i40e: move I40E_FLAG_TEMP_LINK_POLLING to state field

This flag is modified outside of the RTNL lock and thus should not be
part of the pf->flags variable.

Use a state bit instead, so that we can use atomic bit operations.

This is part of a larger effort to remove cmpxchg64 in
i40e_set_priv_flags()

Signed-off-by: Jacob Keller <jacob.e.keller@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.h

@@ -166,6 +166,7 @@ enum i40e_state_t {
 	__I40E_VF_DISABLE,
 	__I40E_MACVLAN_SYNC_PENDING,
 	__I40E_UDP_FILTER_SYNC_PENDING,
+	__I40E_TEMP_LINK_POLLING,
 	/* This must be last as it determines the size of the BITMAP */
 	__I40E_STATE_SIZE__,
 };
@@ -534,7 +535,7 @@ struct i40e_pf {
 #define I40E_FLAG_VEB_STATS_ENABLED		BIT_ULL(17)
 #define I40E_FLAG_LINK_POLLING_ENABLED		BIT_ULL(18)
 #define I40E_FLAG_TRUE_PROMISC_SUPPORT		BIT_ULL(19)
-#define I40E_FLAG_TEMP_LINK_POLLING		BIT_ULL(20)
+/* Gap for BIT_ULL(20) */
 #define I40E_FLAG_LEGACY_RX			BIT_ULL(21)
 #define I40E_FLAG_PTP				BIT_ULL(22)
 #define I40E_FLAG_IWARP_ENABLED			BIT_ULL(23)

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -8432,13 +8432,12 @@ static void i40e_link_event(struct i40e_pf *pf)
 
 	/* On success, disable temp link polling */
 	if (status == I40E_SUCCESS) {
-		if (pf->flags & I40E_FLAG_TEMP_LINK_POLLING)
-			pf->flags &= ~I40E_FLAG_TEMP_LINK_POLLING;
+		clear_bit(__I40E_TEMP_LINK_POLLING, pf->state);
 	} else {
 		/* Enable link polling temporarily until i40e_get_link_status
 		 * returns I40E_SUCCESS
 		 */
-		pf->flags |= I40E_FLAG_TEMP_LINK_POLLING;
+		set_bit(__I40E_TEMP_LINK_POLLING, pf->state);
 		dev_dbg(&pf->pdev->dev, "couldn't get link state, status: %d\n",
 			status);
 		return;
@@ -8490,7 +8489,7 @@ static void i40e_watchdog_subtask(struct i40e_pf *pf)
 	pf->service_timer_previous = jiffies;
 
 	if ((pf->flags & I40E_FLAG_LINK_POLLING_ENABLED) ||
-	    (pf->flags & I40E_FLAG_TEMP_LINK_POLLING))
+	    test_bit(__I40E_TEMP_LINK_POLLING, pf->state))
 		i40e_link_event(pf);
 
 	/* Update the stats for active netdevs so the network stack