CC lng-odp-dpdk mailing list.
On 26 January 2018 at 04:27, lin huang <mit...@outlook.com> wrote:
> Hi all,
> I checked the code of odp-dpdk. And I got a problem which confused me
> a lot.
> In the function packet_alloc(), odp tried to alloc a buffer which
> originated from the mbuf at the dpdk memory pool.
> After that, rte_pktmbuf_alloc() got a pointer which ponted to the
> beginning of mbuf structures.
> Then the code just changed the pointer to point to odp_packet_hdr_t type.
> Is there something wrong?? Or rte_mempool_create() has done some magic
> work before alloc the mbuf??
> rte_mbuf: +==============+============================================
> ===========================+============+=======================+
> | rte_mbuf | RTE_PKTMBUF_HEADROOM
> | pkt data | RTE_PKTMBUF_TRAILROOM |
> +==============+============================================
> ===========================+============+=======================+
> mbuf = rte_pktmbuf_alloc(pool->s.rte_mempool);
> if (mbuf == NULL) {
> rte_errno = ENOMEM;
> return ODP_PACKET_INVALID;
> }
> pkt_hdr = (odp_packet_hdr_t *)mbuf;
> pkt_hdr->buf_hdr.totsize = mbuf->buf_len;
>
