mbuf and sk_buf

Hi,
I'm porting code which is in eCos OS to embeded linux ( Monta vista
linux).
here in eCos he is using "mBuf" for buffer management and now i need
to port it to "sk_buff"  which is used in linux.

Now anybody can tell me or guide me, how to go about transfering the
data which is mBuf to sk_buff..

Coz sk_buff is allocates in one linear space.
But where as mBuf is in chain.

N moreover the mBuf is not same as sk_buff in element wise so

* how can i transfer the data frame comming n filling the mBuf into
sk_buff.

Thank you in advance.

-Chidu