netdev - Re: [patch net-next 12/12] mlxsw: spectrum_dpipe: Add support for controlling neighbor counters

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Date:   Thu, 24 Aug 2017 12:28:09 -0700
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, arkadis@...lanox.com, idosch@...lanox.com,
        mlxsw@...lanox.com
Subject: Re: [patch net-next 12/12] mlxsw: spectrum_dpipe: Add support for
 controlling neighbor counters

On 8/23/17 11:40 PM, Jiri Pirko wrote:
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c
> index 94d954b..3c8599f 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c
> @@ -599,6 +599,38 @@ mlxsw_sp_dpipe_table_host4_entries_dump(void *priv, bool counters_enabled,
>  						      dump_ctx, AF_INET);
>  }
>  
> +static void
> +mlxsw_sp_dpipe_table_host_counters_update(struct mlxsw_sp *mlxsw_sp,
> +					  bool enable, int type)
> +{
> +	int i;
> +
> +	rtnl_lock();

same question here. Why is rtnl lock needed?

> +	for (i = 0; i < MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_RIFS); i++) {
> +		struct mlxsw_sp_rif *rif = mlxsw_sp_rif_by_index(mlxsw_sp, i);
> +		struct mlxsw_sp_neigh_entry *neigh_entry;
> +
> +		if (!rif)
> +			continue;
> +		mlxsw_sp_rif_neigh_for_each(neigh_entry, rif) {
> +			if (mlxsw_sp_neigh_entry_type(neigh_entry) != type)
> +				continue;
> +			mlxsw_sp_neigh_entry_counter_update(mlxsw_sp,
> +							    neigh_entry,
> +							    enable);
> +		}
> +	}
> +	rtnl_unlock();