SAMA5D44 Receive and transmit IP, TCP and UDP checksum offload

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The datasheet SAMA5D44 states that the GMAC has the following feature:

Quote: Receive and transmit IP, TCP and UDP checksum offload. Both IPv4 and IPv6 packet types supported

Unfortunately it only explains how to enable the receive checksum offload (by setting bit 24 of the network configuration register) and does not explain how to enable the transmit checksum offload feature. The gmac.h file from the ASF contains the definition "GMAC_DCFGR_TXCOEN" with the comment "Transmitter Checksum Generation Offload Enable" but the datasheet shows that this bit has no function and trying to set this bit does not appear to enable the feature.

Does the feature not actually exist?