From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Helin Zhang <helin.zhang@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] i40e: fix the issue of wrongly reporting descriptor done
Date: Sun, 02 Aug 2015 23:57:08 +0200 [thread overview]
Message-ID: <1767019.fJcHX0QXRP@xps13> (raw)
In-Reply-To: <1438207699-11848-1-git-send-email-helin.zhang@intel.com>
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@intel.com>
Applied, thanks
prev parent reply other threads:[~2015-08-02 21:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 22:08 Helin Zhang
2015-08-02 21:57 ` Thomas Monjalon [this message]
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