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===== TCP Header Field Adjustments ===== TSO requires protocol header changes to the TCP header after CH/SP: * Sequence number: Sequence number of previous segment + segment size. * Flags ** FIN, PSH are only reflected in the last segment, zero in all others ** CWR is only reflected in the first segment, zero in all others ''IP Header Field Adjustments'' IP protocols require these changes: * IPv4 total length is updated to match the shorter payload * IPv6 payload length is updated to match the shorter payload * IPv4 packets must increment IP ID unless DF bit is set * IPv4 packet checksum is recomputed ''Extension Header Field Adjustments'' Headers between the IPv4 or IPv6 header and TCP header MUST be copied as pure CH/SP. Authenticated encryption has to happen after SO. IPSec ESP or PSP encryption headers must be copied in a pure CH/SP manner to each segment, for further processing by downstream inline encryption logic. <span id="udp-segmentation-offload"></span>
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