linux-kernel - [PATCH] mlx5: Add ndo_poll_controller() implementation

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Message-ID: <a1f1b99a1f13786722f9d30636173ad1a5b5b5ad.1474661274.git.calvinowens@fb.com>
Date:   Fri, 23 Sep 2016 13:13:23 -0700
From:   Calvin Owens <calvinowens@...com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel-team@...com>, Calvin Owens <calvinowens@...com>
Subject: [PATCH] mlx5: Add ndo_poll_controller() implementation

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

Signed-off-by: Calvin Owens <calvinowens@...com>
---
 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 2459c7f..439476f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -2786,6 +2786,20 @@ static void mlx5e_tx_timeout(struct net_device *dev)
 		schedule_work(&priv->tx_timeout_work);
 }
 
+#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, nr_sq = priv->params.num_channels * priv->params.num_tc;
+
+	for (i = 0; i < nr_sq; i++)
+		napi_schedule(priv->txq_to_sq_map[i]->cq.napi);
+}
+#endif
+
 static const struct net_device_ops mlx5e_netdev_ops_basic = {
 	.ndo_open                = mlx5e_open,
 	.ndo_stop                = mlx5e_close,
@@ -2805,6 +2819,9 @@ static const struct net_device_ops mlx5e_netdev_ops_basic = {
 	.ndo_rx_flow_steer	 = mlx5e_rx_flow_steer,
 #endif
 	.ndo_tx_timeout          = mlx5e_tx_timeout,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller     = mlx5e_netpoll,
+#endif
 };
 
 static const struct net_device_ops mlx5e_netdev_ops_sriov = {
@@ -2836,6 +2853,9 @@ static const struct net_device_ops mlx5e_netdev_ops_sriov = {
 	.ndo_set_vf_link_state   = mlx5e_set_vf_link_state,
 	.ndo_get_vf_stats        = mlx5e_get_vf_stats,
 	.ndo_tx_timeout          = mlx5e_tx_timeout,
+#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