From: Bing Zhao <bingz@nvidia.com>
To: NBU-Contact-Thomas Monjalon <thomas@monjalon.net>
Cc: Ori Kam <orika@nvidia.com>,
"ferruh.yigit@intel.com" <ferruh.yigit@intel.com>,
"arybchenko@solarflare.com" <arybchenko@solarflare.com>,
"mdr@ashroe.eu" <mdr@ashroe.eu>,
"nhorman@tuxdriver.com" <nhorman@tuxdriver.com>,
"bernard.iremonger@intel.com" <bernard.iremonger@intel.com>,
"beilei.xing@intel.com" <beilei.xing@intel.com>,
"wenzhuo.lu@intel.com" <wenzhuo.lu@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v3 2/6] ethdev: add new attributes to hairpin config
Date: Tue, 13 Oct 2020 13:21:31 +0000 [thread overview]
Message-ID: <CY4PR1201MB0072920B644066D003949A61D0040@CY4PR1201MB0072.namprd12.prod.outlook.com> (raw)
In-Reply-To: <1745030.Et98dJ8b6a@thomas>
Hi Thomas,
> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Tuesday, October 13, 2020 8:42 PM
> To: Bing Zhao <bingz@nvidia.com>
> Cc: Ori Kam <orika@nvidia.com>; ferruh.yigit@intel.com;
> arybchenko@solarflare.com; mdr@ashroe.eu; nhorman@tuxdriver.com;
> bernard.iremonger@intel.com; beilei.xing@intel.com;
> wenzhuo.lu@intel.com; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v3 2/6] ethdev: add new attributes to
> hairpin config
>
> External email: Use caution opening links or attachments
>
>
> 13/10/2020 14:29, Bing Zhao:
> > From: Thomas Monjalon <thomas@monjalon.net>
> > > 08/10/2020 14:05, Bing Zhao:
> > > > struct rte_eth_hairpin_conf {
> > > > - uint16_t peer_count; /**< The number of peers. */
> > > > + uint32_t peer_count:16; /**< The number of peers. */
> > >
> > > Why not keeping uint16_t?
> >
> > The inside structure has a multiple of 4B, and the peer_count now
> only takes about 2B. AFAIK, usually, the structure will have an
> aligned length/offset and there will be some padding between the 2B
> + (2B pad) + 4B * 32 or 2B + (2B +2B) * 32 + 2B, depending on the
> compiler.
> > I changed to bit fields of a u32 due to the two facts:
> > 1. Using the 2B and keep the whole structure aligned. No waste
> except the reserved bits.
> > 2. Only u32 with bit fields is standard.
>
> Oh I see, this is because u16 bit fields are not standard?
In some compiler, it is supported. But in the old compiler, it might not and some warning will be raised.
" nonstandard extension used : bit-field types other than int "
"
The following properties of bit fields are implementation-defined:
Whether bit fields of type int are treated as signed or unsigned
Whether types other than int, signed int, unsigned int, and _Bool (since C99) are permitted
"
In C11, it should be supported already.
>
> > > > + uint32_t tx_explicit:1; /**< Explicit TX flow rule mode.
> */
> > > > + uint32_t manual_bind:1; /**< Manually bind hairpin
> queues.
> > > */
> > >
> > > Please describe more the expectations of these bits:
> > > What is changed at ethdev or PMD level?
> >
> > In ethdev level, there is almost no change. This attribute will be
> passed to PMD directly through the function pointer.
> > In PMD level, these bits should be checked and better to be saved.
> And the attribute fields should be checked for per queue pair and
> all the queues, and each queue pair should have the same attributes
> configured to make the behavior aligned. But it depends on the PMD
> itself to decide if all the queue pairs between a port pair should
> have the same attributes, or even all the queues from / to same port
> of all hairpin port pairs.
> > If manual_bind is not set, then the PMD will try to bind the
> queues and enable hairpin during device start stage and there is no
> need to call the bind / unbind API.
> > If tx_explicit is set, the application should insert the RX flow
> rules and TX flow rules separately and connect the RX/TX logic
> connection together.
> >
> > > What the application is supposed to do?
> >
> > The application should specify the new two attributes during the
> queue setup. And also, it could leave it unset (0 by default) to
> keep the behavior compatible with the previous release.
> > If manual_bind is set, then it is the application's responsibility
> to call the bind / unbind API to enable / disable the hairpin
> between specific ports.
> > If tx_explicit is set, as described above, the application should
> maintain the flows logic to make hairpin work as expected, e.g.,
> they can choose metadata (not the only method), in the RX flow, the
> metadata is set and in the TX flow, it is used for matching. Then
> even if the headers are changed with NAT action or encap, the
> hairpin function could work as expected.
> >
> > > Why choosing one mode or the other?
> >
> > If the application wants to have the full control of hairpin flows,
> it could chose the explicit TX flow mode.
> > If two or more ports involved into the hairpin, it is suggested to
> use the manual bind.
> > Please note, the actual supported attributes denpend on the PMD
> and HW.
>
> The application impact must be described shortly in doxygen please.
>
>
OK, sure. I added into the commit message. I will also describe it shortly in the doc.
Thanks
next prev parent reply other threads:[~2020-10-13 13:21 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-11 4:51 [dpdk-dev] [RFC] introduce support for hairpin between two ports Bing Zhao
2020-09-13 15:48 ` [dpdk-dev] [RFC PATCH v2 0/4] " Bing Zhao
2020-09-13 15:48 ` [dpdk-dev] [RFC PATCH v2 1/4] ethdev: add support for flow item transmit queue Bing Zhao
2020-09-13 15:48 ` [dpdk-dev] [RFC PATCH v2 2/4] testpmd: add item transmit queue in flow CLI Bing Zhao
2020-09-13 15:48 ` [dpdk-dev] [RFC PATCH v2 3/4] ethdev: add hairpin bind APIs Bing Zhao
2020-09-13 15:49 ` [dpdk-dev] [RFC PATCH v2 4/4] ethdev: add new attributes to hairpin queues config Bing Zhao
2020-10-01 0:25 ` [dpdk-dev] [PATCH 0/4] introduce support for hairpin between two ports Bing Zhao
2020-10-01 0:25 ` [dpdk-dev] [PATCH 1/4] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-04 9:20 ` Ori Kam
2020-10-07 11:21 ` Bing Zhao
2020-10-07 11:42 ` Ori Kam
2020-10-01 0:26 ` [dpdk-dev] [PATCH 2/4] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-04 9:22 ` Ori Kam
2020-10-07 11:32 ` Bing Zhao
2020-10-01 0:26 ` [dpdk-dev] [PATCH 3/4] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-04 9:34 ` Ori Kam
2020-10-07 11:34 ` Bing Zhao
2020-10-01 0:26 ` [dpdk-dev] [PATCH 4/4] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-04 9:39 ` Ori Kam
2020-10-07 11:36 ` Bing Zhao
2020-10-04 9:45 ` [dpdk-dev] [PATCH 0/4] introduce support for hairpin between two ports Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 0/6] " Bing Zhao
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 1/6] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-08 9:07 ` Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 2/6] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-08 9:23 ` Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 3/6] ethdev: add API to get hairpin peer ports list Bing Zhao
2020-10-08 9:40 ` Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 4/6] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-08 9:44 ` Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 5/6] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-08 9:45 ` Ori Kam
2020-10-08 8:51 ` [dpdk-dev] [PATCH v2 6/6] doc: update for two ports hairpin mode Bing Zhao
2020-10-08 9:47 ` Ori Kam
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 0/6] introduce support for hairpin between two ports Bing Zhao
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 1/6] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-14 14:35 ` Thomas Monjalon
2020-10-15 2:56 ` Bing Zhao
2020-10-15 7:31 ` Thomas Monjalon
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 2/6] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-12 21:37 ` Thomas Monjalon
2020-10-13 12:29 ` Bing Zhao
2020-10-13 12:41 ` Thomas Monjalon
2020-10-13 13:21 ` Bing Zhao [this message]
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 3/6] ethdev: add API to get hairpin peer ports list Bing Zhao
2020-10-08 12:31 ` Ori Kam
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 4/6] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 5/6] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-08 12:05 ` [dpdk-dev] [PATCH v3 6/6] doc: update for two ports hairpin mode Bing Zhao
2020-10-12 21:30 ` Thomas Monjalon
2020-10-13 1:13 ` Bing Zhao
2020-10-13 6:37 ` Thomas Monjalon
2020-10-13 6:40 ` Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 0/5] introduce support for hairpin between two ports Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 1/5] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-14 14:43 ` Thomas Monjalon
2020-10-15 2:59 ` Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 2/5] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 3/5] ethdev: add API to get hairpin peer ports list Bing Zhao
2020-10-14 15:02 ` Thomas Monjalon
2020-10-15 4:03 ` Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 4/5] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-13 16:19 ` [dpdk-dev] [PATCH v4 5/5] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 0/5] introduce support for hairpin between two ports Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 1/5] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-15 10:34 ` Thomas Monjalon
2020-10-15 11:39 ` Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 2/5] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-15 10:46 ` Thomas Monjalon
2020-10-15 13:45 ` Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 3/5] ethdev: add API to get hairpin peer ports list Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 4/5] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-15 5:35 ` [dpdk-dev] [PATCH v5 5/5] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 0/5] introduce support for hairpin between two ports Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 1/5] ethdev: add hairpin bind and unbind APIs Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 2/5] ethdev: add new attributes to hairpin config Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 3/5] ethdev: add API to get hairpin peer ports list Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 4/5] ethdev: add APIs for hairpin queue operation Bing Zhao
2020-10-15 13:08 ` [dpdk-dev] [PATCH v6 5/5] app/testpmd: change hairpin queues setup Bing Zhao
2020-10-15 23:03 ` [dpdk-dev] [PATCH v6 0/5] introduce support for hairpin between two ports Ferruh Yigit
2020-10-16 1:34 ` Bing Zhao
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