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===== Interaction with TSO and USO ===== PISO can be combined with TSO and USO. Then piso_off points not to the start of the payload, but the start of the inner transport header, TCP or UDP. Then the protocol specific rules for the inner transport protocol must be respected. Any headers before piso_off must still be entirely ignored by the device and treated solely as CH/SP. The device cannot infer whether the offset points to a UDP or TCP header. Whether to apply pure PISO, PISO + TSO or PISO + USO will have to be communicated explicitly, e.g., with a field in a context descriptor. PISO + TSO/USO can optionally be supported on some legacy devices that were not built with PISO in mind. If a device supports TSO with variable length IPv4 options or IPv6 extension headers, with an explicit descriptor field that passes the length of these extra headers, then this can be used to pass arbitrary headers for CH/SP processing (instead of only options or extension headers), including tunnels. In this case the device expects the outer IP or IPv6 header to be an SO header with a large length field, so not prepared for pure CH/SP. A driver can patch up this distinction from the PISO interface. <span id="jumbogram-segmentation-offload"></span>
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