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* [dpdk-dev] [PATCH 1/1] net/ixgbevf: fix stats update after a PF reset
       [not found] <cover.1568216743.git.thierry.herbelot@6wind.com>
@ 2019-09-11 16:00 ` Thierry Herbelot
  2019-09-17  3:16   ` Zhang, Qi Z
  0 siblings, 1 reply; 2+ messages in thread
From: Thierry Herbelot @ 2019-09-11 16:00 UTC (permalink / raw)
  To: dev; +Cc: Guo Fengtian, Thomas Monjalon, stable, wenzhuo.lu, konstantin.ananyev

From: Guo Fengtian <fengtian.guo@6wind.com>

When PF is set down, in VF, the value of stats register is zero.
So only increase stats when it's non zero.

Fixes: af75078fece3 ('first public release')
Cc: stable@dpdk.org
Cc: wenzhuo.lu@intel.com
Cc: konstantin.ananyev@intel.com

Signed-off-by: Guo Fengtian <fengtian.guo@6wind.com>
---
 drivers/net/ixgbe/ixgbe_ethdev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 7eb3d0567b58..27c540f60563 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -385,7 +385,8 @@ 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)                                             \
+		cur += (latest - last) & UINT_MAX;              \
 	last = latest;                                          \
 }
 
@@ -394,7 +395,8 @@ 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)                                              \
+		cur += (0x1000000000LL + latest - last) & 0xFFFFFFFFFLL;\
 	last = latest;                                           \
 }
 
-- 
2.20.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [dpdk-dev] [PATCH 1/1] net/ixgbevf: fix stats update after a PF reset
  2019-09-11 16:00 ` [dpdk-dev] [PATCH 1/1] net/ixgbevf: fix stats update after a PF reset Thierry Herbelot
@ 2019-09-17  3:16   ` Zhang, Qi Z
  0 siblings, 0 replies; 2+ messages in thread
From: Zhang, Qi Z @ 2019-09-17  3:16 UTC (permalink / raw)
  To: Thierry Herbelot, dev
  Cc: Guo Fengtian, Thomas Monjalon, stable, Lu, Wenzhuo, Ananyev, Konstantin



> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thierry Herbelot
> Sent: Thursday, September 12, 2019 12:01 AM
> To: dev@dpdk.org
> Cc: Guo Fengtian <fengtian.guo@6wind.com>; Thomas Monjalon
> <thomas@monjalon.net>; stable@dpdk.org; Lu, Wenzhuo
> <wenzhuo.lu@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>
> Subject: [dpdk-dev] [PATCH 1/1] net/ixgbevf: fix stats update after a PF reset
> 
> From: Guo Fengtian <fengtian.guo@6wind.com>
> 
> When PF is set down, in VF, the value of stats register is zero.
> So only increase stats when it's non zero.
> 
> Fixes: af75078fece3 ('first public release')
> Cc: stable@dpdk.org
> Cc: wenzhuo.lu@intel.com
> Cc: konstantin.ananyev@intel.com
> 
> Signed-off-by: Guo Fengtian <fengtian.guo@6wind.com>
> ---
>  drivers/net/ixgbe/ixgbe_ethdev.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c
> b/drivers/net/ixgbe/ixgbe_ethdev.c
> index 7eb3d0567b58..27c540f60563 100644
> --- a/drivers/net/ixgbe/ixgbe_ethdev.c
> +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
> @@ -385,7 +385,8 @@ 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)                                             \
> +		cur += (latest - last) & UINT_MAX;              \

There is still a chance that PF is up but the latest reg read returns 0, since it's a cyclic counter, is any way to check the PF status directly?

>  	last = latest;                                          \
>  }
> 
> @@ -394,7 +395,8 @@ 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)                                              \
> +		cur += (0x1000000000LL + latest - last) & 0xFFFFFFFFFLL;\
>  	last = latest;                                           \
>  }
> 
> --
> 2.20.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

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     [not found] <cover.1568216743.git.thierry.herbelot@6wind.com>
2019-09-11 16:00 ` [dpdk-dev] [PATCH 1/1] net/ixgbevf: fix stats update after a PF reset Thierry Herbelot
2019-09-17  3:16   ` Zhang, Qi Z

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