netdev - Re: [PATCH net-next] bnxt_en: Fix 2 stray ethtool -S counters

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Date: Thu, 26 Oct 2023 12:36:37 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: Michael Chan <michael.chan@...adcom.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <gospo@...adcom.com>, Ajit Khaparde
	<ajit.khaparde@...adcom.com>
Subject: Re: [PATCH net-next] bnxt_en: Fix 2 stray ethtool -S counters

On 26.10.2023 03:32, Michael Chan wrote:
> The recent firmware interface change has added 2 counters in struct
> rx_port_stats_ext. This caused 2 stray ethtool counters to be
> displayed.
> 
> Since new counters are added from time to time, fix it so that the
> ethtool logic will only display up to the maximum known counters.
> These 2 counters are not used by production firmware yet.
> 
> Fixes: 754fbf604ff6 ("bnxt_en: Update firmware interface to 1.10.2.171")

If this is a fix than the target should be "net" not "net-next".

> Reviewed-by: Ajit Khaparde <ajit.khaparde@...adcom.com>
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>
> ---
>  .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 28 +++++++++++++++----
>  1 file changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> index 53442aaabe5e..f3f384773ac0 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> @@ -535,6 +535,7 @@ static int bnxt_get_num_ring_stats(struct bnxt *bp)
>  static int bnxt_get_num_stats(struct bnxt *bp)
>  {
>  	int num_stats = bnxt_get_num_ring_stats(bp);
> +	int len;
>  
>  	num_stats += BNXT_NUM_RING_ERR_STATS;
>  
> @@ -542,8 +543,12 @@ static int bnxt_get_num_stats(struct bnxt *bp)
>  		num_stats += BNXT_NUM_PORT_STATS;
>  
>  	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
> -		num_stats += bp->fw_rx_stats_ext_size +
> -			     bp->fw_tx_stats_ext_size;
> +		len = min_t(int, bp->fw_rx_stats_ext_size,
> +			    ARRAY_SIZE(bnxt_port_stats_ext_arr));

You don't need "len" var.
Why not just:
	num_stats += min_t(int, bp->fw_rx_stats_ext_size,
			   ARRAY_SIZE(bnxt_port_stats_ext_arr));

> +		num_stats += len;
> +		len = min_t(int, bp->fw_tx_stats_ext_size,
> +			    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
> +		num_stats += len;
>  		if (bp->pri2cos_valid)
>  			num_stats += BNXT_NUM_STATS_PRI;
>  	}
> @@ -653,12 +658,17 @@ static void bnxt_get_ethtool_stats(struct net_device *dev,
>  	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
>  		u64 *rx_port_stats_ext = bp->rx_port_stats_ext.sw_stats;
>  		u64 *tx_port_stats_ext = bp->tx_port_stats_ext.sw_stats;
> +		u32 len;
>  
> -		for (i = 0; i < bp->fw_rx_stats_ext_size; i++, j++) {
> +		len = min_t(u32, bp->fw_rx_stats_ext_size,
> +			    ARRAY_SIZE(bnxt_port_stats_ext_arr));
> +		for (i = 0; i < len; i++, j++) {
>  			buf[j] = *(rx_port_stats_ext +
>  				   bnxt_port_stats_ext_arr[i].offset);
>  		}
> -		for (i = 0; i < bp->fw_tx_stats_ext_size; i++, j++) {
> +		len = min_t(u32, bp->fw_tx_stats_ext_size,
> +			    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
> +		for (i = 0; i < len; i++, j++) {
>  			buf[j] = *(tx_port_stats_ext +
>  				   bnxt_tx_port_stats_ext_arr[i].offset);
>  		}
> @@ -757,11 +767,17 @@ static void bnxt_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
>  			}
>  		}
>  		if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
> -			for (i = 0; i < bp->fw_rx_stats_ext_size; i++) {
> +			u32 len;
> +
> +			len = min_t(u32, bp->fw_rx_stats_ext_size,
> +				    ARRAY_SIZE(bnxt_port_stats_ext_arr));
> +			for (i = 0; i < len; i++) {
>  				strcpy(buf, bnxt_port_stats_ext_arr[i].string);
>  				buf += ETH_GSTRING_LEN;
>  			}
> -			for (i = 0; i < bp->fw_tx_stats_ext_size; i++) {
> +			len = min_t(u32, bp->fw_tx_stats_ext_size,
> +				    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
> +			for (i = 0; i < len; i++) {
>  				strcpy(buf,
>  				       bnxt_tx_port_stats_ext_arr[i].string);
>  				buf += ETH_GSTRING_LEN;