[dpdk-dev] [PATCH v3 1/8] eal: introduce DMA memory barriers
Jerin Jacob
jerin.jacob at caviumnetworks.com
Tue Jan 23 05:35:28 CET 2018
-----Original Message-----
> Date: Mon, 22 Jan 2018 18:29:31 +0000
> From: Yongseok Koh <yskoh at mellanox.com>
> To: Andrew Rybchenko <arybchenko at solarflare.com>, Thomas Monjalon
> <thomas at monjalon.net>, "jianbo.liu at arm.com" <jianbo.liu at arm.com>, Jerin
> Jacob <jerin.jacob at caviumnetworks.com>
> CC: Adrien Mazarguil <adrien.mazarguil at 6wind.com>, Nélio Laranjeiro
> <nelio.laranjeiro at 6wind.com>, "bruce.richardson at intel.com"
> <bruce.richardson at intel.com>, "Ananyev, Konstantin"
> <konstantin.ananyev at intel.com>, Chao Zhu <chaozhu at linux.vnet.ibm.com>,
> "dev at dpdk.org" <dev at dpdk.org>
> Subject: Re: [dpdk-dev] [PATCH v3 1/8] eal: introduce DMA memory barriers
>
>
> > On Jan 18, 2018, at 11:16 PM, Andrew Rybchenko <arybchenko at solarflare.com> wrote:
> >
> > On 01/19/2018 03:44 AM, Yongseok Koh wrote:
> >> This commit introduces rte_dma_wmb() and rte_dma_rmb(), in order to
> >> guarantee the ordering of coherent shared memory between the CPU and a DMA
> >> capable device.
> >>
> >> Signed-off-by: Yongseok Koh
> >> <yskoh at mellanox.com>
> >
> > Acked-by: Andrew Rybchenko <arybchenko at solarflare.com>
> >
> > It is already really good. Many thanks.
>
> Thank you!
>
> > Maybe it would be useful to:
> > - avoid duplication of so long explanations (put in in one place and add reference?)
>
> May have to ask Thomas how to do this. Thomas?
>
> > - explain why it is bound to DMA or call it in a different way, since right now it is bound
> > to coherent-mapped IO (rte_cio_rmb() ?). Yes, I see benefits to follow Linux
> > terminology, but may be DPDK can do better :) I just add my concerns, but let
> > EAL code maintainers to decide
>
> Good idea. Like to hear from other people. But, following linux terms sometime
> could be good to welcome developers from kernel community to DPDK world. :-)
>
> To people in the cc list, any other concerns?
> Especially ARM users - Jianbo and Jerin?
I like Andrew's suggestion. IMO, rte_cio_?mb() makes more sense.
>
> Thanks,
> Yongseok
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