[PATCH net-next v3 2/2] net: xilinx: axienet: Add statistics support
Jakub Kicinski
kuba at kernel.org
Fri Aug 16 19:42:03 PDT 2024
On Thu, 15 Aug 2024 10:40:31 -0400 Sean Anderson wrote:
> + u64 hw_stat_base[STAT_COUNT];
> + u64 hw_last_counter[STAT_COUNT];
I think hw_last_counter has to be u32..
> + seqcount_mutex_t hw_stats_seqcount;
> + struct mutex stats_lock;
> + struct delayed_work stats_work;
> + bool reset_in_progress;
> +
> struct work_struct dma_err_task;
>
> int tx_irq;
> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> index b2d7c396e2e3..9353a4f0ab1b 100644
> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> @@ -519,11 +519,55 @@ static void axienet_setoptions(struct net_device *ndev, u32 options)
> lp->options |= options;
> }
>
> +static u64 axienet_stat(struct axienet_local *lp, enum temac_stat stat)
> +{
> + u32 counter;
> +
> + if (lp->reset_in_progress)
> + return lp->hw_stat_base[stat];
> +
> + counter = axienet_ior(lp, XAE_STATS_OFFSET + stat * 8);
> + return lp->hw_stat_base[stat] + (counter - lp->hw_last_counter[stat]);
.. or you need to cast the (counter - lp->...) result to u32.
Otherwise counter's type is getting bumped to 64 and you're just doing
64b math here.
> +}
> +
> +static void axienet_stats_update(struct axienet_local *lp, bool reset)
> +{
> + enum temac_stat stat;
> +
> + write_seqcount_begin(&lp->hw_stats_seqcount);
> + lp->reset_in_progress = reset;
> + for (stat = 0; stat < STAT_COUNT; stat++) {
> + u32 counter = axienet_ior(lp, XAE_STATS_OFFSET + stat * 8);
> +
> + lp->hw_stat_base[stat] += counter - lp->hw_last_counter[stat];
> + lp->hw_last_counter[stat] = counter;
> + }
> + write_seqcount_end(&lp->hw_stats_seqcount);
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