[PATCH v2 net-next] mlx5: Add ndo_poll_controller() implementation

[Calvin Owens]

This implements ndo_poll_controller in net_device_ops callbacks for mlx5,
which is necessary to use netconsole with this driver.

Acked-By: Saeed Mahameed <sae...@mellanox.com>
Signed-off-by: Calvin Owens <calvinow...@fb.com>
---
Changes in v2:
        * Only iterate channels to avoid redundant napi_schedule() calls

drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c 
b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index b58cfe3..7eaf380 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3188,6 +3188,20 @@ static int mlx5e_xdp(struct net_device *dev, struct 
netdev_xdp *xdp)
        }
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Fake "interrupt" called by netpoll (eg netconsole) to send skbs without
+ * reenabling interrupts.
+ */
+static void mlx5e_netpoll(struct net_device *dev)
+{
+       struct mlx5e_priv *priv = netdev_priv(dev);
+       int i;
+
+       for (i = 0; i < priv->params.num_channels; i++)
+               napi_schedule(&priv->channel[i]->napi);
+}
+#endif
+
 static const struct net_device_ops mlx5e_netdev_ops_basic = {
        .ndo_open                = mlx5e_open,
        .ndo_stop                = mlx5e_close,
@@ -3208,6 +3222,9 @@ static const struct net_device_ops mlx5e_netdev_ops_basic 
= {
 #endif
        .ndo_tx_timeout          = mlx5e_tx_timeout,
        .ndo_xdp                 = mlx5e_xdp,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+       .ndo_poll_controller     = mlx5e_netpoll,
+#endif
 };
 
 static const struct net_device_ops mlx5e_netdev_ops_sriov = {
@@ -3240,6 +3257,9 @@ static const struct net_device_ops mlx5e_netdev_ops_sriov 
= {
        .ndo_get_vf_stats        = mlx5e_get_vf_stats,
        .ndo_tx_timeout          = mlx5e_tx_timeout,
        .ndo_xdp                 = mlx5e_xdp,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+       .ndo_poll_controller     = mlx5e_netpoll,
+#endif
 };
 
 static int mlx5e_check_required_hca_cap(struct mlx5_core_dev *mdev)
-- 
2.9.3