Re: [PATCH] net: hsr : Provide fix for HSRv1 supervisor frames decoding

[Lukasz Majewski]

Hi Sebastian,

> Hi Sebastian,
> 
> > On 2023-08-25 17:31:11 [+0200], Lukasz Majewski wrote:  
> > > Provide fix to decode correctly supervisory frames when HSRv1
> > > version of the HSR protocol is used.
> > > 
> > > Without this patch console is polluted with:
> > > ksz-switch spi1.0 lan1: hsr_addr_subst_dest: Unknown node
> > > 
> > > as a result of destination node's A MAC address equals to:
> > > 00:00:00:00:00:00.
> > > 
> > > cat /sys/kernel/debug/hsr/hsr0/node_table
> > > Node Table entries for (HSR) device
> > > MAC-Address-A,    MAC-Address-B,    time_in[A], time_in[B],
> > > Address-B 00:00:00:00:00:00 00:10:a1:94:77:30      400bf,
> > > 399c,	        0
> > > 
> > > It was caused by wrong frames decoding in the
> > > hsr_handle_sup_frame().
> > > 
> > > As the supervisor frame is encapsulated in HSRv1 frame:
> > > 
> > > SKB_I100000000: 01 15 4e 00 01 2d 00 10 a1 94 77 30 89 2f 00 34
> > > SKB_I100000010: 02 59 88 fb 00 01 84 15 17 06 00 10 a1 94 77 30
> > > SKB_I100000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > > SKB_I100000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > > SKB_I100000040: 00 00
> > > 
> > > The code had to be adjusted accordingly and the MAC-Address-A now
> > > has the proper address (the MAC-Address-B now has all 0's).    
> > 
> > Was this broken by commit
> > 	eafaa88b3eb7f ("net: hsr: Add support for redbox supervision
> > frames")
> >   
> 
> Yes, it seems so.
> 
> > ? Is this frame somehow special? I don't remember this…
> >   
> 
> Please refer to the whole thread - I've described this issue
> thoroughly (including hex dump of frames):
> https://lore.kernel.org/lkml/20230904175419.7bed196b@wsk/T/#m35cbfa4f1b8901d341fbc39659ace6a041f84c98
> 
> In short - the HSRv1 is not recognized correctly anymore:
> 
> HSR v0:
>     [Protocols in frame: eth:ethertype:hsr_prp_supervision]
>                                                                         
> HSR v1:
>     [Protocols in frame: eth:ethertype:hsr:hsr_prp_supervision]
> 

Have you had time to review this patch?

Your comments are more than welcome.

> 
> > > Signed-off-by: Lukasz Majewski <lukma@xxxxxxx>    
> > 
> > Sebastian  
> 
> 
> Best regards,
> 
> Lukasz Majewski
> 
> --
> 
> DENX Software Engineering GmbH,      Managing Director: Erika Unter
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email:
> lukma@xxxxxxx




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@xxxxxxx

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