[PATCH V2] net/mlx5: add support for flows targeting multicast MAC addresses

[Gavin Li <gavinl@nvidia.com>]

Rules for multicast MAC addresses are intended to filter multicast traffic
and are managed through multicast MAC add/remove APIs. In mlx5_dev_spawn
function, devices (PF, VFs, and SFs) retrieve the netdev-configured MAC
addresses via netlink and store them in the PMD device data, which
includes multicast MAC addresses.

Previously, flows for multicast MAC addresses were incorrectly disabled,
causing the multicast MAC add API to stop working. As a result, multicast
traffic directed to those multicast MAC addresses was not received.

To resolve this and update the multicast MAC address rules, create them
within mlx5_traffic_enable.

Fixes: 2d0665a7f771 ("net/mlx5: align PF and VF/SF MAC address handling")
Cc: stable@dpdk.org

Signed-off-by: Gavin Li <gavinl@nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_os.c | 3 +++
 drivers/net/mlx5/mlx5.h          | 1 +
 drivers/net/mlx5/mlx5_trigger.c  | 5 ++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index 696a3e12c7..b8d75a97e7 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -3216,6 +3216,7 @@ mlx5_os_mac_addr_remove(struct rte_eth_dev *dev, uint32_t index)
 		mlx5_nl_mac_addr_remove(priv->nl_socket_route,
 					mlx5_ifindex(dev), priv->mac_own,
 					&dev->data->mac_addrs[index], index);
+	BITFIELD_RESET(priv->mac_pmd, index);
 }
 
 /**
@@ -3243,6 +3244,8 @@ mlx5_os_mac_addr_add(struct rte_eth_dev *dev, struct rte_ether_addr *mac,
 		ret = mlx5_nl_mac_addr_add(priv->nl_socket_route,
 					   mlx5_ifindex(dev), priv->mac_own,
 					   mac, index);
+	if (!ret)
+		BITFIELD_SET(priv->mac_pmd, index);
 	return ret;
 }
 
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index c08894cd03..50ed46540c 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -1976,6 +1976,7 @@ struct mlx5_priv {
 	struct rte_pci_device *pci_dev; /* Backend PCI device. */
 	struct rte_ether_addr mac[MLX5_MAX_MAC_ADDRESSES]; /* MAC addresses. */
 	BITFIELD_DECLARE(mac_own, uint64_t, MLX5_MAX_MAC_ADDRESSES);
+	BITFIELD_DECLARE(mac_pmd, uint64_t, MLX5_MAX_MAC_ADDRESSES);
 	/* Bit-field of MAC addresses owned by the PMD. */
 	uint16_t vlan_filter[MLX5_MAX_VLAN_IDS]; /* VLAN filters table. */
 	unsigned int vlan_filter_n; /* Number of configured VLAN filters. */
diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index 6c6f228afd..cbc91be3b1 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -1813,7 +1813,10 @@ mlx5_traffic_enable(struct rte_eth_dev *dev)
 	for (i = 0; i != MLX5_MAX_MAC_ADDRESSES; ++i) {
 		struct rte_ether_addr *mac = &dev->data->mac_addrs[i];
 
-		if (!memcmp(mac, &cmp, sizeof(*mac)) || rte_is_multicast_ether_addr(mac))
+		/* Add flows for unicast and multicast mac addresses added by API. */
+		if (!memcmp(mac, &cmp, sizeof(*mac)) ||
+		    !BITFIELD_ISSET(priv->mac_pmd, i) ||
+		    (dev->data->all_multicast && rte_is_multicast_ether_addr(mac)))
 			continue;
 		memcpy(&unicast.hdr.dst_addr.addr_bytes,
 		       mac->addr_bytes,
-- 
2.34.1