Re: [E1000-devel] e1000 and 1000BASE-SX fibre channel support

[Shiro Y. <sh...@mi...>]

Hi Jesse,

With reference to your information, I understand that
whenever a fibre gigabit Ethernet adapter is active,
we always get a value of 1000Mbps. I guess I can use
it for the nominal value of ifSpeed defined in RFC1213.

Regarding the net-snmp capability of detecting 1000Mbps,
the original net-snmp doesn't come with this feature.
However, I wrote a simple patch which implements it.
I have tested it with a couple of gigabit Ether cards
(1000BASSE-T) so at least it works for some.

Anyway, thank you for your information, I find it very
useful.

Shiro

Brandeburg, Jesse wrote:

>>I am using linux kernel 2.4.21 and e1000 v.5.5.4 driver,
>>and encoutered a problem when excuting ioctl(SIOCGMIIPHY)
>>on 1000BASE-SX, a fibre channel gigabit ethernet card.
>>It appears as though the operation is not supported.
>>
>>Refering to the code, function e1000_ioctl() and
>>e1000_mii_ioctl() returns EOPNOTSUPP when adapter->hw.media_type
>>is not "e1000_media_type_copper", and I suspect this
>>could be the reason for the failure. I have tested ioctl()
>>with 1000BASE-T card and it has succeeded.
>>
>>What I would like to know is whether ioctl(SIOCGMIIPHY)
>>will be supported in near future release of e1000 or not.
>>I need this function to get correct network speed when
>>retrieving data via net-snmp snmpd daemon, and I would
>>appreciate any feedback from you.
>>
>>Best regards,
>>Shiro
> 
> 
> Greetings Shiro, that IOCTL is meant to report the phy address only,
> which
> our adapters only use 0.  Because of the way that Fiber works link speed
> and duplex is always 1Gigabit Full duplex if the media type is Fiber.
> There are not the same MII registers available when using a fiber PHY.
> 
> Get MIIPHY is not meant to return speed, in fact the ethtool IOCTLS are
> better suited to return link speed and duplex, (and will return the
> right thing for fiber and copper)
> 
> I doubt that we will be changing the IOCTL interface to fix net-snmp.
> Are you sure that net-snmp works correctly on (other -non e1000) fiber
> adapters?
> 
> Also as a side note our e1000 adapters are not fiber channel, just fiber
> gigabit Ethernet adapters.
> 
> Let us know if you have other questions.
> Jesse