Subject: [net-next 11/15] net/mlx5: Skip HotPlug check on sync reset using hot reset

From: Saeed Mahameed <[email-masked]>
Date: Wed, 11 Sep 2024 13:17:53 -0700

From: Moshe Shemesh <[email-masked]>

Sync reset request is nacked by the driver when PCIe bridge connected to
mlx5 device has HotPlug interrupt enabled. However, when using reset
method of hot reset this check can be skipped as Hotplug is supported on
this reset method.

Signed-off-by: Moshe Shemesh <[email-masked]>
Signed-off-by: Saeed Mahameed <[email-masked]>
---
 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
index bda74cb9c975..4f55e55ecb55 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -412,7 +412,8 @@ static int mlx5_check_dev_ids(struct mlx5_core_dev *dev, u16 dev_id)
 	return 0;
 }
 
-static bool mlx5_is_reset_now_capable(struct mlx5_core_dev *dev)
+static bool mlx5_is_reset_now_capable(struct mlx5_core_dev *dev,
+				      u8 reset_method)
 {
 	u16 dev_id;
 	int err;
@@ -423,9 +424,11 @@ static bool mlx5_is_reset_now_capable(struct mlx5_core_dev *dev)
 	}
 
 #if IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE)
-	err = mlx5_check_hotplug_interrupt(dev);
-	if (err)
-		return false;
+	if (reset_method != MLX5_MFRL_REG_PCI_RESET_METHOD_HOT_RESET) {
+		err = mlx5_check_hotplug_interrupt(dev);
+		if (err)
+			return false;
+	}
 #endif
 
 	err = pci_read_config_word(dev->pdev, PCI_DEVICE_ID, &dev_id);
@@ -446,7 +449,7 @@ static void mlx5_sync_reset_request_event(struct work_struct *work)
 		mlx5_core_warn(dev, "Failed reading MFRL, err %d\n", err);
 
 	if (err || test_bit(MLX5_FW_RESET_FLAGS_NACK_RESET_REQUEST, &fw_reset->reset_flags) ||
-	    !mlx5_is_reset_now_capable(dev)) {
+	    !mlx5_is_reset_now_capable(dev, fw_reset->reset_method)) {
 		err = mlx5_fw_reset_set_reset_sync_nack(dev);
 		mlx5_core_warn(dev, "PCI Sync FW Update Reset Nack %s",
 			       err ? "Failed" : "Sent");
-- 
2.46.0