Re: [RFC][PATCH 4/5] I/OAT DMA support and TCP acceleration

From: Chris Leech <redacted>
Date: Tue, 20 Dec 2005 23:10:07 -0800

 That could be a good way to deal with it.  Actually, I should double
check the length of tcp_skb_cb.  I took a quick look and thought that
there might be some room left there anyway, even though the comment in
tcp.h says otherwise.

There isn't, it's basically full on 64-bit systems with ipv6 enabled.

Just put the DMA cookie object explicitly into struct sk_buff,
protected by CONFIG_NET_DMA.