From: Ilya Matveychikov <matvejchikov@gmail.com>
To: dev@dpdk.org
Cc: jiayu.hu@intel.com
Subject: [dpdk-dev] A question about GRO neighbor packet matching
Date: Wed, 6 Dec 2017 18:02:21 +0400 [thread overview]
Message-ID: <4F9781B2-338C-4154-BDA1-BC24D1B2B689@gmail.com> (raw)
Hello all,
My question is about neighbor packet matching algorithm for TCP. Is it
correct to expect that IP packets should have continuous ID enumeration
(i.e. iph-next.id = iph-prev.id + 1)?
~~~
lib/librte_gro/gro_tcp4.c:check_seq_option()
...
/* check if the two packets are neighbors */
tcp_dl0 = pkt0->pkt_len - pkt0->l2_len - pkt0->l3_len - tcp_hl0;
if ((sent_seq == (item->sent_seq + tcp_dl0)) &&
(ip_id == (item->ip_id + 1)))
/* append the new packet */
return 1;
else if (((sent_seq + tcp_dl) == item->sent_seq) &&
((ip_id + item->nb_merged) == item->ip_id))
/* pre-pend the new packet */
return -1;
else
return 0;
~~~
As per RFC791:
Identification: 16 bits
An identifying value assigned by the sender to aid in assembling the
fragments of a datagram.
next reply other threads:[~2017-12-06 14:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-06 14:02 Ilya Matveychikov [this message]
2017-12-06 18:12 ` Stephen Hemminger
2017-12-06 18:38 ` Ilya Matveychikov
2017-12-06 23:15 ` Stephen Hemminger
2017-12-07 0:19 ` Ananyev, Konstantin
2017-12-07 1:01 ` Stephen Hemminger
2017-12-07 7:04 ` Ilya Matveychikov
2017-12-07 8:31 ` Hu, Jiayu
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