[ipxe-devel] [Patch] Add fcoestat command

Michael Brown mbrown at fensystems.co.uk
Wed Jun 27 21:14:24 UTC 2012

On Wednesday 27 Jun 2012 19:53:30 Clark, Steven wrote:
> The problem I'm chasing right now is that I get fcoe ports but no fc ports.
> Since they are not 1:1 I found it helpful to dump some status.

OK.  It sounds as though you're having problems with FIP.  Useful things to 
try would be to build with DEBUG=fcoe and (if possible) to try capturing the 
traffic.  Capturing traffic might be difficult given that FCoE tends to use VLANs.

iPXE will use FIP VLAN discovery to detect an FCoE VLAN.  You can see if any 
VLAN devices have been created via "ifstat".  Once a VLAN has been discovered 
(or VLAN discovery has timed out), iPXE will use FIP to detect an FCF.  The FC 
device (visible via "fcstat") will be created only once a FCF has been 
detected (or FCF detection has timed out).

Common problems with iPXE FCoE are:

a) NIC drivers that don't strip the Ethernet CRC from the received packet: 
this doesn't affect TCP or UDP but will break FCoE

b) NIC drivers that don't enable promiscuous mode


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