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Fri, 20 Mar 2026 01:42:14 -0700 (PDT) Received: from 7940hx ([103.173.155.241]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c743a7ff47csm1288665a12.6.2026.03.20.01.42.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Mar 2026 01:42:14 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next] selftests/bpf: test access to ringbuf position with map pointer Date: Fri, 20 Mar 2026 16:41:55 +0800 Message-ID: <20260320084155.288417-1-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the testing to access the bpf_ringbuf with the map pointer. "consumer_pos" and "producer_pos" is accessed in this testing. We reserve 128 bytes in the ringbuf to test the producer_pos, which should be "128 + 8", and the "8" is BPF_RINGBUF_HDR_SZ. It will be helpful if we want to evaluate the usage of the ringbuf in bpf prog with the consumer and producer position. Signed-off-by: Menglong Dong Reviewed-by: Emil Tsalapatis --- .../testing/selftests/bpf/progs/map_ptr_kern.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/map_ptr_kern.c b/tools/testi= ng/selftests/bpf/progs/map_ptr_kern.c index efaf622c28dd..c3fa57ec430b 100644 --- a/tools/testing/selftests/bpf/progs/map_ptr_kern.c +++ b/tools/testing/selftests/bpf/progs/map_ptr_kern.c @@ -647,21 +647,39 @@ static inline int check_devmap_hash(void) return 1; } =20 +struct bpf_ringbuf { + unsigned long consumer_pos; + unsigned long producer_pos; +} __attribute__((preserve_access_index)); + struct bpf_ringbuf_map { struct bpf_map map; + struct bpf_ringbuf *rb; } __attribute__((preserve_access_index)); =20 struct { __uint(type, BPF_MAP_TYPE_RINGBUF); + __uint(max_entries, 1 << 10); } m_ringbuf SEC(".maps"); =20 static inline int check_ringbuf(void) { struct bpf_ringbuf_map *ringbuf =3D (struct bpf_ringbuf_map *)&m_ringbuf; struct bpf_map *map =3D (struct bpf_map *)&m_ringbuf; + struct bpf_ringbuf *rb; + void *ptr; =20 VERIFY(check(&ringbuf->map, map, 0, 0, page_size)); =20 + ptr =3D bpf_ringbuf_reserve(&m_ringbuf, 128, 0); + VERIFY(ptr); + + bpf_ringbuf_discard(ptr, 0); + rb =3D ringbuf->rb; + VERIFY(rb); + VERIFY(rb->consumer_pos =3D=3D 0); + VERIFY(rb->producer_pos =3D=3D 128 + 8); + return 1; } =20 --=20 2.53.0