idpf: avoid mailbox timeout delays during reset

JIRA: https://issues.redhat.com/browse/RHEL-79685

commit 9dc63d8
Author: Emil Tantilov <emil.s.tantilov@intel.com>
Date:   Thu May 8 11:47:15 2025 -0700

    idpf: avoid mailbox timeout delays during reset

    Mailbox operations are not possible while the driver is in reset.
    Operations that require MBX exchange with the control plane will result
    in long delays if executed while a reset is in progress:

    ethtool -L <inf> combined 8& echo 1 > /sys/class/net/<inf>/device/reset
    idpf 0000:83:00.0: HW reset detected
    idpf 0000:83:00.0: Device HW Reset initiated
    idpf 0000:83:00.0: Transaction timed-out (op:504 cookie:be00 vc_op:504 salt:be timeout:2000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:508 cookie:bf00 vc_op:508 salt:bf timeout:2000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:512 cookie:c000 vc_op:512 salt:c0 timeout:2000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:510 cookie:c100 vc_op:510 salt:c1 timeout:2000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:509 cookie:c200 vc_op:509 salt:c2 timeout:60000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:509 cookie:c300 vc_op:509 salt:c3 timeout:60000ms)
    idpf 0000:83:00.0: Transaction timed-out (op:505 cookie:c400 vc_op:505 salt:c4 timeout:60000ms)
    idpf 0000:83:00.0: Failed to configure queues for vport 0, -62

    Disable mailbox communication in case of a reset, unless it's done during
    a driver load, where the virtchnl operations are needed to configure the
    device.

    Fixes: 8077c72 ("idpf: add controlq init and reset checks")
    Co-developed-by: Joshua Hay <joshua.a.hay@intel.com>
    Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
    Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
    Reviewed-by: Ahmed Zaki <ahmed.zaki@intel.com>
    Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Tested-by: Samuel Salin <Samuel.salin@intel.com>
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>

Author: michich

drivers/net/ethernet/intel/idpf/idpf_lib.c

@@ -1815,11 +1815,19 @@ void idpf_vc_event_task(struct work_struct *work)
 	if (test_bit(IDPF_REMOVE_IN_PROG, adapter->flags))
 		return;
 
-	if (test_bit(IDPF_HR_FUNC_RESET, adapter->flags) ||
-	    test_bit(IDPF_HR_DRV_LOAD, adapter->flags)) {
-		set_bit(IDPF_HR_RESET_IN_PROG, adapter->flags);
-		idpf_init_hard_reset(adapter);
-	}
+	if (test_bit(IDPF_HR_FUNC_RESET, adapter->flags))
+		goto func_reset;
+
+	if (test_bit(IDPF_HR_DRV_LOAD, adapter->flags))
+		goto drv_load;
+
+	return;
+
+func_reset:
+	idpf_vc_xn_shutdown(adapter->vcxn_mngr);
+drv_load:
+	set_bit(IDPF_HR_RESET_IN_PROG, adapter->flags);
+	idpf_init_hard_reset(adapter);
 }
 
 /**

drivers/net/ethernet/intel/idpf/idpf_virtchnl.c

@@ -376,7 +376,7 @@ static void idpf_vc_xn_init(struct idpf_vc_xn_manager *vcxn_mngr)
  * All waiting threads will be woken-up and their transaction aborted. Further
  * operations on that object will fail.
  */
-static void idpf_vc_xn_shutdown(struct idpf_vc_xn_manager *vcxn_mngr)
+void idpf_vc_xn_shutdown(struct idpf_vc_xn_manager *vcxn_mngr)
 {
 	int i;
 

drivers/net/ethernet/intel/idpf/idpf_virtchnl.h

@@ -66,5 +66,6 @@ int idpf_send_get_stats_msg(struct idpf_vport *vport);
 int idpf_send_set_sriov_vfs_msg(struct idpf_adapter *adapter, u16 num_vfs);
 int idpf_send_get_set_rss_key_msg(struct idpf_vport *vport, bool get);
 int idpf_send_get_set_rss_lut_msg(struct idpf_vport *vport, bool get);
+void idpf_vc_xn_shutdown(struct idpf_vc_xn_manager *vcxn_mngr);
 
 #endif /* _IDPF_VIRTCHNL_H_ */