bugs in rte_pktmbuf_copy

[Morten Brørup]

While working on a rte_pktmbuf_copy_bulk() function, I noticed a couple of bugs in rte_pktmbuf_copy():

1. If the copy is allocated from a mempool using pinned external buffers, the copy's RTE_MBUF_F_EXTERNAL flag is lost.
This is simple to fix:

-	/* copied mbuf is not indirect or external */
-	mc->ol_flags = m->ol_flags & ~(RTE_MBUF_F_INDIRECT|RTE_MBUF_F_EXTERNAL);
+	/* copy flags except indirect and external */
+	mc->ol_flags |= m->ol_flags & ~(RTE_MBUF_F_INDIRECT|RTE_MBUF_F_EXTERNAL);

2. If the packet is copied with non-zero offset, much of the metadata do not apply to the copy, e.g. many of the offload flags and the packet_type field.
Maybe metadata should be reset when copying with a non-zero offset?
Or maybe rte_pktmbuf_copy() should be considered "payload copy", so the copy should have all metadata reset?


Venlig hilsen / Kind regards,
-Morten Brørup