Re: [PATCH] fix PXE transmit failure if P_UNKNOWN is not supported

[Andrei Borzenkov]

В Sat, 26 Jul 2014 07:55:03 +0400
Andrey Borzenkov <address@hidden> пишет:

> В Fri, 25 Jul 2014 23:38:34 +0200
> Vladimir 'φ-coder/phcoder' Serbinenko <address@hidden> пишет:
> 
> > On 25.07.2014 17:53, Andrey Borzenkov wrote:
> > > Some PXE stacks do not support P_UNKNOWN in UNDI TRANSMIT; nothing is
> > > sent at all. So strip Ethernet header for known frame types and let PXE
> > > stack add it.
> > > 
> > If I'm reading this patch correctly it discards several fields of the
> > packet and i.a. kills vlan fields.
> 
> No, it does not. It discards Ethernet headers only when packet type is
> IP or ARP. VLAN packet will have different type and will be passed
> through as happens currently.
> 

Ping? It fixes real problem in the wild and this exact approach is used
by other PXE stacks, so it is not as it is completely untested.

If this is not acceptable - any idea how this problem can be fixed
short of maintaining explicit black lists?

> 
> >                                    Such low in the stack it should
> > replace the header only in the case of perfect match. It will be perfect
> > match in 99% of configs but we shouldn0t break configs on unaffected
> > machines.

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