Re: [lwip-devel] [task #7896] Support zero-copy drivers

[address@hidden]

Wow, your alive, hehe. Nice hearing from you!


Jonathan Larmour wrote:
> > I think it would still be more efficient if
> > you don't have chained DMA if you had to do this in 2 separate
> > transfers to the MAC.
> >      
> Not all MACs would be able to do that.
>    
For example the last FPGA-based MAC I used only allowed single-buffer 
ethernet frames that are aligned on a 32-bit boundary.

So reading the rest of the mail, is this (task #7896) all about 
alignment only? Because if so, I wouldn't want to let that hold back 
1.4.0 if it's only new code, not changing the API.

The only thing I can add is that for my other MAC, the only limitation 
is alignment, too. There might be other things though (like having all 
pbufs of a specific maximum length for RX), but I guess these could be 
also solved by allocating pbufs correctly.

Simon