14 Commits (11a827294755ce3d07e14cfe257b3ec16ab56f34)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Martin KaFai Lau
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555089fdfc |
bpftool: Fix printing incorrect pointer in btf_dump_ptr
For plain text output, it incorrectly prints the pointer value
"void *data". The "void *data" is actually pointing to memory that
contains a bpf-map's value. The intention is to print the content of
the bpf-map's value instead of printing the pointer pointing to the
bpf-map's value.
In this case, a member of the bpf-map's value is a pointer type.
Thus, it should print the "*(void **)data".
Fixes:
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Quentin Monnet
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22c349e8db |
tools: bpftool: fix format strings and arguments for jsonw_printf()
There are some mismatches between format strings and arguments passed to
jsonw_printf() in the BTF dumper for bpftool, which seems harmless but
may result in warnings if the "__printf()" attribute is used correctly
for jsonw_printf(). Let's fix relevant format strings and type cast.
Fixes:
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Daniel Borkmann
|
817998afa0 |
bpf: bpftool support for dumping data/bss/rodata sections
Add the ability to bpftool to handle BTF Var and DataSec kinds
in order to dump them out of btf_dumper_type(). The value has a
single object with the section name, which itself holds an array
of variables it dumps. A single variable is an object by itself
printed along with its name. From there further type information
is dumped along with corresponding value information.
Example output from .rodata:
# ./bpftool m d i 150
[{
"value": {
".rodata": [{
"load_static_data.bar": 18446744073709551615
},{
"num2": 24
},{
"num5": 43947
},{
"num6": 171
},{
"str0": [97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,0,0,0,0,0,0
]
},{
"struct0": {
"a": 42,
"b": 4278120431,
"c": 1229782938247303441
}
},{
"struct2": {
"a": 0,
"b": 0,
"c": 0
}
}
]
}
}
]
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Yonghong Song
|
e86e513854 |
tools/bpf: support __int128 in bpftool map pretty dumper
For formatted output, currently when json is enabled, the decimal
number is required. Similar to kernel bpffs printout,
for int128 numbers, only hex numbers are dumped, which are
quoted as strings.
The below is an example to show plain and json pretty print
based on the map in test_btf pretty print test.
$ bpftool m s
75: hash name pprint_test_has flags 0x0
key 4B value 112B max_entries 4 memlock 4096B
$ bpftool m d id 75
......
{
"key": 3,
"value": {
"ui32": 3,
"ui16": 0,
"si32": -3,
"unused_bits2a": 0x3,
"bits28": 0x3,
"unused_bits2b": 0x3,
"": {
"ui64": 3,
"ui8a": [3,0,0,0,0,0,0,0
]
},
"aenum": 3,
"ui32b": 4,
"bits2c": 0x1,
"si128a": 0x3,
"si128b": 0xfffffffd,
"bits3": 0x3,
"bits80": 0x10000000000000003,
"ui128": 0x20000000000000003
}
},
......
$ bptfool -p -j m d id 75
......
{
"key": ["0x03","0x00","0x00","0x00"
],
"value": ["0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0xfd","0xff","0xff","0xff","0x0f","0x00","0x00","0xc0",
"0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x03","0x00","0x00","0x00","0x04","0x00","0x00","0x00",
"0x01","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0xfd","0xff","0xff","0xff","0x00","0x00","0x00","0x00",
"0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x1b","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x08","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
"0x02","0x00","0x00","0x00","0x00","0x00","0x00","0x00"
],
"formatted": {
"key": 3,
"value": {
"ui32": 3,
"ui16": 0,
"si32": -3,
"unused_bits2a": "0x3",
"bits28": "0x3",
"unused_bits2b": "0x3",
"": {
"ui64": 3,
"ui8a": [3,0,0,0,0,0,0,0
]
},
"aenum": 3,
"ui32b": 4,
"bits2c": "0x1",
"si128a": "0x3",
"si128b": "0xfffffffd",
"bits3": "0x3",
"bits80": "0x10000000000000003",
"ui128": "0x20000000000000003"
}
}
}
......
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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Yonghong Song
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298e59d322 |
tools/bpf: fix bpftool map dump with bitfields
Commit |
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Yonghong Song
|
8772c8bc09 |
tools: bpftool: support pretty print with kind_flag set
The following example shows map pretty print with structures
which include bitfield members.
enum A { A1, A2, A3, A4, A5 };
typedef enum A ___A;
struct tmp_t {
char a1:4;
int a2:4;
int :4;
__u32 a3:4;
int b;
___A b1:4;
enum A b2:4;
};
struct bpf_map_def SEC("maps") tmpmap = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(__u32),
.value_size = sizeof(struct tmp_t),
.max_entries = 1,
};
BPF_ANNOTATE_KV_PAIR(tmpmap, int, struct tmp_t);
and the following map update in the bpf program:
key = 0;
struct tmp_t t = {};
t.a1 = 2;
t.a2 = 4;
t.a3 = 6;
t.b = 7;
t.b1 = 8;
t.b2 = 10;
bpf_map_update_elem(&tmpmap, &key, &t, 0);
With this patch, I am able to print out the map values
correctly with this patch:
bpftool map dump id 187
[{
"key": 0,
"value": {
"a1": 0x2,
"a2": 0x4,
"a3": 0x6,
"b": 7,
"b1": 0x8,
"b2": 0xa
}
}
]
Previously, if a function prototype argument has a typedef
type, the prototype is not printed since
function __btf_dumper_type_only() bailed out with error
if the type is a typedef. This commit corrected this
behavior by printing out typedef properly.
The following example shows forward type and
typedef type can be properly printed in function prototype
with modified test_btf_haskv.c.
struct t;
union u;
__attribute__((noinline))
static int test_long_fname_1(struct dummy_tracepoint_args *arg,
struct t *p1, union u *p2,
__u32 unused)
...
int _dummy_tracepoint(struct dummy_tracepoint_args *arg) {
return test_long_fname_1(arg, 0, 0, 0);
}
$ bpftool p d xlated id 24
...
int test_long_fname_1(struct dummy_tracepoint_args * arg,
struct t * p1, union u * p2,
__u32 unused)
...
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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Yonghong Song
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9f95e37e31 |
tools: bpftool: refactor btf_dumper_int_bits()
The core dump funcitonality in btf_dumper_int_bits() is refactored into a separate function btf_dumper_bitfield() which will be used by the next patch. Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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Jakub Kicinski
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907b223651 |
tools: bpftool: dual license all files
Currently bpftool contains a mix of GPL-only and GPL or BSD2 licensed files. Make sure all files are dual licensed under GPLv2 and BSD-2-Clause. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: YueHaibing <yuehaibing@huawei.com> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Stanislav Fomichev <sdf@google.com> Acked-by: Sean Young <sean@mess.org> Acked-by: Jiri Benc <jbenc@redhat.com> Acked-by: David Calavera <david.calavera@gmail.com> Acked-by: Andrey Ignatov <rdna@fb.com> Acked-by: Joe Stringer <joe@wand.net.nz> Acked-by: David Ahern <dsahern@gmail.com> Acked-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Acked-by: Petar Penkov <ppenkov@stanford.edu> Acked-by: Sandipan Das <sandipan@linux.ibm.com> Acked-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Acked-by: Stephen Hemminger <stephen@networkplumber.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Taeung Song <treeze.taeung@gmail.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> CC: okash.khawaja@gmail.com Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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David S. Miller
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addb067983 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Daniel Borkmann says:
====================
pull-request: bpf-next 2018-12-11
The following pull-request contains BPF updates for your *net-next* tree.
It has three minor merge conflicts, resolutions:
1) tools/testing/selftests/bpf/test_verifier.c
Take first chunk with alignment_prevented_execution.
2) net/core/filter.c
[...]
case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
case bpf_ctx_range(struct __sk_buff, wire_len):
return false;
[...]
3) include/uapi/linux/bpf.h
Take the second chunk for the two cases each.
The main changes are:
1) Add support for BPF line info via BTF and extend libbpf as well
as bpftool's program dump to annotate output with BPF C code to
facilitate debugging and introspection, from Martin.
2) Add support for BPF_ALU | BPF_ARSH | BPF_{K,X} in interpreter
and all JIT backends, from Jiong.
3) Improve BPF test coverage on archs with no efficient unaligned
access by adding an "any alignment" flag to the BPF program load
to forcefully disable verifier alignment checks, from David.
4) Add a new bpf_prog_test_run_xattr() API to libbpf which allows for
proper use of BPF_PROG_TEST_RUN with data_out, from Lorenz.
5) Extend tc BPF programs to use a new __sk_buff field called wire_len
for more accurate accounting of packets going to wire, from Petar.
6) Improve bpftool to allow dumping the trace pipe from it and add
several improvements in bash completion and map/prog dump,
from Quentin.
7) Optimize arm64 BPF JIT to always emit movn/movk/movk sequence for
kernel addresses and add a dedicated BPF JIT backend allocator,
from Ard.
8) Add a BPF helper function for IR remotes to report mouse movements,
from Sean.
9) Various cleanups in BPF prog dump e.g. to make UAPI bpf_prog_info
member naming consistent with existing conventions, from Yonghong
and Song.
10) Misc cleanups and improvements in allowing to pass interface name
via cmdline for xdp1 BPF example, from Matteo.
11) Fix a potential segfault in BPF sample loader's kprobes handling,
from Daniel T.
12) Fix SPDX license in libbpf's README.rst, from Andrey.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller
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4cc1feeb6f |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Several conflicts, seemingly all over the place. I used Stephen Rothwell's sample resolutions for many of these, if not just to double check my own work, so definitely the credit largely goes to him. The NFP conflict consisted of a bug fix (moving operations past the rhashtable operation) while chaning the initial argument in the function call in the moved code. The net/dsa/master.c conflict had to do with a bug fix intermixing of making dsa_master_set_mtu() static with the fixing of the tagging attribute location. cls_flower had a conflict because the dup reject fix from Or overlapped with the addition of port range classifiction. __set_phy_supported()'s conflict was relatively easy to resolve because Andrew fixed it in both trees, so it was just a matter of taking the net-next copy. Or at least I think it was :-) Joe Stringer's fix to the handling of netns id 0 in bpf_sk_lookup() intermixed with changes on how the sdif and caller_net are calculated in these code paths in net-next. The remaining BPF conflicts were largely about the addition of the __bpf_md_ptr stuff in 'net' overlapping with adjustments and additions to the relevant data structure where the MD pointer macros are used. Signed-off-by: David S. Miller <davem@davemloft.net> |
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Martin KaFai Lau
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b053b439b7 |
bpf: libbpf: bpftool: Print bpf_line_info during prog dump
This patch adds print bpf_line_info function in 'prog dump jitted' and 'prog dump xlated': [root@arch-fb-vm1 bpf]# ~/devshare/fb-kernel/linux/tools/bpf/bpftool/bpftool prog dump jited pinned /sys/fs/bpf/test_btf_haskv [...] int test_long_fname_2(struct dummy_tracepoint_args * arg): bpf_prog_44a040bf25481309_test_long_fname_2: ; static int test_long_fname_2(struct dummy_tracepoint_args *arg) 0: push %rbp 1: mov %rsp,%rbp 4: sub $0x30,%rsp b: sub $0x28,%rbp f: mov %rbx,0x0(%rbp) 13: mov %r13,0x8(%rbp) 17: mov %r14,0x10(%rbp) 1b: mov %r15,0x18(%rbp) 1f: xor %eax,%eax 21: mov %rax,0x20(%rbp) 25: xor %esi,%esi ; int key = 0; 27: mov %esi,-0x4(%rbp) ; if (!arg->sock) 2a: mov 0x8(%rdi),%rdi ; if (!arg->sock) 2e: cmp $0x0,%rdi 32: je 0x0000000000000070 34: mov %rbp,%rsi ; counts = bpf_map_lookup_elem(&btf_map, &key); 37: add $0xfffffffffffffffc,%rsi 3b: movabs $0xffff8881139d7480,%rdi 45: add $0x110,%rdi 4c: mov 0x0(%rsi),%eax 4f: cmp $0x4,%rax 53: jae 0x000000000000005e 55: shl $0x3,%rax 59: add %rdi,%rax 5c: jmp 0x0000000000000060 5e: xor %eax,%eax ; if (!counts) 60: cmp $0x0,%rax 64: je 0x0000000000000070 ; counts->v6++; 66: mov 0x4(%rax),%edi 69: add $0x1,%rdi 6d: mov %edi,0x4(%rax) 70: mov 0x0(%rbp),%rbx 74: mov 0x8(%rbp),%r13 78: mov 0x10(%rbp),%r14 7c: mov 0x18(%rbp),%r15 80: add $0x28,%rbp 84: leaveq 85: retq [...] With linum: [root@arch-fb-vm1 bpf]# ~/devshare/fb-kernel/linux/tools/bpf/bpftool/bpftool prog dump jited pinned /sys/fs/bpf/test_btf_haskv linum int _dummy_tracepoint(struct dummy_tracepoint_args * arg): bpf_prog_b07ccb89267cf242__dummy_tracepoint: ; return test_long_fname_1(arg); [file:/data/users/kafai/fb-kernel/linux/tools/testing/selftests/bpf/test_btf_haskv.c line_num:54 line_col:9] 0: push %rbp 1: mov %rsp,%rbp 4: sub $0x28,%rsp b: sub $0x28,%rbp f: mov %rbx,0x0(%rbp) 13: mov %r13,0x8(%rbp) 17: mov %r14,0x10(%rbp) 1b: mov %r15,0x18(%rbp) 1f: xor %eax,%eax 21: mov %rax,0x20(%rbp) 25: callq 0x000000000000851e ; return test_long_fname_1(arg); [file:/data/users/kafai/fb-kernel/linux/tools/testing/selftests/bpf/test_btf_haskv.c line_num:54 line_col:2] 2a: xor %eax,%eax 2c: mov 0x0(%rbp),%rbx 30: mov 0x8(%rbp),%r13 34: mov 0x10(%rbp),%r14 38: mov 0x18(%rbp),%r15 3c: add $0x28,%rbp 40: leaveq 41: retq [...] Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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Yonghong Song
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528bff0cdb |
tools: bpftool: fix a bitfield pretty print issue
Commit |
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Yonghong Song
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254471e57a |
tools/bpf: bpftool: add support for func types
This patch added support to print function signature
if btf func_info is available. Note that ksym
now uses function name instead of prog_name as
prog_name has a limit of 16 bytes including
ending '\0'.
The following is a sample output for selftests
test_btf with file test_btf_haskv.o for translated insns
and jited insns respectively.
$ bpftool prog dump xlated id 1
int _dummy_tracepoint(struct dummy_tracepoint_args * arg):
0: (85) call pc+2#bpf_prog_2dcecc18072623fc_test_long_fname_1
1: (b7) r0 = 0
2: (95) exit
int test_long_fname_1(struct dummy_tracepoint_args * arg):
3: (85) call pc+1#bpf_prog_89d64e4abf0f0126_test_long_fname_2
4: (95) exit
int test_long_fname_2(struct dummy_tracepoint_args * arg):
5: (b7) r2 = 0
6: (63) *(u32 *)(r10 -4) = r2
7: (79) r1 = *(u64 *)(r1 +8)
...
22: (07) r1 += 1
23: (63) *(u32 *)(r0 +4) = r1
24: (95) exit
$ bpftool prog dump jited id 1
int _dummy_tracepoint(struct dummy_tracepoint_args * arg):
bpf_prog_b07ccb89267cf242__dummy_tracepoint:
0: push %rbp
1: mov %rsp,%rbp
......
3c: add $0x28,%rbp
40: leaveq
41: retq
int test_long_fname_1(struct dummy_tracepoint_args * arg):
bpf_prog_2dcecc18072623fc_test_long_fname_1:
0: push %rbp
1: mov %rsp,%rbp
......
3a: add $0x28,%rbp
3e: leaveq
3f: retq
int test_long_fname_2(struct dummy_tracepoint_args * arg):
bpf_prog_89d64e4abf0f0126_test_long_fname_2:
0: push %rbp
1: mov %rsp,%rbp
......
80: add $0x28,%rbp
84: leaveq
85: retq
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Okash Khawaja
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b12d6ec097 |
bpf: btf: add btf print functionality
This consumes functionality exported in the previous patch. It does the
main job of printing with BTF data. This is used in the following patch
to provide a more readable output of a map's dump. It relies on
json_writer to do json printing. Below is sample output where map keys
are ints and values are of type struct A:
typedef int int_type;
enum E {
E0,
E1,
};
struct B {
int x;
int y;
};
struct A {
int m;
unsigned long long n;
char o;
int p[8];
int q[4][8];
enum E r;
void *s;
struct B t;
const int u;
int_type v;
unsigned int w1: 3;
unsigned int w2: 3;
};
$ sudo bpftool map dump id 14
[{
"key": 0,
"value": {
"m": 1,
"n": 2,
"o": "c",
"p": [15,16,17,18,15,16,17,18
],
"q": [[25,26,27,28,25,26,27,28
],[35,36,37,38,35,36,37,38
],[45,46,47,48,45,46,47,48
],[55,56,57,58,55,56,57,58
]
],
"r": 1,
"s": 0x7ffd80531cf8,
"t": {
"x": 5,
"y": 10
},
"u": 100,
"v": 20,
"w1": 0x7,
"w2": 0x3
}
}
]
This patch uses json's {} and [] to imply struct/union and array. More
explicit information can be added later. For example, a command line
option can be introduced to print whether a key or value is struct
or union, name of a struct etc. This will however come at the expense
of duplicating info when, for example, printing an array of structs.
enums are printed as ints without their names.
Signed-off-by: Okash Khawaja <osk@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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