netdev - [PATCH bpf-next v3 6/7] samples: bpf: fix lwt_len

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Message-Id: <20201124090310.24374-7-danieltimlee@gmail.com>
Date:   Tue, 24 Nov 2020 09:03:09 +0000
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>, brakmo <brakmo@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Yonghong Song <yhs@...com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Ira Weiny <ira.weiny@...el.com>, Thomas Graf <tgraf@...g.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        John Fastabend <john.fastabend@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Xdp <xdp-newbies@...r.kernel.org>
Subject: [PATCH bpf-next v3 6/7] samples: bpf: fix lwt_len_hist reusing previous BPF map

Currently, lwt_len_hist's map lwt_len_hist_map is uses pinning, and the
map isn't cleared on test end. This leds to reuse of that map for
each test, which prevents the results of the test from being accurate.

This commit fixes the problem by removing of pinned map from bpffs.
Also, this commit add the executable permission to shell script
files.

Fixes: f74599f7c5309 ("bpf: Add tests and samples for LWT-BPF")
Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
---
 samples/bpf/lwt_len_hist.sh | 2 ++
 samples/bpf/test_lwt_bpf.sh | 0
 2 files changed, 2 insertions(+)
 mode change 100644 => 100755 samples/bpf/lwt_len_hist.sh
 mode change 100644 => 100755 samples/bpf/test_lwt_bpf.sh

diff --git a/samples/bpf/lwt_len_hist.sh b/samples/bpf/lwt_len_hist.sh
old mode 100644
new mode 100755
index 090b96eaf7f7..0eda9754f50b
--- a/samples/bpf/lwt_len_hist.sh
+++ b/samples/bpf/lwt_len_hist.sh
@@ -8,6 +8,8 @@ VETH1=tst_lwt1b
 TRACE_ROOT=/sys/kernel/debug/tracing
 
 function cleanup {
+	# To reset saved histogram, remove pinned map
+	rm /sys/fs/bpf/tc/globals/lwt_len_hist_map
 	ip route del 192.168.253.2/32 dev $VETH0 2> /dev/null
 	ip link del $VETH0 2> /dev/null
 	ip link del $VETH1 2> /dev/null
diff --git a/samples/bpf/test_lwt_bpf.sh b/samples/bpf/test_lwt_bpf.sh
old mode 100644
new mode 100755
-- 
2.25.1