Archipelago » qemu

void tap_fd_set_offload(int fd, int csum, int tso4,

                        int tso6, int ecn, int ufo)

{

    unsigned int offload = 0;

    if (csum) {

        offload |= TUN_F_CSUM;

        if (tso4)

            offload |= TUN_F_TSO4;

        if (tso6)

            offload |= TUN_F_TSO6;

        if ((tso4 || tso6) && ecn)

            offload |= TUN_F_TSO_ECN;

        if (ufo)

            offload |= TUN_F_UFO;

    }

    if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {

        offload &= ~TUN_F_UFO;

        if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {

            fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",

                    strerror(errno));

        }

    }

}