Alexei Starovoitov [Wed, 3 Apr 2024 17:29:56 +0000 (10:29 -0700)]
Merge branch 'add-internal-only-bpf-per-cpu-instruction'
Andrii Nakryiko says:
====================
Add internal-only BPF per-CPU instruction
Add a new BPF instruction for resolving per-CPU memory addresses.
New instruction is a special form of BPF_ALU64 | BPF_MOV | BPF_X, with
insns->off set to BPF_ADDR_PERCPU (== -1). It resolves provided per-CPU offset
to an absolute address where per-CPU data resides for "this" CPU.
This patch set implements support for it in x86-64 BPF JIT only.
Using the new instruction, we also implement inlining for three cases:
- bpf_get_smp_processor_id(), which allows to avoid unnecessary trivial
function call, saving a bit of performance and also not polluting LBR
records with unnecessary function call/return records;
- PERCPU_ARRAY's bpf_map_lookup_elem() is completely inlined, bringing its
performance to implementing per-CPU data structures using global variables
in BPF (which is an awesome improvement, see benchmarks below);
- PERCPU_HASH's bpf_map_lookup_elem() is partially inlined, just like the
same for non-PERCPU HASH map; this still saves a bit of overhead.
To validate performance benefits, I hacked together a tiny benchmark doing
only bpf_map_lookup_elem() and incrementing the value by 1 for PERCPU_ARRAY
(arr-inc benchmark below) and PERCPU_HASH (hash-inc benchmark below) maps. To
establish a baseline, I also implemented logic similar to PERCPU_ARRAY based
on global variable array using bpf_get_smp_processor_id() to index array for
current CPU (glob-arr-inc benchmark below).
BEFORE
======
glob-arr-inc : 163.685 ± 0.092M/s
arr-inc : 138.096 ± 0.160M/s
hash-inc : 66.855 ± 0.123M/s
AFTER
=====
glob-arr-inc : 173.921 ± 0.039M/s (+6%)
arr-inc : 170.729 ± 0.210M/s (+23.7%)
hash-inc : 68.673 ± 0.070M/s (+2.7%)
As can be seen, PERCPU_HASH gets a modest +2.7% improvement, while global
array-based gets a nice +6% due to inlining of bpf_get_smp_processor_id().
But what's really important is that arr-inc benchmark basically catches up
with glob-arr-inc, resulting in +23.7% improvement. This means that in
practice it won't be necessary to avoid PERCPU_ARRAY anymore if performance is
critical (e.g., high-frequent stats collection, which is often a practical use
for PERCPU_ARRAY today).
v1->v2:
- use BPF_ALU64 | BPF_MOV instruction instead of LDX (Alexei);
- dropped the direct per-CPU memory read instruction, it can always be added
back, if necessary;
- guarded bpf_get_smp_processor_id() behind x86-64 check (Alexei);
- switched all per-cpu addr casts to (unsigned long) to avoid sparse
warnings.
====================
Link: https://lore.kernel.org/r/20240402021307.1012571-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 2 Apr 2024 02:13:05 +0000 (19:13 -0700)]
bpf: inline bpf_map_lookup_elem() helper for PERCPU_HASH map
Using new per-CPU BPF instruction, partially inline
bpf_map_lookup_elem() helper for per-CPU hashmap BPF map. Just like for
normal HASH map, we still generate a call into __htab_map_lookup_elem(),
but after that we resolve per-CPU element address using a new
instruction, saving on extra functions calls.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20240402021307.1012571-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 2 Apr 2024 02:13:04 +0000 (19:13 -0700)]
bpf: inline bpf_map_lookup_elem() for PERCPU_ARRAY maps
Using new per-CPU BPF instruction implement inlining for per-CPU ARRAY
map lookup helper, if BPF JIT support is present.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20240402021307.1012571-4-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 2 Apr 2024 02:13:03 +0000 (19:13 -0700)]
bpf: inline bpf_get_smp_processor_id() helper
If BPF JIT supports per-CPU MOV instruction, inline bpf_get_smp_processor_id()
to eliminate unnecessary function calls.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20240402021307.1012571-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 2 Apr 2024 02:13:02 +0000 (19:13 -0700)]
bpf: add special internal-only MOV instruction to resolve per-CPU addrs
Add a new BPF instruction for resolving absolute addresses of per-CPU
data from their per-CPU offsets. This instruction is internal-only and
users are not allowed to use them directly. They will only be used for
internal inlining optimizations for now between BPF verifier and BPF JITs.
We use a special BPF_MOV | BPF_ALU64 | BPF_X form with insn->off field
set to BPF_ADDR_PERCPU = -1. I used negative offset value to distinguish
them from positive ones used by user-exposed instructions.
Such instruction performs a resolution of a per-CPU offset stored in
a register to a valid kernel address which can be dereferenced. It is
useful in any use case where absolute address of a per-CPU data has to
be resolved (e.g., in inlining bpf_map_lookup_elem()).
BPF disassembler is also taught to recognize them to support dumping
final BPF assembly code (non-JIT'ed version).
Add arch-specific way for BPF JITs to mark support for this instructions.
This patch also adds support for these instructions in x86-64 BPF JIT.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/r/20240402021307.1012571-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Justin Stitt [Tue, 2 Apr 2024 23:52:50 +0000 (23:52 +0000)]
bpf: Replace deprecated strncpy with strscpy
strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
bpf sym names get looked up and compared/cleaned with various string
apis. This suggests they need to be NUL-terminated (strncpy() suggests
this but does not guarantee it).
| static int compare_symbol_name(const char *name, char *namebuf)
| {
| cleanup_symbol_name(namebuf);
| return strcmp(name, namebuf);
| }
| static void cleanup_symbol_name(char *s)
| {
| ...
| res = strstr(s, ".llvm.");
| ...
| }
Use strscpy() as this method guarantees NUL-termination on the
destination buffer.
This patch also replaces two uses of strncpy() used in log.c. These are
simple replacements as postfix has been zero-initialized on the stack
and has source arguments with a size less than the destination's size.
Note that this patch uses the new 2-argument version of strscpy
introduced in commit
e6584c3964f2f ("string: Allow 2-argument strscpy()").
Signed-off-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
Link: https://github.com/KSPP/linux/issues/90
Link: https://lore.kernel.org/bpf/20240402-strncpy-kernel-bpf-core-c-v1-1-7cb07a426e78@google.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:29 +0000 (11:45 +0000)]
selftests/xsk: Add new test case for AF_XDP under max ring sizes
Introduce a test case to evaluate AF_XDP's robustness by pushing hardware
and software ring sizes to their limits. This test ensures AF_XDP's
reliability amidst potential producer/consumer throttling due to maximum
ring utilization. The testing strategy includes:
1. Configuring rings to their maximum allowable sizes.
2. Executing a series of tests across diverse batch sizes to assess
system's behavior under different configurations.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-8-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:28 +0000 (11:45 +0000)]
selftests/xsk: Test AF_XDP functionality under minimal ring configurations
Add a new test case that stresses AF_XDP and the driver by configuring
small hardware and software ring sizes. This verifies that AF_XDP continues
to function properly even with insufficient ring space that could lead
to frequent producer/consumer throttling. The test procedure involves:
1. Set the minimum possible ring configuration(tx 64 and rx 128).
2. Run tests with various batch sizes(1 and 63) to validate the system's
behavior under different configurations.
Update Makefile to include network_helpers.o in the build process for
xskxceiver.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-7-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:27 +0000 (11:45 +0000)]
selftests/xsk: Introduce set_ring_size function with a retry mechanism for handling AF_XDP socket closures
Introduce a new function, set_ring_size(), to manage asynchronous AF_XDP
socket closure. Retry set_hw_ring_size up to SOCK_RECONF_CTR times if it
fails due to an active AF_XDP socket. Return an error immediately for
non-EBUSY errors. This enhances robustness against asynchronous AF_XDP
socket closures during ring size changes.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-6-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:26 +0000 (11:45 +0000)]
selftests/bpf: Implement set_hw_ring_size function to configure interface ring size
Introduce a new function called set_hw_ring_size that allows for the
dynamic configuration of the ring size within the interface.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-5-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:25 +0000 (11:45 +0000)]
selftests/bpf: Implement get_hw_ring_size function to retrieve current and max interface size
Introduce a new function called get_hw_size that retrieves both the
current and maximum size of the interface and stores this information
in the 'ethtool_ringparam' structure.
Remove ethtool_channels struct from xdp_hw_metadata.c due to redefinition
error. Remove unused linux/if.h include from flow_dissector BPF test to
address CI pipeline failure.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-4-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:24 +0000 (11:45 +0000)]
selftests/xsk: Make batch size variable
Convert the constant BATCH_SIZE into a variable named batch_size to allow
dynamic modification at runtime. This is required for the forthcoming
changes to support testing different hardware ring sizes.
While running these tests, a bug was identified when the batch size is
roughly the same as the NIC ring size. This has now been addressed by
Maciej's fix in commit
913eda2b08cc ("i40e: xsk: remove count_mask").
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-3-tushar.vyavahare@intel.com
Tushar Vyavahare [Tue, 2 Apr 2024 11:45:23 +0000 (11:45 +0000)]
tools: Add ethtool.h header to tooling infra
This commit duplicates the ethtool.h file from the include/uapi/linux
directory in the kernel source to the tools/include/uapi/linux directory.
This action ensures that the ethtool.h file used in the tools directory
is in sync with the kernel's version, maintaining consistency across the
codebase.
There are some checkpatch warnings in this file that could be cleaned up,
but I preferred to move it over as-is for now to avoid disrupting the code.
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20240402114529.545475-2-tushar.vyavahare@intel.com
Alexei Starovoitov [Wed, 3 Apr 2024 02:45:50 +0000 (19:45 -0700)]
Merge branch 'bpf-arm64-add-support-for-bpf-arena'
Puranjay Mohan says:
====================
bpf,arm64: Add support for BPF Arena
Changes in V4
V3: https://lore.kernel.org/bpf/
20240323103057.26499-1-puranjay12@gmail.com/
- Use more descriptive variable names.
- Use insn_is_cast_user() helper.
Changes in V3
V2: https://lore.kernel.org/bpf/
20240321153102.103832-1-puranjay12@gmail.com/
- Optimize bpf_addr_space_cast as suggested by Xu Kuohai
Changes in V2
V1: https://lore.kernel.org/bpf/
20240314150003.123020-1-puranjay12@gmail.com/
- Fix build warnings by using 5 in place of 32 as DONT_CLEAR marker.
R5 is not mapped to any BPF register so it can safely be used here.
This series adds the support for PROBE_MEM32 and bpf_addr_space_cast
instructions to the ARM64 BPF JIT. These two instructions allow the
enablement of BPF Arena.
All arena related selftests are passing.
[root@ip-172-31-6-62 bpf]# ./test_progs -a "*arena*"
#3/1 arena_htab/arena_htab_llvm:OK
#3/2 arena_htab/arena_htab_asm:OK
#3 arena_htab:OK
#4/1 arena_list/arena_list_1:OK
#4/2 arena_list/arena_list_1000:OK
#4 arena_list:OK
#434/1 verifier_arena/basic_alloc1:OK
#434/2 verifier_arena/basic_alloc2:OK
#434/3 verifier_arena/basic_alloc3:OK
#434/4 verifier_arena/iter_maps1:OK
#434/5 verifier_arena/iter_maps2:OK
#434/6 verifier_arena/iter_maps3:OK
#434 verifier_arena:OK
Summary: 3/10 PASSED, 0 SKIPPED, 0 FAILED
This will need the patch [1] that introduced insn_is_cast_user() helper to
build.
The verifier_arena selftest could fail in the CI because the following
commit[2] is missing from bpf-next:
[1] https://lore.kernel.org/bpf/
20240324183226.29674-1-puranjay12@gmail.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=
fa3550dca8f02ec312727653a94115ef3ab68445
Here is a CI run with all dependencies added: https://github.com/kernel-patches/bpf/pull/6641
====================
Link: https://lore.kernel.org/r/20240325150716.4387-1-puranjay12@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Puranjay Mohan [Mon, 25 Mar 2024 15:07:16 +0000 (15:07 +0000)]
bpf: Add arm64 JIT support for bpf_addr_space_cast instruction.
LLVM generates bpf_addr_space_cast instruction while translating
pointers between native (zero) address space and
__attribute__((address_space(N))). The addr_space=0 is reserved as
bpf_arena address space.
rY = addr_space_cast(rX, 0, 1) is processed by the verifier and
converted to normal 32-bit move: wX = wY.
rY = addr_space_cast(rX, 1, 0) : used to convert a bpf arena pointer to
a pointer in the userspace vma. This has to be converted by the JIT.
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20240325150716.4387-3-puranjay12@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Puranjay Mohan [Mon, 25 Mar 2024 15:07:15 +0000 (15:07 +0000)]
bpf: Add arm64 JIT support for PROBE_MEM32 pseudo instructions.
Add support for [LDX | STX | ST], PROBE_MEM32, [B | H | W | DW]
instructions. They are similar to PROBE_MEM instructions with the
following differences:
- PROBE_MEM32 supports store.
- PROBE_MEM32 relies on the verifier to clear upper 32-bit of the
src/dst register
- PROBE_MEM32 adds 64-bit kern_vm_start address (which is stored in R28
in the prologue). Due to bpf_arena constructions such R28 + reg +
off16 access is guaranteed to be within arena virtual range, so no
address check at run-time.
- PROBE_MEM32 allows STX and ST. If they fault the store is a nop. When
LDX faults the destination register is zeroed.
To support these on arm64, we do tmp2 = R28 + src/dst reg and then use
tmp2 as the new src/dst register. This allows us to reuse most of the
code for normal [LDX | STX | ST].
Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Link: https://lore.kernel.org/r/20240325150716.4387-2-puranjay12@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Geliang Tang [Tue, 2 Apr 2024 10:50:21 +0000 (18:50 +0800)]
selftests/bpf: Add pid limit for mptcpify prog
In order to prevent mptcpify prog from affecting the running results
of other BPF tests, a pid limit was added to restrict it from only
modifying its own program.
Suggested-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/8987e2938e15e8ec390b85b5dcbee704751359dc.1712054986.git.tanggeliang@kylinos.cn
Tobias Böhm [Tue, 2 Apr 2024 15:10:52 +0000 (17:10 +0200)]
libbpf: Use local bpf_helpers.h include
Commit
20d59ee55172fdf6 ("libbpf: add bpf_core_cast() macro") added a
bpf_helpers include in bpf_core_read.h as a system include. Usually, the
includes are local, though, like in bpf_tracing.h. This commit adjusts
the include to be local as well.
Signed-off-by: Tobias Böhm <tobias@aibor.de>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/q5d5bgc6vty2fmaazd5e73efd6f5bhiru2le6fxn43vkw45bls@fhlw2s5ootdb
Jose Fernandez [Tue, 2 Apr 2024 03:40:10 +0000 (21:40 -0600)]
bpf: Improve program stats run-time calculation
This patch improves the run-time calculation for program stats by
capturing the duration as soon as possible after the program returns.
Previously, the duration included u64_stats_t operations. While the
instrumentation overhead is part of the total time spent when stats are
enabled, distinguishing between the program's native execution time and
the time spent due to instrumentation is crucial for accurate
performance analysis.
By making this change, the patch facilitates more precise optimization
of BPF programs, enabling users to understand their performance in
environments without stats enabled.
I used a virtualized environment to measure the run-time over one minute
for a basic raw_tracepoint/sys_enter program, which just increments a
local counter. Although the virtualization introduced some performance
degradation that could affect the results, I observed approximately a
16% decrease in average run-time reported by stats with this change
(310 -> 260 nsec).
Signed-off-by: Jose Fernandez <josef@netflix.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240402034010.25060-1-josef@netflix.com
Pu Lehui [Tue, 2 Apr 2024 07:30:29 +0000 (07:30 +0000)]
selftests/bpf: Skip test when perf_event_open returns EOPNOTSUPP
When testing send_signal and stacktrace_build_id_nmi using the riscv sbi
pmu driver without the sscofpmf extension or the riscv legacy pmu driver,
then failures as follows are encountered:
test_send_signal_common:FAIL:perf_event_open unexpected perf_event_open: actual -1 < expected 0
#272/3 send_signal/send_signal_nmi:FAIL
test_stacktrace_build_id_nmi:FAIL:perf_event_open err -1 errno 95
#304 stacktrace_build_id_nmi:FAIL
The reason is that the above pmu driver or hardware does not support
sampling events, that is, PERF_PMU_CAP_NO_INTERRUPT is set to pmu
capabilities, and then perf_event_open returns EOPNOTSUPP. Since
PERF_PMU_CAP_NO_INTERRUPT is not only set in the riscv-related pmu driver,
it is better to skip testing when this capability is set.
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240402073029.1299085-1-pulehui@huaweicloud.com
Andrii Nakryiko [Mon, 1 Apr 2024 17:07:13 +0000 (10:07 -0700)]
bpftool: Use __typeof__() instead of typeof() in BPF skeleton
When generated BPF skeleton header is included in C++ code base, some
compiler setups will emit warning about using language extensions due to
typeof() usage, resulting in something like:
error: extension used [-Werror,-Wlanguage-extension-token]
obj->struct_ops.empty_tcp_ca = (typeof(obj->struct_ops.empty_tcp_ca))
^
It looks like __typeof__() is a preferred way to do typeof() with better
C++ compatibility behavior, so switch to that. With __typeof__() we get
no such warning.
Fixes: c2a0257c1edf ("bpftool: Cast pointers for shadow types explicitly.")
Fixes: 00389c58ffe9 ("bpftool: Add support for subskeletons")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Kui-Feng Lee <thinker.li@gmail.com>
Acked-by: Quentin Monnet <qmo@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240401170713.2081368-1-andrii@kernel.org
Yonghong Song [Tue, 2 Apr 2024 02:54:46 +0000 (19:54 -0700)]
selftests/bpf: Using llvm may_goto inline asm for cond_break macro
Currently, cond_break macro uses bytes to encode the may_goto insn.
Patch [1] in llvm implemented may_goto insn in BPF backend.
Replace byte-level encoding with llvm inline asm for better usability.
Using llvm may_goto insn is controlled by macro __BPF_FEATURE_MAY_GOTO.
[1] https://github.com/llvm/llvm-project/commit/
0e0bfacff71859d1f9212205f8f873d47029d3fb
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240402025446.3215182-1-yonghong.song@linux.dev
Anton Protopopov [Tue, 2 Apr 2024 07:33:47 +0000 (07:33 +0000)]
bpf: Add a verbose message if map limit is reached
When more than 64 maps are used by a program and its subprograms the
verifier returns -E2BIG. Add a verbose message which highlights the
source of the error and also print the actual limit.
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240402073347.195920-1-aspsk@isovalent.com
David Lechner [Fri, 29 Mar 2024 15:28:46 +0000 (10:28 -0500)]
bpf: Fix typo in uapi doc comments
In a few places in the bpf uapi headers, EOPNOTSUPP is missing a "P" in
the doc comments. This adds the missing "P".
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240329152900.398260-2-dlechner@baylibre.com
Rameez Rehman [Sun, 31 Mar 2024 20:03:46 +0000 (21:03 +0100)]
bpftool: Clean-up typos, punctuation, list formatting in docs
Improve the formatting of the attach flags for cgroup programs in the
relevant man page, and fix typos ("can be on of", "an userspace inet
socket") when introducing that list. Also fix a couple of other trivial
issues in docs.
[ Quentin: Fixed trival issues in bpftool-gen.rst and bpftool-iter.rst ]
Signed-off-by: Rameez Rehman <rameezrehman408@hotmail.com>
Signed-off-by: Quentin Monnet <qmo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240331200346.29118-4-qmo@kernel.org
Rameez Rehman [Sun, 31 Mar 2024 20:03:45 +0000 (21:03 +0100)]
bpftool: Remove useless emphasis on command description in man pages
As it turns out, the terms in definition lists in the rST file are
already rendered with bold-ish formatting when generating the man pages;
all double-star sequences we have in the commands for the command
description are unnecessary, and can be removed to make the
documentation easier to read.
The rST files were automatically processed with:
sed -i '/DESCRIPTION/,/OPTIONS/ { /^\*/ s/\*\*//g }' b*.rst
Signed-off-by: Rameez Rehman <rameezrehman408@hotmail.com>
Signed-off-by: Quentin Monnet <qmo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240331200346.29118-3-qmo@kernel.org
Rameez Rehman [Sun, 31 Mar 2024 20:03:44 +0000 (21:03 +0100)]
bpftool: Use simpler indentation in source rST for documentation
The rST manual pages for bpftool would use a mix of tabs and spaces for
indentation. While this is the norm in C code, this is rather unusual
for rST documents, and over time we've seen many contributors use a
wrong level of indentation for documentation update.
Let's fix bpftool's indentation in docs once and for all:
- Let's use spaces, that are more common in rST files.
- Remove one level of indentation for the synopsis, the command
description, and the "see also" section. As a result, all sections
start with the same indentation level in the generated man page.
- Rewrap the paragraphs after the changes.
There is no content change in this patch, only indentation and
rewrapping changes. The wrapping in the generated source files for the
manual pages is changed, but the pages displayed with "man" remain the
same, apart from the adjusted indentation level on relevant sections.
[ Quentin: rebased on bpf-next, removed indent level for command
description and options, updated synopsis, command summary, and "see
also" sections. ]
Signed-off-by: Rameez Rehman <rameezrehman408@hotmail.com>
Signed-off-by: Quentin Monnet <qmo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240331200346.29118-2-qmo@kernel.org
Andrii Nakryiko [Fri, 29 Mar 2024 19:04:10 +0000 (12:04 -0700)]
selftests/bpf: make multi-uprobe tests work in RELEASE=1 mode
When BPF selftests are built in RELEASE=1 mode with -O2 optimization
level, uprobe_multi binary, called from multi-uprobe tests is optimized
to the point that all the thousands of target uprobe_multi_func_XXX
functions are eliminated, breaking tests.
So ensure they are preserved by using weak attribute.
But, actually, compiling uprobe_multi binary with -O2 takes a really
long time, and is quite useless (it's not a benchmark). So in addition
to ensuring that uprobe_multi_func_XXX functions are preserved, opt-out
of -O2 explicitly in Makefile and stick to -O0. This saves a lot of
compilation time.
With -O2, just recompiling uprobe_multi:
$ touch uprobe_multi.c
$ time make RELEASE=1 -j90
make RELEASE=1 -j90 291.66s user 2.54s system 99% cpu 4:55.52 total
With -O0:
$ touch uprobe_multi.c
$ time make RELEASE=1 -j90
make RELEASE=1 -j90 22.40s user 1.91s system 99% cpu 24.355 total
5 minutes vs (still slow, but...) 24 seconds.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240329190410.4191353-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Alexei Starovoitov [Fri, 29 Mar 2024 17:14:39 +0000 (10:14 -0700)]
bpf: Avoid kfree_rcu() under lock in bpf_lpm_trie.
syzbot reported the following lock sequence:
cpu 2:
grabs timer_base lock
spins on bpf_lpm lock
cpu 1:
grab rcu krcp lock
spins on timer_base lock
cpu 0:
grab bpf_lpm lock
spins on rcu krcp lock
bpf_lpm lock can be the same.
timer_base lock can also be the same due to timer migration.
but rcu krcp lock is always per-cpu, so it cannot be the same lock.
Hence it's a false positive.
To avoid lockdep complaining move kfree_rcu() after spin_unlock.
Reported-by: syzbot+1fa663a2100308ab6eab@syzkaller.appspotmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240329171439.37813-1-alexei.starovoitov@gmail.com
Martin KaFai Lau [Fri, 29 Mar 2024 02:04:25 +0000 (19:04 -0700)]
Merge branch 'Use start_server and connect_fd_to_fd'
Geliang Tang says:
====================
Simplify bpf_tcp_ca test by using connect_fd_to_fd and start_server
helpers.
v4:
- Matt reminded me that I shouldn't send a square-to patch to BPF (thanks),
so I update them into two patches in v4.
v3:
- split v2 as two patches as Daniel suggested.
- The patch "selftests/bpf: Use start_server in bpf_tcp_ca" is merged
by Daniel (thanks), but I forgot to drop 'settimeo(lfd, 0)' in it, so
I send a squash-to patch to fix this.
====================
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Geliang Tang [Tue, 26 Mar 2024 10:03:39 +0000 (18:03 +0800)]
selftests/bpf: Drop settimeo in do_test
settimeo is invoked in start_server() and in connect_fd_to_fd() already,
no need to invoke settimeo(lfd, 0) and settimeo(fd, 0) in do_test()
anymore. This patch drops them.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Link: https://lore.kernel.org/r/dbc3613bee3b1c78f95ac9ff468bf47c92f106ea.1711447102.git.tanggeliang@kylinos.cn
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Geliang Tang [Tue, 26 Mar 2024 10:03:38 +0000 (18:03 +0800)]
selftests/bpf: Use connect_fd_to_fd in bpf_tcp_ca
To simplify the code, use BPF selftests helper connect_fd_to_fd() in
bpf_tcp_ca.c instead of open-coding it. This helper is defined in
network_helpers.c, and exported in network_helpers.h, which is already
included in bpf_tcp_ca.c.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Link: https://lore.kernel.org/r/e105d1f225c643bee838409378dd90fd9aabb6dc.1711447102.git.tanggeliang@kylinos.cn
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Martin KaFai Lau [Thu, 28 Mar 2024 18:58:01 +0000 (11:58 -0700)]
bpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode
syzbot reported uninit memory usages during map_{lookup,delete}_elem.
==========
BUG: KMSAN: uninit-value in __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]
BUG: KMSAN: uninit-value in dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796
__dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]
dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796
____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline]
bpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38
___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997
__bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237
==========
The reproducer should be in the interpreter mode.
The C reproducer is trying to run the following bpf prog:
0: (18) r0 = 0x0
2: (18) r1 = map[id:49]
4: (b7) r8 =
16777216
5: (7b) *(u64 *)(r10 -8) = r8
6: (bf) r2 = r10
7: (07) r2 += -229
^^^^^^^^^^
8: (b7) r3 = 8
9: (b7) r4 = 0
10: (85) call dev_map_lookup_elem#
1543472
11: (95) exit
It is due to the "void *key" (r2) passed to the helper. bpf allows uninit
stack memory access for bpf prog with the right privileges. This patch
uses kmsan_unpoison_memory() to mark the stack as initialized.
This should address different syzbot reports on the uninit "void *key"
argument during map_{lookup,delete}_elem.
Reported-by: syzbot+603bcd9b0bf1d94dbb9b@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/bpf/000000000000f9ce6d061494e694@google.com/
Reported-by: syzbot+eb02dc7f03dce0ef39f3@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/bpf/000000000000a5c69c06147c2238@google.com/
Reported-by: syzbot+b4e65ca24fd4d0c734c3@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/bpf/000000000000ac56fb06143b6cfa@google.com/
Reported-by: syzbot+d2b113dc9fea5e1d2848@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/bpf/0000000000000d69b206142d1ff7@google.com/
Reported-by: syzbot+1a3cf6f08d68868f9db3@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/bpf/0000000000006f876b061478e878@google.com/
Tested-by: syzbot+1a3cf6f08d68868f9db3@syzkaller.appspotmail.com
Suggested-by: Yonghong Song <yonghong.song@linux.dev>
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240328185801.1843078-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Alexei Starovoitov [Thu, 28 Mar 2024 01:53:49 +0000 (18:53 -0700)]
Merge branch 'bpf-fix-a-couple-of-test-failures-with-lto-kernel'
Yonghong Song says:
====================
bpf: Fix a couple of test failures with LTO kernel
With a LTO kernel built with clang, with one of earlier version of kernel,
I encountered two test failures, ksyms and kprobe_multi_bench_attach/kernel.
Now with latest bpf-next, only kprobe_multi_bench_attach/kernel failed.
But it is possible in the future ksyms selftest may fail again.
Both test failures are due to static variable/function renaming
due to cross-file inlining. For Ksyms failure, the solution is
to strip .llvm.<hash> suffixes for symbols in /proc/kallsyms before
comparing against the ksym in bpf program.
For kprobe_multi_bench_attach/kernel failure, the solution is
to either provide names in /proc/kallsyms to the kernel or
ignore those names who have .llvm.<hash> suffix since the kernel
sym name comparison is against /proc/kallsyms.
Please see each individual patches for details.
Changelogs:
v2 -> v3:
- no need to check config file, directly so strstr with '.llvm.'.
- for kprobe_multi_bench with syms, instead of skipping the syms,
consult /proc/kallyms to find corresponding names.
- add a test with populating addrs to the kernel for kprobe
multi attach.
v1 -> v2:
- Let libbpf handle .llvm.<hash suffixes since it may impact
bpf program ksym.
====================
Link: https://lore.kernel.org/r/20240326041443.1197498-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:15:23 +0000 (21:15 -0700)]
selftests/bpf: Add a kprobe_multi subtest to use addrs instead of syms
Get addrs directly from available_filter_functions_addrs and
send to the kernel during kprobe_multi_attach. This avoids
consultation of /proc/kallsyms. But available_filter_functions_addrs
is introduced in 6.5, i.e., it is introduced recently,
so I skip the test if the kernel does not support it.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041523.1200301-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:15:18 +0000 (21:15 -0700)]
selftests/bpf: Fix kprobe_multi_bench_attach test failure with LTO kernel
In my locally build clang LTO kernel (enabling CONFIG_LTO and
CONFIG_LTO_CLANG_THIN), kprobe_multi_bench_attach/kernel subtest
failed like:
test_kprobe_multi_bench_attach:PASS:get_syms 0 nsec
test_kprobe_multi_bench_attach:PASS:kprobe_multi_empty__open_and_load 0 nsec
libbpf: prog 'test_kprobe_empty': failed to attach: No such process
test_kprobe_multi_bench_attach:FAIL:bpf_program__attach_kprobe_multi_opts unexpected error: -3
#117/1 kprobe_multi_bench_attach/kernel:FAIL
There are multiple symbols in /sys/kernel/debug/tracing/available_filter_functions
are renamed in /proc/kallsyms due to cross file inlining. One example is for
static function __access_remote_vm in mm/memory.c.
In a non-LTO kernel, we have the following call stack:
ptrace_access_vm (global, kernel/ptrace.c)
access_remote_vm (global, mm/memory.c)
__access_remote_vm (static, mm/memory.c)
With LTO kernel, it is possible that access_remote_vm() is inlined by
ptrace_access_vm(). So we end up with the following call stack:
ptrace_access_vm (global, kernel/ptrace.c)
__access_remote_vm (static, mm/memory.c)
The compiler renames __access_remote_vm to __access_remote_vm.llvm.<hash>
to prevent potential name collision.
The kernel bpf_kprobe_multi_link_attach() and ftrace_lookup_symbols() try
to find addresses based on /proc/kallsyms, hence the current test failed
with LTO kenrel.
This patch consulted /proc/kallsyms to find the corresponding entries
for the ksym and this solved the issue.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041518.1199758-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:15:13 +0000 (21:15 -0700)]
selftests/bpf: Add {load,search}_kallsyms_custom_local()
These two functions allow selftests to do loading/searching
kallsyms based on their specific compare functions.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041513.1199440-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:15:08 +0000 (21:15 -0700)]
selftests/bpf: Refactor trace helper func load_kallsyms_local()
Refactor trace helper function load_kallsyms_local() such that
it invokes a common function with a compare function as input.
The common function will be used later for other local functions.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041508.1199239-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:15:03 +0000 (21:15 -0700)]
selftests/bpf: Refactor some functions for kprobe_multi_test
Refactor some functions in kprobe_multi_test.c to extract
some helper functions who will be used in later patches
to avoid code duplication.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041503.1198982-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:14:58 +0000 (21:14 -0700)]
libbpf: Handle <orig_name>.llvm.<hash> symbol properly
With CONFIG_LTO_CLANG_THIN enabled, with some of previous
version of kernel code base ([1]), I hit the following
error:
test_ksyms:PASS:kallsyms_fopen 0 nsec
test_ksyms:FAIL:ksym_find symbol 'bpf_link_fops' not found
#118 ksyms:FAIL
The reason is that 'bpf_link_fops' is renamed to
bpf_link_fops.llvm.
8325593422554671469
Due to cross-file inlining, the static variable 'bpf_link_fops'
in syscall.c is used by a function in another file. To avoid
potential duplicated names, the llvm added suffix
'.llvm.<hash>' ([2]) to 'bpf_link_fops' variable.
Such renaming caused a problem in libbpf if 'bpf_link_fops'
is used in bpf prog as a ksym but 'bpf_link_fops' does not
match any symbol in /proc/kallsyms.
To fix this issue, libbpf needs to understand that suffix '.llvm.<hash>'
is caused by clang lto kernel and to process such symbols properly.
With latest bpf-next code base built with CONFIG_LTO_CLANG_THIN,
I cannot reproduce the above failure any more. But such an issue
could happen with other symbols or in the future for bpf_link_fops symbol.
For example, with my current kernel, I got the following from
/proc/kallsyms:
ffffffff84782154 d __func__.net_ratelimit.llvm.
6135436931166841955
ffffffff85f0a500 d tk_core.llvm.
726630847145216431
ffffffff85fdb960 d __fs_reclaim_map.llvm.
10487989720912350772
ffffffff864c7300 d fake_dst_ops.llvm.
54750082607048300
I could not easily create a selftest to test newly-added
libbpf functionality with a static C test since I do not know
which symbol is cross-file inlined. But based on my particular kernel,
the following test change can run successfully.
> diff --git a/tools/testing/selftests/bpf/prog_tests/ksyms.c b/tools/testing/selftests/bpf/prog_tests/ksyms.c
> index
6a86d1f07800..
904a103f7b1d 100644
> --- a/tools/testing/selftests/bpf/prog_tests/ksyms.c
> +++ b/tools/testing/selftests/bpf/prog_tests/ksyms.c
> @@ -42,6 +42,7 @@ void test_ksyms(void)
> ASSERT_EQ(data->out__bpf_link_fops, link_fops_addr, "bpf_link_fops");
> ASSERT_EQ(data->out__bpf_link_fops1, 0, "bpf_link_fops1");
> ASSERT_EQ(data->out__btf_size, btf_size, "btf_size");
> + ASSERT_NEQ(data->out__fake_dst_ops, 0, "fake_dst_ops");
> ASSERT_EQ(data->out__per_cpu_start, per_cpu_start_addr, "__per_cpu_start");
>
> cleanup:
> diff --git a/tools/testing/selftests/bpf/progs/test_ksyms.c b/tools/testing/selftests/bpf/progs/test_ksyms.c
> index
6c9cbb5a3bdf..
fe91eef54b66 100644
> --- a/tools/testing/selftests/bpf/progs/test_ksyms.c
> +++ b/tools/testing/selftests/bpf/progs/test_ksyms.c
> @@ -9,11 +9,13 @@ __u64 out__bpf_link_fops = -1;
> __u64 out__bpf_link_fops1 = -1;
> __u64 out__btf_size = -1;
> __u64 out__per_cpu_start = -1;
> +__u64 out__fake_dst_ops = -1;
>
> extern const void bpf_link_fops __ksym;
> extern const void __start_BTF __ksym;
> extern const void __stop_BTF __ksym;
> extern const void __per_cpu_start __ksym;
> +extern const void fake_dst_ops __ksym;
> /* non-existing symbol, weak, default to zero */
> extern const void bpf_link_fops1 __ksym __weak;
>
> @@ -23,6 +25,7 @@ int handler(const void *ctx)
> out__bpf_link_fops = (__u64)&bpf_link_fops;
> out__btf_size = (__u64)(&__stop_BTF - &__start_BTF);
> out__per_cpu_start = (__u64)&__per_cpu_start;
> + out__fake_dst_ops = (__u64)&fake_dst_ops;
>
> out__bpf_link_fops1 = (__u64)&bpf_link_fops1;
This patch fixed the issue in libbpf such that
the suffix '.llvm.<hash>' will be ignored during comparison of
bpf prog ksym vs. symbols in /proc/kallsyms, this resolved the issue.
Currently, only static variables in /proc/kallsyms are checked
with '.llvm.<hash>' suffix since in bpf programs function ksyms
with '.llvm.<hash>' suffix are most likely kfunc's and unlikely
to be cross-file inlined.
Note that currently kernel does not support gcc build with lto.
[1] https://lore.kernel.org/bpf/
20240302165017.
1627295-1-yonghong.song@linux.dev/
[2] https://github.com/llvm/llvm-project/blob/release/18.x/llvm/include/llvm/IR/ModuleSummaryIndex.h#L1714-L1719
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041458.1198161-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:14:53 +0000 (21:14 -0700)]
libbpf: Mark libbpf_kallsyms_parse static function
Currently libbpf_kallsyms_parse() function is declared as a global
function but actually it is not a API and there is no external
users in bpftool/bpf-selftests. So let us mark the function as
static.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041453.1197949-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yonghong Song [Tue, 26 Mar 2024 04:14:48 +0000 (21:14 -0700)]
selftests/bpf: Replace CHECK with ASSERT macros for ksyms test
Replace CHECK with ASSERT macros for ksyms tests.
This test failed earlier with clang lto kernel, but the
issue is gone with latest code base. But replacing
CHECK with ASSERT still improves code as ASSERT is
preferred in selftests.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240326041448.1197812-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Martin KaFai Lau [Fri, 22 Mar 2024 19:14:33 +0000 (12:14 -0700)]
selftests/bpf: Test loading bpf-tcp-cc prog calling the kernel tcp-cc kfuncs
This patch adds a test to ensure all static tcp-cc kfuncs is visible to
the struct_ops bpf programs. It is checked by successfully loading
the struct_ops programs calling these tcp-cc kfuncs.
This patch needs to enable the CONFIG_TCP_CONG_DCTCP and
the CONFIG_TCP_CONG_BBR.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240322191433.4133280-2-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Martin KaFai Lau [Fri, 22 Mar 2024 19:14:32 +0000 (12:14 -0700)]
bpf: Remove CONFIG_X86 and CONFIG_DYNAMIC_FTRACE guard from the tcp-cc kfuncs
The commit
7aae231ac93b ("bpf: tcp: Limit calling some tcp cc functions to CONFIG_DYNAMIC_FTRACE")
added CONFIG_DYNAMIC_FTRACE guard because pahole was only generating
btf for ftrace-able functions. The ftrace filter had already been
removed from pahole, so the CONFIG_DYNAMIC_FTRACE guard can be
removed.
The commit
569c484f9995 ("bpf: Limit static tcp-cc functions in the .BTF_ids list to x86")
has added CONFIG_X86 guard because it failed the powerpc arch which
prepended a "." to the local static function, so "cubictcp_init" becomes
".cubictcp_init". "__bpf_kfunc" has been added to kfunc
since then and it uses the __unused compiler attribute.
There is an existing
"__bpf_kfunc static u32 bpf_kfunc_call_test_static_unused_arg(u32 arg, u32 unused)"
test in bpf_testmod.c to cover the static kfunc case.
cross compile on ppc64 with CONFIG_DYNAMIC_FTRACE disabled:
> readelf -s vmlinux | grep cubictcp_
56938:
c00000000144fd00 184 FUNC LOCAL DEFAULT 2 cubictcp_cwnd_event [<localentry>: 8]
56939:
c00000000144fdb8 200 FUNC LOCAL DEFAULT 2 cubictcp_recalc_[...] [<localentry>: 8]
56940:
c00000000144fe80 296 FUNC LOCAL DEFAULT 2 cubictcp_init [<localentry>: 8]
56941:
c00000000144ffa8 228 FUNC LOCAL DEFAULT 2 cubictcp_state [<localentry>: 8]
56942:
c00000000145008c 1908 FUNC LOCAL DEFAULT 2 cubictcp_cong_avoid [<localentry>: 8]
56943:
c000000001450800 1644 FUNC LOCAL DEFAULT 2 cubictcp_acked [<localentry>: 8]
> bpftool btf dump file vmlinux | grep cubictcp_
[51540] FUNC 'cubictcp_acked' type_id=38137 linkage=static
[51541] FUNC 'cubictcp_cong_avoid' type_id=38122 linkage=static
[51543] FUNC 'cubictcp_cwnd_event' type_id=51542 linkage=static
[51544] FUNC 'cubictcp_init' type_id=9186 linkage=static
[51545] FUNC 'cubictcp_recalc_ssthresh' type_id=35021 linkage=static
[51547] FUNC 'cubictcp_state' type_id=38141 linkage=static
The patch removed both config guards.
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240322191433.4133280-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Yafang Shao [Wed, 27 Mar 2024 03:20:22 +0000 (11:20 +0800)]
bpf: Mitigate latency spikes associated with freeing non-preallocated htab
Following the recent upgrade of one of our BPF programs, we encountered
significant latency spikes affecting other applications running on the same
host. After thorough investigation, we identified that these spikes were
primarily caused by the prolonged duration required to free a
non-preallocated htab with approximately 2 million keys.
Notably, our kernel configuration lacks the presence of CONFIG_PREEMPT. In
scenarios where kernel execution extends excessively, other threads might
be starved of CPU time, resulting in latency issues across the system. To
mitigate this, we've adopted a proactive approach by incorporating
cond_resched() calls within the kernel code. This ensures that during
lengthy kernel operations, the scheduler is invoked periodically to provide
opportunities for other threads to execute.
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240327032022.78391-1-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Alexei Starovoitov [Wed, 27 Mar 2024 22:01:00 +0000 (15:01 -0700)]
Merge branch 'bench-fast-in-kernel-triggering-benchmarks'
Andrii Nakryiko says:
====================
bench: fast in-kernel triggering benchmarks
Remove "legacy" triggering benchmarks which rely on syscalls (and thus syscall
overhead is a noticeable part of benchmark, unfortunately). Replace them with
faster versions that rely on triggering BPF programs in-kernel through another
simple "driver" BPF program. See patch #2 with comparison results.
raw_tp/tp/fmodret benchmarks required adding a simple kfunc in kernel to be
able to trigger a simple tracepoint from BPF program (plus it is also allowed
to be replaced by fmod_ret programs). This limits raw_tp/tp/fmodret benchmarks
to new kernels only, but it keeps bench tool itself very portable and most of
other benchmarks will still work on wide variety of kernels without the need
to worry about building and deploying custom kernel module. See patches #5
and #6 for details.
v1->v2:
- move new TP closer to BPF test run code;
- rename/move kfunc and register it for fmod_rets (Alexei);
- limit --trig-batch-iters param to [1, 1000] (Alexei).
====================
Link: https://lore.kernel.org/r/20240326162151.3981687-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:51 +0000 (09:21 -0700)]
selftests/bpf: add batched tp/raw_tp/fmodret tests
Utilize bpf_modify_return_test_tp() kfunc to have a fast way to trigger
tp/raw_tp/fmodret programs from another BPF program, which gives us
comparable batched benchmarks to (batched) kprobe/fentry benchmarks.
We don't switch kprobe/fentry batched benchmarks to this kfunc to make
bench tool usable on older kernels as well.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-7-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:50 +0000 (09:21 -0700)]
bpf: add bpf_modify_return_test_tp() kfunc triggering tracepoint
Add a simple bpf_modify_return_test_tp() kfunc, available to all program
types, that is useful for various testing and benchmarking scenarios, as
it allows to trigger most tracing BPF program types from BPF side,
allowing to do complex testing and benchmarking scenarios.
It is also attachable to for fmod_ret programs, making it a good and
simple way to trigger fmod_ret program under test/benchmark.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-6-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:49 +0000 (09:21 -0700)]
selftests/bpf: lazy-load trigger bench BPF programs
Instead of front-loading all possible benchmarking BPF programs for
trigger benchmarks, explicitly specify which BPF programs are used by
specific benchmark and load only it.
This allows to be more flexible in supporting older kernels, where some
program types might not be possible to load (e.g., those that rely on
newly added kfunc).
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:48 +0000 (09:21 -0700)]
selftests/bpf: remove syscall-driven benchs, keep syscall-count only
Remove "legacy" benchmarks triggered by syscalls in favor of newly added
in-kernel/batched benchmarks. Drop -batched suffix now as well.
Next patch will restore "feature parity" by adding back
tp/raw_tp/fmodret benchmarks based on in-kernel kfunc approach.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-4-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:47 +0000 (09:21 -0700)]
selftests/bpf: add batched, mostly in-kernel BPF triggering benchmarks
Existing kprobe/fentry triggering benchmarks have 1-to-1 mapping between
one syscall execution and BPF program run. While we use a fast
get_pgid() syscall, syscall overhead can still be non-trivial.
This patch adds kprobe/fentry set of benchmarks significantly amortizing
the cost of syscall vs actual BPF triggering overhead. We do this by
employing BPF_PROG_TEST_RUN command to trigger "driver" raw_tp program
which does a tight parameterized loop calling cheap BPF helper
(bpf_get_numa_node_id()), to which kprobe/fentry programs are
attached for benchmarking.
This way 1 bpf() syscall causes N executions of BPF program being
benchmarked. N defaults to 100, but can be adjusted with
--trig-batch-iters CLI argument.
For comparison we also implement a new baseline program that instead of
triggering another BPF program just does N atomic per-CPU counter
increments, establishing the limit for all other types of program within
this batched benchmarking setup.
Taking the final set of benchmarks added in this patch set (including
tp/raw_tp/fmodret, added in later patch), and keeping for now "legacy"
syscall-driven benchmarks, we can capture all triggering benchmarks in
one place for comparison, before we remove the legacy ones (and rename
xxx-batched into just xxx).
$ benchs/run_bench_trigger.sh
usermode-count : 79.500 ± 0.024M/s
kernel-count : 49.949 ± 0.081M/s
syscall-count : 9.009 ± 0.007M/s
fentry-batch : 31.002 ± 0.015M/s
fexit-batch : 20.372 ± 0.028M/s
fmodret-batch : 21.651 ± 0.659M/s
rawtp-batch : 36.775 ± 0.264M/s
tp-batch : 19.411 ± 0.248M/s
kprobe-batch : 12.949 ± 0.220M/s
kprobe-multi-batch : 15.400 ± 0.007M/s
kretprobe-batch : 5.559 ± 0.011M/s
kretprobe-multi-batch: 5.861 ± 0.003M/s
fentry-legacy : 8.329 ± 0.004M/s
fexit-legacy : 6.239 ± 0.003M/s
fmodret-legacy : 6.595 ± 0.001M/s
rawtp-legacy : 8.305 ± 0.004M/s
tp-legacy : 6.382 ± 0.001M/s
kprobe-legacy : 5.528 ± 0.003M/s
kprobe-multi-legacy : 5.864 ± 0.022M/s
kretprobe-legacy : 3.081 ± 0.001M/s
kretprobe-multi-legacy: 3.193 ± 0.001M/s
Note how xxx-batch variants are measured with significantly higher
throughput, even though it's exactly the same in-kernel overhead. As
such, results can be compared only between benchmarks of the same kind
(syscall vs batched):
fentry-legacy : 8.329 ± 0.004M/s
fentry-batch : 31.002 ± 0.015M/s
kprobe-multi-legacy : 5.864 ± 0.022M/s
kprobe-multi-batch : 15.400 ± 0.007M/s
Note also that syscall-count is setting a theoretical limit for
syscall-triggered benchmarks, while kernel-count is setting similar
limits for batch variants. usermode-count is a happy and unachievable
case of user space counting without doing any syscalls, and is mostly
the measure of CPU speed for such a trivial benchmark.
As was mentioned, tp/raw_tp/fmodret require kernel-side kfunc to produce
similar benchmark, which we address in a separate patch.
Note that run_bench_trigger.sh allows to override a list of benchmarks
to run, which is very useful for performance work.
Cc: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Andrii Nakryiko [Tue, 26 Mar 2024 16:21:46 +0000 (09:21 -0700)]
selftests/bpf: rename and clean up userspace-triggered benchmarks
Rename uprobe-base to more precise usermode-count (it will match other
baseline-like benchmarks, kernel-count and syscall-count). Also use
BENCH_TRIG_USERMODE() macro to define all usermode-based triggering
benchmarks, which include usermode-count and uprobe/uretprobe benchmarks.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240326162151.3981687-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Haiyue Wang [Wed, 27 Mar 2024 06:53:29 +0000 (14:53 +0800)]
bpf,arena: Use helper sizeof_field in struct accessors
Use the well defined helper sizeof_field() to calculate the size of a
struct member, instead of doing custom calculations.
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Link: https://lore.kernel.org/r/20240327065334.8140-1-haiyue.wang@intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Mykyta Yatsenko [Mon, 25 Mar 2024 15:22:10 +0000 (15:22 +0000)]
bpf: improve error message for unsupported helper
BPF verifier emits "unknown func" message when given BPF program type
does not support BPF helper. This message may be confusing for users, as
important context that helper is unknown only to current program type is
not provided.
This patch changes message to "program of this type cannot use helper "
and aligns dependent code in libbpf and tests. Any suggestions on
improving/changing this message are welcome.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/r/20240325152210.377548-1-yatsenko@meta.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Anton Protopopov [Tue, 26 Mar 2024 10:17:42 +0000 (10:17 +0000)]
bpf: Add a check for struct bpf_fib_lookup size
The struct bpf_fib_lookup should not grow outside of its 64 bytes.
Add a static assert to validate this.
Suggested-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240326101742.17421-4-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Anton Protopopov [Tue, 26 Mar 2024 10:17:41 +0000 (10:17 +0000)]
selftests/bpf: Add BPF_FIB_LOOKUP_MARK tests
This patch extends the fib_lookup test suite by adding a few test
cases for each IP family to test the new BPF_FIB_LOOKUP_MARK flag
to the bpf_fib_lookup:
* Test destination IP address selection with and without a mark
and/or the BPF_FIB_LOOKUP_MARK flag set
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240326101742.17421-3-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Anton Protopopov [Tue, 26 Mar 2024 10:17:40 +0000 (10:17 +0000)]
bpf: Add support for passing mark with bpf_fib_lookup
Extend the bpf_fib_lookup() helper by making it to utilize mark if
the BPF_FIB_LOOKUP_MARK flag is set. In order to pass the mark the
four bytes of struct bpf_fib_lookup are used, shared with the
output-only smac/dmac fields.
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240326101742.17421-2-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Jakub Kicinski [Fri, 29 Mar 2024 01:17:54 +0000 (18:17 -0700)]
Merge branch 'ravb-support-describing-the-mdio-bus'
Niklas Söderlund says:
====================
ravb: Support describing the MDIO bus
This series adds support to the binding and driver of the Renesas
Ethernet AVB to described the MDIO bus. Currently the driver uses
the OF node of the device itself when registering the MDIO bus.
This forces any MDIO bus properties the MDIO core should react on
to be set on the device OF node. This is confusing and none of
the MDIO bus properties are described in the Ethernet AVB bindings.
Patch 1/2 extends the bindings with an optional mdio child-node
to the device that can be used to contain the MDIO bus settings.
While patch 2/2 changes the driver to use this node (if present)
when registering the MDIO bus.
If the new optional mdio child-node is not present the driver
fallback to the old behavior and uses the device OF node like before.
This change is fully backward compatible with existing usage
of the bindings.
====================
Link: https://lore.kernel.org/r/20240325153451.2366083-1-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Niklas Söderlund [Mon, 25 Mar 2024 15:34:51 +0000 (16:34 +0100)]
ravb: Add support for an optional MDIO mode
The driver used the DT node of the device itself when registering the
MDIO bus. While this works, it creates a problem: it forces any MDIO bus
properties to also be set on the devices DT node. This mixes the
properties of two distinctly different things and is confusing.
This change adds support for an optional mdio node to be defined as a
child to the device DT node. The child node can then be used to describe
MDIO bus properties that the MDIO core can act on when registering the
bus.
If no mdio child node is found the driver fallback to the old behavior
and register the MDIO bus using the device DT node. This change is
backward compatible with old bindings in use.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240325153451.2366083-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Niklas Söderlund [Mon, 25 Mar 2024 15:34:50 +0000 (16:34 +0100)]
dt-bindings: net: renesas,etheravb: Add optional MDIO bus node
The Renesas Ethernet AVB bindings do not allow the MDIO bus to be
described. This has not been needed as only a single PHY is
supported and no MDIO bus properties have been needed.
Add an optional mdio node to the binding which allows the MDIO bus to be
described and allow bus properties to be set.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240325153451.2366083-2-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Jakub Kicinski [Fri, 29 Mar 2024 01:07:10 +0000 (18:07 -0700)]
Merge branch 'doc-netlink-specs-add-vlan-support'
Hangbin Liu says:
====================
doc/netlink/specs: Add vlan support
Add vlan support in rt_link spec.
====================
Link: https://lore.kernel.org/r/20240327123130.1322921-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Hangbin Liu [Wed, 27 Mar 2024 12:31:29 +0000 (20:31 +0800)]
doc/netlink/specs: Add vlan attr in rt_link spec
With command:
# ./tools/net/ynl/cli.py \
--spec Documentation/netlink/specs/rt_link.yaml \
--do getlink --json '{"ifname": "eno1.2"}' --output-json | \
jq -C '.linkinfo'
Before:
Exception: No message format for 'vlan' in sub-message spec 'linkinfo-data-msg'
After:
{
"kind": "vlan",
"data": {
"protocol": "8021q",
"id": 2,
"flag": {
"flags": [
"reorder-hdr"
],
"mask": "0xffffffff"
},
"egress-qos": {
"mapping": [
{
"from": 1,
"to": 2
},
{
"from": 4,
"to": 4
}
]
}
}
}
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://lore.kernel.org/r/20240327123130.1322921-3-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Hangbin Liu [Wed, 27 Mar 2024 12:31:28 +0000 (20:31 +0800)]
ynl: support hex display_hint for integer
Some times it would be convenient to read the integer as hex, like
mask values.
Suggested-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://lore.kernel.org/r/20240327123130.1322921-2-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Jakub Kicinski [Fri, 29 Mar 2024 01:03:45 +0000 (18:03 -0700)]
Merge branch 'selftests-fixes-for-kernel-ci'
Petr Machata says:
====================
selftests: Fixes for kernel CI
As discussed on the bi-weekly call on Jan 30, and in mailing around
kernel CI effort, some changes are desirable in the suite of forwarding
selftests the better to work with the CI tooling. Namely:
- The forwarding selftests use a configuration file where names of
interfaces are defined and various variables can be overridden. There
is also forwarding.config.sample that users can use as a template to
refer to when creating the config file. What happens a fair bit is
that users either do not know about this at all, or simply forget, and
are confused by cryptic failures about interfaces that cannot be
created.
In patches #1 - #3 have lib.sh just be the single source of truth with
regards to which variables exist. That includes the topology variables
which were previously only in the sample file, and any "tweak
variables", such as what tools to use, sleep times, etc.
forwarding.config.sample then becomes just a placeholder with a couple
examples. Unless specific HW should be exercised, or specific tools
used, the defaults are usually just fine.
- Several net/forwarding/ selftests (and one net/ one) cannot be run on
veth pairs, they need an actual HW interface to run on. They are
generic in the sense that any capable HW should pass them, which is
why they have been put to net/forwarding/ as opposed to drivers/net/,
but they do not generalize to veth. The fact that these tests are in
net/forwarding/, but still complaining when run, is confusing.
In patches #4 - #6 move these tests to a new directory
drivers/net/hw.
- The following patches extend the codebase to handle well test results
other than pass and fail.
Patch #7 is preparatory. It converts several log_test_skip to XFAIL,
so that tests do not spuriously end up returning non-0 when they
are not supposed to.
In patches #8 - #10, introduce some missing ksft constants, then support
having those constants in RET, and then finally in EXIT_STATUS.
- The traffic scheduler tests generate a large amount of network traffic
to test the behavior of the scheduler. This demands a relatively
high-performance computer. On slow machines, such as with a debugging
kernel, the test would spuriously fail.
It can still be useful to "go through the motions" though, to possibly
catch bugs in setup of the scheduler graph and passing packets around.
Thus we still want to run the tests, just with lowered demands.
To that end, in patches #11 - #12, introduce an environment variable
KSFT_MACHINE_SLOW, with obvious meaning. Tests can then make checks
more lenient, such as mark failures as XFAIL. A helper, xfail_on_slow,
is provided to mark performance-sensitive parts of the selftest.
- In patch #13, use a similar mechanism to mark a NH group stats
selftest to XFAIL HW stats tests when run on VETH pairs.
- All these changes complicate the hitherto straightforward logging and
checking logic, so in patch #14, add a selftest that checks this
functionality in lib.sh.
v1 (vs. an RFC circulated through linux-kselftest):
- Patch #9:
- Clarify intended usage by s/set_ret/ret_set_ksft_status/,
s/nret/ksft_status/
====================
Link: https://lore.kernel.org/r/cover.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:41 +0000 (17:54 +0100)]
selftests: forwarding: Add a test for testing lib.sh functionality
Rerunning various scenarios to make sure lib.sh changes do not impact the
observable behavior is no fun. Add a selftest at least for the bare basics
-- the mechanics of setting RET, retmsg, and EXIT_STATUS.
Since the selftest itself uses lib.sh, it would be possible to break lib.sh
in such a way that invalidates result of the selftest. Since the metatest
only uses the bare basics (just pass/fail), hopefully such fundamental
breakages would be noticed.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/6d25cedbf2d4b83614944809a34fe023fbe8db38.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:40 +0000 (17:54 +0100)]
selftests: forwarding: router_mpath_nh_lib: Don't skip, xfail on veth
When the NH group stats tests are currently run on a veth topology, the
HW-stats leg of each test is SKIP'ped. But kernel networking CI interprets
skips as a sign that tooling is missing, and prompts maintainer
investigation. Lack of capability to pass a test should be expressed as
XFAIL.
Selftests that require HW should normally be put in drivers/net/hw, but
doing so for the NH counter selftests would just lead to a lot of
duplicity.
So instead, introduce a helper, xfail_on_veth(), which can be used to mark
selftests that should XFAIL instead of FAILing when run on a veth topology.
On non-veth topology, they don't do anything.
Use the helper in the HW-stats part of router_mpath_nh_lib selftest.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/15f0ab9637aa0497f164ec30e83c1c8f53d53719.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:39 +0000 (17:54 +0100)]
selftests: forwarding: Mark performance-sensitive tests
When run on a slow machine, the scheduler traffic tests can be expected to
fail, and should be reported as XFAIL in that case. Therefore run these
tests through the perf_sensitive wrapper.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/9a357f8cf34f5ececac08d43a3eb023008996035.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:38 +0000 (17:54 +0100)]
selftests: forwarding: Support for performance sensitive tests
Several tests in the suite use large amounts of traffic to e.g. cause
congestion and evaluate RED or shaper performance. These tests will not run
well on a slow machine, be it one with heavy debug kernel, or a VM, or e.g.
a single-board computer. Allow users to specify an environment variable,
KSFT_MACHINE_SLOW=yes, to indicate that the tests are being run on one such
machine.
Performance sensitive tests can then use a new helper, xfail_on_slow(), to
mark parts of the test that are sensitive to low-performance machines.
The helper can be used to just mark the whole suite, like so:
xfail_on_slow tests_run
... or, on the other side of the granularity spectrum, to override
individual checks:
xfail_on_slow check_err $? "Expected much, got little."
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/99a376a2d2ffdaeee7752b1910cb0c3ea5d80fbe.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:37 +0000 (17:54 +0100)]
selftests: forwarding: Convert log_test() to recognize RET values
In a previous patch, the interpretation of RET value was changed to mean
the kselftest framework constant with the test outcome: $ksft_pass,
$ksft_xfail, etc.
Update log_test() to recognize the various possible RET values.
Then have EXIT_STATUS track the RET value of the current test. This differs
subtly from the way RET tracks the value: while for RET we want to
recognize XFAIL as a separate status, for purposes of exit code, we want to
to conflate XFAIL and PASS, because they both communicate non-failure. Thus
add a new helper, ksft_exit_status_merge().
With this log_test_skip() and log_test_xfail() can be reexpressed as thin
wrappers around log_test.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/e5f807cb5476ab795fd14ac74da53a731a9fc432.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:36 +0000 (17:54 +0100)]
selftests: forwarding: Have RET track kselftest framework constants
The variable RET keeps track of whether the test under execution has so far
failed or not. Currently it works in binary fashion: zero means everything
is fine, non-zero means something failed. log_test() then uses the value to
given a human-readable message.
In order to allow log_test() to report skips and xfails, the semantics of
RET need to be more fine-grained. Therefore have RET value be one of
kselftest framework constants: $ksft_fail, $ksft_xfail, etc.
The current logic in check_err() is such that first non-zero value of RET
trumps all those that follow. But that is not right when RET has more
fine-grained value semantics. Different outcomes have different weights.
The results of PASS and XFAIL are mostly the same: they both communicate a
test that did not go wrong. SKIP communicates lack of tooling, which the
user should go and try to fix, and as such should not be overridden by the
passes. So far, the higher-numbered statuses can be considered weightier.
But FAIL should be the weightiest.
Add a helper, ksft_status_merge(), which merges two statuses in a way that
respects the above conditions. Express it in a generic manner, because exit
status merge is subtly different, and we want to reuse the same logic.
Use the new helper when setting RET in check_err().
Re-express check_fail() in terms of check_err() to avoid duplication.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/7dfff51cc925c7a3ac879b9050a0d6a327c8d21f.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:35 +0000 (17:54 +0100)]
selftests: lib: Define more kselftest exit codes
The following patches will operate with more exit codes besides
ksft_skip. Add them here.
Additionally, move a duplicated skip exit code definition from
forwarding/tc_tunnel_key.sh. Keep a similar duplicate in
forwarding/devlink_lib.sh, because even though lib.sh will have
been sourced in all cases where devlink_lib is, the inclusion is not
visible in the file itself, and relying on it would be confusing.
Cc: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/545a03046c7aca0628a51a389a9b81949ab288ce.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:34 +0000 (17:54 +0100)]
selftests: forwarding: Change inappropriate log_test_skip() calls
The SKIP return should be used for cases where tooling of the machine under
test is lacking. For cases where HW is lacking, the appropriate outcome is
XFAIL.
This is the case with ethtool_rmon and mlxsw_lib. For these, introduce a
new helper, log_test_xfail().
Do the same for router_mpath_nh_lib. Note that it will be fixed using a
more reusable way in a following patch.
For the two resource_scale selftests, the log should simply not be written,
because there is no problem.
Cc: Tobias Waldekranz <tobias@waldekranz.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/3d668d8fb6fa0d9eeb47ce6d9e54114348c7c179.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:33 +0000 (17:54 +0100)]
selftests: forwarding: Ditch skip_on_veth()
Since the selftests that are not supposed to run on veth pairs are now in
their own dedicated directory, the skip_on_veth logic can go away. Drop it
from the selftests, and from lib.sh.
Cc: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/63b470e10d65270571ee7de709b31672ce314872.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:32 +0000 (17:54 +0100)]
selftests: forwarding: Move several selftests
The tests in net/forwarding are generally expected to be HW-independent.
There are however several tests that, while not depending on any HW in
particular, nevertheless depend on being used on HW interfaces. Placing
these selftests to net/forwarding is confusing, because the selftest will
just report it can't be run on veth pairs. At the same time, placing them
to a particular driver's selftests subdirectory would be wrong.
Instead, add a new directory, drivers/net/hw, where these generic but HW
independent selftests should be placed. Move over several such tests
including one helper library.
Since typically these tests will not be expected to run, omit the directory
drivers/net/hw from the TARGETS list in selftests/Makefile. Retain a
Makefile in the new directory itself, so that a user can make -C into that
directory and act on those tests explicitly.
Cc: Roger Quadros <rogerq@kernel.org>
Cc: Tobias Waldekranz <tobias@waldekranz.com>
Cc: Danielle Ratson <danieller@nvidia.com>
Cc: Davide Caratti <dcaratti@redhat.com>
Cc: Johannes Nixdorf <jnixdorf-oss@avm.de>
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/e11dae1f62703059e9fc2240004288ac7cc15756.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:31 +0000 (17:54 +0100)]
selftests: forwarding: ipip_lib: Do not import lib.sh
This library is always sourced in the context where lib.sh has already been
sourced as well. Therefore drop the explicit sourcing and expect the client
to already have done it. This will simplify moving some of the clients to a
different directory.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/a4da5e9cd42a34cbace917a048ca71081719d6ac.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:30 +0000 (17:54 +0100)]
selftests: forwarding: README: Document customization
That any sort of customization is possible at all, let alone how it should
be done, is currently not at all clear. Document the whats and hows in
README.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Benjamin Poirier <bpoirier@nvidia.com>
Link: https://lore.kernel.org/r/e819623af6aaeea49e9dc36cecd95694fad73bb8.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:29 +0000 (17:54 +0100)]
selftests: forwarding.config.sample: Move overrides to lib.sh
forwarding.config.sample, net/lib.sh and net/forwarding/lib.sh contain
definitions and redefinitions of some of the same variables. The overlap
between net/forwarding/lib.sh and forwarding.config.sample is especially
large. This duplication is a potential source of confusion and problems.
It would be overall less error prone if each variable were defined in one
place only. In this patch set, that place is the library itself. Therefore
move all comments from forwarding.config.sample to net/forwarding/lib.sh.
Move over also a definition of TC_FLAG, which was missing from lib.sh
entirely.
Additionally, add to lib.sh a default definition of the topology variables.
The logic behind this is that forgetting to specify forwarding.config was a
frequent source of frustration for the selftest users. But really, most of
the time the default veth based topology is just fine. We considered just
sourcing forwarding.config.sample instead if forwarding.config is not
available, but this is a cleaner solution.
That means the syntax of the forwarding.config.sample override has to
change to an array assignment, so that the whole variable is overwritten,
not just individual keys, which could leave the value of some keys
unchanged. Do the same in lib.sh for any cut'n'pasters out there.
The config file is then given a sort of carte blanche to redefine whatever
variables it sees fit from the libraries. This is described in a comment in
the file. Only a handful of variables are left behind, to illustrate the
customization.
The fact that the variables are now missing from forwarding.config.sample,
and therefore would miss from forwarding.config derived from that file as
well, should not change anything. This is just the sample file. Users that
keep their own forwarding.config would retain it as before.
The only observable change is introduction of TC_FLAG to lib.sh, because
now the filters would not be attempted to install to HW datapath. For veth
pairs this does not change anything. For HW deployments, users presumably
have forwarding.config with this value overridden.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Benjamin Poirier <bpoirier@nvidia.com>
Link: https://lore.kernel.org/r/b9b8a11a22821a7aa532211ff461a34f596e26bf.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Petr Machata [Tue, 26 Mar 2024 16:54:28 +0000 (17:54 +0100)]
selftests: net: libs: Change variable fallback syntax
The current syntax of X=${X:=X} first evaluates the ${X:=Y} expression,
which either uses the existing value of $X if there is one, or uses the
value of "Y" as a fallback, and assigns it to X. The expression is then
replaced with the now-current value of $X. Assigning that value to X once
more is meaningless.
So avoid the outer X=... bit, and instead express the same idea though the
do-nothing ":" built-in as : "${X:=Y}". This also cleans up the block
nicely and makes it more readable.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Benjamin Poirier <bpoirier@nvidia.com>
Link: https://lore.kernel.org/r/1890ddc58420c2c0d5ba3154c87ecc6d9faf6947.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Jakub Kicinski [Fri, 29 Mar 2024 00:24:10 +0000 (17:24 -0700)]
Merge git://git./linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR.
No conflicts, or adjacent changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linus Torvalds [Thu, 28 Mar 2024 20:09:37 +0000 (13:09 -0700)]
Merge tag 'net-6.9-rc2' of git://git./linux/kernel/git/netdev/net
Pull networking fixes from Paolo Abeni:
"Including fixes from bpf, WiFi and netfilter.
Current release - regressions:
- ipv6: fix address dump when IPv6 is disabled on an interface
Current release - new code bugs:
- bpf: temporarily disable atomic operations in BPF arena
- nexthop: fix uninitialized variable in nla_put_nh_group_stats()
Previous releases - regressions:
- bpf: protect against int overflow for stack access size
- hsr: fix the promiscuous mode in offload mode
- wifi: don't always use FW dump trig
- tls: adjust recv return with async crypto and failed copy to
userspace
- tcp: properly terminate timers for kernel sockets
- ice: fix memory corruption bug with suspend and rebuild
- at803x: fix kernel panic with at8031_probe
- qeth: handle deferred cc1
Previous releases - always broken:
- bpf: fix bug in BPF_LDX_MEMSX
- netfilter: reject table flag and netdev basechain updates
- inet_defrag: prevent sk release while still in use
- wifi: pick the version of SESSION_PROTECTION_NOTIF
- wwan: t7xx: split 64bit accesses to fix alignment issues
- mlxbf_gige: call request_irq() after NAPI initialized
- hns3: fix kernel crash when devlink reload during pf
initialization"
* tag 'net-6.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (81 commits)
inet: inet_defrag: prevent sk release while still in use
Octeontx2-af: fix pause frame configuration in GMP mode
net: lan743x: Add set RFE read fifo threshold for PCI1x1x chips
net: bcmasp: Remove phy_{suspend/resume}
net: bcmasp: Bring up unimac after PHY link up
net: phy: qcom: at803x: fix kernel panic with at8031_probe
netfilter: arptables: Select NETFILTER_FAMILY_ARP when building arp_tables.c
netfilter: nf_tables: skip netdev hook unregistration if table is dormant
netfilter: nf_tables: reject table flag and netdev basechain updates
netfilter: nf_tables: reject destroy command to remove basechain hooks
bpf: update BPF LSM designated reviewer list
bpf: Protect against int overflow for stack access size
bpf: Check bloom filter map value size
bpf: fix warning for crash_kexec
selftests: netdevsim: set test timeout to 10 minutes
net: wan: framer: Add missing static inline qualifiers
mlxbf_gige: call request_irq() after NAPI initialized
tls: get psock ref after taking rxlock to avoid leak
selftests: tls: add test with a partially invalid iov
tls: adjust recv return with async crypto and failed copy to userspace
...
Florian Westphal [Tue, 26 Mar 2024 10:18:41 +0000 (11:18 +0100)]
inet: inet_defrag: prevent sk release while still in use
ip_local_out() and other functions can pass skb->sk as function argument.
If the skb is a fragment and reassembly happens before such function call
returns, the sk must not be released.
This affects skb fragments reassembled via netfilter or similar
modules, e.g. openvswitch or ct_act.c, when run as part of tx pipeline.
Eric Dumazet made an initial analysis of this bug. Quoting Eric:
Calling ip_defrag() in output path is also implying skb_orphan(),
which is buggy because output path relies on sk not disappearing.
A relevant old patch about the issue was :
8282f27449bf ("inet: frag: Always orphan skbs inside ip_defrag()")
[..]
net/ipv4/ip_output.c depends on skb->sk being set, and probably to an
inet socket, not an arbitrary one.
If we orphan the packet in ipvlan, then downstream things like FQ
packet scheduler will not work properly.
We need to change ip_defrag() to only use skb_orphan() when really
needed, ie whenever frag_list is going to be used.
Eric suggested to stash sk in fragment queue and made an initial patch.
However there is a problem with this:
If skb is refragmented again right after, ip_do_fragment() will copy
head->sk to the new fragments, and sets up destructor to sock_wfree.
IOW, we have no choice but to fix up sk_wmem accouting to reflect the
fully reassembled skb, else wmem will underflow.
This change moves the orphan down into the core, to last possible moment.
As ip_defrag_offset is aliased with sk_buff->sk member, we must move the
offset into the FRAG_CB, else skb->sk gets clobbered.
This allows to delay the orphaning long enough to learn if the skb has
to be queued or if the skb is completing the reasm queue.
In the former case, things work as before, skb is orphaned. This is
safe because skb gets queued/stolen and won't continue past reasm engine.
In the latter case, we will steal the skb->sk reference, reattach it to
the head skb, and fix up wmem accouting when inet_frag inflates truesize.
Fixes: 7026b1ddb6b8 ("netfilter: Pass socket pointer down through okfn().")
Diagnosed-by: Eric Dumazet <edumazet@google.com>
Reported-by: xingwei lee <xrivendell7@gmail.com>
Reported-by: yue sun <samsun1006219@gmail.com>
Reported-by: syzbot+e5167d7144a62715044c@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240326101845.30836-1-fw@strlen.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Hariprasad Kelam [Tue, 26 Mar 2024 05:27:20 +0000 (10:57 +0530)]
Octeontx2-af: fix pause frame configuration in GMP mode
The Octeontx2 MAC block (CGX) has separate data paths (SMU and GMP) for
different speeds, allowing for efficient data transfer.
The previous patch which added pause frame configuration has a bug due
to which pause frame feature is not working in GMP mode.
This patch fixes the issue by configurating appropriate registers.
Fixes: f7e086e754fe ("octeontx2-af: Pause frame configuration at cgx")
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240326052720.4441-1-hkelam@marvell.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Raju Lakkaraju [Tue, 26 Mar 2024 06:58:05 +0000 (12:28 +0530)]
net: lan743x: Add set RFE read fifo threshold for PCI1x1x chips
PCI11x1x Rev B0 devices might drop packets when receiving back to back frames
at 2.5G link speed. Change the B0 Rev device's Receive filtering Engine FIFO
threshold parameter from its hardware default of 4 to 3 dwords to prevent the
problem. Rev C0 and later hardware already defaults to 3 dwords.
Fixes: bb4f6bffe33c ("net: lan743x: Add PCI11010 / PCI11414 device IDs")
Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microchip.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240326065805.686128-1-Raju.Lakkaraju@microchip.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Paolo Abeni [Thu, 28 Mar 2024 09:46:38 +0000 (10:46 +0100)]
Merge branch 'net-bcmasp-phy-managements-fixes'
Justin Chen says:
====================
net: bcmasp: phy managements fixes
Fix two issues.
- The unimac may be put in a bad state if PHY RX clk doesn't exist
during reset. Work around this by bringing the unimac out of reset
during phy up.
- Remove redundant phy_{suspend/resume}
====================
Link: https://lore.kernel.org/r/20240325193025.1540737-1-justin.chen@broadcom.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Justin Chen [Mon, 25 Mar 2024 19:30:25 +0000 (12:30 -0700)]
net: bcmasp: Remove phy_{suspend/resume}
phy_{suspend/resume} is redundant. It gets called from phy_{stop/start}.
Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Justin Chen [Mon, 25 Mar 2024 19:30:24 +0000 (12:30 -0700)]
net: bcmasp: Bring up unimac after PHY link up
The unimac requires the PHY RX clk during reset or it may be put
into a bad state. Bring up the unimac after link up to ensure the
PHY RX clk exists.
Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Christian Marangi [Mon, 25 Mar 2024 19:06:19 +0000 (20:06 +0100)]
net: phy: qcom: at803x: fix kernel panic with at8031_probe
On reworking and splitting the at803x driver, in splitting function of
at803x PHYs it was added a NULL dereference bug where priv is referenced
before it's actually allocated and then is tried to write to for the
is_1000basex and is_fiber variables in the case of at8031, writing on
the wrong address.
Fix this by correctly setting priv local variable only after
at803x_probe is called and actually allocates priv in the phydev struct.
Reported-by: William Wortel <wwortel@dorpstraat.com>
Cc: <stable@vger.kernel.org>
Fixes: 25d2ba94005f ("net: phy: at803x: move specific at8031 probe mode check to dedicated probe")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240325190621.2665-1-ansuelsmth@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Paolo Abeni [Thu, 28 Mar 2024 09:23:02 +0000 (10:23 +0100)]
Merge tag 'nf-24-03-28' of git://git./linux/kernel/git/netfilter/nf
Pablo Neira Ayuso says:
====================
Netfilter fixes for net
The following patchset contains Netfilter fixes for net:
Patch #1 reject destroy chain command to delete device hooks in netdev
family, hence, only delchain commands are allowed.
Patch #2 reject table flag update interference with netdev basechain
hook updates, this can leave hooks in inconsistent
registration/unregistration state.
Patch #3 do not unregister netdev basechain hooks if table is dormant.
Otherwise, splat with double unregistration is possible.
Patch #4 fixes Kconfig to allow to restore IP_NF_ARPTABLES,
from Kuniyuki Iwashima.
There are a more fixes still in progress on my side that need more work.
* tag 'nf-24-03-28' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
netfilter: arptables: Select NETFILTER_FAMILY_ARP when building arp_tables.c
netfilter: nf_tables: skip netdev hook unregistration if table is dormant
netfilter: nf_tables: reject table flag and netdev basechain updates
netfilter: nf_tables: reject destroy command to remove basechain hooks
====================
Link: https://lore.kernel.org/r/20240328031855.2063-1-pablo@netfilter.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Paolo Abeni [Thu, 28 Mar 2024 09:07:59 +0000 (10:07 +0100)]
Merge tag 'for-net' of https://git./linux/kernel/git/bpf/bpf
Alexei Starovoitov says:
====================
pull-request: bpf 2024-03-27
The following pull-request contains BPF updates for your *net* tree.
We've added 4 non-merge commits during the last 1 day(s) which contain
a total of 5 files changed, 26 insertions(+), 3 deletions(-).
The main changes are:
1) Fix bloom filter value size validation and protect the verifier
against such mistakes, from Andrei.
2) Fix build due to CONFIG_KEXEC_CORE/CRASH_DUMP split, from Hari.
3) Update bpf_lsm maintainers entry, from Matt.
* tag 'for-net' of https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
bpf: update BPF LSM designated reviewer list
bpf: Protect against int overflow for stack access size
bpf: Check bloom filter map value size
bpf: fix warning for crash_kexec
====================
Link: https://lore.kernel.org/r/20240328012938.24249-1-alexei.starovoitov@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linus Torvalds [Thu, 28 Mar 2024 03:24:09 +0000 (20:24 -0700)]
Merge tag 'erofs-for-6.9-rc2-fixes' of git://git./linux/kernel/git/xiang/erofs
Pull erofs fixes from Gao Xiang:
- Add a new reviewer Sandeep Dhavale to build a healthier community
- Drop experimental warning for FSDAX
* tag 'erofs-for-6.9-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
MAINTAINERS: erofs: add myself as reviewer
erofs: drop experimental warning for FSDAX
Kuniyuki Iwashima [Tue, 26 Mar 2024 04:15:52 +0000 (21:15 -0700)]
netfilter: arptables: Select NETFILTER_FAMILY_ARP when building arp_tables.c
syzkaller started to report a warning below [0] after consuming the
commit
4654467dc7e1 ("netfilter: arptables: allow xtables-nft only
builds").
The change accidentally removed the dependency on NETFILTER_FAMILY_ARP
from IP_NF_ARPTABLES.
If NF_TABLES_ARP is not enabled on Kconfig, NETFILTER_FAMILY_ARP will
be removed and some code necessary for arptables will not be compiled.
$ grep -E "(NETFILTER_FAMILY_ARP|IP_NF_ARPTABLES|NF_TABLES_ARP)" .config
CONFIG_NETFILTER_FAMILY_ARP=y
# CONFIG_NF_TABLES_ARP is not set
CONFIG_IP_NF_ARPTABLES=y
$ make olddefconfig
$ grep -E "(NETFILTER_FAMILY_ARP|IP_NF_ARPTABLES|NF_TABLES_ARP)" .config
# CONFIG_NF_TABLES_ARP is not set
CONFIG_IP_NF_ARPTABLES=y
So, when nf_register_net_hooks() is called for arptables, it will
trigger the splat below.
Now IP_NF_ARPTABLES is only enabled by IP_NF_ARPFILTER, so let's
restore the dependency on NETFILTER_FAMILY_ARP in IP_NF_ARPFILTER.
[0]:
WARNING: CPU: 0 PID: 242 at net/netfilter/core.c:316 nf_hook_entry_head+0x1e1/0x2c0 net/netfilter/core.c:316
Modules linked in:
CPU: 0 PID: 242 Comm: syz-executor.0 Not tainted
6.8.0-12821-g537c2e91d354 #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
RIP: 0010:nf_hook_entry_head+0x1e1/0x2c0 net/netfilter/core.c:316
Code: 83 fd 04 0f 87 bc 00 00 00 e8 5b 84 83 fd 4d 8d ac ec a8 0b 00 00 e8 4e 84 83 fd 4c 89 e8 5b 5d 41 5c 41 5d c3 e8 3f 84 83 fd <0f> 0b e8 38 84 83 fd 45 31 ed 5b 5d 4c 89 e8 41 5c 41 5d c3 e8 26
RSP: 0018:
ffffc90000b8f6e8 EFLAGS:
00010293
RAX:
0000000000000000 RBX:
0000000000000003 RCX:
ffffffff83c42164
RDX:
ffff888106851180 RSI:
ffffffff83c42321 RDI:
0000000000000005
RBP:
0000000000000000 R08:
0000000000000005 R09:
000000000000000a
R10:
0000000000000003 R11:
ffff8881055c2f00 R12:
ffff888112b78000
R13:
0000000000000000 R14:
ffff8881055c2f00 R15:
ffff8881055c2f00
FS:
00007f377bd78800(0000) GS:
ffff88811b000000(0000) knlGS:
0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
CR2:
0000000000496068 CR3:
000000011298b003 CR4:
0000000000770ef0
PKRU:
55555554
Call Trace:
<TASK>
__nf_register_net_hook+0xcd/0x7a0 net/netfilter/core.c:428
nf_register_net_hook+0x116/0x170 net/netfilter/core.c:578
nf_register_net_hooks+0x5d/0xc0 net/netfilter/core.c:594
arpt_register_table+0x250/0x420 net/ipv4/netfilter/arp_tables.c:1553
arptable_filter_table_init+0x41/0x60 net/ipv4/netfilter/arptable_filter.c:39
xt_find_table_lock+0x2e9/0x4b0 net/netfilter/x_tables.c:1260
xt_request_find_table_lock+0x2b/0xe0 net/netfilter/x_tables.c:1285
get_info+0x169/0x5c0 net/ipv4/netfilter/arp_tables.c:808
do_arpt_get_ctl+0x3f9/0x830 net/ipv4/netfilter/arp_tables.c:1444
nf_getsockopt+0x76/0xd0 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x17d/0x1c0 net/ipv4/ip_sockglue.c:1777
tcp_getsockopt+0x99/0x100 net/ipv4/tcp.c:4373
do_sock_getsockopt+0x279/0x360 net/socket.c:2373
__sys_getsockopt+0x115/0x1e0 net/socket.c:2402
__do_sys_getsockopt net/socket.c:2412 [inline]
__se_sys_getsockopt net/socket.c:2409 [inline]
__x64_sys_getsockopt+0xbd/0x150 net/socket.c:2409
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x4f/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x46/0x4e
RIP: 0033:0x7f377beca6fe
Code: 1f 44 00 00 48 8b 15 01 97 0a 00 f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 c9
RSP: 002b:
00000000005df728 EFLAGS:
00000246 ORIG_RAX:
0000000000000037
RAX:
ffffffffffffffda RBX:
00000000004966e0 RCX:
00007f377beca6fe
RDX:
0000000000000060 RSI:
0000000000000000 RDI:
0000000000000003
RBP:
000000000042938a R08:
00000000005df73c R09:
00000000005df800
R10:
00000000004966e8 R11:
0000000000000246 R12:
0000000000000003
R13:
0000000000496068 R14:
0000000000000003 R15:
00000000004bc9d8
</TASK>
Fixes: 4654467dc7e1 ("netfilter: arptables: allow xtables-nft only builds")
Reported-by: syzkaller <syzkaller@googlegroups.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Pablo Neira Ayuso [Thu, 21 Mar 2024 00:28:07 +0000 (01:28 +0100)]
netfilter: nf_tables: skip netdev hook unregistration if table is dormant
Skip hook unregistration when adding or deleting devices from an
existing netdev basechain. Otherwise, commit/abort path try to
unregister hooks which not enabled.
Fixes: b9703ed44ffb ("netfilter: nf_tables: support for adding new devices to an existing netdev chain")
Fixes: 7d937b107108 ("netfilter: nf_tables: support for deleting devices in an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Pablo Neira Ayuso [Thu, 21 Mar 2024 00:27:59 +0000 (01:27 +0100)]
netfilter: nf_tables: reject table flag and netdev basechain updates
netdev basechain updates are stored in the transaction object hook list.
When setting on the table dormant flag, it iterates over the existing
hooks in the basechain. Thus, skipping the hooks that are being
added/deleted in this transaction, which leaves hook registration in
inconsistent state.
Reject table flag updates in combination with netdev basechain updates
in the same batch:
- Update table flags and add/delete basechain: Check from basechain update
path if there are pending flag updates for this table.
- add/delete basechain and update table flags: Iterate over the transaction
list to search for basechain updates from the table update path.
In both cases, the batch is rejected. Based on suggestion from Florian Westphal.
Fixes: b9703ed44ffb ("netfilter: nf_tables: support for adding new devices to an existing netdev chain")
Fixes: 7d937b107108f ("netfilter: nf_tables: support for deleting devices in an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Pablo Neira Ayuso [Thu, 21 Mar 2024 00:27:50 +0000 (01:27 +0100)]
netfilter: nf_tables: reject destroy command to remove basechain hooks
Report EOPNOTSUPP if NFT_MSG_DESTROYCHAIN is used to delete hooks in an
existing netdev basechain, thus, only NFT_MSG_DELCHAIN is allowed.
Fixes: 7d937b107108f ("netfilter: nf_tables: support for deleting devices in an existing netdev chain")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Jakub Kicinski [Wed, 27 Mar 2024 22:39:17 +0000 (15:39 -0700)]
Merge tag 'wireless-2024-03-27' of git://git./linux/kernel/git/wireless/wireless
Kalle Valo says:
====================
wireless fixes for v6.9-rc2
The first fixes for v6.9. Ping-Ke Shih now maintains a separate tree
for Realtek drivers, document that in the MAINTAINERS. Plenty of fixes
for both to stack and iwlwifi. Our kunit tests were working only on um
architecture but that's fixed now.
* tag 'wireless-2024-03-27' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless: (21 commits)
MAINTAINERS: wifi: mwifiex: add Francesco as reviewer
kunit: fix wireless test dependencies
wifi: iwlwifi: mvm: include link ID when releasing frames
wifi: iwlwifi: mvm: handle debugfs names more carefully
wifi: iwlwifi: mvm: guard against invalid STA ID on removal
wifi: iwlwifi: read txq->read_ptr under lock
wifi: iwlwifi: fw: don't always use FW dump trig
wifi: iwlwifi: mvm: rfi: fix potential response leaks
wifi: mac80211: correctly set active links upon TTLM
wifi: iwlwifi: mvm: Configure the link mapping for non-MLD FW
wifi: iwlwifi: mvm: consider having one active link
wifi: iwlwifi: mvm: pick the version of SESSION_PROTECTION_NOTIF
wifi: mac80211: fix prep_connection error path
wifi: cfg80211: fix rdev_dump_mpp() arguments order
wifi: iwlwifi: mvm: disable MLO for the time being
wifi: cfg80211: add a flag to disable wireless extensions
wifi: mac80211: fix ieee80211_bss_*_flags kernel-doc
wifi: mac80211: check/clear fast rx for non-4addr sta VLAN changes
wifi: mac80211: fix mlme_link_id_dbg()
MAINTAINERS: wifi: add git tree for Realtek WiFi drivers
...
====================
Link: https://lore.kernel.org/r/20240327191346.1A1EAC433C7@smtp.kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linus Torvalds [Wed, 27 Mar 2024 21:53:56 +0000 (14:53 -0700)]
Merge tag '9p-fixes-for-6.9-rc1' of git://git./linux/kernel/git/ericvh/v9fs
Pull 9p fixes from Eric Van Hensbergen:
"Two of these fix syzbot reported issues, and the other fixes a unused
variable in some configurations"
* tag '9p-fixes-for-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
fs/9p: fix uninitialized values during inode evict
fs/9p: remove redundant pointer v9ses
fs/9p: fix uaf in in v9fs_stat2inode_dotl
Linus Torvalds [Wed, 27 Mar 2024 20:56:41 +0000 (13:56 -0700)]
Merge tag 'for-6.9-rc1-tag' of git://git./linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
- fix race when reading extent buffer and 'uptodate' status is missed
by one thread (introduced in 6.5)
- do additional validation of devices using major:minor numbers
- zoned mode fixes:
- use zone-aware super block access during scrub
- fix use-after-free during device replace (found by KASAN)
- also delete zones that are 100% unusable to reclaim space
- extent unpinning fixes:
- fix extent map leak after error handling
- print correct range in error message
- error code and message updates
* tag 'for-6.9-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix race in read_extent_buffer_pages()
btrfs: return accurate error code on open failure in open_fs_devices()
btrfs: zoned: don't skip block groups with 100% zone unusable
btrfs: use btrfs_warn() to log message at btrfs_add_extent_mapping()
btrfs: fix message not properly printing interval when adding extent map
btrfs: fix warning messages not printing interval at unpin_extent_range()
btrfs: fix extent map leak in unexpected scenario at unpin_extent_cache()
btrfs: validate device maj:min during open
btrfs: zoned: fix use-after-free in do_zone_finish()
btrfs: zoned: use zone aware sb location for scrub
Linus Torvalds [Wed, 27 Mar 2024 20:30:48 +0000 (13:30 -0700)]
Merge tag 'mm-hotfixes-stable-2024-03-27-11-25' of git://git./linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"Various hotfixes. About half are cc:stable and the remainder address
post-6.8 issues or aren't considered suitable for backporting.
zswap figures prominently in the post-6.8 issues - folloup against the
large amount of changes we have just made to that code.
Apart from that, all over the map"
* tag 'mm-hotfixes-stable-2024-03-27-11-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (21 commits)
crash: use macro to add crashk_res into iomem early for specific arch
mm: zswap: fix data loss on SWP_SYNCHRONOUS_IO devices
selftests/mm: fix ARM related issue with fork after pthread_create
hexagon: vmlinux.lds.S: handle attributes section
userfaultfd: fix deadlock warning when locking src and dst VMAs
tmpfs: fix race on handling dquot rbtree
selftests/mm: sigbus-wp test requires UFFD_FEATURE_WP_HUGETLBFS_SHMEM
mm: zswap: fix writeback shinker GFP_NOIO/GFP_NOFS recursion
ARM: prctl: reject PR_SET_MDWE on pre-ARMv6
prctl: generalize PR_SET_MDWE support check to be per-arch
MAINTAINERS: remove incorrect M: tag for dm-devel@lists.linux.dev
mm: zswap: fix kernel BUG in sg_init_one
selftests: mm: restore settings from only parent process
tools/Makefile: remove cgroup target
mm: cachestat: fix two shmem bugs
mm: increase folio batch size
mm,page_owner: fix recursion
mailmap: update entry for Leonard Crestez
init: open /initrd.image with O_LARGEFILE
selftests/mm: Fix build with _FORTIFY_SOURCE
...
Matt Bobrowski [Tue, 26 Mar 2024 19:50:19 +0000 (19:50 +0000)]
bpf: update BPF LSM designated reviewer list
Adding myself in place of both Brendan and Florent as both have since
moved on from working on the BPF LSM and will no longer be devoting
their time to maintaining the BPF LSM.
Signed-off-by: Matt Bobrowski <mattbobrowski@google.com>
Acked-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/ZgMhWF_egdYF8t4D@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linus Torvalds [Wed, 27 Mar 2024 17:01:24 +0000 (10:01 -0700)]
Merge tag 'probes-fixes-v6.9-rc1' of git://git./linux/kernel/git/trace/linux-trace
Pull probes fixlet from Masami Hiramatsu:
- tracing/probes: initialize a 'val' local variable with zero.
This variable is read by FETCH_OP_ST_EDATA in a loop, and is
initialized by FETCH_OP_ARG in the same loop. Since this
initialization is not obvious, smatch warns about it.
Explicitly initializing 'val' with zero fixes this warning.
* tag 'probes-fixes-v6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: probes: Fix to zero initialize a local variable