June 2025 - Linux-kselftest-mirror

[PATCH v3] selftests/filesystems/mount-notify: fix unused unused result warning

by Chen Linxuan

When running `make kselftest`, the following compilation warning was encountered: mount-notify_test.c: In function ‘fanotify_rmdir’: mount-notify_test.c:490:17: warning: ignoring return value of ‘chdir’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 490 | chdir("/"); | ^~~~~~~~~~ Signed-off-by: Chen Linxuan <chenlinxuan(a)uniontech.com> --- Changes in v3: - Apply changes suggested by Muhammad Usama Anjum - Link to v2: https://lore.kernel.org/all/20250620035125.2938774-2-chenlinxuan@uniontech.… Changes in v2: - Apply changes suggested by Shuah Khan - Link to v1: https://lore.kernel.org/all/20250610020758.2798787-2-chenlinxuan@uniontech.… --- .../filesystems/mount-notify/mount-notify_test.c | 10 +++++----- .../filesystems/mount-notify/mount-notify_test_ns.c | 10 +++++----- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c index 5a3b0ace1a88c..30ed5e00800ba 100644 --- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c +++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c @@ -458,12 +458,12 @@ TEST_F(fanotify, rmdir) ASSERT_GE(ret, 0); if (ret == 0) { - chdir("/"); - unshare(CLONE_NEWNS); - mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); - umount2("/a", MNT_DETACH); + ASSERT_EQ(chdir("/"), 0); + ASSERT_EQ(unshare(CLONE_NEWNS), 0); + ASSERT_EQ(mount("", "/", NULL, MS_REC | MS_PRIVATE, NULL), 0); + ASSERT_EQ(umount2("/a", MNT_DETACH), 0); // This triggers a detach in the other namespace - rmdir("/a"); + ASSERT_EQ(rmdir("/a"), 0); exit(0); } wait(NULL); diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c index d91946e69591a..11a2cfeb1eb94 100644 --- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c +++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c @@ -486,12 +486,12 @@ TEST_F(fanotify, rmdir) ASSERT_GE(ret, 0); if (ret == 0) { - chdir("/"); - unshare(CLONE_NEWNS); - mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); - umount2("/a", MNT_DETACH); + ASSERT_EQ(chdir("/"), 0); + ASSERT_EQ(unshare(CLONE_NEWNS), 0); + ASSERT_EQ(mount("", "/", NULL, MS_REC | MS_PRIVATE, NULL), 0); + ASSERT_EQ(umount2("/a", MNT_DETACH), 0); // This triggers a detach in the other namespace - rmdir("/a"); + ASSERT_EQ(rmdir("/a"), 0); exit(0); } wait(NULL); -- 2.43.0

5 months, 3 weeks

1
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[PATCH] selftests/filesystems/mount-notify: fix unused unused result warning

by Chen Linxuan

When running `make kselftest`, the following compilation warning was encountered: mount-notify_test.c: In function ‘fanotify_rmdir’: mount-notify_test.c:490:17: warning: ignoring return value of ‘chdir’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 490 | chdir("/"); | ^~~~~~~~~~ Signed-off-by: Chen Linxuan <chenlinxuan(a)uniontech.com> --- Changes in v3: - Apply changes suggested by Muhammad Usama Anjum - Link to v2: https://lore.kernel.org/all/20250620035125.2938774-2-chenlinxuan@uniontech.… Changes in v2: - Apply changes suggested by Shuah Khan - Link to v1: https://lore.kernel.org/all/20250610020758.2798787-2-chenlinxuan@uniontech.… --- .../filesystems/mount-notify/mount-notify_test.c | 10 +++++----- .../filesystems/mount-notify/mount-notify_test_ns.c | 10 +++++----- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c index 5a3b0ace1a88c..30ed5e00800ba 100644 --- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c +++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c @@ -458,12 +458,12 @@ TEST_F(fanotify, rmdir) ASSERT_GE(ret, 0); if (ret == 0) { - chdir("/"); - unshare(CLONE_NEWNS); - mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); - umount2("/a", MNT_DETACH); + ASSERT_EQ(chdir("/"), 0); + ASSERT_EQ(unshare(CLONE_NEWNS), 0); + ASSERT_EQ(mount("", "/", NULL, MS_REC | MS_PRIVATE, NULL), 0); + ASSERT_EQ(umount2("/a", MNT_DETACH), 0); // This triggers a detach in the other namespace - rmdir("/a"); + ASSERT_EQ(rmdir("/a"), 0); exit(0); } wait(NULL); diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c index d91946e69591a..11a2cfeb1eb94 100644 --- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c +++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c @@ -486,12 +486,12 @@ TEST_F(fanotify, rmdir) ASSERT_GE(ret, 0); if (ret == 0) { - chdir("/"); - unshare(CLONE_NEWNS); - mount("", "/", NULL, MS_REC|MS_PRIVATE, NULL); - umount2("/a", MNT_DETACH); + ASSERT_EQ(chdir("/"), 0); + ASSERT_EQ(unshare(CLONE_NEWNS), 0); + ASSERT_EQ(mount("", "/", NULL, MS_REC | MS_PRIVATE, NULL), 0); + ASSERT_EQ(umount2("/a", MNT_DETACH), 0); // This triggers a detach in the other namespace - rmdir("/a"); + ASSERT_EQ(rmdir("/a"), 0); exit(0); } wait(NULL); -- 2.43.0

5 months, 3 weeks

1
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[PATCH v12 0/6] rust: reduce `as` casts, enable related lints

by Tamir Duberstein

This started with a patch that enabled `clippy::ptr_as_ptr`. Benno Lossin suggested I also look into `clippy::ptr_cast_constness` and I discovered `clippy::as_ptr_cast_mut`. This series now enables all 3 lints. It also enables `clippy::as_underscore` which ensures other pointer casts weren't missed. As a later addition, `clippy::cast_lossless` and `clippy::ref_as_ptr` are also enabled. Signed-off-by: Tamir Duberstein <tamird(a)gmail.com> --- Changes in v12: - Remove stale mention of a dependency. (Miguel Ojeda) - Apply to config, cpufreq, and nova. (Miguel Ojeda) - Link to v11: https://lore.kernel.org/r/20250611-ptr-as-ptr-v11-0-ce5b41c6e9c6@gmail.com Changes in v11: - Rebase on v6.16-rc1. - Replace some `as <integer>` with `as bindings::T` and others with `as ffi::T`. (Miguel Ojeda) - Revert explicit `ffi::c_void` import which is in the prelude. (Miguel Ojeda) - Link to v10: https://lore.kernel.org/r/20250418-ptr-as-ptr-v10-0-3d63d27907aa@gmail.com Changes in v10: - Move fragment from "rust: enable `clippy::ptr_cast_constness` lint" to "rust: enable `clippy::ptr_as_ptr` lint". (Boqun Feng) - Replace `(...).into()` with `T::from(...)` where the destination type isn't obvious in "rust: enable `clippy::cast_lossless` lint". (Boqun Feng) - Link to v9: https://lore.kernel.org/r/20250416-ptr-as-ptr-v9-0-18ec29b1b1f3@gmail.com Changes in v9: - Replace ref-to-ptr coercion using `let` bindings with `core::ptr::from_{ref,mut}`. (Boqun Feng). - Link to v8: https://lore.kernel.org/r/20250409-ptr-as-ptr-v8-0-3738061534ef@gmail.com Changes in v8: - Use coercion to go ref -> ptr. - rustfmt. - Rebase on v6.15-rc1. - Extract first commit to its own series as it is shared with other series. - Link to v7: https://lore.kernel.org/r/20250325-ptr-as-ptr-v7-0-87ab452147b9@gmail.com Changes in v7: - Add patch to enable `clippy::ref_as_ptr`. - Link to v6: https://lore.kernel.org/r/20250324-ptr-as-ptr-v6-0-49d1b7fd4290@gmail.com Changes in v6: - Drop strict provenance patch. - Fix URLs in doc comments. - Add patch to enable `clippy::cast_lossless`. - Rebase on rust-next. - Link to v5: https://lore.kernel.org/r/20250317-ptr-as-ptr-v5-0-5b5f21fa230a@gmail.com Changes in v5: - Use `pointer::addr` in OF. (Boqun Feng) - Add documentation on stubs. (Benno Lossin) - Mark stubs `#[inline]`. - Pick up Alice's RB on a shared commit from https://lore.kernel.org/all/Z9f-3Aj3_FWBZRrm@google.com/. - Link to v4: https://lore.kernel.org/r/20250315-ptr-as-ptr-v4-0-b2d72c14dc26@gmail.com Changes in v4: - Add missing SoB. (Benno Lossin) - Use `without_provenance_mut` in alloc. (Boqun Feng) - Limit strict provenance lints to the `kernel` crate to avoid complex logic in the build system. This can be revisited on MSRV >= 1.84.0. - Rebase on rust-next. - Link to v3: https://lore.kernel.org/r/20250314-ptr-as-ptr-v3-0-e7ba61048f4a@gmail.com Changes in v3: - Fixed clippy warning in rust/kernel/firmware.rs. (kernel test robot) Link: https://lore.kernel.org/all/202503120332.YTCpFEvv-lkp@intel.com/ - s/as u64/as bindings::phys_addr_t/g. (Benno Lossin) - Use strict provenance APIs and enable lints. (Benno Lossin) - Link to v2: https://lore.kernel.org/r/20250309-ptr-as-ptr-v2-0-25d60ad922b7@gmail.com Changes in v2: - Fixed typo in first commit message. - Added additional patches, converted to series. - Link to v1: https://lore.kernel.org/r/20250307-ptr-as-ptr-v1-1-582d06514c98@gmail.com --- Tamir Duberstein (6): rust: enable `clippy::ptr_as_ptr` lint rust: enable `clippy::ptr_cast_constness` lint rust: enable `clippy::as_ptr_cast_mut` lint rust: enable `clippy::as_underscore` lint rust: enable `clippy::cast_lossless` lint rust: enable `clippy::ref_as_ptr` lint Makefile | 6 ++++ drivers/gpu/drm/drm_panic_qr.rs | 4 +-- drivers/gpu/nova-core/driver.rs | 2 +- drivers/gpu/nova-core/regs.rs | 2 +- drivers/gpu/nova-core/regs/macros.rs | 2 +- rust/bindings/lib.rs | 3 ++ rust/kernel/alloc/allocator_test.rs | 2 +- rust/kernel/alloc/kvec.rs | 4 +-- rust/kernel/block/mq/operations.rs | 2 +- rust/kernel/block/mq/request.rs | 11 +++++-- rust/kernel/configfs.rs | 22 +++++--------- rust/kernel/cpufreq.rs | 2 +- rust/kernel/device.rs | 4 +-- rust/kernel/device_id.rs | 4 +-- rust/kernel/devres.rs | 17 +++++------ rust/kernel/dma.rs | 6 ++-- rust/kernel/drm/device.rs | 6 ++-- rust/kernel/error.rs | 2 +- rust/kernel/firmware.rs | 3 +- rust/kernel/fs/file.rs | 2 +- rust/kernel/io.rs | 18 ++++++------ rust/kernel/kunit.rs | 11 ++++--- rust/kernel/list/impl_list_item_mod.rs | 2 +- rust/kernel/miscdevice.rs | 2 +- rust/kernel/mm/virt.rs | 52 +++++++++++++++++----------------- rust/kernel/net/phy.rs | 4 +-- rust/kernel/of.rs | 6 ++-- rust/kernel/pci.rs | 11 ++++--- rust/kernel/platform.rs | 4 ++- rust/kernel/print.rs | 6 ++-- rust/kernel/seq_file.rs | 2 +- rust/kernel/str.rs | 14 ++++----- rust/kernel/sync/poll.rs | 2 +- rust/kernel/time/hrtimer/pin.rs | 2 +- rust/kernel/time/hrtimer/pin_mut.rs | 2 +- rust/kernel/uaccess.rs | 4 +-- rust/kernel/workqueue.rs | 8 +++--- rust/uapi/lib.rs | 3 ++ 38 files changed, 139 insertions(+), 120 deletions(-) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250307-ptr-as-ptr-21b1867fc4d4 Best regards, -- Tamir Duberstein <tamird(a)gmail.com>

5 months, 3 weeks

9
31
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[RFC PATCH 0/6] selftests/damon: add python and drgn based DAMON sysfs functionality tests

by SeongJae Park

DAMON sysfs interface is the bridge between the user space and the kernel space for DAMON parameters. There is no good and simple test to see if the parameters are set as expected. Existing DAMON selftests therefore test end-to-end features. For example, damos_quota_goal.py runs a DAMOS scheme with quota goal set against a test program running an artificial access pattern, and see if the result is as expected. Such tests cover only a few part of DAMON. Adding more tests is also complicated. Finally, the reliability of the test itself on different systems is bad. 'drgn' is a tool that can extract kernel internal data structures like DAMON parameters. Add a test that passes specific DAMON parameters via DAMON sysfs reusing _damon_sysfs.py, extract resulting DAMON parameters via 'drgn', and compare those. Note that this test is not adding exhaustive tests of all DAMON parameters and input combinations but very basic things. Advancing the test infrastructure and adding more tests are future works. SeongJae Park (6): selftests/damon: add drgn script for extracting damon status selftests/damon/_damon_sysfs: set Kdamond.pid in start() selftests/damon: add python and drgn-based DAMON sysfs test selftests/damon/sysfs.py: test monitoring attribute parameters selftests/damon/sysfs.py: test adaptive targets parameter selftests/damon/sysfs.py: test DAMOS schemes parameters setup tools/testing/selftests/damon/Makefile | 1 + tools/testing/selftests/damon/_damon_sysfs.py | 3 + .../selftests/damon/drgn_dump_damon_status.py | 161 ++++++++++++++++++ tools/testing/selftests/damon/sysfs.py | 115 +++++++++++++ 4 files changed, 280 insertions(+) create mode 100755 tools/testing/selftests/damon/drgn_dump_damon_status.py create mode 100755 tools/testing/selftests/damon/sysfs.py base-commit: 59f618c718d036132b59bcf997943d4f5520149f -- 2.39.5

5 months, 3 weeks

1
6
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[PATCH net-next, v2] selftest: add selftest for anycast notifications

by Yuyang Huang

This commit adds a new kernel selftest to verify RTNLGRP_IPV6_ACADDR notifications. The test works by adding/removing a dummy interface, enabling packet forwarding, and then confirming that user space can correctly receive anycast notifications. The test relies on the iproute2 version to be 6.13+. Tested by the following command: $ vng -v --user root --cpus 16 -- \ make -C tools/testing/selftests TARGETS=net TEST_PROGS=rtnetlink_notification.sh \ TEST_GEN_PROGS="" run_tests Cc: Maciej Żenczykowski <maze(a)google.com> Cc: Lorenzo Colitti <lorenzo(a)google.com> Signed-off-by: Yuyang Huang <yuyanghuang(a)google.com> --- Changelog since v1: - Remote unrelated clean up code. .../selftests/net/rtnetlink_notification.sh | 44 ++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/rtnetlink_notification.sh b/tools/testing/selftests/net/rtnetlink_notification.sh index 39c1b815bbe4..3f9780232bd6 100755 --- a/tools/testing/selftests/net/rtnetlink_notification.sh +++ b/tools/testing/selftests/net/rtnetlink_notification.sh @@ -8,9 +8,11 @@ ALL_TESTS=" kci_test_mcast_addr_notification + kci_test_anycast_addr_notification " source lib.sh +test_dev="test-dummy1" kci_test_mcast_addr_notification() { @@ -18,7 +20,6 @@ kci_test_mcast_addr_notification() local tmpfile local monitor_pid local match_result - local test_dev="test-dummy1" tmpfile=$(mktemp) defer rm "$tmpfile" @@ -56,6 +57,47 @@ kci_test_mcast_addr_notification() return $RET } +kci_test_anycast_addr_notification() +{ + RET=0 + local tmpfile + local monitor_pid + local match_result + + tmpfile=$(mktemp) + defer rm "$tmpfile" + + ip monitor acaddress > "$tmpfile" & + monitor_pid=$! + defer kill_process "$monitor_pid" + sleep 1 + + if [ ! -e "/proc/$monitor_pid" ]; then + RET=$ksft_skip + log_test "anycast addr notification: iproute2 too old" + return "$RET" + fi + + ip link add name "$test_dev" type dummy + check_err $? "failed to add dummy interface" + ip link set "$test_dev" up + check_err $? "failed to set dummy interface up" + sysctl -qw net.ipv6.conf."$test_dev".forwarding=1 + ip link del dev "$test_dev" + check_err $? "Failed to delete dummy interface" + sleep 1 + + # There should be 2 line matches as follows. + # 9: dummy2 inet6 any fe80:: scope global + # Deleted 9: dummy2 inet6 any fe80:: scope global + match_result=$(grep -cE "$test_dev.*(fe80::)" "$tmpfile") + if [ "$match_result" -ne 2 ]; then + RET=$ksft_fail + fi + log_test "anycast addr notification: Expected 2 matches, got $match_result" + return "$RET" +} + #check for needed privileges if [ "$(id -u)" -ne 0 ];then RET=$ksft_skip -- 2.50.0.rc2.701.gf1e915cc24-goog

5 months, 3 weeks

3
2
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[PATCH net-next 8/9] selftests: drv-net: import things in lib one by one

by Jakub Kicinski

pylint doesn't understand our path hacks, and it generates a lot of warnings for driver tests. Import what we use one by one, this is hopefully not too tedious and it makes pylint happy. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- CC: shuah(a)kernel.org CC: mohan.prasad(a)microchip.com CC: sdf(a)fomichev.me CC: dw(a)davidwei.uk CC: linux-kselftest(a)vger.kernel.org --- .../selftests/drivers/net/hw/lib/py/__init__.py | 17 +++++++++++++++++ .../selftests/drivers/net/lib/py/__init__.py | 14 ++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/tools/testing/selftests/drivers/net/hw/lib/py/__init__.py b/tools/testing/selftests/drivers/net/hw/lib/py/__init__.py index b582885786f5..56ff11074b55 100644 --- a/tools/testing/selftests/drivers/net/hw/lib/py/__init__.py +++ b/tools/testing/selftests/drivers/net/hw/lib/py/__init__.py @@ -7,8 +7,25 @@ KSFT_DIR = (Path(__file__).parent / "../../../../..").resolve() try: sys.path.append(KSFT_DIR.as_posix()) + from net.lib.py import * from drivers.net.lib.py import * + + # Import one by one to avoid pylint false positives + from net.lib.py import EthtoolFamily, NetdevFamily, NetshaperFamily, \ + NlError, RtnlFamily + from net.lib.py import CmdExitFailure + from net.lib.py import bkg, cmd, defer, ethtool, fd_read_timeout, ip, \ + rand_port, tool, wait_port_listen + from net.lib.py import fd_read_timeout + from net.lib.py import KsftSkipEx, KsftFailEx, KsftXfailEx + from net.lib.py import ksft_disruptive, ksft_exit, ksft_pr, ksft_run, \ + ksft_setup + from net.lib.py import ksft_eq, ksft_ge, ksft_in, ksft_is, ksft_lt, \ + ksft_ne, ksft_not_in, ksft_raises, ksft_true + from net.lib.py import NetNSEnter + from drivers.net.lib.py import GenerateTraffic + from drivers.net.lib.py import NetDrvEnv, NetDrvEpEnv except ModuleNotFoundError as e: ksft_pr("Failed importing `net` library from kernel sources") ksft_pr(str(e)) diff --git a/tools/testing/selftests/drivers/net/lib/py/__init__.py b/tools/testing/selftests/drivers/net/lib/py/__init__.py index 401e70f7f136..9ed1d8f70524 100644 --- a/tools/testing/selftests/drivers/net/lib/py/__init__.py +++ b/tools/testing/selftests/drivers/net/lib/py/__init__.py @@ -7,7 +7,21 @@ KSFT_DIR = (Path(__file__).parent / "../../../..").resolve() try: sys.path.append(KSFT_DIR.as_posix()) + from net.lib.py import * + + # Import one by one to avoid pylint false positives + from net.lib.py import EthtoolFamily, NetdevFamily, NetshaperFamily, \ + NlError, RtnlFamily + from net.lib.py import CmdExitFailure + from net.lib.py import bkg, cmd, defer, ethtool, fd_read_timeout, ip, \ + rand_port, tool, wait_port_listen + from net.lib.py import fd_read_timeout + from net.lib.py import KsftSkipEx, KsftFailEx, KsftXfailEx + from net.lib.py import ksft_disruptive, ksft_exit, ksft_pr, ksft_run, \ + ksft_setup + from net.lib.py import ksft_eq, ksft_ge, ksft_in, ksft_is, ksft_lt, \ + ksft_ne, ksft_not_in, ksft_raises, ksft_true except ModuleNotFoundError as e: ksft_pr("Failed importing `net` library from kernel sources") ksft_pr(str(e)) -- 2.49.0

5 months, 3 weeks

1
0
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[PATCH v5 14/14] selftests/sched_ext: Add test for DL server total_bw consistency

by Joel Fernandes

Add a new kselftest to verify that the total_bw value in /sys/kernel/debug/sched/debug remains consistent across all CPUs under different sched_ext BPF program states: 1. Before a BPF scheduler is loaded 2. While a BPF scheduler is loaded and active 3. After a BPF scheduler is unloaded The test runs CPU stress threads to ensure DL server bandwidth values stabilize before checking consistency. This helps catch potential issues with DL server bandwidth accounting during sched_ext transitions. Signed-off-by: Joel Fernandes <joelagnelf(a)nvidia.com> --- tools/testing/selftests/sched_ext/Makefile | 1 + tools/testing/selftests/sched_ext/total_bw.c | 286 +++++++++++++++++++ 2 files changed, 287 insertions(+) create mode 100644 tools/testing/selftests/sched_ext/total_bw.c diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile index f0a8cba3a99f..d48be158b0a1 100644 --- a/tools/testing/selftests/sched_ext/Makefile +++ b/tools/testing/selftests/sched_ext/Makefile @@ -184,6 +184,7 @@ auto-test-targets := \ select_cpu_vtime \ rt_stall \ test_example \ + total_bw \ testcase-targets := $(addsuffix .o,$(addprefix $(SCXOBJ_DIR)/,$(auto-test-targets))) diff --git a/tools/testing/selftests/sched_ext/total_bw.c b/tools/testing/selftests/sched_ext/total_bw.c new file mode 100644 index 000000000000..6b81d6c51054 --- /dev/null +++ b/tools/testing/selftests/sched_ext/total_bw.c @@ -0,0 +1,286 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test to verify that total_bw value remains consistent across all CPUs + * in different BPF program states. + * + * Copyright (C) 2025 Nvidia Corporation. + */ +#include <bpf/bpf.h> +#include <errno.h> +#include <pthread.h> +#include <scx/common.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/wait.h> +#include <unistd.h> +#include "minimal.bpf.skel.h" +#include "scx_test.h" + +#define MAX_CPUS 512 +#define STABILIZATION_TIME_SEC 5 +#define STRESS_DURATION_SEC 5 + +struct total_bw_ctx { + struct minimal *skel; + long baseline_bw[MAX_CPUS]; + int nr_cpus; +}; + +static void *cpu_stress_thread(void *arg) +{ + volatile int i; + time_t end_time = time(NULL) + STRESS_DURATION_SEC; + + while (time(NULL) < end_time) { + for (i = 0; i < 1000000; i++); + } + + return NULL; +} + +/* + * The first enqueue on a CPU causes the DL server to start, for that + * reason run stressor threads in the hopes it schedules on all CPUs. + */ +static int run_cpu_stress(int nr_cpus) +{ + pthread_t *threads; + int i, ret = 0; + + threads = calloc(nr_cpus, sizeof(pthread_t)); + if (!threads) + return -ENOMEM; + + /* Create threads to run on each CPU */ + for (i = 0; i < nr_cpus; i++) { + if (pthread_create(&threads[i], NULL, cpu_stress_thread, NULL)) { + ret = -errno; + fprintf(stderr, "Failed to create thread %d: %s\n", i, strerror(-ret)); + break; + } + } + + /* Wait for all threads to complete */ + for (i = 0; i < nr_cpus; i++) { + if (threads[i]) + pthread_join(threads[i], NULL); + } + + free(threads); + return ret; +} + +static int read_total_bw_values(long *bw_values, int max_cpus) +{ + FILE *fp; + char line[256]; + int cpu_count = 0; + + fp = fopen("/sys/kernel/debug/sched/debug", "r"); + if (!fp) { + SCX_ERR("Failed to open debug file"); + return -1; + } + + while (fgets(line, sizeof(line), fp)) { + char *bw_str = strstr(line, "total_bw"); + if (bw_str) { + bw_str = strchr(bw_str, ':'); + if (bw_str) { + /* Only store up to max_cpus values */ + if (cpu_count < max_cpus) { + bw_values[cpu_count] = atol(bw_str + 1); + } + cpu_count++; + } + } + } + + fclose(fp); + return cpu_count; +} + +static bool verify_total_bw_consistency(long *bw_values, int count) +{ + int i; + long first_value; + + if (count <= 0) + return false; + + first_value = bw_values[0]; + + for (i = 1; i < count; i++) { + if (bw_values[i] != first_value) { + SCX_ERR("Inconsistent total_bw: CPU0=%ld, CPU%d=%ld", + first_value, i, bw_values[i]); + return false; + } + } + + return true; +} + +static int fetch_verify_total_bw(long *bw_values, int nr_cpus) +{ + int attempts = 0; + int max_attempts = 10; + int count; + + /* + * The first enqueue on a CPU causes the DL server to start, for that + * reason run stressor threads in the hopes it schedules on all CPUs. + */ + if (run_cpu_stress(nr_cpus) < 0) { + SCX_ERR("Failed to run CPU stress"); + return -1; + } + + /* Let things settle down */ + sleep(STABILIZATION_TIME_SEC); + + /* Try multiple times to get stable values */ + while (attempts < max_attempts) { + count = read_total_bw_values(bw_values, nr_cpus); + fprintf(stderr, "Read %d total_bw values (testing %d CPUs)\n", count, nr_cpus); + /* If system has more CPUs than we're testing, that's OK */ + if (count < nr_cpus) { + SCX_ERR("Expected at least %d CPUs, got %d", nr_cpus, count); + attempts++; + sleep(1); + continue; + } + + /* Only verify the CPUs we're testing */ + if (verify_total_bw_consistency(bw_values, nr_cpus)) { + fprintf(stderr, "Values are consistent: %ld\n", bw_values[0]); + return 0; + } + + attempts++; + sleep(1); + } + + return -1; +} + +static enum scx_test_status setup(void **ctx) +{ + struct total_bw_ctx *test_ctx; + + if (access("/sys/kernel/debug/sched/debug", R_OK) != 0) { + fprintf(stderr, "Skipping test: debugfs sched/debug not accessible\n"); + return SCX_TEST_SKIP; + } + + test_ctx = calloc(1, sizeof(*test_ctx)); + if (!test_ctx) + return SCX_TEST_FAIL; + + test_ctx->nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); + if (test_ctx->nr_cpus <= 0) { + free(test_ctx); + return SCX_TEST_FAIL; + } + + /* If system has more CPUs than MAX_CPUS, just test the first MAX_CPUS */ + if (test_ctx->nr_cpus > MAX_CPUS) { + test_ctx->nr_cpus = MAX_CPUS; + } + + /* Test scenario 1: BPF program not loaded */ + /* Read and verify baseline total_bw before loading BPF program */ + fprintf(stderr, "BPF prog initially not loaded, reading total_bw values\n"); + if (fetch_verify_total_bw(test_ctx->baseline_bw, test_ctx->nr_cpus) < 0) { + SCX_ERR("Failed to get stable baseline values"); + free(test_ctx); + return SCX_TEST_FAIL; + } + + /* Load the BPF skeleton */ + test_ctx->skel = minimal__open(); + if (!test_ctx->skel) { + free(test_ctx); + return SCX_TEST_FAIL; + } + + SCX_ENUM_INIT(test_ctx->skel); + if (minimal__load(test_ctx->skel)) { + minimal__destroy(test_ctx->skel); + free(test_ctx); + return SCX_TEST_FAIL; + } + + *ctx = test_ctx; + return SCX_TEST_PASS; +} + +static enum scx_test_status run(void *ctx) +{ + struct total_bw_ctx *test_ctx = ctx; + struct bpf_link *link; + long loaded_bw[MAX_CPUS]; + long unloaded_bw[MAX_CPUS]; + int i; + + /* Test scenario 2: BPF program loaded */ + link = bpf_map__attach_struct_ops(test_ctx->skel->maps.minimal_ops); + if (!link) { + SCX_ERR("Failed to attach scheduler"); + return SCX_TEST_FAIL; + } + + fprintf(stderr, "BPF program loaded, reading total_bw values\n"); + if (fetch_verify_total_bw(loaded_bw, test_ctx->nr_cpus) < 0) { + SCX_ERR("Failed to get stable values with BPF loaded"); + bpf_link__destroy(link); + return SCX_TEST_FAIL; + } + bpf_link__destroy(link); + + /* Test scenario 3: BPF program unloaded */ + fprintf(stderr, "BPF program unloaded, reading total_bw values\n"); + if (fetch_verify_total_bw(unloaded_bw, test_ctx->nr_cpus) < 0) { + SCX_ERR("Failed to get stable values after BPF unload"); + return SCX_TEST_FAIL; + } + + /* Verify all three scenarios have the same total_bw values */ + for (i = 0; i < test_ctx->nr_cpus; i++) { + if (test_ctx->baseline_bw[i] != loaded_bw[i]) { + SCX_ERR("CPU%d: baseline_bw=%ld != loaded_bw=%ld", + i, test_ctx->baseline_bw[i], loaded_bw[i]); + return SCX_TEST_FAIL; + } + + if (test_ctx->baseline_bw[i] != unloaded_bw[i]) { + SCX_ERR("CPU%d: baseline_bw=%ld != unloaded_bw=%ld", + i, test_ctx->baseline_bw[i], unloaded_bw[i]); + return SCX_TEST_FAIL; + } + } + + fprintf(stderr, "All total_bw values are consistent across all scenarios\n"); + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct total_bw_ctx *test_ctx = ctx; + + if (test_ctx) { + if (test_ctx->skel) + minimal__destroy(test_ctx->skel); + free(test_ctx); + } +} + +struct scx_test total_bw = { + .name = "total_bw", + .description = "Verify total_bw consistency across BPF program states", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&total_bw) -- 2.43.0

5 months, 3 weeks

1
0
0 0

[PATCH v5 12/14] selftests/sched_ext: Add test for sched_ext dl_server

by Joel Fernandes

From: Andrea Righi <arighi(a)nvidia.com> Add a selftest to validate the correct behavior of the deadline server for the ext_sched_class. [ Joel: Replaced occurences of CFS in the test with EXT. ] Signed-off-by: Joel Fernandes <joelagnelf(a)nvidia.com> Signed-off-by: Andrea Righi <arighi(a)nvidia.com> --- tools/testing/selftests/sched_ext/Makefile | 1 + .../selftests/sched_ext/rt_stall.bpf.c | 23 ++ tools/testing/selftests/sched_ext/rt_stall.c | 213 ++++++++++++++++++ 3 files changed, 237 insertions(+) create mode 100644 tools/testing/selftests/sched_ext/rt_stall.bpf.c create mode 100644 tools/testing/selftests/sched_ext/rt_stall.c diff --git a/tools/testing/selftests/sched_ext/Makefile b/tools/testing/selftests/sched_ext/Makefile index 9d9d6b4c38b0..f0a8cba3a99f 100644 --- a/tools/testing/selftests/sched_ext/Makefile +++ b/tools/testing/selftests/sched_ext/Makefile @@ -182,6 +182,7 @@ auto-test-targets := \ select_cpu_dispatch_bad_dsq \ select_cpu_dispatch_dbl_dsp \ select_cpu_vtime \ + rt_stall \ test_example \ testcase-targets := $(addsuffix .o,$(addprefix $(SCXOBJ_DIR)/,$(auto-test-targets))) diff --git a/tools/testing/selftests/sched_ext/rt_stall.bpf.c b/tools/testing/selftests/sched_ext/rt_stall.bpf.c new file mode 100644 index 000000000000..80086779dd1e --- /dev/null +++ b/tools/testing/selftests/sched_ext/rt_stall.bpf.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * A scheduler that verified if RT tasks can stall SCHED_EXT tasks. + * + * Copyright (c) 2025 NVIDIA Corporation. + */ + +#include <scx/common.bpf.h> + +char _license[] SEC("license") = "GPL"; + +UEI_DEFINE(uei); + +void BPF_STRUCT_OPS(rt_stall_exit, struct scx_exit_info *ei) +{ + UEI_RECORD(uei, ei); +} + +SEC(".struct_ops.link") +struct sched_ext_ops rt_stall_ops = { + .exit = (void *)rt_stall_exit, + .name = "rt_stall", +}; diff --git a/tools/testing/selftests/sched_ext/rt_stall.c b/tools/testing/selftests/sched_ext/rt_stall.c new file mode 100644 index 000000000000..d4cb545ebfd8 --- /dev/null +++ b/tools/testing/selftests/sched_ext/rt_stall.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 NVIDIA Corporation. + */ +#define _GNU_SOURCE +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <sched.h> +#include <sys/prctl.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <time.h> +#include <linux/sched.h> +#include <signal.h> +#include <bpf/bpf.h> +#include <scx/common.h> +#include <sys/wait.h> +#include <unistd.h> +#include "rt_stall.bpf.skel.h" +#include "scx_test.h" +#include "../kselftest.h" + +#define CORE_ID 0 /* CPU to pin tasks to */ +#define RUN_TIME 5 /* How long to run the test in seconds */ + +/* Simple busy-wait function for test tasks */ +static void process_func(void) +{ + while (1) { + /* Busy wait */ + for (volatile unsigned long i = 0; i < 10000000UL; i++); + } +} + +/* Set CPU affinity to a specific core */ +static void set_affinity(int cpu) +{ + cpu_set_t mask; + + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); + if (sched_setaffinity(0, sizeof(mask), &mask) != 0) { + perror("sched_setaffinity"); + exit(EXIT_FAILURE); + } +} + +/* Set task scheduling policy and priority */ +static void set_sched(int policy, int priority) +{ + struct sched_param param; + + param.sched_priority = priority; + if (sched_setscheduler(0, policy, &param) != 0) { + perror("sched_setscheduler"); + exit(EXIT_FAILURE); + } +} + +/* Get process runtime from /proc/<pid>/stat */ +static float get_process_runtime(int pid) +{ + char path[256]; + FILE *file; + long utime, stime; + int fields; + + snprintf(path, sizeof(path), "/proc/%d/stat", pid); + file = fopen(path, "r"); + if (file == NULL) { + perror("Failed to open stat file"); + return -1; + } + + /* Skip the first 13 fields and read the 14th and 15th */ + fields = fscanf(file, + "%*d %*s %*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u %lu %lu", + &utime, &stime); + fclose(file); + + if (fields != 2) { + fprintf(stderr, "Failed to read stat file\n"); + return -1; + } + + /* Calculate the total time spent in the process */ + long total_time = utime + stime; + long ticks_per_second = sysconf(_SC_CLK_TCK); + float runtime_seconds = total_time * 1.0 / ticks_per_second; + + return runtime_seconds; +} + +static enum scx_test_status setup(void **ctx) +{ + struct rt_stall *skel; + + skel = rt_stall__open(); + SCX_FAIL_IF(!skel, "Failed to open"); + SCX_ENUM_INIT(skel); + SCX_FAIL_IF(rt_stall__load(skel), "Failed to load skel"); + + *ctx = skel; + + return SCX_TEST_PASS; +} + +static bool sched_stress_test(void) +{ + float cfs_runtime, rt_runtime; + int cfs_pid, rt_pid; + float expected_min_ratio = 0.04; /* 4% */ + + ksft_print_header(); + ksft_set_plan(1); + + /* Create and set up a EXT task */ + cfs_pid = fork(); + if (cfs_pid == 0) { + set_affinity(CORE_ID); + process_func(); + exit(0); + } else if (cfs_pid < 0) { + perror("fork for EXT task"); + ksft_exit_fail(); + } + + /* Create an RT task */ + rt_pid = fork(); + if (rt_pid == 0) { + set_affinity(CORE_ID); + set_sched(SCHED_FIFO, 50); + process_func(); + exit(0); + } else if (rt_pid < 0) { + perror("fork for RT task"); + ksft_exit_fail(); + } + + /* Let the processes run for the specified time */ + sleep(RUN_TIME); + + /* Get runtime for the EXT task */ + cfs_runtime = get_process_runtime(cfs_pid); + if (cfs_runtime != -1) + ksft_print_msg("Runtime of EXT task (PID %d) is %f seconds\n", cfs_pid, cfs_runtime); + else + ksft_exit_fail_msg("Error getting runtime for EXT task (PID %d)\n", cfs_pid); + + /* Get runtime for the RT task */ + rt_runtime = get_process_runtime(rt_pid); + if (rt_runtime != -1) + ksft_print_msg("Runtime of RT task (PID %d) is %f seconds\n", rt_pid, rt_runtime); + else + ksft_exit_fail_msg("Error getting runtime for RT task (PID %d)\n", rt_pid); + + /* Kill the processes */ + kill(cfs_pid, SIGKILL); + kill(rt_pid, SIGKILL); + waitpid(cfs_pid, NULL, 0); + waitpid(rt_pid, NULL, 0); + + /* Verify that the scx task got enough runtime */ + float actual_ratio = cfs_runtime / (cfs_runtime + rt_runtime); + ksft_print_msg("EXT task got %.2f%% of total runtime\n", actual_ratio * 100); + + if (actual_ratio >= expected_min_ratio) { + ksft_test_result_pass("PASS: EXT task got more than %.2f%% of runtime\n", + expected_min_ratio * 100); + return true; + } else { + ksft_test_result_fail("FAIL: EXT task got less than %.2f%% of runtime\n", + expected_min_ratio * 100); + return false; + } +} + +static enum scx_test_status run(void *ctx) +{ + struct rt_stall *skel = ctx; + struct bpf_link *link; + bool res; + + link = bpf_map__attach_struct_ops(skel->maps.rt_stall_ops); + SCX_FAIL_IF(!link, "Failed to attach scheduler"); + + res = sched_stress_test(); + + SCX_EQ(skel->data->uei.kind, EXIT_KIND(SCX_EXIT_NONE)); + bpf_link__destroy(link); + + if (!res) + ksft_exit_fail(); + + return SCX_TEST_PASS; +} + +static void cleanup(void *ctx) +{ + struct rt_stall *skel = ctx; + + rt_stall__destroy(skel); +} + +struct scx_test rt_stall = { + .name = "rt_stall", + .description = "Verify that RT tasks cannot stall SCHED_EXT tasks", + .setup = setup, + .run = run, + .cleanup = cleanup, +}; +REGISTER_SCX_TEST(&rt_stall) -- 2.43.0

5 months, 3 weeks

1
0
0 0

[PATCH bpf-next v4 1/2] bpftool: Use appropriate permissions for map access

by Slava Imameev

Modify several functions in tools/bpf/bpftool/common.c to allow specification of requested access for file descriptors, such as read-only access. Update bpftool to request only read access for maps when write access is not required. This fixes errors when reading from maps that are protected from modification via security_bpf_map. Signed-off-by: Slava Imameev <slava.imameev(a)crowdstrike.com> --- Changes in v2: - fix for a test compilation error: "conflicting types for 'bpf_fentry_test1'" Changes in v3: - Addressed review feedback - Converted the check for flags to an assert in map_parse_fds - Modified map_fd_by_name to keep an existing fd where possible - Fixed requested access for map delete command in do_delete - Changed requested access to RDONLY for inner map fd in do_create - Changed requested access to RDONLY for iterator fd in do_pin Changes in v4: - Explicitly included assert.h in common.c - Added read only access to map in build_btf_type_table --- tools/bpf/bpftool/btf.c --- tools/bpf/bpftool/btf.c | 8 +++-- tools/bpf/bpftool/common.c | 59 ++++++++++++++++++++++--------- tools/bpf/bpftool/iter.c | 2 +- tools/bpf/bpftool/link.c | 2 +- tools/bpf/bpftool/main.h | 13 ++++--- tools/bpf/bpftool/map.c | 56 +++++++++++++++++------------ tools/bpf/bpftool/map_perf_ring.c | 3 +- tools/bpf/bpftool/prog.c | 4 +-- 8 files changed, 96 insertions(+), 51 deletions(-) diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c index 6b14cbfa58aa..946612029dee 100644 --- a/tools/bpf/bpftool/btf.c +++ b/tools/bpf/bpftool/btf.c @@ -905,7 +905,8 @@ static int do_dump(int argc, char **argv) return -1; } - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, + BPF_F_RDONLY); if (fd < 0) return -1; @@ -1118,10 +1119,13 @@ build_btf_type_table(struct hashmap *tab, enum bpf_obj_type type, [BPF_OBJ_PROG] = "prog", [BPF_OBJ_MAP] = "map", }; + LIBBPF_OPTS(bpf_get_fd_by_id_opts, opts_ro); __u32 btf_id, id = 0; int err; int fd; + opts_ro.open_flags = BPF_F_RDONLY; + while (true) { switch (type) { case BPF_OBJ_PROG: @@ -1151,7 +1155,7 @@ build_btf_type_table(struct hashmap *tab, enum bpf_obj_type type, fd = bpf_prog_get_fd_by_id(id); break; case BPF_OBJ_MAP: - fd = bpf_map_get_fd_by_id(id); + fd = bpf_map_get_fd_by_id_opts(id, &opts_ro); break; default: err = -1; diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index ecfa790adc13..b07317d2842f 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -4,6 +4,7 @@ #ifndef _GNU_SOURCE #define _GNU_SOURCE #endif +#include <assert.h> #include <ctype.h> #include <errno.h> #include <fcntl.h> @@ -193,7 +194,8 @@ int mount_tracefs(const char *target) return err; } -int open_obj_pinned(const char *path, bool quiet) +int open_obj_pinned(const char *path, bool quiet, + const struct bpf_obj_get_opts *opts) { char *pname; int fd = -1; @@ -205,7 +207,7 @@ int open_obj_pinned(const char *path, bool quiet) goto out_ret; } - fd = bpf_obj_get(pname); + fd = bpf_obj_get_opts(pname, opts); if (fd < 0) { if (!quiet) p_err("bpf obj get (%s): %s", pname, @@ -221,12 +223,13 @@ int open_obj_pinned(const char *path, bool quiet) return fd; } -int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type) +int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type, + const struct bpf_obj_get_opts *opts) { enum bpf_obj_type type; int fd; - fd = open_obj_pinned(path, false); + fd = open_obj_pinned(path, false, opts); if (fd < 0) return -1; @@ -555,7 +558,7 @@ static int do_build_table_cb(const char *fpath, const struct stat *sb, if (typeflag != FTW_F) goto out_ret; - fd = open_obj_pinned(fpath, true); + fd = open_obj_pinned(fpath, true, NULL); if (fd < 0) goto out_ret; @@ -928,7 +931,7 @@ int prog_parse_fds(int *argc, char ***argv, int **fds) path = **argv; NEXT_ARGP(); - (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG); + (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_PROG, NULL); if ((*fds)[0] < 0) return -1; return 1; @@ -965,7 +968,8 @@ int prog_parse_fd(int *argc, char ***argv) return fd; } -static int map_fd_by_name(char *name, int **fds) +static int map_fd_by_name(char *name, int **fds, + const struct bpf_get_fd_by_id_opts *opts) { unsigned int id = 0; int fd, nb_fds = 0; @@ -973,6 +977,7 @@ static int map_fd_by_name(char *name, int **fds) int err; while (true) { + LIBBPF_OPTS(bpf_get_fd_by_id_opts, opts_ro); struct bpf_map_info info = {}; __u32 len = sizeof(info); @@ -985,7 +990,9 @@ static int map_fd_by_name(char *name, int **fds) return nb_fds; } - fd = bpf_map_get_fd_by_id(id); + /* Request a read-only fd to query the map info */ + opts_ro.open_flags = BPF_F_RDONLY; + fd = bpf_map_get_fd_by_id_opts(id, &opts_ro); if (fd < 0) { p_err("can't get map by id (%u): %s", id, strerror(errno)); @@ -1004,6 +1011,19 @@ static int map_fd_by_name(char *name, int **fds) continue; } + /* Get an fd with the requested options, if they differ + * from the read-only options used to get the fd above. + */ + if (memcmp(opts, &opts_ro, sizeof(opts_ro))) { + close(fd); + fd = bpf_map_get_fd_by_id_opts(id, opts); + if (fd < 0) { + p_err("can't get map by id (%u): %s", id, + strerror(errno)); + goto err_close_fds; + } + } + if (nb_fds > 0) { tmp = realloc(*fds, (nb_fds + 1) * sizeof(int)); if (!tmp) { @@ -1023,8 +1043,13 @@ static int map_fd_by_name(char *name, int **fds) return -1; } -int map_parse_fds(int *argc, char ***argv, int **fds) +int map_parse_fds(int *argc, char ***argv, int **fds, __u32 open_flags) { + LIBBPF_OPTS(bpf_get_fd_by_id_opts, opts); + + assert((open_flags & ~BPF_F_RDONLY) == 0); + opts.open_flags = open_flags; + if (is_prefix(**argv, "id")) { unsigned int id; char *endptr; @@ -1038,7 +1063,7 @@ int map_parse_fds(int *argc, char ***argv, int **fds) } NEXT_ARGP(); - (*fds)[0] = bpf_map_get_fd_by_id(id); + (*fds)[0] = bpf_map_get_fd_by_id_opts(id, &opts); if ((*fds)[0] < 0) { p_err("get map by id (%u): %s", id, strerror(errno)); return -1; @@ -1056,16 +1081,18 @@ int map_parse_fds(int *argc, char ***argv, int **fds) } NEXT_ARGP(); - return map_fd_by_name(name, fds); + return map_fd_by_name(name, fds, &opts); } else if (is_prefix(**argv, "pinned")) { char *path; + LIBBPF_OPTS(bpf_obj_get_opts, get_opts); + get_opts.file_flags = open_flags; NEXT_ARGP(); path = **argv; NEXT_ARGP(); - (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP); + (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP, &get_opts); if ((*fds)[0] < 0) return -1; return 1; @@ -1075,7 +1102,7 @@ int map_parse_fds(int *argc, char ***argv, int **fds) return -1; } -int map_parse_fd(int *argc, char ***argv) +int map_parse_fd(int *argc, char ***argv, __u32 open_flags) { int *fds = NULL; int nb_fds, fd; @@ -1085,7 +1112,7 @@ int map_parse_fd(int *argc, char ***argv) p_err("mem alloc failed"); return -1; } - nb_fds = map_parse_fds(argc, argv, &fds); + nb_fds = map_parse_fds(argc, argv, &fds, open_flags); if (nb_fds != 1) { if (nb_fds > 1) { p_err("several maps match this handle"); @@ -1103,12 +1130,12 @@ int map_parse_fd(int *argc, char ***argv) } int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info, - __u32 *info_len) + __u32 *info_len, __u32 open_flags) { int err; int fd; - fd = map_parse_fd(argc, argv); + fd = map_parse_fd(argc, argv, open_flags); if (fd < 0) return -1; diff --git a/tools/bpf/bpftool/iter.c b/tools/bpf/bpftool/iter.c index 5c39c2ed36a2..df5f0d1e07e8 100644 --- a/tools/bpf/bpftool/iter.c +++ b/tools/bpf/bpftool/iter.c @@ -37,7 +37,7 @@ static int do_pin(int argc, char **argv) return -1; } - map_fd = map_parse_fd(&argc, &argv); + map_fd = map_parse_fd(&argc, &argv, BPF_F_RDONLY); if (map_fd < 0) return -1; diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index 03513ffffb79..a773e05d5ade 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -117,7 +117,7 @@ static int link_parse_fd(int *argc, char ***argv) path = **argv; NEXT_ARGP(); - return open_obj_pinned_any(path, BPF_OBJ_LINK); + return open_obj_pinned_any(path, BPF_OBJ_LINK, NULL); } p_err("expected 'id' or 'pinned', got: '%s'?", **argv); diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index 9eb764fe4cc8..6db704fda5c0 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -15,6 +15,7 @@ #include <bpf/hashmap.h> #include <bpf/libbpf.h> +#include <bpf/bpf.h> #include "json_writer.h" @@ -140,8 +141,10 @@ void get_prog_full_name(const struct bpf_prog_info *prog_info, int prog_fd, int get_fd_type(int fd); const char *get_fd_type_name(enum bpf_obj_type type); char *get_fdinfo(int fd, const char *key); -int open_obj_pinned(const char *path, bool quiet); -int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type); +int open_obj_pinned(const char *path, bool quiet, + const struct bpf_obj_get_opts *opts); +int open_obj_pinned_any(const char *path, enum bpf_obj_type exp_type, + const struct bpf_obj_get_opts *opts); int mount_bpffs_for_file(const char *file_name); int create_and_mount_bpffs_dir(const char *dir_name); int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(int *, char ***)); @@ -167,10 +170,10 @@ int do_iter(int argc, char **argv) __weak; int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what); int prog_parse_fd(int *argc, char ***argv); int prog_parse_fds(int *argc, char ***argv, int **fds); -int map_parse_fd(int *argc, char ***argv); -int map_parse_fds(int *argc, char ***argv, int **fds); +int map_parse_fd(int *argc, char ***argv, __u32 open_flags); +int map_parse_fds(int *argc, char ***argv, int **fds, __u32 open_flags); int map_parse_fd_and_info(int *argc, char ***argv, struct bpf_map_info *info, - __u32 *info_len); + __u32 *info_len, __u32 open_flags); struct bpf_prog_linfo; #if defined(HAVE_LLVM_SUPPORT) || defined(HAVE_LIBBFD_SUPPORT) diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 81cc668b4b05..c9de44a45778 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -337,9 +337,9 @@ static void fill_per_cpu_value(struct bpf_map_info *info, void *value) memcpy(value + i * step, value, info->value_size); } -static int parse_elem(char **argv, struct bpf_map_info *info, - void *key, void *value, __u32 key_size, __u32 value_size, - __u32 *flags, __u32 **value_fd) +static int parse_elem(char **argv, struct bpf_map_info *info, void *key, + void *value, __u32 key_size, __u32 value_size, + __u32 *flags, __u32 **value_fd, __u32 open_flags) { if (!*argv) { if (!key && !value) @@ -362,7 +362,7 @@ static int parse_elem(char **argv, struct bpf_map_info *info, return -1; return parse_elem(argv, info, NULL, value, key_size, value_size, - flags, value_fd); + flags, value_fd, open_flags); } else if (is_prefix(*argv, "value")) { int fd; @@ -388,7 +388,7 @@ static int parse_elem(char **argv, struct bpf_map_info *info, return -1; } - fd = map_parse_fd(&argc, &argv); + fd = map_parse_fd(&argc, &argv, open_flags); if (fd < 0) return -1; @@ -424,7 +424,7 @@ static int parse_elem(char **argv, struct bpf_map_info *info, } return parse_elem(argv, info, key, NULL, key_size, value_size, - flags, NULL); + flags, NULL, open_flags); } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") || is_prefix(*argv, "exist")) { if (!flags) { @@ -440,7 +440,7 @@ static int parse_elem(char **argv, struct bpf_map_info *info, *flags = BPF_EXIST; return parse_elem(argv + 1, info, key, value, key_size, - value_size, NULL, value_fd); + value_size, NULL, value_fd, open_flags); } p_err("expected key or value, got: %s", *argv); @@ -639,7 +639,7 @@ static int do_show_subset(int argc, char **argv) p_err("mem alloc failed"); return -1; } - nb_fds = map_parse_fds(&argc, &argv, &fds); + nb_fds = map_parse_fds(&argc, &argv, &fds, BPF_F_RDONLY); if (nb_fds < 1) goto exit_free; @@ -672,12 +672,15 @@ static int do_show_subset(int argc, char **argv) static int do_show(int argc, char **argv) { + LIBBPF_OPTS(bpf_get_fd_by_id_opts, opts); struct bpf_map_info info = {}; __u32 len = sizeof(info); __u32 id = 0; int err; int fd; + opts.open_flags = BPF_F_RDONLY; + if (show_pinned) { map_table = hashmap__new(hash_fn_for_key_as_id, equal_fn_for_key_as_id, NULL); @@ -707,7 +710,7 @@ static int do_show(int argc, char **argv) break; } - fd = bpf_map_get_fd_by_id(id); + fd = bpf_map_get_fd_by_id_opts(id, &opts); if (fd < 0) { if (errno == ENOENT) continue; @@ -909,7 +912,7 @@ static int do_dump(int argc, char **argv) p_err("mem alloc failed"); return -1; } - nb_fds = map_parse_fds(&argc, &argv, &fds); + nb_fds = map_parse_fds(&argc, &argv, &fds, BPF_F_RDONLY); if (nb_fds < 1) goto exit_free; @@ -997,7 +1000,7 @@ static int do_update(int argc, char **argv) if (argc < 2) usage(); - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, 0); if (fd < 0) return -1; @@ -1006,7 +1009,7 @@ static int do_update(int argc, char **argv) goto exit_free; err = parse_elem(argv, &info, key, value, info.key_size, - info.value_size, &flags, &value_fd); + info.value_size, &flags, &value_fd, 0); if (err) goto exit_free; @@ -1076,7 +1079,7 @@ static int do_lookup(int argc, char **argv) if (argc < 2) usage(); - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, BPF_F_RDONLY); if (fd < 0) return -1; @@ -1084,7 +1087,8 @@ static int do_lookup(int argc, char **argv) if (err) goto exit_free; - err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL); + err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL, + BPF_F_RDONLY); if (err) goto exit_free; @@ -1127,7 +1131,7 @@ static int do_getnext(int argc, char **argv) if (argc < 2) usage(); - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, BPF_F_RDONLY); if (fd < 0) return -1; @@ -1140,8 +1144,8 @@ static int do_getnext(int argc, char **argv) } if (argc) { - err = parse_elem(argv, &info, key, NULL, info.key_size, 0, - NULL, NULL); + err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, + NULL, BPF_F_RDONLY); if (err) goto exit_free; } else { @@ -1198,7 +1202,7 @@ static int do_delete(int argc, char **argv) if (argc < 2) usage(); - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, 0); if (fd < 0) return -1; @@ -1209,7 +1213,8 @@ static int do_delete(int argc, char **argv) goto exit_free; } - err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL); + err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL, + 0); if (err) goto exit_free; @@ -1226,11 +1231,16 @@ static int do_delete(int argc, char **argv) return err; } +static int map_parse_read_only_fd(int *argc, char ***argv) +{ + return map_parse_fd(argc, argv, BPF_F_RDONLY); +} + static int do_pin(int argc, char **argv) { int err; - err = do_pin_any(argc, argv, map_parse_fd); + err = do_pin_any(argc, argv, map_parse_read_only_fd); if (!err && json_output) jsonw_null(json_wtr); return err; @@ -1319,7 +1329,7 @@ static int do_create(int argc, char **argv) if (!REQ_ARGS(2)) usage(); inner_map_fd = map_parse_fd_and_info(&argc, &argv, - &info, &len); + &info, &len, BPF_F_RDONLY); if (inner_map_fd < 0) return -1; attr.inner_map_fd = inner_map_fd; @@ -1368,7 +1378,7 @@ static int do_pop_dequeue(int argc, char **argv) if (argc < 2) usage(); - fd = map_parse_fd_and_info(&argc, &argv, &info, &len); + fd = map_parse_fd_and_info(&argc, &argv, &info, &len, 0); if (fd < 0) return -1; @@ -1407,7 +1417,7 @@ static int do_freeze(int argc, char **argv) if (!REQ_ARGS(2)) return -1; - fd = map_parse_fd(&argc, &argv); + fd = map_parse_fd(&argc, &argv, 0); if (fd < 0) return -1; diff --git a/tools/bpf/bpftool/map_perf_ring.c b/tools/bpf/bpftool/map_perf_ring.c index 552b4ca40c27..bcb767e2d673 100644 --- a/tools/bpf/bpftool/map_perf_ring.c +++ b/tools/bpf/bpftool/map_perf_ring.c @@ -128,7 +128,8 @@ int do_event_pipe(int argc, char **argv) int err, map_fd; map_info_len = sizeof(map_info); - map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len); + map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len, + 0); if (map_fd < 0) return -1; diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 96eea8a67225..deeaa5c1ed7d 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -1062,7 +1062,7 @@ static int parse_attach_detach_args(int argc, char **argv, int *progfd, if (!REQ_ARGS(2)) return -EINVAL; - *mapfd = map_parse_fd(&argc, &argv); + *mapfd = map_parse_fd(&argc, &argv, 0); if (*mapfd < 0) return *mapfd; @@ -1608,7 +1608,7 @@ static int load_with_options(int argc, char **argv, bool first_prog_only) } NEXT_ARG(); - fd = map_parse_fd(&argc, &argv); + fd = map_parse_fd(&argc, &argv, 0); if (fd < 0) goto err_free_reuse_maps; -- 2.34.1

5 months, 3 weeks

3
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[RESEND PATCH v13 3/3] selftests/rseq: Add test for mm_cid compaction

by Gabriele Monaco

A task in the kernel (task_mm_cid_work) runs somewhat periodically to compact the mm_cid for each process. Add a test to validate that it runs correctly and timely. The test spawns 1 thread pinned to each CPU, then each thread, including the main one, runs in short bursts for some time. During this period, the mm_cids should be spanning all numbers between 0 and nproc. At the end of this phase, a thread with high enough mm_cid (>= nproc/2) is selected to be the new leader, all other threads terminate. After some time, the only running thread should see 0 as mm_cid, if that doesn't happen, the compaction mechanism didn't work and the test fails. The test never fails if only 1 core is available, in which case, we cannot test anything as the only available mm_cid is 0. Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers(a)efficios.com> Signed-off-by: Gabriele Monaco <gmonaco(a)redhat.com> --- tools/testing/selftests/rseq/.gitignore | 1 + tools/testing/selftests/rseq/Makefile | 2 +- .../selftests/rseq/mm_cid_compaction_test.c | 200 ++++++++++++++++++ 3 files changed, 202 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/rseq/mm_cid_compaction_test.c diff --git a/tools/testing/selftests/rseq/.gitignore b/tools/testing/selftests/rseq/.gitignore index 0fda241fa62b0..b3920c59bf401 100644 --- a/tools/testing/selftests/rseq/.gitignore +++ b/tools/testing/selftests/rseq/.gitignore @@ -3,6 +3,7 @@ basic_percpu_ops_test basic_percpu_ops_mm_cid_test basic_test basic_rseq_op_test +mm_cid_compaction_test param_test param_test_benchmark param_test_compare_twice diff --git a/tools/testing/selftests/rseq/Makefile b/tools/testing/selftests/rseq/Makefile index 0d0a5fae59547..bc4d940f66d40 100644 --- a/tools/testing/selftests/rseq/Makefile +++ b/tools/testing/selftests/rseq/Makefile @@ -17,7 +17,7 @@ OVERRIDE_TARGETS = 1 TEST_GEN_PROGS = basic_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test param_test \ param_test_benchmark param_test_compare_twice param_test_mm_cid \ param_test_mm_cid_benchmark param_test_mm_cid_compare_twice \ - syscall_errors_test + syscall_errors_test mm_cid_compaction_test TEST_GEN_PROGS_EXTENDED = librseq.so diff --git a/tools/testing/selftests/rseq/mm_cid_compaction_test.c b/tools/testing/selftests/rseq/mm_cid_compaction_test.c new file mode 100644 index 0000000000000..7ddde3b657dd6 --- /dev/null +++ b/tools/testing/selftests/rseq/mm_cid_compaction_test.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: LGPL-2.1 +#define _GNU_SOURCE +#include <assert.h> +#include <pthread.h> +#include <sched.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <stddef.h> + +#include "../kselftest.h" +#include "rseq.h" + +#define VERBOSE 0 +#define printf_verbose(fmt, ...) \ + do { \ + if (VERBOSE) \ + printf(fmt, ##__VA_ARGS__); \ + } while (0) + +/* 0.5 s */ +#define RUNNER_PERIOD 500000 +/* Number of runs before we terminate or get the token */ +#define THREAD_RUNS 5 + +/* + * Number of times we check that the mm_cid were compacted. + * Checks are repeated every RUNNER_PERIOD. + */ +#define MM_CID_COMPACT_TIMEOUT 10 + +struct thread_args { + int cpu; + int num_cpus; + pthread_mutex_t *token; + pthread_barrier_t *barrier; + pthread_t *tinfo; + struct thread_args *args_head; +}; + +static void __noreturn *thread_runner(void *arg) +{ + struct thread_args *args = arg; + int i, ret, curr_mm_cid; + cpu_set_t cpumask; + + CPU_ZERO(&cpumask); + CPU_SET(args->cpu, &cpumask); + ret = pthread_setaffinity_np(pthread_self(), sizeof(cpumask), &cpumask); + if (ret) { + errno = ret; + perror("Error: failed to set affinity"); + abort(); + } + pthread_barrier_wait(args->barrier); + + for (i = 0; i < THREAD_RUNS; i++) + usleep(RUNNER_PERIOD); + curr_mm_cid = rseq_current_mm_cid(); + /* + * We select one thread with high enough mm_cid to be the new leader. + * All other threads (including the main thread) will terminate. + * After some time, the mm_cid of the only remaining thread should + * converge to 0, if not, the test fails. + */ + if (curr_mm_cid >= args->num_cpus / 2 && + !pthread_mutex_trylock(args->token)) { + printf_verbose( + "cpu%d has mm_cid=%d and will be the new leader.\n", + sched_getcpu(), curr_mm_cid); + for (i = 0; i < args->num_cpus; i++) { + if (args->tinfo[i] == pthread_self()) + continue; + ret = pthread_join(args->tinfo[i], NULL); + if (ret) { + errno = ret; + perror("Error: failed to join thread"); + abort(); + } + } + pthread_barrier_destroy(args->barrier); + free(args->tinfo); + free(args->token); + free(args->barrier); + free(args->args_head); + + for (i = 0; i < MM_CID_COMPACT_TIMEOUT; i++) { + curr_mm_cid = rseq_current_mm_cid(); + printf_verbose("run %d: mm_cid=%d on cpu%d.\n", i, + curr_mm_cid, sched_getcpu()); + if (curr_mm_cid == 0) + exit(EXIT_SUCCESS); + usleep(RUNNER_PERIOD); + } + exit(EXIT_FAILURE); + } + printf_verbose("cpu%d has mm_cid=%d and is going to terminate.\n", + sched_getcpu(), curr_mm_cid); + pthread_exit(NULL); +} + +int test_mm_cid_compaction(void) +{ + cpu_set_t affinity; + int i, j, ret = 0, num_threads; + pthread_t *tinfo; + pthread_mutex_t *token; + pthread_barrier_t *barrier; + struct thread_args *args; + + sched_getaffinity(0, sizeof(affinity), &affinity); + num_threads = CPU_COUNT(&affinity); + tinfo = calloc(num_threads, sizeof(*tinfo)); + if (!tinfo) { + perror("Error: failed to allocate tinfo"); + return -1; + } + args = calloc(num_threads, sizeof(*args)); + if (!args) { + perror("Error: failed to allocate args"); + ret = -1; + goto out_free_tinfo; + } + token = malloc(sizeof(*token)); + if (!token) { + perror("Error: failed to allocate token"); + ret = -1; + goto out_free_args; + } + barrier = malloc(sizeof(*barrier)); + if (!barrier) { + perror("Error: failed to allocate barrier"); + ret = -1; + goto out_free_token; + } + if (num_threads == 1) { + fprintf(stderr, "Cannot test on a single cpu. " + "Skipping mm_cid_compaction test.\n"); + /* only skipping the test, this is not a failure */ + goto out_free_barrier; + } + pthread_mutex_init(token, NULL); + ret = pthread_barrier_init(barrier, NULL, num_threads); + if (ret) { + errno = ret; + perror("Error: failed to initialise barrier"); + goto out_free_barrier; + } + for (i = 0, j = 0; i < CPU_SETSIZE && j < num_threads; i++) { + if (!CPU_ISSET(i, &affinity)) + continue; + args[j].num_cpus = num_threads; + args[j].tinfo = tinfo; + args[j].token = token; + args[j].barrier = barrier; + args[j].cpu = i; + args[j].args_head = args; + if (!j) { + /* The first thread is the main one */ + tinfo[0] = pthread_self(); + ++j; + continue; + } + ret = pthread_create(&tinfo[j], NULL, thread_runner, &args[j]); + if (ret) { + errno = ret; + perror("Error: failed to create thread"); + abort(); + } + ++j; + } + printf_verbose("Started %d threads.\n", num_threads); + + /* Also main thread will terminate if it is not selected as leader */ + thread_runner(&args[0]); + + /* only reached in case of errors */ +out_free_barrier: + free(barrier); +out_free_token: + free(token); +out_free_args: + free(args); +out_free_tinfo: + free(tinfo); + + return ret; +} + +int main(int argc, char **argv) +{ + if (!rseq_mm_cid_available()) { + fprintf(stderr, "Error: rseq_mm_cid unavailable\n"); + return -1; + } + if (test_mm_cid_compaction()) + return -1; + return 0; +} -- 2.49.0

5 months, 3 weeks

3
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