[dpdk-dev] [PATCH v2 2/3] net/mlx5: use Netlink to enable promisc / all multicast mode

[Nelio Laranjeiro]

VF devices are not able to receive promisc or allmulti traffic unless it
fully requests it though Netlink.  This will cause the request to be
processed by the PF which will handle the request and enable it.

This requires the VF to be trusted by the PF.

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
---
 drivers/net/mlx5/mlx5_nl.c     | 94 ++++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_rxmode.c |  8 ++++
 2 files changed, 102 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_nl.c b/drivers/net/mlx5/mlx5_nl.c
index 21edefc0f..562d219fa 100644
--- a/drivers/net/mlx5/mlx5_nl.c
+++ b/drivers/net/mlx5/mlx5_nl.c
@@ -527,3 +527,97 @@ mlx5_nl_mac_addr_flush(struct rte_eth_dev *dev)
 			mlx5_nl_mac_addr_remove(dev, m);
 	}
 }
+
+/**
+ * Enable promiscuous / all multicast mode through Netlink.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param flags
+ *   IFF_PROMISC for promiscuous, IFF_ALLMULTI for allmulti.
+ * @param enable
+ *   Nonzero to enable, disable otherwise.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+static int
+mlx5_nl_device_flags(struct rte_eth_dev *dev, uint32_t flags, int enable)
+{
+	struct priv *priv = dev->data->dev_private;
+	int iface_idx = mlx5_ifindex(dev);
+	struct {
+		struct nlmsghdr hdr;
+		struct ifinfomsg ifi;
+	} req = {
+		.hdr = {
+			.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+			.nlmsg_type = RTM_NEWLINK,
+			.nlmsg_flags = NLM_F_REQUEST,
+		},
+		.ifi = {
+			.ifi_flags = enable ? flags : 0,
+			.ifi_change = flags,
+			.ifi_index = iface_idx,
+		},
+	};
+	int fd;
+	int ret;
+
+	assert(!(flags & ~(IFF_PROMISC | IFF_ALLMULTI)));
+	if (priv->nl_socket < 0)
+		return 0;
+	fd = priv->nl_socket;
+	ret = mlx5_nl_send(fd, &req.hdr, priv->nl_sn++);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+/**
+ * Enable promiscuous mode through Netlink.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param enable
+ *   Nonzero to enable, disable otherwise.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_nl_promisc(struct rte_eth_dev *dev, int enable)
+{
+	int ret = mlx5_nl_device_flags(dev, IFF_PROMISC, enable);
+
+	if (ret)
+		DRV_LOG(DEBUG,
+			"port %u cannot %s promisc mode: Netlink error %s",
+			dev->data->port_id, enable ? "enable" : "disable",
+			strerror(rte_errno));
+	return ret;
+}
+
+/**
+ * Enable all multicast mode through Netlink.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param enable
+ *   Nonzero to enable, disable otherwise.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_nl_allmulti(struct rte_eth_dev *dev, int enable)
+{
+	int ret = mlx5_nl_device_flags(dev, IFF_ALLMULTI, enable);
+
+	if (ret)
+		DRV_LOG(DEBUG,
+			"port %u cannot %s allmulti mode: Netlink error %s",
+			dev->data->port_id, enable ? "enable" : "disable",
+			strerror(rte_errno));
+	return ret;
+}
diff --git a/drivers/net/mlx5/mlx5_rxmode.c b/drivers/net/mlx5/mlx5_rxmode.c
index e43a4b030..c1c0f21c7 100644
--- a/drivers/net/mlx5/mlx5_rxmode.c
+++ b/drivers/net/mlx5/mlx5_rxmode.c
@@ -35,6 +35,8 @@ mlx5_promiscuous_enable(struct rte_eth_dev *dev)
 	int ret;
 
 	dev->data->promiscuous = 1;
+	if (((struct priv *)dev->data->dev_private)->config.vf)
+		mlx5_nl_promisc(dev, 1);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
 		DRV_LOG(ERR, "port %u cannot enable promiscuous mode: %s",
@@ -53,6 +55,8 @@ mlx5_promiscuous_disable(struct rte_eth_dev *dev)
 	int ret;
 
 	dev->data->promiscuous = 0;
+	if (((struct priv *)dev->data->dev_private)->config.vf)
+		mlx5_nl_promisc(dev, 0);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
 		DRV_LOG(ERR, "port %u cannot disable promiscuous mode: %s",
@@ -71,6 +75,8 @@ mlx5_allmulticast_enable(struct rte_eth_dev *dev)
 	int ret;
 
 	dev->data->all_multicast = 1;
+	if (((struct priv *)dev->data->dev_private)->config.vf)
+		mlx5_nl_allmulti(dev, 1);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
 		DRV_LOG(ERR, "port %u cannot enable allmulicast mode: %s",
@@ -89,6 +95,8 @@ mlx5_allmulticast_disable(struct rte_eth_dev *dev)
 	int ret;
 
 	dev->data->all_multicast = 0;
+	if (((struct priv *)dev->data->dev_private)->config.vf)
+		mlx5_nl_allmulti(dev, 0);
 	ret = mlx5_traffic_restart(dev);
 	if (ret)
 		DRV_LOG(ERR, "port %u cannot disable allmulicast mode: %s",
-- 
2.11.0