[ofa-general] Bonding and hw_csum

[Tziporet Koren]

Or Gerlitz wrote:
> Koen Segers wrote:
>> I just saw some patches on the mailing list concerning csum offloading.
>> Are these applied in RC3? Or are they going to be introduced in the
>> daily build of tomorrow?
>> Is it correct to state that these patches replace the hw_csum parameter
>> by offloading the csum computation to the mthca? This would mean that
>> the results should be similar also.
>
> no and no, best if you take a look on the presentation @ 
> http://openfabrics.org/archives/nov2007sc/IPoIB-UD%20SO.pdf
>
> Basically the "checksum offloading" patches are for the datagram mode 
> and is the standard offload as in the Ethernet world, where the 
> "hw_csum" patch was for the connected mode.
>
>> Does the new offload patch depend on the type of hca being used?
>> According to lspci, we have the "InfiniBand: Mellanox Technologies
>> MT25208 InfiniHost III Ex (rev a0)" card. Do these patches work on a
>> sles 10 sp1 installed on x3755 and x3655 machines of IBM that have this
>> card inserted?
>
> checksum offloading is supported by the connectx and some of the other 
> Mellanox devices, I am quite sure that 25208 is one of them, but you 
> have to clarify this with Mellanox
>
>
ConnectX and MT25208 InfiniHost III Ex supports IPoIB "checksum offloading"

Tziporet