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fix(net): detect tap offload cap after setup

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In the TUN/TAP case, the fd must be attached to an interface before
the userspace can enable offloads.

Signed-off-by: Changyuan Lyu <changyuanl@google.com>
This commit is contained in:
Changyuan Lyu 2024-08-18 22:41:22 -07:00 committed by Lencerf
parent 9340c98378
commit 42593bcd26
1 changed files with 2 additions and 2 deletions
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4
alioth/src/virtio/dev/net/net.rs
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@ -186,6 +186,8 @@ fn new_socket(dev_tap: Option<&Path>) -> Result<File> {
impl Net {
pub fn new(param: NetParam, name: Arc<String>) -> Result<Self> {
let mut socket = new_socket(param.tap.as_deref())?;
let max_queue_pairs = param.queue_pairs.map(From::from).unwrap_or(1);
setup_socket(&mut socket, param.if_name.as_deref(), max_queue_pairs > 1)?;
let mut dev_feat = NetFeature::MAC
| NetFeature::MTU
| NetFeature::CSUM
@ -196,11 +198,9 @@ impl Net {
| NetFeature::HOST_USO
| NetFeature::CTRL_VQ
| detect_tap_offload(&socket);
let max_queue_pairs = param.queue_pairs.map(From::from).unwrap_or(1);
if max_queue_pairs > 1 {
dev_feat |= NetFeature::MQ;
}
setup_socket(&mut socket, param.if_name.as_deref(), max_queue_pairs > 1)?;
let net = Net {
name,
config: Arc::new(NetConfig {