[Intel-wired-lan] [net-next 06/10] fm10k: send traffic on default vid to vlan device if we have one

[Alexander Duyck <alexander.duyck@gmail.com>]

On 06/19/2015 04:37 PM, Jacob Keller wrote:
> This patch ensures that vlan traffic on the default vid will go to the
> corresponding vlan device if it exists. To do this, mask the rx_ring vid
> if we have an active vlan on that vid.
>
> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
> ---
>   drivers/net/ethernet/intel/fm10k/fm10k_netdev.c | 12 ++++++++++++
>   drivers/net/ethernet/intel/fm10k/fm10k_pci.c    |  4 ++++
>   2 files changed, 16 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
> index e1ceb3a2e2cd..c173c79373fe 100644
> --- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
> +++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
> @@ -758,6 +758,7 @@ static int fm10k_update_vid(struct net_device *netdev, u16 vid, bool set)
>   	struct fm10k_intfc *interface = netdev_priv(netdev);
>   	struct fm10k_hw *hw = &interface->hw;
>   	s32 err;
> +	int i;
>
>   	/* updates do not apply to VLAN 0 */
>   	if (!vid)
> @@ -775,6 +776,17 @@ static int fm10k_update_vid(struct net_device *netdev, u16 vid, bool set)
>   	if (!set)
>   		clear_bit(vid, interface->active_vlans);
>
> +	/* disable the default vid on ring if we have an active vlan */
> +	for (i = 0; i < interface->num_rx_queues; i++) {
> +		struct fm10k_ring *rx_ring = interface->rx_ring[i];
> +		u16 rx_vid = rx_ring->vid & (VLAN_N_VID - 1);
> +
> +		if (test_bit(rx_vid, interface->active_vlans))
> +			rx_ring->vid |= FM10K_VLAN_CLEAR;
> +		else
> +			rx_ring->vid &= ~FM10K_VLAN_CLEAR;
> +	}
> +
>   	/* Do not remove default VID related entries from VLAN and MAC tables */
>   	if (!set && vid == hw->mac.default_vid)
>   		return 0;
> diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
> index 6d1364393a8b..989981ea3c64 100644
> --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
> +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
> @@ -694,6 +694,10 @@ static void fm10k_configure_rx_ring(struct fm10k_intfc *interface,
>   	/* assign default VLAN to queue */
>   	ring->vid = hw->mac.default_vid;
>
> +	/* if we have an active VLAN, disable default vid */
> +	if (test_bit(hw->mac.default_vid, interface->active_vlans))
> +		ring->vid |= FM10K_VLAN_CLEAR;
> +
>   	/* Map interrupt */
>   	if (ring->q_vector) {
>   		rxint = ring->q_vector->v_idx + NON_Q_VECTORS(hw);
>

This doesn't quite work since the rx_ring->vid is doing a full 16b 
comparison against a value that includes the QOS value.

I just realized that is a bug in the fm10k_process_skb_fields function. 
  You probably need to update it so that code does something more like

if (rx_desc->w.vlan) {
	u16 vid = le16_to_cpu(rx_desc->w.vlan);

	if ((vid & VLAN_VID_MASK) != rx_ring->vid)
		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
	else if (vid & VLAN_PRIO_MASK)
		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
				       vid & VLAN_PRIO_MASK);
}