Re: [Qemu-devel] [PATCH v3] VMXNET3 paravirtual NIC device implementation

[Gerhard Wiesinger <lists@wiesinger.com>]

Hello Dmitry,

Issue is solved in V3 but I'm still having problems (core dumps) with qemu 
and qemu-kvm:

1.) qemu crashes
works well with basic ping tests but with generating load on the network 
interface (my standard netio tests (netio -s, netio -t server), 
http://www.ars.de/ars/ars.nsf/docs/netio)
under same Knoppix testcase cores. Details are below.

Also performance as far as the test runs was not high (should be 
>50000 kByte/s):
Packet size  1k bytes:  4181 KByte/s Tx,  5276 KByte/s Rx.
Details below.

2.) qemu-kvm core dump on startup, core dump details below
-device vmxnet3,mac=1a:46:0b:ca:bc:7e,vlan=1,romfile=
-net tap,ifname=tap1,script=no,downscript=no,vlan=1
kvm_msix_vector_add: kvm_add_msix failed: No space left on device
[vmxnet3][WR][vmxnet3_use_msix_vectors]: Failed to use MSI-X vector 9, error -28
[vmxnet3][WR][vmxnet3_init_msix]: Failed to use MSI-X vectors, error 0
qemu: hardware error: Failed to initialize MSI-X, configuration is inconsistent.

Any ideas?
Can you please retest this scenario.

Please add Reported-by lines ...

Thnx.

Ciao,
Gerhard

--
http://www.wiesinger.com/

1.) qemu backtrace
[vmxnet3][WR][vmxnet3_peer_has_vnet_hdr]: Peer has no virtio extension. 
Task offloads will be emulated.
qemu-system-x86_64: /root/download/qemu/git/qemu/hw/vmxnet_utils.c:186: 
eth_setup_ip4_fragmentation: Assertion `0 == frag_offset % (8)' failed.
#0  0x00007f5f53c03285 in raise () from /lib64/libc.so.6
#1  0x00007f5f53c04b9b in abort () from /lib64/libc.so.6
#2  0x00007f5f53bfbe9e in __assert_fail_base () from /lib64/libc.so.6
#3  0x00007f5f53bfbf42 in __assert_fail () from /lib64/libc.so.6
#4  0x00007f5f564ce378 in eth_setup_ip4_fragmentation (l2hdr=<optimized out>, l2hdr_len=<optimized out>, l3hdr=<optimized out>,    l3hdr_len=<optimized out>, l3payload_len=<optimized out>, frag_offset=<optimized out>, more_frags=false)    at /root/download/qemu/git/qemu/hw/vmxnet_utils.c:186
#5  0x00007f5f564cd325 in vmxnet3_txpkt_do_sw_fragmentation (s=0x7f5f57c340a0, p=0x7f5f57c35340)    at /root/download/qemu/git/qemu/hw/vmxnet3.c:955
#6  0x00007f5f564cdac1 in vmxnet3_send_with_sw_offloads (pkt=<optimized out>, s=0x7f5f57c340a0) at /root/download/qemu/git/qemu/hw/vmxnet3.c:985
#7  vmxnet3_send_packet (qidx=0, pkt=<optimized out>, s=<optimized out>) at /root/download/qemu/git/qemu/hw/vmxnet3.c:1231
#8  vmxnet3_process_tx_queue (qidx=<optimized out>, s=<optimized out>) at /root/download/qemu/git/qemu/hw/vmxnet3.c:1306
#9  vmxnet3_io_bar0_write (opaque=<optimized out>, addr=<optimized out>, val=<optimized out>, size=<optimized out>)    at /root/download/qemu/git/qemu/hw/vmxnet3.c:1630
#10 0x00007f5f56575ba0 in access_with_adjusted_size (addr=1536, value=0x7f5f3144e7e0, size=4, access_size_min=<optimized out>,    access_size_max=<optimized out>, access=0x7f5f56575ac0 <memory_region_write_accessor>, opaque=0x7f5f57c344d0)    at /root/download/qemu/git/qemu/memory.c:359
#11 0x00007f5f5657a6ec in memory_region_dispatch_write (size=4, data=39, addr=1536, mr=0x7f5f57c344d0)    at /root/download/qemu/git/qemu/memory.c:928
#12 io_mem_write (io_index=<optimized out>, addr=1536, val=<optimized out>, size=4) at /root/download/qemu/git/qemu/memory.c:1512
#13 0x0000000049463183 in ?? ()
#14 0x0000000000000000 in ?? ()


2.) qemu-kvm backtrace
#0  0x00007f25e4330285 in raise () from /lib64/libc.so.6
#1  0x00007f25e4331b9b in abort () from /lib64/libc.so.6
#2  0x00007f25e6c6fe7a in hw_error (fmt=<optimized out>) at /root/download/qemu/git/qemu-kvm/cpus.c:357
#3  0x00007f25e6bf1f01 in vmxnet3_pci_init (dev=0x7f25e8dced80) at /root/download/qemu/git/qemu-kvm/hw/vmxnet3.c:2631
#4  0x00007f25e6ce01c6 in pci_qdev_init (qdev=0x7f25e8dced80) at /root/download/qemu/git/qemu-kvm/hw/pci.c:1589
#5  0x00007f25e6c14d4a in qdev_init (dev=0x7f25e8dced80) at /root/download/qemu/git/qemu-kvm/hw/qdev.c:150
#6  0x00007f25e6c1024e in qdev_device_add (opts=0x7f25e8ccdb80) at /root/download/qemu/git/qemu-kvm/hw/qdev-monitor.c:465
#7  0x00007f25e6bebff9 in device_init_func (opts=<optimized out>, opaque=<optimized out>) at /root/download/qemu/git/qemu-kvm/vl.c:1827
#8  0x00007f25e6c1e492 in qemu_opts_foreach (list=<optimized out>, func=0x7f25e6bebfe0 <device_init_func>, opaque=0x0,    abort_on_failure=<optimized out>) at qemu-option.c:1053
#9  0x00007f25e6b184b5 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /root/download/qemu/git/qemu-kvm/vl.c:3543

On Wed, 7 Mar 2012, Dmitry Fleytman wrote:

> Changes in V3:
>   Fixed crash when net device that is used as network fronted has no
>   virtio HDR support.
>   Task offloads emulation for cases when net device that is used as
>   network fronted has no virtio HDR support.
> Changes in V2:
>   License text changed accoring to community suggestions
>   Standard license header from GPLv2+ - licensed QEMU files used
>
> Dmitry Fleytman (1):
>  VMXNET3 paravirtual NIC device implementation
>
> Makefile.objs           |    1 +
> default-configs/pci.mak |    1 +
> hw/pci.c                |    2 +
> hw/pci.h                |    1 +
> hw/virtio-net.h         |   13 +-
> hw/vmware_utils.h       |  131 +++
> hw/vmxnet3.c            | 2744 +++++++++++++++++++++++++++++++++++++++++++++++
> hw/vmxnet3.h            |  727 +++++++++++++
> hw/vmxnet3_debug.h      |  104 ++
> hw/vmxnet_utils.c       |  202 ++++
> hw/vmxnet_utils.h       |  263 +++++
> iov.c                   |   27 +
> iov.h                   |    3 +
> net.c                   |    2 +-
> net/checksum.h          |    7 +
> 15 files changed, 4221 insertions(+), 7 deletions(-)
> create mode 100644 hw/vmware_utils.h
> create mode 100644 hw/vmxnet3.c
> create mode 100644 hw/vmxnet3.h
> create mode 100644 hw/vmxnet3_debug.h
> create mode 100644 hw/vmxnet_utils.c
> create mode 100644 hw/vmxnet_utils.h
>
> -- 
> 1.7.7.6
>
>
>