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From: Jason Wang <jasowang@redhat.com>
To: mst@redhat.com, jasowang@redhat.com
Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	jfreimann@redhat.com, wexu@redhat.com, tiwei.bie@intel.com
Subject: [RFC V5 PATCH 6/8] virtio: introduce packed ring defines
Date: Tue, 29 May 2018 10:10:28 +0800	[thread overview]
Message-ID: <1527559830-8133-7-git-send-email-jasowang@redhat.com> (raw)
In-Reply-To: <1527559830-8133-1-git-send-email-jasowang@redhat.com>

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 include/uapi/linux/virtio_config.h |  9 +++++++++
 include/uapi/linux/virtio_ring.h   | 13 +++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 308e209..5903d51 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -71,4 +71,13 @@
  * this is for compatibility with legacy systems.
  */
 #define VIRTIO_F_IOMMU_PLATFORM		33
+
+#define VIRTIO_F_RING_PACKED		34
+
+/*
+ * This feature indicates that all buffers are used by the device in
+ * the same order in which they have been made available.
+ */
+#define VIRTIO_F_IN_ORDER		35
+
 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */
diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 6d5d5fa..e297580 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -43,6 +43,8 @@
 #define VRING_DESC_F_WRITE	2
 /* This means the buffer contains a list of buffer descriptors. */
 #define VRING_DESC_F_INDIRECT	4
+#define VRING_DESC_F_AVAIL      7
+#define VRING_DESC_F_USED	15
 
 /* The Host uses this in used->flags to advise the Guest: don't kick me when
  * you add a buffer.  It's unreliable, so it's simply an optimization.  Guest
@@ -62,6 +64,17 @@
  * at the end of the used ring. Guest should ignore the used->flags field. */
 #define VIRTIO_RING_F_EVENT_IDX		29
 
+struct vring_desc_packed {
+	/* Buffer Address. */
+	__virtio64 addr;
+	/* Buffer Length. */
+	__virtio32 len;
+	/* Buffer ID. */
+	__virtio16 id;
+	/* The flags depending on descriptor type. */
+	__virtio16 flags;
+};
+
 /* Virtio ring descriptors: 16 bytes.  These can chain together via "next". */
 struct vring_desc {
 	/* Address (guest-physical). */
-- 
2.7.4

  parent reply	other threads:[~2018-05-29  2:11 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29  2:10 [RFC V5 PATCH 0/8] Packed ring layout for vhost Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 1/8] vhost: move get_rx_bufs to vhost.c Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 2/8] vhost: hide used ring layout from device Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 3/8] vhost: do not use vring_used_elem Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 4/8] vhost_net: do not explicitly manipulate vhost_used_elem Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 5/8] vhost: vhost_put_user() can accept metadata type Jason Wang
2018-05-29  2:10 ` Jason Wang [this message]
2018-05-29  2:10 ` [RFC V5 PATCH 7/8] vhost: packed ring support Jason Wang
2018-05-29  2:10 ` [RFC V5 PATCH 8/8] vhost: event suppression for packed ring Jason Wang
2018-05-30 11:42   ` Wei Xu
2018-05-31  3:09     ` Jason Wang
2018-06-03 15:40       ` Wei Xu

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