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, 128 insertions, 0 deletions

diff --git a/samples/hid/hid_mouse.bpf.c b/samples/hid/hid_mouse.bpf.c
new file mode 100644
index 000000000..f7f722dcf
--- /dev/null
+++ b/samples/hid/hid_mouse.bpf.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include "hid_bpf_helpers.h"
+
+static int hid_y_event(struct hid_bpf_ctx *hctx)
+{
+	s16 y;
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	bpf_printk("event: size: %d", hctx->size);
+	bpf_printk("incoming event: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("                %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("                %02x %02x %02x",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	y = data[3] | (data[4] << 8);
+
+	y = -y;
+
+	data[3] = y & 0xFF;
+	data[4] = (y >> 8) & 0xFF;
+
+	bpf_printk("modified event: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("                %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("                %02x %02x %02x",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	return 0;
+}
+
+static int hid_x_event(struct hid_bpf_ctx *hctx)
+{
+	s16 x;
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 9 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	x = data[1] | (data[2] << 8);
+
+	x = -x;
+
+	data[1] = x & 0xFF;
+	data[2] = (x >> 8) & 0xFF;
+	return 0;
+}
+
+SEC("struct_ops/hid_device_event")
+int BPF_PROG(hid_event, struct hid_bpf_ctx *hctx, enum hid_report_type type)
+{
+	int ret = hid_y_event(hctx);
+
+	if (ret)
+		return ret;
+
+	return hid_x_event(hctx);
+}
+
+
+SEC("struct_ops/hid_rdesc_fixup")
+int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0 /* offset */, 4096 /* size */);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	bpf_printk("rdesc: %02x %02x %02x",
+		   data[0],
+		   data[1],
+		   data[2]);
+	bpf_printk("       %02x %02x %02x",
+		   data[3],
+		   data[4],
+		   data[5]);
+	bpf_printk("       %02x %02x %02x ...",
+		   data[6],
+		   data[7],
+		   data[8]);
+
+	/*
+	 * The original report descriptor contains:
+	 *
+	 * 0x05, 0x01,                    //   Usage Page (Generic Desktop)      30
+	 * 0x16, 0x01, 0x80,              //   Logical Minimum (-32767)          32
+	 * 0x26, 0xff, 0x7f,              //   Logical Maximum (32767)           35
+	 * 0x09, 0x30,                    //   Usage (X)                         38
+	 * 0x09, 0x31,                    //   Usage (Y)                         40
+	 *
+	 * So byte 39 contains Usage X and byte 41 Usage Y.
+	 *
+	 * We simply swap the axes here.
+	 */
+	data[39] = 0x31;
+	data[41] = 0x30;
+
+	return 0;
+}
+
+SEC(".struct_ops.link")
+struct hid_bpf_ops mouse_invert = {
+	.hid_rdesc_fixup = (void *)hid_rdesc_fixup,
+	.hid_device_event = (void *)hid_event,
+};
+
+char _license[] SEC("license") = "GPL";