From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Chengchang Tang <tangchengchang@huawei.com>,
"Yigit, Ferruh" <ferruh.yigit@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "linuxarm@huawei.com" <linuxarm@huawei.com>,
"chas3@att.com" <chas3@att.com>,
"humin29@huawei.com" <humin29@huawei.com>
Subject: Re: [dpdk-dev] [RFC 0/2] add Tx prepare support for bonding device
Date: Tue, 20 Apr 2021 08:33:23 +0000 [thread overview]
Message-ID: <DM6PR11MB4491DA4721949C6D0D56F3729A489@DM6PR11MB4491.namprd11.prod.outlook.com> (raw)
In-Reply-To: <b68da1e1-e202-30db-4005-41d1cf6e6183@huawei.com>
Hi everyone,
>
> On 2021/4/20 9:26, Ferruh Yigit wrote:
> > On 4/16/2021 12:04 PM, Chengchang Tang wrote:
> >> This patch add Tx prepare for bonding device.
> >>
> >> Currently, the bonding driver has not implemented the callback of
> >> rte_eth_tx_prepare function. Therefore, the TX prepare function of the
> >> slave devices will never be invoked. When hardware offloading such as
> >> CKSUM and TSO are enabled for some drivers, tx_prepare needs to be used
> >> to adjust packets (for example, set correct pseudo packet headers).
> >> Otherwise, related offloading fails and even packets are sent
> >> incorrectly. Due to this limitation, the bonded device cannot use these
> >> HW offloading in the Tx direction.
> >>
> >> Because packet sending algorithms are numerous and complex in bond PMD,
> >> it is hard to design the callback for rte_eth_tx_prepare. In this patch,
> >> the tx_prepare callback of bonding PMD is not implemented. Instead,
> >> rte_eth_tx_prepare has been called in tx_burst callback. And a global
> >> variable is introduced to control whether the bonded device need call
> >> the rte_eth_tx_prepare. If upper-layer users need to use some TX
> >> offloading that depend on tx_prepare , they should enable the preparation
> >> function. In this way, the bonded device will call the rte_eth_tx_prepare
> >> for the fast path packets in the tx_burst callback.
I admit that I didn't look at the implementation yet, but it sounds like
overcomplication to me. Can't we just have a new TX function for bonding PMD
when TX offloads are enabled? And inside that function we will do:
tx_prepare(); tx_burst(); for selected device.
We can select this function at setup stage analysing requested by user TX offloads.
> >>
> >
> > What do you think to add a devarg to bonding PMD to control the tx_prepare?
> > It won't be as dynamic as API, since it can be possible to change the behavior after application is started with API, but do we really need
> this?
>
> If an API is not added, unnecessary constraints may be introduced. If the
> bonding device is created through the rte_eth_bond_create interface instead
> devarg "vdev", this function cannot be used because devargs does not take effect
> in this case. But from an ease-of-use perspective, adding a devarg is a good
> idea. I will add related implementations in the later official patches.
I am also against introducing new devarg to control tx_prepare() invocation.
I think at dev_config/queue_setup phase PMD will have enough information to decide.
>
> If I understand correctly, the current community does not want to introduce
> more private APIs for PMDs. However, the absence of an API on this issue would
> introduce some unnecessary constraints, and from that point of view, I think
> adding an API seems necessary.
> >
> >> Chengchang Tang (2):
> >> net/bonding: add Tx prepare for bonding
> >> app/testpmd: add cmd for bonding Tx prepare
> >>
> >> app/test-pmd/cmdline.c | 66 +++++++++++++++++++++++++++++
> >> doc/guides/testpmd_app_ug/testpmd_funcs.rst | 9 ++++
> >> drivers/net/bonding/eth_bond_private.h | 1 +
> >> drivers/net/bonding/rte_eth_bond.h | 29 +++++++++++++
> >> drivers/net/bonding/rte_eth_bond_api.c | 28 ++++++++++++
> >> drivers/net/bonding/rte_eth_bond_pmd.c | 33 +++++++++++++--
> >> drivers/net/bonding/version.map | 5 +++
> >> 7 files changed, 167 insertions(+), 4 deletions(-)
> >>
> >> --
> >> 2.7.4
> >>
> >
> >
> > .
> >
next prev parent reply other threads:[~2021-04-20 8:33 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 11:04 Chengchang Tang
2021-04-16 11:04 ` [dpdk-dev] [RFC 1/2] net/bonding: add Tx prepare for bonding Chengchang Tang
2021-04-16 11:04 ` [dpdk-dev] [RFC 2/2] app/testpmd: add cmd for bonding Tx prepare Chengchang Tang
2021-04-16 11:12 ` [dpdk-dev] [RFC 0/2] add Tx prepare support for bonding device Min Hu (Connor)
2021-04-20 1:26 ` Ferruh Yigit
2021-04-20 2:44 ` Chengchang Tang
2021-04-20 8:33 ` Ananyev, Konstantin [this message]
2021-04-20 12:44 ` Chengchang Tang
2021-04-20 13:18 ` Ananyev, Konstantin
2021-04-20 14:06 ` Chengchang Tang
2021-04-23 9:46 ` [dpdk-dev] [PATCH " Chengchang Tang
2021-04-23 9:46 ` [dpdk-dev] [PATCH 1/2] net/bonding: support Tx prepare for bonding Chengchang Tang
2021-06-08 9:49 ` Andrew Rybchenko
2021-06-09 6:42 ` Chengchang Tang
2021-06-09 9:35 ` Andrew Rybchenko
2021-06-10 7:32 ` Chengchang Tang
2021-06-14 14:16 ` Andrew Rybchenko
2021-06-09 10:25 ` Ananyev, Konstantin
2021-06-10 6:46 ` Chengchang Tang
2021-06-14 11:36 ` Ananyev, Konstantin
2022-05-24 12:11 ` Min Hu (Connor)
2022-07-25 4:08 ` [PATCH v2 0/3] add Tx prepare support for bonding driver Chengwen Feng
2022-07-25 4:08 ` [PATCH v2 1/3] net/bonding: support Tx prepare Chengwen Feng
2022-09-13 10:22 ` Ferruh Yigit
2022-09-13 15:08 ` Chas Williams
2022-09-14 0:46 ` fengchengwen
2022-09-14 16:59 ` Chas Williams
2022-09-17 2:35 ` fengchengwen
2022-09-17 13:38 ` Chas Williams
2022-09-19 14:07 ` Konstantin Ananyev
2022-09-19 23:02 ` Chas Williams
2022-09-22 2:12 ` fengchengwen
2022-09-25 10:32 ` Chas Williams
2022-09-26 10:18 ` Konstantin Ananyev
2022-09-26 16:36 ` Chas Williams
2022-07-25 4:08 ` [PATCH v2 2/3] net/bonding: support Tx prepare fail stats Chengwen Feng
2022-07-25 4:08 ` [PATCH v2 3/3] net/bonding: add testpmd cmd for Tx prepare Chengwen Feng
2022-07-25 7:04 ` [PATCH v2 0/3] add Tx prepare support for bonding driver humin (Q)
2022-09-13 1:41 ` fengchengwen
2022-09-17 4:15 ` [PATCH v3 " Chengwen Feng
2022-09-17 4:15 ` [PATCH v3 1/3] net/bonding: support Tx prepare Chengwen Feng
2022-09-17 4:15 ` [PATCH v3 2/3] net/bonding: support Tx prepare fail stats Chengwen Feng
2022-09-17 4:15 ` [PATCH v3 3/3] net/bonding: add testpmd cmd for Tx prepare Chengwen Feng
2022-10-09 3:36 ` [PATCH v4] net/bonding: call Tx prepare before Tx burst Chengwen Feng
2022-10-10 19:42 ` Chas Williams
2022-10-11 13:28 ` fengchengwen
2022-10-11 13:20 ` [PATCH v5] " Chengwen Feng
2022-10-15 15:26 ` Chas Williams
2022-10-18 14:25 ` fengchengwen
2022-10-20 7:07 ` Andrew Rybchenko
2021-04-23 9:46 ` [dpdk-dev] [PATCH 2/2] net/bonding: support configuring Tx offloading for bonding Chengchang Tang
2021-06-08 9:49 ` Andrew Rybchenko
2021-06-09 6:57 ` Chengchang Tang
2021-06-09 9:11 ` Ananyev, Konstantin
2021-06-09 9:37 ` Andrew Rybchenko
2021-06-10 6:29 ` Chengchang Tang
2021-06-14 11:05 ` Ananyev, Konstantin
2021-06-14 14:13 ` Andrew Rybchenko
2021-04-30 6:26 ` [dpdk-dev] [PATCH 0/2] add Tx prepare support for bonding device Chengchang Tang
2021-04-30 6:47 ` Min Hu (Connor)
2021-06-03 1:44 ` Chengchang Tang
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