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From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: nd@arm.com, david.marchand@redhat.com, konstantin.ananyev@intel.com,
thomas@monjalon.net, stephen@networkplumber.org, hemant.agrawal@nxp.com,
jerinj@marvell.com, pbhagavatula@marvell.com, Honnappa.Nagarahalli@arm.com,
ruifeng.wang@arm.com, phil.yang@arm.com, steve.capper@arm.com
Date: Sun, 27 Oct 2019 20:52:44 +0800
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Subject: [dpdk-dev] [PATCH v11 4/5] net/thunderx: use new API to save cycles
on aarch64
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Use the new API to wait in low power state instead of continuous
polling to save CPU cycles and power.
Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
---
drivers/net/thunderx/Makefile | 1 +
drivers/net/thunderx/meson.build | 1 +
drivers/net/thunderx/nicvf_rxtx.c | 3 +--
3 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/thunderx/Makefile b/drivers/net/thunderx/Makefile
index e6bf497..9e0de10 100644
--- a/drivers/net/thunderx/Makefile
+++ b/drivers/net/thunderx/Makefile
@@ -10,6 +10,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
LIB = librte_pmd_thunderx_nicvf.a
CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -DALLOW_EXPERIMENTAL_API
LDLIBS += -lm
LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
diff --git a/drivers/net/thunderx/meson.build b/drivers/net/thunderx/meson.build
index 69819a9..23d9458 100644
--- a/drivers/net/thunderx/meson.build
+++ b/drivers/net/thunderx/meson.build
@@ -4,6 +4,7 @@
subdir('base')
objs = [base_objs]
+allow_experimental_apis = true
sources = files('nicvf_rxtx.c',
'nicvf_ethdev.c',
'nicvf_svf.c'
diff --git a/drivers/net/thunderx/nicvf_rxtx.c b/drivers/net/thunderx/nicvf_rxtx.c
index 1c42874..90a6098 100644
--- a/drivers/net/thunderx/nicvf_rxtx.c
+++ b/drivers/net/thunderx/nicvf_rxtx.c
@@ -385,8 +385,7 @@ nicvf_fill_rbdr(struct nicvf_rxq *rxq, int to_fill)
ltail++;
}
- while (__atomic_load_n(&rbdr->tail, __ATOMIC_RELAXED) != next_tail)
- rte_pause();
+ rte_wait_until_equal_32(&rbdr->tail, next_tail, __ATOMIC_RELAXED);
__atomic_store_n(&rbdr->tail, ltail, __ATOMIC_RELEASE);
nicvf_addr_write(door, to_fill);
--
2.7.4