linux-kernel - [PATCH 03/19] virtio_ring: unify logic of virtqueue_poll() and more

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Message-ID: <20250324054333.1954-4-jasowang@redhat.com>
Date: Mon, 24 Mar 2025 13:43:17 +0800
From: Jason Wang <jasowang@...hat.com>
To: mst@...hat.com,
	jasowang@...hat.com
Cc: xuanzhuo@...ux.alibaba.com,
	eperezma@...hat.com,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/19] virtio_ring: unify logic of virtqueue_poll() and more_used()

This patch unifies the logic of virtqueue_poll() and more_used() for
better code reusing and ease the future in order implementation.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/virtio/virtio_ring.c | 48 +++++++++++++++---------------------
 1 file changed, 20 insertions(+), 28 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1c6b63812bf8..9172f3a089a0 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -802,12 +802,18 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
 	}
 }
 
-static bool more_used_split(const struct vring_virtqueue *vq)
+static bool virtqueue_poll_split(const struct vring_virtqueue *vq,
+				 unsigned int last_used_idx)
 {
-	return vq->last_used_idx != virtio16_to_cpu(vq->vq.vdev,
+	return (u16)last_used_idx != virtio16_to_cpu(vq->vq.vdev,
 			vq->split.vring.used->idx);
 }
 
+static bool more_used_split(const struct vring_virtqueue *vq)
+{
+	return virtqueue_poll_split(vq, vq->last_used_idx);
+}
+
 static void *virtqueue_get_buf_ctx_split(struct virtqueue *_vq,
 					 unsigned int *len,
 					 void **ctx)
@@ -915,13 +921,6 @@ static unsigned int virtqueue_enable_cb_prepare_split(struct virtqueue *_vq)
 	return last_used_idx;
 }
 
-static bool virtqueue_poll_split(struct vring_virtqueue *vq,
-				 unsigned int last_used_idx)
-{
-	return (u16)last_used_idx != virtio16_to_cpu(vq->vq.vdev,
-			vq->split.vring.used->idx);
-}
-
 static bool virtqueue_enable_cb_delayed_split(struct virtqueue *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
@@ -1711,16 +1710,20 @@ static inline bool is_used_desc_packed(const struct vring_virtqueue *vq,
 	return avail == used && used == used_wrap_counter;
 }
 
-static bool more_used_packed(const struct vring_virtqueue *vq)
+static bool virtqueue_poll_packed(const struct vring_virtqueue *vq, u16 off_wrap)
 {
-	u16 last_used;
-	u16 last_used_idx;
-	bool used_wrap_counter;
+	bool wrap_counter;
+	u16 used_idx;
 
-	last_used_idx = READ_ONCE(vq->last_used_idx);
-	last_used = packed_last_used(last_used_idx);
-	used_wrap_counter = packed_used_wrap_counter(last_used_idx);
-	return is_used_desc_packed(vq, last_used, used_wrap_counter);
+	wrap_counter = off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR;
+	used_idx = off_wrap & ~(1 << VRING_PACKED_EVENT_F_WRAP_CTR);
+
+	return is_used_desc_packed(vq, used_idx, wrap_counter);
+}
+
+static bool more_used_packed(const struct vring_virtqueue *vq)
+{
+	return virtqueue_poll_packed(vq, READ_ONCE(vq->last_used_idx));
 }
 
 static void *virtqueue_get_buf_ctx_packed(struct virtqueue *_vq,
@@ -1844,17 +1847,6 @@ static unsigned int virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq)
 	return vq->last_used_idx;
 }
 
-static bool virtqueue_poll_packed(struct vring_virtqueue *vq, u16 off_wrap)
-{
-	bool wrap_counter;
-	u16 used_idx;
-
-	wrap_counter = off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR;
-	used_idx = off_wrap & ~(1 << VRING_PACKED_EVENT_F_WRAP_CTR);
-
-	return is_used_desc_packed(vq, used_idx, wrap_counter);
-}
-
 static bool virtqueue_enable_cb_delayed_packed(struct virtqueue *_vq)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
-- 
2.42.0