nFAPI/VNF: Correctly set message length when segmenting
The 5G nFAPI message length is 32bits. In particular tx_data.requests can be longer than 64kB. When segmenting, we should correctly write the message of the current segment (across all 32bits), because the length would interpreted wrongly otherwise. This fixes a bug in which tx_data.requests were discarded for 4-layer DL MIMO on 100 MHz with this message: P7 unpack message length is greater than the message buffer Further, increase the type of various (segment-related) variables to 32 bits. Currently, the maximum segment size is sxt to 65000 bytes (and in will likely remain, because the maximum UDP size is 65536); nevertheless, increase it in case we will ever go beyond this. See also commit dee68e63 ("nFAPI: increase maximum segment size to 65000")
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