netdev - Re: [patch net-next v6 4/4] igb/igbvf: implement ndo_get_phys_port

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Date:	Thu, 22 Aug 2013 03:39:10 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Jiri Pirko <jiri@...nulli.us>, aaron.f.brown@...el.com
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	stephen@...workplumber.org, Narendra_K@...l.com,
	bhutchings@...arflare.com, or.gerlitz@...il.com,
	carolyn.wyborny@...el.com, gregory.v.rose@...el.com,
	vyasevic@...hat.com, amwang@...hat.com, johannes@...solutions.net
Subject: Re: [patch net-next v6 4/4] igb/igbvf: implement
 ndo_get_phys_port_id

On Mon, 2013-07-29 at 18:16 +0200, Jiri Pirko wrote:
> igb driver generated random number which will identify physical port.
> This id is available via ndo_get_phys_port_id directly on igb netdev.
> Also, id is passed to igbvf using mailbox. After that, it is available
> via
> ndo_get_phys_port_id on igbvf netdev as well.
> 
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> ---
>  drivers/net/ethernet/intel/igb/e1000_mbx.h |  1 +
>  drivers/net/ethernet/intel/igb/igb.h       |  3 +++
>  drivers/net/ethernet/intel/igb/igb_main.c  | 37
> ++++++++++++++++++++++++++++-
>  drivers/net/ethernet/intel/igbvf/igbvf.h   |  4 ++++
>  drivers/net/ethernet/intel/igbvf/mbx.h     |  1 +
>  drivers/net/ethernet/intel/igbvf/netdev.c  | 38
> ++++++++++++++++++++++++++++++
>  drivers/net/ethernet/intel/igbvf/vf.c      | 34
> ++++++++++++++++++++++++++
>  drivers/net/ethernet/intel/igbvf/vf.h      |  1 +
>  8 files changed, 118 insertions(+), 1 deletion(-)

Jiri-

Validation ran into a couple of issues with this patch.  Here is what
Aaron found when testing this patch...

Aaron Brown wrote:
I think I have to fail this, it seems to have an issue with
initialization.  When I first create a vf via sysfs the pys_port_id file
is created along with the other sysfs files for the vf, however an
attempt to cat out the value returns " Operation not supported".  At
this point the vf is still down, if I bring it up (or simply unload /
reload the igbvf driver) I can then cat the file successfully and the vf
interface phys_port_id matches the phys_port_id of the pf.  This is
testing from bare metal, a console session showing this behavior
follows:

u1304:[0]/sys> find . -iname phys_port_id
./devices/pci0000:00/0000:00:01.0/0000:07:00.0/net/eth0/phys_port_id
./devices/pci0000:00/0000:00:01.0/0000:07:00.1/net/eth1/phys_port_id
./devices/virtual/net/sit0/phys_port_id
./devices/virtual/net/lo/phys_port_id
u1304:[0]/sys> cat devices/pci0000:00/0000:00:01.0/0000:07:00.0/net/eth0/phys_port_id
5ece9fbd9cd51546982e15c1f2c11e25
u1304:[0]/sys>

So far so good, now make a few vfs and check for new phys_port_id sysfs files.

u1304:[0]/sys> find . -iname sriov_numvfs
./devices/pci0000:00/0000:00:01.0/0000:07:00.0/sriov_numvfs
./devices/pci0000:00/0000:00:01.0/0000:07:00.1/sriov_numvfs
u1304:[0]/sys> echo 2 > devices/pci0000:00/0000:00:01.0/0000:07:00.0/sriov_numvfs
u1304:[0]/sys> find . -iname phys_port_id                                       ./devices/pci0000:00/0000:00:01.0/0000:07:00.0/net/eth0/phys_port_id
./devices/pci0000:00/0000:00:01.0/0000:07:00.1/net/eth1/phys_port_id
./devices/pci0000:00/0000:00:01.0/0000:07:10.0/net/eth2/phys_port_id
./devices/pci0000:00/0000:00:01.0/0000:07:10.2/net/eth3/phys_port_id
./devices/virtual/net/sit0/phys_port_id
./devices/virtual/net/lo/phys_port_id
u1304:[0]/sys>

The first vf is eth2, attempt to cat out it's phys_port_id

u1304:[0]/sys> cat ./devices/pci0000:00/0000:00:01.0/0000:07:10.0/net/eth2/phys_port_id
cat: ./devices/pci0000:00/0000:00:01.0/0000:07:10.0/net/eth2/phys_port_id: Operation not supported
u1304:[0]/sys>

But, if I bring the interface up (or unload / load the igbvf driver) I then am able to cat the phys_port_id of the vf and it matches the phys_port_id of the physical interface.

u1304:[0]/sys> ifconfig eth2 u1304-2
u1304:[0]/sys> cat ./devices/pci0000:00/0000:00:01.0/0000:07:10.0/net/eth2/phys_port_id
5ece9fbd9cd51546982e15c1f2c11e25
u1304:[0]/sys>

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