Function tap_ioctl

dpdk/drivers/net/tap/rte_eth_tap.c:777–826

}

static int
tap_ioctl(struct pmd_internals *pmd, unsigned long request,
	  struct ifreq *ifr, int set, enum ioctl_mode mode)
{
	short req_flags = ifr->ifr_flags;
	int remote = pmd->remote_if_index &&
		(mode == REMOTE_ONLY || mode == LOCAL_AND_REMOTE);

	if (!pmd->remote_if_index && mode == REMOTE_ONLY)
		return 0;
	/*
	 * If there is a remote netdevice, apply ioctl on it, then apply it on
	 * the tap netdevice.
	 */
apply:
	if (remote)
		strlcpy(ifr->ifr_name, pmd->remote_iface, IFNAMSIZ);
	else if (mode == LOCAL_ONLY || mode == LOCAL_AND_REMOTE)
		strlcpy(ifr->ifr_name, pmd->name, IFNAMSIZ);
	switch (request) {
	case SIOCSIFFLAGS:
		/* fetch current flags to leave other flags untouched */
		if (ioctl(pmd->ioctl_sock, SIOCGIFFLAGS, ifr) < 0)
			goto error;
		if (set)
			ifr->ifr_flags |= req_flags;
		else
			ifr->ifr_flags &= ~req_flags;
		break;
	case SIOCGIFFLAGS:
	case SIOCGIFHWADDR:
	case SIOCSIFHWADDR:
	case SIOCSIFMTU:
		break;
	default:
		TAP_LOG(WARNING, "%s: ioctl() called with wrong arg",
			pmd->name);
		return -EINVAL;
	}
	if (ioctl(pmd->ioctl_sock, request, ifr) < 0)
		goto error;
	if (remote-- && mode == LOCAL_AND_REMOTE)
		goto apply;
	return 0;

error:
	TAP_LOG(DEBUG, "%s(%s) failed: %s(%d)", ifr->ifr_name,
		tap_ioctl_req2str(request), strerror(errno), errno);
	return -errno;
}

static int
tap_link_set_down(struct rte_eth_dev *dev)