[dpdk-dev] [PATCH 4/9] net/hns3: fix Rx interrupt after reset

["Wei Hu (Xavier)" <huwei013@chinasoftinc.com>]

From: Chengwen Feng <fengchengwen@huawei.com>

Currently, Rx interrupt cannot work normally after reset (such as FLR,
global reset and IMP reset), when running l3fwd-power application based on
hns3 network engine.

The root cause is that the hardware configuration about Rx interrupt does
not recover after reset.

This patch fixes it with the following modification.
1. The internal static function named hns3(vf)_init_ring_with_vector is
   moved from hns3_init_pf to hns3(vf)_init_hardware because
   hns3(vf)_init_hardware is called both in the initialization and the
   RESET_STAGE_DEV_INIT stage of the reset process.
2. The internal static function named hns3(vf)_restore_rx_interrupt is
   added in hns3(vf)_restore_conf, it is used to recover hardware
   configuration about interrupt vectors of rx queues in the
   RESET_STAGE_DEV_INIT stage of the reset process.
3. The internal static function named hns3_dev_all_rx_queue_intr_enable and
   hns3_enable_all_queues are added in hns3(vf)_dev_start(which called in
   the initialization, so after calling the rte_eth_dev_start API
   successfully, the driver is ready to work.
4. The function named hns3_dev_all_rx_queue_intr_enable and
   hns3_enable_all_queues are also added in hns3(vf)_start_service(which
   called in the RESET_STAGE_DEV_INIT stage of the reset process), so after
   start_service, the driver is ready to work.

Note:
1. Because FLR will clear queue's interrupt enable bit hardware
   configuration, so we add calling hns3_dev_all_rx_queue_intr_enable
   to enable interrupt before enabling queues.
2. After finished the initialization, we can enable queues to work by
   calling the internal function named hns3_enable_all_queues.

Fixes: 02a7b55657b2 ("net/hns3: support Rx interrupt")

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Hongbo Zheng <zhenghongbo3@huawei.com>
---
Note:
   Because the patch "net/hns3: support Rx interrupt" was merged into
   DPDK 20.02, so this patch needn't cc stable@dpdk.org.
---
 drivers/net/hns3/hns3_ethdev.c    | 82 +++++++++++++++++++++++++------
 drivers/net/hns3/hns3_ethdev_vf.c | 82 +++++++++++++++++++++++++------
 drivers/net/hns3/hns3_intr.c      |  2 +
 drivers/net/hns3/hns3_rxtx.c      | 27 +++++++++-
 drivers/net/hns3/hns3_rxtx.h      |  2 +
 5 files changed, 162 insertions(+), 33 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index 2d0b78d70..b6997aa03 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -4107,6 +4107,19 @@ hns3_init_hardware(struct hns3_adapter *hns)
 		PMD_INIT_LOG(ERR, "Failed to config gro: %d", ret);
 		goto err_mac_init;
 	}
+
+	/*
+	 * In the initialization clearing the all hardware mapping relationship
+	 * configurations between queues and interrupt vectors is needed, so
+	 * some error caused by the residual configurations, such as the
+	 * unexpected interrupt, can be avoid.
+	 */
+	ret = hns3_init_ring_with_vector(hw);
+	if (ret) {
+		PMD_INIT_LOG(ERR, "Failed to init ring intr vector: %d", ret);
+		goto err_mac_init;
+	}
+
 	return 0;
 
 err_mac_init:
@@ -4185,16 +4198,6 @@ hns3_init_pf(struct rte_eth_dev *eth_dev)
 		goto err_fdir;
 	}
 
-	/*
-	 * In the initialization clearing the all hardware mapping relationship
-	 * configurations between queues and interrupt vectors is needed, so
-	 * some error caused by the residual configurations, such as the
-	 * unexpected interrupt, can be avoid.
-	 */
-	ret = hns3_init_ring_with_vector(hw);
-	if (ret)
-		goto err_fdir;
-
 	return 0;
 
 err_fdir:
@@ -4339,6 +4342,31 @@ hns3_map_rx_interrupt(struct rte_eth_dev *dev)
 	return ret;
 }
 
+static int
+hns3_restore_rx_interrupt(struct hns3_hw *hw)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[hw->data->port_id];
+	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
+	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
+	uint16_t q_id;
+	int ret;
+
+	if (dev->data->dev_conf.intr_conf.rxq == 0)
+		return 0;
+
+	if (rte_intr_dp_is_en(intr_handle)) {
+		for (q_id = 0; q_id < hw->used_rx_queues; q_id++) {
+			ret = hns3_bind_ring_with_vector(hw,
+					intr_handle->intr_vec[q_id], true,
+					HNS3_RING_TYPE_RX, q_id);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
 static void
 hns3_restore_filter(struct rte_eth_dev *dev)
 {
@@ -4365,19 +4393,30 @@ hns3_dev_start(struct rte_eth_dev *dev)
 		rte_spinlock_unlock(&hw->lock);
 		return ret;
 	}
+	ret = hns3_map_rx_interrupt(dev);
+	if (ret) {
+		hw->adapter_state = HNS3_NIC_CONFIGURED;
+		rte_spinlock_unlock(&hw->lock);
+		return ret;
+	}
 
 	hw->adapter_state = HNS3_NIC_STARTED;
 	rte_spinlock_unlock(&hw->lock);
 
-	ret = hns3_map_rx_interrupt(dev);
-	if (ret)
-		return ret;
 	hns3_set_rxtx_function(dev);
 	hns3_mp_req_start_rxtx(dev);
 	rte_eal_alarm_set(HNS3_SERVICE_INTERVAL, hns3_service_handler, dev);
 
 	hns3_restore_filter(dev);
 
+	/* Enable interrupt of all rx queues before enabling queues */
+	hns3_dev_all_rx_queue_intr_enable(hw, true);
+	/*
+	 * When finished the initialization, enable queues to receive/transmit
+	 * packets.
+	 */
+	hns3_enable_all_queues(hw, true);
+
 	hns3_info(hw, "hns3 dev start successful!");
 	return 0;
 }
@@ -4458,12 +4497,12 @@ hns3_dev_stop(struct rte_eth_dev *dev)
 	rte_spinlock_lock(&hw->lock);
 	if (rte_atomic16_read(&hw->reset.resetting) == 0) {
 		hns3_do_stop(hns);
+		hns3_unmap_rx_interrupt(dev);
 		hns3_dev_release_mbufs(hns);
 		hw->adapter_state = HNS3_NIC_CONFIGURED;
 	}
 	rte_eal_alarm_cancel(hns3_service_handler, dev);
 	rte_spinlock_unlock(&hw->lock);
-	hns3_unmap_rx_interrupt(dev);
 }
 
 static void
@@ -4977,9 +5016,18 @@ hns3_start_service(struct hns3_adapter *hns)
 	eth_dev = &rte_eth_devices[hw->data->port_id];
 	hns3_set_rxtx_function(eth_dev);
 	hns3_mp_req_start_rxtx(eth_dev);
-	if (hw->adapter_state == HNS3_NIC_STARTED)
+	if (hw->adapter_state == HNS3_NIC_STARTED) {
 		hns3_service_handler(eth_dev);
 
+		/* Enable interrupt of all rx queues before enabling queues */
+		hns3_dev_all_rx_queue_intr_enable(hw, true);
+		/*
+		 * When finished the initialization, enable queues to receive
+		 * and transmit packets.
+		 */
+		hns3_enable_all_queues(hw, true);
+	}
+
 	return 0;
 }
 
@@ -5013,6 +5061,10 @@ hns3_restore_conf(struct hns3_adapter *hns)
 	if (ret)
 		goto err_promisc;
 
+	ret = hns3_restore_rx_interrupt(hw);
+	if (ret)
+		goto err_promisc;
+
 	if (hns->hw.adapter_state == HNS3_NIC_STARTED) {
 		ret = hns3_do_start(hns, false);
 		if (ret)
diff --git a/drivers/net/hns3/hns3_ethdev_vf.c b/drivers/net/hns3/hns3_ethdev_vf.c
index 48b074bff..144f2c34b 100644
--- a/drivers/net/hns3/hns3_ethdev_vf.c
+++ b/drivers/net/hns3/hns3_ethdev_vf.c
@@ -1504,6 +1504,18 @@ hns3vf_init_hardware(struct hns3_adapter *hns)
 		goto err_init_hardware;
 	}
 
+	/*
+	 * In the initialization clearing the all hardware mapping relationship
+	 * configurations between queues and interrupt vectors is needed, so
+	 * some error caused by the residual configurations, such as the
+	 * unexpected interrupt, can be avoid.
+	 */
+	ret = hns3vf_init_ring_with_vector(hw);
+	if (ret) {
+		PMD_INIT_LOG(ERR, "Failed to init ring intr vector: %d", ret);
+		goto err_init_hardware;
+	}
+
 	ret = hns3vf_set_alive(hw, true);
 	if (ret) {
 		PMD_INIT_LOG(ERR, "Failed to VF send alive to PF: %d", ret);
@@ -1607,16 +1619,6 @@ hns3vf_init_vf(struct rte_eth_dev *eth_dev)
 
 	hns3_set_default_rss_args(hw);
 
-	/*
-	 * In the initialization clearing the all hardware mapping relationship
-	 * configurations between queues and interrupt vectors is needed, so
-	 * some error caused by the residual configurations, such as the
-	 * unexpected interrupt, can be avoid.
-	 */
-	ret = hns3vf_init_ring_with_vector(hw);
-	if (ret)
-		goto err_get_config;
-
 	return 0;
 
 err_get_config:
@@ -1725,13 +1727,12 @@ hns3vf_dev_stop(struct rte_eth_dev *dev)
 	rte_spinlock_lock(&hw->lock);
 	if (rte_atomic16_read(&hw->reset.resetting) == 0) {
 		hns3vf_do_stop(hns);
+		hns3vf_unmap_rx_interrupt(dev);
 		hns3_dev_release_mbufs(hns);
 		hw->adapter_state = HNS3_NIC_CONFIGURED;
 	}
 	rte_eal_alarm_cancel(hns3vf_service_handler, dev);
 	rte_spinlock_unlock(&hw->lock);
-
-	hns3vf_unmap_rx_interrupt(dev);
 }
 
 static void
@@ -1881,6 +1882,31 @@ hns3vf_map_rx_interrupt(struct rte_eth_dev *dev)
 	return ret;
 }
 
+static int
+hns3vf_restore_rx_interrupt(struct hns3_hw *hw)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[hw->data->port_id];
+	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
+	struct rte_intr_handle *intr_handle = &pci_dev->intr_handle;
+	uint16_t q_id;
+	int ret;
+
+	if (dev->data->dev_conf.intr_conf.rxq == 0)
+		return 0;
+
+	if (rte_intr_dp_is_en(intr_handle)) {
+		for (q_id = 0; q_id < hw->used_rx_queues; q_id++) {
+			ret = hns3vf_bind_ring_with_vector(hw,
+					intr_handle->intr_vec[q_id], true,
+					HNS3_RING_TYPE_RX, q_id);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
 static void
 hns3vf_restore_filter(struct rte_eth_dev *dev)
 {
@@ -1906,18 +1932,29 @@ hns3vf_dev_start(struct rte_eth_dev *dev)
 		rte_spinlock_unlock(&hw->lock);
 		return ret;
 	}
+	ret = hns3vf_map_rx_interrupt(dev);
+	if (ret) {
+		hw->adapter_state = HNS3_NIC_CONFIGURED;
+		rte_spinlock_unlock(&hw->lock);
+		return ret;
+	}
 	hw->adapter_state = HNS3_NIC_STARTED;
 	rte_spinlock_unlock(&hw->lock);
 
-	ret = hns3vf_map_rx_interrupt(dev);
-	if (ret)
-		return ret;
 	hns3_set_rxtx_function(dev);
 	hns3_mp_req_start_rxtx(dev);
 	rte_eal_alarm_set(HNS3VF_SERVICE_INTERVAL, hns3vf_service_handler, dev);
 
 	hns3vf_restore_filter(dev);
 
+	/* Enable interrupt of all rx queues before enabling queues */
+	hns3_dev_all_rx_queue_intr_enable(hw, true);
+	/*
+	 * When finished the initialization, enable queues to receive/transmit
+	 * packets.
+	 */
+	hns3_enable_all_queues(hw, true);
+
 	return ret;
 }
 
@@ -2069,9 +2106,18 @@ hns3vf_start_service(struct hns3_adapter *hns)
 	eth_dev = &rte_eth_devices[hw->data->port_id];
 	hns3_set_rxtx_function(eth_dev);
 	hns3_mp_req_start_rxtx(eth_dev);
-	if (hw->adapter_state == HNS3_NIC_STARTED)
+	if (hw->adapter_state == HNS3_NIC_STARTED) {
 		hns3vf_service_handler(eth_dev);
 
+		/* Enable interrupt of all rx queues before enabling queues */
+		hns3_dev_all_rx_queue_intr_enable(hw, true);
+		/*
+		 * When finished the initialization, enable queues to receive
+		 * and transmit packets.
+		 */
+		hns3_enable_all_queues(hw, true);
+	}
+
 	return 0;
 }
 
@@ -2142,6 +2188,10 @@ hns3vf_restore_conf(struct hns3_adapter *hns)
 	if (ret)
 		goto err_vlan_table;
 
+	ret = hns3vf_restore_rx_interrupt(hw);
+	if (ret)
+		goto err_vlan_table;
+
 	if (hw->adapter_state == HNS3_NIC_STARTED) {
 		ret = hns3vf_do_start(hns, false);
 		if (ret)
diff --git a/drivers/net/hns3/hns3_intr.c b/drivers/net/hns3/hns3_intr.c
index 6c3ebd3ee..9953a1d98 100644
--- a/drivers/net/hns3/hns3_intr.c
+++ b/drivers/net/hns3/hns3_intr.c
@@ -1001,7 +1001,9 @@ hns3_reset_post(struct hns3_adapter *hns)
 		hw->reset.attempts = 0;
 		hw->reset.stats.success_cnt++;
 		hw->reset.stage = RESET_STAGE_NONE;
+		rte_spinlock_lock(&hw->lock);
 		hw->reset.ops->start_service(hns);
+		rte_spinlock_unlock(&hw->lock);
 		gettimeofday(&tv, NULL);
 		timersub(&tv, &hw->reset.start_time, &tv_delta);
 		hns3_warn(hw, "%s reset done fail_cnt:%" PRIx64
diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 0c965b1b8..0728cb182 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -315,7 +315,7 @@ hns3_init_tx_queue_hw(struct hns3_tx_queue *txq)
 		       HNS3_CFG_DESC_NUM(txq->nb_tx_desc));
 }
 
-static void
+void
 hns3_enable_all_queues(struct hns3_hw *hw, bool en)
 {
 	uint16_t nb_rx_q = hw->data->nb_rx_queues;
@@ -543,6 +543,26 @@ hns3_queue_intr_enable(struct hns3_hw *hw, uint16_t queue_id, bool en)
 	hns3_write_dev(hw, addr, value);
 }
 
+/*
+ * Enable all rx queue interrupt when in interrupt rx mode.
+ * This api was called before enable queue rx&tx (in normal start or reset
+ * recover scenes), used to fix hardware rx queue interrupt enable was clear
+ * when FLR.
+ */
+void
+hns3_dev_all_rx_queue_intr_enable(struct hns3_hw *hw, bool en)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[hw->data->port_id];
+	uint16_t nb_rx_q = hw->data->nb_rx_queues;
+	int i;
+
+	if (dev->data->dev_conf.intr_conf.rxq == 0)
+		return;
+
+	for (i = 0; i < nb_rx_q; i++)
+		hns3_queue_intr_enable(hw, i, en);
+}
+
 int
 hns3_dev_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id)
 {
@@ -742,6 +762,10 @@ hns3_start_tx_queues(struct hns3_adapter *hns)
 	hns3_init_tx_ring_tc(hns);
 }
 
+/*
+ * Start all queues.
+ * Note: just init and setup queues, and don't enable queue rx&tx.
+ */
 int
 hns3_start_queues(struct hns3_adapter *hns, bool reset_queue)
 {
@@ -763,7 +787,6 @@ hns3_start_queues(struct hns3_adapter *hns, bool reset_queue)
 	}
 
 	hns3_start_tx_queues(hns);
-	hns3_enable_all_queues(hw, true);
 
 	return 0;
 }
diff --git a/drivers/net/hns3/hns3_rxtx.h b/drivers/net/hns3/hns3_rxtx.h
index 5ba6ee915..771f3c9be 100644
--- a/drivers/net/hns3/hns3_rxtx.h
+++ b/drivers/net/hns3/hns3_rxtx.h
@@ -302,8 +302,10 @@ void hns3_dev_rx_queue_release(void *queue);
 void hns3_dev_tx_queue_release(void *queue);
 void hns3_free_all_queues(struct rte_eth_dev *dev);
 int hns3_reset_all_queues(struct hns3_adapter *hns);
+void hns3_dev_all_rx_queue_intr_enable(struct hns3_hw *hw, bool en);
 int hns3_dev_rx_queue_intr_enable(struct rte_eth_dev *dev, uint16_t queue_id);
 int hns3_dev_rx_queue_intr_disable(struct rte_eth_dev *dev, uint16_t queue_id);
+void hns3_enable_all_queues(struct hns3_hw *hw, bool en);
 int hns3_start_queues(struct hns3_adapter *hns, bool reset_queue);
 int hns3_stop_queues(struct hns3_adapter *hns, bool reset_queue);
 void hns3_dev_release_mbufs(struct hns3_adapter *hns);
-- 
2.23.0