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From: "Wang, Haiyue" <haiyue.wang@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, "pvalerio@redhat.com" <pvalerio@redhat.com>,
	"Aaron Conole" <aconole@redhat.com>,
	"Zhang, Qi Z" <qi.z.zhang@intel.com>,
	"Rong, Leyi" <leyi.rong@intel.com>,
	"Tu, Lijuan" <lijuan.tu@intel.com>, dpdk stable <stable@dpdk.org>,
	"Guo, Jia" <jia.guo@intel.com>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	"Ruifeng Wang (Arm Technology China)" <ruifeng.wang@arm.com>
Subject: Re: [dpdk-dev] [PATCH v1] net/ixgbe: adjust error for UDP with zero checksum
Date: Tue, 2 Feb 2021 12:54:48 +0000
Message-ID: <BN8PR11MB379529B42CF38C467091F2B1F7B59@BN8PR11MB3795.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAJFAV8zG0kOCZdFkmfYNVOR6ryLqetmA3dWZjA516o7acGMG2g@mail.gmail.com>

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Tuesday, February 2, 2021 17:45
> To: Wang, Haiyue <haiyue.wang@intel.com>
> Cc: dev <dev@dpdk.org>; pvalerio@redhat.com; Aaron Conole <aconole@redhat.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>; Rong, Leyi <leyi.rong@intel.com>; Tu, Lijuan <lijuan.tu@intel.com>; dpdk
> stable <stable@dpdk.org>; Guo, Jia <jia.guo@intel.com>; Richardson, Bruce <bruce.richardson@intel.com>;
> Ananyev, Konstantin <konstantin.ananyev@intel.com>; Jerin Jacob Kollanukkaran <jerinj@marvell.com>;
> Ruifeng Wang (Arm Technology China) <ruifeng.wang@arm.com>
> Subject: Re: [PATCH v1] net/ixgbe: adjust error for UDP with zero checksum
> 


> 
> If the driver/hw can't report a valid checksum hint, it should
> announce it does not know if the checksum is valid (neither bad, nor
> good).
> 
> So the workaround for udp packets (on this hw model) would be to
> report PKT_RX_L4_CKSUM_UNKNOWN.
> The sw application will then have to recompute the checksum itself if needed.
> 

Looks like this workaround will make OVS performance drop a lot, since
every UDP packet needs to do checksum by SW:

            bool  hwol_good_l4_csum = dp_packet_l4_checksum_valid(pkt)
                                      || dp_packet_hwol_tx_l4_checksum(pkt);
            /* Validate the checksum only when hwol is not supported. */
            if (extract_l4(&ctx->key, l4, dp_packet_l4_size(pkt),
                           &ctx->icmp_related, l3, !hwol_good_l4_csum,
                           NULL)) {
                ctx->hash = conn_key_hash(&ctx->key, ct->hash_basis);
                return true;
            }

The lesser of the two rights, marking as good seems a little better.

> 
> --
> David Marchand


  parent reply	other threads:[~2021-02-02 12:54 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-02  7:06 Haiyue Wang
2021-02-02  9:45 ` David Marchand
2021-02-02 12:42   ` Wang, Haiyue
2021-02-02 12:53     ` David Marchand
2021-02-02 12:56       ` Wang, Haiyue
2021-02-02 14:28         ` Wang, Haiyue
2021-02-02 17:42           ` Paolo Valerio
2021-02-02 12:54   ` Wang, Haiyue [this message]
2021-02-03  2:19 ` [dpdk-dev] [PATCH v2] net/ixgbe: fix UDP zero checksum error Haiyue Wang
2021-02-03  8:07   ` Zhang, Qi Z
2021-02-03  8:32     ` David Marchand
2021-02-04  7:45       ` Zhang, Qi Z
2021-02-04 14:39 ` [dpdk-dev] [PATCH v3] " Haiyue Wang
2021-02-05 17:50   ` Paolo Valerio
2021-02-07 18:40   ` Paolo Valerio
2021-02-08 13:48   ` Ananyev, Konstantin
2021-02-09  1:23     ` Zhang, Qi Z
2021-02-25 10:54   ` [dpdk-dev] [dpdk-stable] " David Marchand
2021-04-07 11:53     ` David Marchand
2021-04-08  1:12       ` Wang, Haiyue

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