netdev - Re: Hight speed data sending from custom IP out of kernel

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Date:	Tue, 19 Apr 2011 14:34:03 +0300
From:	"juice" <juice@...gman.org>
To:	monstr@...str.eu, netdev@...r.kernel.org
Subject: Re: Hight speed data sending from custom IP out of kernel

Hi Michal.

How fast do you need to send the data?
I have an application where I send test stream out to GE line and can fill
the total capacity of the ethernet regardless of the packet size.

The test stream I am sending is stored in kernel memory, and therefore is
limited by the amount of free memory. 200M is no problem.

The solution I am using is loosely based on the pktgen module, except that
my module can load a wireshark capture from userland program and then send
it from ethernet interface in wire speed.

  - Juice -


> Hi,
> I would like to create demo for high speed data sending from custom IP
through
> the ethernet. I think the best description is that there are dmaable memory
> mapped registers or just memory which store data I want to send (for
example 200MB).
> Linux should handle all communication between target(probably server)
and
> host
> (client) but data in the packets should go from that custom IP and can't go
> through the kernel because of performance issue.
> Ethernet core have own DMA which I could use but the question is if
there
> is any
> option how to convince the kernel that data will go directly from memory
mapped
> registers and the kernel/driver/... just setup dma BD for headers and
second for
> data.
> Do you have any experience with any solution with passing data
completely
> out of
> kernel?
> Thanks,
> Michal
> --
> Michal Simek, Ing. (M.Eng)
> w: www.monstr.eu p: +42-0-721842854
> Maintainer of Linux kernel 2.6 Microblaze Linux -
> http://www.monstr.eu/fdt/
> Microblaze U-BOOT custodian
> --
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