On 05/05/16 08:40, Ilya Matveychikov wrote: > Hello folks, > > While working with fragmented SKBs we've got stuck with the following: > - is it possible for an SKB fragment in skb_shinfo(skb)->frag_list to > be fragmented too (i.e. to have SKBs in frag_list)? > - do skb->len and skb->data_len contain the whole SKB length, > including the length of all fragments (not only the paged parts)? > > Is there any docs except the kernel sources itself to refer to? davem has some docs up at http://vger.kernel.org/~davem/skb.html and http://vger.kernel.org/~davem/skb_data.html In particular note the following: "The frag_list is used to maintain a chain of SKBs organized for fragmentation purposes, it is _not_ used for maintaining paged data." So my reading would suggest there is no way to multiple-layer-fragment an SKB; the frags are page pointers and offsets, not entire sk_buff structs in their own right.
-Ed
