ice: Prevent set_channel from changing queues while RDMA active

The PF controls the set of queues that the RDMA auxiliary_driver requests
resources from.  The set_channel command will alter that pool and trigger a
reconfiguration of the VSI, which breaks RDMA functionality.

Prevent set_channel from executing when RDMA driver bound to auxiliary
device.

Adding a locked variable to pass down the call chain to avoid double
locking the device_lock.

Fixes: 348048e724a0 ("ice: Implement iidc operations")
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 13 insertions, 10 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
index 4f24d441c35e..0a55c552189a 100644
--- a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
@@ -441,7 +441,7 @@ int ice_pf_dcb_cfg(struct ice_pf *pf, struct ice_dcbx_cfg *new_cfg, bool locked)
 		goto out;
 	}
 
-	ice_pf_dcb_recfg(pf);
+	ice_pf_dcb_recfg(pf, false);
 
 out:
 	/* enable previously downed VSIs */
@@ -731,12 +731,13 @@ static int ice_dcb_noncontig_cfg(struct ice_pf *pf)
 /**
  * ice_pf_dcb_recfg - Reconfigure all VEBs and VSIs
  * @pf: pointer to the PF struct
+ * @locked: is adev device lock held
  *
  * Assumed caller has already disabled all VSIs before
  * calling this function. Reconfiguring DCB based on
  * local_dcbx_cfg.
  */
-void ice_pf_dcb_recfg(struct ice_pf *pf)
+void ice_pf_dcb_recfg(struct ice_pf *pf, bool locked)
 {
 	struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
 	struct iidc_event *event;
@@ -783,14 +784,16 @@ void ice_pf_dcb_recfg(struct ice_pf *pf)
 		if (vsi->type == ICE_VSI_PF)
 			ice_dcbnl_set_all(vsi);
 	}
-	/* Notify the AUX drivers that TC change is finished */
-	event = kzalloc(sizeof(*event), GFP_KERNEL);
-	if (!event)
-		return;
+	if (!locked) {
+		/* Notify the AUX drivers that TC change is finished */
+		event = kzalloc(sizeof(*event), GFP_KERNEL);
+		if (!event)
+			return;
 
-	set_bit(IIDC_EVENT_AFTER_TC_CHANGE, event->type);
-	ice_send_event_to_aux(pf, event);
-	kfree(event);
+		set_bit(IIDC_EVENT_AFTER_TC_CHANGE, event->type);
+		ice_send_event_to_aux(pf, event);
+		kfree(event);
+	}
 }
 
 /**
@@ -1044,7 +1047,7 @@ ice_dcb_process_lldp_set_mib_change(struct ice_pf *pf,
 	}
 
 	/* changes in configuration update VSI */
-	ice_pf_dcb_recfg(pf);
+	ice_pf_dcb_recfg(pf, false);
 
 	/* enable previously downed VSIs */
 	ice_dcb_ena_dis_vsi(pf, true, true);