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===== Copy Headers and Split Payload ===== In an abstract model of segmentation offload, the device splits SO packet payload into segment sized chunks and copies the SO packet protocol headers to each segment. We refer to this basic mechanism as copy-headers-and-split-payload (CH/SP). The host communicates an unsigned integer segment size to the device along with the packet. This field must be large enough to cover the L3 MTU range: 16b is customary, but not strictly required to meet this goal. If segment size is not a divisor of total payload length, then the last packet in the segment chain will be shorter. The device MUST NOT attempt to compute or derive segment size, because establishing that is a complex process of path MTU and transport MSS discovery, more suitable to be implemented in software in the host protocol stack. CH/SP is a simplified model. For specific protocols, segmentation offload can have subtle exceptions in how protocol header fields must be updated after copy. This spec explicitly defines all cases that diverge from pure CH/SP. The ground truth is the software segmentation implementation in Linux v6.3. If the two disagree, that source code takes precedence. <span id="tcp-segmentation-offload"></span>
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