From ff7d6b27f894f1469dc51ccb828b7363ccd9799f Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Tue, 17 Apr 2018 16:46:17 +0200 Subject: page_pool: refurbish version of page_pool code Need a fast page recycle mechanism for ndo_xdp_xmit API for returning pages on DMA-TX completion time, which have good cross CPU performance, given DMA-TX completion time can happen on a remote CPU. Refurbish my page_pool code, that was presented[1] at MM-summit 2016. Adapted page_pool code to not depend the page allocator and integration into struct page. The DMA mapping feature is kept, even-though it will not be activated/used in this patchset. [1] http://people.netfilter.org/hawk/presentations/MM-summit2016/generic_page_pool_mm_summit2016.pdf V2: Adjustments requested by Tariq - Changed page_pool_create return codes, don't return NULL, only ERR_PTR, as this simplifies err handling in drivers. V4: many small improvements and cleanups - Add DOC comment section, that can be used by kernel-doc - Improve fallback mode, to work better with refcnt based recycling e.g. remove a WARN as pointed out by Tariq e.g. quicker fallback if ptr_ring is empty. V5: Fixed SPDX license as pointed out by Alexei V6: Adjustments requested by Eric Dumazet - Adjust ____cacheline_aligned_in_smp usage/placement - Move rcu_head in struct page_pool - Free pages quicker on destroy, minimize resources delayed an RCU period - Remove code for forward/backward compat ABI interface V8: Issues found by kbuild test robot - Address sparse should be static warnings - Only compile+link when a driver use/select page_pool, mlx5 selects CONFIG_PAGE_POOL, although its first used in two patches Signed-off-by: Jesper Dangaard Brouer Signed-off-by: David S. Miller --- net/Kconfig | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/Kconfig') diff --git a/net/Kconfig b/net/Kconfig index 0428f12c25c2..6fa1a4493b8c 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -423,6 +423,9 @@ config MAY_USE_DEVLINK on MAY_USE_DEVLINK to ensure they do not cause link errors when devlink is a loadable module and the driver using it is built-in. +config PAGE_POOL + bool + endif # if NET # Used by archs to tell that they support BPF JIT compiler plus which flavour. -- cgit v1.2.3