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From: Jianbo Liu <jianbo.liu@arm.com>
To: Yongseok Koh <yskoh@mellanox.com>
Cc: adrien.mazarguil@6wind.com, nelio.laranjeiro@6wind.com,
	jerin.jacob@caviumnetworks.com, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 1/8] eal: introduce DMA memory barriers
Date: Tue, 16 Jan 2018 10:47:07 +0800	[thread overview]
Message-ID: <20180116024706.GA14652@arm.com> (raw)
In-Reply-To: <20180116011050.18866-2-yskoh@mellanox.com>

The 01/15/2018 17:10, 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@mellanox.com>

Acked-by: Jianbo Liu <jianbo.liu@arm.com>

> ---
>  lib/librte_eal/common/include/generic/rte_atomic.h | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/lib/librte_eal/common/include/generic/rte_atomic.h b/lib/librte_eal/common/include/generic/rte_atomic.h
> index 16af5ca57..2e0503ce6 100644
> --- a/lib/librte_eal/common/include/generic/rte_atomic.h
> +++ b/lib/librte_eal/common/include/generic/rte_atomic.h
> @@ -98,6 +98,24 @@ static inline void rte_io_wmb(void);
>   */
>  static inline void rte_io_rmb(void);
>
> +/**
> + * Write memory barrier for coherent memory between lcore and IO device
> + *
> + * Guarantees that the STORE operations on coherent memory that
> + * precede the rte_dma_wmb() call are visible to I/O device before the
> + * STORE operations that follow it.
> + */
> +static inline void rte_dma_wmb(void);
> +
> +/**
> + * Read memory barrier for coherent memory between lcore and IO device
> + *
> + * Guarantees that the LOAD operations on coherent memory updated by
> + * IO device that precede the rte_dma_rmb() call are visible to CPU
> + * before the LOAD operations that follow it.
> + */
> +static inline void rte_dma_rmb(void);
> +
>  #endif /* __DOXYGEN__ */
>
>  /**
> --
> 2.11.0
>

--
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  reply	other threads:[~2018-01-16  2:48 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-27  4:28 [dpdk-dev] [PATCH 1/2] eal/arm64: modify I/O device " Yongseok Koh
2017-12-27  4:28 ` [dpdk-dev] [PATCH 2/2] net/mlx5: fix synchonization on polling Rx completions Yongseok Koh
2018-01-04 12:58 ` [dpdk-dev] [PATCH 1/2] eal/arm64: modify I/O device memory barriers Jerin Jacob
2018-01-08  1:55 ` Jianbo Liu
2018-01-16  0:42   ` Yongseok Koh
2018-01-16  1:10 ` [dpdk-dev] [PATCH v2 0/8] introduce DMA " Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 1/8] eal: " Yongseok Koh
2018-01-16  2:47     ` Jianbo Liu [this message]
2018-01-16  7:49     ` Andrew Rybchenko
2018-01-16  9:10       ` Jianbo Liu
2018-01-17 13:46         ` Thomas Monjalon
2018-01-17 18:39           ` Yongseok Koh
2018-01-18 11:56             ` Andrew Rybchenko
2018-01-18 18:14               ` Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 2/8] eal/x86: define " Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 3/8] eal/ppc64: define DMA device " Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 4/8] eal/armv7: define DMA " Yongseok Koh
2018-01-16  2:48     ` Jianbo Liu
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 5/8] eal/arm64: " Yongseok Koh
2018-01-16  2:50     ` Jianbo Liu
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 6/8] net/mlx5: remove unnecessary memory barrier Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 7/8] net/mlx5: replace IO memory barrier with DMA " Yongseok Koh
2018-01-16  1:10   ` [dpdk-dev] [PATCH v2 8/8] net/mlx5: fix synchonization on polling Rx completions Yongseok Koh
2018-01-16  3:53     ` Jianbo Liu
2018-01-19  0:44   ` [dpdk-dev] [PATCH v3 0/8] introduce DMA memory barriers Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 1/8] eal: " Yongseok Koh
2018-01-19  7:16       ` Andrew Rybchenko
2018-01-22 18:29         ` Yongseok Koh
2018-01-22 20:59           ` Thomas Monjalon
2018-01-23  4:35           ` Jerin Jacob
2018-01-25 19:08             ` Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 2/8] eal/x86: define " Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 3/8] eal/ppc64: " Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 4/8] eal/armv7: " Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 5/8] eal/arm64: " Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 6/8] net/mlx5: remove unnecessary memory barrier Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 7/8] net/mlx5: replace IO memory barrier with DMA " Yongseok Koh
2018-01-19  0:44     ` [dpdk-dev] [PATCH v3 8/8] net/mlx5: fix synchonization on polling Rx completions Yongseok Koh
2018-01-25 21:02     ` [dpdk-dev] [PATCH v4 0/9] introduce coherent I/O memory barriers Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 1/9] eal: add Doxygen grouping for " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 2/9] eal: introduce coherent I/O " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 3/9] eal/x86: define " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 4/9] eal/ppc64: " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 5/9] eal/armv7: " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 6/9] eal/arm64: " Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 7/9] net/mlx5: remove unnecessary memory barrier Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 8/9] net/mlx5: replace I/O memory barrier with coherent version Yongseok Koh
2018-01-25 21:02       ` [dpdk-dev] [PATCH v4 9/9] net/mlx5: fix synchronization on polling Rx completions Yongseok Koh
2018-01-28  7:32       ` [dpdk-dev] [PATCH v4 0/9] introduce coherent I/O memory barriers Thomas Monjalon

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