netdev - [PATCH v2 1/3] vdpa/mlx5: update mlx_features with driver state check

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Message-ID: <20251229071614.779621-1-lulu@redhat.com>
Date: Mon, 29 Dec 2025 15:16:12 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	mst@...hat.com,
	jasowang@...hat.com,
	dtatulea@...dia.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH v2 1/3] vdpa/mlx5: update mlx_features with driver state check

Add logic in mlx5_vdpa_set_attr() to ensure the VIRTIO_NET_F_MAC
feature bit is properly set only when the device is not yet in
the DRIVER_OK (running) state.

This makes the MAC address visible in the output of:

 vdpa dev config show -jp

when the device is created without an initial MAC address.

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index ddaa1366704b..6e42bae7c9a1 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -4049,7 +4049,7 @@ static int mlx5_vdpa_set_attr(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
-	int err = -EOPNOTSUPP;
+	int err = 0;
 
 	mvdev = to_mvdev(dev);
 	ndev = to_mlx5_vdpa_ndev(mvdev);
@@ -4057,13 +4057,22 @@ static int mlx5_vdpa_set_attr(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
 	config = &ndev->config;
 
 	down_write(&ndev->reslock);
-	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
+
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
+		if (!(ndev->mvdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+			ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_MAC);
+		} else {
+			mlx5_vdpa_warn(mvdev, "device running, skip updating MAC\n");
+			err = -EBUSY;
+			goto out;
+		}
 		pfmdev = pci_get_drvdata(pci_physfn(mdev->pdev));
 		err = mlx5_mpfs_add_mac(pfmdev, config->mac);
 		if (!err)
 			ether_addr_copy(config->mac, add_config->net.mac);
 	}
 
+out:
 	up_write(&ndev->reslock);
 	return err;
 }
-- 
2.45.0