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Message-ID: <Y9LGMha3+jPLBXsb@google.com>
Date: Thu, 26 Jan 2023 10:28:02 -0800
From: sdf@...gle.com
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
kuba@...nel.org, hawk@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, toke@...hat.com, memxor@...il.com,
alardam@...il.com, saeedm@...dia.com, anthony.l.nguyen@...el.com,
gospo@...adcom.com, vladimir.oltean@....com, nbd@....name,
john@...ozen.org, leon@...nel.org, simon.horman@...igine.com,
aelior@...vell.com, christophe.jaillet@...adoo.fr,
ecree.xilinx@...il.com, mst@...hat.com, bjorn@...nel.org,
magnus.karlsson@...el.com, maciej.fijalkowski@...el.com,
intel-wired-lan@...ts.osuosl.org, lorenzo.bianconi@...hat.com,
martin.lau@...ux.dev
Subject: Re: [PATCH v3 bpf-next 7/8] selftests/bpf: add test for bpf_xdp_query
xdp-features support
On 01/26, Lorenzo Bianconi wrote:
> Introduce a self-test to verify libbpf bpf_xdp_query capability to dump
> the xdp-features supported by the device (lo and veth in this case).
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Acked-by: Stanislav Fomichev <sdf@...gle.com>
> ---
> .../bpf/prog_tests/xdp_do_redirect.c | 27 ++++++++++++++++++-
> .../selftests/bpf/prog_tests/xdp_info.c | 8 ++++++
> 2 files changed, 34 insertions(+), 1 deletion(-)
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
> b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
> index a50971c6cf4a..e15fb3f0306c 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
> @@ -4,10 +4,12 @@
> #include <net/if.h>
> #include <linux/if_ether.h>
> #include <linux/if_packet.h>
> +#include <linux/if_link.h>
> #include <linux/ipv6.h>
> #include <linux/in6.h>
> #include <linux/udp.h>
> #include <bpf/bpf_endian.h>
> +#include <uapi/linux/netdev.h>
> #include "test_xdp_do_redirect.skel.h"
> #define SYS(fmt, ...) \
> @@ -92,7 +94,7 @@ void test_xdp_do_redirect(void)
> struct test_xdp_do_redirect *skel = NULL;
> struct nstoken *nstoken = NULL;
> struct bpf_link *link;
> -
> + LIBBPF_OPTS(bpf_xdp_query_opts, query_opts);
> struct xdp_md ctx_in = { .data = sizeof(__u32),
> .data_end = sizeof(data) };
> DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
> @@ -153,6 +155,29 @@ void test_xdp_do_redirect(void)
> !ASSERT_NEQ(ifindex_dst, 0, "ifindex_dst"))
> goto out;
> + /* Check xdp features supported by veth driver */
> + err = bpf_xdp_query(ifindex_src, XDP_FLAGS_DRV_MODE, &query_opts);
> + if (!ASSERT_OK(err, "veth_src bpf_xdp_query"))
> + goto out;
> +
> + if (!ASSERT_EQ(query_opts.fflags,
> + NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
> + NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_RX_SG |
> + NETDEV_XDP_ACT_NDO_XMIT_SG,
> + "veth_src query_opts.fflags"))
> + goto out;
> +
> + err = bpf_xdp_query(ifindex_dst, XDP_FLAGS_DRV_MODE, &query_opts);
> + if (!ASSERT_OK(err, "veth_dst bpf_xdp_query"))
> + goto out;
> +
> + if (!ASSERT_EQ(query_opts.fflags,
> + NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
> + NETDEV_XDP_ACT_NDO_XMIT | NETDEV_XDP_ACT_RX_SG |
> + NETDEV_XDP_ACT_NDO_XMIT_SG,
> + "veth_dst query_opts.fflags"))
> + goto out;
> +
> memcpy(skel->rodata->expect_dst, &pkt_udp.eth.h_dest, ETH_ALEN);
> skel->rodata->ifindex_out = ifindex_src; /* redirect back to the same
> iface */
> skel->rodata->ifindex_in = ifindex_src;
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_info.c
> b/tools/testing/selftests/bpf/prog_tests/xdp_info.c
> index cd3aa340e65e..8397468a9e74 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_info.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_info.c
> @@ -8,6 +8,7 @@ void serial_test_xdp_info(void)
> {
> __u32 len = sizeof(struct bpf_prog_info), duration = 0, prog_id;
> const char *file = "./xdp_dummy.bpf.o";
> + LIBBPF_OPTS(bpf_xdp_query_opts, opts);
> struct bpf_prog_info info = {};
> struct bpf_object *obj;
> int err, prog_fd;
> @@ -61,6 +62,13 @@ void serial_test_xdp_info(void)
> if (CHECK(prog_id, "prog_id_drv", "unexpected prog_id=%u\n", prog_id))
> goto out;
> + /* Check xdp features supported by lo device */
> + opts.fflags = ~0;
> + err = bpf_xdp_query(IFINDEX_LO, XDP_FLAGS_DRV_MODE, &opts);
> + if (!ASSERT_OK(err, "bpf_xdp_query"))
> + goto out;
> +
> + ASSERT_EQ(opts.fflags, 0, "opts.fflags");
> out:
> bpf_xdp_detach(IFINDEX_LO, 0, NULL);
> out_close:
> --
> 2.39.1
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