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Matteo Croce says: ==================== page_pool: recycle buffers This is a respin of [1] This patchset shows the plans for allowing page_pool to handle and maintain DMA map/unmap of the pages it serves to the driver. For this to work a return hook in the network core is introduced. The overall purpose is to simplify drivers, by providing a page allocation API that does recycling, such that each driver doesn't have to reinvent its own recycling scheme. Using page_pool in a driver does not require implementing XDP support, but it makes it trivially easy to do so. Instead of allocating buffers specifically for SKBs we now allocate a generic buffer and either wrap it on an SKB (via build_skb) or create an XDP frame. The recycling code leverages the XDP recycle APIs. The Marvell mvpp2 and mvneta drivers are used in this patchset to demonstrate how to use the API, and tested on a MacchiatoBIN and EspressoBIN boards respectively. Please let this going in on a future -rc1 so to allow enough time to have wider tests. v7 -> v8: - use page->lru.next instead of page->index for pfmemalloc - remove conditional include - rework page_pool_return_skb_page() so to have less conversions between page and addresses, and call compound_head() only once - move some code from skb_free_head() to a new helper skb_pp_recycle() - misc fixes v6 -> v7: - refresh patches against net-next - remove a redundant call to virt_to_head_page() - update mvneta benchmarks v5 -> v6: - preserve pfmemalloc bit when setting signature - fix typo in mvneta - rebase on next-next with the new cache - don't clear the skb->pp_recycle in pskb_expand_head() v4 -> v5: - move the signature so it doesn't alias with page->mapping - use an invalid pointer as magic - incorporate Matthew Wilcox's changes for pfmemalloc pages - move the __skb_frag_unref() changes to a preliminary patch - refactor some cpp directives - only attempt recycling if skb->head_frag - clear skb->pp_recycle in pskb_expand_head() v3 -> v4: - store a pointer to page_pool instead of xdp_mem_info - drop a patch which reduces xdp_mem_info size - do the recycling in the page_pool code instead of xdp_return - remove some unused headers include - remove some useless forward declaration v2 -> v3: - added missing SOBs - CCed the MM people v1 -> v2: - fix a commit message - avoid setting pp_recycle multiple times on mvneta - squash two patches to avoid breaking bisect ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.