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

[Bill Auerbach]

Follow-up Comment #29, task #6849 (project lwip):

I meant to reply but it got away from me.

I see the problem you describe.  If the checksum is set for the
pbuf->payload, don't call pbuf_header but create a new pbuf for the header and
chain to the checksummed pbuf.  It's more work, but the checksum savings far
offsets handling a chain.  Mine works this way - the pbuf head is the IP and
UDP header and I chain the UDP (pre-checksummed) pbuf to it.  It happened by
itself because the pbuf_header failed and the current code allocates and
appends when the pbuf_header fails.

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