Re: Using USB-Ethernet adapter in UEFI on an arm64 platform

[Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>]

Hi Feng,

Thank you for your explanation.
I have Cisco 300M AX88772A-based adapter, so AX88772 (with no "b") driver
was picked up.
I had to modify it with circular buffer to get ping and tftp going. Also I
had to receive packets in GetStatus rather than in SN_Receive (otherwise I
could never get into the Shell).
This way I have ping with response time of approx. 200ms, and tftp
working, albeit it is slow.
So do you suggest me to use Ax88772b driver for AX88772A/AX88772
usb-ethernet adapter?
Also maybe you know if there are UEFI drivers for other USB-ethernet
adapters (maybe 1G?) available somewhere?

Thank you,
Vladimir
-----Original Message-----
From: Tian, Feng [mailto:feng.tian@intel.com]
Sent: April-09-17 9:49 PM
To: Vladimir Olovyannikov; edk2-devel@lists.01.org
Cc: Tian, Feng
Subject: RE: [edk2] Using USB-Ethernet adapter in UEFI on an arm64
platform

Hi, Vladimir,

Which usb2lan driver you are using for AX88772 adpater? The one in
OptionRomPkg\Bus\Usb\UsbNetworking has bug on the polling performance. The
one in OptionRomPkg\Bus\Usb\UsbNetworking\Ax88772b is better but if there
is no data received, the polling operation still wastes some time.

The root cause about the low performance of polling is because USB spec
doesn't clearly define which value should be returned if user requests
Bulk Read operation but there is no data. Some data-streaming usb devices,
such as Realtek usb2lan, return success with data length setting to 0, but
others, such as AX88772, just keep active and wait for data always. From
BIOS view, we have to return EFI_TIMEOUT for latter case to avoid system
hang. That's why you see the low performance for polling operation in
no-data case.

Thanks
Feng

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
Vladimir Olovyannikov
Sent: Saturday, April 8, 2017 3:06 AM
To: edk2-devel@lists.01.org
Subject: [edk2] Using USB-Ethernet adapter in UEFI on an arm64 platform

Hi,

I would like to enable Ethernet using USB-Ethernet AX88772 adapter in the
UEFI on an armv8 arm64 platform.
Ethernet polling is done by MnpPoll() periodically. This creates a burden
on the system so that UEFI boots in 1 minute to the Shell due to receive
polling.
The USB operation is very resource expensive which causes UEFI to choke
up.
There is DisableBackgroundPolling option in the
EFI_MANAGED_NETWORK_CONFIG_DATA structure, but it is turned off by all
other drivers (DNSDxe, Ip4Dxe, ArpDxe...).
Can anybody advise what I could do?
Mass storage/keyboard/etc. all work fine...

Thank you,
Vladimir
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