[PATCH 02/21] net/virtio: introduce notify callback for control queue

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This patch introduces a notification callback for the control
virtqueue as preliminary work to add shadow control virtqueue
support.

This new callback is required so that the shadow control queue
implemented in Virtio-user does not call the notifciation op
implemented for the driver layer.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
---
 drivers/net/virtio/virtio_cvq.c    | 4 ++--
 drivers/net/virtio/virtio_cvq.h    | 4 ++++
 drivers/net/virtio/virtio_ethdev.c | 7 +++++++
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_cvq.c b/drivers/net/virtio/virtio_cvq.c
index de4299a2a7..cd25614df8 100644
--- a/drivers/net/virtio/virtio_cvq.c
+++ b/drivers/net/virtio/virtio_cvq.c
@@ -76,7 +76,7 @@ virtio_send_command_packed(struct virtnet_ctl *cvq,
 			vq->hw->weak_barriers);
 
 	virtio_wmb(vq->hw->weak_barriers);
-	virtqueue_notify(vq);
+	cvq->notify_queue(vq, cvq->notify_cookie);
 
 	/* wait for used desc in virtqueue
 	 * desc_is_used has a load-acquire or rte_io_rmb inside
@@ -155,7 +155,7 @@ virtio_send_command_split(struct virtnet_ctl *cvq,
 
 	PMD_INIT_LOG(DEBUG, "vq->vq_queue_index = %d", vq->vq_queue_index);
 
-	virtqueue_notify(vq);
+	cvq->notify_queue(vq, cvq->notify_cookie);
 
 	while (virtqueue_nused(vq) == 0)
 		usleep(100);
diff --git a/drivers/net/virtio/virtio_cvq.h b/drivers/net/virtio/virtio_cvq.h
index 139e813ffb..224dc81422 100644
--- a/drivers/net/virtio/virtio_cvq.h
+++ b/drivers/net/virtio/virtio_cvq.h
@@ -7,6 +7,8 @@
 
 #include <rte_ether.h>
 
+struct virtqueue;
+
 /**
  * Control the RX mode, ie. promiscuous, allmulti, etc...
  * All commands require an "out" sg entry containing a 1 byte
@@ -110,6 +112,8 @@ struct virtnet_ctl {
 	uint16_t port_id;               /**< Device port identifier. */
 	const struct rte_memzone *mz;   /**< mem zone to populate CTL ring. */
 	rte_spinlock_t lock;              /**< spinlock for control queue. */
+	void (*notify_queue)(struct virtqueue *vq, void *cookie); /**< notify ops. */
+	void *notify_cookie;              /**< cookie for notify ops */
 };
 
 #define VIRTIO_MAX_CTRL_DATA 2048
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index d3aa420c89..422c597c2b 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -253,6 +253,12 @@ virtio_init_vring(struct virtqueue *vq)
 	virtqueue_disable_intr(vq);
 }
 
+static void
+virtio_control_queue_notify(struct virtqueue *vq, __rte_unused void *cookie)
+{
+	virtqueue_notify(vq);
+}
+
 static int
 virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx)
 {
@@ -421,6 +427,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx)
 		memset(cvq->virtio_net_hdr_mz->addr, 0, rte_mem_page_size());
 
 		hw->cvq = cvq;
+		vq->cq.notify_queue = &virtio_control_queue_notify;
 	}
 
 	if (hw->use_va)
-- 
2.39.1