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 <ys...@mellanox.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
