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Ethernet Tx Payload Checksum Offloading with IP Fragments

Question asked by Mark Butcher on Jan 11, 2016

Hi All

 

The user manuals to the Kinetis parts with Ethernet discuss the way that the checksum offloading function handles received IP fragments but doesn't mention details about how it handles tranmission fragments.

 

What I was expecting is that it would recognise that the payload is fragmented (due to either non-zero fragment offset or more fragments flag) and disable the operation for the present frame. However I am finding that it is necessary to disable the payload offloading operation o a frame basis when fragments are sent to avoid this being corrupted.

 

Is this expected operation/behavior?

 

Regards

 

Mark

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