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Lorenzo Bianconi says: ==================== add DMA-sync-for-device capability to page_pool API Introduce the possibility to sync DMA memory for device in the page_pool API. This feature allows to sync proper DMA size and not always full buffer (dma_sync_single_for_device can be very costly). Please note DMA-sync-for-CPU is still device driver responsibility. Relying on page_pool DMA sync mvneta driver improves XDP_DROP pps of about 170Kpps: - XDP_DROP DMA sync managed by mvneta driver: ~420Kpps - XDP_DROP DMA sync managed by page_pool API: ~585Kpps Do not change naming convention for the moment since the changes will hit other drivers as well. I will address it in another series. Changes since v4: - do not allow the driver to set max_len to 0 - convert PP_FLAG_DMA_MAP/PP_FLAG_DMA_SYNC_DEV to BIT() macro Changes since v3: - move dma_sync_for_device before putting the page in ptr_ring in __page_pool_recycle_into_ring since ptr_ring can be consumed concurrently. Simplify the code moving dma_sync_for_device before running __page_pool_recycle_direct/__page_pool_recycle_into_ring Changes since v2: - rely on PP_FLAG_DMA_SYNC_DEV flag instead of dma_sync Changes since v1: - rename sync in dma_sync - set dma_sync_size to 0xFFFFFFFF in page_pool_recycle_direct and page_pool_put_page routines - Improve documentation ==================== Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.