[Intel-wired-lan] [PATCH] i40e: Fix virtchnl_queue_select bitmap validation

[Bowers, AndrewX <andrewx.bowers@intel.com>]

Comments inline

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at osuosl.org] On
> Behalf Of Jeff Kirsher
> Sent: Wednesday, November 13, 2019 11:28 AM
> To: intel-wired-lan at lists.osuosl.org
> Cc: Creeley, Brett <brett.creeley@intel.com>; Arkady Gilinksky
> <arkady.gilinsky@harmonicinc.com>
> Subject: [Intel-wired-lan] [PATCH] i40e: Fix virtchnl_queue_select bitmap
> validation
> 
> From: Brett Creeley <brett.creeley@intel.com>
> 
> Currently in i40e_vc_disable_queues_msg() we are incorrectly validating the
> virtchnl queue select bitmaps. The virtchnl_queue_select rx_queues and
> tx_queue bitmap is being compared against ICE_MAX_VF_QUEUES, but the
> problem is that these bitmaps can have a value greater than
> I40E_MAX_VF_QUEUES.
> Fix this by comparing the bitmaps against BIT(I40E_MAX_VF_QUEUES).
> 
> Also, add the function i40e_vc_validate_vqs_bitmaps() that checks to see if
> both virtchnl_queue_select bitmaps are empty along with checking that the
> bitmaps only have valid bits set. This function can then be used in both the
> queue enable and disable flows.
> 
> Suggested-by: Arkady Gilinksky <arkady.gilinsky@harmonicinc.com>
> Signed-off-by: Brett Creeley <brett.creeley@intel.com>
> ---
>  .../ethernet/intel/i40e/i40e_virtchnl_pf.c    | 22 +++++++++++++++----
>  1 file changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index 6d75a35acb67..275702d8cf7a 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -2321,6 +2321,22 @@ static int i40e_ctrl_vf_rx_rings(struct i40e_vsi *vsi,
> unsigned long q_map,
>  	return ret;
>  }
> 
> +/**
> + * i40e_vc_validate_vqs_bitmaps - validate Rx/Tx queue bitmaps from
> +VIRTHCHNL
> + * @vqs: virtchnl_queue_select structure containing bitmaps to validate
> + *
> + * Returns true if validation was successful, else false.
> + */
> +static bool i40e_vc_validate_vqs_bitmaps(struct virtchnl_queue_select
> +*vqs) {
> +	if ((!vqs->rx_queues && !vqs->tx_queues) ||
> +	    vqs->rx_queue >= BIT(I40E_MAX_VF_QUEUES) ||
> +	    vqs->tx_queue >= BIT(I40E_MAX_VF_QUEUES))

Should these not be "rx_queues" and "tx_queues"? 

> +	       return false;
> +
> +	return true;
> +}
> +
>  /**
>   * i40e_vc_enable_queues_msg
>   * @vf: pointer to the VF info
> @@ -2346,7 +2362,7 @@ static int i40e_vc_enable_queues_msg(struct
> i40e_vf *vf, u8 *msg)
>  		goto error_param;
>  	}
> 
> -	if ((0 == vqs->rx_queues) && (0 == vqs->tx_queues)) {
> +	if (i40e_vc_validate_vqs_bitmaps(vqs)) {
>  		aq_ret = I40E_ERR_PARAM;
>  		goto error_param;
>  	}
> @@ -2408,9 +2424,7 @@ static int i40e_vc_disable_queues_msg(struct
> i40e_vf *vf, u8 *msg)
>  		goto error_param;
>  	}
> 
> -	if ((vqs->rx_queues == 0 && vqs->tx_queues == 0) ||
> -	    vqs->rx_queues > I40E_MAX_VF_QUEUES ||
> -	    vqs->tx_queues > I40E_MAX_VF_QUEUES) {
> +	if (i40e_vc_validate_vqs_bitmaps(vqs)) {
>  		aq_ret = I40E_ERR_PARAM;
>  		goto error_param;
>  	}
> --
> 2.23.0
> 
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