Re: Q: (ab)using zerocopy for drivers with alignment contraints

[Jeff Garzik <jgarzik@xxxxxxxxxxxxxxxx>]

Manfred Spraul wrote:
> 
> Several cheap busmaster nics only accept tx buffers that are 32-bit
> aligned.
> 
> Currently they memcpy into transfer buffers. What about replacing that
> memcpy with csum_copy_partial_nocheck and enabling NETIF_F_{SG,HW_CSUM}?
> 
> I've attached a beta patch against the 8139too driver.
> 
> szc_copy_csum() isn't driver specific, perhaps move it to
> linux/net/core/skbuff.c?

I'm definitely for reducing copies, so this patch looks nice.

I would prefer to call it "single-copy" or something other than
zero-copy, though...

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