netdev - Re: [PATCH net-next 16/17] net: atlantic: MACSec offload statistics implementation

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Date:   Mon, 23 Mar 2020 22:14:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Igor Russkikh <irusskikh@...vell.com>, netdev@...r.kernel.org
Cc:     Mark Starovoytov <mstarovoitov@...vell.com>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Dmitry Bogdanov <dbogdanov@...vell.com>
Subject: Re: [PATCH net-next 16/17] net: atlantic: MACSec offload statistics
 implementation

On Mon, 2020-03-23 at 16:13 +0300, Igor Russkikh wrote:
> From: Dmitry Bogdanov <dbogdanov@...vell.com>
> 
> This patch adds support for MACSec statistics on Atlantic network cards.

trivia:

> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c b/drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c
[]
> @@ -96,6 +97,62 @@ static const char aq_ethtool_queue_stat_names[][ETH_GSTRING_LEN] = {
>  	"Queue[%d] InErrors",
>  };
[]
> +static const char aq_macsec_txsc_stat_names[][ETH_GSTRING_LEN + 1] = {
> +	"MACSecTXSC%d ProtectedPkts\0",
> +	"MACSecTXSC%d EncryptedPkts\0",
> +	"MACSecTXSC%d ProtectedOctets\0",
> +	"MACSecTXSC%d EncryptedOctets\0",
> +};
> +
> +static const char aq_macsec_txsa_stat_names[][ETH_GSTRING_LEN + 1] = {
> +	"MACSecTXSC%dSA%d HitDropRedirect\0",
> +	"MACSecTXSC%dSA%d Protected2Pkts\0",
> +	"MACSecTXSC%dSA%d ProtectedPkts\0",
> +	"MACSecTXSC%dSA%d EncryptedPkts\0",
> +};
> +
> +static const char aq_macsec_rxsa_stat_names[][ETH_GSTRING_LEN + 1] = {
> +	"MACSecRXSC%dSA%d UntaggedHitPkts\0",
> +	"MACSecRXSC%dSA%d CtrlHitDrpRedir\0",
> +	"MACSecRXSC%dSA%d NotUsingSa\0",
> +	"MACSecRXSC%dSA%d UnusedSa\0",
> +	"MACSecRXSC%dSA%d NotValidPkts\0",
> +	"MACSecRXSC%dSA%d InvalidPkts\0",
> +	"MACSecRXSC%dSA%d OkPkts\0",
> +	"MACSecRXSC%dSA%d LatePkts\0",
> +	"MACSecRXSC%dSA%d DelayedPkts\0",
> +	"MACSecRXSC%dSA%d UncheckedPkts\0",
> +	"MACSecRXSC%dSA%d ValidatedOctets\0",
> +	"MACSecRXSC%dSA%d DecryptedOctets\0",
> +};

The terminating \0 is odd and aren't these used only
for format strings?

If so, why are these [][ETH_GSTRING_LEN + 1] and not
static const char * [] ?

[]

> +#if IS_ENABLED(CONFIG_MACSEC)
> +		if (!aq_nic->macsec_cfg)
> +			break;
> +
> +		memcpy(p, aq_macsec_stat_names, sizeof(aq_macsec_stat_names));
> +		p = p + sizeof(aq_macsec_stat_names);
> +		for (i = 0; i < AQ_MACSEC_MAX_SC; i++) {
> +			struct aq_macsec_txsc *aq_txsc;
> +
> +			if (!(test_bit(i, &aq_nic->macsec_cfg->txsc_idx_busy)))
> +				continue;
> +
> +			for (si = 0;
> +				si < ARRAY_SIZE(aq_macsec_txsc_stat_names);
> +				si++) {
> +				snprintf(p, ETH_GSTRING_LEN,
> +					 aq_macsec_txsc_stat_names[si], i);

Used as format string, etc...

> +				p += ETH_GSTRING_LEN;
> +			}
> +			aq_txsc = &aq_nic->macsec_cfg->aq_txsc[i];
> +			for (sa = 0; sa < MACSEC_NUM_AN; sa++) {
> +				if (!(test_bit(sa, &aq_txsc->tx_sa_idx_busy)))
> +					continue;
> +				for (si = 0;
> +				     si < ARRAY_SIZE(aq_macsec_txsa_stat_names);
> +				     si++) {
> +					snprintf(p, ETH_GSTRING_LEN,
> +						 aq_macsec_txsa_stat_names[si],
> +						 i, sa);
> +					p += ETH_GSTRING_LEN;
> +				}
> +			}
> +		}
> +		for (i = 0; i < AQ_MACSEC_MAX_SC; i++) {
> +			struct aq_macsec_rxsc *aq_rxsc;
> +
> +			if (!(test_bit(i, &aq_nic->macsec_cfg->rxsc_idx_busy)))
> +				continue;
> +
> +			aq_rxsc = &aq_nic->macsec_cfg->aq_rxsc[i];
> +			for (sa = 0; sa < MACSEC_NUM_AN; sa++) {
> +				if (!(test_bit(sa, &aq_rxsc->rx_sa_idx_busy)))
> +					continue;
> +				for (si = 0;
> +				     si < ARRAY_SIZE(aq_macsec_rxsa_stat_names);
> +				     si++) {
> +					snprintf(p, ETH_GSTRING_LEN,
> +						 aq_macsec_rxsa_stat_names[si],
> +						 i, sa);
> +					p += ETH_GSTRING_LEN;
> +				}
> +			}
> +		}
> +#endif

etc...