virtio: explicit enable_cb/disable_cb rather than callback return.
It seems that virtio_net wants to disable callbacks (interrupts) before
calling netif_rx_schedule(), so we can't use the return value to do so.
Rename "restart" to "cb_enable" and introduce "cb_disable" hook: callback
now returns void, rather than a boolean.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 1c63d5b..54a8017 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -36,7 +36,7 @@
struct virtio_blk_inhdr in_hdr;
};
-static bool blk_done(struct virtqueue *vq)
+static void blk_done(struct virtqueue *vq)
{
struct virtio_blk *vblk = vq->vdev->priv;
struct virtblk_req *vbr;
@@ -65,7 +65,6 @@
/* In case queue is stopped waiting for more buffers. */
blk_start_queue(vblk->disk->queue);
spin_unlock_irqrestore(&vblk->lock, flags);
- return true;
}
static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 07f57a5..ced5b44 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -191,7 +191,7 @@
* So we provide devices with a "find virtqueue and set it up" function. */
static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
unsigned index,
- bool (*callback)(struct virtqueue *vq))
+ void (*callback)(struct virtqueue *vq))
{
struct lguest_device *ldev = to_lgdev(vdev);
struct lguest_vq_info *lvq;
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4b81383..7b0059f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -52,13 +52,12 @@
sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr));
}
-static bool skb_xmit_done(struct virtqueue *rvq)
+static void skb_xmit_done(struct virtqueue *rvq)
{
struct virtnet_info *vi = rvq->vdev->priv;
/* In case we were waiting for output buffers. */
netif_wake_queue(vi->dev);
- return true;
}
static void receive_skb(struct net_device *dev, struct sk_buff *skb,
@@ -161,12 +160,14 @@
vi->rvq->vq_ops->kick(vi->rvq);
}
-static bool skb_recv_done(struct virtqueue *rvq)
+static void skb_recv_done(struct virtqueue *rvq)
{
struct virtnet_info *vi = rvq->vdev->priv;
- netif_rx_schedule(vi->dev, &vi->napi);
- /* Suppress further interrupts. */
- return false;
+ /* Schedule NAPI, Suppress further interrupts if successful. */
+ if (netif_rx_schedule_prep(vi->dev, &vi->napi)) {
+ rvq->vq_ops->disable_cb(rvq);
+ __netif_rx_schedule(vi->dev, &vi->napi);
+ }
}
static int virtnet_poll(struct napi_struct *napi, int budget)
@@ -192,7 +193,7 @@
/* Out of packets? */
if (received < budget) {
netif_rx_complete(vi->dev, napi);
- if (unlikely(!vi->rvq->vq_ops->restart(vi->rvq))
+ if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq))
&& netif_rx_reschedule(vi->dev, napi))
goto again;
}
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1dc04b6..342bb03 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -220,7 +220,17 @@
return ret;
}
-static bool vring_restart(struct virtqueue *_vq)
+static void vring_disable_cb(struct virtqueue *_vq)
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+
+ START_USE(vq);
+ BUG_ON(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
+ vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+ END_USE(vq);
+}
+
+static bool vring_enable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@@ -254,8 +264,8 @@
return IRQ_HANDLED;
pr_debug("virtqueue callback for %p (%p)\n", vq, vq->vq.callback);
- if (vq->vq.callback && !vq->vq.callback(&vq->vq))
- vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
+ if (vq->vq.callback)
+ vq->vq.callback(&vq->vq);
return IRQ_HANDLED;
}
@@ -264,7 +274,8 @@
.add_buf = vring_add_buf,
.get_buf = vring_get_buf,
.kick = vring_kick,
- .restart = vring_restart,
+ .disable_cb = vring_disable_cb,
+ .enable_cb = vring_enable_cb,
.shutdown = vring_shutdown,
};
@@ -272,7 +283,7 @@
struct virtio_device *vdev,
void *pages,
void (*notify)(struct virtqueue *),
- bool (*callback)(struct virtqueue *))
+ void (*callback)(struct virtqueue *))
{
struct vring_virtqueue *vq;
unsigned int i;
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 14e1379..951d817 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -11,15 +11,13 @@
/**
* virtqueue - a queue to register buffers for sending or receiving.
* @callback: the function to call when buffers are consumed (can be NULL).
- * If this returns false, callbacks are suppressed until vq_ops->restart
- * is called.
* @vdev: the virtio device this queue was created for.
* @vq_ops: the operations for this virtqueue (see below).
* @priv: a pointer for the virtqueue implementation to use.
*/
struct virtqueue
{
- bool (*callback)(struct virtqueue *vq);
+ void (*callback)(struct virtqueue *vq);
struct virtio_device *vdev;
struct virtqueue_ops *vq_ops;
void *priv;
@@ -41,7 +39,9 @@
* vq: the struct virtqueue we're talking about.
* len: the length written into the buffer
* Returns NULL or the "data" token handed to add_buf.
- * @restart: restart callbacks after callback returned false.
+ * @disable_cb: disable callbacks
+ * vq: the struct virtqueue we're talking about.
+ * @enable_cb: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This returns "false" (and doesn't re-enable) if there are pending
* buffers in the queue, to avoid a race.
@@ -65,7 +65,8 @@
void *(*get_buf)(struct virtqueue *vq, unsigned int *len);
- bool (*restart)(struct virtqueue *vq);
+ void (*disable_cb)(struct virtqueue *vq);
+ bool (*enable_cb)(struct virtqueue *vq);
void (*shutdown)(struct virtqueue *vq);
};
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 70bb260..81f828a 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -61,7 +61,7 @@
void (*set_status)(struct virtio_device *vdev, u8 status);
struct virtqueue *(*find_vq)(struct virtio_device *vdev,
unsigned index,
- bool (*callback)(struct virtqueue *));
+ void (*callback)(struct virtqueue *));
void (*del_vq)(struct virtqueue *vq);
};
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 1a4ed49..8cde10e 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -114,7 +114,7 @@
struct virtio_device *vdev,
void *pages,
void (*notify)(struct virtqueue *vq),
- bool (*callback)(struct virtqueue *vq));
+ void (*callback)(struct virtqueue *vq));
void vring_del_virtqueue(struct virtqueue *vq);
irqreturn_t vring_interrupt(int irq, void *_vq);
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 78d7946..42eea5fe 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -199,14 +199,12 @@
kfree(trans);
}
-static bool p9_virtio_intr(struct virtqueue *q)
+static void p9_virtio_intr(struct virtqueue *q)
{
struct virtio_chan *chan = q->vdev->priv;
P9_DPRINTK(P9_DEBUG_TRANS, "9p poll_wakeup: %p\n", &chan->wq);
wake_up_interruptible(&chan->wq);
-
- return true;
}
static int p9_virtio_probe(struct virtio_device *dev)