From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shailja Pandey <csz168117@iitd.ac.in>
Subject: How to update the sequence number in TCP packets using
	DPDK-pktgen?
Date: Mon, 9 Oct 2017 19:12:49 +0530
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Hi,

In the DPDK application, I am maintaining some state and due to that I=20
need to generate the packets with monotonically increasing sequence=20
numbers. As shown in the code below,

/tip->tcp.seq=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D htonl(DEFAULT=
_PKT_NUMBER);/

DPDK is putting some default number as a sequence number in the TCP=20
packet and not using as defined by TCP protocol. I tried various=20
workarounds but due to multi-threaded nature of the pktgen application,=20
I am facing some issues and unable to put sequence numbers in increasing=20
order. I tried thread_local and pthread_mutex_lock etc to generate=20
packets with increasing sequence number.

I am not very sure what am I missing, Please help me in this matter.

_Function:_

void
pktgen_tcp_hdr_ctor(pkt_seq_t *pkt, tcpip_t *tip, int type __rte_unused)
{
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 uint16_t tlen;

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Zero out the header space =
*/
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 memset((char *)tip, 0, sizeof=
(tcpip_t));

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Create the TCP header */
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->ip.src=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D htonl(pkt->ip_src_addr.addr.ipv4.s_add=
r);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->ip.dst=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D htonl(pkt->ip_dst_addr.addr.ipv4.s_add=
r);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tlen=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D pkt->=
pktSize -
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 (pkt->ether_hdr_size + sizeof(ipHdr_t));

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->ip.len=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D htons(tlen);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->ip.proto=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 =3D pkt->ipProto;

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.sport=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D htons(pkt->sport);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.dport=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D htons(pkt->dport);

*tip->tcp.seq=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D htonl(DEFAULT=
_PKT_NUMBER);*

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.ack=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 =3D htonl(DEFAULT_ACK_NUMBER);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.offset=C2=A0=C2=A0=C2=
=A0=C2=A0 =3D ((sizeof(tcpHdr_t) / sizeof(uint32_t)) <<=20
4);=C2=A0=C2=A0=C2=A0=C2=A0 /* Offset in words */
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.flags=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D=20
ACK_FLAG;=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 /* ACK */
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.window=C2=A0=C2=A0=C2=
=A0=C2=A0 =3D htons(DEFAULT_WND_SIZE);
 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.urgent=C2=A0=C2=A0=C2=
=A0=C2=A0 =3D 0;

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tlen=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =3D pkt->=
pktSize - pkt->ether_hdr_size;

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 tip->tcp.cksum=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D cksum(tip, tlen, 0);
}

--=20

Thanks,
Shailja