From: allanzhang <allanzhang@google.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: allanzhang <allanzhang@google.com>
Subject: [PATCH] bpf: Allow bpf_skb_event_output for a few prog types
Date: Mon, 24 Jun 2019 14:58:22 -0700 [thread overview]
Message-ID: <20190624215824.118783-1-allanzhang@google.com> (raw)
Software event output is only enabled by a few prog types right now (TC,
LWT out, XDP, sockops). Many other skb based prog types need
bpf_skb_event_output to produce software event.
Added socket_filter, cg_skb, sk_skb prog types to generate sw event.
Test bpf code is generated from code snippet:
struct TMP {
uint64_t tmp;
} tt;
tt.tmp = 5;
bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
&tt, sizeof(tt));
return 1;
the bpf assembly from llvm is:
0: b7 02 00 00 05 00 00 00 r2 = 5
1: 7b 2a f8 ff 00 00 00 00 *(u64 *)(r10 - 8) = r2
2: bf a4 00 00 00 00 00 00 r4 = r10
3: 07 04 00 00 f8 ff ff ff r4 += -8
4: 18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 r2 = 0ll
6: b7 03 00 00 00 00 00 00 r3 = 0
7: b7 05 00 00 08 00 00 00 r5 = 8
8: 85 00 00 00 19 00 00 00 call 25
9: b7 00 00 00 01 00 00 00 r0 = 1
10: 95 00 00 00 00 00 00 00 exit
Patch 1 is enabling code.
Patch 2 is fullly covered selftest code.
Signed-off-by: allanzhang <allanzhang@google.com>
next reply other threads:[~2019-06-24 21:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-24 21:58 allanzhang [this message]
2019-06-24 21:58 ` [PATCH] bpf: Allow bpf_skb_event_output for a few prog types allanzhang
2019-06-24 21:58 ` allanzhang
2019-06-24 23:10 ` Song Liu
2019-06-24 23:12 ` Song Liu
2019-06-25 0:13 allanzhang
2019-06-25 0:13 ` allanzhang
2019-06-25 0:13 ` allanzhang
2019-06-25 12:06 ` Daniel Borkmann
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