[dpdk-dev] [PATCH] e1000: fix the issue of wrongly reporting descriptor done
thomas.monjalon at 6wind.com
Sun Aug 2 23:55:10 CEST 2015
2015-07-30 10:39, Wenzhuo Lu:
> Header buffer address for header split will be filled with the physical
> address for DMA, which is actually not needed at all, as header split
> hasn't been supported. Hardware requires the least bit of header address
> which is 'Descriptor Done' bit when write back should be set to 0 by driver.
> The issue is that if the user wants to reserve an odd number of bytes between
> the mbuf header and data buffer, the physical address to be filled in the
> descriptor would happen to be odd. That means the DD bit would be set to
> non-zero by driver. That will result in reporting descriptor done wrongly.
> Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
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