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Date: Thu, 28 May 2020 00:08:34 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: David Ahern <dsahern@...nel.org>
Cc: Networking <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Daniel Borkmann <daniel@...earbox.net>,
john fastabend <john.fastabend@...il.com>,
Alexei Starovoitov <ast@...nel.org>, Martin Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Andrii Nakryiko <andriin@...com>,
David Ahern <dsahern@...il.com>
Subject: Re: [PATCH v2 bpf-next 5/5] selftest: Add tests for XDP programs in
devmap entries
On Wed, May 27, 2020 at 5:15 PM David Ahern <dsahern@...nel.org> wrote:
>
> Add tests to verify ability to add an XDP program to a
> entry in a DEVMAP.
>
> Add negative tests to show DEVMAP programs can not be
> attached to devices as a normal XDP program, and accesses
> to egress_ifindex require BPF_XDP_DEVMAP attach type.
>
> Signed-off-by: David Ahern <dsahern@...nel.org>
> ---
> .../bpf/prog_tests/xdp_devmap_attach.c | 94 +++++++++++++++++++
> .../selftests/bpf/progs/test_xdp_devmap.c | 19 ++++
> .../selftests/bpf/progs/test_xdp_devmap2.c | 19 ++++
> .../bpf/progs/test_xdp_with_devmap.c | 17 ++++
> 4 files changed, 149 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_devmap.c
> create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_devmap2.c
> create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_with_devmap.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> new file mode 100644
> index 000000000000..d81b2b366f39
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
> @@ -0,0 +1,94 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <uapi/linux/bpf.h>
> +#include <linux/if_link.h>
> +#include <test_progs.h>
> +
> +#define IFINDEX_LO 1
> +
> +void test_xdp_devmap_attach(void)
> +{
> + struct bpf_prog_load_attr attr = {
> + .prog_type = BPF_PROG_TYPE_XDP,
> + };
> + struct bpf_object *obj, *dm_obj = NULL;
> + int err, dm_fd = -1, fd = -1, map_fd;
> + struct bpf_prog_info info = {};
> + struct devmap_val val = {
> + .ifindex = IFINDEX_LO,
> + };
> + __u32 id, len = sizeof(info);
> + __u32 duration = 0, idx = 0;
> +
> + attr.file = "./test_xdp_with_devmap.o",
> + err = bpf_prog_load_xattr(&attr, &obj, &fd);
please use skeletons instead of loading .o files.
> + if (CHECK(err, "load of xdp program with 8-byte devmap",
> + "err %d errno %d\n", err, errno))
> + return;
> +
[...]
> diff --git a/tools/testing/selftests/bpf/progs/test_xdp_devmap.c b/tools/testing/selftests/bpf/progs/test_xdp_devmap.c
> new file mode 100644
> index 000000000000..64fc2c3cae01
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_xdp_devmap.c
> @@ -0,0 +1,19 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* program inserted into devmap entry */
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +SEC("xdp_devmap_log")
> +int xdpdm_devlog(struct xdp_md *ctx)
> +{
> + char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
> + void *data_end = (void *)(long)ctx->data_end;
> + void *data = (void *)(long)ctx->data;
> + unsigned int len = data_end - data;
> +
> + bpf_trace_printk(fmt, sizeof(fmt), ctx->ingress_ifindex, ctx->egress_ifindex, len);
> +
> + return XDP_PASS;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> diff --git a/tools/testing/selftests/bpf/progs/test_xdp_devmap2.c b/tools/testing/selftests/bpf/progs/test_xdp_devmap2.c
> new file mode 100644
> index 000000000000..64fc2c3cae01
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_xdp_devmap2.c
> @@ -0,0 +1,19 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* program inserted into devmap entry */
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +SEC("xdp_devmap_log")
> +int xdpdm_devlog(struct xdp_md *ctx)
> +{
> + char fmt[] = "devmap redirect: dev %u -> dev %u len %u\n";
> + void *data_end = (void *)(long)ctx->data_end;
> + void *data = (void *)(long)ctx->data;
> + unsigned int len = data_end - data;
> +
> + bpf_trace_printk(fmt, sizeof(fmt), ctx->ingress_ifindex, ctx->egress_ifindex, len);
instead of just printing ifindexes, why not return them through global
variable and validate in a test?
> +
> + return XDP_PASS;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> diff --git a/tools/testing/selftests/bpf/progs/test_xdp_with_devmap.c b/tools/testing/selftests/bpf/progs/test_xdp_with_devmap.c
> new file mode 100644
> index 000000000000..815cd59b4866
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_xdp_with_devmap.c
> @@ -0,0 +1,17 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +struct bpf_map_def SEC("maps") dm_ports = {
> + .type = BPF_MAP_TYPE_DEVMAP,
> + .key_size = sizeof(__u32),
> + .value_size = sizeof(struct devmap_val),
> + .max_entries = 4,
> +};
> +
This is an old syntax for maps, all the selftests were converted to
BTF-defined maps. Please update.
> +SEC("xdp_devmap")
> +int xdp_with_devmap(struct xdp_md *ctx)
> +{
> + return bpf_redirect_map(&dm_ports, 1, 0);
> +}
> --
> 2.21.1 (Apple Git-122.3)
>
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