[dpdk-dev] net/i40e: fix incorrect var assignment

  rx/tx_queue_setup functions are shared between PF and VF
drivers. So the var 'pf' should not be assigned at the beginning.
This patch fixes the issue, and also corrects the return err code.

Cc: stable@dpdk.org
Fixes: b6583ee40265 ("i40e: full VMDQ pools support")

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
---
 drivers/net/i40e/i40e_rxtx.c | 72 +++++++++++++++++++++++---------------------
 1 file changed, 37 insertions(+), 35 deletions(-)
  

> -----Original Message-----
> From: Wu, Jingjing
> Sent: Thursday, September 14, 2017 1:31 AM
> To: Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; Wu, Jingjing <jingjing.wu@intel.com>; stable@dpdk.org
> Subject: [PATCH] net/i40e: fix incorrect var assignment
> 
> rx/tx_queue_setup functions are shared between PF and VF drivers. So the
> var 'pf' should not be assigned at the beginning.
> This patch fixes the issue, and also corrects the return err code.
> 
> Cc: stable@dpdk.org
> Fixes: b6583ee40265 ("i40e: full VMDQ pools support")
> 
> Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
> ---
>  drivers/net/i40e/i40e_rxtx.c | 72 +++++++++++++++++++++++----------------
> -----
>  1 file changed, 37 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c index
> d42c23c..232d850 100644
> --- a/drivers/net/i40e/i40e_rxtx.c
> +++ b/drivers/net/i40e/i40e_rxtx.c
> @@ -1736,34 +1736,40 @@ i40e_dev_rx_queue_setup(struct rte_eth_dev
> *dev,  {
>  	struct i40e_vsi *vsi;
>  	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> -	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> >dev_private);
> +	struct i40e_pf *pf = NULL;
>  	struct i40e_adapter *ad =
>  		I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
>  	struct i40e_rx_queue *rxq;
>  	const struct rte_memzone *rz;
>  	uint32_t ring_size;
>  	uint16_t len, i;
> -	uint16_t base, bsf, tc_mapping;
> -	int use_def_burst_func = 1;
> +	uint16_t reg_idx, base, bsf, tc_mapping;
> +	int q_offset, use_def_burst_func = 1;
> 
>  	if (hw->mac.type == I40E_MAC_VF || hw->mac.type ==
> I40E_MAC_X722_VF) {
>  		struct i40e_vf *vf =
>  			I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);

One minor comment: how about moving  variable vf to the beginning of the function to align with variable pf?

>  		vsi = &vf->vsi;
> -	} else
> +		if (!vsi)
> +			return -EINVAL;
> +		reg_idx = queue_idx;
> +	} else {
> +		pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
>  		vsi = i40e_pf_get_vsi_by_qindex(pf, queue_idx);
> -
> -	if (vsi == NULL) {
> -		PMD_DRV_LOG(ERR, "VSI not available or queue "
> -			    "index exceeds the maximum");
> -		return I40E_ERR_PARAM;
> +		if (!vsi)
> +			return -EINVAL;
> +		q_offset = i40e_get_queue_offset_by_qindex(pf,
> queue_idx);
> +		if (q_offset < 0)
> +			return -EINVAL;
> +		reg_idx = vsi->base_queue + q_offset;
>  	}
> +
>  	if (nb_desc % I40E_ALIGN_RING_DESC != 0 ||
> -			(nb_desc > I40E_MAX_RING_DESC) ||
> -			(nb_desc < I40E_MIN_RING_DESC)) {
> +	    (nb_desc > I40E_MAX_RING_DESC) ||
> +	    (nb_desc < I40E_MIN_RING_DESC)) {
>  		PMD_DRV_LOG(ERR, "Number (%u) of receive descriptors is
> "
>  			    "invalid", nb_desc);
> -		return I40E_ERR_PARAM;
> +		return -EINVAL;
>  	}
> 
>  	/* Free memory if needed */
> @@ -1786,12 +1792,7 @@ i40e_dev_rx_queue_setup(struct rte_eth_dev
> *dev,
>  	rxq->nb_rx_desc = nb_desc;
>  	rxq->rx_free_thresh = rx_conf->rx_free_thresh;
>  	rxq->queue_id = queue_idx;
> -	if (hw->mac.type == I40E_MAC_VF || hw->mac.type ==
> I40E_MAC_X722_VF)
> -		rxq->reg_idx = queue_idx;
> -	else /* PF device */
> -		rxq->reg_idx = vsi->base_queue +
> -			i40e_get_queue_offset_by_qindex(pf, queue_idx);
> -
> +	rxq->reg_idx = reg_idx;
>  	rxq->port_id = dev->data->port_id;
>  	rxq->crc_len = (uint8_t) ((dev->data-
> >dev_conf.rxmode.hw_strip_crc) ?
>  							0 : ETHER_CRC_LEN);
> @@ -2014,32 +2015,38 @@ i40e_dev_tx_queue_setup(struct rte_eth_dev
> *dev,  {
>  	struct i40e_vsi *vsi;
>  	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> -	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> >dev_private);
> +	struct i40e_pf *pf = NULL;
>  	struct i40e_tx_queue *txq;
>  	const struct rte_memzone *tz;
>  	uint32_t ring_size;
>  	uint16_t tx_rs_thresh, tx_free_thresh;
> -	uint16_t i, base, bsf, tc_mapping;
> +	uint16_t reg_idx, i, base, bsf, tc_mapping;
> +	int q_offset;
> 
>  	if (hw->mac.type == I40E_MAC_VF || hw->mac.type ==
> I40E_MAC_X722_VF) {
>  		struct i40e_vf *vf =
>  			I40EVF_DEV_PRIVATE_TO_VF(dev->data-
> >dev_private);

Same comment here.

>  		vsi = &vf->vsi;
> -	} else
> +		if (!vsi)
> +			return -EINVAL;
> +		reg_idx = queue_idx;
> +	} else {
> +		pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
>  		vsi = i40e_pf_get_vsi_by_qindex(pf, queue_idx);
> -
> -	if (vsi == NULL) {
> -		PMD_DRV_LOG(ERR, "VSI is NULL, or queue index (%u) "
> -			    "exceeds the maximum", queue_idx);
> -		return I40E_ERR_PARAM;
> +		if (!vsi)
> +			return -EINVAL;
> +		q_offset = i40e_get_queue_offset_by_qindex(pf,
> queue_idx);
> +		if (q_offset < 0)
> +			return -EINVAL;
> +		reg_idx = vsi->base_queue + q_offset;
>  	}
> 
>  	if (nb_desc % I40E_ALIGN_RING_DESC != 0 ||
> -			(nb_desc > I40E_MAX_RING_DESC) ||
> -			(nb_desc < I40E_MIN_RING_DESC)) {
> +	    (nb_desc > I40E_MAX_RING_DESC) ||
> +	    (nb_desc < I40E_MIN_RING_DESC)) {
>  		PMD_DRV_LOG(ERR, "Number (%u) of transmit descriptors
> is "
>  			    "invalid", nb_desc);
> -		return I40E_ERR_PARAM;
> +		return -EINVAL;
>  	}
> 
>  	/**
> @@ -2148,12 +2155,7 @@ i40e_dev_tx_queue_setup(struct rte_eth_dev
> *dev,
>  	txq->hthresh = tx_conf->tx_thresh.hthresh;
>  	txq->wthresh = tx_conf->tx_thresh.wthresh;
>  	txq->queue_id = queue_idx;
> -	if (hw->mac.type == I40E_MAC_VF || hw->mac.type ==
> I40E_MAC_X722_VF)
> -		txq->reg_idx = queue_idx;
> -	else /* PF device */
> -		txq->reg_idx = vsi->base_queue +
> -			i40e_get_queue_offset_by_qindex(pf, queue_idx);
> -
> +	txq->reg_idx = reg_idx;
>  	txq->port_id = dev->data->port_id;
>  	txq->txq_flags = tx_conf->txq_flags;
>  	txq->vsi = vsi;
> --
> 2.7.4