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, 152 insertions, 0 deletions

diff --git a/io_uring/query.c b/io_uring/query.c
new file mode 100644
index 000000000..d529d94aa
--- /dev/null
+++ b/io_uring/query.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "linux/io_uring/query.h"
+
+#include "query.h"
+#include "io_uring.h"
+#include "zcrx.h"
+
+union io_query_data {
+	struct io_uring_query_opcode opcodes;
+	struct io_uring_query_zcrx zcrx;
+	struct io_uring_query_zcrx_notif zcrx_notif;
+	struct io_uring_query_scq scq;
+};
+
+#define IO_MAX_QUERY_SIZE		sizeof(union io_query_data)
+#define IO_MAX_QUERY_ENTRIES		1000
+
+static ssize_t io_query_ops(union io_query_data *data)
+{
+	struct io_uring_query_opcode *e = &data->opcodes;
+
+	e->nr_request_opcodes = IORING_OP_LAST;
+	e->nr_register_opcodes = IORING_REGISTER_LAST;
+	e->feature_flags = IORING_FEAT_FLAGS;
+	e->ring_setup_flags = IORING_SETUP_FLAGS;
+	e->enter_flags = IORING_ENTER_FLAGS;
+	e->sqe_flags = SQE_VALID_FLAGS;
+	e->nr_query_opcodes = __IO_URING_QUERY_MAX;
+	e->__pad = 0;
+	return sizeof(*e);
+}
+
+static ssize_t io_query_zcrx(union io_query_data *data)
+{
+	struct io_uring_query_zcrx *e = &data->zcrx;
+
+	e->register_flags = ZCRX_SUPPORTED_REG_FLAGS;
+	e->area_flags = IORING_ZCRX_AREA_DMABUF;
+	e->nr_ctrl_opcodes = __ZCRX_CTRL_LAST;
+	e->rq_hdr_size = sizeof(struct io_uring);
+	e->rq_hdr_alignment = L1_CACHE_BYTES;
+	e->features = ZCRX_FEATURES;
+	e->__resv2 = 0;
+	return sizeof(*e);
+}
+
+static ssize_t io_query_zcrx_notif(union io_query_data *data)
+{
+	struct io_uring_query_zcrx_notif *e = &data->zcrx_notif;
+
+	e->notif_flags = ZCRX_NOTIF_TYPE_MASK;
+	e->notif_stats_size = sizeof(struct zcrx_notif_stats);
+	e->notif_stats_off_alignment = __alignof__(struct zcrx_notif_stats);
+	e->__resv1 = 0;
+	memset(&e->__resv2, 0, sizeof(e->__resv2));
+	return sizeof(*e);
+}
+
+static ssize_t io_query_scq(union io_query_data *data)
+{
+	struct io_uring_query_scq *e = &data->scq;
+
+	e->hdr_size = sizeof(struct io_rings);
+	e->hdr_alignment = SMP_CACHE_BYTES;
+	return sizeof(*e);
+}
+
+static int io_handle_query_entry(union io_query_data *data, void __user *uhdr,
+				 u64 *next_entry)
+{
+	struct io_uring_query_hdr hdr;
+	size_t usize, res_size = 0;
+	ssize_t ret = -EINVAL;
+	void __user *udata;
+
+	if (copy_from_user(&hdr, uhdr, sizeof(hdr)))
+		return -EFAULT;
+	usize = hdr.size;
+	hdr.size = min(hdr.size, IO_MAX_QUERY_SIZE);
+	udata = u64_to_user_ptr(hdr.query_data);
+
+	if (hdr.query_op >= __IO_URING_QUERY_MAX) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+	if (!mem_is_zero(hdr.__resv, sizeof(hdr.__resv)) || hdr.result || !hdr.size)
+		goto out;
+	if (copy_from_user(data, udata, hdr.size))
+		return -EFAULT;
+
+	switch (hdr.query_op) {
+	case IO_URING_QUERY_OPCODES:
+		ret = io_query_ops(data);
+		break;
+	case IO_URING_QUERY_ZCRX:
+		ret = io_query_zcrx(data);
+		break;
+	case IO_URING_QUERY_ZCRX_NOTIF:
+		ret = io_query_zcrx_notif(data);
+		break;
+	case IO_URING_QUERY_SCQ:
+		ret = io_query_scq(data);
+		break;
+	}
+
+	if (ret >= 0) {
+		if (WARN_ON_ONCE(ret > IO_MAX_QUERY_SIZE))
+			return -EFAULT;
+		res_size = ret;
+		ret = 0;
+	}
+out:
+	hdr.result = ret;
+	hdr.size = min_t(size_t, usize, res_size);
+
+	if (copy_struct_to_user(udata, usize, data, hdr.size, NULL))
+		return -EFAULT;
+	if (copy_to_user(uhdr, &hdr, sizeof(hdr)))
+		return -EFAULT;
+	*next_entry = hdr.next_entry;
+	return 0;
+}
+
+int io_query(void __user *arg, unsigned nr_args)
+{
+	union io_query_data entry_buffer;
+	void __user *uhdr = arg;
+	int ret, nr = 0;
+
+	memset(&entry_buffer, 0, sizeof(entry_buffer));
+
+	if (nr_args)
+		return -EINVAL;
+
+	while (uhdr) {
+		u64 next_hdr;
+
+		ret = io_handle_query_entry(&entry_buffer, uhdr, &next_hdr);
+		if (ret)
+			return ret;
+		uhdr = u64_to_user_ptr(next_hdr);
+
+		/* Have some limit to avoid a potential cycle */
+		if (++nr >= IO_MAX_QUERY_ENTRIES)
+			return -ERANGE;
+		if (fatal_signal_pending(current))
+			return -EINTR;
+		cond_resched();
+	}
+	return 0;
+}