IFCAP_RXCSUM_IPV6
caps |= IFCAP_RXCSUM_IPV6;
if (ifp->if_capenable & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6))
ifp->if_capabilities |= IFCAP_RXCSUM_IPV6 | IFCAP_TXCSUM_IPV6;
if (mask & (IFCAP_RXCSUM | IFCAP_RXCSUM_IPV6 | /* IFCAP_LRO | */
if (mask & IFCAP_RXCSUM_IPV6)
ifp->if_capenable ^= IFCAP_RXCSUM_IPV6;
#if !defined(IFCAP_RXCSUM_IPV6)