DPDK patches and discussions
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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	Thomas Monjalon <thomas@monjalon.net>,
	Jerin Jacob <jerinj@marvell.com>,
	Xiaoyun Li <xiaoyun.li@intel.com>, Chas Williams <chas3@att.com>,
	"Min Hu (Connor)" <humin29@huawei.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	Sachin Saxena <sachin.saxena@oss.nxp.com>,
	Qi Zhang <qi.z.zhang@intel.com>,
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	Viacheslav Ovsiienko <viacheslavo@nvidia.com>,
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	Maciej Czekaj <mczekaj@marvell.com>, Ray Kinsella <mdr@ashroe.eu>,
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	Jasvinder Singh <jasvinder.singh@intel.com>, <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v3 1/6] ethdev: fix max Rx packet length
Date: Tue, 5 Oct 2021 17:46:48 +0100	[thread overview]
Message-ID: <3094d047-fe1d-ee27-fa3c-dd0efce9be03@intel.com> (raw)
In-Reply-To: <20211001080755.21647298@hermes.local>

On 10/1/2021 4:07 PM, Stephen Hemminger wrote:
> On Fri,  1 Oct 2021 15:36:18 +0100
> Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> 
>> Other issues causing confusion is:
>> * maximum transmission unit (MTU) is payload of the Ethernet frame. And
>>    'max_rx_pkt_len' is the size of the Ethernet frame. Difference is
>>    Ethernet frame overhead, and this overhead may be different from
>>    device to device based on what device supports, like VLAN and QinQ.
>> * 'max_rx_pkt_len' is only valid when application requested jumbo frame,
>>    which adds additional confusion and some APIs and PMDs already
>>    discards this documented behavior.
>> * For the jumbo frame enabled case, 'max_rx_pkt_len' is an mandatory
>>    field, this adds configuration complexity for application.
> 
> One other issue which DPDK inherits from Linux and BSD is that
> MTU (Maximum Transmission Unit) is overloaded to mean MRU (Maximum Receive Unit).
> 
> On Linux, network devices are allowed to receive packets of any size they
> want. MTU is used as a hint about "you need to accept at least MTU size
> packets on receive". So MRU >= MTU.
> 
> In practice, and documentation, MRU and MTU are used synonymously.
> 

Yes MTU is used to refer both MTU & MRU, same config value (MTU) is used
to configure both.

I don't know if there is a need to configure them separately, if there is we
can address it in another patch.

  reply	other threads:[~2021-10-05 16:47 UTC|newest]

Thread overview: 112+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-09 17:29 [dpdk-dev] [PATCH 1/4] " Ferruh Yigit
2021-07-09 17:29 ` [dpdk-dev] [PATCH 2/4] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-07-13 13:48   ` Andrew Rybchenko
2021-07-21 12:26     ` Ferruh Yigit
2021-07-18  7:49   ` Xu, Rosen
2021-07-19 14:38   ` Ajit Khaparde
2021-07-09 17:29 ` [dpdk-dev] [PATCH 3/4] ethdev: move check to library for MTU set Ferruh Yigit
2021-07-13 13:56   ` Andrew Rybchenko
2021-07-18  7:52   ` Xu, Rosen
2021-07-09 17:29 ` [dpdk-dev] [PATCH 4/4] ethdev: remove jumbo offload flag Ferruh Yigit
2021-07-13 14:07   ` Andrew Rybchenko
2021-07-21 12:26     ` Ferruh Yigit
2021-07-21 12:39     ` Ferruh Yigit
2021-07-18  7:53   ` Xu, Rosen
2021-07-13 12:47 ` [dpdk-dev] [PATCH 1/4] ethdev: fix max Rx packet length Andrew Rybchenko
2021-07-21 16:46   ` Ferruh Yigit
2021-07-22  1:31     ` Ajit Khaparde
2021-07-22 10:27       ` Ferruh Yigit
2021-07-22 10:38         ` Andrew Rybchenko
2021-07-18  7:45 ` Xu, Rosen
2021-07-19  3:35 ` Huisong Li
2021-07-21 15:29   ` Ferruh Yigit
2021-07-22  7:21     ` Huisong Li
2021-07-22 10:12       ` Ferruh Yigit
2021-07-22 10:15         ` Andrew Rybchenko
2021-07-22 14:43           ` Stephen Hemminger
2021-09-17  1:08             ` Min Hu (Connor)
2021-09-17  8:04               ` Ferruh Yigit
2021-09-17  8:16                 ` Min Hu (Connor)
2021-09-17  8:17                 ` Min Hu (Connor)
2021-07-22 17:21 ` [dpdk-dev] [PATCH v2 1/6] " Ferruh Yigit
2021-07-22 17:21   ` [dpdk-dev] [PATCH v2 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-07-22 17:21   ` [dpdk-dev] [PATCH v2 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-07-22 17:21   ` [dpdk-dev] [PATCH v2 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
2021-07-22 17:21   ` [dpdk-dev] [PATCH v2 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-07-23  3:29     ` Huisong Li
2021-07-22 17:21   ` [dpdk-dev] [PATCH v2 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-01 14:36   ` [dpdk-dev] [PATCH v3 1/6] ethdev: fix max Rx packet length Ferruh Yigit
2021-10-01 14:36     ` [dpdk-dev] [PATCH v3 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-10-04  5:08       ` Somnath Kotur
2021-10-01 14:36     ` [dpdk-dev] [PATCH v3 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-10-04  5:09       ` Somnath Kotur
2021-10-01 14:36     ` [dpdk-dev] [PATCH v3 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
     [not found]       ` <CAOBf=muYkU2dwgi3iC8Q7pdSNTJsMUwWYdXj14KeN_=_mUGa0w@mail.gmail.com>
2021-10-04  7:55         ` Somnath Kotur
2021-10-05 16:48           ` Ferruh Yigit
2021-10-01 14:36     ` [dpdk-dev] [PATCH v3 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-10-01 14:36     ` [dpdk-dev] [PATCH v3 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-01 15:07     ` [dpdk-dev] [PATCH v3 1/6] ethdev: fix max Rx packet length Stephen Hemminger
2021-10-05 16:46       ` Ferruh Yigit [this message]
2021-10-05 17:16     ` [dpdk-dev] [PATCH v4 " Ferruh Yigit
2021-10-05 17:16       ` [dpdk-dev] [PATCH v4 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-10-08  8:39         ` Xu, Rosen
2021-10-05 17:16       ` [dpdk-dev] [PATCH v4 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-10-05 17:16       ` [dpdk-dev] [PATCH v4 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
2021-10-08  8:38         ` Xu, Rosen
2021-10-05 17:16       ` [dpdk-dev] [PATCH v4 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-10-05 17:16       ` [dpdk-dev] [PATCH v4 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-05 22:07       ` [dpdk-dev] [PATCH v4 1/6] ethdev: fix max Rx packet length Ajit Khaparde
2021-10-06  6:08         ` Somnath Kotur
2021-10-08  8:36       ` Xu, Rosen
2021-10-10  6:30       ` Matan Azrad
2021-10-11 21:59         ` Ferruh Yigit
2021-10-12  7:03           ` Matan Azrad
2021-10-12 11:03             ` Ferruh Yigit
2021-10-07 16:56     ` [dpdk-dev] [PATCH v5 " Ferruh Yigit
2021-10-07 16:56       ` [dpdk-dev] [PATCH v5 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-10-08 17:20         ` Ananyev, Konstantin
2021-10-09 10:58         ` lihuisong (C)
2021-10-07 16:56       ` [dpdk-dev] [PATCH v5 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-10-08 17:19         ` Ananyev, Konstantin
2021-10-07 16:56       ` [dpdk-dev] [PATCH v5 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
2021-10-08 17:11         ` Ananyev, Konstantin
2021-10-09 11:09           ` lihuisong (C)
2021-10-10  5:46         ` Matan Azrad
2021-10-07 16:56       ` [dpdk-dev] [PATCH v5 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-10-08 16:51         ` Ananyev, Konstantin
2021-10-11 19:50           ` Ferruh Yigit
2021-10-09 11:43         ` lihuisong (C)
2021-10-11 20:15           ` Ferruh Yigit
2021-10-12  4:02             ` lihuisong (C)
2021-10-07 16:56       ` [dpdk-dev] [PATCH v5 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-08 16:53         ` Ananyev, Konstantin
2021-10-08 15:57       ` [dpdk-dev] [PATCH v5 1/6] ethdev: fix max Rx packet length Ananyev, Konstantin
2021-10-11 19:47         ` Ferruh Yigit
2021-10-09 10:56       ` lihuisong (C)
2021-10-11 23:53     ` [dpdk-dev] [PATCH v6 " Ferruh Yigit
2021-10-11 23:53       ` [dpdk-dev] [PATCH v6 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-10-11 23:53       ` [dpdk-dev] [PATCH v6 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-10-11 23:53       ` [dpdk-dev] [PATCH v6 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
2021-10-12 17:20         ` Hyong Youb Kim (hyonkim)
2021-10-13  7:16         ` Michał Krawczyk
2021-10-11 23:53       ` [dpdk-dev] [PATCH v6 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-10-12  5:58         ` Andrew Rybchenko
2021-10-11 23:53       ` [dpdk-dev] [PATCH v6 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-12  6:02       ` [dpdk-dev] [PATCH v6 1/6] ethdev: fix max Rx packet length Andrew Rybchenko
2021-10-12  9:42       ` Ananyev, Konstantin
2021-10-13  7:08       ` Xu, Rosen
2021-10-15  1:31       ` Hyong Youb Kim (hyonkim)
2021-10-16  0:24       ` Ferruh Yigit
2021-10-18  8:54         ` Ferruh Yigit
2021-10-18 13:48     ` [dpdk-dev] [PATCH v7 " Ferruh Yigit
2021-10-18 13:48       ` [dpdk-dev] [PATCH v7 2/6] ethdev: move jumbo frame offload check to library Ferruh Yigit
2021-10-18 13:48       ` [dpdk-dev] [PATCH v7 3/6] ethdev: move check to library for MTU set Ferruh Yigit
2021-10-18 13:48       ` [dpdk-dev] [PATCH v7 4/6] ethdev: remove jumbo offload flag Ferruh Yigit
2021-10-21  0:43         ` Thomas Monjalon
2021-10-22 11:25           ` Ferruh Yigit
2021-10-22 11:29             ` Andrew Rybchenko
2021-10-18 13:48       ` [dpdk-dev] [PATCH v7 5/6] ethdev: unify MTU checks Ferruh Yigit
2021-10-18 13:48       ` [dpdk-dev] [PATCH v7 6/6] examples/ip_reassembly: remove unused parameter Ferruh Yigit
2021-10-18 17:31       ` [dpdk-dev] [PATCH v7 1/6] ethdev: fix max Rx packet length Ferruh Yigit
2021-11-05 14:19         ` Xueming(Steven) Li
2021-11-05 14:39           ` Ferruh Yigit

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