[PATCH V2 vhost next 06/10] vdpa: Modify get_vq_state() to return error code

From: Eli Cohen
Date: Mon Jul 20 2020 - 03:54:00 EST


Modify get_vq_state() so it returns an error code. In case of hardware
acceleration, the available index may be retrieved from the device, an
operation that can possibly fail.

Reviewed-by: Parav Pandit <parav@xxxxxxxxxxxx>
Signed-off-by: Eli Cohen <eli@xxxxxxxxxxxx>
---
drivers/vdpa/ifcvf/ifcvf_main.c | 5 +++--
drivers/vdpa/vdpa_sim/vdpa_sim.c | 5 +++--
drivers/vhost/vdpa.c | 5 ++++-
include/linux/vdpa.h | 4 ++--
4 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 69032ee97824..d9b5f465ac81 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -235,12 +235,13 @@ static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
return IFCVF_QUEUE_MAX;
}

-static void ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
- struct vdpa_vq_state *state)
+static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
+ struct vdpa_vq_state *state)
{
struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

state->avail_index = ifcvf_get_vq_state(vf, qid);
+ return 0;
}

static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 599519039f8d..ddf6086d43c2 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -427,14 +427,15 @@ static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
return 0;
}

-static void vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
- struct vdpa_vq_state *state)
+static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
+ struct vdpa_vq_state *state)
{
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
struct vringh *vrh = &vq->vring;

state->avail_index = vrh->last_avail_idx;
+ return 0;
}

static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index af98c11c9d26..fadad74f882e 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -360,7 +360,10 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
}

if (cmd == VHOST_GET_VRING_BASE) {
- ops->get_vq_state(v->vdpa, idx, &vq_state);
+ r = ops->get_vq_state(v->vdpa, idx, &vq_state);
+ if (r)
+ return r;
+
vq->last_avail_idx = vq_state.avail_index;
}

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 7b088bebffe8..000d71a9f988 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -185,8 +185,8 @@ struct vdpa_config_ops {
bool (*get_vq_ready)(struct vdpa_device *vdev, u16 idx);
int (*set_vq_state)(struct vdpa_device *vdev, u16 idx,
const struct vdpa_vq_state *state);
- void (*get_vq_state)(struct vdpa_device *vdev, u16 idx,
- struct vdpa_vq_state *state);
+ int (*get_vq_state)(struct vdpa_device *vdev, u16 idx,
+ struct vdpa_vq_state *state);
struct vdpa_notification_area
(*get_vq_notification)(struct vdpa_device *vdev, u16 idx);

--
2.26.0