From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Matan Azrad <matan@mellanox.com>,
"Yigit, Ferruh" <ferruh.yigit@intel.com>,
Dekel Peled <dekelp@mellanox.com>,
"Mcnamara, John" <john.mcnamara@intel.com>,
"Kovacevic, Marko" <marko.kovacevic@intel.com>,
"nhorman@tuxdriver.com" <nhorman@tuxdriver.com>,
"ajit.khaparde@broadcom.com" <ajit.khaparde@broadcom.com>,
"somnath.kotur@broadcom.com" <somnath.kotur@broadcom.com>,
"Burakov, Anatoly" <anatoly.burakov@intel.com>,
"xuanziyang2@huawei.com" <xuanziyang2@huawei.com>,
"cloud.wangxiaoyun@huawei.com" <cloud.wangxiaoyun@huawei.com>,
"zhouguoyang@huawei.com" <zhouguoyang@huawei.com>,
"Lu, Wenzhuo" <wenzhuo.lu@intel.com>,
Shahaf Shuler <shahafs@mellanox.com>,
Slava Ovsiienko <viacheslavo@mellanox.com>,
"rmody@marvell.com" <rmody@marvell.com>,
"shshaikh@marvell.com" <shshaikh@marvell.com>,
"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
"Bie, Tiwei" <tiwei.bie@intel.com>,
"Wang, Zhihong" <zhihong.wang@intel.com>,
"yongwang@vmware.com" <yongwang@vmware.com>,
Thomas Monjalon <thomas@monjalon.net>,
"arybchenko@solarflare.com" <arybchenko@solarflare.com>,
"Wu, Jingjing" <jingjing.wu@intel.com>,
"Iremonger, Bernard" <bernard.iremonger@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v4 1/3] ethdev: support API to set max LRO packet size
Date: Fri, 8 Nov 2019 13:11:18 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB97725801A8C83047@IRSMSX104.ger.corp.intel.com> (raw)
In-Reply-To: <AM0PR0502MB40197D18E5F48633075AADBBD27B0@AM0PR0502MB4019.eurprd05.prod.outlook.com>
> -----Original Message-----
> From: Matan Azrad <matan@mellanox.com>
> Sent: Friday, November 8, 2019 11:56 AM
> To: Yigit, Ferruh <ferruh.yigit@intel.com>; Dekel Peled <dekelp@mellanox.com>; Mcnamara, John <john.mcnamara@intel.com>;
> Kovacevic, Marko <marko.kovacevic@intel.com>; nhorman@tuxdriver.com; ajit.khaparde@broadcom.com;
> somnath.kotur@broadcom.com; Burakov, Anatoly <anatoly.burakov@intel.com>; xuanziyang2@huawei.com;
> cloud.wangxiaoyun@huawei.com; zhouguoyang@huawei.com; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; Shahaf Shuler <shahafs@mellanox.com>; Slava Ovsiienko <viacheslavo@mellanox.com>;
> rmody@marvell.com; shshaikh@marvell.com; maxime.coquelin@redhat.com; Bie, Tiwei <tiwei.bie@intel.com>; Wang, Zhihong
> <zhihong.wang@intel.com>; yongwang@vmware.com; Thomas Monjalon <thomas@monjalon.net>; arybchenko@solarflare.com; Wu,
> Jingjing <jingjing.wu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>
> Cc: dev@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH v4 1/3] ethdev: support API to set max LRO packet size
>
>
>
> From: Ferruh Yigit
> > On 11/8/2019 10:10 AM, Matan Azrad wrote:
> > >
> > >
> > > From: Ferruh Yigit
> > >> On 11/8/2019 6:54 AM, Matan Azrad wrote:
> > >>> Hi
> > >>>
> > >>> From: Ferruh Yigit
> > >>>> On 11/7/2019 12:35 PM, Dekel Peled wrote:
> > >>>>> @@ -1266,6 +1286,18 @@ struct rte_eth_dev *
> > >>>>>
> > >>>> RTE_ETHER_MAX_LEN;
> > >>>>> }
> > >>>>>
> > >>>>> + /*
> > >>>>> + * If LRO is enabled, check that the maximum aggregated
> > packet
> > >>>>> + * size is supported by the configured device.
> > >>>>> + */
> > >>>>> + if (dev_conf->rxmode.offloads &
> > DEV_RX_OFFLOAD_TCP_LRO) {
> > >>>>> + ret = check_lro_pkt_size(
> > >>>>> + port_id, dev_conf-
> > >>>>> rxmode.max_lro_pkt_size,
> > >>>>> + dev_info.max_lro_pkt_size);
> > >>>>> + if (ret != 0)
> > >>>>> + goto rollback;
> > >>>>> + }
> > >>>>> +
> > >>>>
> > >>>> This check forces applications that enable LRO to provide
> > >> 'max_lro_pkt_size'
> > >>>> config value.
> > >>>
> > >>> Yes.(we can break an API, we noticed it)
> > >>
> > >> I am not talking about API/ABI breakage, that part is OK.
> > >> With this check, if the application requested LRO offload but not
> > >> provided 'max_lro_pkt_size' value, device configuration will fail.
> > >>
> > > Yes
> > >> Can there be a case application is good with whatever the PMD can
> > >> support as max?
> > > Yes can be - you know, we can do everything we want but it is better to be
> > consistent:
> > > Due to the fact of Max rx pkt len field is mandatory for JUMBO offload, max
> > lro pkt len should be mandatory for LRO offload.
> > >
> > > So your question is actually why both, non-lro packets and LRO packets max
> > size are mandatory...
> > >
> > >
> > > I think it should be important values for net applications management.
> > > Also good for mbuf size managements.
> > >
> > >>>
> > >>>> - Why it is mandatory now, how it was working before if it is
> > >>>> mandatory value?
> > >>>
> > >>> It is the same as max_rx_pkt_len which is mandatory for jumbo frame
> > >> offload.
> > >>> So now, when the user configures a LRO offload he must to set max
> > >>> lro pkt
> > >> len.
> > >>> We don't want to confuse the user here with the max rx pkt len
> > >> configurations and behaviors, they should be with same logic.
> > >>>
> > >>> This parameter defines well the LRO behavior.
> > >>> Before this, each PMD took its own interpretation to what should be
> > >>> the
> > >> maximum size for LRO aggregated packets.
> > >>> Now, the user must say what is his intension, and the ethdev can
> > >>> limit it
> > >> according to the device capability.
> > >>> By this way, also, the PMD can organize\optimize its data-path more.
> > >>> Also, the application can create different mempools for LRO queues
> > >>> to
> > >> allow bigger packet receiving for LRO traffic.
> > >>>
> > >>>> - What happens if PMD doesn't provide 'max_lro_pkt_size', so it is '0'?
> > >>> Yes, you can see the feature description Dekel added.
> > >>> This patch also updates all the PMDs support an LRO for non-0 value.
> > >>
> > >> Of course I can see the updates Matan, my point is "What happens if
> > >> PMD doesn't provide 'max_lro_pkt_size'",
> > >> 1) There is no check for it right, so it is acceptable?
> > >
> > > There is check.
> > > If the capability is 0, any non-zero configuration will fail.
> > >
> > >> 2) Are we making this filed mandatory to provide for PMDs, it is easy
> > >> to make new fields mandatory for PMDs but is this really necessary?
> > >
> > > Yes, for consistence.
> > >
> > >>>
> > >>> as same as max rx pkt len, no?
> > >>>
> > >>>> - What do you think setting 'max_lro_pkt_size' config value to what
> > >>>> PMD provided if application doesn't provide it?
> > >>> Same answers as above.
> > >>>
> > >>
> > >> If application doesn't care the value, as it has been till now, and
> > >> not provided explicit 'max_lro_pkt_size', why not ethdev level use
> > >> the value provided by PMD instead of failing?
> > >
> > > Again, same question we can ask on max rx pkt len.
> > >
> > > Looks like the packet size is very important value which should be set by
> > the application.
> > >
> > > Previous applications have no option to configure it, so they haven't
> > configure it, (probably cover it somehow) I think it is our miss to supply this
> > info.
> > >
> > > Let's do it in same way as we do max rx pkt len (as this patch main idea).
> > > Later, we can change both to other meaning.
> > >
> >
> > I think it is not a good reason to introduce a new mandatory config option for
> > application because of 'max_rx_pkt_len' does it.
>
> It is mandatory only if LRO offload is configured.
So max_rx_pkt_len will remain max size of one packet,
while max_lro_len will be max accumulate size for each LRO session?
BTW, I think that for ixgbe max lro is RTE_IPV4_MAX_PKT_LEN.
ixgbe_vf, as I remember, doesn’t support LRO at all.
>
> > Will it work, if:
> > - If application doesn't provide this value, use the PMD max
>
> May cause a problem if the mbuf size is not enough for the PMD maximum.
Another question, what will happen if PMD will ignore that value and will
generate packets bigger then requested?
>
> > - If both application and PMD doesn't provide this value, fail on configure()?
>
> It will work.
> In my opinion - not ideal.
>
> Matan
>
next prev parent reply other threads:[~2019-11-08 13:11 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-05 8:40 [dpdk-dev] [PATCH 0/3] " Dekel Peled
2019-11-05 8:40 ` [dpdk-dev] [PATCH 1/3] ethdev: " Dekel Peled
2019-11-05 12:39 ` Andrew Rybchenko
2019-11-05 13:09 ` Thomas Monjalon
2019-11-05 14:18 ` Dekel Peled
2019-11-05 14:27 ` Andrew Rybchenko
2019-11-05 14:51 ` Dekel Peled
2019-11-05 8:40 ` [dpdk-dev] [PATCH 2/3] net/mlx5: use " Dekel Peled
2019-11-05 8:40 ` [dpdk-dev] [PATCH 3/3] app/testpmd: " Dekel Peled
2019-11-05 9:35 ` [dpdk-dev] [PATCH 0/3] support " Matan Azrad
2019-11-06 11:34 ` [dpdk-dev] [PATCH v2 " Dekel Peled
2019-11-06 11:34 ` [dpdk-dev] [PATCH v2 1/3] ethdev: " Dekel Peled
2019-11-06 12:26 ` Thomas Monjalon
2019-11-06 12:39 ` Dekel Peled
2019-11-06 11:34 ` [dpdk-dev] [PATCH v2 2/3] net/mlx5: use " Dekel Peled
2019-11-06 11:34 ` [dpdk-dev] [PATCH v2 3/3] app/testpmd: " Dekel Peled
2019-11-06 12:35 ` Iremonger, Bernard
2019-11-06 13:14 ` Dekel Peled
2019-11-06 14:28 ` [dpdk-dev] [PATCH v3 0/3] support " Dekel Peled
2019-11-06 14:28 ` [dpdk-dev] [PATCH v3 1/3] ethdev: " Dekel Peled
2019-11-07 11:57 ` [dpdk-dev] [EXT] " Shahed Shaikh
2019-11-07 12:18 ` Dekel Peled
2019-11-06 14:28 ` [dpdk-dev] [PATCH v3 2/3] net/mlx5: use " Dekel Peled
2019-11-06 14:28 ` [dpdk-dev] [PATCH v3 3/3] app/testpmd: " Dekel Peled
2019-11-06 16:41 ` [dpdk-dev] [PATCH v3 0/3] support " Iremonger, Bernard
2019-11-07 6:10 ` Dekel Peled
2019-11-07 12:35 ` [dpdk-dev] [PATCH v4 " Dekel Peled
2019-11-07 12:35 ` [dpdk-dev] [PATCH v4 1/3] ethdev: " Dekel Peled
2019-11-07 20:15 ` Ferruh Yigit
2019-11-08 6:54 ` Matan Azrad
2019-11-08 9:19 ` Ferruh Yigit
2019-11-08 10:10 ` Matan Azrad
2019-11-08 11:37 ` Ferruh Yigit
2019-11-08 11:56 ` Matan Azrad
2019-11-08 12:51 ` Ferruh Yigit
2019-11-08 16:11 ` Dekel Peled
2019-11-08 16:53 ` Ferruh Yigit
2019-11-09 18:20 ` Matan Azrad
2019-11-10 23:40 ` Ananyev, Konstantin
2019-11-11 8:01 ` Matan Azrad
2019-11-12 18:31 ` Ananyev, Konstantin
2019-11-11 11:15 ` Ferruh Yigit
2019-11-11 11:33 ` Matan Azrad
2019-11-11 12:21 ` Ferruh Yigit
2019-11-11 13:32 ` Matan Azrad
2019-11-08 13:11 ` Ananyev, Konstantin [this message]
2019-11-08 14:10 ` Dekel Peled
2019-11-08 14:52 ` Ananyev, Konstantin
2019-11-08 16:08 ` Dekel Peled
2019-11-08 16:28 ` Ananyev, Konstantin
2019-11-09 18:26 ` Matan Azrad
2019-11-10 22:51 ` Ananyev, Konstantin
2019-11-11 6:53 ` Matan Azrad
2019-11-07 12:35 ` [dpdk-dev] [PATCH v4 2/3] net/mlx5: use " Dekel Peled
2019-11-08 9:12 ` Slava Ovsiienko
2019-11-08 9:23 ` Ferruh Yigit
2019-11-07 12:35 ` [dpdk-dev] [PATCH v4 3/3] app/testpmd: " Dekel Peled
2019-11-07 14:20 ` Iremonger, Bernard
2019-11-07 20:25 ` Ferruh Yigit
2019-11-08 6:56 ` Matan Azrad
2019-11-08 13:58 ` Dekel Peled
2019-11-08 6:28 ` [dpdk-dev] [PATCH v4 0/3] support " Matan Azrad
2019-11-08 16:42 ` [dpdk-dev] [PATCH v5 " Dekel Peled
2019-11-08 16:42 ` [dpdk-dev] [PATCH v5 1/3] ethdev: " Dekel Peled
2019-11-10 23:07 ` Ananyev, Konstantin
2019-11-11 7:40 ` Dekel Peled
2019-11-08 16:42 ` [dpdk-dev] [PATCH v5 2/3] net/mlx5: use " Dekel Peled
2019-11-08 16:42 ` [dpdk-dev] [PATCH v5 3/3] app/testpmd: " Dekel Peled
2019-11-10 23:11 ` Ananyev, Konstantin
2019-11-11 7:40 ` Dekel Peled
2019-11-08 23:07 ` [dpdk-dev] [PATCH v6] ethdev: add " Thomas Monjalon
2019-11-10 22:47 ` Ananyev, Konstantin
2019-11-11 17:47 ` [dpdk-dev] [PATCH v7 0/3] support API to set " Dekel Peled
2019-11-11 17:47 ` [dpdk-dev] [PATCH v7 1/3] ethdev: " Dekel Peled
2019-11-12 0:46 ` Ferruh Yigit
2019-11-11 17:47 ` [dpdk-dev] [PATCH v7 2/3] net/mlx5: use " Dekel Peled
2019-11-11 17:47 ` [dpdk-dev] [PATCH v7 3/3] app/testpmd: " Dekel Peled
2019-11-12 0:46 ` Ferruh Yigit
2019-11-12 0:47 ` [dpdk-dev] [PATCH v7 0/3] support " Ferruh Yigit
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