Sasha Levin
2022-Jul-06 15:30 UTC
[PATCH AUTOSEL 5.18 03/22] vdpa/mlx5: Initialize CVQ vringh only once
From: Eli Cohen <elic at nvidia.com>
[ Upstream commit ace9252446ec615cd79a5f77d90edb25c0b9d024 ]
Currently, CVQ vringh is initialized inside setup_virtqueues() which is
called every time a memory update is done. This is undesirable since it
resets all the context of the vring, including the available and used
indices.
Move the initialization to mlx5_vdpa_set_status() when
VIRTIO_CONFIG_S_DRIVER_OK is set.
Signed-off-by: Eli Cohen <elic at nvidia.com>
Message-Id: <20220613075958.511064-2-elic at nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Acked-by: Jason Wang <jasowang at redhat.com>
Acked-by: Eugenio P?rez <eperezma at redhat.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index e0de44000d92..2baab94bf806 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1963,7 +1963,6 @@ static int verify_driver_features(struct mlx5_vdpa_dev
*mvdev, u64 features)
static int setup_virtqueues(struct mlx5_vdpa_dev *mvdev)
{
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_control_vq *cvq = &mvdev->cvq;
int err;
int i;
@@ -1973,16 +1972,6 @@ static int setup_virtqueues(struct mlx5_vdpa_dev *mvdev)
goto err_vq;
}
- if (mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)) {
- err = vringh_init_iotlb(&cvq->vring, mvdev->actual_features,
- MLX5_CVQ_MAX_ENT, false,
- (struct vring_desc *)(uintptr_t)cvq->desc_addr,
- (struct vring_avail *)(uintptr_t)cvq->driver_addr,
- (struct vring_used *)(uintptr_t)cvq->device_addr);
- if (err)
- goto err_vq;
- }
-
return 0;
err_vq:
@@ -2255,6 +2244,21 @@ static void clear_vqs_ready(struct mlx5_vdpa_net *ndev)
ndev->mvdev.cvq.ready = false;
}
+static int setup_cvq_vring(struct mlx5_vdpa_dev *mvdev)
+{
+ struct mlx5_control_vq *cvq = &mvdev->cvq;
+ int err = 0;
+
+ if (mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
+ err = vringh_init_iotlb(&cvq->vring, mvdev->actual_features,
+ MLX5_CVQ_MAX_ENT, false,
+ (struct vring_desc *)(uintptr_t)cvq->desc_addr,
+ (struct vring_avail *)(uintptr_t)cvq->driver_addr,
+ (struct vring_used *)(uintptr_t)cvq->device_addr);
+
+ return err;
+}
+
static void mlx5_vdpa_set_status(struct vdpa_device *vdev, u8 status)
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
@@ -2267,6 +2271,11 @@ static void mlx5_vdpa_set_status(struct vdpa_device
*vdev, u8 status)
if ((status ^ ndev->mvdev.status) & VIRTIO_CONFIG_S_DRIVER_OK) {
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
+ err = setup_cvq_vring(mvdev);
+ if (err) {
+ mlx5_vdpa_warn(mvdev, "failed to setup control VQ vring\n");
+ goto err_setup;
+ }
err = setup_driver(mvdev);
if (err) {
mlx5_vdpa_warn(mvdev, "failed to setup driver\n");
--
2.35.1