Re: [PATCH 00/10] Fixes for DP8393X SONIC device emulation

[Aleksandar Markovic]

On Sunday, December 15, 2019, Finn Thain <address@hidden> wrote:
> On Sat, 14 Dec 2019, Aleksandar Markovic wrote:
>
> > On Saturday, December 14, 2019, Finn Thain <address@hidden>
> > wrote:
> > 
> > > Hi All,
> > >
> > > There is a bug in the DP8393X emulation that can stop packet reception.
> > >
> > >
> > Can you provide the details of your test scenario?
> > 
> > Thanks,
> > Aleksandar
> > 
>
> I test the qemu build like this,
>
> qemu-system-m68k -M q800 -m 512M -serial none -serial mon:stdio -g 800x600x4
> -net nic,model=dp83932,addr=00:00:00:01:02:03
> -net bridge,helper=/opt/qemu/libexec/qemu-bridge-helper,br=br0
> -append "fbcon=font:ProFont6x11 console=tty0 console=ttyS0 ignore_loglevel"
> -kernel vmlinux-4.14.157-mac-backport+
> -initrd /mnt/loop/install/cdrom/initrd.gz
>
> You can obtain this kernel binary from the linux-mac68k project on 
> sourceforge. (I usually use a mainline Linux build but it makes no 
> difference.)
>
> I normally use a disk image with Debian/m68k SID rootfs but in this 
> example I've used the initrd that you can find on the Debian/m68k 
> installer ISO.
>
> Once the guest starts, switch to a different virtual console and bring up 
> the SONIC:
>
> <ctrl>-<a> <ctrl>-<a> <2>
> # ip addr add dev eth0 192.168.65.2/24
> # ip link set dev eth0 up
>
> On the host, send a ping flood (with preload) to the guest:
>
> # ifconfig br0 192.168.65.1/24
> # ping 192.168.65.2 -f -l 20
>
> The packet reception ("deaf sonic") issue is reproduced immediately.
>
> This has been observed in both qemu-m68k and mainline qemu. See also,
> https://github.com/vivier/qemu-m68k/commit/0a45280c9fa40da8d5f30b1bb3d0513db91c3909

Finn,

I appreciate your detailed response!

Aleksandar