Extend the admin command by incorporating a result size field.
This allows higher layers to determine the actual result size from the
backend when this information is not included in the result_sg.
The additional information introduced here will be used in subsequent
patches of this series.
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxx>
---
drivers/virtio/virtio_pci_modern.c | 4 +++-
include/linux/virtio.h | 1 +
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 9193c30d640a..487d04610ecb 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -64,8 +64,10 @@ void vp_modern_avq_done(struct virtqueue *vq)
spin_lock_irqsave(&admin_vq->lock, flags);
do {
virtqueue_disable_cb(vq);
- while ((cmd = virtqueue_get_buf(vq, &len)))
+ while ((cmd = virtqueue_get_buf(vq, &len))) {
+ cmd->result_sg_size = len;
complete(&cmd->completion);
+ }
} while (!virtqueue_enable_cb(vq));
spin_unlock_irqrestore(&admin_vq->lock, flags);
}
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 306137a15d07..b5f7a611715a 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -111,6 +111,7 @@ struct virtio_admin_cmd {
struct scatterlist *data_sg;
struct scatterlist *result_sg;
struct completion completion;
+ u32 result_sg_size;
int ret;
};
--
2.27.0
