In the 3c59x.c, e1000, and other adapter drivers, ip_summed is what is being checked for value CHECKSUM_HW when sending a packet.
Yep; my mistake on that one.
Regardless, Ion and Manish picked up on what you were missed - the NETIF_F_SG bit. And if your hardware can do 64-bit DMA, you'll want to set NETIF_F_HIGHDMA too.
Jeff
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