Function pktmbuf_deep_clone

lib/ff_dpdk_if.c:1536–1572

copied from rte_pktmbuf_clone */

/* copied from rte_pktmbuf_clone */
static inline struct rte_mbuf *
pktmbuf_deep_clone(const struct rte_mbuf *md,
    struct rte_mempool *mp)
{
    struct rte_mbuf *mc, *mi, **prev;
    uint32_t pktlen;
    uint8_t nseg;

    if (unlikely ((mc = rte_pktmbuf_alloc(mp)) == NULL))
        return NULL;

    mi = mc;
    prev = &mi->next;
    pktlen = md->pkt_len;
    nseg = 0;

    do {
        nseg++;
        pktmbuf_deep_attach(mi, md);
        *prev = mi;
        prev = &mi->next;
    } while ((md = md->next) != NULL &&
        (mi = rte_pktmbuf_alloc(mp)) != NULL);

    *prev = NULL;
    mc->nb_segs = nseg;
    mc->pkt_len = pktlen;

    /* Allocation of new indirect segment failed */
    if (unlikely (mi == NULL)) {
        rte_pktmbuf_free(mc);
        return NULL;
    }

    __rte_mbuf_sanity_check(mc, 1);
    return mc;
}

static inline void
ff_add_vlan_tag(struct rte_mbuf * rtem)