[dpdk-stable] [DPDK] net/i40e: fix modifying the number of queues

[alvinx.zhang@intel.com]

From: Alvin Zhang <alvinx.zhang@intel.com>

For a VF, if the number of requested qps is greater than that has been
allocated by the kernel driver) at startup, it may fail to start. This
patch updates the API `i40evf_dev_configure`.

Fixes: c48eb308ed13 ("net/i40e: support VF request more queues")
Cc: stable@dpdk.org

Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---

V2: Update git log and modify codes according to comments.
---
 drivers/net/i40e/i40e_ethdev_vf.c | 47 +++++++++++++++++++++++++++------------
 1 file changed, 33 insertions(+), 14 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index eca716a..8634464 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -90,6 +90,7 @@ static int i40evf_dev_xstats_get_names(struct rte_eth_dev *dev,
 static int i40evf_vlan_filter_set(struct rte_eth_dev *dev,
 				  uint16_t vlan_id, int on);
 static int i40evf_vlan_offload_set(struct rte_eth_dev *dev, int mask);
+static void i40evf_dev_release(struct rte_eth_dev *dev);
 static void i40evf_dev_close(struct rte_eth_dev *dev);
 static int  i40evf_dev_reset(struct rte_eth_dev *dev);
 static int i40evf_dev_promiscuous_enable(struct rte_eth_dev *dev);
@@ -1080,13 +1081,10 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
 	args.out_buffer = vf->aq_resp;
 	args.out_size = I40E_AQ_BUF_SZ;
 
-	rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
 	err = i40evf_execute_vf_cmd(dev, &args);
 	if (err)
 		PMD_DRV_LOG(ERR, "fail to execute command OP_REQUEST_QUEUES");
 
-	rte_eal_alarm_set(I40EVF_ALARM_INTERVAL,
-			  i40evf_dev_alarm_handler, dev);
 	return err;
 }
 
@@ -1514,7 +1512,7 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
 	hw->bus.device = pci_dev->addr.devid;
 	hw->bus.func = pci_dev->addr.function;
 	hw->hw_addr = (void *)pci_dev->mem_resource[0].addr;
-	hw->adapter_stopped = 0;
+	hw->adapter_stopped = 1;
 	hw->adapter_closed = 0;
 
 	/* Pass the information to the rte_eth_dev_close() that it should also
@@ -1610,16 +1608,29 @@ static int eth_i40evf_pci_remove(struct rte_pci_device *pci_dev)
 	ad->tx_vec_allowed = true;
 
 	if (num_queue_pairs > vf->vsi_res->num_queue_pairs) {
-		int ret = 0;
+		struct i40e_hw *hw;
+		int ret;
 
+		hw  = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
 		PMD_DRV_LOG(INFO, "change queue pairs from %u to %u",
 			    vf->vsi_res->num_queue_pairs, num_queue_pairs);
+		if (hw->adapter_stopped == 0) {
+			PMD_DRV_LOG(WARNING, "Device must be stopped first!");
+			return -EINVAL;
+		}
+
+		rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
 		ret = i40evf_request_queues(dev, num_queue_pairs);
-		if (ret != 0)
+		if (ret)
 			return ret;
 
-		ret = i40evf_dev_reset(dev);
-		if (ret != 0)
+		/*
+		 * The device has been reseted after queue resources changed
+		 * and must be reinitiated.
+		 */
+		i40evf_dev_release(dev);
+		ret = i40evf_dev_init(dev);
+		if (ret)
 			return ret;
 	}
 
@@ -2356,10 +2367,7 @@ static int eth_i40evf_pci_remove(struct rte_pci_device *pci_dev)
 i40evf_dev_close(struct rte_eth_dev *dev)
 {
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
-	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
-
 	i40evf_dev_stop(dev);
-	i40e_dev_free_queues(dev);
 	/*
 	 * disable promiscuous mode before reset vf
 	 * it is a workaround solution when work with kernel driver
@@ -2370,19 +2378,30 @@ static int eth_i40evf_pci_remove(struct rte_pci_device *pci_dev)
 	rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
 
 	i40evf_reset_vf(dev);
-	i40e_shutdown_adminq(hw);
-	i40evf_disable_irq0(hw);
+	i40evf_dev_release(dev);
 
 	dev->dev_ops = NULL;
 	dev->rx_pkt_burst = NULL;
 	dev->tx_pkt_burst = NULL;
 
+	hw->adapter_closed = 1;
+}
+
+static void
+i40evf_dev_release(struct rte_eth_dev *dev)
+{
+	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+
+	i40e_shutdown_adminq(hw);
+	i40evf_disable_irq0(hw);
+
 	rte_free(vf->vf_res);
 	vf->vf_res = NULL;
 	rte_free(vf->aq_resp);
 	vf->aq_resp = NULL;
 
-	hw->adapter_closed = 1;
+	i40e_dev_free_queues(dev);
 }
 
 /*
-- 
1.8.3.1