Re: [dpdk-dev] [v2] net/i40e: fix vf runtime queues rss config

["Xing, Beilei" <beilei.xing@intel.com>]

> -----Original Message-----
> From: Zhang, Xiao
> Sent: Friday, August 9, 2019 12:41 AM
> To: dev@dpdk.org
> Cc: Xing, Beilei <beilei.xing@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>;
> Zhang, Xiao <xiao.zhang@intel.com>; stable@dpdk.org
> Subject: [v2] net/i40e: fix vf runtime queues rss config
> 
> I40evf queue can not work properly with kernel pf driver. Eg. when configure
> 8 queues pair, only 4 queues can receive packets, and half packets will be lost
> if using 2 queues pair.
> This issue is caused by misconfiguration of look up table, use aq command to
> setup the lut to make it work properly.
> 
> Fixes: cea7a51c1750 ("i40evf: support RSS")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
> ---
> v2 change for loop format to avoid build patch issue.
> ---
>  drivers/net/i40e/i40e_ethdev_vf.c | 36 +++++++++++++++++++++++++++++---
> ----
>  1 file changed, 29 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c
> b/drivers/net/i40e/i40e_ethdev_vf.c
> index 308fb98..2d3cf3e 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -2574,6 +2574,26 @@ i40evf_hw_rss_hash_set(struct i40e_vf *vf, struct
> rte_eth_rss_conf *rss_conf)
>  	if (ret)
>  		return ret;
> 
> +	if (vf->flags & I40E_FLAG_RSS_AQ_CAPABLE) {
> +		uint8_t *lut;
> +		uint32_t rss_lut_size = (I40E_VFQF_HLUT1_MAX_INDEX + 1) *
> 4;
> +		uint32_t i;
> +		lut = rte_zmalloc("i40e_rss_lut", rss_lut_size, 0);
> +		if (!lut) {
> +			PMD_DRV_LOG(ERR, "No memory can be allocated");
> +			return -ENOMEM;
> +		}
> +
> +		for (i = 0; i < rss_lut_size; i++)
> +			lut[i] = i % vf->num_queue_pairs;
> +
> +		ret = i40evf_set_rss_lut(&vf->vsi, lut,
> +					 rss_lut_size);
> +		rte_free(lut);
> +		if (ret)
> +			return ret;
> +	}
> +

Why not moving the LUT configuration to the following i40evf_config_rss function?

>  	hena = i40e_config_hena(vf->adapter, rss_conf->rss_hf);
>  	i40e_write_rx_ctl(hw, I40E_VFQF_HENA(0), (uint32_t)hena);
>  	i40e_write_rx_ctl(hw, I40E_VFQF_HENA(1), (uint32_t)(hena >> 32));
> @@ -2607,13 +2627,15 @@ i40evf_config_rss(struct i40e_vf *vf)
>  	}
> 
>  	num = RTE_MIN(vf->dev_data->nb_rx_queues,
> I40E_MAX_QP_NUM_PER_VF);
> -	/* Fill out the look up table */
> -	for (i = 0, j = 0; i < nb_q; i++, j++) {
> -		if (j >= num)
> -			j = 0;
> -		lut = (lut << 8) | j;
> -		if ((i & 3) == 3)
> -			I40E_WRITE_REG(hw, I40E_VFQF_HLUT(i >> 2), lut);
> +	if (!(vf->flags & I40E_FLAG_RSS_AQ_CAPABLE)) {
> +		/* Fill out the look up table */
> +		for (i = 0, j = 0; i < nb_q; i++, j++) {
> +			if (j >= num)
> +				j = 0;
> +			lut = (lut << 8) | j;
> +			if ((i & 3) == 3)
> +				I40E_WRITE_REG(hw, I40E_VFQF_HLUT(i >>
> 2), lut);
> +		}
>  	}
> 
>  	rss_conf = vf->dev_data->dev_conf.rx_adv_conf.rss_conf;
> --
> 2.7.4