On 10/8/19 10:36 PM, Andrii Nakryiko wrote:
> On Fri, Oct 4, 2019 at 10:04 PM Alexei Starovoitov <ast@xxxxxxxxxx> wrote:
>>
>> Load basic cls_bpf program.
>> Load raw_tracepoint program and attach to kfree_skb raw tracepoint.
>> Trigger cls_bpf via prog_test_run.
>> At the end of test_run kernel will call kfree_skb
>> which will trigger trace_kfree_skb tracepoint.
>> Which will call our raw_tracepoint program.
>> Which will take that skb and will dump it into perf ring buffer.
>> Check that user space received correct packet.
>>
>> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
>> ---
>
> LGTM, few minor nits below.
>
> Acked-by: Andrii Nakryiko <andriin@xxxxxx>
>
>
>> .../selftests/bpf/prog_tests/kfree_skb.c | 90 +++++++++++++++++++
>> tools/testing/selftests/bpf/progs/kfree_skb.c | 76 ++++++++++++++++
>> 2 files changed, 166 insertions(+)
>> create mode 100644 tools/testing/selftests/bpf/prog_tests/kfree_skb.c
>> create mode 100644 tools/testing/selftests/bpf/progs/kfree_skb.c
>>
>> diff --git a/tools/testing/selftests/bpf/prog_tests/kfree_skb.c b/tools/testing/selftests/bpf/prog_tests/kfree_skb.c
>> new file mode 100644
>> index 000000000000..238bc7024b36
>> --- /dev/null
>> +++ b/tools/testing/selftests/bpf/prog_tests/kfree_skb.c
>> @@ -0,0 +1,90 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +#include <test_progs.h>
>> +
>> +static void on_sample(void *ctx, int cpu, void *data, __u32 size)
>> +{
>> + int ifindex = *(int *)data, duration = 0;
>> + struct ipv6_packet * pkt_v6 = data + 4;
>> +
>> + if (ifindex != 1)
>> + /* spurious kfree_skb not on loopback device */
>> + return;
>> + if (CHECK(size != 76, "check_size", "size %d != 76\n", size))
>
> compiler doesn't complain about %d and size being unsigned?
compile didn't complain. but I fixed it.
>> +SEC("raw_tracepoint/kfree_skb")
>> +int trace_kfree_skb(struct trace_kfree_skb* ctx)
>> +{
>> + struct sk_buff *skb = ctx->skb;
>> + struct net_device *dev;
>> + int ifindex;
>> + struct callback_head *ptr;
>> + void *func;
>
> nit: style checker should have complained about missing empty line
good point. Fixed checkpatch errors.
