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authorJesper Dangaard Brouer <brouer@redhat.com>2018-04-17 16:46:17 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-17 10:50:29 -0400
commitff7d6b27f894f1469dc51ccb828b7363ccd9799f (patch)
tree933191e4e40bed2e547d4cce3ca7d00a536e1b01 /net/Kconfig
parentxdp: rhashtable with allocator ID to pointer mapping (diff)
downloadlinux-dev-ff7d6b27f894f1469dc51ccb828b7363ccd9799f.tar.xz
linux-dev-ff7d6b27f894f1469dc51ccb828b7363ccd9799f.zip
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 <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/Kconfig')
-rw-r--r--net/Kconfig3
1 files changed, 3 insertions, 0 deletions
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.