[dpdk-dev] [PATCH] i40e: fix the issue of wrongly reporting descriptor done
thomas.monjalon at 6wind.com
Sun Aug 2 23:57:08 CEST 2015
2015-07-30 06:08, Helin Zhang:
> 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: Helin Zhang <helin.zhang at intel.com>
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