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List:       e1000-devel
Subject:    Re: [E1000-devel] ixgbe for 10 GbE SFP+ without CS4227 phy
From:       "Fujinaka, Todd" <todd.fujinaka () intel ! com>
Date:       2020-06-19 15:43:01
Message-ID: BYAPR11MB3606FEEB87C687E2A687CEF5EF980 () BYAPR11MB3606 ! namprd11 ! prod ! outlook ! com
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I'm afraid that might need the attention of some of our HW engineers and I'd have to \
play telephone, passing questions back and forth. That just gets frustrating.

The official support model is to use IPS & HSD.

Plus, if it's a custom design we have NDAs in place and I don't want to get into all \
that.

Todd Fujinaka
Software Application Engineer
Data Center Group
Intel Corporation
todd.fujinaka@intel.com

-----Original Message-----
From: John H <5snkaz3rw7@snkmail.com> 
Sent: Thursday, June 18, 2020 4:20 PM
To: Fujinaka, Todd <todd.fujinaka@intel.com>; E1000-devel@lists.sourceforge.net; \
                Fujinaka, Todd <todd.fujinaka@intel.com>
Subject: RE: [E1000-devel] ixgbe for 10 GbE SFP+ without CS4227 phy

Thanks, Todd.  I already am in discussions with the factory rep - which is half \
Portwell (COM Express board) and half us (carrier board with SFP+).  I can certainly \
provide our side of the design (COM Express connector to SFP+).

But the main question I had for this list I think (I hope) can be answered without \
any of that...

Can the ixgbe driver work without a PHY (e.g., CS4227) between the X552 and SFP+?

Knowing the answer to that would help the ongoing troubleshooting.

It seems like the CS4227 is just a line buffer with some features, and a design with \
short traces could work without it.  But I don't know if there is something it does \
electrically that is required or if the ixgbe driver is currently written such that \
it won't work without the PHY.

Fujinaka, Todd wrote at 16:51 +0000 on Jun 18, 2020:
 > Sorry, not enough coffee. Beyond what we are going to be able to answer via email, \
mainly because of all the design details, etc.  >
 > Todd Fujinaka
 > Software Application Engineer
 > Data Center Group
 > Intel Corporation
 > todd.fujinaka@intel.com
 >
 > -----Original Message-----
 > From: Fujinaka, Todd <todd.fujinaka@intel.com>  > Sent: Thursday, June 18, 2020 \
9:38 AM  > To: John H <5snkaz3rw7@snkmail.com>; E1000-devel@lists.sourceforge.net  > \
Subject: Re: [E1000-devel] ixgbe for 10 GbE SFP+ without CS4227 phy  >  > Can you \
file a bug directly through your factory rep? I think this is beyond what we're going \
to answer via email.  >
 > Todd Fujinaka
 > Software Application Engineer
 > Data Center Group
 > Intel Corporation
 > todd.fujinaka@intel.com
 >
 > -----Original Message-----
 > From: John H <5snkaz3rw7@snkmail.com>  > Sent: Wednesday, June 17, 2020 2:39 PM  > \
To: E1000-devel@lists.sourceforge.net  > Subject: [E1000-devel] ixgbe for 10 GbE SFP+ \
without CS4227 phy  >  > Can the ixgbe driver be used without a CS4227 PHY between \
the NIC (X552 in this case) and the SFP+?  Do you have to configure anything (driver \
settings, EEPROM firmware) to support that?  >
 > I do see a CS4227 error message from the driver, but it's not clear if that is \
fatal:  >
 > Jun 17 21:36:26 localhost kernel: ixgbe 0000:04:00.0: eth10: CS4227 reset failed: \
-18 Jun 17 21:36:26 localhost kernel: ixgbe 0000:04:00.0: registered PHC device on \
eth10 Jun 17 21:36:26 localhost kernel: ADDRCONF(NETDEV_UP): eth10: link is not ready \
Jun 17 21:36:26 localhost kernel: ixgbe 0000:04:00.0: eth10: detected SFP+: 5  >  > \
However, I am not seeing link (NO-CARRIER).  >
 > Here is 'ethtool -m', so it's talking to the SFP+ okay.
 >
 > $ sudo ethtool -m eth10
 >         Identifier          : 0x03 (SFP)
 >         Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID)
 >         Connector           : 0x07 (LC)
 >         Transceiver codes   : 0x10 0x00 0x000x00 0x00 0x00 0x00 0x00
 >                             :  => 10G Ethernet: 10G Base-SR
 >         Encoding            : 0x06 (64B/66B)
 >         BR, Nominal         : 10300MBd
 >         Rate identifier     : 0x00 (unspecified)
 >         Length (SMF,km)     : 0km
 >         Length (SMF)        : 0m
 >         Length (50um)       : 80m
 >         Length (62.5um)     : 20m
 >         Length (Copper)     : 0m
 >         Length (OM3)        : 300m
 >         Laser wavelength    : 850nm
 >         Vendor name         : CISCO-INTEGRA   
 >         Vendor OUI          : c8:de:51
 >         Vendor PN           : SFP-10G-SR-S-IO 
 >         Vendor rev          : 01  



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