[PATCH v5] net/ice: fix crash on closing representor ports

[Mingjin Ye]

The data resource in struct rte_eth_dev is cleared and points to NULL
when the DCF port is closed.

If the DCF representor port is closed after the DCF port is closed,
a segmentation fault occurs because the representor port accesses the
data resource released by the DCF port.

This patch fixes this issue by synchronizing the state of DCF ports and
representor ports to the peer in real time when their state changes.

Fixes: 5674465a32c8 ("net/ice: add DCF VLAN handling")
Fixes: da9cdcd1f372 ("net/ice: fix crash on representor port closing")
Fixes: 7564d5509611 ("net/ice: add DCF hardware initialization")
Fixes: c7e1a1a3bfeb ("net/ice: refactor DCF VLAN handling")
Fixes: 1a86f4dbdf42 ("net/ice: support DCF device reset")
Cc: stable at dpdk.org

Signed-off-by: Mingjin Ye <mingjinx.ye at intel.com>
---
v2: Reformat code to remove unneeded fixlines.
---
v3: New solution.
---
v4: Optimize v2 patch.
---
v5: optimization.
---
 drivers/net/ice/ice_dcf_ethdev.c         | 30 ++++++++++++--
 drivers/net/ice/ice_dcf_ethdev.h         |  3 ++
 drivers/net/ice/ice_dcf_vf_representor.c | 50 ++++++++++++++++++++++--
 3 files changed, 77 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ice/ice_dcf_ethdev.c b/drivers/net/ice/ice_dcf_ethdev.c
index 065ec728c2..eea24ee3a9 100644
--- a/drivers/net/ice/ice_dcf_ethdev.c
+++ b/drivers/net/ice/ice_dcf_ethdev.c
@@ -1618,6 +1618,26 @@ ice_dcf_free_repr_info(struct ice_dcf_adapter *dcf_adapter)
 	}
 }
 
+int
+ice_dcf_handle_vf_repr_close(struct ice_dcf_adapter *dcf_adapter,
+				uint16_t vf_id)
+{
+	struct ice_dcf_repr_info *vf_rep_info;
+
+	if (dcf_adapter->num_reprs >= vf_id) {
+		PMD_DRV_LOG(ERR, "Invalid VF id: %d", vf_id);
+		return -1;
+	}
+
+	if (!dcf_adapter->repr_infos)
+		return 0;
+
+	vf_rep_info = &dcf_adapter->repr_infos[vf_id];
+	vf_rep_info->vf_rep_eth_dev = NULL;
+
+	return 0;
+}
+
 static int
 ice_dcf_init_repr_info(struct ice_dcf_adapter *dcf_adapter)
 {
@@ -1641,11 +1661,10 @@ ice_dcf_dev_close(struct rte_eth_dev *dev)
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return 0;
 
+	ice_dcf_vf_repr_notify_all(adapter, false);
 	(void)ice_dcf_dev_stop(dev);
 
 	ice_free_queues(dev);
-
-	ice_dcf_free_repr_info(adapter);
 	ice_dcf_uninit_parent_adapter(dev);
 	ice_dcf_uninit_hw(dev, &adapter->real_hw);
 
@@ -1835,7 +1854,7 @@ ice_dcf_dev_reset(struct rte_eth_dev *dev)
 		ice_dcf_reset_hw(dev, hw);
 	}
 
-	ret = ice_dcf_dev_uninit(dev);
+	ret = ice_dcf_dev_close(dev);
 	if (ret)
 		return ret;
 
@@ -1938,12 +1957,17 @@ ice_dcf_dev_init(struct rte_eth_dev *eth_dev)
 	}
 
 	dcf_config_promisc(adapter, false, false);
+	ice_dcf_vf_repr_notify_all(adapter, true);
+
 	return 0;
 }
 
 static int
 ice_dcf_dev_uninit(struct rte_eth_dev *eth_dev)
 {
+	struct ice_dcf_adapter *adapter = eth_dev->data->dev_private;
+
+	ice_dcf_free_repr_info(adapter);
 	ice_dcf_dev_close(eth_dev);
 
 	return 0;
diff --git a/drivers/net/ice/ice_dcf_ethdev.h b/drivers/net/ice/ice_dcf_ethdev.h
index 4baaec4b8b..6dcbaac5eb 100644
--- a/drivers/net/ice/ice_dcf_ethdev.h
+++ b/drivers/net/ice/ice_dcf_ethdev.h
@@ -60,6 +60,7 @@ struct ice_dcf_vf_repr {
 	struct rte_ether_addr mac_addr;
 	uint16_t switch_domain_id;
 	uint16_t vf_id;
+	bool dcf_valid;
 
 	struct ice_dcf_vlan outer_vlan_info; /* DCF always handle outer VLAN */
 };
@@ -80,6 +81,8 @@ int ice_dcf_vf_repr_init(struct rte_eth_dev *vf_rep_eth_dev, void *init_param);
 int ice_dcf_vf_repr_uninit(struct rte_eth_dev *vf_rep_eth_dev);
 int ice_dcf_vf_repr_init_vlan(struct rte_eth_dev *vf_rep_eth_dev);
 void ice_dcf_vf_repr_stop_all(struct ice_dcf_adapter *dcf_adapter);
+void ice_dcf_vf_repr_notify_all(struct ice_dcf_adapter *dcf_adapter, bool valid);
+int ice_dcf_handle_vf_repr_close(struct ice_dcf_adapter *dcf_adapter, uint16_t vf_id);
 bool ice_dcf_adminq_need_retry(struct ice_adapter *ad);
 
 #endif /* _ICE_DCF_ETHDEV_H_ */
diff --git a/drivers/net/ice/ice_dcf_vf_representor.c b/drivers/net/ice/ice_dcf_vf_representor.c
index b9fcfc80ad..6c342798ac 100644
--- a/drivers/net/ice/ice_dcf_vf_representor.c
+++ b/drivers/net/ice/ice_dcf_vf_representor.c
@@ -50,9 +50,32 @@ ice_dcf_vf_repr_dev_stop(struct rte_eth_dev *dev)
 	return 0;
 }
 
+static bool
+ice_dcf_vf_repr_set_dcf_valid(struct rte_eth_dev *dev, bool valid)
+{
+	struct ice_dcf_vf_repr *repr = dev->data->dev_private;
+
+	if (!repr)
+		return false;
+
+	repr->dcf_valid = valid;
+
+	return true;
+}
+
 static int
 ice_dcf_vf_repr_dev_close(struct rte_eth_dev *dev)
 {
+	struct ice_dcf_vf_repr *repr = dev->data->dev_private;
+	struct ice_dcf_adapter *dcf_adapter;
+
+	if (repr->dcf_valid) {
+		dcf_adapter = repr->dcf_eth_dev->data->dev_private;
+		ice_dcf_handle_vf_repr_close(dcf_adapter, repr->vf_id);
+		/* Commitment to not access DCF port resources */
+		repr->dcf_valid = false;
+	}
+
 	return ice_dcf_vf_repr_uninit(dev);
 }
 
@@ -111,14 +134,15 @@ ice_dcf_vf_repr_link_update(__rte_unused struct rte_eth_dev *ethdev,
 static __rte_always_inline struct ice_dcf_hw *
 ice_dcf_vf_repr_hw(struct ice_dcf_vf_repr *repr)
 {
-	struct ice_dcf_adapter *dcf_adapter =
-			repr->dcf_eth_dev->data->dev_private;
+	struct ice_dcf_adapter *dcf_adapter;
 
-	if (!dcf_adapter) {
+	if (!repr->dcf_valid) {
 		PMD_DRV_LOG(ERR, "DCF for VF representor has been released\n");
 		return NULL;
 	}
 
+	dcf_adapter = repr->dcf_eth_dev->data->dev_private;
+
 	return &dcf_adapter->real_hw;
 }
 
@@ -414,6 +438,7 @@ ice_dcf_vf_repr_init(struct rte_eth_dev *vf_rep_eth_dev, void *init_param)
 	repr->dcf_eth_dev = param->dcf_eth_dev;
 	repr->switch_domain_id = param->switch_domain_id;
 	repr->vf_id = param->vf_id;
+	repr->dcf_valid = true;
 	repr->outer_vlan_info.port_vlan_ena = false;
 	repr->outer_vlan_info.stripping_ena = false;
 	repr->outer_vlan_info.tpid = RTE_ETHER_TYPE_VLAN;
@@ -488,3 +513,22 @@ ice_dcf_vf_repr_stop_all(struct ice_dcf_adapter *dcf_adapter)
 			vf_rep_eth_dev->data->dev_started = 0;
 	}
 }
+
+void
+ice_dcf_vf_repr_notify_all(struct ice_dcf_adapter *dcf_adapter, bool valid)
+{
+	uint16_t vf_id;
+	struct rte_eth_dev *vf_rep_eth_dev;
+
+	if (!dcf_adapter->repr_infos)
+		return;
+
+	for (vf_id = 0; vf_id < dcf_adapter->real_hw.num_vfs; vf_id++) {
+		vf_rep_eth_dev = dcf_adapter->repr_infos[vf_id].vf_rep_eth_dev;
+
+		if (!vf_rep_eth_dev)
+			continue;
+
+		ice_dcf_vf_repr_set_dcf_valid(vf_rep_eth_dev, valid);
+	}
+}
-- 
2.25.1