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selftests/bpf: Add a test for attaching a bpf fentry/fexit trace to an XDP program 

Add a test that will attach a FENTRY and FEXIT program to the XDP test
program. It will also verify data from the XDP context on FENTRY and
verifies the return code on exit.

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157909410480.47481.11202505690938004673.stgit@xdp-tutorial
This commit is contained in:
Eelco Chaudron 2020-01-15 13:15:39 +00:00 committed by Alexei Starovoitov
parent 9173cac3b6
commit 83e4b88be1
2 changed files with 109 additions and 0 deletions
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65
tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include <net/if.h>
#include "test_xdp.skel.h"
#include "test_xdp_bpf2bpf.skel.h"
void test_xdp_bpf2bpf(void)
{
__u32 duration = 0, retval, size;
char buf[128];
int err, pkt_fd, map_fd;
struct iphdr *iph = (void *)buf + sizeof(struct ethhdr);
struct iptnl_info value4 = {.family = AF_INET};
struct test_xdp *pkt_skel = NULL;
struct test_xdp_bpf2bpf *ftrace_skel = NULL;
struct vip key4 = {.protocol = 6, .family = AF_INET};
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
/* Load XDP program to introspect */
pkt_skel = test_xdp__open_and_load();
if (CHECK(!pkt_skel, "pkt_skel_load", "test_xdp skeleton failed\n"))
return;
pkt_fd = bpf_program__fd(pkt_skel->progs._xdp_tx_iptunnel);
map_fd = bpf_map__fd(pkt_skel->maps.vip2tnl);
bpf_map_update_elem(map_fd, &key4, &value4, 0);
/* Load trace program */
opts.attach_prog_fd = pkt_fd,
ftrace_skel = test_xdp_bpf2bpf__open_opts(&opts);
if (CHECK(!ftrace_skel, "__open", "ftrace skeleton failed\n"))
goto out;
err = test_xdp_bpf2bpf__load(ftrace_skel);
if (CHECK(err, "__load", "ftrace skeleton failed\n"))
goto out;
err = test_xdp_bpf2bpf__attach(ftrace_skel);
if (CHECK(err, "ftrace_attach", "ftrace attach failed: %d\n", err))
goto out;
/* Run test program */
err = bpf_prog_test_run(pkt_fd, 1, &pkt_v4, sizeof(pkt_v4),
buf, &size, &retval, &duration);
if (CHECK(err || retval != XDP_TX || size != 74 ||
iph->protocol != IPPROTO_IPIP, "ipv4",
"err %d errno %d retval %d size %d\n",
err, errno, retval, size))
goto out;
/* Verify test results */
if (CHECK(ftrace_skel->bss->test_result_fentry != if_nametoindex("lo"),
"result", "fentry failed err %llu\n",
ftrace_skel->bss->test_result_fentry))
goto out;
CHECK(ftrace_skel->bss->test_result_fexit != XDP_TX, "result",
"fexit failed err %llu\n", ftrace_skel->bss->test_result_fexit);
out:
test_xdp__destroy(pkt_skel);
test_xdp_bpf2bpf__destroy(ftrace_skel);
}

44
tools/testing/selftests/bpf/progs/test_xdp_bpf2bpf.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include "bpf_helpers.h"
#include "bpf_trace_helpers.h"
struct net_device {
/* Structure does not need to contain all entries,
* as "preserve_access_index" will use BTF to fix this...
*/
int ifindex;
} __attribute__((preserve_access_index));
struct xdp_rxq_info {
/* Structure does not need to contain all entries,
* as "preserve_access_index" will use BTF to fix this...
*/
struct net_device *dev;
__u32 queue_index;
} __attribute__((preserve_access_index));
struct xdp_buff {
void *data;
void *data_end;
void *data_meta;
void *data_hard_start;
unsigned long handle;
struct xdp_rxq_info *rxq;
} __attribute__((preserve_access_index));
__u64 test_result_fentry = 0;
SEC("fentry/_xdp_tx_iptunnel")
int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
{
test_result_fentry = xdp->rxq->dev->ifindex;
return 0;
}
__u64 test_result_fexit = 0;
SEC("fexit/_xdp_tx_iptunnel")
int BPF_PROG(trace_on_exit, struct xdp_buff *xdp, int ret)
{
test_result_fexit = ret;
return 0;
}