Re: [Qemu-devel] [PATCH V2 0/2] net: Fix lan9118 multi-buffer transmit

[Stefan Hajnoczi <stefanha@gmail.com>]

On Tue, Jan 07, 2014 at 08:19:50PM -0800, Roy Franz wrote:
> This patchset fixes some bugs in the lan9118 emulation that were found
> while debugging UEFI network support on the emulated VExpress platform.
> 
> The 9118 ethernet controller supports transmission of multi-buffer packets 
> with arbitrary byte alignment of the start and end bytes of each buffer.  
> All writes to the packet fifo are 32 bits, so the controller discards 
> bytes at the beginning and end of each buffer based on the 'Data start 
> offset' and 'Buffer size' of the TX command 'A' word.  
> 
> The UEFI network driver uses 1 buffer for the packet header, and one for 
> the payload.  The mishandling of the start offset and buffer length 
> resulted in extra bytes being inserted in the packet.  
> 
> With these changes the UEFI network driver that works with the real 9118 
> chip on the VExpress evaluation board works unmodified on QEMU.  The Linux 
> kernel driver continues to work on QEMU as well.  Since the Linux driver 
> was unaffected by these bugs I am inferring that it is using a single 
> buffer for each packet.  
> 
> Changes since V1:
> * use extract32() instead of shift/mask for CMD A field extraction
> * compute number of valid bytes in word at beginning of block
> 
> Roy Franz (2):
>   Fix lan9118 TX "CMD A" handling
>   Fix lan9118 buffer length handling
> 
>  hw/net/lan9118.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Thanks, applied to my net tree:
https://github.com/stefanha/qemu/commits/net

Stefan