David Arinzon a087d4b502 net: ena: Add dynamic recycling mechanism for rx buffers ... [ Upstream commit f7d625adeb ] The current implementation allocates page-sized rx buffers. As traffic may consist of different types and sizes of packets, in various cases, buffers are not fully used. This change (Dynamic RX Buffers - DRB) uses part of the allocated rx page needed for the incoming packet, and returns the rest of the unused page to be used again as an rx buffer for future packets. A threshold of 2K for unused space has been set in order to declare whether the remainder of the page can be reused again as an rx buffer. As a page may be reused, dma_sync_single_for_cpu() is added in order to sync the memory to the CPU side after it was owned by the HW. In addition, when the rx page can no longer be reused, it is being unmapped using dma_page_unmap(), which implicitly syncs and then unmaps the entire page. In case the kernel still handles the skbs pointing to the previous buffers from that rx page, it may access garbage pointers, caused by the implicit sync overwriting them. The implicit dma sync is removed by replacing dma_page_unmap() with dma_unmap_page_attrs() with DMA_ATTR_SKIP_CPU_SYNC flag. The functionality is disabled for XDP traffic to avoid handling several descriptors per packet. Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com> Signed-off-by: Shay Agroskin <shayagr@amazon.com> Signed-off-by: David Arinzon <darinzon@amazon.com> Link: https://lore.kernel.org/r/20230612121448.28829-1-darinzon@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Stable-dep-of: 2dc8b1e7177d ("net: ena: Fix redundant device NUMA node override") Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-16 13:39:52 +02:00
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cellular	docs: networking: Add documentation for MAPv5	2021-06-01 17:11:41 -07:00
ethernet	net: ena: Add dynamic recycling mechanism for rx buffers	2024-06-16 13:39:52 +02:00
fddi	FDDI: defza: Update my e-mail address	2021-03-10 12:45:16 -08:00
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wwan	net: wwan: iosm: Fix htmldocs warnings	2021-06-15 11:50:10 -07:00
index.rst	net: iosm: infrastructure	2021-06-13 13:49:39 -07:00