Hi.
On Wed, Jul 18, 2007 at 11:51:03PM -0700, vinay ravuri ([EMAIL PROTECTED])
wrote:
> How about the following approach:
>
> I allocate an skb of 0 bytes and replace data element
> of skb struct (i.e. skb.data = addr_given_by_hw) when
> the h/w interrupts me with a packet. I register for a
> destructor for this skb and when the kernel is ready
> to free the skb, I make sure that my free is invoked -
> Ofcourse this is assuming that their is a facility in
> linux socket buffers to be able to do destructors. Is
> this approach a viable, if so, are any gottcha's?
It will not work, since kfree_skb() eventually tries to free skb->head
into kmem cache, so you will need to hack kfree_skb() not to try to
release that data at all. Likely the best zero-copy approach in your
case is to use frag_list, but be ready that your netwrok will regularily
stall - when hardware buffers are all in use and not yet freed, you will
not be able to send/receive new packets, although amount of memory will
allow that.
> -Vinay
--
Evgeniy Polyakov
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