Re: [ECOS] How to use IP/UDP/TCP checksum offload HW?

[Laurie Gellatly <laurie.gellatly@netic.com>]

Hi Grant,
I tried to enable this before without success. I agree that its a waste of processor time when it can be performed in hardware. Must we look at the latest BSD code to see how to implement this?

        ...Laurie:{)


On 07/06/2011, at 5:34 AM, Grant Edwards <grant.b.edwards@gmail.com> wrote:

> How do you tell the eCos network API that IP/TCP/UDP checksumming is
> handled by hardware?  I've found the if_data.ifi_hwassist field, but
> I'm not positive it really does what I want, and it only seems to
> affect the tx side of the stack.
> 
> Does if_data.ifi_hwassist tell ip_output.c to skil checkums in tx
> packets and let the hardware do it?
> 
> How do you tell the rx side of the stack that it doesn't need to check
> IP, UDP, and TCP checksums (the hardware will discard any packets with
> invalid checksums).
> 
> It seems a shame to not support for HW checksum offloading when it's
> gotten to the point where even a $4 uController has IP checksum
> offloading HW.
> 
> -- 
> Grant Edwards               grant.b.edwards        Yow! Eisenhower!!  Your
>                                  at               mimeograph machine upsets
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> 
> 
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