[PATCH v13 19/42] virtio_ring: packed: extract the logic of alloc state and extra
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-07-26 07:23:53
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 for alloc desc_state and desc_extra, which will be called separately by subsequent patches. Use struct vring_packed to pass desc_state, desc_extra. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/virtio/virtio_ring.c | 48 +++++++++++++++++++++++++----------- 1 file changed, 34 insertions(+), 14 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 10cc2b7e3588..32590d763c3b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -1908,6 +1908,33 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed, return -ENOMEM; } +static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_packed) +{ + struct vring_desc_state_packed *state; + struct vring_desc_extra *extra; + u32 num = vring_packed->vring.num; + + state = kmalloc_array(num, sizeof(struct vring_desc_state_packed), GFP_KERNEL); + if (!state) + goto err_desc_state; + + memset(state, 0, num * sizeof(struct vring_desc_state_packed)); + + extra = vring_alloc_desc_extra(num); + if (!extra) + goto err_desc_extra; + + vring_packed->desc_state = state; + vring_packed->desc_extra = extra; + + return 0; + +err_desc_extra: + kfree(state); +err_desc_state: + return -ENOMEM; +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num,
@@ -1922,6 +1949,7 @@ static struct virtqueue *vring_create_virtqueue_packed( { struct vring_virtqueue_packed vring_packed = {}; struct vring_virtqueue *vq; + int err; if (vring_alloc_queue_packed(&vring_packed, vdev, num)) goto err_ring;
@@ -1961,18 +1989,12 @@ static struct virtqueue *vring_create_virtqueue_packed( vq->packed.event_flags_shadow = 0; vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL; - vq->packed.desc_state = kmalloc_array(num, - sizeof(struct vring_desc_state_packed), - GFP_KERNEL); - if (!vq->packed.desc_state) - goto err_desc_state; - - memset(vq->packed.desc_state, 0, - num * sizeof(struct vring_desc_state_packed)); + err = vring_alloc_state_extra_packed(&vring_packed); + if (err) + goto err_state_extra; - vq->packed.desc_extra = vring_alloc_desc_extra(num); - if (!vq->packed.desc_extra) - goto err_desc_extra; + 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) {
@@ -1988,9 +2010,7 @@ static struct virtqueue *vring_create_virtqueue_packed( spin_unlock(&vdev->vqs_list_lock); return &vq->vq; -err_desc_extra: - kfree(vq->packed.desc_state); -err_desc_state: +err_state_extra: kfree(vq); err_vq: vring_free_packed(&vring_packed, vdev);
--
2.31.0