ice: stop destroying and reinitalizing Tx tracker during reset

The ice driver currently attempts to destroy and re-initialize the Tx
timestamp tracker during the reset flow. The release of the Tx tracker
only happened during CORE reset or GLOBAL reset. The ice_ptp_rebuild()
function always calls the ice_ptp_init_tx function which will allocate
a new tracker data structure, resulting in memory leaks during PF reset.

Certainly the driver should not be allocating a new tracker without
removing the old tracker data, as this results in a memory leak.
Additionally, there's no reason to remove the tracker memory during a
reset. Remove this logic from the reset and rebuild flow. Instead of
releasing the Tx tracker, flush outstanding timestamps just before we
reset the PHY timestamp block in ice_ptp_cfg_phy_interrupt().
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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

@@ -963,6 +963,22 @@ ice_ptp_mark_tx_tracker_stale(struct ice_ptp_tx *tx)
 	spin_unlock_irqrestore(&tx->lock, flags);
 }
 
+/**
+ * ice_ptp_flush_all_tx_tracker - Flush all timestamp trackers on this clock
+ * @pf: Board private structure
+ *
+ * Called by the clock owner to flush all the Tx timestamp trackers associated
+ * with the clock.
+ */
+static void
+ice_ptp_flush_all_tx_tracker(struct ice_pf *pf)
+{
+	struct ice_ptp_port *port;
+
+	list_for_each_entry(port, &pf->ptp.ports_owner.ports, list_member)
+		ice_ptp_flush_tx_tracker(ptp_port_to_pf(port), &port->tx);
+}
+
 /**
  * ice_ptp_release_tx_tracker - Release allocated memory for Tx tracker
  * @pf: Board private structure
@@ -2715,6 +2731,11 @@ static int ice_ptp_rebuild_owner(struct ice_pf *pf)
 	/* Release the global hardware lock */
 	ice_ptp_unlock(hw);
 
+	/* Flush software tracking of any outstanding timestamps since we're
+	 * about to flush the PHY timestamp block.
+	 */
+	ice_ptp_flush_all_tx_tracker(pf);
+
 	if (!ice_is_e810(hw)) {
 		/* Enable quad interrupts */
 		err = ice_ptp_cfg_phy_interrupt(pf, true, 1);
@@ -2751,18 +2772,6 @@ void ice_ptp_rebuild(struct ice_pf *pf, enum ice_reset_req reset_type)
 			goto err;
 	}
 
-	/* Init Tx structures */
-	if (ice_is_e810(&pf->hw)) {
-		err = ice_ptp_init_tx_e810(pf, &ptp->port.tx);
-	} else {
-		kthread_init_delayed_work(&ptp->port.ov_work,
-					  ice_ptp_wait_for_offsets);
-		err = ice_ptp_init_tx_e82x(pf, &ptp->port.tx,
-					   ptp->port.port_num);
-	}
-	if (err)
-		goto err;
-
 	ptp->state = ICE_PTP_READY;
 
 	/* Start periodic work going */