Re: [lwip-users] Hardware Assisted Checksum

[Christiaan Simons]

Jim wrote on 23-11-2005 20:50:36:

> I suspect that an lwIP implementation might rest on device
> capabilities described in netif, and flags describing buffer
> status/contents/needs in pbuf in a similar manner.

My opinion: it would nice to have a user supplied checksumming routine,
as a callback function, not an "lwipopt".

Listing this as a device capability looks nice,
but isn't a requirement to get it working or
it won't be of much use I guess.

I'm unsure where to locate this in the stack.
The netif can be used, but I dislike the idea
of extra pbuf status flags.

I can imagine one would use NIOS (to run lwip) or other FPGA based
processing
to speed up the checksum calculations. AFAIK Altera and Xilinx did some
lwip porting, maybe this would be a nice feature for them.

I agree the original idea coined by EVS looks rather crude,
and I doubt if it works.

Bye,

Christiaan Simons

Hardware / Software Engineer
Axon Digital Design

+31 (0)13 511 66 66
+31 (0)13 511 41 51

http://www.axon.tv



This email and any files transmitted with it are confidential and intended
solely for the use of the individual or entity to whom they are addressed.
If you have received this email in error please notify the system manager.
This message contains confidential information and is intended only for the
individual named.  If you are not the named addressee you should not
disseminate, distribute or copy this e-mail.