linux-kernel - Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool statistics

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Date:   Thu, 10 Nov 2022 12:54:13 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Shenwei Wang <shenwei.wang@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        imx@...ts.linux.dev
Subject: Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool statistics

Hello,

On Tue, 2022-11-08 at 20:31 -0600, Shenwei Wang wrote:
> @@ -2685,9 +2738,16 @@ static void fec_enet_get_strings(struct net_device *netdev,
>  	int i;
>  	switch (stringset) {
>  	case ETH_SS_STATS:
> -		for (i = 0; i < ARRAY_SIZE(fec_stats); i++)
> -			memcpy(data + i * ETH_GSTRING_LEN,
> -				fec_stats[i].name, ETH_GSTRING_LEN);
> +		for (i = 0; i < ARRAY_SIZE(fec_stats); i++) {
> +			memcpy(data, fec_stats[i].name, ETH_GSTRING_LEN);
> +			data += ETH_GSTRING_LEN;
> +		}
> +		for (i = 0; i < ARRAY_SIZE(fec_xdp_stat_strs); i++) {
> +			memcpy(data, fec_xdp_stat_strs[i], ETH_GSTRING_LEN);
> +			data += ETH_GSTRING_LEN;

The above triggers a warning:

In function ‘fortify_memcpy_chk’,
    inlined from ‘fec_enet_get_strings’ at ../drivers/net/ethernet/freescale/fec_main.c:2788:4:
../include/linux/fortify-string.h:413:25: warning: call to ‘__read_overflow2_field’ declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Wattribute-warning]
  413 |                         __read_overflow2_field(q_size_field, size);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I think you can address it changing fec_xdp_stat_strs definition to:

static const char fec_xdp_stat_strs[XDP_STATS_TOTAL][ETH_GSTRING_LEN] = { // ...

Cheers,

Paolo