ice: implement bridge port vlan

Port VLAN in this case means push and pop VLAN action on specific vid.
There are a few limitation in hardware:
- push and pop can't be used separately
- if port VLAN is used there can't be any trunk VLANs, because pop
  action is done on all traffic received by VSI in port VLAN mode
- port VLAN mode on uplink port isn't supported

Reflect these limitations in code using dev_info to inform the user
about unsupported configuration.

In bridge mode there is a need to configure port vlan without resetting
VFs. To do that implement ice_port_vlan_on/off() functions. They are
only configuring correct vlan_ops to allow setting port vlan.

We also need to clear port vlan without resetting the VF which is not
supported right now. Change it by implementing clear_port_vlan ops.
As previous VLAN configuration isn't always the same, store current
config while creating port vlan and restore it in clear function.

Configuration steps:
- configure switchdev with bridge
- #bridge vlan add dev eth0 vid 120 pvid untagged
- #bridge vlan add dev eth1 vid 120 pvid untagged
- ping from VF0 to VF1

Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 81 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
index 5b4a0abb4607..76266e709a39 100644
--- a/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_vsi_vlan_lib.c
@@ -202,6 +202,24 @@ int ice_vsi_dis_inner_insertion(struct ice_vsi *vsi)
 	return ice_vsi_manage_vlan_insertion(vsi);
 }
 
+static void
+ice_save_vlan_info(struct ice_aqc_vsi_props *info,
+		   struct ice_vsi_vlan_info *vlan)
+{
+	vlan->sw_flags2 = info->sw_flags2;
+	vlan->inner_vlan_flags = info->inner_vlan_flags;
+	vlan->outer_vlan_flags = info->outer_vlan_flags;
+}
+
+static void
+ice_restore_vlan_info(struct ice_aqc_vsi_props *info,
+		      struct ice_vsi_vlan_info *vlan)
+{
+	info->sw_flags2 = vlan->sw_flags2;
+	info->inner_vlan_flags = vlan->inner_vlan_flags;
+	info->outer_vlan_flags = vlan->outer_vlan_flags;
+}
+
 /**
  * __ice_vsi_set_inner_port_vlan - set port VLAN VSI context settings to enable a port VLAN
  * @vsi: the VSI to update
@@ -218,6 +236,7 @@ static int __ice_vsi_set_inner_port_vlan(struct ice_vsi *vsi, u16 pvid_info)
 	if (!ctxt)
 		return -ENOMEM;
 
+	ice_save_vlan_info(&vsi->info, &vsi->vlan_info);
 	ctxt->info = vsi->info;
 	info = &ctxt->info;
 	info->inner_vlan_flags = ICE_AQ_VSI_INNER_VLAN_TX_MODE_ACCEPTUNTAGGED |
@@ -259,6 +278,33 @@ int ice_vsi_set_inner_port_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan)
 	return __ice_vsi_set_inner_port_vlan(vsi, port_vlan_info);
 }
 
+int ice_vsi_clear_inner_port_vlan(struct ice_vsi *vsi)
+{
+	struct ice_hw *hw = &vsi->back->hw;
+	struct ice_aqc_vsi_props *info;
+	struct ice_vsi_ctx *ctxt;
+	int ret;
+
+	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
+	if (!ctxt)
+		return -ENOMEM;
+
+	ice_restore_vlan_info(&vsi->info, &vsi->vlan_info);
+	vsi->info.port_based_inner_vlan = 0;
+	ctxt->info = vsi->info;
+	info = &ctxt->info;
+	info->valid_sections = cpu_to_le16(ICE_AQ_VSI_PROP_VLAN_VALID |
+					   ICE_AQ_VSI_PROP_SW_VALID);
+
+	ret = ice_update_vsi(hw, vsi->idx, ctxt, NULL);
+	if (ret)
+		dev_err(ice_hw_to_dev(hw), "update VSI for port VLAN failed, err %d aq_err %s\n",
+			ret, ice_aq_str(hw->adminq.sq_last_status));
+
+	kfree(ctxt);
+	return ret;
+}
+
 /**
  * ice_cfg_vlan_pruning - enable or disable VLAN pruning on the VSI
  * @vsi: VSI to enable or disable VLAN pruning on
@@ -647,6 +693,7 @@ __ice_vsi_set_outer_port_vlan(struct ice_vsi *vsi, u16 vlan_info, u16 tpid)
 	if (!ctxt)
 		return -ENOMEM;
 
+	ice_save_vlan_info(&vsi->info, &vsi->vlan_info);
 	ctxt->info = vsi->info;
 
 	ctxt->info.sw_flags2 |= ICE_AQ_VSI_SW_FLAG_RX_VLAN_PRUNE_ENA;
@@ -689,9 +736,6 @@ __ice_vsi_set_outer_port_vlan(struct ice_vsi *vsi, u16 vlan_info, u16 tpid)
  * used if DVM is supported. Also, this function should never be called directly
  * as it should be part of ice_vsi_vlan_ops if it's needed.
  *
- * This function does not support clearing the port VLAN as there is currently
- * no use case for this.
- *
  * Use the ice_vlan structure passed in to set this VSI in a port VLAN.
  */
 int ice_vsi_set_outer_port_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan)
@@ -705,3 +749,37 @@ int ice_vsi_set_outer_port_vlan(struct ice_vsi *vsi, struct ice_vlan *vlan)
 
 	return __ice_vsi_set_outer_port_vlan(vsi, port_vlan_info, vlan->tpid);
 }
+
+/**
+ * ice_vsi_clear_outer_port_vlan - clear outer port vlan
+ * @vsi: VSI to configure
+ *
+ * The function is restoring previously set vlan config (saved in
+ * vsi->vlan_info). Setting happens in port vlan configuration.
+ */
+int ice_vsi_clear_outer_port_vlan(struct ice_vsi *vsi)
+{
+	struct ice_hw *hw = &vsi->back->hw;
+	struct ice_vsi_ctx *ctxt;
+	int err;
+
+	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
+	if (!ctxt)
+		return -ENOMEM;
+
+	ice_restore_vlan_info(&vsi->info, &vsi->vlan_info);
+	vsi->info.port_based_outer_vlan = 0;
+	ctxt->info = vsi->info;
+
+	ctxt->info.valid_sections =
+		cpu_to_le16(ICE_AQ_VSI_PROP_OUTER_TAG_VALID |
+			    ICE_AQ_VSI_PROP_SW_VALID);
+
+	err = ice_update_vsi(hw, vsi->idx, ctxt, NULL);
+	if (err)
+		dev_err(ice_pf_to_dev(vsi->back), "update VSI for clearing outer port based VLAN failed, err %d aq_err %s\n",
+			err, ice_aq_str(hw->adminq.sq_last_status));
+
+	kfree(ctxt);
+	return err;
+}