Re: [PATCH 1/3] net/ixgbe: remove dependence on Tx queue flags

["Zhang, Qi Z" <qi.z.zhang@intel.com>]

> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Thursday, May 3, 2018 9:49 AM
> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Yigit, Ferruh
> <ferruh.yigit@intel.com>
> Cc: Dai, Wei <wei.dai@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>;
> Wang, Xiao W <xiao.w.wang@intel.com>; dev@dpdk.org
> Subject: RE: [PATCH 1/3] net/ixgbe: remove dependence on Tx queue flags
> 
> Hi Konstantin:
> 
> > -----Original Message-----
> > From: Ananyev, Konstantin
> > Sent: Wednesday, May 2, 2018 7:23 PM
> > To: Zhang, Qi Z <qi.z.zhang@intel.com>; Yigit, Ferruh
> > <ferruh.yigit@intel.com>
> > Cc: Dai, Wei <wei.dai@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>;
> > Wang, Xiao W <xiao.w.wang@intel.com>; dev@dpdk.org
> > Subject: RE: [PATCH 1/3] net/ixgbe: remove dependence on Tx queue
> > flags
> >
> >
> >
> > > -----Original Message-----
> > > From: Zhang, Qi Z
> > > Sent: Wednesday, May 2, 2018 4:16 AM
> > > To: Yigit, Ferruh <ferruh.yigit@intel.com>
> > > Cc: Dai, Wei <wei.dai@intel.com>; Lu, Wenzhuo
> > > <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> > > <konstantin.ananyev@intel.com>; Wang, Xiao W
> > > <xiao.w.wang@intel.com>; dev@dpdk.org; Zhang, Qi Z
> > > <qi.z.zhang@intel.com>
> > > Subject: [PATCH 1/3] net/ixgbe: remove dependence on Tx queue flags
> > >
> > > Since we move to new offload APIs, txq_flags is no long needed.
> > > This patch remove the dependence on that.
> > >
> > > Fixes: 51215925a32f ("net/ixgbe: convert to new Tx offloads API")
> > >
> > > Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> > > ---
> > >  drivers/net/ixgbe/ixgbe_ethdev.c | 6 ------
> > >  drivers/net/ixgbe/ixgbe_rxtx.c   | 2 --
> > >  drivers/net/ixgbe/ixgbe_rxtx.h   | 1 -
> > >  3 files changed, 9 deletions(-)
> > >
> > > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
> > > b/drivers/net/ixgbe/ixgbe_ethdev.c
> > > index 6088c7e48..709251fbb 100644
> > > --- a/drivers/net/ixgbe/ixgbe_ethdev.c
> > > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
> > > @@ -3727,9 +3727,6 @@ ixgbe_dev_info_get(struct rte_eth_dev *dev,
> > struct rte_eth_dev_info *dev_info)
> > >  		},
> > >  		.tx_free_thresh = IXGBE_DEFAULT_TX_FREE_THRESH,
> > >  		.tx_rs_thresh = IXGBE_DEFAULT_TX_RSBIT_THRESH,
> > > -		.txq_flags = ETH_TXQ_FLAGS_NOMULTSEGS |
> > > -			     ETH_TXQ_FLAGS_NOOFFLOADS |
> > > -			     ETH_TXQ_FLAGS_IGNORE,
> > >  		.offloads = 0,
> > >  	};
> >
> >
> > But old apps still use txq_flags returned by dev_info_get.
> > Removing it right now will mean this value will be undefined.
> 
> My understanding is PMD should not be aware of txq_flags anymore.
> and ethdev layer is the place to responsible for the conversion if we think it still
> necessary to support txq_flags for old applicaiton
> 
> But I got your point, there is something missing if we only have the PMD patch,
> so I'd like to hold this until ethdev layer is ready and I think this will not block
> https://dpdk.org/ml/archives/dev/2018-May/099864.html since txq_flags is
> not be involved to any decision already.

I've submitted the patch for the conversion in ethdev.
https://dpdk.org/dev/patchwork/patch/39277/

 
> 
> Regards
> Qi
> 
> >
> > >
> > > @@ -3835,9 +3832,6 @@ ixgbevf_dev_info_get(struct rte_eth_dev *dev,
> > >  		},
> > >  		.tx_free_thresh = IXGBE_DEFAULT_TX_FREE_THRESH,
> > >  		.tx_rs_thresh = IXGBE_DEFAULT_TX_RSBIT_THRESH,
> > > -		.txq_flags = ETH_TXQ_FLAGS_NOMULTSEGS |
> > > -			     ETH_TXQ_FLAGS_NOOFFLOADS |
> > > -			     ETH_TXQ_FLAGS_IGNORE,
> > >  		.offloads = 0,
> > >  	};
> > >
> > > diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c
> > > b/drivers/net/ixgbe/ixgbe_rxtx.c index 2892436e9..47045ddd0 100644
> > > --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> > > +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> > > @@ -2620,7 +2620,6 @@ ixgbe_dev_tx_queue_setup(struct rte_eth_dev
> > *dev,
> > >  	txq->reg_idx = (uint16_t)((RTE_ETH_DEV_SRIOV(dev).active == 0) ?
> > >  		queue_idx : RTE_ETH_DEV_SRIOV(dev).def_pool_q_idx +
> > queue_idx);
> > >  	txq->port_id = dev->data->port_id;
> > > -	txq->txq_flags = tx_conf->txq_flags;
> > >  	txq->offloads = tx_conf->offloads;
> > >  	txq->ops = &def_txq_ops;
> > >  	txq->tx_deferred_start = tx_conf->tx_deferred_start; @@ -5441,7
> > > +5440,6 @@ ixgbe_txq_info_get(struct rte_eth_dev *dev, uint16_t
> > > queue_id,
> > >
> > >  	qinfo->conf.tx_free_thresh = txq->tx_free_thresh;
> > >  	qinfo->conf.tx_rs_thresh = txq->tx_rs_thresh;
> > > -	qinfo->conf.txq_flags = txq->txq_flags;
> >
> >
> > Same here - old apps can still use it.
> > Ideally we'll have to fill it based on txq->offloads value.
> > Konstantin
> >
> > >  	qinfo->conf.offloads = txq->offloads;
> > >  	qinfo->conf.tx_deferred_start = txq->tx_deferred_start;  } diff
> > > --git a/drivers/net/ixgbe/ixgbe_rxtx.h
> > > b/drivers/net/ixgbe/ixgbe_rxtx.h index 7dbbbe5b3..20ef7b6ff 100644
> > > --- a/drivers/net/ixgbe/ixgbe_rxtx.h
> > > +++ b/drivers/net/ixgbe/ixgbe_rxtx.h
> > > @@ -222,7 +222,6 @@ struct ixgbe_tx_queue {
> > >  	uint8_t             pthresh;       /**< Prefetch threshold
> register.
> > */
> > >  	uint8_t             hthresh;       /**< Host threshold register.
> */
> > >  	uint8_t             wthresh;       /**< Write-back threshold
> reg.
> > */
> > > -	uint32_t txq_flags; /**< Holds flags for this TXq */
> > >  	uint64_t offloads; /**< Tx offload flags of DEV_TX_OFFLOAD_* */
> > >  	uint32_t            ctx_curr;      /**< Hardware context states.
> */
> > >  	/** Hardware context0 history. */
> > > --
> > > 2.13.6