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BACKPORT: bpf: Add bpf_xdp_output() helper

Browse source 
Introduce new helper that reuses existing xdp perf_event output
implementation, but can be called from raw_tracepoint programs
that receive 'struct xdp_buff *' as a tracepoint argument.

Change-Id: I418e7a0142b7f7e9f44febf5b1d6bdd5519ef5ca
Signed-off-by: Eelco Chaudron <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: John Fastabend <[email protected]>
Acked-by: Toke Høiland-Jørgensen <[email protected]>
Link: https://lore.kernel.org/bpf/158348514556.2239.11050972434793741444.stgit@xdp-tutorial
This commit is contained in:
Eelco Chaudron 2020-03-06 08:59:23 +00:00 • committed by basamaryan
commit cc217594c6
No known key found for this signature in database
GPG key ID: 210D5384FB2A5885
7 changed files with 144 additions and 2 deletions
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53
tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c
View file

@ -4,17 +4,51 @@
#include "test_xdp.skel.h"
#include "test_xdp_bpf2bpf.skel.h"
struct meta {
int ifindex;
int pkt_len;
};
static void on_sample(void *ctx, int cpu, void *data, __u32 size)
{
int duration = 0;
struct meta *meta = (struct meta *)data;
struct ipv4_packet *trace_pkt_v4 = data + sizeof(*meta);
if (CHECK(size < sizeof(pkt_v4) + sizeof(*meta),
"check_size", "size %u < %zu\n",
size, sizeof(pkt_v4) + sizeof(*meta)))
return;
if (CHECK(meta->ifindex != if_nametoindex("lo"), "check_meta_ifindex",
"meta->ifindex = %d\n", meta->ifindex))
return;
if (CHECK(meta->pkt_len != sizeof(pkt_v4), "check_meta_pkt_len",
"meta->pkt_len = %zd\n", sizeof(pkt_v4)))
return;
if (CHECK(memcmp(trace_pkt_v4, &pkt_v4, sizeof(pkt_v4)),
"check_packet_content", "content not the same\n"))
return;
*(bool *)ctx = true;
}
void test_xdp_bpf2bpf(void)
{
__u32 duration = 0, retval, size;
char buf[128];
int err, pkt_fd, map_fd;
bool passed = false;
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};
struct bpf_program *prog;
struct perf_buffer *pb = NULL;
struct perf_buffer_opts pb_opts = {};
/* Load XDP program to introspect */
pkt_skel = test_xdp__open_and_load();
@ -50,6 +84,14 @@ void test_xdp_bpf2bpf(void)
if (CHECK(err, "ftrace_attach", "ftrace attach failed: %d\n", err))
goto out;
/* Set up perf buffer */
pb_opts.sample_cb = on_sample;
pb_opts.ctx = &passed;
pb = perf_buffer__new(bpf_map__fd(ftrace_skel->maps.perf_buf_map),
1, &pb_opts);
if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb)))
goto out;
/* Run test program */
err = bpf_prog_test_run(pkt_fd, 1, &pkt_v4, sizeof(pkt_v4),
buf, &size, &retval, &duration);
@ -60,6 +102,15 @@ void test_xdp_bpf2bpf(void)
err, errno, retval, size))
goto out;
/* Make sure bpf_xdp_output() was triggered and it sent the expected
* data to the perf ring buffer.
*/
err = perf_buffer__poll(pb, 100);
if (CHECK(err < 0, "perf_buffer__poll", "err %d\n", err))
goto out;
CHECK_FAIL(!passed);
/* Verify test results */
if (CHECK(ftrace_skel->bss->test_result_fentry != if_nametoindex("lo"),
"result", "fentry failed err %llu\n",
@ -70,6 +121,8 @@ void test_xdp_bpf2bpf(void)
"fexit failed err %llu\n", ftrace_skel->bss->test_result_fexit);
out:
if (pb)
perf_buffer__free(pb);
test_xdp__destroy(pkt_skel);
test_xdp_bpf2bpf__destroy(ftrace_skel);
}

24
tools/testing/selftests/bpf/progs/test_xdp_bpf2bpf.c
View file

@ -3,6 +3,8 @@
#include "bpf_helpers.h"
#include "bpf_trace_helpers.h"
char _license[] SEC("license") = "GPL";
struct net_device {
/* Structure does not need to contain all entries,
* as "preserve_access_index" will use BTF to fix this...
@ -27,10 +29,32 @@ struct xdp_buff {
struct xdp_rxq_info *rxq;
} __attribute__((preserve_access_index));
struct meta {
int ifindex;
int pkt_len;
};
struct {
__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
__uint(key_size, sizeof(int));
__uint(value_size, sizeof(int));
} perf_buf_map SEC(".maps");
__u64 test_result_fentry = 0;
SEC("fentry/FUNC")
int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
{
struct meta meta;
void *data_end = (void *)(long)xdp->data_end;
void *data = (void *)(long)xdp->data;
meta.ifindex = xdp->rxq->dev->ifindex;
meta.pkt_len = data_end - data;
bpf_xdp_output(xdp, &perf_buf_map,
((__u64) meta.pkt_len << 32) |
BPF_F_CURRENT_CPU,
&meta, sizeof(meta));
test_result_fentry = xdp->rxq->dev->ifindex;
return 0;
}