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Thu, 15 Mar 2018 23:08:33 +0800 From: "Zhang, Qi Z" To: "Ananyev, Konstantin" , "thomas@monjalon.net" CC: "dev@dpdk.org" , "Xing, Beilei" , "Wu, Jingjing" , "Lu, Wenzhuo" Thread-Topic: [dpdk-dev] [PATCH v2 1/4] ether: support deferred queue setup Thread-Index: AQHTsdzO/92qABmyvEqdvvZYHITpPKPPNw0AgAFIbcCAAFZxAIAAm4gA Date: Thu, 15 Mar 2018 15:08:32 +0000 Message-ID: <039ED4275CED7440929022BC67E706115316E27D@SHSMSX103.ccr.corp.intel.com> References: <20180212045314.171616-1-qi.z.zhang@intel.com> <20180302041306.90324-1-qi.z.zhang@intel.com> <20180302041306.90324-2-qi.z.zhang@intel.com> <2601191342CEEE43887BDE71AB9772589E28FA63@irsmsx105.ger.corp.intel.com> <039ED4275CED7440929022BC67E706115316DF0F@SHSMSX103.ccr.corp.intel.com> <2601191342CEEE43887BDE71AB9772589E2901FF@irsmsx105.ger.corp.intel.com> In-Reply-To: <2601191342CEEE43887BDE71AB9772589E2901FF@irsmsx105.ger.corp.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.0.0.116 dlp-reaction: no-action x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [dpdk-dev] [PATCH v2 1/4] ether: support deferred queue setup X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Mar 2018 15:10:15 -0000 > -----Original Message----- > From: Ananyev, Konstantin > Sent: Thursday, March 15, 2018 9:17 PM > To: Zhang, Qi Z ; thomas@monjalon.net > Cc: dev@dpdk.org; Xing, Beilei ; Wu, Jingjing > ; Lu, Wenzhuo > Subject: RE: [dpdk-dev] [PATCH v2 1/4] ether: support deferred queue setu= p >=20 > Hi Qi, >=20 > > -----Original Message----- > > From: Zhang, Qi Z > > Sent: Thursday, March 15, 2018 3:14 AM > > To: Ananyev, Konstantin ; > > thomas@monjalon.net > > Cc: dev@dpdk.org; Xing, Beilei ; Wu, Jingjing > > ; Lu, Wenzhuo > > Subject: RE: [dpdk-dev] [PATCH v2 1/4] ether: support deferred queue > > setup > > > > Hi Konstantin: > > > > > -----Original Message----- > > > From: Ananyev, Konstantin > > > Sent: Wednesday, March 14, 2018 8:32 PM > > > To: Zhang, Qi Z ; thomas@monjalon.net > > > Cc: dev@dpdk.org; Xing, Beilei ; Wu, Jingjing > > > ; Lu, Wenzhuo ; Zhang, > > > Qi Z > > > Subject: RE: [dpdk-dev] [PATCH v2 1/4] ether: support deferred queue > > > setup > > > > > > Hi Qi, > > > > > > > > > > > The patch let etherdev driver expose the capability flag through > > > > rte_eth_dev_info_get when it support deferred queue configuraiton, > > > > then base on the flag rte_eth_[rx|tx]_queue_setup could decide > > > > continue to setup the queue or just return fail when device > > > > already started. > > > > > > > > Signed-off-by: Qi Zhang > > > > --- > > > > doc/guides/nics/features.rst | 8 ++++++++ > > > > lib/librte_ether/rte_ethdev.c | 30 ++++++++++++++++++------------ > > > > lib/librte_ether/rte_ethdev.h | 11 +++++++++++ > > > > 3 files changed, 37 insertions(+), 12 deletions(-) > > > > > > > > diff --git a/doc/guides/nics/features.rst > > > > b/doc/guides/nics/features.rst index 1b4fb979f..36ad21a1f 100644 > > > > --- a/doc/guides/nics/features.rst > > > > +++ b/doc/guides/nics/features.rst > > > > @@ -892,7 +892,15 @@ Documentation describes performance > values. > > > > > > > > See ``dpdk.org/doc/perf/*``. > > > > > > > > +.. _nic_features_queue_deferred_setup_capabilities: > > > > > > > > +Queue deferred setup capabilities > > > > +--------------------------------- > > > > + > > > > +Supports queue setup / release after device started. > > > > + > > > > +* **[provides] rte_eth_dev_info**: > > > > > > > > ``deferred_queue_config_capa:DEV_DEFERRED_RX_QUEUE_SETUP,DEV_DEFE > > > RRED_ > > > > TX_QUEUE_SETUP,DEV_DEFERRED_RX_QUEUE_RELE > > > > ASE,DEV_DEFERRED_TX_QUEUE_RELEASE``. > > > > +* **[related] API**: ``rte_eth_dev_info_get()``. > > > > > > > > .. _nic_features_other: > > > > > > > > diff --git a/lib/librte_ether/rte_ethdev.c > > > > b/lib/librte_ether/rte_ethdev.c index a6ce2a5ba..6c906c4df 100644 > > > > --- a/lib/librte_ether/rte_ethdev.c > > > > +++ b/lib/librte_ether/rte_ethdev.c > > > > @@ -1425,12 +1425,6 @@ rte_eth_rx_queue_setup(uint16_t port_id, > > > uint16_t rx_queue_id, > > > > return -EINVAL; > > > > } > > > > > > > > - if (dev->data->dev_started) { > > > > - RTE_PMD_DEBUG_TRACE( > > > > - "port %d must be stopped to allow configuration\n", > port_id); > > > > - return -EBUSY; > > > > - } > > > > - > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, > > > -ENOTSUP); > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_setup, > > > -ENOTSUP); > > > > > > > > @@ -1474,10 +1468,19 @@ rte_eth_rx_queue_setup(uint16_t > port_id, > > > uint16_t rx_queue_id, > > > > return -EINVAL; > > > > } > > > > > > > > + if (dev->data->dev_started && > > > > + !(dev_info.deferred_queue_config_capa & > > > > + DEV_DEFERRED_RX_QUEUE_SETUP)) > > > > + return -EINVAL; > > > > + > > > > > > I think now you have to check here that the queue is stopped. > > > Otherwise you might attempt to reconfigure running queue. > > > > I'm not sure if it's necessary to let application use different API seq= uence > for a deferred configure and deferred re-configure. > > Can we just call dev_ops->rx_queue_stop before rx_queue_release here >=20 > I don't follow you here. > Let say now inside queue_start() we do check: >=20 > if (dev->data->rx_queue_state[rx_queue_id] !=3D > RTE_ETH_QUEUE_STATE_STOPPED) >=20 > Right now it is not possible to call queue_setup() without dev_stop() bef= ore > it - that's why we have check if (dev->data->dev_started) in queue_setup(= ) > right now. > Though with your patch it not the case anymore - user is able to call > queue_setup() without stopping the whole device. > But he still has to stop the queue. >=20 > > > > > > > > > > > > rxq =3D dev->data->rx_queues; > > > > if (rxq[rx_queue_id]) { > > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_release, > > > > -ENOTSUP); > > > > > > I don't think it is *that* straightforward. > > > rx_queue_setup() parameters can imply different rx function (and > > > related dev > > > icesettings) that are already setuped by previous > queue_setup()/dev_start. > > > So I think you need to do one of 2 things: > > > 1. rework ethdev layer to introduce a separate rx function (and > > > related > > > settings) for each queue. > > > 2. at rx_queue_setup() if it is invoked after dev_start - check that > > > given queue settings wouldn't contradict with current device > > > settings (rx function, etc.). > > > If they do - return an error. > > Yes, I think what we have is option 2 here, the > > dev_ops->rx_queue_setup will return fail if conflict with previous > > setting >=20 > Hmm and what makes you think that? > As I know it is not the case right now. > Let say I do: > .... > rx_queue_setup(port=3D0,queue=3D0, mp=3Dmb_size_2048); > dev_start(port=3D0); > ... > rx_queue_setup(port=3D0,queue=3D1,mp=3Dmb_size_1024); >=20 > If current rx function doesn't support multi-segs then second > rx_queue_setup() should fail. > Though I don't think that would happen with the current implementation. Why you think that would not happen? dev_ops->rx_queue_setup can fail, righ= t? I mean it's the responsibility of low level driver (i40e) to check the conf= lict with current implementation. >=20 > Same story for TX offloads, though it probably not that critical, as for = most > Intel PMDs HW TX offloads will become per port in 18.05. >=20 > As I can see you do have either of these options implemented right now - > that's the problem. >=20 > > I'm also thinking about option 1, the idea is to move per queue rx/tx > function into driver layer, so it will not break existing API. > > > > 1. driver can expose the capability like per_queue_rx or per_queue_tx > > 2. application can enable this capability by dev_config with > > rte_eth_conf 3, if per_queue_rx is not enable, nothing change, so we > > are at option 2 4. if per_queue_rx is enabled, driver will set > > rx_pkt_burst with a hook function which redirect to an function ptr in > > a per queue rx function tables ( I guess performance is impacted > > somehow, but this is the cost if you want different offload for > > different queue) >=20 > I don't think we need to overcomplicate things here. > It should be transparent to the user - user just calls queue_setup() - ba= sed on > its input parameters PMD selects a function that fits best. > Pretty much what we have right now, just possibly have an array of functi= ons > (one per queue). If we don't introduce a new capability or something like, but just take per= queue functions as default way,=20 does that mean, we need to change all drivers to adapt this? Or do you mean below? If (dev->rx_pkt_burst) /* default way */ else /* per queue function */ Regards Qi >=20 > > > > > > > > From my perspective - 1) is a better choice though it required more > > > work, and possibly ABI breakage. > > > I did some work in that direction as RFC: > > > http://dpdk.org/dev/patchwork/patch/31866/ > > > > I will learn this, thanks for the heads up. > > > > > > 2) might be also possible, but looks a bit clumsy as > > > rx_queue_setup() might now fail even with valid parameters - all > > > depends on previous queue configurations. > > > > > > Same story applies for TX. > > > > > > > > > > + if (dev->data->dev_started && > > > > + !(dev_info.deferred_queue_config_capa & > > > > + DEV_DEFERRED_RX_QUEUE_RELEASE)) > > > > + return -EINVAL; > > > > (*dev->dev_ops->rx_queue_release)(rxq[rx_queue_id]); > > > > rxq[rx_queue_id] =3D NULL; > > > > } > > > > @@ -1573,12 +1576,6 @@ rte_eth_tx_queue_setup(uint16_t port_id, > > > uint16_t tx_queue_id, > > > > return -EINVAL; > > > > } > > > > > > > > - if (dev->data->dev_started) { > > > > - RTE_PMD_DEBUG_TRACE( > > > > - "port %d must be stopped to allow configuration\n", > port_id); > > > > - return -EBUSY; > > > > - } > > > > - > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, > > > -ENOTSUP); > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_setup, > > > -ENOTSUP); > > > > > > > > @@ -1596,10 +1593,19 @@ rte_eth_tx_queue_setup(uint16_t > port_id, > > > uint16_t tx_queue_id, > > > > return -EINVAL; > > > > } > > > > > > > > + if (dev->data->dev_started && > > > > + !(dev_info.deferred_queue_config_capa & > > > > + DEV_DEFERRED_TX_QUEUE_SETUP)) > > > > + return -EINVAL; > > > > + > > > > txq =3D dev->data->tx_queues; > > > > if (txq[tx_queue_id]) { > > > > > RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->tx_queue_release, > > > > -ENOTSUP); > > > > + if (dev->data->dev_started && > > > > + !(dev_info.deferred_queue_config_capa & > > > > + DEV_DEFERRED_TX_QUEUE_RELEASE)) > > > > + return -EINVAL; > > > > (*dev->dev_ops->tx_queue_release)(txq[tx_queue_id]); > > > > txq[tx_queue_id] =3D NULL; > > > > } > > > > diff --git a/lib/librte_ether/rte_ethdev.h > > > > b/lib/librte_ether/rte_ethdev.h index 036153306..410e58c50 100644 > > > > --- a/lib/librte_ether/rte_ethdev.h > > > > +++ b/lib/librte_ether/rte_ethdev.h > > > > @@ -981,6 +981,15 @@ struct rte_eth_conf { > > > > */ > > > > #define DEV_TX_OFFLOAD_SECURITY 0x00020000 > > > > > > > > +#define DEV_DEFERRED_RX_QUEUE_SETUP 0x00000001 /**< > Deferred > > > setup rx > > > > +queue */ #define DEV_DEFERRED_TX_QUEUE_SETUP 0x00000002 > /**< > > > Deferred > > > > +setup tx queue */ #define DEV_DEFERRED_RX_QUEUE_RELEASE > > > 0x00000004 > > > > +/**< Deferred release rx queue */ #define > > > > +DEV_DEFERRED_TX_QUEUE_RELEASE 0x00000008 /**< Deferred > release > > > tx > > > > +queue */ > > > > + > > > > > > I don't think we do need flags for both setup a and release. > > > If runtime setup is supported - surely dynamic release should be > > > supported too. > > > Also probably RUNTIME_RX_QUEUE_SETUP sounds a bit better. > > > > Agree > > > > Thanks > > Qi > > > > > > > > Konstantin > > > > > > > /* > > > > * If new Tx offload capabilities are defined, they also must be > > > > * mentioned in rte_tx_offload_names in rte_ethdev.c file. > > > > @@ -1029,6 +1038,8 @@ struct rte_eth_dev_info { > > > > /** Configured number of rx/tx queues */ > > > > uint16_t nb_rx_queues; /**< Number of RX queues. */ > > > > uint16_t nb_tx_queues; /**< Number of TX queues. */ > > > > + uint64_t deferred_queue_config_capa; > > > > + /**< queues can be setup/release after dev_start > > > > +(DEV_DEFERRED_). */ > > > > }; > > > > > > > > /** > > > > -- > > > > 2.13.6