ice: introduce VF accessor functions

Before we switch the VF data structure storage mechanism to a hash,
introduce new accessor functions to define the new interface.

* ice_get_vf_by_id is a function used to obtain a reference to a VF from
  the table based on its VF ID
* ice_has_vfs is used to quickly check if any VFs are configured
* ice_get_num_vfs is used to get an exact count of how many VFs are
  configured

We can drop the old ice_validate_vf_id function, since every caller was
just going to immediately access the VF table to get a reference
anyways. This way we simply use the single ice_get_vf_by_id to both
validate the VF ID is within range and that there exists a VF with that
ID.

This change enables us to more easily convert the codebase to the hash
table since most callers now properly use the interface.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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

@@ -182,10 +182,10 @@ static void ice_eswitch_remap_rings_to_vectors(struct ice_pf *pf)
 		struct ice_repr *repr;
 		struct ice_vf *vf;
 
-		if (WARN_ON(q_id >= pf->vfs.num_alloc))
+		vf = ice_get_vf_by_id(pf, q_id);
+		if (WARN_ON(!vf))
 			continue;
 
-		vf = &pf->vfs.table[q_id];
 		repr = vf->repr;
 		q_vector = repr->q_vector;
 		tx_ring = vsi->tx_rings[q_id];
@@ -535,7 +535,7 @@ ice_eswitch_mode_set(struct devlink *devlink, u16 mode,
 	if (pf->eswitch_mode == mode)
 		return 0;
 
-	if (pf->vfs.num_alloc) {
+	if (ice_has_vfs(pf)) {
 		dev_info(ice_pf_to_dev(pf), "Changing eswitch mode is allowed only if there is no VFs created");
 		NL_SET_ERR_MSG_MOD(extack, "Changing eswitch mode is allowed only if there is no VFs created");
 		return -EOPNOTSUPP;

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

@@ -1297,7 +1297,7 @@ static int ice_set_priv_flags(struct net_device *netdev, u32 flags)
 	}
 
 	if (test_bit(ICE_FLAG_VF_VLAN_PRUNING, change_flags) &&
-	    pf->vfs.num_alloc) {
+	    ice_has_vfs(pf)) {
 		dev_err(dev, "vf-vlan-pruning: VLAN pruning cannot be changed while VFs are active.\n");
 		/* toggle bit back to previous state */
 		change_bit(ICE_FLAG_VF_VLAN_PRUNING, pf->flags);

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

@@ -215,8 +215,8 @@ static void ice_vsi_set_num_qs(struct ice_vsi *vsi, struct ice_vf *vf)
 		/* The number of queues for ctrl VSI is equal to number of VFs.
 		 * Each ring is associated to the corresponding VF_PR netdev.
 		 */
-		vsi->alloc_txq = pf->vfs.num_alloc;
-		vsi->alloc_rxq = pf->vfs.num_alloc;
+		vsi->alloc_txq = ice_get_num_vfs(pf);
+		vsi->alloc_rxq = vsi->alloc_txq;
 		vsi->num_q_vectors = 1;
 		break;
 	case ICE_VSI_VF:

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

@@ -175,18 +175,58 @@ struct ice_vsi *ice_get_vf_vsi(struct ice_vf *vf)
 }
 
 /**
- * ice_validate_vf_id - helper to check if VF ID is valid
- * @pf: pointer to the PF structure
- * @vf_id: the ID of the VF to check
+ * ice_get_vf_by_id - Get pointer to VF by ID
+ * @pf: the PF private structure
+ * @vf_id: the VF ID to locate
+ *
+ * Locate and return a pointer to the VF structure associated with a given ID.
+ * Returns NULL if the ID does not have a valid VF structure associated with
+ * it.
  */
-static int ice_validate_vf_id(struct ice_pf *pf, u16 vf_id)
+struct ice_vf *ice_get_vf_by_id(struct ice_pf *pf, u16 vf_id)
 {
-	/* vf_id range is only valid for 0-255, and should always be unsigned */
+	if (!pf->vfs.table) {
+		dev_err(ice_pf_to_dev(pf), "VF table not allocated\n");
+		return NULL;
+	}
+
 	if (vf_id >= pf->vfs.num_alloc) {
-		dev_err(ice_pf_to_dev(pf), "Invalid VF ID: %u\n", vf_id);
-		return -EINVAL;
+		dev_err(ice_pf_to_dev(pf), "Out of range VF ID: %u\n",
+			vf_id);
+		return NULL;
 	}
-	return 0;
+
+	return &pf->vfs.table[vf_id];
+}
+
+/**
+ * ice_has_vfs - Return true if the PF has any associated VFs
+ * @pf: the PF private structure
+ *
+ * Return whether or not the PF has any allocated VFs.
+ *
+ * Note that this function only guarantees that there are no VFs at the point
+ * of calling it. It does not guarantee that no more VFs will be added.
+ */
+bool ice_has_vfs(struct ice_pf *pf)
+{
+	return pf->vfs.table && pf->vfs.num_alloc > 0;
+}
+
+/**
+ * ice_get_num_vfs - Get number of allocated VFs
+ * @pf: the PF private structure
+ *
+ * Return the total number of allocated VFs. NOTE: VF IDs are not guaranteed
+ * to be contiguous. Do not assume that a VF ID is guaranteed to be less than
+ * the output of this function.
+ */
+u16 ice_get_num_vfs(struct ice_pf *pf)
+{
+	if (!pf->vfs.table)
+		return 0;
+
+	return pf->vfs.num_alloc;
 }
 
 /**
@@ -503,7 +543,7 @@ void ice_free_vfs(struct ice_pf *pf)
 	struct ice_vf *vf;
 	unsigned int bkt;
 
-	if (!vfs->table)
+	if (!ice_has_vfs(pf))
 		return;
 
 	ice_eswitch_release(pf);
@@ -1464,7 +1504,7 @@ bool ice_reset_all_vfs(struct ice_pf *pf, bool is_vflr)
 	unsigned int bkt;
 
 	/* If we don't have any VFs, then there is nothing to reset */
-	if (!pf->vfs.num_alloc)
+	if (!ice_has_vfs(pf))
 		return false;
 
 	/* clear all malicious info if the VFs are getting reset */
@@ -1709,7 +1749,7 @@ void ice_vc_notify_reset(struct ice_pf *pf)
 {
 	struct virtchnl_pf_event pfe;
 
-	if (!pf->vfs.num_alloc)
+	if (!ice_has_vfs(pf))
 		return;
 
 	pfe.event = VIRTCHNL_EVENT_RESET_IMPENDING;
@@ -1725,14 +1765,7 @@ void ice_vc_notify_reset(struct ice_pf *pf)
 static void ice_vc_notify_vf_reset(struct ice_vf *vf)
 {
 	struct virtchnl_pf_event pfe;
-	struct ice_pf *pf;
-
-	if (!vf)
-		return;
-
-	pf = vf->pf;
-	if (ice_validate_vf_id(pf, vf->vf_id))
-		return;
+	struct ice_pf *pf = vf->pf;
 
 	/* Bail out if VF is in disabled state, neither initialized, nor active
 	 * state - otherwise proceed with notifications
@@ -2097,7 +2130,7 @@ void ice_process_vflr_event(struct ice_pf *pf)
 	u32 reg;
 
 	if (!test_and_clear_bit(ICE_VFLR_EVENT_PENDING, pf->state) ||
-	    !pf->vfs.num_alloc)
+	    !ice_has_vfs(pf))
 		return;
 
 	ice_for_each_vf(pf, bkt, vf) {
@@ -2968,10 +3001,11 @@ int ice_set_vf_spoofchk(struct net_device *netdev, int vf_id, bool ena)
 	int ret;
 
 	dev = ice_pf_to_dev(pf);
-	if (ice_validate_vf_id(pf, vf_id))
+
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -4159,8 +4193,6 @@ ice_set_vf_port_vlan(struct net_device *netdev, int vf_id, u16 vlan_id, u8 qos,
 	int ret;
 
 	dev = ice_pf_to_dev(pf);
-	if (ice_validate_vf_id(pf, vf_id))
-		return -EINVAL;
 
 	if (vlan_id >= VLAN_N_VID || qos > 7) {
 		dev_err(dev, "Invalid Port VLAN parameters for VF %d, ID %d, QoS %d\n",
@@ -4174,7 +4206,10 @@ ice_set_vf_port_vlan(struct net_device *netdev, int vf_id, u16 vlan_id, u8 qos,
 		return -EPROTONOSUPPORT;
 	}
 
-	vf = &pf->vfs.table[vf_id];
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
+		return -EINVAL;
+
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -5722,14 +5757,14 @@ void ice_vc_process_vf_msg(struct ice_pf *pf, struct ice_rq_event_info *event)
 	int err = 0;
 
 	dev = ice_pf_to_dev(pf);
-	if (ice_validate_vf_id(pf, vf_id)) {
+
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf) {
 		dev_err(dev, "Unable to locate VF for message from VF ID %d, opcode %d, len %d\n",
 			vf_id, v_opcode, msglen);
 		return;
 	}
 
-	vf = &pf->vfs.table[vf_id];
-
 	/* Check if VF is disabled. */
 	if (test_bit(ICE_VF_STATE_DIS, vf->vf_states)) {
 		err = -EPERM;
@@ -5898,14 +5933,15 @@ ice_get_vf_cfg(struct net_device *netdev, int vf_id, struct ifla_vf_info *ivi)
 {
 	struct ice_pf *pf = ice_netdev_to_pf(netdev);
 	struct ice_vf *vf;
+	int ret;
 
-	if (ice_validate_vf_id(pf, vf_id))
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
-
-	if (ice_check_vf_init(pf, vf))
-		return -EBUSY;
+	ret = ice_check_vf_ready_for_cfg(vf);
+	if (ret)
+		return ret;
 
 	ivi->vf = vf_id;
 	ether_addr_copy(ivi->mac, vf->hw_lan_addr.addr);
@@ -5976,15 +6012,15 @@ int ice_set_vf_mac(struct net_device *netdev, int vf_id, u8 *mac)
 	struct ice_vf *vf;
 	int ret;
 
-	if (ice_validate_vf_id(pf, vf_id))
-		return -EINVAL;
-
 	if (is_multicast_ether_addr(mac)) {
 		netdev_err(netdev, "%pM not a valid unicast address\n", mac);
 		return -EINVAL;
 	}
 
-	vf = &pf->vfs.table[vf_id];
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
+		return -EINVAL;
+
 	/* nothing left to do, unicast MAC already set */
 	if (ether_addr_equal(vf->dev_lan_addr.addr, mac) &&
 	    ether_addr_equal(vf->hw_lan_addr.addr, mac))
@@ -6043,10 +6079,10 @@ int ice_set_vf_trust(struct net_device *netdev, int vf_id, bool trusted)
 		return -EOPNOTSUPP;
 	}
 
-	if (ice_validate_vf_id(pf, vf_id))
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -6081,10 +6117,10 @@ int ice_set_vf_link_state(struct net_device *netdev, int vf_id, int link_state)
 	struct ice_vf *vf;
 	int ret;
 
-	if (ice_validate_vf_id(pf, vf_id))
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -6176,10 +6212,11 @@ ice_set_vf_bw(struct net_device *netdev, int vf_id, int min_tx_rate,
 	int ret;
 
 	dev = ice_pf_to_dev(pf);
-	if (ice_validate_vf_id(pf, vf_id))
+
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -6243,10 +6280,10 @@ int ice_get_vf_stats(struct net_device *netdev, int vf_id,
 	struct ice_vf *vf;
 	int ret;
 
-	if (ice_validate_vf_id(pf, vf_id))
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return -EINVAL;
 
-	vf = &pf->vfs.table[vf_id];
 	ret = ice_check_vf_ready_for_cfg(vf);
 	if (ret)
 		return ret;
@@ -6384,10 +6421,10 @@ ice_is_malicious_vf(struct ice_pf *pf, struct ice_rq_event_info *event,
 	struct ice_vf *vf;
 	int status;
 
-	if (ice_validate_vf_id(pf, vf_id))
+	vf = ice_get_vf_by_id(pf, vf_id);
+	if (!vf)
 		return false;
 
-	vf = &pf->vfs.table[vf_id];
 	/* Check if VF is disabled. */
 	if (test_bit(ICE_VF_STATE_DIS, vf->vf_states))
 		return false;

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

@@ -39,6 +39,13 @@
 #define ICE_MAX_VF_RESET_TRIES		40
 #define ICE_MAX_VF_RESET_SLEEP_MS	20
 
+/* VF Hash Table access functions
+ *
+ * These functions provide abstraction for interacting with the VF hash table.
+ * In general, direct access to the hash table should be avoided outside of
+ * these functions where possible.
+ */
+
 /**
  * ice_for_each_vf - Iterate over each VF entry
  * @pf: pointer to the PF private structure
@@ -185,6 +192,9 @@ struct ice_vf {
 };
 
 #ifdef CONFIG_PCI_IOV
+struct ice_vf *ice_get_vf_by_id(struct ice_pf *pf, u16 vf_id);
+bool ice_has_vfs(struct ice_pf *pf);
+u16 ice_get_num_vfs(struct ice_pf *pf);
 struct ice_vsi *ice_get_vf_vsi(struct ice_vf *vf);
 void ice_process_vflr_event(struct ice_pf *pf);
 int ice_sriov_configure(struct pci_dev *pdev, int num_vfs);
@@ -244,6 +254,21 @@ ice_vc_send_msg_to_vf(struct ice_vf *vf, u32 v_opcode,
 bool ice_vc_isvalid_vsi_id(struct ice_vf *vf, u16 vsi_id);
 bool ice_vf_is_port_vlan_ena(struct ice_vf *vf);
 #else /* CONFIG_PCI_IOV */
+static inline struct ice_vf *ice_get_vf_by_id(struct ice_pf *pf, u16 vf_id)
+{
+	return NULL;
+}
+
+static inline bool ice_has_vfs(struct ice_pf *pf)
+{
+	return false;
+}
+
+static inline u16 ice_get_num_vfs(struct ice_pf *pf)
+{
+	return 0;
+}
+
 static inline void ice_process_vflr_event(struct ice_pf *pf) { }
 static inline void ice_free_vfs(struct ice_pf *pf) { }
 static inline