[Intel-wired-lan] [PATCH net v2] i40e: Fix incorrect netdev's real number of RX/TX queues

[Maciej Fijalkowski <maciej.fijalkowski@intel.com>]

On Wed, Dec 15, 2021 at 10:45:54AM +0000, Jedrzej Jagielski wrote:
> There was a wrong queues representation in sysfs during
> driver's reinitialization in case of online cpus number is
> less than combined queues. It was caused by stopped
> NetworkManager, which is responsible for calling vsi_open
> function during driver's initialization.
> In specific situation (ex. 12 cpus online) there were 16 queues
> in /sys/class/net/<iface>/queues. In case of modifying queues with
> value higher, than number of online cpus, then it caused write
> errors and other errors.
> Add updating of sysfs's queues representation during driver
> initialization.

Description is not very clear to me - how did you get the value of 16
queues? Do you have 16 cpu system and then modified the count of cpus
being online?

> 
> Fixes: 41c445ff0f48 ("i40e: main driver core")
> Signed-off-by: Lukasz Cieplicki <lukaszx.cieplicki@intel.com>
> Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
> ---
> v2:Fix "CHECK: Lines should not end with a '('" warning
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 4ff1c9b9217b..1b6f03cc41da 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -14074,6 +14074,22 @@ static struct i40e_vsi *i40e_vsi_reinit_setup(struct i40e_vsi *vsi)
>  	return NULL;
>  }
>  
> +/**
> + * i40e_netif_set_realnum_tx_rx_queues - Update number of tx/rx queues
> + * @vsi: vsi structure
> + *
> + * This updates netdev's number of tx/rx queues
> + *
> + * Returns status of setting tx/rx queues
> + **/
> +static int i40e_netif_set_realnum_tx_rx_queues(struct i40e_vsi *vsi)
> +{
> +	netif_set_real_num_rx_queues(vsi->netdev, vsi->num_queue_pairs);

Why return value of above is not checked?

Also would be good to convert the i40e_vsi_open() to make use of this
function you're introducing, I guess.

> +
> +	return netif_set_real_num_tx_queues(vsi->netdev,
> +					    vsi->num_queue_pairs);
> +}
> +
>  /**
>   * i40e_vsi_setup - Set up a VSI by a given type
>   * @pf: board private structure
> @@ -14203,6 +14219,9 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
>  	case I40E_VSI_MAIN:
>  	case I40E_VSI_VMDQ2:
>  		ret = i40e_config_netdev(vsi);
> +		if (ret)
> +			goto err_netdev;
> +		ret = i40e_netif_set_realnum_tx_rx_queues(vsi);
>  		if (ret)
>  			goto err_netdev;
>  		ret = register_netdev(vsi->netdev);
> -- 
> 2.27.0
> 
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