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Remove add_buf from VirtQueue

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This commit is contained in:
Jianfeng Jiang
2024-04-29 02:27:14 +00:00
committed by Tate, Hongliang Tian
parent 2256f6ae8a
commit a482c87696
2 changed files with 4 additions and 93 deletions
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88
kernel/comps/virtio/src/queue.rs
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@ -226,77 +226,6 @@ impl VirtQueue {
Ok(head)
}
/// Add buffers to the virtqueue, return a token. **This function will be removed in the future.**
///
/// Ref: linux virtio_ring.c virtqueue_add
pub fn add_buf(&mut self, inputs: &[&[u8]], outputs: &[&mut [u8]]) -> Result<u16, QueueError> {
// FIXME: use `DmaSteam` for inputs and outputs. Now because the upper device driver lacks the
// ability to safely construct DmaStream from slice, slice is still used here.
// pub fn add(
// &mut self,
// inputs: &[&DmaStream],
// outputs: &[&mut DmaStream],
// ) -> Result<u16, QueueError> {
if inputs.is_empty() && outputs.is_empty() {
return Err(QueueError::InvalidArgs);
}
if inputs.len() + outputs.len() + self.num_used as usize > self.queue_size as usize {
return Err(QueueError::BufferTooSmall);
}
// allocate descriptors from free list
let head = self.free_head;
let mut last = self.free_head;
for input in inputs.iter() {
let desc = &self.descs[self.free_head as usize];
set_buf_slice(&desc.borrow_vm().restrict::<TRights![Write, Dup]>(), input);
field_ptr!(desc, Descriptor, flags)
.write(&DescFlags::NEXT)
.unwrap();
last = self.free_head;
self.free_head = field_ptr!(desc, Descriptor, next).read().unwrap();
}
for output in outputs.iter() {
let desc = &mut self.descs[self.free_head as usize];
set_buf_slice(&desc.borrow_vm().restrict::<TRights![Write, Dup]>(), output);
field_ptr!(desc, Descriptor, flags)
.write(&(DescFlags::NEXT | DescFlags::WRITE))
.unwrap();
last = self.free_head;
self.free_head = field_ptr!(desc, Descriptor, next).read().unwrap();
}
// set last_elem.next = NULL
{
let desc = &mut self.descs[last as usize];
let mut flags: DescFlags = field_ptr!(desc, Descriptor, flags).read().unwrap();
flags.remove(DescFlags::NEXT);
field_ptr!(desc, Descriptor, flags).write(&flags).unwrap();
}
self.num_used += (inputs.len() + outputs.len()) as u16;
let avail_slot = self.avail_idx & (self.queue_size - 1);
{
let ring_ptr: SafePtr<[u16; 64], &DmaCoherent> =
field_ptr!(&self.avail, AvailRing, ring);
let mut ring_slot_ptr = ring_ptr.cast::<u16>();
ring_slot_ptr.add(avail_slot as usize);
ring_slot_ptr.write(&head).unwrap();
}
// write barrier
fence(Ordering::SeqCst);
// increase head of avail ring
self.avail_idx = self.avail_idx.wrapping_add(1);
field_ptr!(&self.avail, AvailRing, idx)
.write(&self.avail_idx)
.unwrap();
fence(Ordering::SeqCst);
Ok(head)
}
/// Whether there is a used element that can pop.
pub fn can_pop(&self) -> bool {
// read barrier
@ -421,6 +350,8 @@ type DescriptorPtr<'a> = SafePtr<Descriptor, &'a DmaCoherent, TRightSet<TRights!
#[inline]
fn set_dma_buf<T: DmaBuf>(desc_ptr: &DescriptorPtr, buf: &T) {
// TODO: skip the empty dma buffer or just return error?
debug_assert_ne!(buf.len(), 0);
let daddr = buf.daddr();
field_ptr!(desc_ptr, Descriptor, addr)
.write(&(daddr as u64))
@ -430,21 +361,6 @@ fn set_dma_buf<T: DmaBuf>(desc_ptr: &DescriptorPtr, buf: &T) {
.unwrap();
}
#[inline]
#[allow(clippy::type_complexity)]
fn set_buf_slice(desc_ptr: &DescriptorPtr, buf: &[u8]) {
// FIXME: use `DmaSteam` for buf. Now because the upper device driver lacks the
// ability to safely construct DmaStream from slice, slice is still used here.
let va = buf.as_ptr() as usize;
let pa = aster_frame::vm::vaddr_to_paddr(va).unwrap();
field_ptr!(desc_ptr, Descriptor, addr)
.write(&(pa as u64))
.unwrap();
field_ptr!(desc_ptr, Descriptor, len)
.write(&(buf.len() as u32))
.unwrap();
}
bitflags! {
/// Descriptor flags
#[derive(Pod, Default)]