netdev - [PATCH net-next v5 03/15] virtio_ring: virtqueue_set_dma

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Date: Fri, 14 Jun 2024 14:39:21 +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>,
	Eugenio Pérez <eperezma@...hat.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 v5 03/15] virtio_ring: virtqueue_set_dma_premapped() support to disable

virtio-net sq will only enable premapped mode when sq is bound to
the af-xdp.

So we need the helper (virtqueue_set_dma_premapped) to enable the
premapped mode when af-xdp binds to sq. And to disable the
premapped mode when af-xdp unbinds to sq.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio_net.c     | 2 +-
 drivers/virtio/virtio_ring.c | 7 ++++---
 include/linux/virtio.h       | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 61a57d134544..838b450d9591 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -938,7 +938,7 @@ static void virtnet_rq_set_premapped(struct virtnet_info *vi)
 
 	for (i = 0; i < vi->max_queue_pairs; i++)
 		/* error should never happen */
-		BUG_ON(virtqueue_set_dma_premapped(vi->rq[i].vq));
+		BUG_ON(virtqueue_set_dma_premapped(vi->rq[i].vq, true));
 }
 
 static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index d0d3004a408a..12083a0e6052 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2764,8 +2764,9 @@ EXPORT_SYMBOL_GPL(virtqueue_resize);
 /**
  * virtqueue_set_dma_premapped - set the vring premapped mode
  * @_vq: the struct virtqueue we're talking about.
+ * @premapped: bool enable/disable the premapped mode
  *
- * Enable the premapped mode of the vq.
+ * Enable/disable the premapped mode of the vq.
  *
  * The vring in premapped mode does not do dma internally, so the driver must
  * do dma mapping in advance. The driver must pass the dma_address through
@@ -2782,7 +2783,7 @@ EXPORT_SYMBOL_GPL(virtqueue_resize);
  * 0: success.
  * -EINVAL: too late to enable premapped mode, the vq already contains buffers.
  */
-int virtqueue_set_dma_premapped(struct virtqueue *_vq)
+int virtqueue_set_dma_premapped(struct virtqueue *_vq, bool premapped)
 {
 	struct vring_virtqueue *vq = to_vvq(_vq);
 	u32 num;
@@ -2796,7 +2797,7 @@ int virtqueue_set_dma_premapped(struct virtqueue *_vq)
 		return -EINVAL;
 	}
 
-	vq->premapped = true;
+	vq->premapped = premapped;
 
 	END_USE(vq);
 
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index ca318a66a7e1..69677d02cee9 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -81,7 +81,7 @@ bool virtqueue_enable_cb(struct virtqueue *vq);
 
 unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
 
-int virtqueue_set_dma_premapped(struct virtqueue *_vq);
+int virtqueue_set_dma_premapped(struct virtqueue *_vq, bool premapped);
 
 bool virtqueue_poll(struct virtqueue *vq, unsigned);
 
-- 
2.32.0.3.g01195cf9f