[PATCH v4] net/ice: fix ice dcf control thread crash

[Mingjin Ye <mingjinx.ye@intel.com>]

The control thread accesses the hardware resources after the
resources were released, which results in a segment error.

The 'ice-reset' threads are detached, so thread resources cannot be
reclaimed by `pthread_join` calls.

This commit synchronizes the number of 'ice-reset' threads by adding two
variables (the 'vsi_update_thread_num' static global and
the 'vsi_thread_lock' static global spinlock). When releasing HW
resources, we clear the event callback function. That makes these threads
exit quickly. After the number of 'ice-reset' threads decreased to be 0,
we release resources.

Fixes: 3b3757bda3c3 ("net/ice: get VF hardware index in DCF")
Fixes: 931ee54072b1 ("net/ice: support QoS bandwidth config after VF reset in DCF")
Fixes: c7e1a1a3bfeb ("net/ice: refactor DCF VLAN handling")
Fixes: 0b02c9519432 ("net/ice: handle PF initialization by DCF")
Fixes: b71573ec2fc2 ("net/ice: retry getting VF VSI map after failure")
Fixes: 7564d5509611 ("net/ice: add DCF hardware initialization")
Cc: stable@dpdk.org

Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
---
v2: add pthread_exit() for windows
---
v3: Optimization. It is unsafe for a thread to forcibly exit, which
will cause the spin lock to not be released correctly
---
v4: Safely wait for all event threads to end
---
 drivers/net/ice/ice_dcf.c        | 18 ++++++++++++++--
 drivers/net/ice/ice_dcf.h        |  1 +
 drivers/net/ice/ice_dcf_parent.c | 37 ++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ice/ice_dcf.c b/drivers/net/ice/ice_dcf.c
index 1c3d22ae0f..169520f5bb 100644
--- a/drivers/net/ice/ice_dcf.c
+++ b/drivers/net/ice/ice_dcf.c
@@ -543,6 +543,8 @@ ice_dcf_handle_vsi_update_event(struct ice_dcf_hw *hw)
 	ice_dcf_disable_irq0(hw);
 
 	for (;;) {
+		if (hw->vc_event_msg_cb == NULL)
+			break;
 		if (ice_dcf_get_vf_resource(hw) == 0 &&
 		    ice_dcf_get_vf_vsi_map(hw) >= 0) {
 			err = 0;
@@ -555,8 +557,10 @@ ice_dcf_handle_vsi_update_event(struct ice_dcf_hw *hw)
 		rte_delay_ms(ICE_DCF_ARQ_CHECK_TIME);
 	}
 
-	rte_intr_enable(pci_dev->intr_handle);
-	ice_dcf_enable_irq0(hw);
+	if (hw->vc_event_msg_cb != NULL) {
+		rte_intr_enable(pci_dev->intr_handle);
+		ice_dcf_enable_irq0(hw);
+	}
 
 	rte_spinlock_unlock(&hw->vc_cmd_send_lock);
 
@@ -749,6 +753,12 @@ ice_dcf_uninit_hw(struct rte_eth_dev *eth_dev, struct ice_dcf_hw *hw)
 	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(eth_dev);
 	struct rte_intr_handle *intr_handle = pci_dev->intr_handle;
 
+	/* Clear event callbacks, `VIRTCHNL_EVENT_DCF_VSI_MAP_UPDATE`
+	 * event will be ignored and all running `ice-thread` threads
+	 * will exit quickly.
+	 */
+	hw->vc_event_msg_cb = NULL;
+
 	if (hw->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_QOS)
 		if (hw->tm_conf.committed) {
 			ice_dcf_clear_bw(hw);
@@ -760,6 +770,10 @@ ice_dcf_uninit_hw(struct rte_eth_dev *eth_dev, struct ice_dcf_hw *hw)
 	rte_intr_callback_unregister(intr_handle,
 				     ice_dcf_dev_interrupt_handler, hw);
 
+	/* Wait for all `ice-thread` threads to exit. */
+	while (ice_dcf_event_handle_num() > 0)
+		rte_delay_ms(ICE_DCF_ARQ_CHECK_TIME);
+
 	ice_dcf_mode_disable(hw);
 	iavf_shutdown_adminq(&hw->avf);
 
diff --git a/drivers/net/ice/ice_dcf.h b/drivers/net/ice/ice_dcf.h
index 7f42ebabe9..6c636a7497 100644
--- a/drivers/net/ice/ice_dcf.h
+++ b/drivers/net/ice/ice_dcf.h
@@ -143,6 +143,7 @@ int ice_dcf_execute_virtchnl_cmd(struct ice_dcf_hw *hw,
 int ice_dcf_send_aq_cmd(void *dcf_hw, struct ice_aq_desc *desc,
 			void *buf, uint16_t buf_size);
 int ice_dcf_handle_vsi_update_event(struct ice_dcf_hw *hw);
+int ice_dcf_event_handle_num(void);
 int ice_dcf_init_hw(struct rte_eth_dev *eth_dev, struct ice_dcf_hw *hw);
 void ice_dcf_uninit_hw(struct rte_eth_dev *eth_dev, struct ice_dcf_hw *hw);
 int ice_dcf_configure_rss_key(struct ice_dcf_hw *hw);
diff --git a/drivers/net/ice/ice_dcf_parent.c b/drivers/net/ice/ice_dcf_parent.c
index 01e390ddda..0ff08e179e 100644
--- a/drivers/net/ice/ice_dcf_parent.c
+++ b/drivers/net/ice/ice_dcf_parent.c
@@ -14,6 +14,9 @@
 
 #define ICE_DCF_VSI_UPDATE_SERVICE_INTERVAL	100000 /* us */
 static rte_spinlock_t vsi_update_lock = RTE_SPINLOCK_INITIALIZER;
+static rte_spinlock_t vsi_thread_lock = RTE_SPINLOCK_INITIALIZER;
+static int vsi_update_thread_num;
+
 
 struct ice_dcf_reset_event_param {
 	struct ice_dcf_hw *dcf_hw;
@@ -130,6 +133,9 @@ ice_dcf_vsi_update_service_handler(void *param)
 
 	rte_spinlock_lock(&vsi_update_lock);
 
+	if (hw->vc_event_msg_cb == NULL)
+		goto update_end;
+
 	if (!ice_dcf_handle_vsi_update_event(hw)) {
 		__atomic_store_n(&parent_adapter->dcf_state_on, true,
 				 __ATOMIC_RELAXED);
@@ -150,10 +156,14 @@ ice_dcf_vsi_update_service_handler(void *param)
 	if (hw->tm_conf.committed)
 		ice_dcf_replay_vf_bw(hw, reset_param->vf_id);
 
+update_end:
 	rte_spinlock_unlock(&vsi_update_lock);
 
 	free(param);
 
+	rte_spinlock_lock(&vsi_thread_lock);
+	vsi_update_thread_num--;
+	rte_spinlock_unlock(&vsi_thread_lock);
 	return NULL;
 }
 
@@ -183,6 +193,10 @@ start_vsi_reset_thread(struct ice_dcf_hw *dcf_hw, bool vfr, uint16_t vf_id)
 		PMD_DRV_LOG(ERR, "Failed to start the thread for reset handling");
 		free(param);
 	}
+
+	rte_spinlock_lock(&vsi_thread_lock);
+	vsi_update_thread_num++;
+	rte_spinlock_unlock(&vsi_thread_lock);
 }
 
 static uint32_t
@@ -262,6 +276,18 @@ ice_dcf_handle_pf_event_msg(struct ice_dcf_hw *dcf_hw,
 		PMD_DRV_LOG(DEBUG, "VIRTCHNL_EVENT_PF_DRIVER_CLOSE event");
 		break;
 	case VIRTCHNL_EVENT_DCF_VSI_MAP_UPDATE:
+		/* If the event handling callback is empty, the event cannot
+		 * be handled. Therefore we ignore this event.
+		 */
+		if (dcf_hw->vc_event_msg_cb == NULL) {
+			PMD_DRV_LOG(DEBUG,
+				"VIRTCHNL_EVENT_DCF_VSI_MAP_UPDATE event "
+				"received: VF%u with VSI num %u, ignore processing",
+			    pf_msg->event_data.vf_vsi_map.vf_id,
+			    pf_msg->event_data.vf_vsi_map.vsi_id);
+			break;
+		}
+
 		PMD_DRV_LOG(DEBUG, "VIRTCHNL_EVENT_DCF_VSI_MAP_UPDATE event : VF%u with VSI num %u",
 			    pf_msg->event_data.vf_vsi_map.vf_id,
 			    pf_msg->event_data.vf_vsi_map.vsi_id);
@@ -505,3 +531,14 @@ ice_dcf_uninit_parent_adapter(struct rte_eth_dev *eth_dev)
 	ice_flow_uninit(parent_adapter);
 	ice_dcf_uninit_parent_hw(parent_hw);
 }
+
+int ice_dcf_event_handle_num(void)
+{
+	int ret;
+
+	rte_spinlock_lock(&vsi_thread_lock);
+	ret = vsi_update_thread_num;
+	rte_spinlock_unlock(&vsi_thread_lock);
+
+	return ret;
+}
-- 
2.25.1