[Qemu-devel] Can you commit the pcnet patch ?

[Qemu-devel] Can you commit the pcnet patch ?

[Ludovic Drolez]

Hi !

I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu 0.7 
because I was tired of the sloooww PXE booting of my QEMU. For exemple, to load 
a linux kernel + initrd over TFTP, it takes 4m30s with a ne2000, and 1m35s with 
the PCNET card.

I had no problems with this driver under Windows and Linux, so it would be nice 
to have this driver for the next Qemu release...

Cheers,

-- 
Ludovic DROLEZ                              Linbox / Free&ALter Soft
www.linbox.com www.linbox.org	              tel: +33 3 87 50 87 90
152 rue de Grigy - Technopole Metz 2000                   57070 METZ

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Paul Brook]

On Wednesday 20 July 2005 11:32, Ludovic Drolez wrote:
> Hi !
>
> I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu
> 0.7 because I was tired of the sloooww PXE booting of my QEMU. For exemple,
> to load a linux kernel + initrd over TFTP, it takes 4m30s with a ne2000,
> and 1m35s with the PCNET card.

A reference URL would be handy. I assume you mean:

http://dad-answers.com/qemu/patches/AMD-PCNET-II/qemu-pcnet.patch6.gz

Paul

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

or maybe this one, containing more of Anthony's patches:

http://cyberkinetica.homeunix.net/qemu/

:)

Christian

On 7/20/05, Paul Brook wrote:
> A reference URL would be handy. I assume you mean:
> 
> http://dad-answers.com/qemu/patches/AMD-PCNET-II/qemu-pcnet.patch6.gz
>

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Ludovic Drolez]

Paul Brook wrote:
> A reference URL would be handy. I assume you mean:
> 
> http://dad-answers.com/qemu/patches/AMD-PCNET-II/qemu-pcnet.patch6.gz
> 

Yes, this one !

-- 
Ludovic DROLEZ

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

anyway, this patch as it is fails on v0.7.0
needs re-alignment badly...
if you've an updated patch, could you post it, please ?

Thx
Christian

On 7/20/05, Ludovic Drolez <ldrolez@linbox.com> wrote:
> Paul Brook wrote:
> > A reference URL would be handy. I assume you mean:
> >
> > http://dad-answers.com/qemu/patches/AMD-PCNET-II/qemu-pcnet.patch6.gz
> >
> 
> Yes, this one !
> 
> --
> Ludovic DROLEZ
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
> 


-- 
Christian

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

> > Yes, this one !

I think I understand now why it's not in the mainline yet.
This is only for linux hosts. I doesn't compile (yet :) ) 
on Windows hosts.

I already tapped into the patch to see if I can make it
work on Windows.

Christian

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

When I try to replace bcmp (inexistant in mingw32) with memcmp
inside pcnet.h, like this:

int result = (!CSR_DRCVPA(s)) && !bcmp(hdr->ether_dhost, padr, 6);

into 

int result = (!CSR_DRCVPA(s)) && !bcmp(hdr->ether_dhost, padr, 6);

I get the following error:
In file included from C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.c:64:
C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.h: In function `padr_match':
C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.h:531: error:
dereferencing pointer to incomplete type

anyone having a fix. I'm quite puzzled by the gcc error message.

Thx
Christian

=============================================
static inline int padr_match(PCNetState *s, const uint8_t *buf, int size)
{
    struct ether_header *hdr = (void *)buf;
    uint8_t padr[6] = { 
        s->csr[12] & 0xff, s->csr[12] >> 8,
        s->csr[13] & 0xff, s->csr[13] >> 8,
        s->csr[14] & 0xff, s->csr[14] >> 8 
    };
int result = (!CSR_DRCVPA(s)) && !memcmp(hdr->ether_dhost, padr, 6);

for better understanding of the faulty piece of code

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Paul Brook]

> I get the following error:
> In file included from C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.c:64:
> C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.h: In function `padr_match':
> C:/dev/msys/1.0/home/xian/qemu-0.7.0/hw/pcnet.h:531: error:
> dereferencing pointer to incomplete type
>...
>     struct ether_header *hdr = (void *)buf;
>     uint8_t padr[6] = {
>         s->csr[12] & 0xff, s->csr[12] >> 8,
>         s->csr[13] & 0xff, s->csr[13] >> 8,
>         s->csr[14] & 0xff, s->csr[14] >> 8
>     };
> int result = (!CSR_DRCVPA(s)) && !memcmp(hdr->ether_dhost, padr, 6);

Probably win32 doesn't have a definition for "struct ether_header".

Paul

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Filip Navara]

Christian MICHON wrote:

>>>Yes, this one !
>>>      
>>>
>
>I think I understand now why it's not in the mainline yet.
>This is only for linux hosts. I doesn't compile (yet :) ) 
>on Windows hosts.
>
>I already tapped into the patch to see if I can make it
>work on Windows.
>
>Christian
>
Hmm, I used it on Windows some time ago...

- Filip

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Lars Munch]

On Wed, Jul 20, 2005 at 12:32:10PM +0200, Ludovic Drolez wrote:
> Hi !
> 
> I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu 
> 0.7 because I was tired of the sloooww PXE booting of my QEMU. For exemple, 
> to load a linux kernel + initrd over TFTP, it takes 4m30s with a ne2000, 
> and 1m35s with the PCNET card.

Does anyone know why pcnet is so much faster than ne2000? is it easier
to emulate? or is there room for improvements on the ne2000?  

-- Lars Munch

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

[-- Attachment #1: Type: text/plain, Size: 521 bytes --]

Hi Filip,

On 7/20/05, Filip Navara wrote:
> Hmm, I used it on Windows some time ago...

did it work ? I manage to update and compile the patch for qemu 0.7.0
and windows host (see attached file). I added some #ifdef and followed
Paul's hint of yesterday (thx Paul :) ).

It compiles fine, but all my clients crash whenever the tcp/ip layer gets
loaded. I tried on linux slaxpro.iso, win95b and win2003/sp1 eval.

Any uber-hacker on windows who could get this to work, pls ?
Thanks in advance.

Christian

[-- Attachment #2: qemu-pcnet.patch7.gz --]
[-- Type: application/x-gzip, Size: 14677 bytes --]

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Paul Brook]

On Thursday 21 July 2005 08:29, Lars Munch wrote:
> On Wed, Jul 20, 2005 at 12:32:10PM +0200, Ludovic Drolez wrote:
> > Hi !
> >
> > I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu
> > 0.7 because I was tired of the sloooww PXE booting of my QEMU. For
> > exemple, to load a linux kernel + initrd over TFTP, it takes 4m30s with a
> > ne2000, and 1m35s with the PCNET card.
>
> Does anyone know why pcnet is so much faster than ne2000? is it easier
> to emulate? or is there room for improvements on the ne2000?

Probably because it's a DMA capable controller. IIRC the ne2k is pio based, so 
has to shuffle the data through an IO port one byte at a time.

Paul

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

I tried using pxe (at least the probe) to get more diagnostics
regarding this pcnet failure.

Based on the windows host patches I posted earlier on, I get
this message:

=============================================
Probing pci nic...
[lancepci]pcnet32.c: Found lancepci, Vendor=0x1022 Device=0x2000
lancepci: 52:54:00:12:34:56 at ioaddr C020, No MII tranceiver found!
=============================================

This apparently tells the hw emulation is incomplete. When using
realtek, I do not get this tranceiver message.

If I try to boot win95 guest with "-nic-pcnet -nics 2", I finally get an IP
thru the DHCP, but the network does not work.

The patch needs badly some update/improvement on the windows side.
Any specialist around? I'm puzzled, not being an expert in this field.

Christian

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Ludovic Drolez]

Christian MICHON wrote:
> =============================================
> Probing pci nic...
> [lancepci]pcnet32.c: Found lancepci, Vendor=0x1022 Device=0x2000
> lancepci: 52:54:00:12:34:56 at ioaddr C020, No MII tranceiver found!
> =============================================

Very strange... I had no problems with Etherboot's PXE and a linux host.

Why a virtual network driver works under linux and not under windows ?

-- 
Ludovic DROLEZ

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Filip Navara]

Christian MICHON wrote:

>Hi Filip,
>
>On 7/20/05, Filip Navara wrote:
>  
>
>>Hmm, I used it on Windows some time ago...
>>    
>>
>
>did it work ? I manage to update and compile the patch for qemu 0.7.0
>and windows host (see attached file). I added some #ifdef and followed
>Paul's hint of yesterday (thx Paul :) ).
>
>It compiles fine, but all my clients crash whenever the tcp/ip layer gets
>loaded. I tried on linux slaxpro.iso, win95b and win2003/sp1 eval.
>
>Any uber-hacker on windows who could get this to work, pls ?
>Thanks in advance.
>  
>
I used it with ReactOS and WinXP. I remember that except the compilation 
fixes I also had to fix the PCI subsystem id ... Anyway, the patch that 
I made at that time should be available somewhere in the qemu-devel 
archives. I'll try to find it when I get at my home computer.

- Filip

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Antony T Curtis]

On Thu, 2005-07-21 at 15:49 +0200, Christian MICHON wrote:
> I tried using pxe (at least the probe) to get more diagnostics
> regarding this pcnet failure.
> 
> Based on the windows host patches I posted earlier on, I get
> this message:
> 
> =============================================
> Probing pci nic...
> [lancepci]pcnet32.c: Found lancepci, Vendor=0x1022 Device=0x2000
> lancepci: 52:54:00:12:34:56 at ioaddr C020, No MII tranceiver found!
> =============================================
> 
> This apparently tells the hw emulation is incomplete. When using
> realtek, I do not get this tranceiver message.
> 
> If I try to boot win95 guest with "-nic-pcnet -nics 2", I finally get an IP
> thru the DHCP, but the network does not work.
> 
> The patch needs badly some update/improvement on the windows side.
> Any specialist around? I'm puzzled, not being an expert in this field.

Early AMD PCNet controllers did not need/use a seperate MII chip. The
PCNet device as emulated is one of these earlier devices. (I can provide
pdf copy datasheet, and I have one such adaptor here in hardware)


-- 
Antony T Curtis, BSc.                   UNIX, Linux, *BSD, Networking
antony.t.curtis@ntlworld.com            C++, J2EE, Perl, MySQL, Apache
                                        IT Consultancy.

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Filip Navara]

Filip Navara wrote:

> Christian MICHON wrote:
>
>> Hi Filip,
>>
>> On 7/20/05, Filip Navara wrote:
>>  
>>
>>> Hmm, I used it on Windows some time ago...
>>>   
>>
>>
>> did it work ? I manage to update and compile the patch for qemu 0.7.0
>> and windows host (see attached file). I added some #ifdef and followed
>> Paul's hint of yesterday (thx Paul :) ).
>>
>> It compiles fine, but all my clients crash whenever the tcp/ip layer 
>> gets
>> loaded. I tried on linux slaxpro.iso, win95b and win2003/sp1 eval.
>>
>> Any uber-hacker on windows who could get this to work, pls ?
>> Thanks in advance.
>>  
>>
> I used it with ReactOS and WinXP. I remember that except the 
> compilation fixes I also had to fix the PCI subsystem id ... Anyway, 
> the patch that I made at that time should be available somewhere in 
> the qemu-devel archives. I'll try to find it when I get at my home 
> computer.

Ok, I lost the compilation patch ... but the other one is here: 
www.volny.cz/xnavara/pcnet.c.diff

- Filip

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Christian MICHON]

On 7/21/05, Filip Navara wrote:
> Ok, I lost the compilation patch ... but the other one is here:
> www.volny.cz/xnavara/pcnet.c.diff
> 

the qemu instance still crashes. I'm using plain
http://ftp.sh.cvut.cz/MIRRORS/slax/SLAX-5.0.x/special-editions/slax-frodo-5.0.6.iso
for testing.

As soon as hotplug and RPC starts, the qemu dies. First time I
see such a crash in a *long* time, but I guess it's my fault too :)

-- 
Christian

Re: [Qemu-devel] Can you commit the pcnet patch ?

[Fabrice Bellard]

Paul Brook wrote:
> On Thursday 21 July 2005 08:29, Lars Munch wrote:
> 
>>On Wed, Jul 20, 2005 at 12:32:10PM +0200, Ludovic Drolez wrote:
>>
>>>Hi !
>>>
>>>I've tried the latest AMD pcnet patch (made by Antony T Curtis) with qemu
>>>0.7 because I was tired of the sloooww PXE booting of my QEMU. For
>>>exemple, to load a linux kernel + initrd over TFTP, it takes 4m30s with a
>>>ne2000, and 1m35s with the PCNET card.
>>
>>Does anyone know why pcnet is so much faster than ne2000? is it easier
>>to emulate? or is there room for improvements on the ne2000?
> 
> 
> Probably because it's a DMA capable controller. IIRC the ne2k is pio based, so 
> has to shuffle the data through an IO port one byte at a time.

I don't think that the switch to DMA can explain a factor of 3. Another 
possibility is that there is a bug in the ne2000 code. It could be 
interesting to check the send and receive latencies by adding traces in 
the ne2000 code...

Fabrice.