[PATCH v13 20/42] virtio_ring: packed: extract the logic of vring init
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-07-26 07:24:06
Also in:
bpf, kvm, linux-remoteproc, linux-s390, linux-um, platform-driver-x86, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Separate the logic of initializing vring, and subsequent patches will call it separately. This function completes the variable initialization of packed vring. It together with the logic of atatch constitutes the initialization of vring. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/virtio/virtio_ring.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 32590d763c3b..fc4e3db9f93b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -1935,6 +1935,22 @@ static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_p return -ENOMEM; } +static void virtqueue_vring_init_packed(struct vring_virtqueue_packed *vring_packed, + bool callback) +{ + vring_packed->next_avail_idx = 0; + vring_packed->avail_wrap_counter = 1; + vring_packed->event_flags_shadow = 0; + vring_packed->avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL; + + /* No callback? Tell other side not to bother us. */ + if (!callback) { + vring_packed->event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE; + vring_packed->vring.driver->flags = + cpu_to_le16(vring_packed->event_flags_shadow); + } +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num,
@@ -1984,11 +2000,6 @@ static struct virtqueue *vring_create_virtqueue_packed( vq->packed.vring = vring_packed.vring; - vq->packed.next_avail_idx = 0; - vq->packed.avail_wrap_counter = 1; - vq->packed.event_flags_shadow = 0; - vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL; - err = vring_alloc_state_extra_packed(&vring_packed); if (err) goto err_state_extra;
@@ -1996,12 +2007,7 @@ static struct virtqueue *vring_create_virtqueue_packed( vq->packed.desc_state = vring_packed.desc_state; vq->packed.desc_extra = vring_packed.desc_extra; - /* No callback? Tell other side not to bother us. */ - if (!callback) { - vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE; - vq->packed.vring.driver->flags = - cpu_to_le16(vq->packed.event_flags_shadow); - } + virtqueue_vring_init_packed(&vring_packed, !!callback); virtqueue_init(vq, num);
--
2.31.0