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vhost-user multi-queues interrupt failed when Qemu reconnection happens
After upgrade qemu to v4.2.0, vhost-user multi-queues interrupt failed with event idx interrupt mode when reconnection happens.
Test Environment:
DPDK version: DPDK v19.11
Other software versions: qemu 4.2.0.
OS: Linux 4.15.0-20-generic
Compiler: gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
Hardware platform: Purley.
The reproduce step is:
1. Launch l3fwd-power example app with client mode::
./l3fwd-power -l 1-16 \
-n 4 --socket-mem 1024,1024 --legacy-mem --no-pci\
--log-level=9 \
--vdev 'eth_vhost0,iface=/vhost-net0,queues=16,client=1' \
-- -p 0x1 \
--parse-ptype 1 \
--config "(0,0,1),(0,1,2),(0,2,3),(0,3,4),(0,4,5),(0,5,6),(0,6,7),(0,7,8),(0,8,9),(0,9,10),(0,10,11),(0,11,12),(0,12,13),(0,13,14),(0,14,15),(0,15,16)"
2. Launch VM1 with server mode:
3. Relauch l3fwd-power sample to for reconnection:
./l3fwd-power -l 1-16 \
-n 4 --socket-mem 1024,1024 --legacy-mem --no-pci\
--log-level=9 \
--vdev 'eth_vhost0,iface=/vhost-net0,queues=16,client=1' \
-- -p 0x1 \
--parse-ptype 1 \
--config "(0,0,1),(0,1,2),(0,2,3),(0,3,4),(0,4,5),(0,5,6),(0,6,7),(0,7,8),(0,8,9),(0,9,10),(0,10,11),(0,11,12),(0,12,13),(0,13,14),(0,14,15),(0,15,16)"
4. Set vitio-net with 16 quques and give vitio-net ip address:
ethtool -L [ens3] combined 16 # [ens3] is the name of virtio-net
ifconfig [ens3] 1.1.1.1
5. Send packets with different IPs from virtio-net, notice to bind each vcpu to different send packets process::
taskset -c 0 ping 1.1.1.2
taskset -c 1 ping 1.1.1.3
taskset -c 2 ping 1.1.1.4
taskset -c 3 ping 1.1.1.5
taskset -c 4 ping 1.1.1.6
taskset -c 5 ping 1.1.1.7
taskset -c 6 ping 1.1.1.8
taskset -c 7 ping 1.1.1.9
taskset -c 8 ping 1.1.1.2
taskset -c 9 ping 1.1.1.2
taskset -c 10 ping 1.1.1.2
taskset -c 11 ping 1.1.1.2
taskset -c 12 ping 1.1.1.2
taskset -c 13 ping 1.1.1.2
taskset -c 14 ping 1.1.1.2
taskset -c 15 ping 1.1.1.2
If everything ok, then we can see the result such as following:
L3FWD_POWER: lcore 0 is waked up from rx interrupt on port 0 queue 0
...
...
L3FWD_POWER: lcore 15 is waked up from rx interrupt on port 0 queue 15
But we can't see the log above because of the bug.
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