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From: "Wiles, Keith" <keith.wiles@intel.com>
To: Shailja Pandey <csz168117@iitd.ac.in>
CC: "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: [dpdk-dev] How to update the sequence number in TCP packets
using DPDK-pktgen?
Thread-Index: AQHTQQSaTyal7/PnuECNKbdGHs9r9aLcNvWA
Date: Mon, 9 Oct 2017 17:12:45 +0000
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References: <c8dde074-7192-e7dd-b8b8-857f370e4649@iitd.ac.in>
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Subject: Re: [dpdk-dev] How to update the sequence number in TCP packets
using DPDK-pktgen?
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> On Oct 9, 2017, at 8:42 AM, Shailja Pandey <csz168117@iitd.ac.in> wrote:
>=20
> Hi,
>=20
> In the DPDK application, I am maintaining some state and due to that I ne=
ed to generate the packets with monotonically increasing sequence numbers. =
As shown in the code below,
>=20
> /tip->tcp.seq =3D htonl(DEFAULT_PKT_NUMBER);/
>=20
> DPDK is putting some default number as a sequence number in the TCP packe=
t and not using as defined by TCP protocol. I tried various workarounds but=
due to multi-threaded nature of the pktgen application, I am facing some i=
ssues and unable to put sequence numbers in increasing order. I tried threa=
d_local and pthread_mutex_lock etc to generate packets with increasing sequ=
ence number.
>=20
> I am not very sure what am I missing, Please help me in this matter.
The way pktgen was written was for performance, which means I setup the mbu=
fs at start time and do not touch them again till another start command. Th=
is causes packets to be sent out of order as I do not know when mbufs are r=
eturned to the free pool.
The only way to send a given sequence is to modified each packet as it is s=
ent, which will impact performance. The random mode does just this type of =
packet mods and it would be a good model to look at if you want to modify t=
he code.
>=20
> _Function:_
>=20
> void
> pktgen_tcp_hdr_ctor(pkt_seq_t *pkt, tcpip_t *tip, int type __rte_unused)
> {
> uint16_t tlen;
>=20
> /* Zero out the header space */
> memset((char *)tip, 0, sizeof(tcpip_t));
>=20
> /* Create the TCP header */
> tip->ip.src =3D htonl(pkt->ip_src_addr.addr.ipv4.s_addr);
> tip->ip.dst =3D htonl(pkt->ip_dst_addr.addr.ipv4.s_addr);
> tlen =3D pkt->pktSize -
> (pkt->ether_hdr_size + sizeof(ipHdr_t));
>=20
> tip->ip.len =3D htons(tlen);
> tip->ip.proto =3D pkt->ipProto;
>=20
> tip->tcp.sport =3D htons(pkt->sport);
> tip->tcp.dport =3D htons(pkt->dport);
>=20
> *tip->tcp.seq =3D htonl(DEFAULT_PKT_NUMBER);*
>=20
> tip->tcp.ack =3D htonl(DEFAULT_ACK_NUMBER);
> tip->tcp.offset =3D ((sizeof(tcpHdr_t) / sizeof(uint32_t)) <<=
4); /* Offset in words */
> tip->tcp.flags =3D ACK_FLAG; =
/* ACK */
> tip->tcp.window =3D htons(DEFAULT_WND_SIZE);
> tip->tcp.urgent =3D 0;
>=20
> tlen =3D pkt->pktSize - pkt->ether_hdr_size;
>=20
> tip->tcp.cksum =3D cksum(tip, tlen, 0);
> }
>=20
> --=20
>=20
> Thanks,
> Shailja
>=20
Regards,
Keith