e1000 kick

e1000 kick

[Scott Huang]

Hi folks,

Is there a way to force tx dma to start on e1000 after
the I fill up the tx ring to a certain level?

thanks

-Scott

Re: e1000 kick

[Scott Feldman]

On Fri, 2004-10-08 at 16:17, Scott Huang wrote:
> Is there a way to force tx dma to start on e1000 after
> the I fill up the tx ring to a certain level?

Just delay the write of the Tx tail index (TDT).  Writing to the Tx tail
index signals hardware to start the DMA from Tx head index (TDH) to
TDT.  See code for

	E1000_WRITE_REG(&adapter->hw, TDT, i);

But don't delay too long...you'll trigger the tx_timeout reset.

-scott

Re: e1000 kick

[jamal]

What are you trying to do?
I have some patches i wouldnt mind passing on for test purposes
but it would depend on what the end goal is,

cheers,
jamal

On Fri, 2004-10-08 at 19:17, Scott Huang wrote:
> Hi folks,
> 
> Is there a way to force tx dma to start on e1000 after
> the I fill up the tx ring to a certain level?
> 
> thanks
> 
> -Scott
> 
> 
> 

Re: e1000 kick

[Scott Huang]

Hi Jamal,

I would like to DMA packets to/from pre-allocated
fixed-sized buffer pools for a user space TCP/IP stack
to transmit/receive packets. The Rx path is working
well. I wanted to control when the card should DMA
packets from the Tx pool. 

thanks 

-Scott


--- jamal <hadi@cyberus.ca> wrote:

> What are you trying to do?
> I have some patches i wouldnt mind passing on for
> test purposes
> but it would depend on what the end goal is,
> 
> cheers,
> jamal
> 
> On Fri, 2004-10-08 at 19:17, Scott Huang wrote:
> > Hi folks,
> > 
> > Is there a way to force tx dma to start on e1000
> after
> > the I fill up the tx ring to a certain level?
> > 
> > thanks
> > 
> > -Scott
> > 
> > 
> > 
> 
> 

Re: e1000 kick

[jamal]

Scott,
Sorry to bother you again. I am still trying to evaluate whether i
should go and grab these patches from the unconnected machine.
In other words, they may not be useful for you.
Is this a proprieatry stack, something you are researching. what?
How do you pass the packets from user space straight to DMA?

cheers,
jamal

On Mon, 2004-10-11 at 12:24, Scott Huang wrote:
> Hi Jamal,
> 
> I would like to DMA packets to/from pre-allocated
> fixed-sized buffer pools for a user space TCP/IP stack
> to transmit/receive packets. The Rx path is working
> well. I wanted to control when the card should DMA
> packets from the Tx pool. 
> 
> thanks 
> 
> -Scott
> 
> 
> --- jamal <hadi@cyberus.ca> wrote:
> 
> > What are you trying to do?
> > I have some patches i wouldnt mind passing on for
> > test purposes
> > but it would depend on what the end goal is,
> > 
> > cheers,
> > jamal
> > 
> > On Fri, 2004-10-08 at 19:17, Scott Huang wrote:
> > > Hi folks,
> > > 
> > > Is there a way to force tx dma to start on e1000
> > after
> > > the I fill up the tx ring to a certain level?
> > > 
> > > thanks
> > > 
> > > -Scott
> > > 
> > > 
> > > 
> > 
> > 
> 
> 
>