[PATCH 5.18 27/88] ice: Fix max VLANs available for VF

Greg Kroah-Hartman
2022-08-01T12:13:09Z

From: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>

commit 1e308c6fb7127371f48a0fb9770ea0b30a6b5698 upstream.

Legacy VLAN implementation allows for untrusted VF to have 8 VLAN
filters, not counting VLAN 0 filters. Current VLAN_V2 implementation
lowers available filters for VF, by counting in VLAN 0 filter for both
TPIDs.
Fix this by counting only non zero VLAN filters.
Without this patch, untrusted VF would not be able to access 8 VLAN
filters.

Fixes: cc71de8fa133 ("ice: Add support for VIRTCHNL_VF_OFFLOAD_VLAN_V2")
Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Marek Szlosek <marek.szlosek@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/intel/ice/ice_virtchnl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
@@ -2966,7 +2966,8 @@ ice_vc_validate_add_vlan_filter_list(str
struct virtchnl_vlan_filtering_caps *vfc,
struct virtchnl_vlan_filter_list_v2 *vfl)
{
- u16 num_requested_filters = vsi->num_vlan + vfl->num_elements;
+ u16 num_requested_filters = ice_vsi_num_non_zero_vlans(vsi) +
+ vfl->num_elements;

if (num_requested_filters > vfc->max_filters)
return false;