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Hi Bruce,

Thank you for your comments and you're right.

My apologies=A1=AAsince this patch was submitted some time ago, I lost trac= k of the context when sending v2 and made an incorrect modification. I'll r= emove the erroneous code.

Regards

Zhichao


=B7=A2=BC=FE=C8=CB: Richardson, Bruce <bruce.richardson@inte= l.com>
=D2=D1=B7=A2=CB=CD: 2025 =C4=EA 11 =D4=C2 12 =C8=D5 =D0=C7=C6= =DA=C8=FD 20:04
=CA=D5=BC=FE=C8=CB: Zeng, ZhichaoX <zhichaox.zeng@intel.com&= gt;
=B3=AD=CB=CD: dev@dpdk.org <dev@dpdk.org>; stable@dpdk.or= g <stable@dpdk.org>; Burakov, Anatoly <anatoly.burakov@intel.com&g= t;; Jeff Guo <jia.guo@intel.com>; Ferruh Yigit <ferruh.yigit@amd.c= om>; Wenzhuo Lu <wenzhuo.lu@intel.com>
=D6=F7=CC=E2: Re: [PATCH v2] net/ice: fix statistics read error=

On Mon, Nov 10, 2025 at 04:05:14PM +0800, Z= hichao Zeng wrote:
> The statistics contain 40 bits. The lower 32 bits are read first, foll= owed
> by the upper 8 bits.
>
> In some cases, after reading the lower 32 bits, a carry occurs from > the lower bits, which causes the final statistics to be incorrect.
>
> This commit fixes this issue.
>
> Fixes: a37bde56314d ("net/ice: support statistics")
> Cc: stable@dpdk.org
>
> Signed-off-by: Zhichao Zeng <zhichaox.zeng@intel.com>
>
> ---
> v2: replace single retries with loops
> ---
>  drivers/net/intel/ice/ice_ethdev.c | 18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/intel/ice/ice_ethdev.c b/drivers/net/intel/ic= e/ice_ethdev.c
> index 4669eba7c7..016b25c63a 100644
> --- a/drivers/net/intel/ice/ice_ethdev.c
> +++ b/drivers/net/intel/ice/ice_ethdev.c
> @@ -6351,10 +6351,16 @@ ice_stat_update_40(struct ice_hw *hw,
>            = ;       uint64_t *stat)
>  {
>        uint64_t new_data;
> +     uint32_t lo_old, hi, lo;
> 
> -     new_data =3D (uint64_t)ICE_READ_REG(hw, lore= g);
> -     new_data |=3D (uint64_t)(ICE_READ_REG(hw, hi= reg) & ICE_8_BIT_MASK) <<
> -           &nb= sp;     ICE_32_BIT_WIDTH;
> +     do {
> +           &nb= sp; lo_old =3D ICE_READ_REG(hw, loreg);
> +           &nb= sp; hi =3D ICE_READ_REG(hw, hireg);
> +           &nb= sp; lo =3D ICE_READ_REG(hw, loreg);
> +     } while (lo_old > lo);
> +
> +     new_data =3D (uint64_t)lo;
> +     new_data |=3D (uint64_t)(hi & ICE_8_BIT_= MASK) << ICE_32_BIT_WIDTH;
> 
>        if (!offset_loaded)
>            = ;    *offset =3D new_data;
> @@ -6363,10 +6369,8 @@ ice_stat_update_40(struct ice_hw *hw,
>            = ;    *stat =3D new_data - *offset;
>        else
>            = ;    *stat =3D (uint64_t)((new_data +
> -           &nb= sp;            =          ((uint64_t)1 << ICE_= 40_BIT_WIDTH)) -
> -           &nb= sp;            =         *offset);
> -
> -     *stat &=3D ICE_40_BIT_MASK;
> +           &nb= sp;            =              ((= uint64_t)1 << ICE_32_BIT_WIDTH))
> +           &nb= sp;            =         - *offset);

This part wasn't in v1, was it? It looks wrong to me, and the original code=
looks correct. Given that offset and new_data should both be 40-bit
quantities, any wraparound would be at 40-bits rather than 32-bits no? Can<= br> you explain why we would use a 32-bit shift here?

>  }
> 
>  /**
> --
> 2.34.1
>
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