This series implements multiqueue support for vhost-user mode, allowing passt to utilize multiple queue pairs. There is no improved network performance because we keep using only one thread. The implementation introduces a --max-queues parameter to configure up to 16 queue pairs (32 virtqueues) in vhost-user mode. Packets are routed to the appropriate RX queue based on which TX queue they originated from, enabling the guest kernel to distribute network traffic across multiple queues and vCPUs. This series adds: - configuration support for multiqueue via --max-queues parameter - queue parameter threading throughout the network stack - a significant refactoring that propagates queue information through all protocol handlers (TCP, UDP, ICMP, ARP, DHCP, DHCPv6, NDP) - flow-aware queue routing that matches RX queue selection to the incoming TX queue, maintaining proper packet affinity - comprehensive test coverage with VHOST_USER_MQ environment variable to validate multiqueue functionality across all test scenarios Current behavior: TX queue selection is controlled by the guest kernel, while RX packets are routed to queues based on their associated flows. Host-initiated flows currently default to queue 0. The RX queue of a flow is updated on each new packet from the TX queue to maintain affinity. The changes maintain backward compatibility - without --max-queues, behavior remains unchanged with single-queue operation. Laurent Vivier (4): vhost-user: Enable multiqueue vhost-user: Add queue parameter throughout the network stack multiqueue: Add queue-aware flow management for multiqueue support test: Add multiqueue support to vhost-user test infrastructure arp.c | 12 ++--- arp.h | 4 +- conf.c | 31 ++++++++++++- dhcp.c | 5 ++- dhcp.h | 2 +- dhcpv6.c | 12 ++--- dhcpv6.h | 2 +- flow.c | 32 +++++++++++++ flow.h | 10 +++++ fwd.c | 4 +- icmp.c | 25 ++++++----- icmp.h | 2 +- ndp.c | 32 +++++++------ ndp.h | 5 ++- passt.h | 2 + tap.c | 120 +++++++++++++++++++++++++++++-------------------- tap.h | 18 ++++---- tcp.c | 82 ++++++++++++++++++--------------- tcp.h | 11 ++--- tcp_vu.c | 8 ++-- test/lib/setup | 60 +++++++++++++++++++------ test/run | 23 ++++++++++ udp.c | 40 ++++++++++------- udp.h | 12 ++--- udp_flow.c | 8 +++- udp_flow.h | 2 +- udp_vu.c | 4 +- vhost_user.c | 38 +++++++++------- virtio.h | 2 +- vu_common.c | 13 +++--- vu_common.h | 3 +- 31 files changed, 416 insertions(+), 208 deletions(-) -- 2.51.0