Hi,
In the DPDK application, I am maintaining some state and due to that I
need to generate the packets with monotonically increasing sequence
numbers. As shown in the code below,
/tip->tcp.seq = htonl(DEFAULT_PKT_NUMBER);/
DPDK is putting some default number as a sequence number in the TCP
packet 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 issues and unable to put sequence numbers in increasing
order. I tried thread_local and pthread_mutex_lock etc to generate
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)
{
uint16_t tlen;
/* Zero out the header space */
memset((char *)tip, 0, sizeof(tcpip_t));
/* Create the TCP header */
tip->ip.src = htonl(pkt->ip_src_addr.addr.ipv4.s_addr);
tip->ip.dst = htonl(pkt->ip_dst_addr.addr.ipv4.s_addr);
tlen = pkt->pktSize -
(pkt->ether_hdr_size + sizeof(ipHdr_t));
tip->ip.len = htons(tlen);
tip->ip.proto = pkt->ipProto;
tip->tcp.sport = htons(pkt->sport);
tip->tcp.dport = htons(pkt->dport);
*tip->tcp.seq = htonl(DEFAULT_PKT_NUMBER);*
tip->tcp.ack = htonl(DEFAULT_ACK_NUMBER);
tip->tcp.offset = ((sizeof(tcpHdr_t) / sizeof(uint32_t)) <<
4); /* Offset in words */
tip->tcp.flags =
ACK_FLAG; /* ACK */
tip->tcp.window = htons(DEFAULT_WND_SIZE);
tip->tcp.urgent = 0;
tlen = pkt->pktSize - pkt->ether_hdr_size;
tip->tcp.cksum = cksum(tip, tlen, 0);
}
--
Thanks,
Shailja
