[PATCH net v1] mlxbf_gige: disable port during stop()

From: David Thompson
Date: Fri Aug 16 2024 - 16:49:58 EST


The mlxbf_gige_open() routine initializes and enables the
Gigabit Ethernet port from a hardware point of view. The
mlxbf_gige_stop() routine must disable the port hardware
to fully quiesce it.

Fixes: f92e1869d74e ("Add Mellanox BlueField Gigabit Ethernet driver")
Reviewed-by: Asmaa Mnebhi <asmaa@xxxxxxxxxx>
Signed-off-by: David Thompson <davthompson@xxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
index 385a56ac7348..12942a50e1bb 100644
--- a/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
+++ b/drivers/net/ethernet/mellanox/mlxbf_gige/mlxbf_gige_main.c
@@ -205,8 +205,14 @@ static int mlxbf_gige_open(struct net_device *netdev)
static int mlxbf_gige_stop(struct net_device *netdev)
{
struct mlxbf_gige *priv = netdev_priv(netdev);
+ u64 control;
+
+ control = readq(priv->base + MLXBF_GIGE_CONTROL);
+ control &= ~MLXBF_GIGE_CONTROL_PORT_EN;
+ writeq(control, priv->base + MLXBF_GIGE_CONTROL);

writeq(0, priv->base + MLXBF_GIGE_INT_EN);
+ mb();
netif_stop_queue(netdev);
napi_disable(&priv->napi);
netif_napi_del(&priv->napi);
--
2.30.1