scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 134 insertions, 0 deletions

diff --git a/fs/smb/server/proc.c b/fs/smb/server/proc.c
new file mode 100644
index 000000000..101a2cc45
--- /dev/null
+++ b/fs/smb/server/proc.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) 2025, LG Electronics.
+ *   Author(s): Hyunchul Lee <hyc.lee@gmail.com>
+ *   Copyright (C) 2025, Samsung Electronics.
+ *   Author(s): Vedansh Bhardwaj <v.bhardwaj@samsung.com>
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include "misc.h"
+#include "server.h"
+#include "stats.h"
+#include "smb_common.h"
+#include "smb2pdu.h"
+
+static struct proc_dir_entry *ksmbd_proc_fs;
+struct ksmbd_counters ksmbd_counters;
+
+struct proc_dir_entry *ksmbd_proc_create(const char *name,
+					 int (*show)(struct seq_file *m, void *v),
+						 void *v)
+{
+	return proc_create_single_data(name, 0400, ksmbd_proc_fs,
+			   show, v);
+}
+
+struct ksmbd_const_smb2_process_req {
+	unsigned int const_value;
+	const char *name;
+};
+
+static const struct ksmbd_const_smb2_process_req smb2_process_req[KSMBD_COUNTER_MAX_REQS] = {
+	{le16_to_cpu(SMB2_NEGOTIATE), "SMB2_NEGOTIATE"},
+	{le16_to_cpu(SMB2_SESSION_SETUP), "SMB2_SESSION_SETUP"},
+	{le16_to_cpu(SMB2_LOGOFF), "SMB2_LOGOFF"},
+	{le16_to_cpu(SMB2_TREE_CONNECT), "SMB2_TREE_CONNECT"},
+	{le16_to_cpu(SMB2_TREE_DISCONNECT), "SMB2_TREE_DISCONNECT"},
+	{le16_to_cpu(SMB2_CREATE), "SMB2_CREATE"},
+	{le16_to_cpu(SMB2_CLOSE), "SMB2_CLOSE"},
+	{le16_to_cpu(SMB2_FLUSH), "SMB2_FLUSH"},
+	{le16_to_cpu(SMB2_READ), "SMB2_READ"},
+	{le16_to_cpu(SMB2_WRITE), "SMB2_WRITE"},
+	{le16_to_cpu(SMB2_LOCK), "SMB2_LOCK"},
+	{le16_to_cpu(SMB2_IOCTL), "SMB2_IOCTL"},
+	{le16_to_cpu(SMB2_CANCEL), "SMB2_CANCEL"},
+	{le16_to_cpu(SMB2_ECHO), "SMB2_ECHO"},
+	{le16_to_cpu(SMB2_QUERY_DIRECTORY), "SMB2_QUERY_DIRECTORY"},
+	{le16_to_cpu(SMB2_CHANGE_NOTIFY), "SMB2_CHANGE_NOTIFY"},
+	{le16_to_cpu(SMB2_QUERY_INFO), "SMB2_QUERY_INFO"},
+	{le16_to_cpu(SMB2_SET_INFO), "SMB2_SET_INFO"},
+	{le16_to_cpu(SMB2_OPLOCK_BREAK), "SMB2_OPLOCK_BREAK"},
+};
+
+static int proc_show_ksmbd_stats(struct seq_file *m, void *v)
+{
+	int i;
+
+	seq_puts(m, "Server\n");
+	seq_printf(m, "name: %s\n", ksmbd_server_string());
+	seq_printf(m, "netbios: %s\n", ksmbd_netbios_name());
+	seq_printf(m, "work group: %s\n", ksmbd_work_group());
+	seq_printf(m, "min protocol: %s\n", ksmbd_get_protocol_string(server_conf.min_protocol));
+	seq_printf(m, "max protocol: %s\n", ksmbd_get_protocol_string(server_conf.max_protocol));
+	seq_printf(m, "flags: 0x%08x\n", server_conf.flags);
+	seq_printf(m, "share_fake_fscaps: 0x%08x\n",
+		   server_conf.share_fake_fscaps);
+	seq_printf(m, "sessions: %lld\n",
+		   ksmbd_counter_sum(KSMBD_COUNTER_SESSIONS));
+	seq_printf(m, "tree connects: %lld\n",
+		   ksmbd_counter_sum(KSMBD_COUNTER_TREE_CONNS));
+	seq_printf(m, "read bytes: %lld\n",
+		   ksmbd_counter_sum(KSMBD_COUNTER_READ_BYTES));
+	seq_printf(m, "written bytes: %lld\n",
+		   ksmbd_counter_sum(KSMBD_COUNTER_WRITE_BYTES));
+
+	seq_puts(m, "\nSMB2\n");
+	for (i = 0; i < KSMBD_COUNTER_MAX_REQS; i++)
+		seq_printf(m, "%-20s:\t%lld\n", smb2_process_req[i].name,
+			   ksmbd_counter_sum(KSMBD_COUNTER_FIRST_REQ + i));
+	return 0;
+}
+
+void ksmbd_proc_cleanup(void)
+{
+	int i;
+
+	if (!ksmbd_proc_fs)
+		return;
+
+	proc_remove(ksmbd_proc_fs);
+
+	for (i = 0; i < ARRAY_SIZE(ksmbd_counters.counters); i++)
+		percpu_counter_destroy(&ksmbd_counters.counters[i]);
+
+	ksmbd_proc_fs = NULL;
+}
+
+void ksmbd_proc_reset(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ksmbd_counters.counters); i++)
+		percpu_counter_set(&ksmbd_counters.counters[i], 0);
+}
+
+void ksmbd_proc_init(void)
+{
+	int i;
+	int retval;
+
+	ksmbd_proc_fs = proc_mkdir("fs/ksmbd", NULL);
+	if (!ksmbd_proc_fs)
+		return;
+
+	if (!proc_mkdir_mode("sessions", 0400, ksmbd_proc_fs))
+		goto err_out;
+
+	for (i = 0; i < ARRAY_SIZE(ksmbd_counters.counters); i++) {
+		retval = percpu_counter_init(&ksmbd_counters.counters[i], 0, GFP_KERNEL);
+		if (retval)
+			goto err_out;
+	}
+
+	if (!ksmbd_proc_create("server", proc_show_ksmbd_stats, NULL))
+		goto err_out;
+
+	ksmbd_proc_reset();
+	return;
+err_out:
+	ksmbd_proc_cleanup();
+}