2011/11/9 Ian Campbell <ian.campbell@xxxxxxxxxx>:
> This requires adding a new argument to various sendpage hooks up and down the
> stack. At the moment this parameter is always NULL.
[...]
> --- a/include/linux/net.h
> +++ b/include/linux/net.h
> @@ -203,6 +204,7 @@ struct proto_ops {
> ssize_t (*sendpage) (struct socket *sock, struct page *page,
> + struct skb_frag_destructor *destroy,
> int offset, size_t size, int flags);
Maybe you could instead add new op like sendfrag() that would get
already prepared skb_frag_struct? In the end all page data ends up
described in skb_frag_struct, so this would reduce copying this
information all over network stack. This might be a bigger change,
though.
Best Regards,
Michał Mirosław
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