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From: David Harton <dharton@cisco.com>
To: dev@dpdk.org
Cc: wenzhuo.lu@intel.com, konstantin.ananyev@intel.com,
	xiaolong.ye@intel.com,  David Harton <dharton@cisco.com>,
	intel.com@cisco.com
Subject: [dpdk-dev] [PATCH v2] net/ixgbevf: update VF_STAT macros to handle rollover
Date: Sun, 26 Jan 2020 12:32:01 -0500
Message-ID: <20200126173201.19433-1-dharton@cisco.com> (raw)
In-Reply-To: <20191211023836.16272-1-dharton@cisco.com>

Added rollover logic to UPDATE_VF_STAT and UPDATE_VF_STAT_36BIT macros.

Fixes: af75078fece3 ("first public release")
Cc: intel.com

Signed-off-by: David Harton <dharton@cisco.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 49285ce53..bc73ad195 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -385,7 +385,11 @@ static void ixgbe_l2_tunnel_conf(struct rte_eth_dev *dev);
 #define UPDATE_VF_STAT(reg, last, cur)                          \
 {                                                               \
 	uint32_t latest = IXGBE_READ_REG(hw, reg);              \
-	cur += (latest - last) & UINT_MAX;                      \
+	if (latest >= last)                                     \
+		cur += (latest - last);                         \
+	else                                                    \
+		cur += ((latest + ((uint64_t)1 << 32)) - last); \
+	cur &= UINT_MAX;                                        \
 	last = latest;                                          \
 }
 
@@ -394,7 +398,11 @@ static void ixgbe_l2_tunnel_conf(struct rte_eth_dev *dev);
 	u64 new_lsb = IXGBE_READ_REG(hw, lsb);                   \
 	u64 new_msb = IXGBE_READ_REG(hw, msb);                   \
 	u64 latest = ((new_msb << 32) | new_lsb);                \
-	cur += (0x1000000000LL + latest - last) & 0xFFFFFFFFFLL; \
+	if (latest >= last)                                      \
+		cur += (latest - last);                          \
+	else                                                     \
+		cur += ((latest + ((u64)1 << 36)) - last);       \
+	cur &= 0xFFFFFFFFFLL;                                    \
 	last = latest;                                           \
 }
 
-- 
2.19.1


  parent reply	other threads:[~2020-01-26 17:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11  2:38 [dpdk-dev] [PATCH] " David Harton
2020-01-26  9:42 ` Ye Xiaolong
2020-01-26 17:13 ` Stephen Hemminger
2020-01-26 17:32 ` David Harton [this message]
2020-01-29  7:53   ` [dpdk-dev] [PATCH v2] " Ye Xiaolong
2020-01-29 11:22   ` Ferruh Yigit
2020-01-29 17:57     ` David Harton (dharton)

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