[dpdk-dev] [PATCH 1/2] net/mlx5: preserve promisc flag for flow isolation mode

[Yongseok Koh <yskoh@mellanox.com>]

mlx5_dev_ops_isolate doesn't have APIs for enabling/disabling promiscuous
mode as it can't be enabled in flow isolation mode. If the function
pointers are null, librte APIs such as rte_eth_promiscuous_enable/disable()
fail to set the flag (dev->data->promiscuous). The flag is used when
starting traffic by mlx5_traffic_enable(). When switching out of flow
isolation mode, promiscuous mode will not be set even though it has been
enabled.

Fixes: 0887aa7f27f3 ("net/mlx5: add new operations for isolated mode")
Cc: stable@dpdk.org

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
---

v2:
* do not toggle promisc mode when switching flow isolation mode
* add warning message when attempting to enable promisc in flow isolation mode

 drivers/net/mlx5/mlx5.c        |  2 ++
 drivers/net/mlx5/mlx5_rxmode.c | 13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index e3e2a181ac..83b82f11ab 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -399,6 +399,8 @@ const struct eth_dev_ops mlx5_dev_ops_isolate = {
 	.dev_set_link_down = mlx5_set_link_down,
 	.dev_set_link_up = mlx5_set_link_up,
 	.dev_close = mlx5_dev_close,
+	.promiscuous_enable = mlx5_promiscuous_enable,
+	.promiscuous_disable = mlx5_promiscuous_disable,
 	.link_update = mlx5_link_update,
 	.stats_get = mlx5_stats_get,
 	.stats_reset = mlx5_stats_reset,
diff --git a/drivers/net/mlx5/mlx5_rxmode.c b/drivers/net/mlx5/mlx5_rxmode.c
index 80824bc43b..3c0373bb4d 100644
--- a/drivers/net/mlx5/mlx5_rxmode.c
+++ b/drivers/net/mlx5/mlx5_rxmode.c
@@ -32,10 +32,18 @@
 void
 mlx5_promiscuous_enable(struct rte_eth_dev *dev)
 {
+	struct priv *priv = dev->data->dev_private;
 	int ret;
 
 	dev->data->promiscuous = 1;
-	if (((struct priv *)dev->data->dev_private)->config.vf)
+	if (priv->isolated) {
+		DRV_LOG(WARNING,
+			"port %u cannot enable promiscuous mode"
+			" in flow isolation mode",
+			dev->data->port_id);
+		return;
+	}
+	if (priv->config.vf)
 		mlx5_nl_promisc(dev, 1);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
@@ -52,10 +60,11 @@ mlx5_promiscuous_enable(struct rte_eth_dev *dev)
 void
 mlx5_promiscuous_disable(struct rte_eth_dev *dev)
 {
+	struct priv *priv = dev->data->dev_private;
 	int ret;
 
 	dev->data->promiscuous = 0;
-	if (((struct priv *)dev->data->dev_private)->config.vf)
+	if (priv->config.vf)
 		mlx5_nl_promisc(dev, 0);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
-- 
2.11.0