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virtio-devices: net: Handle descriptor address translation

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Since we're trying to move away from the translation happening in the
virtio-queue crate, the device itself is performing the address
translation when needed.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2022-01-26 17:12:15 +01:00
committed by Rob Bradford
parent ce984b73f5
commit 4becb11a44
5 changed files with 106 additions and 23 deletions
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45
net_util/src/ctrl_queue.rs
View File

@@ -5,6 +5,7 @@
use crate::GuestMemoryMmap;
use crate::Tap;
use libc::c_uint;
use std::sync::Arc;
use virtio_bindings::bindings::virtio_net::{
VIRTIO_NET_CTRL_GUEST_OFFLOADS, VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, VIRTIO_NET_CTRL_MQ,
VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX, VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN,
@@ -12,8 +13,8 @@ use virtio_bindings::bindings::virtio_net::{
VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
VIRTIO_NET_F_GUEST_UFO, VIRTIO_NET_OK,
};
use virtio_queue::Queue;
use vm_memory::{ByteValued, Bytes, GuestMemoryAtomic, GuestMemoryError};
use virtio_queue::{AccessPlatform, Queue};
use vm_memory::{ByteValued, Bytes, GuestAddress, GuestMemoryAtomic, GuestMemoryError};
#[derive(Debug)]
pub enum Error {
@@ -57,23 +58,55 @@ impl CtrlQueue {
pub fn process(
&mut self,
queue: &mut Queue<GuestMemoryAtomic<GuestMemoryMmap>>,
access_platform: Option<&Arc<dyn AccessPlatform>>,
) -> Result<bool> {
let mut used_desc_heads = Vec::new();
for mut desc_chain in queue.iter().map_err(Error::QueueIterator)? {
let ctrl_desc = desc_chain.next().ok_or(Error::NoControlHeaderDescriptor)?;
let ctrl_desc_addr = if let Some(access_platform) = access_platform {
GuestAddress(
access_platform
.translate(ctrl_desc.addr().0, u64::from(ctrl_desc.len()))
.unwrap(),
)
} else {
ctrl_desc.addr()
};
let ctrl_hdr: ControlHeader = desc_chain
.memory()
.read_obj(ctrl_desc.addr())
.read_obj(ctrl_desc_addr)
.map_err(Error::GuestMemory)?;
let data_desc = desc_chain.next().ok_or(Error::NoDataDescriptor)?;
let data_desc_addr = if let Some(access_platform) = access_platform {
GuestAddress(
access_platform
.translate(data_desc.addr().0, u64::from(data_desc.len()))
.unwrap(),
)
} else {
data_desc.addr()
};
let status_desc = desc_chain.next().ok_or(Error::NoStatusDescriptor)?;
let status_desc_addr = if let Some(access_platform) = access_platform {
GuestAddress(
access_platform
.translate(status_desc.addr().0, u64::from(status_desc.len()))
.unwrap(),
)
} else {
status_desc.addr()
};
let ok = match u32::from(ctrl_hdr.class) {
VIRTIO_NET_CTRL_MQ => {
let queue_pairs = desc_chain
.memory()
.read_obj::<u16>(data_desc.addr())
.read_obj::<u16>(data_desc_addr)
.map_err(Error::GuestMemory)?;
if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET {
warn!("Unsupported command: {}", ctrl_hdr.cmd);
@@ -91,7 +124,7 @@ impl CtrlQueue {
VIRTIO_NET_CTRL_GUEST_OFFLOADS => {
let features = desc_chain
.memory()
.read_obj::<u64>(data_desc.addr())
.read_obj::<u64>(data_desc_addr)
.map_err(Error::GuestMemory)?;
if u32::from(ctrl_hdr.cmd) != VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET {
warn!("Unsupported command: {}", ctrl_hdr.cmd);
@@ -120,7 +153,7 @@ impl CtrlQueue {
.memory()
.write_obj(
if ok { VIRTIO_NET_OK } else { VIRTIO_NET_ERR } as u8,
status_desc.addr(),
status_desc_addr,
)
.map_err(Error::GuestMemory)?;
let len = ctrl_desc.len() + data_desc.len() + status_desc.len();