netdev - [iwl-next v2 5/6] idpf: implement IDC vport aux driver MTU change handler

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Message-ID: <20250612220002.1120-6-tatyana.e.nikolova@intel.com>
Date: Thu, 12 Jun 2025 17:00:01 -0500
From: Tatyana Nikolova <tatyana.e.nikolova@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: jgg@...dia.com,
	leon@...nel.org,
	linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org,
	kuba@...nel.org,
	Joshua Hay <joshua.a.hay@...el.com>,
	Tatyana Nikolova <tatyana.e.nikolova@...el.com>
Subject: [iwl-next v2 5/6] idpf: implement IDC vport aux driver MTU change handler

From: Joshua Hay <joshua.a.hay@...el.com>

The only event an RDMA vport aux driver cares about right now is an MTU
change on its underlying vport. Implement and plumb the handler to
signal the pre MTU change event and post MTU change events to the RDMA
vport aux driver.

Reviewed-by: Madhu Chittim <madhu.chittim@...el.com>
Signed-off-by: Joshua Hay <joshua.a.hay@...el.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@...el.com>
---

Changes since split:
- align with iidc_rdma header naming

[3]:
- add missing break statement
- remove unnecessary iadrv NULL check

 drivers/net/ethernet/intel/idpf/idpf.h     |  2 ++
 drivers/net/ethernet/intel/idpf/idpf_idc.c | 31 ++++++++++++++++++++++
 drivers/net/ethernet/intel/idpf/idpf_lib.c | 11 +++++---
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/idpf/idpf.h b/drivers/net/ethernet/intel/idpf/idpf.h
index e74b0f3012eb..f1bb10ae34b3 100644
--- a/drivers/net/ethernet/intel/idpf/idpf.h
+++ b/drivers/net/ethernet/intel/idpf/idpf.h
@@ -893,5 +893,7 @@ int idpf_idc_init_aux_core_dev(struct idpf_adapter *adapter,
 void idpf_idc_deinit_core_aux_device(struct iidc_rdma_core_dev_info *cdev_info);
 void idpf_idc_deinit_vport_aux_device(struct iidc_rdma_vport_dev_info *vdev_info);
 void idpf_idc_issue_reset_event(struct iidc_rdma_core_dev_info *cdev_info);
+void idpf_idc_vdev_mtu_event(struct iidc_rdma_vport_dev_info *vdev_info,
+			     enum iidc_rdma_event_type event_type);
 
 #endif /* !_IDPF_H_ */
diff --git a/drivers/net/ethernet/intel/idpf/idpf_idc.c b/drivers/net/ethernet/intel/idpf/idpf_idc.c
index 7401e41a5d28..15907341e0bb 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_idc.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_idc.c
@@ -137,6 +137,37 @@ static int idpf_idc_init_aux_vport_dev(struct idpf_vport *vport)
 	return 0;
 }
 
+/**
+ * idpf_idc_vdev_mtu_event - Function to handle IDC vport mtu change events
+ * @vdev_info: IDC vport device info pointer
+ * @event_type: type of event to pass to handler
+ */
+void idpf_idc_vdev_mtu_event(struct iidc_rdma_vport_dev_info *vdev_info,
+			     enum iidc_rdma_event_type event_type)
+{
+	struct iidc_rdma_vport_auxiliary_drv *iadrv;
+	struct iidc_rdma_event event = { };
+	struct auxiliary_device *adev;
+
+	if (!vdev_info)
+		/* RDMA is not enabled */
+		return;
+
+	set_bit(event_type, event.type);
+
+	device_lock(&vdev_info->adev->dev);
+	adev = vdev_info->adev;
+	if (!adev || !adev->dev.driver)
+		goto unlock;
+	iadrv = container_of(adev->dev.driver,
+			     struct iidc_rdma_vport_auxiliary_drv,
+			     adrv.driver);
+	if (iadrv->event_handler)
+		iadrv->event_handler(vdev_info, &event);
+unlock:
+	device_unlock(&vdev_info->adev->dev);
+}
+
 /**
  * idpf_core_adev_release - function to be mapped to aux dev's release op
  * @dev: pointer to device to free
diff --git a/drivers/net/ethernet/intel/idpf/idpf_lib.c b/drivers/net/ethernet/intel/idpf/idpf_lib.c
index 53392c01e03c..c0cd05529d33 100644
--- a/drivers/net/ethernet/intel/idpf/idpf_lib.c
+++ b/drivers/net/ethernet/intel/idpf/idpf_lib.c
@@ -1925,6 +1925,9 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport,
 		idpf_vport_calc_num_q_desc(new_vport);
 		break;
 	case IDPF_SR_MTU_CHANGE:
+		idpf_idc_vdev_mtu_event(vport->vdev_info,
+					IIDC_RDMA_EVENT_BEFORE_MTU_CHANGE);
+		break;
 	case IDPF_SR_RSC_CHANGE:
 		break;
 	default:
@@ -1969,9 +1972,7 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport,
 	if (current_state == __IDPF_VPORT_UP)
 		err = idpf_vport_open(vport);
 
-	kfree(new_vport);
-
-	return err;
+	goto free_vport;
 
 err_reset:
 	idpf_send_add_queues_msg(vport, vport->num_txq, vport->num_complq,
@@ -1984,6 +1985,10 @@ int idpf_initiate_soft_reset(struct idpf_vport *vport,
 free_vport:
 	kfree(new_vport);
 
+	if (reset_cause == IDPF_SR_MTU_CHANGE)
+		idpf_idc_vdev_mtu_event(vport->vdev_info,
+					IIDC_RDMA_EVENT_AFTER_MTU_CHANGE);
+
 	return err;
 }
 
-- 
2.31.1