This is a cmpxchg ring that could potentially be used to replace the spinlock
variant of skb_array.
Couple comments its missing a resize operator which would need to be added
before it could be a drop in replacement. And although I tested the first
patch with my latest set of qdisc updates the second patch I have not tested
for a bit so it may or may not work but it illustrates the idea at least.
This was derived from the DPDK documentation where there is a description
of the cmpxchg ring presumably used there. It may or may not actually align
with what is done in DPDK implementation I have no idea I didn't look.
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John Fastabend (2):
net: use cmpxchg instead of spinlock in ptr rings
ptr_ring_ll: pop/push multiple objects at once
include/linux/netdevice.h | 12 ----
include/linux/ptr_ring_ll.h | 146 +++++++++++++++++++++++++++++++++++++++++++
include/linux/skb_array.h | 32 +++++++++
net/core/dev.c | 18 +----
net/sched/sch_generic.c | 86 +++++++++++++------------
5 files changed, 224 insertions(+), 70 deletions(-)
create mode 100644 include/linux/ptr_ring_ll.h
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