netdev - [PATCH v2 net-next 1/2] net-sysfs: display two backlog queue len separately

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Message-Id: <20230314030532.9238-2-kerneljasonxing@gmail.com>
Date:   Tue, 14 Mar 2023 11:05:31 +0800
From:   Jason Xing <kerneljasonxing@...il.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com,
        stephen@...workplumber.org, simon.horman@...igine.com,
        sinquersw@...il.com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kerneljasonxing@...il.com,
        Jason Xing <kernelxing@...cent.com>
Subject: [PATCH v2 net-next 1/2] net-sysfs: display two backlog queue len separately

From: Jason Xing <kernelxing@...cent.com>

Sometimes we need to know which one of backlog queue can be exactly
long enough to cause some latency when debugging this part is needed.
Thus, we can then separate the display of both.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
v2: keep the total len of backlog queues untouched as Eric said
Link: https://lore.kernel.org/lkml/20230311151756.83302-1-kerneljasonxing@gmail.com/
---
 net/core/net-procfs.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index 1ec23bf8b05c..2809b663e78d 100644
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -115,10 +115,19 @@ static int dev_seq_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
+static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
+{
+	return skb_queue_len_lockless(&sd->input_pkt_queue);
+}
+
+static u32 softnet_process_queue_len(struct softnet_data *sd)
+{
+	return skb_queue_len_lockless(&sd->process_queue);
+}
+
 static u32 softnet_backlog_len(struct softnet_data *sd)
 {
-	return skb_queue_len_lockless(&sd->input_pkt_queue) +
-	       skb_queue_len_lockless(&sd->process_queue);
+	return softnet_input_pkt_queue_len(sd) + softnet_process_queue_len(sd);
 }
 
 static struct softnet_data *softnet_get_online(loff_t *pos)
@@ -169,12 +178,15 @@ static int softnet_seq_show(struct seq_file *seq, void *v)
 	 * mapping the data a specific CPU
 	 */
 	seq_printf(seq,
-		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
+		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
+		   "%08x %08x\n",
 		   sd->processed, sd->dropped, sd->time_squeeze, 0,
 		   0, 0, 0, 0, /* was fastroute */
 		   0,	/* was cpu_collision */
 		   sd->received_rps, flow_limit_count,
-		   softnet_backlog_len(sd), (int)seq->index);
+		   softnet_backlog_len(sd),	/* keep it untouched */
+		   (int)seq->index,
+		   softnet_input_pkt_queue_len(sd), softnet_process_queue_len(sd));
 	return 0;
 }
 
-- 
2.37.3