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[lwip-devel] [task #6849] Test how checksum on copy could be integrated
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From: |
Jonathan Larmour |
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Subject: |
[lwip-devel] [task #6849] Test how checksum on copy could be integrated into the stack |
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Date: |
Fri, 04 May 2007 10:59:21 +0000 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060513 Fedora/1.0.8-1.1.fc3.1.legacy Firefox/1.0.8 |
Follow-up Comment #2, task #6849 (project lwip):
Actually thinking about the TCP case a bit more, I guess a seg could store
some extra intermediate state to allow the checksum to be computed on an
ongoing basis as things are added - 32-bit accumulator, and whether there was
an odd byte yet to be added. tcp_output could then generate the checksum from
that.
Although it wouldn't be good if every pbuf had to have its size increased for
UDP, and every tcp_seg had to have its size increased for the intermediate
data.
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