Sasha Levin
2023-Aug-29 13:31 UTC
[PATCH AUTOSEL 6.4 05/17] vdpa/mlx5: Correct default number of queues when MQ is on
From: Dragos Tatulea <dtatulea at nvidia.com> [ Upstream commit 3fe024193340b225d1fd410d78c495434a9d68e0 ] The standard specifies that the initial number of queues is the default, which is 1 (1 tx, 1 rx). Signed-off-by: Dragos Tatulea <dtatulea at nvidia.com> Reviewed-by: Eugenio P?rez <eperezma at redhat.com> Message-Id: <20230727172354.68243-2-dtatulea at nvidia.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Acked-by: Jason Wang <jasowang at redhat.com> Tested-by: Lei Yang <leiyang at redhat.com> Signed-off-by: Sasha Levin <sashal at kernel.org> --- drivers/vdpa/mlx5/net/mlx5_vnet.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index 279ac6a558d29..93a2520223b66 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -2447,7 +2447,15 @@ static int mlx5_vdpa_set_driver_features(struct vdpa_device *vdev, u64 features) else ndev->rqt_size = 1; - ndev->cur_num_vqs = 2 * ndev->rqt_size; + /* Device must start with 1 queue pair, as per VIRTIO v1.2 spec, section + * 5.1.6.5.5 "Device operation in multiqueue mode": + * + * Multiqueue is disabled by default. + * The driver enables multiqueue by sending a command using class + * VIRTIO_NET_CTRL_MQ. The command selects the mode of multiqueue + * operation, as follows: ... + */ + ndev->cur_num_vqs = 2; update_cvq_info(mvdev); return err; -- 2.40.1