From: "Hu, Jiayu" <jiayu.hu@intel.com>
To: "jiangheng (G)" <jiangheng14@huawei.com>,
"users@dpdk.org" <users@dpdk.org>, "dev@dpdk.org" <dev@dpdk.org>
Subject: RE: [GRO] check whether ip_id continuity needs to be checked when two TCP packets are merged.
Date: Thu, 20 Apr 2023 02:30:41 +0000 [thread overview]
Message-ID: <CY5PR11MB648738B1D41B579EFA56555892639@CY5PR11MB6487.namprd11.prod.outlook.com> (raw)
In-Reply-To: <3bec4e84b0dc406887e9df08ddfd91ad@huawei.com>
Hi Cheng,
> -----Original Message-----
> From: jiangheng (G) <jiangheng14@huawei.com>
> Sent: Saturday, April 15, 2023 10:46 PM
> To: users@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; dev@dpdk.org
> Subject: [GRO] check whether ip_id continuity needs to be checked when
> two TCP packets are merged.
>
> Hi jiayu.hu
>
> It cannot be guaranteed that 16bit identification field of ip packets in the
> same tcp stream will be continuous.
> Please help check whether ip_id continuity needs to be checked when two
> TCP packets are merged?
> Seems to modify the following code, gro will aggregate better, and work
> better:
>
> diff --git a/lib/gro/gro_tcp4.h b/lib/gro/gro_tcp4.h index
> 212f97a042..06faead7b5 100644
> --- a/lib/gro/gro_tcp4.h
> +++ b/lib/gro/gro_tcp4.h
> @@ -291,12 +291,10 @@ check_seq_option(struct gro_tcp4_item *item,
> /* check if the two packets are neighbors */
> len = pkt_orig->pkt_len - l2_offset - pkt_orig->l2_len -
> pkt_orig->l3_len - tcp_hl_orig;
> - if ((sent_seq == item->sent_seq + len) && (is_atomic ||
> - (ip_id == item->ip_id + 1)))
> + if (sent_seq == item->sent_seq + len)
For atomic packets, the IP ID field is ignored, as it can be set in various ways.
For non-atomic packets, it follows Linux kernel tcp_gro_receive().
Is this change specific to your case? Can you give more details on why it helps?
Thanks,
Jiayu
> /* append the new packet */
> return 1;
> - else if ((sent_seq + tcp_dl == item->sent_seq) && (is_atomic ||
> - (ip_id + item->nb_merged == item->ip_id)))
> + else if (sent_seq + tcp_dl == item->sent_seq)
> /* pre-pend the new packet */
> return -1;
next prev parent reply other threads:[~2023-04-20 2:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-15 14:45 jiangheng (G)
2023-04-20 2:30 ` Hu, Jiayu [this message]
2023-04-20 2:45 ` Stephen Hemminger
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