[dpdk-dev] Crafting a packet for transmission.
medvedkinv at gmail.com
Thu Mar 13 13:51:48 CET 2014
Cast pointer to required struct pointer, for example for ipv4
struct ipv4_hdr *iph;
iph = (struct ipv4_hdr *)rte_pktmbuf_append(m, sizeof(struct ipv4_hdr));
and fill in fields.
Look in lib/librte_net/ directory.
2014-03-13 16:04 GMT+04:00 Aravind <altoarun at gmail.com>:
> Thank you for your reply Vladimir.
> I just went through the api reference for Intel DPDK. 'rte_pktmbuf_append'
> funcion append len bytes to an mbuf and return a pointer to the start
> address of the added data. But how am I suppose to fill in the packet
> headers...? It would be great if you could guide me on this.
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> On Thu, Mar 13, 2014 at 5:18 PM, Vladimir Medvedkin <medvedkinv at gmail.com>wrote:
>> At first look at https://github.com/Pktgen/Pktgen-DPDK
>> If you need your custom app:
>> - alloc mbuf with rte_pktmbuf_alloc
>> - fill up L2-4 headers fields (look at rte_pktmbuf_append func for
>> - send packet via rte_eth_tx_burst
>> 2014-03-13 15:15 GMT+04:00 sabu kurian <sabu2kurian at gmail.com>:
>> > Hai friends,
>> > My requirement is to create a packet generator. So I could use
>> > struct rte_mbuf * m;
>> > to create a single packet holder. So how am I suppose to fill in the
>> > details like the MAC source , destination and also the IP source ,
>> > destination (in case of IPv4 packets).
>> > Following the l2fwd example, which has got the TAP interface to write
>> > data to and read the data from.
>> > using the ether_hdr , one could read the MAC address from the packet
>> > eth = rte_pktmbuf_mtod(m, struct ether_hdr *);
>> > tmp = ð->s_addr.addr_bytes;
>> > But how am I suppose to craft a packet and supply in all these details
>> , so
>> > that I could sent the packet via rte_eth_tx_burst
>> > Thanks in advance
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