Function rte_vlan_insert

dpdk/lib/net/rte_ether.h:376–409

* Insert VLAN tag into mbuf. * * Software version of VLAN unstripping * * @param m * The packet mbuf. * @return * - 0: On success * -EPERM: mbuf is shared overwriting would be unsafe * -ENOSPC: not enough headroom in mbuf */

 *   -ENOSPC: not enough headroom in mbuf
 */
static inline int rte_vlan_insert(struct rte_mbuf **m)
{
	struct rte_ether_hdr *oh, *nh;
	struct rte_vlan_hdr *vh;

	/* Can't insert header if mbuf is shared */
	if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
		return -EINVAL;

	/* Can't insert header if the first segment is too short */
	if (rte_pktmbuf_data_len(*m) < 2 * RTE_ETHER_ADDR_LEN)
		return -EINVAL;

	oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
	nh = (struct rte_ether_hdr *)(void *)
		rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
	if (nh == NULL)
		return -ENOSPC;

	memmove(nh, oh, 2 * RTE_ETHER_ADDR_LEN);
	nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN);

	vh = (struct rte_vlan_hdr *) (nh + 1);
	vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);

	(*m)->ol_flags &= ~(RTE_MBUF_F_RX_VLAN_STRIPPED | RTE_MBUF_F_TX_VLAN);

	if ((*m)->ol_flags & RTE_MBUF_F_TX_TUNNEL_MASK)
		(*m)->outer_l2_len += sizeof(struct rte_vlan_hdr);
	else
		(*m)->l2_len += sizeof(struct rte_vlan_hdr);

	return 0;
}

#ifdef __cplusplus
}