linux-kernel - Re: [PATCH net-next v3 13/14] net: ethernet: qualcomm: Add PPE debugfs support for PPE counters

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Message-ID: <5a53333b-e94c-4fb7-b23d-e1d38d2dad8e@lunn.ch>
Date: Tue, 11 Feb 2025 14:55:16 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Luo Jie <quic_luoj@...cinc.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Lei Wei <quic_leiwei@...cinc.com>,
	Suruchi Agarwal <quic_suruchia@...cinc.com>,
	Pavithra R <quic_pavir@...cinc.com>,
	Simon Horman <horms@...nel.org>, Jonathan Corbet <corbet@....net>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org,
	quic_kkumarcs@...cinc.com, quic_linchen@...cinc.com,
	srinivas.kandagatla@...aro.org, bartosz.golaszewski@...aro.org,
	john@...ozen.org
Subject: Re: [PATCH net-next v3 13/14] net: ethernet: qualcomm: Add PPE
 debugfs support for PPE counters

> +#define PRINT_COUNTER_PREFIX(desc, cnt_type)		\
> +	seq_printf(seq, "%-16s %16s", desc, cnt_type)
> +
> +#define PRINT_CPU_CODE_COUNTER(cnt, code)		\
> +	seq_printf(seq, "%10u(cpucode:%d)", cnt, code)
> +
> +#define PRINT_DROP_CODE_COUNTER(cnt, port, code)	\
> +	seq_printf(seq, "%10u(port=%d),dropcode:%d", cnt, port, code)
> +
> +#define PRINT_SINGLE_COUNTER(tag, cnt, str, index)			\
> +do {									\
> +	if (!((tag) % 4))							\
> +		seq_printf(seq, "\n%-16s %16s", "", "");		\
> +	seq_printf(seq, "%10u(%s=%04d)", cnt, str, index);		\
> +} while (0)
> +
> +#define PRINT_TWO_COUNTERS(tag, cnt0, cnt1, str, index)			\
> +do {									\
> +	if (!((tag) % 4))							\
> +		seq_printf(seq, "\n%-16s %16s", "", "");		\
> +	seq_printf(seq, "%10u/%u(%s=%04d)", cnt0, cnt1, str, index);	\
> +} while (0)

I don't think these make the code any more readable. Just inline it.

> +/* The number of packets dropped because of no buffer available, no PPE
> + * buffer assigned to these packets.
> + */
> +static void ppe_port_rx_drop_counter_get(struct ppe_device *ppe_dev,
> +					 struct seq_file *seq)
> +{
> +	u32 reg, drop_cnt = 0;
> +	int ret, i, tag = 0;
> +
> +	PRINT_COUNTER_PREFIX("PRX_DROP_CNT", "SILENT_DROP:");
> +	for (i = 0; i < PPE_DROP_CNT_TBL_ENTRIES; i++) {
> +		reg = PPE_DROP_CNT_TBL_ADDR + i * PPE_DROP_CNT_TBL_INC;
> +		ret = ppe_pkt_cnt_get(ppe_dev, reg, PPE_PKT_CNT_SIZE_1WORD,
> +				      &drop_cnt, NULL);
> +		if (ret) {
> +			seq_printf(seq, "ERROR %d\n", ret);
> +			return;
> +		}

This is an error getting the value from the hardware? You should not
put that into the debugfs itself, you want the read() call to return
it.

> +/* Display the various packet counters of PPE. */
> +static int ppe_packet_counter_show(struct seq_file *seq, void *v)
> +{
> +	struct ppe_device *ppe_dev = seq->private;
> +
> +	ppe_port_rx_drop_counter_get(ppe_dev, seq);
> +	ppe_port_rx_bm_drop_counter_get(ppe_dev, seq);
> +	ppe_port_rx_bm_port_counter_get(ppe_dev, seq);
> +	ppe_parse_pkt_counter_get(ppe_dev, seq);
> +	ppe_port_rx_counter_get(ppe_dev, seq);
> +	ppe_vp_rx_counter_get(ppe_dev, seq);
> +	ppe_pre_l2_counter_get(ppe_dev, seq);
> +	ppe_vlan_counter_get(ppe_dev, seq);
> +	ppe_cpu_code_counter_get(ppe_dev, seq);
> +	ppe_eg_vsi_counter_get(ppe_dev, seq);
> +	ppe_vp_tx_counter_get(ppe_dev, seq);
> +	ppe_port_tx_counter_get(ppe_dev, seq);
> +	ppe_queue_tx_counter_get(ppe_dev, seq);

It would be more normal to have one debugfs file per group of
counters.

	Andrew