[RFC PATCH bpf-next 6/6] selftests/bpf: Add XDP load-balancer benchmark run script

[Puranjay Mohan <puranjay@kernel.org>]

Add a convenience script that runs all 24 XDP load-balancer scenarios
and formats the results as a table with median, stddev, CV, and
percentile columns.

  ./benchs/run_bench_xdp_lb.sh

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
 .../selftests/bpf/benchs/run_bench_xdp_lb.sh  | 84 +++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_xdp_lb.sh

diff --git a/tools/testing/selftests/bpf/benchs/run_bench_xdp_lb.sh b/tools/testing/selftests/bpf/benchs/run_bench_xdp_lb.sh
new file mode 100755
index 000000000000..1bde3898dfb6
--- /dev/null
+++ b/tools/testing/selftests/bpf/benchs/run_bench_xdp_lb.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+source ./benchs/run_common.sh
+
+set -eufo pipefail
+
+WARMUP=${WARMUP:-3}
+
+RUN="sudo ./bench -q -w${WARMUP} -a xdp-lb --machine-readable"
+
+SEP="  +----------------------------------+------+----------+---------+--------+----------+----------+----------+----------+"
+HDR="  | %-32s | %4s | %8s | %7s | %6s | %8s | %8s | %8s | %8s |\n"
+ROW="  | %-32s | %4s | %8s | %7s | %6s | %8s | %8s | %8s | %8s |\n"
+
+function group_header()
+{
+	printf "%s\n" "$SEP"
+	printf "$HDR" "$1" "n" "p50" "stddev" "CV" "min" "p90" "p99" "max"
+	printf "%s\n" "$SEP"
+}
+
+function rval()
+{
+	echo "$1" | sed -nE "s/.*$2=([^ ]+).*/\1/p"
+}
+
+function run_scenario()
+{
+	local sc="$1"
+	shift
+	local output rline
+
+	output=$($RUN --scenario "$sc" "$@" 2>&1)
+	rline=$(echo "$output" | grep '^RESULT ' || true)
+
+	if [ -z "$rline" ]; then
+		printf "$ROW" "$sc" "ERR" "-" "-" "-" "-" "-" "-" "-"
+		return
+	fi
+
+	printf "$ROW" "$sc" \
+		"$(rval "$rline" samples)" \
+		"$(rval "$rline" median)" \
+		"$(rval "$rline" stddev)" \
+		"$(rval "$rline" cv)%" \
+		"$(rval "$rline" min)" \
+		"$(rval "$rline" p90)" \
+		"$(rval "$rline" p99)" \
+		"$(rval "$rline" max)"
+}
+
+header "XDP load-balancer benchmark"
+
+group_header "Single-flow baseline"
+for sc in tcp-v4-lru-hit tcp-v4-ch \
+	  tcp-v6-lru-hit tcp-v6-ch \
+	  udp-v4-lru-hit udp-v6-lru-hit \
+	  tcp-v4v6-lru-hit; do
+	run_scenario "$sc"
+done
+
+group_header "Diverse flows (4K src addrs)"
+for sc in tcp-v4-lru-diverse tcp-v4-ch-diverse \
+	  tcp-v6-lru-diverse tcp-v6-ch-diverse \
+	  udp-v4-lru-diverse; do
+	run_scenario "$sc"
+done
+
+group_header "TCP flags"
+run_scenario tcp-v4-syn
+run_scenario tcp-v4-rst-miss
+
+group_header "LRU stress"
+run_scenario tcp-v4-lru-miss
+run_scenario udp-v4-lru-miss
+run_scenario tcp-v4-lru-warmup
+
+group_header "Early exits"
+for sc in pass-v4-no-vip pass-v6-no-vip pass-v4-icmp pass-non-ip \
+	  drop-v4-frag drop-v4-options drop-v6-frag; do
+	run_scenario "$sc"
+done
+printf "%s\n" "$SEP"
-- 
2.52.0