-02-28 16:24 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-26 18:24 [PATCH net-next 0/8] devlink: add PF and VF port flavours Jakub Kicinski
2019-02-26 18:24 ` [PATCH net-next 1/8] nfp: split devlink port init from registration Jakub Kicinski
2019-02-26 18:24 ` [PATCH net-next 2/8] devlink: add PF and VF port flavours Jakub Kicinski
2019-02-27 12:16 ` Jiri Pirko
2019-03-04 4:59 ` Parav Pandit
2019-03-04 7:30 ` Jiri Pirko
2019-03-20 17:29 ` Abodunrin, Akeem G
2019-03-21 12:26 ` Jiri Pirko
2019-02-27 12:23 ` Jiri Pirko
2019-02-27 12:41 ` Jiri Pirko
2019-02-27 17:23 ` Jakub Kicinski
2019-02-27 20:17 ` Jiri Pirko
2019-02-27 22:42 ` Jakub Kicinski
2019-02-28 8:44 ` Jiri Pirko
2019-02-28 16:08 ` Jakub Kicinski
2019-02-28 16:24 ` David Ahern [this message]
2019-02-26 18:24 ` [PATCH net-next 3/8] nfp: register devlink ports of all reprs Jakub Kicinski
2019-02-26 18:24 ` [PATCH net-next 4/8] devlink: allow subports on devlink PCI ports Jakub Kicinski
2019-02-27 12:37 ` Jiri Pirko
2019-02-27 18:30 ` Jakub Kicinski
2019-02-28 8:56 ` Jiri Pirko
2019-02-28 13:32 ` Jiri Pirko
2019-02-28 16:24 ` Jakub Kicinski
2019-03-01 7:25 ` Jiri Pirko
2019-03-01 16:04 ` Jakub Kicinski
2019-03-01 16:20 ` Jiri Pirko
2019-03-04 16:15 ` Jason Gunthorpe
2019-03-05 1:03 ` Jakub Kicinski
2019-03-05 1:30 ` Jason Gunthorpe
2019-03-05 2:11 ` Jakub Kicinski
2019-03-05 22:11 ` Jason Gunthorpe
2019-03-04 5:00 ` Parav Pandit
2019-02-26 18:24 ` [PATCH net-next 5/8] nfp: switch to devlink_port_get_phys_port_name() Jakub Kicinski
2019-02-26 18:24 ` [PATCH net-next 6/8] devlink: introduce port's peer netdevs Jakub Kicinski
2019-02-27 13:08 ` Jiri Pirko
2019-02-27 18:47 ` Jakub Kicinski
2019-02-28 9:00 ` Jiri Pirko
2019-02-28 16:36 ` Jakub Kicinski
2019-03-01 7:37 ` Jiri Pirko
2019-03-01 16:05 ` Jakub Kicinski
2019-03-04 5:07 ` Parav Pandit
2019-02-26 18:24 ` [PATCH net-next 7/8] nfp: expose PF " Jakub Kicinski
2019-02-26 18:24 ` [PATCH net-next 8/8] devlink: fix kdoc Jakub Kicinski
2019-02-27 13:13 ` Jiri Pirko
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