Change Details

The `if_hwassist` bits are from the `CSUM_` space, not from the `IFCAP_` space.

Transmit segment offloading depends on transmit checksum offloading. This also fixes a bug, since `if_hwassist` bits are from the `CSUM_` space, not from the `IFCAP_` space.

TheTransmit segment offloading depends on transmit checksum offloading. This also fixes a bug, since `if_hwassist` bits are from the `CSUM_` space, not from the `IFCAP_` space.