[lwip-devel] [task #6849] Test how checksum on copy could be integrated into the stack

[Bill Auerbach]

Follow-up Comment #16, task #6849 (project lwip):

>- tcp_seg has 2 more members (u16_t chksum and u8_t chksum_swapped),

IMO this belongs in the pbuf.  A tcp_seg has a pbuf, and it *must* be in the
pbuf to do checksum on rx.

If you ensure that one segment has one pbuf, you don't need the swapped
field.  This is not a bad compromise because the gain with hw checksumming is
in not touching the data, not in the combining of segments.  If the app is
sending a lot of small pieces of data, I suspect transmit performance is not a
big consideration.

For UDP it also works when defined in the pbuf. I've already implemented it
and am using it this way for transmit.

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