ice: store VF's pci_dev ptr in ice_vf

Extend struct ice_vf by vfdev.
Calculation of vfdev falls more nicely into ice_create_vf_entries().

Caching of vfdev enables simplification of ice_restore_all_vfs_msi_state().

Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Co-developed-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
Signed-off-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -5541,7 +5541,7 @@ static void ice_pci_err_resume(struct pci_dev *pdev)
 		return;
 	}
 
-	ice_restore_all_vfs_msi_state(pdev);
+	ice_restore_all_vfs_msi_state(pf);
 
 	ice_do_reset(pf, ICE_RESET_PFR);
 	ice_service_task_restart(pf);

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

@@ -789,14 +789,19 @@ static const struct ice_vf_ops ice_sriov_vf_ops = {
  */
 static int ice_create_vf_entries(struct ice_pf *pf, u16 num_vfs)
 {
+	struct pci_dev *pdev = pf->pdev;
 	struct ice_vfs *vfs = &pf->vfs;
+	struct pci_dev *vfdev = NULL;
 	struct ice_vf *vf;
-	u16 vf_id;
-	int err;
+	u16 vf_pdev_id;
+	int err, pos;
 
 	lockdep_assert_held(&vfs->table_lock);
 
-	for (vf_id = 0; vf_id < num_vfs; vf_id++) {
+	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
+	pci_read_config_word(pdev, pos + PCI_SRIOV_VF_DID, &vf_pdev_id);
+
+	for (u16 vf_id = 0; vf_id < num_vfs; vf_id++) {
 		vf = kzalloc(sizeof(*vf), GFP_KERNEL);
 		if (!vf) {
 			err = -ENOMEM;
@@ -812,11 +817,23 @@ static int ice_create_vf_entries(struct ice_pf *pf, u16 num_vfs)
 
 		ice_initialize_vf_entry(vf);
 
+		do {
+			vfdev = pci_get_device(pdev->vendor, vf_pdev_id, vfdev);
+		} while (vfdev && vfdev->physfn != pdev);
+		vf->vfdev = vfdev;
 		vf->vf_sw_id = pf->first_sw;
 
+		pci_dev_get(vfdev);
+
 		hash_add_rcu(vfs->table, &vf->entry, vf_id);
 	}
 
+	/* Decrement of refcount done by pci_get_device() inside the loop does
+	 * not touch the last iteration's vfdev, so it has to be done manually
+	 * to balance pci_dev_get() added within the loop.
+	 */
+	pci_dev_put(vfdev);
+
 	return 0;
 
 err_free_entries:
@@ -1709,31 +1726,16 @@ void ice_print_vfs_mdd_events(struct ice_pf *pf)
 
 /**
  * ice_restore_all_vfs_msi_state - restore VF MSI state after PF FLR
- * @pdev: pointer to a pci_dev structure
+ * @pf: pointer to the PF structure
  *
  * Called when recovering from a PF FLR to restore interrupt capability to
  * the VFs.
  */
-void ice_restore_all_vfs_msi_state(struct pci_dev *pdev)
+void ice_restore_all_vfs_msi_state(struct ice_pf *pf)
 {
-	u16 vf_id;
-	int pos;
-
-	if (!pci_num_vf(pdev))
-		return;
+	struct ice_vf *vf;
+	u32 bkt;
 
-	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
-	if (pos) {
-		struct pci_dev *vfdev;
-
-		pci_read_config_word(pdev, pos + PCI_SRIOV_VF_DID,
-				     &vf_id);
-		vfdev = pci_get_device(pdev->vendor, vf_id, NULL);
-		while (vfdev) {
-			if (vfdev->is_virtfn && vfdev->physfn == pdev)
-				pci_restore_msi_state(vfdev);
-			vfdev = pci_get_device(pdev->vendor, vf_id,
-					       vfdev);
-		}
-	}
+	ice_for_each_vf(pf, bkt, vf)
+		pci_restore_msi_state(vf->vfdev);
 }

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

@@ -33,7 +33,7 @@ int
 ice_get_vf_cfg(struct net_device *netdev, int vf_id, struct ifla_vf_info *ivi);
 
 void ice_free_vfs(struct ice_pf *pf);
-void ice_restore_all_vfs_msi_state(struct pci_dev *pdev);
+void ice_restore_all_vfs_msi_state(struct ice_pf *pf);
 
 int
 ice_set_vf_port_vlan(struct net_device *netdev, int vf_id, u16 vlan_id, u8 qos,
@@ -67,7 +67,7 @@ static inline
 void ice_vf_lan_overflow_event(struct ice_pf *pf, struct ice_rq_event_info *event) { }
 static inline void ice_print_vfs_mdd_events(struct ice_pf *pf) { }
 static inline void ice_print_vf_rx_mdd_event(struct ice_vf *vf) { }
-static inline void ice_restore_all_vfs_msi_state(struct pci_dev *pdev) { }
+static inline void ice_restore_all_vfs_msi_state(struct ice_pf *pf) { }
 
 static inline int
 ice_sriov_configure(struct pci_dev __always_unused *pdev,

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

@@ -56,6 +56,8 @@ static void ice_release_vf(struct kref *ref)
 {
 	struct ice_vf *vf = container_of(ref, struct ice_vf, refcnt);
 
+	pci_dev_put(vf->vfdev);
+
 	vf->vf_ops->free(vf);
 }
 

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

@@ -82,7 +82,7 @@ struct ice_vf {
 	struct rcu_head rcu;
 	struct kref refcnt;
 	struct ice_pf *pf;
-
+	struct pci_dev *vfdev;
 	/* Used during virtchnl message handling and NDO ops against the VF
 	 * that will trigger a VFR
 	 */