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From 93f21370ca38ae61dc2d938adf569f6668381c32 Mon Sep 17 00:00:00 2001
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From: Jens Freimann <jfreimann@redhat.com>
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Date: Mon, 17 Dec 2018 22:31:30 +0100
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Subject: [PATCH 01/18] net/virtio: add packed virtqueue defines
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[ upstream commit 4c3f5822eb21476fbbd807a7c40584c1090695e5 ]
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Signed-off-by: Jens Freimann <jfreimann@redhat.com>
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Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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(cherry picked from commit 4c3f5822eb21476fbbd807a7c40584c1090695e5)
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Signed-off-by: Jens Freimann <jfreimann@redhat.com>
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---
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drivers/net/virtio/virtio_pci.h | 1 +
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drivers/net/virtio/virtio_ring.h | 30 ++++++++++++++++++++++++++++++
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drivers/net/virtio/virtqueue.h | 6 ++++++
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3 files changed, 37 insertions(+)
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diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
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index e961a58ca..4c975a531 100644
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--- a/drivers/net/virtio/virtio_pci.h
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+++ b/drivers/net/virtio/virtio_pci.h
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@@ -113,6 +113,7 @@ struct virtnet_ctl;
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#define VIRTIO_F_VERSION_1 32
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#define VIRTIO_F_IOMMU_PLATFORM 33
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+#define VIRTIO_F_RING_PACKED 34
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/*
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* Some VirtIO feature bits (currently bits 28 through 31) are
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diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
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index 9e3c2a015..464449074 100644
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--- a/drivers/net/virtio/virtio_ring.h
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+++ b/drivers/net/virtio/virtio_ring.h
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@@ -15,6 +15,10 @@
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#define VRING_DESC_F_WRITE 2
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/* This means the buffer contains a list of buffer descriptors. */
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#define VRING_DESC_F_INDIRECT 4
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+/* This flag means the descriptor was made available by the driver */
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+#define VRING_DESC_F_AVAIL(b) ((uint16_t)(b) << 7)
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+/* This flag means the descriptor was used by the device */
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+#define VRING_DESC_F_USED(b) ((uint16_t)(b) << 15)
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/* The Host uses this in used->flags to advise the Guest: don't kick me
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* when you add a buffer. It's unreliable, so it's simply an
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@@ -54,6 +58,32 @@ struct vring_used {
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struct vring_used_elem ring[0];
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};
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+/* For support of packed virtqueues in Virtio 1.1 the format of descriptors
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+ * looks like this.
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+ */
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+struct vring_packed_desc {
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+ uint64_t addr;
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+ uint32_t len;
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+ uint16_t id;
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+ uint16_t flags;
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+};
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+
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+#define RING_EVENT_FLAGS_ENABLE 0x0
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+#define RING_EVENT_FLAGS_DISABLE 0x1
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+#define RING_EVENT_FLAGS_DESC 0x2
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+struct vring_packed_desc_event {
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+ uint16_t desc_event_off_wrap;
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+ uint16_t desc_event_flags;
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+};
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+
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+struct vring_packed {
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+ unsigned int num;
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+ struct vring_packed_desc *desc_packed;
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+ struct vring_packed_desc_event *driver_event;
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+ struct vring_packed_desc_event *device_event;
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+
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+};
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+
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struct vring {
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unsigned int num;
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struct vring_desc *desc;
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diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
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index 2e2abf15b..1525c7d10 100644
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--- a/drivers/net/virtio/virtqueue.h
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+++ b/drivers/net/virtio/virtqueue.h
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@@ -161,11 +161,17 @@ struct virtio_pmd_ctrl {
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struct vq_desc_extra {
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void *cookie;
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uint16_t ndescs;
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+ uint16_t next;
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};
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struct virtqueue {
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struct virtio_hw *hw; /**< virtio_hw structure pointer. */
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struct vring vq_ring; /**< vring keeping desc, used and avail */
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+ struct vring_packed ring_packed; /**< vring keeping descs */
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+ bool avail_wrap_counter;
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+ bool used_wrap_counter;
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+ uint16_t event_flags_shadow;
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+ uint16_t avail_used_flags;
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/**
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* Last consumed descriptor in the used table,
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* trails vq_ring.used->idx.
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--
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2.21.0
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