Thanks, Jason,
This looks like a patch to the ten_gb_eth_v2_00_a pcore. It might apply
reasonably well to the ten_gb_eth_v3_00_a pcore that is in the current ROACH
and ROACH2 base systems. Can that pcore be used on both ROACH and ROACH2? My
10 GbE ROACH2 designs use the kat_ten_gb_eth_v1_00_a pcore. Presumably a
similar modification could be made there as well.
Dave
On Oct 1, 2013, at 11:15 PM, Jason Manley wrote:
>> WRT multicast TX, this was indeed implemented on the BEE2 (I recall playing
>> with this some years ago) by Jouko in 2009. Emails predate archive, from 05
>> Feb 2009. I'm not sure what happened to this patch, but it's simple enough
>> to re-add.
>
> Just dug up the email. Correction and apologies, this was added by Jan
> Wagner!
>
>
> Begin forwarded message:
>
>> From: Jan Wagner <jwag...@kurp.hut.fi>
>> Date: 05 February 2009 13:49:28 SAST
>> To: casper@lists.berkeley.edu
>> Subject: [casper] patch: tengbe pcore multicast support
>>
>> Hi,
>>
>> I added UDP multicast sending support to the 10G IP core.
>>
>> Now all 224.0.0.0 through 239.255.255.255 are sent correctly with the
>> corresponding multicast MAC.
>>
>> Earlier these UDP packets would have incorrectly been routed through the
>> gateway MAC (and e.g. our HP6400cl and Summit X450 did not detect and
>> convert the header multicast-IP target MAC from the wrong into the correct
>> multicast MAC upon switching the packet to another 10G port).
>>
>> The "patch" is attached. It is a diff to "some" version of the 10G core, not
>> the SVN, but the patch is rather short and you can apply it manually if it
>> doesn't work directly.
>>
>> Maybe you can commit the changes to the ibob/roach SVN?
>>
>> By the way, there is one remaining TODO: I added provisions for TTL
>> ('tx_ip_ttl'). Default TTL is 0xFF, but for multicast 0x01 is preferrable.
>> The magic value X"8412" in the tx_ip_checksum_fixed_0 sum needs to be
>> changed to include 'tx_ip_ttl'. I couldn't make sense of the X"8412" so the
>> 0x01 TTL is not supported by the patch yet. Maybe somebody can figure out
>> the computation?
>>
>> - Jan
>>
>> --
>> ****************************************************
>> Helsinki University of Technology
>> Dept. of Metsähovi Radio Observatory
>> http://www.metsahovi.fi/~jwagner/
>> Work +358-9-428320-36
> <patch.txt>
