ice: Calculate guaranteed VSIs per function and use it

Currently we are setting the guar_num_vsi to equal to ICE_MAX_VSI
which is the device limit of 768. This is incorrect and could have
unintended consequences. To fix this use the valid_function's 8-bit
bitmap returned from discovering device capabilities to determine the
guar_num_vsi per function. guar_num_vsi value is then passed on to
pf->num_alloc_vsi.
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice.h

@@ -52,7 +52,6 @@ extern const char ice_drv_ver[];
 #define ICE_MBXQ_LEN		64
 #define ICE_MIN_MSIX		2
 #define ICE_NO_VSI		0xffff
-#define ICE_MAX_VSI_ALLOC	130
 #define ICE_MAX_TXQS		2048
 #define ICE_MAX_RXQS		2048
 #define ICE_VSI_MAP_CONTIG	0

drivers/net/ethernet/intel/ice/ice_adminq_cmd.h

@@ -87,6 +87,7 @@ struct ice_aqc_list_caps {
 /* Device/Function buffer entry, repeated per reported capability */
 struct ice_aqc_list_caps_elem {
 	__le16 cap;
+#define ICE_AQC_CAPS_VALID_FUNCTIONS			0x0005
 #define ICE_AQC_CAPS_SRIOV				0x0012
 #define ICE_AQC_CAPS_VF					0x0013
 #define ICE_AQC_CAPS_VSI				0x0017

drivers/net/ethernet/intel/ice/ice_common.c

@@ -1386,6 +1386,27 @@ void ice_release_res(struct ice_hw *hw, enum ice_aq_res_ids res)
 	}
 }
 
+/**
+ * ice_get_guar_num_vsi - determine number of guar VSI for a PF
+ * @hw: pointer to the hw structure
+ *
+ * Determine the number of valid functions by going through the bitmap returned
+ * from parsing capabilities and use this to calculate the number of VSI per PF.
+ */
+static u32 ice_get_guar_num_vsi(struct ice_hw *hw)
+{
+	u8 funcs;
+
+#define ICE_CAPS_VALID_FUNCS_M	0xFF
+	funcs = hweight8(hw->dev_caps.common_cap.valid_functions &
+			 ICE_CAPS_VALID_FUNCS_M);
+
+	if (!funcs)
+		return 0;
+
+	return ICE_MAX_VSI / funcs;
+}
+
 /**
  * ice_parse_caps - parse function/device capabilities
  * @hw: pointer to the hw struct
@@ -1428,6 +1449,12 @@ ice_parse_caps(struct ice_hw *hw, void *buf, u32 cap_count,
 		u16 cap = le16_to_cpu(cap_resp->cap);
 
 		switch (cap) {
+		case ICE_AQC_CAPS_VALID_FUNCTIONS:
+			caps->valid_functions = number;
+			ice_debug(hw, ICE_DBG_INIT,
+				  "HW caps: Valid Functions = %d\n",
+				  caps->valid_functions);
+			break;
 		case ICE_AQC_CAPS_SRIOV:
 			caps->sr_iov_1_1 = (number == 1);
 			ice_debug(hw, ICE_DBG_INIT,
@@ -1457,10 +1484,10 @@ ice_parse_caps(struct ice_hw *hw, void *buf, u32 cap_count,
 					  "HW caps: Dev.VSI cnt = %d\n",
 					  dev_p->num_vsi_allocd_to_host);
 			} else if (func_p) {
-				func_p->guaranteed_num_vsi = number;
+				func_p->guar_num_vsi = ice_get_guar_num_vsi(hw);
 				ice_debug(hw, ICE_DBG_INIT,
 					  "HW caps: Func.VSI cnt = %d\n",
-					  func_p->guaranteed_num_vsi);
+					  number);
 			}
 			break;
 		case ICE_AQC_CAPS_RSS:

drivers/net/ethernet/intel/ice/ice_main.c

@@ -2091,8 +2091,7 @@ static int ice_probe(struct pci_dev *pdev,
 
 	ice_determine_q_usage(pf);
 
-	pf->num_alloc_vsi = min_t(u16, ICE_MAX_VSI_ALLOC,
-				  hw->func_caps.guaranteed_num_vsi);
+	pf->num_alloc_vsi = hw->func_caps.guar_num_vsi;
 	if (!pf->num_alloc_vsi) {
 		err = -EIO;
 		goto err_init_pf_unroll;

drivers/net/ethernet/intel/ice/ice_type.h

@@ -124,6 +124,8 @@ struct ice_phy_info {
 
 /* Common HW capabilities for SW use */
 struct ice_hw_common_caps {
+	u32 valid_functions;
+
 	/* TX/RX queues */
 	u16 num_rxq;		/* Number/Total RX queues */
 	u16 rxq_first_id;	/* First queue ID for RX queues */
@@ -150,7 +152,7 @@ struct ice_hw_func_caps {
 	struct ice_hw_common_caps common_cap;
 	u32 num_allocd_vfs;		/* Number of allocated VFs */
 	u32 vf_base_id;			/* Logical ID of the first VF */
-	u32 guaranteed_num_vsi;
+	u32 guar_num_vsi;
 };
 
 /* Device wide capabilities */