net/ixgbevf: update VF_STAT macros to handle rollover
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Commit Message
Added rollover logic to UPDATE_VF_STAT and UPDATE_VF_STAT_36BIT macros.
Signed-off-by: David Harton <dharton@cisco.com>
---
drivers/net/ixgbe/ixgbe_ethdev.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
Comments
On 12/10, David Harton wrote:
>Added rollover logic to UPDATE_VF_STAT and UPDATE_VF_STAT_36BIT macros.
>
>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
>o
Could you provide Fixes: tag and cc stable?
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>
On Tue, 10 Dec 2019 21:38:36 -0500
David Harton <dharton@cisco.com> wrote:
> Added rollover logic to UPDATE_VF_STAT and UPDATE_VF_STAT_36BIT macros.
>
> 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; \
> }
The overall approach looks fine.
The code is now long enough the macro should turn into an inline.
Also lots of (extra) parenthesis
@@ -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; \
}