From: Stephen Hemminger <stephen@networkplumber.org>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
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dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v3 1/6] ethdev: fix max Rx packet length
Date: Fri, 1 Oct 2021 08:07:55 -0700 [thread overview]
Message-ID: <20211001080755.21647298@hermes.local> (raw)
In-Reply-To: <20211001143624.3744505-1-ferruh.yigit@intel.com>
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.
next prev parent reply other threads:[~2021-10-01 15:08 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 ` Stephen Hemminger [this message]
2021-10-05 16:46 ` [dpdk-dev] [PATCH v3 1/6] ethdev: fix max Rx packet length Ferruh Yigit
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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