Function tap_nlattr_nested_start

dpdk/drivers/net/tap/tap_netlink.c:369–390

* Start a nested netlink attribute. * It must be followed later by a call to tap_nlattr_nested_finish(). * * @param[in, out] msg * The netlink message where to edit the nested_tails metadata. * @param[in] type * The nested attribute type to append. * * @return * -1 if adding a nested netlink attribute failed, 0 otherwise. */

 *   -1 if adding a nested netlink attribute failed, 0 otherwise.
 */
int
tap_nlattr_nested_start(struct nlmsg *msg, uint16_t type)
{
	struct nested_tail *tail;

	tail = rte_zmalloc(NULL, sizeof(struct nested_tail), 0);
	if (!tail) {
		TAP_LOG(ERR,
			"Couldn't allocate memory for nested netlink attribute");
		return -1;
	}

	tail->tail = (struct rtattr *)NLMSG_TAIL(&msg->nh);

	tap_nlattr_add(&msg->nh, type, 0, NULL);

	tail->prev = msg->nested_tails;

	msg->nested_tails = tail;

	return 0;
}

/**
 * End a nested netlink attribute.