[PATCH] net/iavf: add VF reset check

[PATCH] net/iavf: add VF reset check

[Zhichao Zeng]

This commit adds a VF reset check before the dev_reset, so that
the application can check if the iavf device comes out of reset
when calling the rte_eth_dev_reset.

Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
---
 drivers/net/iavf/iavf_ethdev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index e6cf897293..1cc4540c9d 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -2855,6 +2855,15 @@ static int
 iavf_dev_reset(struct rte_eth_dev *dev)
 {
 	int ret;
+	struct iavf_hw *hw = IAVF_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	ret = iavf_check_vf_reset_done(hw);
+	if (ret) {
+		PMD_DRV_LOG(ERR, "Wait too long for reset done!\n");
+		return ret;
+	}
+
+	PMD_DRV_LOG(DEBUG, "Start dev_reset ...\n");
 
 	ret = iavf_dev_uninit(dev);
 	if (ret)
-- 
2.34.1

[PATCH v2] net/iavf: add VF reset check

[Zhichao Zeng]

In the current implementation, after application calls rte_eth_dev_reset,
it has no way to know if reset has been completed, and if the virtual
channel command is called before it is completed, it may cause the dev to
be abnormal. To avoid this issue, an uncertain delay need to be added.

This commit adds a VF reset check before the dev_reset to inform
the application not to invoke any virtual channel commands, to avoid making
the device to be abnormal.

Suggested-by: Liang-Min Larry Wang <liang-min.wang@intel.com>
Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
---
 drivers/net/iavf/iavf_ethdev.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index e6cf897293..96004220a1 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -2855,7 +2855,20 @@ static int
 iavf_dev_reset(struct rte_eth_dev *dev)
 {
 	int ret;
+	struct iavf_hw *hw = IAVF_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+	/*
+	 * Check whether the VF reset has been done and inform application,
+	 * to avoid calling the virtual channel command, which may cause
+	 * the device to be abnormal.
+	 */
+	ret = iavf_check_vf_reset_done(hw);
+	if (ret) {
+		PMD_DRV_LOG(ERR, "Wait too long for reset done!\n");
+		return ret;
+	}
 
+	PMD_DRV_LOG(DEBUG, "Start dev_reset ...\n");
 	ret = iavf_dev_uninit(dev);
 	if (ret)
 		return ret;
-- 
2.34.1

RE: [PATCH v2] net/iavf: add VF reset check

[Zhang, Qi Z]

> -----Original Message-----
> From: Zeng, ZhichaoX <zhichaox.zeng@intel.com>
> Sent: Friday, June 2, 2023 10:38 AM
> To: dev@dpdk.org
> Cc: Zhang, Qi Z <qi.z.zhang@intel.com>; Zeng, ZhichaoX
> <zhichaox.zeng@intel.com>; Wang, Liang-min <liang-min.wang@intel.com>;
> Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Subject: [PATCH v2] net/iavf: add VF reset check
> 
> In the current implementation, after application calls rte_eth_dev_reset, it
> has no way to know if reset has been completed, and if the virtual channel
> command is called before it is completed, it may cause the dev to be
> abnormal. To avoid this issue, an uncertain delay need to be added.
> 
> This commit adds a VF reset check before the dev_reset to inform the
> application not to invoke any virtual channel commands, to avoid making the
> device to be abnormal.
> 
> Suggested-by: Liang-Min Larry Wang <liang-min.wang@intel.com>
> Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>

Acked-by: Qi Zhang <qi.z.zhang@intel.com>

Applied to dpdk-next-net-intel.

Thanks
Qi