netdev - [PATCH v2 08/12] virtio: queue

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Date:   Thu, 20 Jan 2022 14:42:59 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org
Subject: [PATCH v2 08/12] virtio: queue_reset: add helper

Add helper for virtio queue reset.

* virtio_reset_vq: reset a queue individually
* virtio_enable_resetq: enable a reset queue

In the virtio_reset_vq(), these tasks will be completed:
   1. notify the hardware queue to reset
   2. recycle the buffer from vq
   3. delete the vq

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 include/linux/virtio_config.h | 43 +++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index e50a377c27a0..f84347f4e4ee 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -239,6 +239,49 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
 				      desc);
 }
 
+/**
+ * virtio_reset_vq - reset a queue individually
+ * @vdev: the device
+ * @queue_index: the queue index
+ * @callback: callback to free unused bufs
+ * @data: pass to callback
+ *
+ * returns 0 on success or error status
+ *
+ */
+static inline
+int virtio_reset_vq(struct virtio_device *vdev, u16 queue_index,
+		    vq_reset_callback_t *callback, void *data)
+{
+	if (!vdev->config->reset_vq)
+		return -ENOENT;
+
+	return vdev->config->reset_vq(vdev, queue_index, callback, data);
+}
+
+/**
+ * virtio_enable_resetq - enable a reset queue
+ * @vdev: the device
+ * @queue_index: the queue index
+ * @callback: callback for the virtqueue, NULL for vq that do not need a callback
+ * @name: virtqueue names (mainly for debugging), NULL for vq unused by driver
+ * @ctx: ctx
+ *
+ * returns vq on success or error status
+ *
+ */
+static inline
+struct virtqueue *virtio_enable_resetq(struct virtio_device *vdev,
+				       u16 queue_index, vq_callback_t *callback,
+				       const char *name, const bool *ctx)
+{
+	if (!vdev->config->enable_reset_vq)
+		return ERR_PTR(-ENOENT);
+
+	return vdev->config->enable_reset_vq(vdev, queue_index, callback,
+					     name, ctx);
+}
+
 /**
  * virtio_device_ready - enable vq use in probe function
  * @vdev: the device
-- 
2.31.0