openwrt/staging/blogic.git
5 years agoselftests/bpf: add CO-RE relocs ints tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:40:00 +0000 (14:40 -0700)]
selftests/bpf: add CO-RE relocs ints tests

Add various tests validating handling compatible/incompatible integer
types.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs ptr-as-array tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:59 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs ptr-as-array tests

Add test validating correct relocation handling for cases where pointer
to something is used as an array. E.g.:

  int *ptr = ...;
  int x = ptr[42];

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs modifiers/typedef tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:58 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs modifiers/typedef tests

Add tests validating correct handling of various combinations of
typedefs and const/volatile/restrict modifiers.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs enum/ptr/func_proto tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:57 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs enum/ptr/func_proto tests

Test CO-RE relocation handling of ints, enums, pointers, func protos, etc.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs array tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:56 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs array tests

Add tests for various array handling/relocation scenarios.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs nesting tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:55 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs nesting tests

Add a bunch of test validating correct handling of nested
structs/unions.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs struct flavors tests
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:54 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs struct flavors tests

Add tests verifying that BPF program can use various struct/union
"flavors" to extract data from the same target struct/union.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add CO-RE relocs testing setup
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:53 +0000 (14:39 -0700)]
selftests/bpf: add CO-RE relocs testing setup

Add CO-RE relocation test runner. Add one simple test validating that
libbpf's logic for searching for kernel image and loading BTF out of it
works.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add BPF_CORE_READ relocatable read macro
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:52 +0000 (14:39 -0700)]
selftests/bpf: add BPF_CORE_READ relocatable read macro

Add BPF_CORE_READ macro used in tests to do bpf_core_read(), which
automatically captures offset relocation.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: implement BPF CO-RE offset relocation algorithm
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:51 +0000 (14:39 -0700)]
libbpf: implement BPF CO-RE offset relocation algorithm

This patch implements the core logic for BPF CO-RE offsets relocations.
Every instruction that needs to be relocated has corresponding
bpf_offset_reloc as part of BTF.ext. Relocations are performed by trying
to match recorded "local" relocation spec against potentially many
compatible "target" types, creating corresponding spec. Details of the
algorithm are noted in corresponding comments in the code.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: add .BTF.ext offset relocation section loading
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:50 +0000 (14:39 -0700)]
libbpf: add .BTF.ext offset relocation section loading

Add support for BPF CO-RE offset relocations. Add section/record
iteration macros for .BTF.ext. These macro are useful for iterating over
each .BTF.ext record, either for dumping out contents or later for BPF
CO-RE relocation handling.

To enable other parts of libbpf to work with .BTF.ext contents, moved
a bunch of type definitions into libbpf_internal.h.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: convert libbpf code to use new btf helpers
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:49 +0000 (14:39 -0700)]
libbpf: convert libbpf code to use new btf helpers

Simplify code by relying on newly added BTF helper functions.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: add helpers for working with BTF types
Andrii Nakryiko [Wed, 7 Aug 2019 21:39:48 +0000 (14:39 -0700)]
libbpf: add helpers for working with BTF types

Add lots of frequently used helpers that simplify working with BTF
types.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoMerge branch 'test_progs-stdio'
Alexei Starovoitov [Wed, 7 Aug 2019 00:17:52 +0000 (17:17 -0700)]
Merge branch 'test_progs-stdio'

Stanislav Fomichev says:

====================
I was looking into converting test_sockops* to test_progs framework
and that requires using cgroup_helpers.c which rely on stdio/stderr.
Let's use open_memstream to override stdout into buffer during
subtests instead of custom test_{v,}printf wrappers. That lets
us continue to use stdio in the subtests and dump it on failure
if required.

That would also fix bpf_find_map which currently uses printf to
signal failure (missed during test_printf conversion).
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: test_progs: drop extra trailing tab
Stanislav Fomichev [Tue, 6 Aug 2019 17:45:29 +0000 (10:45 -0700)]
selftests/bpf: test_progs: drop extra trailing tab

Small (un)related cleanup.

Cc: Andrii Nakryiko <andriin@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: test_progs: test__printf -> printf
Stanislav Fomichev [Tue, 6 Aug 2019 17:45:28 +0000 (10:45 -0700)]
selftests/bpf: test_progs: test__printf -> printf

Now that test__printf is a simple wraper around printf, let's drop it
(and test__vprintf as well).

Cc: Andrii Nakryiko <andriin@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: test_progs: switch to open_memstream
Stanislav Fomichev [Tue, 6 Aug 2019 17:45:27 +0000 (10:45 -0700)]
selftests/bpf: test_progs: switch to open_memstream

Use open_memstream to override stdout during test execution.
The copy of the original stdout is held in env.stdout and used
to print subtest info and dump failed log.

test_{v,}printf are now simple wrappers around stdout and will be
removed in the next patch.

v5:
* fix -v crash by always setting env.std{in,err} (Alexei Starovoitov)
* drop force_log check from stdio_hijack (Andrii Nakryiko)

v4:
* one field per line for stdout/stderr (Andrii Nakryiko)

v3:
* don't do strlen over log_buf, log_cnt has it already (Andrii Nakryiko)

v2:
* add ifdef __GLIBC__ around open_memstream (maybe pointless since
  we already depend on glibc for argp_parse)
* hijack stderr as well (Andrii Nakryiko)
* don't hijack for every test, do it once (Andrii Nakryiko)
* log_cap -> log_size (Andrii Nakryiko)
* do fseeko in a proper place (Andrii Nakryiko)
* check open_memstream returned value (Andrii Nakryiko)

Cc: Andrii Nakryiko <andriin@fb.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add loop test 5
Alexei Starovoitov [Fri, 2 Aug 2019 23:23:40 +0000 (16:23 -0700)]
selftests/bpf: add loop test 5

Add a test with multiple exit conditions.
It's not an infinite loop only when the verifier can properly track
all math on variable 'i' through all possible ways of executing this loop.

barrier()s are needed to disable llvm optimization that combines multiple
branches into fewer branches.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
5 years agoselftests/bpf: add loop test 4
Alexei Starovoitov [Fri, 2 Aug 2019 22:54:01 +0000 (15:54 -0700)]
selftests/bpf: add loop test 4

Add a test that returns a 'random' number between [0, 2^20)
If state pruning is not working correctly for loop body the number of
processed insns will be 2^20 * num_of_insns_in_loop_body and the program
will be rejected.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
5 years agoMerge branch 'setsockopt-extra-mem'
Alexei Starovoitov [Thu, 1 Aug 2019 20:55:53 +0000 (13:55 -0700)]
Merge branch 'setsockopt-extra-mem'

Stanislav Fomichev says:

====================
Current setsockopt hook is limited to the size of the buffer that
user had supplied. Since we always allocate memory and copy the value
into kernel space, allocate just a little bit more in case BPF
program needs to override input data with a larger value.

The canonical example is TCP_CONGESTION socket option where
input buffer is a string and if user calls it with a short string,
BPF program has no way of extending it.

The tests are extended with TCP_CONGESTION use case.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: extend sockopt_sk selftest with TCP_CONGESTION use case
Stanislav Fomichev [Mon, 29 Jul 2019 21:51:11 +0000 (14:51 -0700)]
selftests/bpf: extend sockopt_sk selftest with TCP_CONGESTION use case

Ignore SOL_TCP:TCP_CONGESTION in getsockopt and always override
SOL_TCP:TCP_CONGESTION with "cubic" in setsockopt hook.

Call setsockopt(SOL_TCP, TCP_CONGESTION) with short optval ("nv")
to make sure BPF program has enough buffer space to replace it
with "cubic".

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf: always allocate at least 16 bytes for setsockopt hook
Stanislav Fomichev [Mon, 29 Jul 2019 21:51:10 +0000 (14:51 -0700)]
bpf: always allocate at least 16 bytes for setsockopt hook

Since we always allocate memory, allocate just a little bit more
for the BPF program in case it need to override user input with
bigger value. The canonical example is TCP_CONGESTION where
input string might be too small to override (nv -> bbr or cubic).

16 bytes are chosen to match the size of TCP_CA_NAME_MAX and can
be extended in the future if needed.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotools: bpftool: add support for reporting the effective cgroup progs
Jakub Kicinski [Tue, 30 Jul 2019 21:03:00 +0000 (14:03 -0700)]
tools: bpftool: add support for reporting the effective cgroup progs

Takshak said in the original submission:

With different bpf attach_flags available to attach bpf programs specially
with BPF_F_ALLOW_OVERRIDE and BPF_F_ALLOW_MULTI, the list of effective
bpf-programs available to any sub-cgroups really needs to be available for
easy debugging.

Using BPF_F_QUERY_EFFECTIVE flag, one can get the list of not only attached
bpf-programs to a cgroup but also the inherited ones from parent cgroup.

So a new option is introduced to use BPF_F_QUERY_EFFECTIVE query flag here
to list all the effective bpf-programs available for execution at a specified
cgroup.

Reused modified test program test_cgroup_attach from tools/testing/selftests/bpf:
  # ./test_cgroup_attach

With old bpftool:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/
  ID       AttachType      AttachFlags     Name
  271      egress          multi           pkt_cntr_1
  272      egress          multi           pkt_cntr_2

Attached new program pkt_cntr_4 in cg2 gives following:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2
  ID       AttachType      AttachFlags     Name
  273      egress          override        pkt_cntr_4

And with new "effective" option it shows all effective programs for cg2:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2 effective
  ID       AttachType      AttachFlags     Name
  273      egress          override        pkt_cntr_4
  271      egress          override        pkt_cntr_1
  272      egress          override        pkt_cntr_2

Compared to original submission use a local flag instead of global
option.

We need to clear query_flags on every command, in case batch mode
wants to use varying settings.

v2: (Takshak)
 - forbid duplicated flags;
 - fix cgroup path freeing.

Signed-off-by: Takshak Chahande <ctakshak@fb.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Takshak Chahande <ctakshak@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: fix clearing buffered output between tests/subtests
Andrii Nakryiko [Tue, 30 Jul 2019 18:05:41 +0000 (11:05 -0700)]
selftests/bpf: fix clearing buffered output between tests/subtests

Clear buffered output once test or subtests finishes even if test was
successful. Not doing this leads to accumulation of output from previous
tests and on first failed tests lots of irrelevant output will be
dumped, greatly confusing things.

v1->v2: fix Fixes tag, add more context to patch

Fixes: 3a516a0a3a7b ("selftests/bpf: add sub-tests support for test_progs")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoMerge branch 'gen-syn-cookie'
Alexei Starovoitov [Wed, 31 Jul 2019 04:03:06 +0000 (21:03 -0700)]
Merge branch 'gen-syn-cookie'

Petar Penkov says:

====================
This patch series introduces a BPF helper function that allows generating SYN
cookies from BPF. Currently, this helper is enabled at both the TC hook and the
XDP hook.

The first two patches in the series add/modify several TCP helper functions to
allow for SKB-less operation, as is the case at the XDP hook.

The third patch introduces the bpf_tcp_gen_syncookie helper function which
generates a SYN cookie for either XDP or TC programs. The return value of
this function contains both the MSS value, encoded in the cookie, and the
cookie itself.

The last three patches sync tools/ and add a test.

Performance evaluation:
I sent 10Mpps to a fixed port on a host with 2 10G bonded Mellanox 4 NICs from
random IPv6 source addresses. Without XDP I observed 7.2Mpps (syn-acks) being
sent out if the IPv6 packets carry 20 bytes of TCP options or 7.6Mpps if they
carry no options. If I attached a simple program that checks if a packet is
IPv6/TCP/SYN, looks up the socket, issues a cookie, and sends it back out after
swapping src/dest, recomputing the checksum, and setting the ACK flag, I
observed 10Mpps being sent back out.

Changes since v1:
1/ Added performance numbers to the cover letter
2/ Patch 2: Refactored a bit to fix compilation issues
3/ Patch 3: Changed ENOTSUPP to EOPNOTSUPP at Toke's suggestion

Changes since RFC:
1/ Cookie is returned in host order at Alexei's suggestion
2/ If cookies are not enabled via a sysctl, the helper function returns
   -ENOENT instead of -EINVAL at Lorenz's suggestion
3/ Fixed documentation to properly reflect that MSS is 16 bits at
   Lorenz's suggestion
4/ BPF helper requires TCP length to match ->doff field, rather than to simply
   be no more than 20 bytes at Eric and Alexei's suggestion
5/ Packet type is looked up from the packet version field, rather than from the
   socket. v4 packets are rejected on v6-only sockets but should work with
   dual stack listeners at Eric's suggestion
6/ Removed unnecessary `net` argument from helper function in patch 2 at
   Lorenz's suggestion
7/ Changed test to only pass MSS option so we can convince the verifier that the
   memory access is not out of bounds

Note that 7/ below illustrates the verifier might need to be extended to allow
passing a variable tcph->doff to the helper function like below:

__u32 thlen = tcph->doff * 4;
if (thlen < sizeof(*tcph))
return;
__s64 cookie = bpf_tcp_gen_syncookie(sk, ipv4h, 20, tcph, thlen);
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add test for bpf_tcp_gen_syncookie
Petar Penkov [Mon, 29 Jul 2019 16:59:18 +0000 (09:59 -0700)]
selftests/bpf: add test for bpf_tcp_gen_syncookie

Modify the existing bpf_tcp_check_syncookie test to also generate a
SYN cookie, pass the packet to the kernel, and verify that the two
cookies are the same (and both valid). Since cloned SKBs are skipped
during generic XDP, this test does not issue a SYN cookie when run in
XDP mode. We therefore only check that a valid SYN cookie was issued at
the TC hook.

Additionally, verify that the MSS for that SYN cookie is within
expected range.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: bpf_tcp_gen_syncookie->bpf_helpers
Petar Penkov [Mon, 29 Jul 2019 16:59:17 +0000 (09:59 -0700)]
selftests/bpf: bpf_tcp_gen_syncookie->bpf_helpers

Expose bpf_tcp_gen_syncookie to selftests.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf: sync bpf.h to tools/
Petar Penkov [Mon, 29 Jul 2019 16:59:16 +0000 (09:59 -0700)]
bpf: sync bpf.h to tools/

Sync updated documentation for bpf_redirect_map.

Sync the bpf_tcp_gen_syncookie helper function definition with the one
in tools/uapi.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf: add bpf_tcp_gen_syncookie helper
Petar Penkov [Mon, 29 Jul 2019 16:59:15 +0000 (09:59 -0700)]
bpf: add bpf_tcp_gen_syncookie helper

This helper function allows BPF programs to try to generate SYN
cookies, given a reference to a listener socket. The function works
from XDP and with an skb context since bpf_skc_lookup_tcp can lookup a
socket in both cases.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotcp: add skb-less helpers to retrieve SYN cookie
Petar Penkov [Mon, 29 Jul 2019 16:59:14 +0000 (09:59 -0700)]
tcp: add skb-less helpers to retrieve SYN cookie

This patch allows generation of a SYN cookie before an SKB has been
allocated, as is the case at XDP.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotcp: tcp_syn_flood_action read port from socket
Petar Penkov [Mon, 29 Jul 2019 16:59:13 +0000 (09:59 -0700)]
tcp: tcp_syn_flood_action read port from socket

This allows us to call this function before an SKB has been
allocated.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoMerge branch 'devmap_hash'
Alexei Starovoitov [Mon, 29 Jul 2019 20:50:55 +0000 (13:50 -0700)]
Merge branch 'devmap_hash'

Toke Høiland-Jørgensen says:

====================
This series adds a new map type, devmap_hash, that works like the existing
devmap type, but using a hash-based indexing scheme. This is useful for the use
case where a devmap is indexed by ifindex (for instance for use with the routing
table lookup helper). For this use case, the regular devmap needs to be sized
after the maximum ifindex number, not the number of devices in it. A hash-based
indexing scheme makes it possible to size the map after the number of devices it
should contain instead.

This was previously part of my patch series that also turned the regular
bpf_redirect() helper into a map-based one; for this series I just pulled out
the patches that introduced the new map type.

Changelog:

v5:

- Dynamically set the number of hash buckets by rounding up max_entries to the
  nearest power of two (mirroring the regular hashmap), as suggested by Jesper.

v4:

- Remove check_memlock parameter that was left over from an earlier patch
  series.
- Reorder struct members to avoid holes.

v3:

- Rework the split into different patches
- Use spin_lock_irqsave()
- Also add documentation and bash completion definitions for bpftool

v2:

- Split commit adding the new map type so uapi and tools changes are separate.

Changes to these patches since the previous series:

- Rebase on top of the other devmap changes (makes this one simpler!)
- Don't enforce key==val, but allow arbitrary indexes.
- Rename the type to devmap_hash to reflect the fact that it's just a hashmap now.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotools: Add definitions for devmap_hash map type
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:58 +0000 (18:06 +0200)]
tools: Add definitions for devmap_hash map type

This adds selftest and bpftool updates for the devmap_hash map type.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotools/libbpf_probes: Add new devmap_hash type
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:57 +0000 (18:06 +0200)]
tools/libbpf_probes: Add new devmap_hash type

This adds the definition for BPF_MAP_TYPE_DEVMAP_HASH to libbpf_probes.c in
tools/lib/bpf.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotools/include/uapi: Add devmap_hash BPF map type
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:56 +0000 (18:06 +0200)]
tools/include/uapi: Add devmap_hash BPF map type

This adds the devmap_hash BPF map type to the uapi headers in tools/.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoxdp: Add devmap_hash map type for looking up devices by hashed index
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:55 +0000 (18:06 +0200)]
xdp: Add devmap_hash map type for looking up devices by hashed index

A common pattern when using xdp_redirect_map() is to create a device map
where the lookup key is simply ifindex. Because device maps are arrays,
this leaves holes in the map, and the map has to be sized to fit the
largest ifindex, regardless of how many devices actually are actually
needed in the map.

This patch adds a second type of device map where the key is looked up
using a hashmap, instead of being used as an array index. This allows maps
to be densely packed, so they can be smaller.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoxdp: Refactor devmap allocation code for reuse
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:53 +0000 (18:06 +0200)]
xdp: Refactor devmap allocation code for reuse

The subsequent patch to add a new devmap sub-type can re-use much of the
initialisation and allocation code, so refactor it into separate functions.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoinclude/bpf.h: Remove map_insert_ctx() stubs
Toke Høiland-Jørgensen [Fri, 26 Jul 2019 16:06:52 +0000 (18:06 +0200)]
include/bpf.h: Remove map_insert_ctx() stubs

When we changed the device and CPU maps to use linked lists instead of
bitmaps, we also removed the need for the map_insert_ctx() helpers to keep
track of the bitmaps inside each map. However, it seems I forgot to remove
the function definitions stubs, so remove those here.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoMerge branch 'revamp-test_progs'
Alexei Starovoitov [Sun, 28 Jul 2019 05:36:20 +0000 (22:36 -0700)]
Merge branch 'revamp-test_progs'

Andrii Nakryiko says:

====================
This patch set makes a number of changes to test_progs selftest, which is
a collection of many other tests (and sometimes sub-tests as well), to provide
better testing experience and allow to start convering many individual test
programs under selftests/bpf into a single and convenient test runner.

Patch #1 fixes issue with Makefile, which makes prog_tests/test.h compiled as
a C code. This fix allows to change how test.h is generated, providing ability
to have more control on what and how tests are run.

Patch #2 changes how test.h is auto-generated, which allows to have test
definitions, instead of just running test functions. This gives ability to do
more complicated test run policies.

Patch #3 adds `-t <test-name>` and `-n <test-num>` selectors to run only
subset of tests.

Patch #4 changes libbpf_set_print() to return previously set print callback,
allowing to temporarily replace current print callback and then set it back.
This is necessary for some tests that want more control over libbpf logging.

Patch #5 sets up and takes over libbpf logging from individual tests to
test_prog runner, adding -vv verbosity to capture debug output from libbpf.
This is useful when debugging failing tests.

Patch #6 furthers test output management and buffers it by default, emitting
log output only if test fails. This give succinct and clean default test
output. It's possible to bypass this behavior with -v flag, which will turn
off test output buffering.

Patch #7 adds support for sub-tests. It also enhances -t and -n selectors to
both support ability to specify sub-test selectors, as well as enhancing
number selector to accept sets of test, instead of just individual test
number.

Patch #8 converts bpf_verif_scale.c test to use sub-test APIs.

Patch #9 converts send_signal.c tests to use sub-test APIs.

v2->v3:
  - fix buffered output rare unitialized value bug (Alexei);
  - fix buffered output va_list reuse bug (Alexei);
  - fix buffered output truncation due to interleaving zero terminators;

v1->v2:
  - drop libbpf_swap_print, instead return previous function from
    libbpf_set_print (Stanislav);
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: convert send_signal.c to use subtests
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:31 +0000 (20:25 -0700)]
selftests/bpf: convert send_signal.c to use subtests

Convert send_signal set of tests to be exposed as three sub-tests.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: convert bpf_verif_scale.c to sub-tests API
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:30 +0000 (20:25 -0700)]
selftests/bpf: convert bpf_verif_scale.c to sub-tests API

Expose each BPF verifier scale test as individual sub-test to allow
independent results output and test selection.

Test run results now look like this:

  $ sudo ./test_progs -t verif/
  #3/1 loop3.o:OK
  #3/2 test_verif_scale1.o:OK
  #3/3 test_verif_scale2.o:OK
  #3/4 test_verif_scale3.o:OK
  #3/5 pyperf50.o:OK
  #3/6 pyperf100.o:OK
  #3/7 pyperf180.o:OK
  #3/8 pyperf600.o:OK
  #3/9 pyperf600_nounroll.o:OK
  #3/10 loop1.o:OK
  #3/11 loop2.o:OK
  #3/12 strobemeta.o:OK
  #3/13 strobemeta_nounroll1.o:OK
  #3/14 strobemeta_nounroll2.o:OK
  #3/15 test_sysctl_loop1.o:OK
  #3/16 test_sysctl_loop2.o:OK
  #3/17 test_xdp_loop.o:OK
  #3/18 test_seg6_loop.o:OK
  #3 bpf_verif_scale:OK

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add sub-tests support for test_progs
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:29 +0000 (20:25 -0700)]
selftests/bpf: add sub-tests support for test_progs

Allow tests to have their own set of sub-tests. Also add ability to do
test/subtest selection using `-t <test-name>/<subtest-name>` and `-n
<test-nums-set>/<subtest-nums-set>`, as an extension of existing -t/-n
selector options. For the <test-num-set> format: it's a comma-separated
list of either individual test numbers (1-based), or range of test
numbers. E.g., all of the following are valid sets of test numbers:
  - 10
  - 1,2,3
  - 1-3
  - 5-10,1,3-4

'/<subtest' part is optional, but has the same format. E.g., to select
test #3 and its sub-tests #10 through #15, use: -t 3/10-15.

Similarly, to select tests by name, use `-t verif/strobe`:

  $ sudo ./test_progs -t verif/strobe
  #3/12 strobemeta.o:OK
  #3/13 strobemeta_nounroll1.o:OK
  #3/14 strobemeta_nounroll2.o:OK
  #3 bpf_verif_scale:OK
  Summary: 1/3 PASSED, 0 FAILED

Example of using subtest API is in the next patch, converting
bpf_verif_scale.c tests to use sub-tests.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: abstract away test log output
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:28 +0000 (20:25 -0700)]
selftests/bpf: abstract away test log output

This patch changes how test output is printed out. By default, if test
had no errors, the only output will be a single line with test number,
name, and verdict at the end, e.g.:

  #31 xdp:OK

If test had any errors, all log output captured during test execution
will be output after test completes.

It's possible to force output of log with `-v` (`--verbose`) option, in
which case output won't be buffered and will be output immediately.

To support this, individual tests are required to use helper methods for
logging: `test__printf()` and `test__vprintf()`.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftest/bpf: centralize libbpf logging management for test_progs
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:27 +0000 (20:25 -0700)]
selftest/bpf: centralize libbpf logging management for test_progs

Make test_progs test runner own libbpf logging. Also introduce two
levels of verbosity: -v and -vv. First one will be used in subsequent
patches to enable test log output always. Second one increases verbosity
level of libbpf logging further to include debug output as well.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: return previous print callback from libbpf_set_print
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:26 +0000 (20:25 -0700)]
libbpf: return previous print callback from libbpf_set_print

By returning previously set print callback from libbpf_set_print, it's
possible to restore it, eventually. This is useful when running many
independent test with one default print function, but overriding log
verbosity for particular subset of tests.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: add test selectors by number and name to test_progs
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:25 +0000 (20:25 -0700)]
selftests/bpf: add test selectors by number and name to test_progs

Add ability to specify either test number or test name substring to
narrow down a set of test to run.

Usage:
sudo ./test_progs -n 1
sudo ./test_progs -t attach_probe

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: revamp test_progs to allow more control
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:24 +0000 (20:25 -0700)]
selftests/bpf: revamp test_progs to allow more control

Refactor test_progs to allow better control on what's being run.
Also use argp to do argument parsing, so that it's easier to keep adding
more options.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: prevent headers to be compiled as C code
Andrii Nakryiko [Sun, 28 Jul 2019 03:25:23 +0000 (20:25 -0700)]
selftests/bpf: prevent headers to be compiled as C code

Apprently listing header as a normal dependency for a binary output
makes it go through compilation as if it was C code. This currently
works without a problem, but in subsequent commits causes problems for
differently generated test.h for test_progs. Marking those headers as
order-only dependency solves the issue.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoMerge branch 'flow_dissector-input-flags'
Alexei Starovoitov [Fri, 26 Jul 2019 01:00:51 +0000 (18:00 -0700)]
Merge branch 'flow_dissector-input-flags'

Stanislav Fomichev says:

====================
C flow dissector supports input flags that tell it to customize parsing
by either stopping early or trying to parse as deep as possible.
BPF flow dissector always parses as deep as possible which is sub-optimal.
Pass input flags to the BPF flow dissector as well so it can make the same
decisions.

Series outline:
* remove unused FLOW_DISSECTOR_F_STOP_AT_L3 flag
* export FLOW_DISSECTOR_F_XXX flags as uapi and pass them to BPF
  flow dissector
* add documentation for the export flags
* support input flags in BPF_PROG_TEST_RUN via ctx_{in,out}
* sync uapi to tools
* support FLOW_DISSECTOR_F_PARSE_1ST_FRAG in selftest
* support FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL in kernel and selftest
* support FLOW_DISSECTOR_F_STOP_AT_ENCAP in selftest

Pros:
* makes BPF flow dissector faster by avoiding burning extra cycles
* existing BPF progs continue to work by ignoring the flags and always
  parsing as deep as possible

Cons:
* new UAPI which we need to support (OTOH, if we need to deprecate some
  flags, we can just stop setting them upon calling BPF programs)

Some numbers (with .repeat = 4000000 in test_flow_dissector):
        test_flow_dissector:PASS:ipv4-frag 35 nsec
        test_flow_dissector:PASS:ipv4-frag 35 nsec
        test_flow_dissector:PASS:ipv4-no-frag 32 nsec
        test_flow_dissector:PASS:ipv4-no-frag 32 nsec

        test_flow_dissector:PASS:ipv6-frag 39 nsec
        test_flow_dissector:PASS:ipv6-frag 39 nsec
        test_flow_dissector:PASS:ipv6-no-frag 36 nsec
        test_flow_dissector:PASS:ipv6-no-frag 36 nsec

        test_flow_dissector:PASS:ipv6-flow-label 36 nsec
        test_flow_dissector:PASS:ipv6-flow-label 36 nsec
        test_flow_dissector:PASS:ipv6-no-flow-label 33 nsec
        test_flow_dissector:PASS:ipv6-no-flow-label 33 nsec

        test_flow_dissector:PASS:ipip-encap 38 nsec
        test_flow_dissector:PASS:ipip-encap 38 nsec
        test_flow_dissector:PASS:ipip-no-encap 32 nsec
        test_flow_dissector:PASS:ipip-no-encap 32 nsec

The improvement is around 10%, but it's in a tight cache-hot
BPF_PROG_TEST_RUN loop.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: support BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:31 +0000 (15:52 -0700)]
selftests/bpf: support BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP

Exit as soon as we found that packet is encapped when
BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP is passed.
Add appropriate selftest cases.

v2:
* Subtract sizeof(struct iphdr) from .iph_inner.tot_len (Willem de Bruijn)

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf/flow_dissector: support ipv6 flow_label and BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:30 +0000 (15:52 -0700)]
bpf/flow_dissector: support ipv6 flow_label and BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL

Add support for exporting ipv6 flow label via bpf_flow_keys.
Export flow label from bpf_flow.c and also return early when
BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL is passed.

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: support BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:29 +0000 (15:52 -0700)]
selftests/bpf: support BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG

bpf_flow.c: exit early unless BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG is
passed in flags. Also, set ip_proto earlier, this makes sure we have
correct value with fragmented packets.

Add selftest cases to test ipv4/ipv6 fragments and skip eth_get_headlen
tests that don't have BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG flag.

eth_get_headlen calls flow dissector with
BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG flag so we can't run tests that
have different set of input flags against it.

v2:
 * sefltests -> selftests (Willem de Bruijn)
 * Reword a comment about eth_get_headlen flags (Song Liu)

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotools/bpf: sync bpf_flow_keys flags
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:28 +0000 (15:52 -0700)]
tools/bpf: sync bpf_flow_keys flags

Export bpf_flow_keys flags to tools/libbpf/selftests.

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf/flow_dissector: support flags in BPF_PROG_TEST_RUN
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:27 +0000 (15:52 -0700)]
bpf/flow_dissector: support flags in BPF_PROG_TEST_RUN

This will allow us to write tests for those flags.

v2:
* Swap kfree(data) and kfree(user_ctx) (Song Liu)

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf/flow_dissector: document flags
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:26 +0000 (15:52 -0700)]
bpf/flow_dissector: document flags

Describe what each input flag does and who uses it.

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf/flow_dissector: pass input flags to BPF flow dissector program
Stanislav Fomichev [Thu, 25 Jul 2019 22:52:25 +0000 (15:52 -0700)]
bpf/flow_dissector: pass input flags to BPF flow dissector program

C flow dissector supports input flags that tell it to customize parsing
by either stopping early or trying to parse as deep as possible. Pass
those flags to the BPF flow dissector so it can make the same
decisions. In the next commits I'll add support for those flags to
our reference bpf_flow.c

v3:
* Export copy of flow dissector flags instead of moving (Alexei Starovoitov)

Acked-by: Petar Penkov <ppenkov@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Petar Penkov <ppenkov@google.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: Add selftests for bpf_perf_event_output
Allan Zhang [Wed, 24 Jul 2019 00:07:25 +0000 (17:07 -0700)]
selftests/bpf: Add selftests for bpf_perf_event_output

Software event output is only enabled by a few prog types.
This test is to ensure that all supported types are enabled for
bpf_perf_event_output successfully.

Signed-off-by: Allan Zhang <allanzhang@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agobpf: Allow bpf_skb_event_output for a few prog types
Allan Zhang [Wed, 24 Jul 2019 00:07:24 +0000 (17:07 -0700)]
bpf: Allow bpf_skb_event_output for a few prog types

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>
5 years agoMerge branch 'convert-tests-to-libbpf'
Alexei Starovoitov [Tue, 23 Jul 2019 23:05:53 +0000 (16:05 -0700)]
Merge branch 'convert-tests-to-libbpf'

Andrii Nakryiko says:

====================
There were few more tests and samples that were using custom perf buffer setup
code from trace_helpers.h. This patch set gets rid of all the usages of those
and removes helpers themselves. Libbpf provides nicer, but equally powerful
set of APIs to work with perf ring buffers, so let's have all the samples use

v1->v2:
- make logging message one long line instead of two (Song).
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: remove perf buffer helpers
Andrii Nakryiko [Tue, 23 Jul 2019 21:34:45 +0000 (14:34 -0700)]
selftests/bpf: remove perf buffer helpers

libbpf's perf_buffer API supersedes trace_helper.h's helpers.
Remove those helpers after all existing users were already moved to
perf_buffer API.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agosamples/bpf: switch trace_output sample to perf_buffer API
Andrii Nakryiko [Tue, 23 Jul 2019 21:34:44 +0000 (14:34 -0700)]
samples/bpf: switch trace_output sample to perf_buffer API

Convert trace_output sample to libbpf's perf_buffer API.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agosamples/bpf: convert xdp_sample_pkts_user to perf_buffer API
Andrii Nakryiko [Tue, 23 Jul 2019 21:34:43 +0000 (14:34 -0700)]
samples/bpf: convert xdp_sample_pkts_user to perf_buffer API

Convert xdp_sample_pkts_user to libbpf's perf_buffer API.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: switch test_tcpnotify to perf_buffer API
Andrii Nakryiko [Tue, 23 Jul 2019 21:34:42 +0000 (14:34 -0700)]
selftests/bpf: switch test_tcpnotify to perf_buffer API

Switch test_tcpnotify test to use libbpf's perf_buffer API instead of
re-implementing portion of it.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests/bpf: convert test_get_stack_raw_tp to perf_buffer API
Andrii Nakryiko [Tue, 23 Jul 2019 21:34:41 +0000 (14:34 -0700)]
selftests/bpf: convert test_get_stack_raw_tp to perf_buffer API

Convert test_get_stack_raw_tp test to new perf_buffer API.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agolibbpf: provide more helpful message on uninitialized global var
Andrii Nakryiko [Tue, 23 Jul 2019 21:11:33 +0000 (14:11 -0700)]
libbpf: provide more helpful message on uninitialized global var

When BPF program defines uninitialized global variable, it's put into
a special COMMON section. Libbpf will reject such programs, but will
provide very unhelpful message with garbage-looking section index.

This patch detects special section cases and gives more explicit error
message.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agotc-testing: added tdc tests for [b|p]fifo qdisc
Roman Mashak [Tue, 23 Jul 2019 19:01:59 +0000 (15:01 -0400)]
tc-testing: added tdc tests for [b|p]fifo qdisc

Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agohv_sock: Use consistent types for UUIDs
Andy Shevchenko [Tue, 23 Jul 2019 16:39:43 +0000 (19:39 +0300)]
hv_sock: Use consistent types for UUIDs

The rest of Hyper-V code is using new types for UUID handling.
Convert hv_sock as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'nfp-Offload-MPLS-actions'
David S. Miller [Tue, 23 Jul 2019 20:52:51 +0000 (13:52 -0700)]
Merge branch 'nfp-Offload-MPLS-actions'

John Hurley says:

====================
nfp: Offload MPLS actions

The module act_mpls has recently been added to the kernel. This allows the
manipulation of MPLS headers on packets including push, pop and modify.
Add these new actions and parameters to the intermediate representation
API for hardware offload. Follow this by implementing the offload of these
MPLS actions in the NFP driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonfp: flower: offload MPLS set action
John Hurley [Tue, 23 Jul 2019 14:34:02 +0000 (15:34 +0100)]
nfp: flower: offload MPLS set action

Recent additions to the kernel include a TC action module to manipulate
MPLS headers on packets. Such actions are available to offload via the
flow_offload intermediate representation API.

Modify the NFP driver to allow the offload of MPLS set actions to
firmware. Set actions update the outermost MPLS header. The offload
includes a mask to specify which fields should be set.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonfp: flower: offload MPLS pop action
John Hurley [Tue, 23 Jul 2019 14:34:01 +0000 (15:34 +0100)]
nfp: flower: offload MPLS pop action

Recent additions to the kernel include a TC action module to manipulate
MPLS headers on packets. Such actions are available to offload via the
flow_offload intermediate representation API.

Modify the NFP driver to allow the offload of MPLS pop actions to
firmware. The act_mpls TC module enforces that the next protocol is
supplied along with the pop action. Passing this to firmware allows it
to properly rebuild the underlying packet after the pop.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonfp: flower: offload MPLS push action
John Hurley [Tue, 23 Jul 2019 14:34:00 +0000 (15:34 +0100)]
nfp: flower: offload MPLS push action

Recent additions to the kernel include a TC action module to manipulate
MPLS headers on packets. Such actions are available to offload via the
flow_offload intermediate representation API.

Modify the NFP driver to allow the offload of MPLS push actions to
firmware.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: sched: include mpls actions in hardware intermediate representation
John Hurley [Tue, 23 Jul 2019 14:33:59 +0000 (15:33 +0100)]
net: sched: include mpls actions in hardware intermediate representation

A recent addition to TC actions is the ability to manipulate the MPLS
headers on packets.

In preparation to offload such actions to hardware, update the IR code to
accept and prepare the new actions.

Note that no driver currently impliments the MPLS dec_ttl action so this
is not included.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet/mlx5e: xsk: dynamically allocate mlx5e_channel_param
Arnd Bergmann [Tue, 23 Jul 2019 12:02:26 +0000 (12:02 +0000)]
net/mlx5e: xsk: dynamically allocate mlx5e_channel_param

The structure is too large to put on the stack, resulting in a
warning on 32-bit ARM:

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c:59:5: error: stack frame size of 1344 bytes in function
      'mlx5e_open_xsk' [-Werror,-Wframe-larger-than=]

Use kvzalloc() instead.

Fixes: a038e9794541 ("net/mlx5e: Add XSK zero-copy support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: jme: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 14:16:42 +0000 (22:16 +0800)]
net: jme: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoigb: Use dev_get_drvdata where possible
Chuhong Yuan [Tue, 23 Jul 2019 14:16:24 +0000 (22:16 +0800)]
igb: Use dev_get_drvdata where possible

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoi40e: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 14:15:51 +0000 (22:15 +0800)]
i40e: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agofm10k: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 14:15:33 +0000 (22:15 +0800)]
fm10k: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoe1000e: Use dev_get_drvdata where possible
Chuhong Yuan [Tue, 23 Jul 2019 14:15:13 +0000 (22:15 +0800)]
e1000e: Use dev_get_drvdata where possible

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: broadcom: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 13:19:29 +0000 (21:19 +0800)]
net: broadcom: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: atheros: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 13:18:56 +0000 (21:18 +0800)]
net: atheros: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: 3com: 3c59x: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 13:18:44 +0000 (21:18 +0800)]
net: 3com: 3c59x: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoatm: Use dev_get_drvdata
Chuhong Yuan [Tue, 23 Jul 2019 08:13:14 +0000 (16:13 +0800)]
atm: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoftgmac100: Fix build.
David S. Miller [Tue, 23 Jul 2019 18:45:44 +0000 (11:45 -0700)]
ftgmac100: Fix build.

drivers/net/ethernet/faraday/ftgmac100.c:777:13: error: 'skb_frag_t {aka struct bio_vec}' has no member named 'size'

Fallout from the skb_frag_t conversion to bio_vec, simply
use skb_frag_size().

Fixes: b8b576a16f79 ("net: Rename skb_frag_t size to bv_len")
Reported-by: René van Dorst <opensource@vdorst.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoqlge: Move drivers/net/ethernet/qlogic/qlge/ to drivers/staging/qlge/
Benjamin Poirier [Tue, 23 Jul 2019 06:14:13 +0000 (15:14 +0900)]
qlge: Move drivers/net/ethernet/qlogic/qlge/ to drivers/staging/qlge/

The hardware has been declared EOL by the vendor more than 5 years ago.
What's more relevant to the Linux kernel is that the quality of this driver
is not on par with many other mainline drivers.

Cc: Manish Chopra <manishc@marvell.com>
Message-id: <20190617074858.32467-1-bpoirier@suse.com>
Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'Convert-skb_frag_t-to-bio_vec'
David S. Miller [Tue, 23 Jul 2019 03:47:56 +0000 (20:47 -0700)]
Merge branch 'Convert-skb_frag_t-to-bio_vec'

Matthew Wilcox says:

====================
Convert skb_frag_t to bio_vec

The skb_frag_t and bio_vec are fundamentally the same (page, offset,
length) tuple.  This patch series unifies the two, leaving the
skb_frag_t typedef in place.  This has the immediate advantage that
we already have iov_iter support for bvecs and don't need to add
support for iterating skbuffs.  It enables a long-term plan to use
bvecs more broadly within the kernel and should make network-storage
drivers able to do less work converting between skbuffs and biovecs.

It will consume more memory on 32-bit kernels.  If that proves
problematic, we can look at ways of addressing it.

v3: Rebase on latest Linus with net-next merged.
  - Reorder the uncontroversial 'Use skb accessors' patches first so you
    can apply just those two if you want to hold off on the full
    conversion.
  - Convert all the users of 'struct skb_frag_struct' to skb_frag_t.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Convert skb_frag_t to bio_vec
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:31 +0000 (20:08 -0700)]
net: Convert skb_frag_t to bio_vec

There are a lot of users of frag->page_offset, so use a union
to avoid converting those users today.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Rename skb_frag_t size to bv_len
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:30 +0000 (20:08 -0700)]
net: Rename skb_frag_t size to bv_len

Improved compatibility with bvec

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Rename skb_frag page to bv_page
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:29 +0000 (20:08 -0700)]
net: Rename skb_frag page to bv_page

One step closer to turning the skb_frag_t into a bio_vec.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Reorder the contents of skb_frag_t
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:28 +0000 (20:08 -0700)]
net: Reorder the contents of skb_frag_t

Match the layout of bio_vec.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Increase the size of skb_frag_t
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:27 +0000 (20:08 -0700)]
net: Increase the size of skb_frag_t

To increase commonality between block and net, we are going to replace
the skb_frag_t with the bio_vec.  This patch increases the size of
skb_frag_t on 32-bit machines from 8 bytes to 12 bytes.  The size is
unchanged on 64-bit machines.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Use skb accessors in network core
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:26 +0000 (20:08 -0700)]
net: Use skb accessors in network core

In preparation for unifying the skb_frag and bio_vec, use the fine
accessors which already exist and use skb_frag_t instead of
struct skb_frag_struct.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: Use skb accessors in network drivers
Matthew Wilcox (Oracle) [Tue, 23 Jul 2019 03:08:25 +0000 (20:08 -0700)]
net: Use skb accessors in network drivers

In preparation for unifying the skb_frag and bio_vec, use the fine
accessors which already exist and use skb_frag_t instead of
struct skb_frag_struct.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: usb: Merge cpu_to_le32s + memcpy to put_unaligned_le32
Chuhong Yuan [Mon, 22 Jul 2019 07:41:34 +0000 (15:41 +0800)]
net: usb: Merge cpu_to_le32s + memcpy to put_unaligned_le32

Merge the combo uses of cpu_to_le32s and memcpy.
Use put_unaligned_le32 instead.
This simplifies the code.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agor8169: improve rtl_rx
Heiner Kallweit [Mon, 22 Jul 2019 20:01:15 +0000 (22:01 +0200)]
r8169: improve rtl_rx

This patch improves few aspects of rtl_rx, no functional change intended.

1. inline rtl8169_try_rx_copy
2. make pkt_size unsigned
3. use constant ETH_FCS_LEN instead of value 4
4. We just created the skb, so we don't need the checks in skb_put.
   Also we don't need the return value of skb_put.
   Set skb->tail and skb->len directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoax88179_178a: Merge memcpy + le32_to_cpus to get_unaligned_le32
Chuhong Yuan [Fri, 19 Jul 2019 09:07:15 +0000 (17:07 +0800)]
ax88179_178a: Merge memcpy + le32_to_cpus to get_unaligned_le32

Merge the combo use of memcpy and le32_to_cpus.
Use get_unaligned_le32 instead.
This simplifies the code.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agousbnet: smsc75xx: Merge memcpy + le32_to_cpus to get_unaligned_le32
Chuhong Yuan [Fri, 19 Jul 2019 08:27:31 +0000 (16:27 +0800)]
usbnet: smsc75xx: Merge memcpy + le32_to_cpus to get_unaligned_le32

Merge the combo use of memcpy and le32_to_cpus.
Use get_unaligned_le32 instead.
This simplifies the code.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: lan78xx: Merge memcpy + lexx_to_cpus to get_unaligned_lexx
Chuhong Yuan [Fri, 19 Jul 2019 07:36:15 +0000 (15:36 +0800)]
net: lan78xx: Merge memcpy + lexx_to_cpus to get_unaligned_lexx

Merge the combo use of memcpy and lexx_to_cpus.
Use get_unaligned_lexx instead.
This simplifies the code.

Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Acked-by: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet-ipv6-ndisc: add support for RFC7710 RA Captive Portal Identifier
Maciej Żenczykowski [Fri, 19 Jul 2019 06:30:03 +0000 (23:30 -0700)]
net-ipv6-ndisc: add support for RFC7710 RA Captive Portal Identifier

This is trivial since we already have support for the entirely
identical (from the kernel's point of view) RDNSS and DNSSL that
also contain opaque data that needs to be passed down to userspace.

As specified in RFC7710, Captive Portal option contains a URL.
8-bit identifier of the option type as assigned by the IANA is 37.
This option should also be treated as userland.

Hence, treat ND option 37 as userland (Captive Portal support)

See:
  https://tools.ietf.org/html/rfc7710
  https://www.iana.org/assignments/icmpv6-parameters/icmpv6-parameters.xhtml

Fixes: e35f30c131a56
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: Remin Nguyen Van <reminv@google.com>
Cc: Alexey I. Froloff <raorn@raorn.name>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Mon, 22 Jul 2019 16:30:34 +0000 (09:30 -0700)]
Merge branch 'sched-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull preemption Kconfig fix from Thomas Gleixner:
 "The PREEMPT_RT stub config renamed PREEMPT to PREEMPT_LL and defined
  PREEMPT outside of the menu and made it selectable by both PREEMPT_LL
  and PREEMPT_RT.

  Stupid me missed that 114 defconfigs select CONFIG_PREEMPT which
  obviously can't work anymore. oldconfig builds are affected as well,
  but it's more obvious as the user gets asked. [old]defconfig silently
  fixes it up and selects PREEMPT_NONE.

  Unbreak it by undoing the rename and adding a intermediate config
  symbol which is selected by both PREEMPT and PREEMPT_RT. That requires
  to chase down a few #ifdefs, but it's better than tweaking 114
  defconfigs and annoying users"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/rt, Kconfig: Unbreak def/oldconfig with CONFIG_PREEMPT=y

5 years agoMerge tag 'for-linus-20190722' of git://git.kernel.org/pub/scm/linux/kernel/git/braun...
Linus Torvalds [Mon, 22 Jul 2019 16:14:19 +0000 (09:14 -0700)]
Merge tag 'for-linus-20190722' of git://git./linux/kernel/git/brauner/linux

Pull pidfd polling fix from Christian Brauner:
 "A fix for pidfd polling. It ensures that the task's exit state is
  visible to all waiters"

* tag 'for-linus-20190722' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  pidfd: fix a poll race when setting exit_state