netdev - Re: [PATCH net-next 04/11] fjes: Add debugfs entry for statistics

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Date:	Mon, 11 Apr 2016 14:01:50 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Taku Izumi <izumi.taku@...fujitsu.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 04/11] fjes: Add debugfs entry for statistics

Mon, Apr 11, 2016 at 10:10:16AM CEST, izumi.taku@...fujitsu.com wrote:
>This patch introduces debugfs entry named "statistics"
>for statistics information.
>You can get net_stats information by reading
>/sys/kernel/debug/fjes/fjes.N/statistics file.
>This is useful for debugging.
>
>Signed-off-by: Taku Izumi <izumi.taku@...fujitsu.com>
>---
> drivers/net/fjes/fjes_debugfs.c | 72 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 72 insertions(+)
>
>diff --git a/drivers/net/fjes/fjes_debugfs.c b/drivers/net/fjes/fjes_debugfs.c
>index d2fd892..b0807c2 100644
>--- a/drivers/net/fjes/fjes_debugfs.c
>+++ b/drivers/net/fjes/fjes_debugfs.c
>@@ -31,6 +31,72 @@
> 
> static struct dentry *fjes_debug_root;
> 
>+static int fjes_dbg_stats_show(struct seq_file *m, void *v)
>+{
>+	struct fjes_adapter *adapter = m->private;
>+	struct fjes_hw *hw = &adapter->hw;
>+	int max_epid = hw->max_epid;
>+	int my_epid = hw->my_epid;
>+	int epidx;
>+
>+	seq_printf(m, "%41s", " ");
>+	for (epidx = 0; epidx < max_epid; epidx++)
>+		seq_printf(m, "%10s%d",
>+			   my_epid == epidx ? "(self)EP#" : "EP#", epidx);
>+	seq_printf(m, "\n");
>+
>+#define FJES_DEBUGFS_NET_STATS_ENTRY(X) do {				\
>+	seq_printf(m, "%-41s", #X);					\
>+	for (epidx = 0; epidx < max_epid; epidx++) {			\
>+		if (epidx == my_epid)					\
>+			seq_printf(m, "          -");			\
>+		else							\
>+			seq_printf(m, " %10llu",			\
>+				   hw->ep_shm_info[epidx].net_stats.X); \
>+	}								\
>+	seq_printf(m, "\n");						\
>+} while (0)
>+
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_packets);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_packets);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_bytes);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_bytes);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_dropped);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_dropped);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(multicast);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(collisions);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_length_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_over_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_crc_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_frame_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_fifo_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_missed_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_aborted_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_carrier_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_fifo_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_heartbeat_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_window_errors);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(rx_compressed);
>+	FJES_DEBUGFS_NET_STATS_ENTRY(tx_compressed);

This patch is certainly wrong. You should use existing well defined
stats API to expose this and not custom debufs blob.