needs_teardown is a device flag that indicates when virtual queues need
to be recreated. This happens for certain configuration changes: queue
size and some specific features.
Currently, the needs_teardown state can be incorrectly reset by
subsequent .set_vq_num() calls. For example, for 1 rx VQ with size 512
and 1 tx VQ with size 256:
.set_vq_num(0, 512) -> sets needs_teardown to true (rx queue has a
non-default size)
.set_vq_num(1, 256) -> sets needs_teardown to false (tx queue has a
default size)
This change takes into account the previous value of the needs_teardown
flag when re-calculating it during VQ size configuration.
Fixes: 0fe963d6fc16 ("vdpa/mlx5: Re-create HW VQs under certain conditions")
Signed-off-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
Reviewed-by: Shahar Shitrit <shshitrit@xxxxxxxxxx>
Reviewed-by: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
Tested-by: Si-Wei Liu<si-wei.liu@xxxxxxxxxx>
---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index cccc49a08a1a..efb5fa694f1e 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2491,7 +2491,7 @@ static void mlx5_vdpa_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num)
}
mvq = &ndev->vqs[idx];
- ndev->needs_teardown = num != mvq->num_ent;
+ ndev->needs_teardown |= num != mvq->num_ent;
mvq->num_ent = num;
}
--
2.43.0
