i40e/i40evf: add VIRTCHNL_VF_OFFLOAD flag

Add virtual channel offload capability to support RX polling mode in the
VF.

Change-ID: Ib643ae2a7506dfc75fc489fc207493fabefa4832
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_register.h

@@ -873,6 +873,13 @@
 #define I40E_PFINT_CEQCTL_CAUSE_ENA_MASK I40E_MASK(0x1, I40E_PFINT_CEQCTL_CAUSE_ENA_SHIFT)
 #define I40E_PFINT_CEQCTL_INTEVENT_SHIFT 31
 #define I40E_PFINT_CEQCTL_INTEVENT_MASK I40E_MASK(0x1, I40E_PFINT_CEQCTL_INTEVENT_SHIFT)
+#define I40E_GLINT_CTL 0x0003F800 /* Reset: CORER */
+#define I40E_GLINT_CTL_DIS_AUTOMASK_PF0_SHIFT 0
+#define I40E_GLINT_CTL_DIS_AUTOMASK_PF0_MASK I40E_MASK(0x1, I40E_GLINT_CTL_DIS_AUTOMASK_PF0_SHIFT)
+#define I40E_GLINT_CTL_DIS_AUTOMASK_VF0_SHIFT 1
+#define I40E_GLINT_CTL_DIS_AUTOMASK_VF0_MASK I40E_MASK(0x1, I40E_GLINT_CTL_DIS_AUTOMASK_VF0_SHIFT)
+#define I40E_GLINT_CTL_DIS_AUTOMASK_N_SHIFT 2
+#define I40E_GLINT_CTL_DIS_AUTOMASK_N_MASK I40E_MASK(0x1, I40E_GLINT_CTL_DIS_AUTOMASK_N_SHIFT)
 #define I40E_PFINT_DYN_CTL0 0x00038480 /* Reset: PFR */
 #define I40E_PFINT_DYN_CTL0_INTENA_SHIFT 0
 #define I40E_PFINT_DYN_CTL0_INTENA_MASK I40E_MASK(0x1, I40E_PFINT_DYN_CTL0_INTENA_SHIFT)

drivers/net/ethernet/intel/i40e/i40e_virtchnl.h

@@ -152,6 +152,7 @@ struct i40e_virtchnl_vsi_resource {
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_AQ		0x00000008
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_REG	0x00000010
 #define I40E_VIRTCHNL_VF_OFFLOAD_VLAN		0x00010000
+#define I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING	0x00020000
 
 struct i40e_virtchnl_vf_resource {
 	u16 num_vsis;

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -335,6 +335,18 @@ static void i40e_config_irq_link_list(struct i40e_vf *vf, u16 vsi_id,
 		wr32(hw, reg_idx, reg);
 	}
 
+	/* if the vf is running in polling mode and using interrupt zero,
+	 * need to disable auto-mask on enabling zero interrupt for VFs.
+	 */
+	if ((vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING) &&
+	    (vector_id == 0)) {
+		reg = rd32(hw, I40E_GLINT_CTL);
+		if (!(reg & I40E_GLINT_CTL_DIS_AUTOMASK_VF0_MASK)) {
+			reg |= I40E_GLINT_CTL_DIS_AUTOMASK_VF0_MASK;
+			wr32(hw, I40E_GLINT_CTL, reg);
+		}
+	}
+
 irq_list_done:
 	i40e_flush(hw);
 }

drivers/net/ethernet/intel/i40evf/i40e_virtchnl.h

@@ -152,6 +152,7 @@ struct i40e_virtchnl_vsi_resource {
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_AQ		0x00000008
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_REG	0x00000010
 #define I40E_VIRTCHNL_VF_OFFLOAD_VLAN		0x00010000
+#define I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING	0x00020000
 
 struct i40e_virtchnl_vf_resource {
 	u16 num_vsis;