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

["Tian, Feng" <feng.tian@intel.com>]

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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