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From: "Richardson, Bruce" <bruce.richardson@intel.com>
To: sabu kurian <sabu2kurian@gmail.com>, "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: [dpdk-dev] Packet crafting....
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Date: Fri, 14 Mar 2014 09:57:09 +0000
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Subject: Re: [dpdk-dev] Packet crafting....
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> Hello friends,
>=20
> As of now... I know on how to create an ipv4 header using the 'struct
> ipv4_hdr'.
> My requirement is to craft a packet and sent it via 'rte_eth_tx_burst'.
> I know that there should be an 'ether_hdr' created before, the packet cou=
ld
> be sent.
> Could someone help me on how to set the address fields and type in
> 'ether_hdr' and how to put the ipv4 header as the payload for ether_hdr.
>=20

You probably want to do something like this to craft a full packet. First a=
llocate an mbuf, then get it's data pointer as a ether_hdr structure, then =
an ip_hdr beyond that and then any L4 headers, e.g. udp, beyond that. For e=
xample, assuming mempool variable p:

    struct rte_mbuf *buf =3D rte_pktmbuf_alloc(p);
    struct ether_hdr *ehdr =3D rte_pktmbuf_mtod(buf, struct ether_hdr *);
/* set ether_hdr fields here e.g. */
    ehdr->ether_type =3D rte_bswap16(ETHER_TYPE_IPv4);
    struct ipv4_hdr *iphdr =3D (struct ipv4_hdr *)(&ehdr[1]);
/* set ipv4 header fields here */
    struct udp_hdr *uhdr =3D (struct udp_hdr *)(&iphdr[1]);
/* set udp header fields here, e.g. */
    uhdr->src_port =3D rte_bswap16(0x5000);