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Message-Id: <20240116075924.42798-3-xuanzhuo@linux.alibaba.com>
Date: Tue, 16 Jan 2024 15:59:21 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	virtualization@...ts.linux.dev,
	bpf@...r.kernel.org
Subject: [PATCH net-next 2/5] virtio_ring: virtqueue_disable_and_recycle let the callback detach bufs

Now, inside virtqueue_disable_and_recycle, the recycle() just has two
parameters(vq, buf) after detach operate.

But if we are in premapped mode, we may need to get some dma info when
detach buf like virtqueue_get_buf_ctx_dma().

So we call recycle directly, this callback detaches bufs self. It should
complete the work of detaching all the unused buffers.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/main.c    | 60 +++++++++++++++++++-----------------
 drivers/virtio/virtio_ring.c | 10 +++---
 include/linux/virtio.h       |  4 +--
 3 files changed, 38 insertions(+), 36 deletions(-)

diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index ac3a529c7729..186b2cf5d8fc 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -150,7 +150,8 @@ struct virtio_net_common_hdr {
 	};
 };
 
-static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
+static void virtnet_rq_free_unused_bufs(struct virtqueue *vq);
+static void virtnet_sq_free_unused_bufs(struct virtqueue *vq);
 
 static bool is_xdp_frame(void *ptr)
 {
@@ -587,20 +588,6 @@ static void virtnet_rq_set_premapped(struct virtnet_info *vi)
 	}
 }
 
-static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
-{
-	struct virtnet_info *vi = vq->vdev->priv;
-	struct virtnet_rq *rq;
-	int i = vq2rxq(vq);
-
-	rq = &vi->rq[i];
-
-	if (rq->do_dma)
-		virtnet_rq_unmap(rq, buf, 0);
-
-	virtnet_rq_free_buf(vi, rq, buf);
-}
-
 static void free_old_xmit(struct virtnet_sq *sq, bool in_napi)
 {
 	u64 bytes = 0, packets = 0;
@@ -2244,7 +2231,7 @@ static int virtnet_rx_resize(struct virtnet_info *vi,
 		cancel_work_sync(&rq->dim.work);
 	}
 
-	err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_unmap_free_buf);
+	err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_bufs);
 	if (err)
 		netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
 
@@ -2283,7 +2270,7 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
 
 	__netif_tx_unlock_bh(txq);
 
-	err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
+	err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_bufs);
 	if (err)
 		netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
 
@@ -4026,31 +4013,48 @@ static void free_receive_page_frags(struct virtnet_info *vi)
 		}
 }
 
-static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
+static void virtnet_sq_free_unused_bufs(struct virtqueue *vq)
 {
-	if (!is_xdp_frame(buf))
-		dev_kfree_skb(buf);
-	else
-		xdp_return_frame(ptr_to_xdp(buf));
+	void *buf;
+
+	while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
+		if (!is_xdp_frame(buf))
+			dev_kfree_skb(buf);
+		else
+			xdp_return_frame(ptr_to_xdp(buf));
+	}
 }
 
-static void free_unused_bufs(struct virtnet_info *vi)
+static void virtnet_rq_free_unused_bufs(struct virtqueue *vq)
 {
+	struct virtnet_info *vi = vq->vdev->priv;
+	struct virtnet_rq *rq;
+	int i = vq2rxq(vq);
 	void *buf;
+
+	rq = &vi->rq[i];
+
+	while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
+		if (rq->do_dma)
+			virtnet_rq_unmap(rq, buf, 0);
+
+		virtnet_rq_free_buf(vi, rq, buf);
+	}
+}
+
+static void free_unused_bufs(struct virtnet_info *vi)
+{
 	int i;
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
 		struct virtqueue *vq = vi->sq[i].vq;
-		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
-			virtnet_sq_free_unused_buf(vq, buf);
+		virtnet_sq_free_unused_bufs(vq);
 		cond_resched();
 	}
 
 	for (i = 0; i < vi->max_queue_pairs; i++) {
 		struct virtqueue *vq = vi->rq[i].vq;
-
-		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
-			virtnet_rq_unmap_free_buf(vq, buf);
+		virtnet_rq_free_unused_bufs(vq);
 		cond_resched();
 	}
 }
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 82f72428605b..ecbaf7568251 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2198,11 +2198,10 @@ static int virtqueue_resize_packed(struct virtqueue *_vq, u32 num)
 }
 
 static int virtqueue_disable_and_recycle(struct virtqueue *_vq,
-					 void (*recycle)(struct virtqueue *vq, void *buf))
+					 void (*recycle)(struct virtqueue *vq))
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
 	struct virtio_device *vdev = vq->vq.vdev;
-	void *buf;
 	int err;
 
 	if (!vq->we_own_ring)
@@ -2218,8 +2217,7 @@ static int virtqueue_disable_and_recycle(struct virtqueue *_vq,
 	if (err)
 		return err;
 
-	while ((buf = virtqueue_detach_unused_buf(_vq)) != NULL)
-		recycle(_vq, buf);
+	recycle(_vq);
 
 	return 0;
 }
@@ -2814,7 +2812,7 @@ EXPORT_SYMBOL_GPL(vring_create_virtqueue_dma);
  *
  */
 int virtqueue_resize(struct virtqueue *_vq, u32 num,
-		     void (*recycle)(struct virtqueue *vq, void *buf))
+		     void (*recycle)(struct virtqueue *vq))
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
 	int err;
@@ -2905,7 +2903,7 @@ EXPORT_SYMBOL_GPL(virtqueue_set_dma_premapped);
  * -EPERM: Operation not permitted
  */
 int virtqueue_reset(struct virtqueue *_vq,
-		    void (*recycle)(struct virtqueue *vq, void *buf))
+		    void (*recycle)(struct virtqueue *vq))
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
 	int err;
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 572aecec205b..7a5e9ea7d420 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -115,9 +115,9 @@ dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *vq);
 dma_addr_t virtqueue_get_used_addr(const struct virtqueue *vq);
 
 int virtqueue_resize(struct virtqueue *vq, u32 num,
-		     void (*recycle)(struct virtqueue *vq, void *buf));
+		     void (*recycle)(struct virtqueue *vq));
 int virtqueue_reset(struct virtqueue *vq,
-		    void (*recycle)(struct virtqueue *vq, void *buf));
+		    void (*recycle)(struct virtqueue *vq));
 
 /**
  * struct virtio_device - representation of a device using virtio
-- 
2.32.0.3.g01195cf9f

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