The design purpose of NET_BUF is to meet the buffer management requirement for
different network modules. For example, IP module supports reassemble and
fragment packets; NET_BUF provides the capability to wrap a list of buffers
into one buffer to avoid data copy in different layers.
Best Regards,
Ye Ting
From: Thomas Rognon [mailto:tcrog...@gmail.com]
Sent: Monday, May 12, 2014 10:48 PM
To: edk2-devel
Subject: Re: [edk2] How do I use NET_BUF?
Yes I see NetbufAlloc(), NetbufAllocSpace(), NetbufBuildExt(), etc. I guess I'm
looking for more of a conceptual overview of the NET_BUF struct, particularly
in relation to the two scenarios I mentioned. The documentation in the code
describes the details, but doesn't really give an overview or describe how to
use it.
I've been reading a lot of the code that uses it, such as the iScsi driver, and
am having difficulty grasping its general purpose and usage. For something
simple like sending a buffer to a socket or receiving data from a socket into a
buffer, it seems to wrap it in a lot of complexity. I'm sure there's an
advantage, but I'm just not getting it.
On May 12, 2014 12:47 AM, "Ye, Ting"
<ting...@intel.com<mailto:ting...@intel.com>> wrote:
You may use NetbufAlloc() in your cases. Please check DxeNetLib in MdeModulePkg
for more NET_BUF operation APIs.
Best Regards,
Ye Ting
From: Thomas Rognon [mailto:tcrog...@gmail.com<mailto:tcrog...@gmail.com>]
Sent: Monday, May 12, 2014 8:27 AM
To: edk2-devel
Subject: [edk2] How do I use NET_BUF?
Experts,
I'd like to use the TcpIoLib and UdpIoLib, but I spend way too much time
dealing with the NET_BUF struct. I must be doing things the hard way.
What is the best way to set up a NET_BUF for the following two scenarios? Is it
different for asynchronous vs. synchronous? Are there any other considerations?
Scenario 1)
I have UINTN DataSize and UINT8 *Data and would like to send Data using
TcpIoTransmit() or UdpIoSendDatagram().
Scenario 2)
I have UINT8 Stream[STREAM_SIZE] and would like to receive things into Stream
using TcpIoReceive() or UdpIoRecvDatagram().
I've resorted to just having my TcpIoLib/UdpIoLib that takes Data directly and
dumps into Stream directly, thereby avoiding NET_BUF. This works just fine, but
I would rather use what's already out there. NET_BUF is giving me a headache,
though.
Thank you for any help!
Thomas
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