DPDK patches and discussions
 help / color / mirror / Atom feed
From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: "Iremonger, Bernard" <bernard.iremonger@intel.com>
Cc: dev@dpdk.org, "Richardson, Bruce" <bruce.richardson@intel.com>,
	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: Mon, 26 Sep 2016 18:59:26 +0200	[thread overview]
Message-ID: <2212551.lClP9YTigq@xps13> (raw)
In-Reply-To: <8CEF83825BEC744B83065625E567D7C21A08D383@IRSMSX108.ger.corp.intel.com>

2016-09-26 15:37, Iremonger, Bernard:
> Hi Thomas, Bruce,
> 
> <snip>
> 
> > Subject: Re: [dpdk-dev] [RFC PATCH v2 3/5] librte_ether: add API's for VF
> > management
> > 
> > 2016-09-23 17:02, Iremonger, Bernard:
> > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > 2016-09-23 09:53, Richardson, Bruce:
> > > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > > 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.?
> > > >
> > > > Very good point.
> > > > There are only few ethdev functions which are supported by every
> > > > drivers, like Rx/Tx and would not be available for VF from PF interface.
> > > >
> > > > > > > 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.
> > > >
> > > > Yes these devices would be special because their supported API would
> > > > be quite different. I was thinking that in the future you could add
> > > > most of the configuration functions through the VF mailbox.
> > > > But the Intel mailbox currently support only some special
> > > > configurations which are not supported by other devices even its own
> > > > VF device (except setting MAC address).
> > > > And when I read "set drop enable bit in the VF split rx control
> > > > register", it becomes clear it is really specific and has nothing to
> > > > do in the generic ethdev API.
> > > > That's why it is a NACK.
> > > >
> > > > When we want to use these very specific features we are aware of the
> > > > underlying device and driver. So we can directly include a header
> > > > from the driver. I suggest to retrieve a handler for the device
> > > > which is not a port id and will allow to call ixgbe functions directly.
> > > > It could be achieved by adding an ethdev function like discussed here:
> > > > 	http://dpdk.org/ml/archives/dev/2016-September/047392.html
> > > >
> > >
> > > I have been reading the net/vhost mail thread above. The following quote
> > is from this thread.
> > >
> > > "It means I would be in favor of introducing API in drivers for very specific
> > features."
> > >
> > > At present all the PMD functions are accessed through the eth_dev_ops
> > structure, there are no PMD API's.
> > >
> > > Is your proposal to add API(s) to the DPDK ixgbe PMD (similar to a driver
> > ioctl API) which can be accessed through a generic API in the ethdev?
> > 
> > Not exactly. I'm thinking about a PMD specific API.
> > The only ethdev API you need would be a function to retrieve a handler (an
> > opaque pointer on the device struct) from the port id.
> > Then you can include rte_ixgbe.h and directly call the specific ixgbe function,
> > passing the device handler.
> > How does it sound?
> 
> I have been prototyping this proposed solution, it appears to work.
> 
> I have added the following function:
> 
> int  rte_eth_dev_get_pmd_handle(uint8_t port_id, void** pmd_handle);
> 
> The pmd_handle is a pointer to a dev_ops structure containing driver specific functions.
> 
> Using the pmd_handle the driver specific functions can be called (without having them in struct eth_dev_ops)
> 
> Has this proposal been superseded by the discussion on the following patch?
> 
> [PATCH] net/vhost: Add function to retreive the 'vid' for a given port id

Maybe, it can be superseded by this discussion, yes.
Bruce thinks we do not need rte_eth_dev_get_pmd_handle().
What is your opinion about using port_id directly and retrieving the
structs from the driver via rte_eth_devices?

  reply	other threads:[~2016-09-26 16:59 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
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 [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=2212551.lClP9YTigq@xps13 \
    --to=thomas.monjalon@6wind.com \
    --cc=alexz@att.com \
    --cc=bernard.iremonger@intel.com \
    --cc=bruce.richardson@intel.com \
    --cc=dev@dpdk.org \
    --cc=jerin.jacob@caviumnetworks.com \
    --cc=rahul.r.shah@intel.com \
    --cc=wenzhuo.lu@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).