[ofa-general] [PATCHv2] IB/ipoib: S/G and HW checksum support

[Or Gerlitz]

On 9/5/07, Jason Gunthorpe <jgunthorpe at obsidianresearch.com> wrote:

> Judging by the other comments in this thread, it still seems to me
> this would be best as RC only, notionally with the idea that RC is
> only used between hosts and not between gateways and hosts
> (administratively configured). That way the end-to-end nature of the
> checksum is retained. Gateways that want to support RC can negotiate
> this feature off.

Jason,

I guess by "RC" you mean connected mode. The connected mode is now
implemented over RC but as was discussed over this list few times, it
should (and it would) move to use UC, which is also much easier to
implement in hw based gateways. Anyway, your idea to allow this
feature coming into play only under negotiation schem sounds fine to
me, however:

> You may also want to look at using the new TSO/GSO/LRO stuff in a RC
> context. If you could send an entire GSO in one go and receive it as a
> LRO that might be a big improvement too.

>From Michael's and Eli's responses over the stateless offload related
thread, I understood that these optimizations are supported only for
UD QPs, which makes them irrelevant for the  connected mode.

Or.