7c4b90d79d
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
Signed-off-by: Allan Zhang <allanzhang@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.