From: "Richardson, Bruce" <bruce.richardson@intel.com>
To: Thomas Monjalon <thomas.monjalon@6wind.com>
Cc: "Iremonger, Bernard" <bernard.iremonger@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Jerin Jacob <jerin.jacob@caviumnetworks.com>,
"Shah, Rahul R" <rahul.r.shah@intel.com>,
"Lu, Wenzhuo" <wenzhuo.lu@intel.com>, azelezniak <alexz@att.com>
Subject: Re: [dpdk-dev] [RFC PATCH v2 3/5] librte_ether: add API's for VF management
Date: Fri, 23 Sep 2016 09:53:49 +0000 [thread overview]
Message-ID: <59AF69C657FD0841A61C55336867B5B035AFEF9E@IRSMSX103.ger.corp.intel.com> (raw)
In-Reply-To: <3936536.tPp6g5Daih@xps13>
> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Friday, September 23, 2016 10:36 AM
> To: Richardson, Bruce <bruce.richardson@intel.com>
> Cc: Iremonger, Bernard <bernard.iremonger@intel.com>; dev@dpdk.org; Jerin
> Jacob <jerin.jacob@caviumnetworks.com>; Shah, Rahul R
> <rahul.r.shah@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; azelezniak
> <alexz@att.com>
> Subject: Re: [dpdk-dev] [RFC PATCH v2 3/5] librte_ether: add API's for VF
> management
>
> 2016-09-23 10:20, Bruce Richardson:
> > On Thu, Sep 22, 2016 at 07:04:37PM +0200, Thomas Monjalon wrote:
> > > 2016-09-15 16:46, Iremonger, Bernard:
> > > > > > > Do we really need to expose VF specific functions here?
> > > > > > > It can be generic(PF/VF) function indexed only through
> port_id.
> > > > > > > (example: as rte_eth_dev_set_vlan_anti_spoof(uint8_t
> > > > > > > port_id, uint8_t on)) For instance, In Thunderx PMD, We are
> > > > > > > not exposing a separate port_id for PF. We only enumerate
> > > > > > > 0..N VFs as 0..N ethdev port_id
> > > > > >
> > > > > > Our intention with this patch is to control the VF from the PF.
> > > > > >
> > > > > > The following librte_ether functions already work in a similar
> way:
> > > > > >
> > > > > > rte_eth_dev_set_vf_rxmode(uint8_t port_id, uint16_t vf,
> > > > > > uint16_t rx_mode, uint8_t on)
> > > > > >
> > > > > > rte_eth_dev_set_vf_rx(uint8_t port_id, uint16_t vf, uint8_t
> > > > > > on)
> > > > > >
> > > > > > rte_eth_dev_set_vf_tx(uint8_t port_id, uint16_t vf, uint8_t
> > > > > > on)
> > > > > >
> > > > > > int rte_eth_set_vf_rate_limit(uint8_t port_id, uint16_t vf,
> > > > > > uint16_t tx_rate, uint64_t q_msk)
> > > > >
> > > > > I have a bad feeling with these functions dedicated to VF from PF.
> > > > > Are we sure there is no other way?
> > > > > I mean we just need to know the VF with a port ID.
> > > >
> > > > When the VF is used in a VM the port ID of the VF is not visible to
> the PF.
> > > > I don't think there is another way to do this.
> > >
> > > I don't understand why we could not assign a port id to the VF from
> > > the host instead of having the couple PF port id / VF id.
> > > Can we enumerate all the VFs associated to a PF?
> > > Then can we allocate them a port id in the array rte_eth_devices?
> >
> > Hi Thomas,
> >
> > The VF is not a port visible to DPDK, though, so it shouldn't have a
> > port id IMHO. DPDK can't actually do anything with it.
>
> You say the contrary below.
Well, yes and no. The driver can manipulate things for the VF, but DPDK doesn't actually have a device that corresponds to the VF. There are no PCI bar mappings for it, DPDK can't do RX and TX with it etc.?
>
> > The PCI device for the VF is likely passed through to a different VM
> > and being used there. Unfortunately, the VF still needs certain things
> > done for it by the PF, so if the PF is under DPDK control, it needs to
> > provide the functionality to assist the VF.
>
> Why not have a VF_from_PF driver which does the mailbox things?
> So you can manage the VF from the PF with a simple port id.
> It really seems to be the cleanest design to me.
While I see your point, and it could work, I just want to be sure that we are ok with the results of that. Suppose we do create ethdevs for the VFs controlled by the PF. Does the new VF get counted in the rte_eth_dev_count() value (I assume yes)? How are apps meant to use the port? Do they have to put in a special case when iterating through all the port ids to check that it's not a pseudo port that can't do anything. None of the standard ethdev calls from an app will work on it, you can't configure nb rx/tx queues on it, you can't start or stop it, you can't do rx or tx on it, etc, etc.
/Bruce
next prev parent reply other threads:[~2016-09-23 9:53 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-18 13:48 [dpdk-dev] [RFC PATCH 0/5] " Bernard Iremonger
2016-08-18 13:48 ` [dpdk-dev] [RFC PATCH 1/5] librte_ether: add internal callback functions Bernard Iremonger
2016-08-18 13:48 ` [dpdk-dev] [RFC PATCH 2/5] net/ixgbe: add callback to user app on VF to PF mbox msg Bernard Iremonger
2016-08-18 13:48 ` [dpdk-dev] [RFC PATCH 3/5] librte_ether: add API's for VF management Bernard Iremonger
2016-08-18 13:48 ` [dpdk-dev] [RFC PATCH 4/5] net/ixgbe: add functions " Bernard Iremonger
2016-08-18 13:48 ` [dpdk-dev] [RFC PATCH 5/5] app/test_pmd: add tests for new API's Bernard Iremonger
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 0/5] add API's for VF management Bernard Iremonger
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 1/5] librte_ether: add internal callback functions Bernard Iremonger
2016-09-09 14:10 ` Jerin Jacob
[not found] ` <3C0218D8B3DD114D8DBFE6B68141FBE3185F9FE7@MISOUT7MSGUSRDI.ITServices.sbc.com>
2016-09-13 8:45 ` Jerin Jacob
[not found] ` <3C0218D8B3DD114D8DBFE6B68141FBE3185FDCDC@MISOUT7MSGUSRDI.ITServices.sbc.com>
2016-09-14 11:28 ` Jerin Jacob
2016-09-22 11:25 ` Iremonger, Bernard
2016-10-03 8:58 ` Iremonger, Bernard
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 2/5] net/ixgbe: add callback to user app on VF to PF mbox msg Bernard Iremonger
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 3/5] librte_ether: add API's for VF management Bernard Iremonger
2016-09-09 14:22 ` Jerin Jacob
2016-09-12 16:28 ` Iremonger, Bernard
2016-09-13 9:24 ` Thomas Monjalon
2016-09-15 16:46 ` Iremonger, Bernard
2016-09-22 17:04 ` Thomas Monjalon
2016-09-23 9:20 ` Bruce Richardson
2016-09-23 9:36 ` Thomas Monjalon
2016-09-23 9:53 ` Richardson, Bruce [this message]
2016-09-23 13:15 ` Thomas Monjalon
2016-09-23 17:02 ` Iremonger, Bernard
2016-09-23 17:18 ` Thomas Monjalon
2016-09-26 15:37 ` Iremonger, Bernard
2016-09-26 16:59 ` Thomas Monjalon
2016-09-27 10:31 ` Iremonger, Bernard
2016-09-27 13:01 ` Bruce Richardson
2016-09-27 14:13 ` Iremonger, Bernard
2016-09-28 11:23 ` Ananyev, Konstantin
2016-09-28 12:31 ` Iremonger, Bernard
2016-09-28 13:01 ` Richardson, Bruce
2016-09-28 13:03 ` Thomas Monjalon
2016-09-28 13:26 ` Ananyev, Konstantin
2016-09-28 14:24 ` Thomas Monjalon
2016-09-28 14:30 ` Ananyev, Konstantin
2016-09-28 14:48 ` Iremonger, Bernard
2016-09-28 15:00 ` Thomas Monjalon
2016-09-28 15:24 ` Iremonger, Bernard
2016-09-28 14:59 ` Thomas Monjalon
2016-09-28 16:52 ` Ananyev, Konstantin
2016-09-28 18:02 ` Thomas Monjalon
2016-09-30 9:21 ` Bruce Richardson
2016-09-23 10:34 ` Bruce Richardson
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 4/5] net/ixgbe: add functions " Bernard Iremonger
2016-08-26 9:10 ` [dpdk-dev] [RFC PATCH v2 5/5] app/test_pmd: add tests for new API's Bernard Iremonger
2016-09-11 12:35 ` Yuanhan Liu
2016-09-12 15:57 ` Iremonger, Bernard
2016-09-13 4:34 ` Yuanhan Liu
2016-09-13 8:38 ` Iremonger, Bernard
2016-09-13 8:42 ` Yuanhan Liu
2016-09-07 9:18 ` [dpdk-dev] [RFC PATCH v2 0/5] add API's for VF management Pattan, Reshma
2016-09-09 8:49 ` Pattan, Reshma
2016-09-09 13:02 ` Thomas Monjalon
2016-09-16 11:05 ` [dpdk-dev] [PATCH v3 0/3] " Bernard Iremonger
2016-09-16 11:05 ` [dpdk-dev] [PATCH v3 1/3] librte_ether: " Bernard Iremonger
2016-09-16 11:05 ` [dpdk-dev] [PATCH v3 2/3] net/ixgbe: add functions " Bernard Iremonger
2016-09-16 11:05 ` [dpdk-dev] [PATCH v3 3/3] app/test_pmd: add tests for new API's Bernard Iremonger
2016-09-16 14:15 ` [dpdk-dev] [PATCH v3 0/3] add API's for VF management Bernard Iremonger
2016-09-21 10:20 ` [dpdk-dev] [PATCH v4 " Bernard Iremonger
2016-09-29 14:16 ` [dpdk-dev] [PATCH v5 " Bernard Iremonger
2016-09-30 10:30 ` [dpdk-dev] [PATCH v6 0/2] " Bernard Iremonger
2016-09-30 10:30 ` [dpdk-dev] [PATCH v6 1/2] net/ixgbe: " Bernard Iremonger
2016-10-07 10:45 ` [dpdk-dev] [PATCH v7 0/2] " Bernard Iremonger
2016-10-07 10:45 ` [dpdk-dev] [PATCH v7 1/2] net/ixgbe: " Bernard Iremonger
2016-10-07 10:45 ` [dpdk-dev] [PATCH v7 2/2] app/test_pmd: add tests for new API's Bernard Iremonger
2016-10-11 15:09 ` Ferruh Yigit
2016-10-11 15:41 ` Thomas Monjalon
2016-10-11 15:51 ` Iremonger, Bernard
2016-10-11 16:32 ` Thomas Monjalon
2016-10-11 16:35 ` Iremonger, Bernard
2016-10-12 2:05 ` De Lara Guarch, Pablo
2016-10-12 15:00 ` Iremonger, Bernard
2016-09-30 10:30 ` [dpdk-dev] [PATCH v6 " Bernard Iremonger
2016-09-29 14:16 ` [dpdk-dev] [PATCH v5 1/3] librte_ether: add API for VF management Bernard Iremonger
2016-09-29 14:30 ` Thomas Monjalon
2016-09-29 15:16 ` Iremonger, Bernard
2016-09-29 16:19 ` Thomas Monjalon
2016-09-29 16:38 ` Iremonger, Bernard
2016-09-29 16:45 ` Thomas Monjalon
2016-09-29 14:16 ` [dpdk-dev] [PATCH v5 2/3] net/ixgbe: add API's " Bernard Iremonger
2016-09-29 16:11 ` Reshma Pattan
2016-09-29 16:32 ` Iremonger, Bernard
2016-09-29 16:16 ` Pattan, Reshma
2016-09-29 16:30 ` Iremonger, Bernard
2016-09-29 14:16 ` [dpdk-dev] [PATCH v5 3/3] app/test_pmd: add tests for new API's Bernard Iremonger
2016-09-21 10:20 ` [dpdk-dev] [PATCH v4 1/3] librte_ether: add API's for VF management Bernard Iremonger
2016-09-21 10:20 ` [dpdk-dev] [PATCH v4 2/3] net/ixgbe: add functions " Bernard Iremonger
2016-09-21 10:20 ` [dpdk-dev] [PATCH v4 3/3] app/test_pmd: add tests for new API's Bernard Iremonger
2016-09-16 14:15 ` [dpdk-dev] [PATCH v3 1/3] librte_ether: add API's for VF management Bernard Iremonger
2016-09-16 14:15 ` [dpdk-dev] [PATCH v3 2/3] net/ixgbe: add functions " Bernard Iremonger
2016-09-16 14:15 ` [dpdk-dev] [PATCH v3 3/3] app/test_pmd: add tests for new API's Bernard Iremonger
2016-09-28 19:25 [dpdk-dev] [RFC PATCH v2 3/5] librte_ether: add API's for VF management ZELEZNIAK, ALEX
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