Re: [dpdk-dev] [PATCH V5] ethdev: add queue state when retrieve queue information

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Kinsella, Ray
> Sent: Friday, April 23, 2021 12:17 PM
> To: Lijun Ou <oulijun@huawei.com>; thomas@monjalon.net; Yigit, Ferruh <ferruh.yigit@intel.com>
> Cc: dev@dpdk.org; linuxarm@openeuler.org
> Subject: Re: [dpdk-dev] [PATCH V5] ethdev: add queue state when retrieve queue information
> 
> 
> 
> On 17/04/2021 04:09, Lijun Ou wrote:
> > Currently, upper-layer application could get queue state only
> > through pointers such as dev->data->tx_queue_state[queue_id],
> > this is not the recommended way to access it. So this patch
> > add get queue state when call rte_eth_rx_queue_info_get and
> > rte_eth_tx_queue_info_get API.
> >
> > Note: After add queue_state field, the 'struct rte_eth_rxq_info' size
> > remains 128B, and the 'struct rte_eth_txq_info' size remains 64B, so
> > it could be ABI compatible.
> >
> > Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> > Signed-off-by: Lijun Ou <oulijun@huawei.com>
> > Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> > ---
> > V4->V5:
> > - Add acked-by
> > - add a note to the "New features" section to annouce the new feature.
> >
> > V3->V4:
> > - update libabigail.abignore for removing the CI warnings
> >
> > V2->V3:
> > - rewrite the commit log and delete the part Note
> > - rewrite tht comments for queue state
> > - move the queue_state definition locations
> >
> > V1->V2:
> > - move queue state defines to public file
> > ---
> >  doc/guides/rel_notes/release_21_05.rst | 6 ++++++
> >  lib/librte_ethdev/ethdev_driver.h      | 7 -------
> >  lib/librte_ethdev/rte_ethdev.c         | 3 +++
> >  lib/librte_ethdev/rte_ethdev.h         | 9 +++++++++
> >  4 files changed, 18 insertions(+), 7 deletions(-)
> >
> > diff --git a/doc/guides/rel_notes/release_21_05.rst b/doc/guides/rel_notes/release_21_05.rst
> > index 58272e1..1ab3681 100644
> > --- a/doc/guides/rel_notes/release_21_05.rst
> > +++ b/doc/guides/rel_notes/release_21_05.rst
> > @@ -81,6 +81,12 @@ New Features
> >        representor=[[c#]pf#]sf# sf[0,2-1023] /* 1023 SFs.                     */
> >        representor=[c#]pf#      c2pf[0,1]    /* 2 PFs on controller 2.        */
> >
> > +* **Enhanced function for getting rxq/txq info ABI.**
> > +  * Added new field ``queue_state`` to ``rte_eth_rxq_info`` structure to
> > +    provide indicated rxq queue state.
> > +  * Added new field ``queue_state`` to ``rte_eth_txq_info`` structure to
> > +    provide indicated txq queue state.
> > +
> >  * **Added support for meter PPS profile.**
> >
> >    Currently meter algorithms only supports bytes per second(BPS).
> > diff --git a/lib/librte_ethdev/ethdev_driver.h b/lib/librte_ethdev/ethdev_driver.h
> > index 113129d..40e474a 100644
> > --- a/lib/librte_ethdev/ethdev_driver.h
> > +++ b/lib/librte_ethdev/ethdev_driver.h
> > @@ -952,13 +952,6 @@ struct eth_dev_ops {
> >  };
> >
> >  /**
> > - * RX/TX queue states
> > - */
> > -#define RTE_ETH_QUEUE_STATE_STOPPED 0
> > -#define RTE_ETH_QUEUE_STATE_STARTED 1
> > -#define RTE_ETH_QUEUE_STATE_HAIRPIN 2
> > -
> > -/**
> >   * @internal
> >   * Check if the selected Rx queue is hairpin queue.
> >   *
> > diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> > index c73d263..d5adf4f 100644
> > --- a/lib/librte_ethdev/rte_ethdev.c
> > +++ b/lib/librte_ethdev/rte_ethdev.c
> > @@ -5038,6 +5038,8 @@ rte_eth_rx_queue_info_get(uint16_t port_id, uint16_t queue_id,
> >
> >  	memset(qinfo, 0, sizeof(*qinfo));
> >  	dev->dev_ops->rxq_info_get(dev, queue_id, qinfo);
> > +	qinfo->queue_state = dev->data->rx_queue_state[queue_id];
> > +
> >  	return 0;
> >  }
> >
> > @@ -5078,6 +5080,7 @@ rte_eth_tx_queue_info_get(uint16_t port_id, uint16_t queue_id,
> >
> >  	memset(qinfo, 0, sizeof(*qinfo));
> >  	dev->dev_ops->txq_info_get(dev, queue_id, qinfo);
> > +	qinfo->queue_state = dev->data->tx_queue_state[queue_id];
> >
> >  	return 0;
> >  }
> > diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> > index 3b773b6..a0d01d2 100644
> > --- a/lib/librte_ethdev/rte_ethdev.h
> > +++ b/lib/librte_ethdev/rte_ethdev.h
> > @@ -1588,6 +1588,13 @@ struct rte_eth_dev_info {
> >  };
> >
> >  /**
> > + * RX/TX queue states
> > + */
> > +#define RTE_ETH_QUEUE_STATE_STOPPED 0
> > +#define RTE_ETH_QUEUE_STATE_STARTED 1
> > +#define RTE_ETH_QUEUE_STATE_HAIRPIN 2
> > +
> > +/**
> >   * Ethernet device RX queue information structure.
> >   * Used to retrieve information about configured queue.
> >   */
> > @@ -1595,6 +1602,7 @@ struct rte_eth_rxq_info {
> >  	struct rte_mempool *mp;     /**< mempool used by that queue. */
> >  	struct rte_eth_rxconf conf; /**< queue config parameters. */
> >  	uint8_t scattered_rx;       /**< scattered packets RX supported. */
> > +	uint8_t queue_state;        /**< one of RTE_ETH_QUEUE_STATE_*. */
> 
> Are we sure this is a false positive? - it is being added mid-structure on the rx-side at least.
> Shouldn't this be appended to the end - unless it is being sneaked into padding between fields.

I believe there was a padding, that's why it was suggested to squeeze it here.

> 
> >  	uint16_t nb_desc;           /**< configured number of RXDs. */
> >  	uint16_t rx_buf_size;       /**< hardware receive buffer size. */
> >  } __rte_cache_min_aligned;
> > @@ -1606,6 +1614,7 @@ struct rte_eth_rxq_info {
> >  struct rte_eth_txq_info {
> >  	struct rte_eth_txconf conf; /**< queue config parameters. */
> >  	uint16_t nb_desc;           /**< configured number of TXDs. */
> > +	uint8_t queue_state;        /**< one of RTE_ETH_QUEUE_STATE_*. */
> >  } __rte_cache_min_aligned;
> >
> >  /* Generic Burst mode flag definition, values can be ORed. */
> >