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From 652a2e3a1ba0db81ae1814e8c3cb989e9e89c4e0 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 22:31:31 +0100
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Subject: [PATCH 02/18] net/virtio: add packed virtqueue helpers
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[ upstream commit e9f4feb7e6225f671b59375aff44b9d576121577 ]
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Add helper functions to set/clear and check descriptor flags.
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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 e9f4feb7e6225f671b59375aff44b9d576121577)
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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 | 6 +++
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drivers/net/virtio/virtqueue.h | 72 ++++++++++++++++++++++++++++++++-
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2 files changed, 76 insertions(+), 2 deletions(-)
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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 4c975a531..b22b62dad 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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@@ -315,6 +315,12 @@ vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
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return (hw->guest_features & (1ULL << bit)) != 0;
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}
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+static inline int
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+vtpci_packed_queue(struct virtio_hw *hw)
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+{
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+ return vtpci_with_feature(hw, VIRTIO_F_RING_PACKED);
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+}
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+
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/*
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* Function declaration from virtio_pci.c
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*/
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diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
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index 1525c7d10..c32812427 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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@@ -251,6 +251,31 @@ struct virtio_tx_region {
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__attribute__((__aligned__(16)));
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};
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+static inline int
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+desc_is_used(struct vring_packed_desc *desc, struct virtqueue *vq)
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+{
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+ uint16_t used, avail, flags;
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+
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+ flags = desc->flags;
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+ used = !!(flags & VRING_DESC_F_USED(1));
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+ avail = !!(flags & VRING_DESC_F_AVAIL(1));
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+
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+ return avail == used && used == vq->used_wrap_counter;
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+}
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+
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+
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+static inline void
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+vring_desc_init_packed(struct virtqueue *vq, int n)
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+{
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+ int i;
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+ for (i = 0; i < n - 1; i++) {
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+ vq->ring_packed.desc_packed[i].id = i;
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+ vq->vq_descx[i].next = i + 1;
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+ }
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+ vq->ring_packed.desc_packed[i].id = i;
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+ vq->vq_descx[i].next = VQ_RING_DESC_CHAIN_END;
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+}
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+
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/* Chain all the descriptors in the ring with an END */
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static inline void
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vring_desc_init(struct vring_desc *dp, uint16_t n)
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@@ -262,13 +287,53 @@ vring_desc_init(struct vring_desc *dp, uint16_t n)
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dp[i].next = VQ_RING_DESC_CHAIN_END;
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}
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+/**
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+ * Tell the backend not to interrupt us.
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+ */
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+static inline void
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+virtqueue_disable_intr_packed(struct virtqueue *vq)
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+{
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+ uint16_t *event_flags = &vq->ring_packed.driver_event->desc_event_flags;
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+
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+ *event_flags = RING_EVENT_FLAGS_DISABLE;
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+}
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+
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+
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/**
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* Tell the backend not to interrupt us.
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*/
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static inline void
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virtqueue_disable_intr(struct virtqueue *vq)
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{
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- vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
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+ if (vtpci_packed_queue(vq->hw))
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+ virtqueue_disable_intr_packed(vq);
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+ else
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+ vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
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+}
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+
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+/**
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+ * Tell the backend to interrupt. Implementation for packed virtqueues.
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+ */
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+static inline void
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+virtqueue_enable_intr_packed(struct virtqueue *vq)
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+{
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+ uint16_t *event_flags = &vq->ring_packed.driver_event->desc_event_flags;
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+
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+
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+ if (vq->event_flags_shadow == RING_EVENT_FLAGS_DISABLE) {
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+ virtio_wmb();
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+ vq->event_flags_shadow = RING_EVENT_FLAGS_ENABLE;
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+ *event_flags = vq->event_flags_shadow;
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+ }
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+}
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+
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+/**
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+ * Tell the backend to interrupt. Implementation for split virtqueues.
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+ */
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+static inline void
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+virtqueue_enable_intr_split(struct virtqueue *vq)
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+{
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+ vq->vq_ring.avail->flags &= (~VRING_AVAIL_F_NO_INTERRUPT);
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}
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/**
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@@ -277,7 +342,10 @@ virtqueue_disable_intr(struct virtqueue *vq)
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static inline void
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virtqueue_enable_intr(struct virtqueue *vq)
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{
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- vq->vq_ring.avail->flags &= (~VRING_AVAIL_F_NO_INTERRUPT);
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+ if (vtpci_packed_queue(vq->hw))
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+ virtqueue_enable_intr_packed(vq);
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+ else
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+ virtqueue_enable_intr_split(vq);
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}
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/**
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--
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2.21.0
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