Add support for missing TUN/TAP parameters from Linux kernel#1066
Merged
aboch merged 2 commits intovishvananda:mainfrom Mar 28, 2025
Merged
Add support for missing TUN/TAP parameters from Linux kernel#1066aboch merged 2 commits intovishvananda:mainfrom
aboch merged 2 commits intovishvananda:mainfrom
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Is it possible to test this in an existing or a new UT function? |
Signed-off-by: Ivan Tsvetkov <ivanfromearth@gmail.com>
Introduce AddQueues and RemoveQueues methods for attaching and detaching queue file descriptors to an existing TUN/TAP interface in multi-queue mode. This enables controlled testing of disabled queues and fine-grained queue management without relying on interface recreation. Signed-off-by: Ivan Tsvetkov <ivanfromearth@gmail.com>
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Hi @aboch, Yes — the changes are now covered by both extended and new unit tests. Specifically:
That said, due to time constraints I didn't implement a native test that programmatically triggers non-zero Let me know if any adjustments are needed — happy to follow up. Best regards, |
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The two commits are more or less independent. LGTM |
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Hey folks! This PR fixes TUN/TAP implementation to handle several kernel parameters we've been missing. No rocket science – just closing gaps with well-known features.
What's changed
New field in
TuntapstructDisabledQueuesto track inactive multiqueue slots (critical for live migration in VMs).Now parsing kernel flags
IFLA_TUN_PI→ setsTUNTAP_NO_PI(for "raw" packet mode)IFLA_TUN_VNET_HDR→ setsTUNTAP_VNET_HDR(QEMU/virtio needs this)IFLA_TUN_MULTI_QUEUEsupportIFLA_TUN_NUM_QUEUES/DISABLED_QUEUESWhy this is needed
VNET_HDRor multiqueue configs got silently ignored.DisabledQueuesfor VM migrationsMULTI_QUEUEmatters for anyone using DPDK/VPP for fast packet processingHow I tested
✓ 4 active + 2 disabled queues
✓
VNET_HDRflag (matching QEMU's requirements)✓ Legacy configs (verified old behavior stays intact)
Notes for review
iproute2's implementation (see here) – we're not inventing wheels.Signed-off-by: Ivan Tsvetkov ivanfromearth@gmail.com