diff mbox series

[net-next,v4,03/15] virtio_ring: virtqueue_set_dma_premapped() support to disable

Message ID 20240611114147.31320-4-xuanzhuo@linux.alibaba.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series virtio-net: support AF_XDP zero copy | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 873 this patch: 873
netdev/build_tools success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 14 of 14 maintainers
netdev/build_clang success Errors and warnings before: 856 this patch: 856
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 878 this patch: 878
netdev/checkpatch warning WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 23 this patch: 23
netdev/source_inline success Was 0 now: 0

Commit Message

Xuan Zhuo June 11, 2024, 11:41 a.m. UTC 
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@linux.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 mbox series

Patch

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 79e313de1566..20705311f59a 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);