Re: alignment faults in 3.6

On Thu, 2012-10-11 at 13:28 +0200, Eric Dumazet wrote:

You probably are aware that a driver can use : 

- a fragment to hold the frame given by the hardware, with whatever
alignment is needed by the hardware.

Then allocate an skb with enough room (128 bytes) to pull the headers as
needed later.

skb = netdev_alloc_skb_ip_align(dev, 128);

What happen at tx time, supposing that same hardware cannot do SG ?

Aren't we going to memcpy the data into the head ?

-- 
Maxime