[dpdk-dev] [PATCH v3 6/9] gpudev: add memory barrier

[Thomas Monjalon]

09/10/2021 03:53, eagostini at nvidia.com:
> From: Elena Agostini <eagostini at nvidia.com>
> 
> Add a function for the application to ensure the coherency
> of the writes executed by another device into the GPU memory.
> 
> Signed-off-by: Elena Agostini <eagostini at nvidia.com>
> ---
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Enforce a GPU memory write barrier.
> + *
> + * @param dev_id
> + *   Reference device ID.
> + *
> + * @return
> + *   0 on success, -rte_errno otherwise:
> + *   - ENODEV if invalid dev_id
> + *   - ENOTSUP if operation not supported by the driver
> + *   - EPERM if driver error
> + */
> +__rte_experimental
> +int rte_gpu_mbw(int16_t dev_id);

I would replace mbw with wmb.

Also it may be worth adding few more words about the goal:
ensure that previous writes in GPU memory are complete?
Does it work for writes done from CPU? from GPU?