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net_util: Tolerate some unsupported command classes

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Windows NetKVM driver (>= 0.1.271) issues unsupported command classes
even when they are not even advertised.

According to the Virtio 1.2 specification:

RX, VLAN, and ANNOUNCE control paths are only meaningful when their
corresponding features are negotiated in sections 5.1.3.1, 5.1.6.5.1.2,
5.1.6.5.2.2, and 5.1.6.5.4.1.

RX and VLAN are explicitly described as best-effort in sections
5.1.6.5.1 and 5.1.6.5.3.

Instead of returning an error to the guest, return success to the guest.

Fixes: #7925
Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu
2026-03-31 04:28:41 +00:00
committed by Rob Bradford
parent 8026eb177f
commit c60168256a
1 changed files with 32 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
net_util/src/ctrl_queue.rs
View File

@@ -2,12 +2,16 @@
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use log::{error, info, warn};
use log::{debug, error, info, warn};
use thiserror::Error;
use virtio_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,
VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, VIRTIO_NET_ERR, VIRTIO_NET_OK,
VIRTIO_NET_CTRL_ANNOUNCE, VIRTIO_NET_CTRL_ANNOUNCE_ACK, 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, VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, VIRTIO_NET_CTRL_RX,
VIRTIO_NET_CTRL_RX_ALLMULTI, VIRTIO_NET_CTRL_RX_ALLUNI, VIRTIO_NET_CTRL_RX_NOBCAST,
VIRTIO_NET_CTRL_RX_NOMULTI, VIRTIO_NET_CTRL_RX_NOUNI, VIRTIO_NET_CTRL_RX_PROMISC,
VIRTIO_NET_CTRL_VLAN, VIRTIO_NET_CTRL_VLAN_ADD, VIRTIO_NET_CTRL_VLAN_DEL, VIRTIO_NET_ERR,
VIRTIO_NET_OK,
};
use virtio_queue::{Queue, QueueT};
use vm_memory::{ByteValued, Bytes, GuestMemoryError};
@@ -53,6 +57,26 @@ pub struct ControlHeader {
// SAFETY: ControlHeader only contains a series of integers
unsafe impl ByteValued for ControlHeader {}
fn is_tolerated_ctrl_command(ctrl_hdr: ControlHeader) -> bool {
match u32::from(ctrl_hdr.class) {
VIRTIO_NET_CTRL_RX => matches!(
u32::from(ctrl_hdr.cmd),
VIRTIO_NET_CTRL_RX_PROMISC
| VIRTIO_NET_CTRL_RX_ALLMULTI
| VIRTIO_NET_CTRL_RX_ALLUNI
| VIRTIO_NET_CTRL_RX_NOMULTI
| VIRTIO_NET_CTRL_RX_NOUNI
| VIRTIO_NET_CTRL_RX_NOBCAST
),
VIRTIO_NET_CTRL_VLAN => matches!(
u32::from(ctrl_hdr.cmd),
VIRTIO_NET_CTRL_VLAN_ADD | VIRTIO_NET_CTRL_VLAN_DEL
),
VIRTIO_NET_CTRL_ANNOUNCE => u32::from(ctrl_hdr.cmd) == VIRTIO_NET_CTRL_ANNOUNCE_ACK,
_ => false,
}
}
pub struct CtrlQueue {
pub taps: Vec<Tap>,
}
@@ -128,6 +152,10 @@ impl CtrlQueue {
false
}
}
_ if is_tolerated_ctrl_command(ctrl_hdr) => {
debug!("Ignoring unsupported but tolerated control command {ctrl_hdr:?}");
true
}
_ => {
warn!("Unsupported command {ctrl_hdr:?}");
false