From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "'David Harton (dharton)'" <dharton@cisco.com>,
"Wang, Liang-min" <liang-min.wang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v4 1/4] ethdev: add apis to support access device info
Date: Tue, 16 Jun 2015 18:15:08 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB97725836A11DCE@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB97725836A0A9E5@irsmsx105.ger.corp.intel.com>
> > > > > > > > > > +int
> > > > > > > > > > +rte_eth_dev_get_ringparam(uint8_t port_id, struct
> > > > > > > > > > +rte_dev_ring_info
> > > > > > > > > > +*info) {
> > > > > > > > > > + struct rte_eth_dev *dev;
> > > > > > > > > > +
> > > > > > > > > > + if (!rte_eth_dev_is_valid_port(port_id)) {
> > > > > > > > > > + PMD_DEBUG_TRACE("Invalid port_id=%d\n",
> > > > > port_id);
> > > > > > > > > > + return -ENODEV;
> > > > > > > > > > + }
> > > > > > > > > > +
> > > > > > > > > > + if ((dev= &rte_eth_devices[port_id]) == NULL) {
> > > > > > > > > > + PMD_DEBUG_TRACE("Invalid port device\n");
> > > > > > > > > > + return -ENODEV;
> > > > > > > > > > + }
> > > > > > > > > > +
> > > > > > > > > > + FUNC_PTR_OR_ERR_RET(*dev->dev_ops->get_ringparam, -
> > > > > > > > > ENOTSUP);
> > > > > > > > > > + return (*dev->dev_ops->get_ringparam)(dev, info); }
> > > > > > > > >
> > > > > > > > > I think it will be a useful addition to the ethdev API to
> > > > > > > > > have an ability to retrieve current RX/TX queue parameters.
> > > > > > > > > Though again, it need to be more generic, so it could be
> > > > > > > > > useful for
> > > > > > > > > non- ethtool upper layer too.
> > > > > > > > > So I suggest to modify it a bit.
> > > > > > > > > Something like that:
> > > > > > > > >
> > > > > > > > > struct rte_eth_tx_queue_info {
> > > > > > > > > struct rte_eth_txconf txconf;
> > > > > > > > > uint32_t nb_tx_desc;
> > > > > > > > > uint32_t nb_max_tx_desc; /*max allowable TXDs for that
> > > queue */
> > > > > > > > > uint32_t nb_tx_free; /* number of free TXDs at
> > > the moment
> > > > > of
> > > > > > > call.
> > > > > > > > > */
> > > > > > > > > /* other tx queue data. */ };
> > > > > > > > >
> > > > > > > > > int rte_etdev_get_tx_queue_info(portid, queue_id, struct
> > > > > > > > > rte_eth_tx_queue_info *qinfo)
> > > > > > > > >
> > > > > > > > > Then, your upper layer ethtool wrapper, can implement yours
> > > > > > > > > ethtool_get_ringparam() by:
> > > > > > > > >
> > > > > > > > > ...
> > > > > > > > > struct rte_eth_tx_queue_info qinfo;
> > > > > > > > > rte_ethdev_get_tx_queue_info(port, 0, &qinfo);
> > > > > > > > > ring_param->tx_pending = qinfo.nb_tx_desc -
> > > > > > > > > rte_eth_rx_queue_count(port, 0);
> > > > > > > > >
> > > > > > > > > Or probably even:
> > > > > > > > > ring_param->tx_pending = qinfo.nb_tx_desc -
> > > > > > > > > qinfo.nb_tx_free;
> > > > > > > > >
> > > > > > > > > Same for RX.
> > > > > > > > >
> > > > > > > > For now, this descriptor ring information is used by the ethtool
> > > op.
> > > > > > > > To make this interface simple, i.e. caller doesn't need to
> > > > > > > > access other
> > > > > > > queue information.
> > > > > > >
> > > > > > > I just repeat what I said to you in off-line conversation:
> > > > > > > ethdev API is not equal ethtool API.
> > > > > > > It is ok to add a new function/structure to ethdev if it really
> > > > > > > needed, but we should do mechanical one to one copy.
> > > > > > > It is much better to add a function/structure that would be
> > > > > > > more generic, and suit other users, not only ethtool.
> > > > > > > There is no point to have dozen functions in rte_ethdev API
> > > > > > > providing similar information.
> > > > > > > BTW, I don't see how API I proposed is much more complex, then
> > > > > > > yours
> > > > > one.
> > > > > > The ring parameter is a run-time information which is different
> > > > > > than data
> > > > > structure described in this discussion.
> > > > >
> > > > > I don't see how they are different.
> > > > > Looking at ixgbe_get_ringparam(), it returns:
> > > > > rx_max_pending - that's a static IXGBE PMD value (max possible
> > > > > number of RXDs per one queue).
> > > > > rx_pending - number of RXD currently in use by the HW for queue 0
> > > > > (that information can be changed at each call).
> > > > >
> > > > > With the approach I suggesting - you can get same information for
> > > > > each RX queue by calling rte_ethdev_get_rx_queue_info() and
> > > > > rte_eth_rx_queue_count().
> > > > > Plus you are getting other RX queue data.
> > > > >
> > > > > Another thing - what is practical usage of the information you
> > > > > retrieving now by get_ringparam()?
> > > > > Let say it returned to you: rx_max_pending=4096; rx_pending=128; How
> > > > > that information would help to understand what is going on with the
> > > device?
> > > > > Without knowing value of nb_tx_desc for the queue, you can't say is
> > > > > you queue full or not.
> > > > > Again, it could be that all your traffic going through some other
> > > > > queue (not 0).
> > > > > So from my point rte_eth_dev_get_ringparam() usage is very limited,
> > > > > and doesn't provide enough information about current queue state.
> > > > >
> > > > > Same thing applies for TX.
> > > > >
> > > >
> > > > After careful review the suggestion in this comment, and review the
> > > existing dpdk source code.
> > > > I came to realize that neither rte_ethdev_get_rx_queue_info,
> > > > rte_ethdev_get_tx_queue_info, struct rte_eth_rx_queue_info and struct
> > > > rte_eth_tx_queue_info are available in the existing dpdk source code. I
> > > could not make a patch based upon a set of non- existent API and data
> > > structure.
> > >
> > > Right now, in dpdk.org source code, struct rte_eth_dev_ring_info, struct
> > > rte_dev_eeprom_info and struct rte_dev_reg_info don't exist also.
> > > Same as all these functions:
> > >
> > > rte_eth_dev_default_mac_addr_set
> > > rte_eth_dev_reg_length
> > > rte_eth_dev_reg_info
> > > rte_eth_dev_eeprom_length
> > > rte_eth_dev_get_eeprom
> > > rte_eth_dev_set_eeprom
> > > rte_eth_dev_get_ringparam
> > >
> > > All this is a new API that's you are trying to add.
> > > But, by some reason you consider it is ok to add 'struct
> > > rte_eth_dev_ring_info', but couldn't add struct
> > > 'rte_ethdev_get_tx_queue_info'
> > > That just doesn't make any sense to me.
> > > In fact, I think our conversation is going in cycles.
> > > If you are not happy with the suggested approach, please provide some
> > > meaningful reason why.
> > > Konstantin
> >
> > It seems the new API aims at providing users a mechanism to quickly and
> > gracefully migrate from using ethtool/ioctl calls.
>
> I am fine with that goal in general.
> But it doesn't mean that all ethool API should be pushed into rte_ethdev layer.
> That's why a shim layer on top of rte_ethdev is created -
> it's goal is to provide for the upper layer an ethool-like API and
> hide actual implementation based on rte_ethdev API inside.
>
> > The provided get/set
> > ring param info is very similar to that of ethtool and facilitates the
> > ethtool needs.
>
Actually a quick questions to you guys:
Looking at linux struct ethtool_ringparam description, I am seeing:
http://lxr.free-electrons.com/source/include/uapi/linux/ethtool.h:
@rx_pending: Current maximum number of pending entries per RX ring
And all linux driver I looked at (ixgbe,i40e,virtio,vmxbet3) returns number
of configured RX descriptors for queue 0.
In DPDK terms: nb_desc for the queue.
While in Larry's patch, ixgbe_get_ringparam() for rx_pending returns
number of RX descriptors that are in HW use (for queue 0).
So, did you intentionally change linux ethool get_ringparam() behaviour here,
or is it just a mistake?
Konstantin
next prev parent reply other threads:[~2015-06-16 18:15 UTC|newest]
Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-30 0:37 [dpdk-dev] [PATCH 0/2] User-space Ethtool Liang-Min Larry Wang
2015-05-30 0:37 ` [dpdk-dev] [PATCH 1/2] ethdev: add api to set default mac address Liang-Min Larry Wang
2015-05-30 1:57 ` Andrew Harvey (agh)
2015-05-30 0:37 ` [dpdk-dev] [PATCH 2/2] ethtool: add new library to provide ethtool-alike APIs Liang-Min Larry Wang
2015-05-30 15:48 ` Stephen Hemminger
2015-05-30 16:16 ` Wang, Liang-min
2015-05-30 19:26 ` Stephen Hemminger
2015-05-30 19:40 ` Wang, Liang-min
2015-05-31 16:48 ` Stephen Hemminger
2015-05-31 17:30 ` Wang, Liang-min
2015-05-31 18:31 ` Wang, Liang-min
2015-06-01 12:42 ` David Harton (dharton)
2015-06-10 15:09 ` [dpdk-dev] [PATCH v4 0/4] User-space Ethtool Liang-Min Larry Wang
2015-06-10 15:09 ` [dpdk-dev] [PATCH v4 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-10 15:21 ` David Harton (dharton)
2015-06-11 12:26 ` Ananyev, Konstantin
2015-06-11 12:57 ` Wang, Liang-min
2015-06-11 13:07 ` Ananyev, Konstantin
2015-06-11 21:51 ` Wang, Liang-min
2015-06-12 12:30 ` Ananyev, Konstantin
2015-06-15 13:26 ` Wang, Liang-min
2015-06-15 13:45 ` Ananyev, Konstantin
2015-06-15 14:47 ` Wang, Liang-min
2015-06-15 18:10 ` Ananyev, Konstantin
2015-06-17 17:25 ` Ananyev, Konstantin
2015-06-15 16:05 ` David Harton (dharton)
2015-06-15 18:23 ` Ananyev, Konstantin
2015-06-16 18:15 ` Ananyev, Konstantin [this message]
2015-06-11 13:14 ` Ananyev, Konstantin
2015-06-11 13:25 ` Wang, Liang-min
2015-06-10 15:09 ` [dpdk-dev] [PATCH v4 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-10 15:09 ` [dpdk-dev] [PATCH v4 3/4] igb: " Liang-Min Larry Wang
2015-06-10 15:09 ` [dpdk-dev] [PATCH v4 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-11 21:43 ` [dpdk-dev] [PATCH v5 0/4] User-space Ethtool Liang-Min Larry Wang
2015-06-11 21:43 ` [dpdk-dev] [PATCH v5 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-11 21:43 ` [dpdk-dev] [PATCH v5 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-11 21:43 ` [dpdk-dev] [PATCH v5 3/4] igb: " Liang-Min Larry Wang
2015-06-11 21:43 ` [dpdk-dev] [PATCH v5 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-12 22:03 ` [dpdk-dev] [PATCH v6 0/4] User-space Ethtool Liang-Min Larry Wang
2015-06-12 22:03 ` [dpdk-dev] [PATCH v6 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-13 23:25 ` David Harton (dharton)
2015-06-12 22:03 ` [dpdk-dev] [PATCH v6 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-12 22:03 ` [dpdk-dev] [PATCH v6 3/4] igb: " Liang-Min Larry Wang
2015-06-12 22:03 ` [dpdk-dev] [PATCH v6 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-13 0:21 ` [dpdk-dev] [PATCH v6 0/4] User-space Ethtool Andrew Harvey (agh)
2015-06-17 22:22 ` [dpdk-dev] [PATCH v7 " Liang-Min Larry Wang
2015-06-17 22:22 ` [dpdk-dev] [PATCH v7 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-25 13:39 ` Stephen Hemminger
2015-06-25 20:58 ` Wang, Liang-min
2015-06-25 13:44 ` Stephen Hemminger
2015-06-25 21:05 ` Wang, Liang-min
2015-06-17 22:22 ` [dpdk-dev] [PATCH v7 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-25 13:45 ` Stephen Hemminger
2015-06-26 6:26 ` Andrew Harvey (agh)
2015-06-17 22:22 ` [dpdk-dev] [PATCH v7 3/4] igb: " Liang-Min Larry Wang
2015-06-17 22:22 ` [dpdk-dev] [PATCH v7 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-18 2:04 ` [dpdk-dev] [PATCH v7 0/4] User-space Ethtool Stephen Hemminger
2015-06-18 12:47 ` Wang, Liang-min
2015-06-23 15:19 ` Wang, Liang-min
2015-06-24 13:55 ` Andrew Harvey (agh)
2015-06-24 17:16 ` David Harton (dharton)
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 0/5] " Liang-Min Larry Wang
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 1/5] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-26 16:51 ` Stephen Hemminger
2015-06-26 17:05 ` Wang, Liang-min
2015-06-27 1:21 ` Wang, Liang-min
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 2/5] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 3/5] igb: " Liang-Min Larry Wang
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 4/5] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-26 14:26 ` [dpdk-dev] [PATCH v8 5/5] Changed register tables to const Liang-Min Larry Wang
2015-06-26 19:15 ` [dpdk-dev] [PATCH v8 0/5] User-space Ethtool Ananyev, Konstantin
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 " Liang-Min Larry Wang
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 1/5] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 2/5] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-27 1:32 ` Stephen Hemminger
2015-06-27 2:37 ` Wang, Liang-min
2015-06-27 1:34 ` Stephen Hemminger
2015-06-27 2:39 ` Wang, Liang-min
2015-06-27 1:34 ` Stephen Hemminger
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 3/5] igb: " Liang-Min Larry Wang
2015-06-27 1:35 ` Stephen Hemminger
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 4/5] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-27 1:19 ` [dpdk-dev] [PATCH v9 5/5] ixgbe/igb: changed register tables to const Liang-Min Larry Wang
2015-06-27 1:36 ` Stephen Hemminger
2015-06-27 1:50 ` Wang, Liang-min
2015-06-27 2:40 ` Wang, Liang-min
2015-07-10 12:55 ` Wang, Liang-min
2015-06-27 2:36 ` [dpdk-dev] [PATCH v10 0/4] User-space Ethtool Liang-Min Larry Wang
2015-06-27 2:36 ` [dpdk-dev] [PATCH v10 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-27 2:36 ` [dpdk-dev] [PATCH v10 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-27 2:36 ` [dpdk-dev] [PATCH v10 3/4] igb: " Liang-Min Larry Wang
2015-06-27 2:36 ` [dpdk-dev] [PATCH v10 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-06-27 12:25 ` [dpdk-dev] [PATCH v11 0/4] User-space Ethtool Liang-Min Larry Wang
2015-06-27 12:25 ` [dpdk-dev] [PATCH v11 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-06-27 12:25 ` [dpdk-dev] [PATCH v11 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-06-27 12:25 ` [dpdk-dev] [PATCH v11 3/4] igb: " Liang-Min Larry Wang
2015-06-27 12:25 ` [dpdk-dev] [PATCH v11 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-07 17:39 ` [dpdk-dev] [PATCH v12 0/4] User-space Ethtool Liang-Min Larry Wang
2015-07-07 17:39 ` [dpdk-dev] [PATCH v12 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-07 17:39 ` [dpdk-dev] [PATCH v12 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-07 17:39 ` [dpdk-dev] [PATCH v12 3/4] igb: " Liang-Min Larry Wang
2015-07-07 17:39 ` [dpdk-dev] [PATCH v12 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-10 12:48 ` [dpdk-dev] [PATCH v13 0/4] User-space Ethtool Liang-Min Larry Wang
2015-07-10 12:48 ` [dpdk-dev] [PATCH v13 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-10 12:48 ` [dpdk-dev] [PATCH v13 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-10 12:48 ` [dpdk-dev] [PATCH v13 3/4] igb: " Liang-Min Larry Wang
2015-07-10 12:48 ` [dpdk-dev] [PATCH v13 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-12 21:22 ` [dpdk-dev] [PATCH v14 0/4] User-space Ethtool Liang-Min Larry Wang
2015-07-12 21:22 ` [dpdk-dev] [PATCH v14 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-13 22:26 ` Thomas Monjalon
2015-07-12 21:22 ` [dpdk-dev] [PATCH v14 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-12 21:22 ` [dpdk-dev] [PATCH v14 3/4] igb: " Liang-Min Larry Wang
2015-07-12 21:22 ` [dpdk-dev] [PATCH v14 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-14 2:18 ` [dpdk-dev] [PATCH v15 0/4] User-space Ethtool Liang-Min Larry Wang
2015-07-14 2:18 ` [dpdk-dev] [PATCH v15 1/4] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-15 6:16 ` Thomas Monjalon
2015-07-15 10:07 ` Wang, Liang-min
2015-07-15 10:27 ` Thomas Monjalon
2015-07-15 10:48 ` Wang, Liang-min
2015-07-15 11:20 ` Thomas Monjalon
2015-07-15 11:36 ` Wang, Liang-min
2015-07-15 12:06 ` Thomas Monjalon
2015-07-14 2:18 ` [dpdk-dev] [PATCH v15 2/4] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-14 2:18 ` [dpdk-dev] [PATCH v15 3/4] igb: " Liang-Min Larry Wang
2015-07-14 2:18 ` [dpdk-dev] [PATCH v15 4/4] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 0/6] User-space Ethtool Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 1/6] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 2/6] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 3/6] igb: " Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 4/6] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 5/6] ethdev: change api name, version information and fix macro Liang-Min Larry Wang
2015-07-14 13:11 ` [dpdk-dev] [PATCH v16 6/6] examples/l2fwd-ethtool: replace lib with new API name Liang-Min Larry Wang
2015-07-14 20:13 ` [dpdk-dev] [PATCH v16 0/6] User-space Ethtool Thomas Monjalon
2015-07-14 20:56 ` Wang, Liang-min
2015-07-15 5:53 ` Thomas Monjalon
2015-07-15 10:15 ` Wang, Liang-min
2015-07-15 10:30 ` Thomas Monjalon
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 0/5] " Liang-Min Larry Wang
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 1/5] ethdev: add api to support setting default mac addr Liang-Min Larry Wang
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 2/5] ethdev: add apis to support access device info Liang-Min Larry Wang
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 3/5] ixgbe: add ops to support ethtool ops Liang-Min Larry Wang
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 4/5] igb: " Liang-Min Larry Wang
2015-07-16 13:25 ` [dpdk-dev] [PATCH v17 5/5] examples: new example: l2fwd-ethtool Liang-Min Larry Wang
2015-07-16 21:25 ` Thomas Monjalon
2015-07-16 21:48 ` [dpdk-dev] [PATCH v17 0/5] User-space Ethtool Thomas Monjalon
2015-07-16 21:55 ` Wang, Liang-min
2015-07-16 22:09 ` Thomas Monjalon
2015-07-16 22:15 ` Wang, Liang-min
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