Thank you very much Richardson for your valuable reply. But is there another way of doing it using the rte_pktmbuf_append / rte_pktmbuf_prepend ? Can you please tell me on how to do that ?
Regards On Fri, Mar 14, 2014 at 3:27 PM, Richardson, Bruce < bruce.richardson at intel.com> wrote: > > Hello friends, > > > > 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 > could > > 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. > > > > You probably want to do something like this to craft a full packet. First > allocate 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 > example, assuming mempool variable p: > > struct rte_mbuf *buf = rte_pktmbuf_alloc(p); > struct ether_hdr *ehdr = rte_pktmbuf_mtod(buf, struct ether_hdr *); > /* set ether_hdr fields here e.g. */ > ehdr->ether_type = rte_bswap16(ETHER_TYPE_IPv4); > struct ipv4_hdr *iphdr = (struct ipv4_hdr *)(&ehdr[1]); > /* set ipv4 header fields here */ > struct udp_hdr *uhdr = (struct udp_hdr *)(&iphdr[1]); > /* set udp header fields here, e.g. */ > uhdr->src_port = rte_bswap16(0x5000); >
