When does skbs get fragmented?

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I'm writing a small kernel module that is similar to a Ethernet device
and it receives skbs from the kernel.  I'd like to generate some skbs
fragments (i.e. skb_shinfo(skb)->nr_frag > 0) to test my module, but I
know how.

If you can help, I'd highly appreciate it.  Basically, I'd like to know
under what
circumstances my driver can get fragmented skbs in its

(I tried to send it large packet > than the Ethernet frame size, but
that didn't
seem to work.)

Please post or email, I'll summarize any responses received:

frank_6014 @ yahoo dot com.

-Frank H.

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