ice: avoid bonding causing auxiliary plug/unplug under RTNL lock

RDMA is not supported in ice on a PF that has been added to a bonded
interface. To enforce this, when an interface enters a bond, we unplug
the auxiliary device that supports RDMA functionality.  This unplug
currently happens in the context of handling the netdev bonding event.
This event is sent to the ice driver under RTNL context.  This is causing
a deadlock where the RDMA driver is waiting for the RTNL lock to complete
the removal.

Defer the unplugging/re-plugging of the auxiliary device to the service
task so that it is not performed under the RTNL lock context.

Cc: [email protected] # 6.1.x
Reported-by: Jaroslav Pulchart <[email protected]>
Link: https://lore.kernel.org/netdev/CAK8fFZ6A_Gphw_3-QMGKEFQk=sfCw1Qmq0TVZK3rtAi7vb621A@mail.gmail.com/
Fixes: 5cb1ebd ("ice: Fix race condition during interface enslave")
Fixes: 4eace75 ("RDMA/irdma: Report the correct link speed")
Signed-off-by: Dave Ertman <[email protected]>
Tested-by: Arpana Arland <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>
Reviewed-by: Leon Romanovsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: dmertman

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

@@ -509,6 +509,7 @@ enum ice_pf_flags {
 	ICE_FLAG_VF_VLAN_PRUNING,
 	ICE_FLAG_LINK_LENIENT_MODE_ENA,
 	ICE_FLAG_PLUG_AUX_DEV,
+	ICE_FLAG_UNPLUG_AUX_DEV,
 	ICE_FLAG_MTU_CHANGED,
 	ICE_FLAG_GNSS,			/* GNSS successfully initialized */
 	ICE_PF_FLAGS_NBITS		/* must be last */
@@ -955,16 +956,11 @@ static inline void ice_set_rdma_cap(struct ice_pf *pf)
  */
 static inline void ice_clear_rdma_cap(struct ice_pf *pf)
 {
-	/* We can directly unplug aux device here only if the flag bit
-	 * ICE_FLAG_PLUG_AUX_DEV is not set because ice_unplug_aux_dev()
-	 * could race with ice_plug_aux_dev() called from
-	 * ice_service_task(). In this case we only clear that bit now and
-	 * aux device will be unplugged later once ice_plug_aux_device()
-	 * called from ice_service_task() finishes (see ice_service_task()).
+	/* defer unplug to service task to avoid RTNL lock and
+	 * clear PLUG bit so that pending plugs don't interfere
 	 */
-	if (!test_and_clear_bit(ICE_FLAG_PLUG_AUX_DEV, pf->flags))
-		ice_unplug_aux_dev(pf);
-
+	clear_bit(ICE_FLAG_PLUG_AUX_DEV, pf->flags);
+	set_bit(ICE_FLAG_UNPLUG_AUX_DEV, pf->flags);
 	clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);
 }
 #endif /* _ICE_H_ */

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

@@ -2316,18 +2316,15 @@ static void ice_service_task(struct work_struct *work)
 		}
 	}
 
-	if (test_bit(ICE_FLAG_PLUG_AUX_DEV, pf->flags)) {
-		/* Plug aux device per request */
-		ice_plug_aux_dev(pf);
+	/* unplug aux dev per request, if an unplug request came in
+	 * while processing a plug request, this will handle it
+	 */
+	if (test_and_clear_bit(ICE_FLAG_UNPLUG_AUX_DEV, pf->flags))
+		ice_unplug_aux_dev(pf);
 
-		/* Mark plugging as done but check whether unplug was
-		 * requested during ice_plug_aux_dev() call
-		 * (e.g. from ice_clear_rdma_cap()) and if so then
-		 * plug aux device.
-		 */
-		if (!test_and_clear_bit(ICE_FLAG_PLUG_AUX_DEV, pf->flags))
-			ice_unplug_aux_dev(pf);
-	}
+	/* Plug aux device per request */
+	if (test_and_clear_bit(ICE_FLAG_PLUG_AUX_DEV, pf->flags))
+		ice_plug_aux_dev(pf);
 
 	if (test_and_clear_bit(ICE_FLAG_MTU_CHANGED, pf->flags)) {
 		struct iidc_event *event;