patches for DPDK stable branches
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From: Thinh Tran <thinhtr@linux.vnet.ibm.com>
To: dev@dpdk.org, stable@dpdk.org
Cc: david.marchand@redhat.com, drc@linux.vnet.ibm.com,
	Thinh Tran <thinhtr@linux.vnet.ibm.com>
Subject: [dpdk-stable] [PATCH v3] eal/ppc64: improve rte_rdtsc() with __ppc_get_timebase()
Date: Tue, 24 Mar 2020 20:13:56 -0400
Message-ID: <20200325001356.147049-1-thinhtr@linux.vnet.ibm.com> (raw)

  __ppc_get_timebase() reads and returns the current value of the Time 
  Base Register. It's more efficient as it uses the processor’s time  
  base facility directly 

  the DPDK on FreeBSD currently is not supported on Powerpc64, it should
  be safe to include the sys/platform/ppc.h


Signed-off-by: Thinh Tran <thinhtr@linux.vnet.ibm.com>
---
 .../common/include/arch/ppc_64/rte_cycles.h   | 28 ++-----------------
 1 file changed, 2 insertions(+), 26 deletions(-)

diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
index 8f2e98642..871f9b6e4 100644
--- a/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_cycles.h
@@ -14,6 +14,7 @@ extern "C" {
 
 #include <rte_byteorder.h>
 #include <rte_common.h>
+#include <sys/platform/ppc.h>
 
 /**
  * Read the time base register.
@@ -24,32 +25,7 @@ extern "C" {
 static inline uint64_t
 rte_rdtsc(void)
 {
-	union {
-		uint64_t tsc_64;
-		RTE_STD_C11
-		struct {
-#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
-			uint32_t hi_32;
-			uint32_t lo_32;
-#else
-			uint32_t lo_32;
-			uint32_t hi_32;
-#endif
-		};
-	} tsc;
-	uint32_t tmp;
-
-	asm volatile(
-			"0:\n"
-			"mftbu   %[hi32]\n"
-			"mftb    %[lo32]\n"
-			"mftbu   %[tmp]\n"
-			"cmpw    %[tmp],%[hi32]\n"
-			"bne     0b\n"
-			: [hi32] "=r"(tsc.hi_32), [lo32] "=r"(tsc.lo_32),
-			[tmp] "=r"(tmp)
-		    );
-	return tsc.tsc_64;
+	return __ppc_get_timebase();
 }
 
 static inline uint64_t
-- 
2.17.0


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