- Linux-kselftest-mirror - lists.linaro.org

Testing Quality Call notes - 2024-07-11

by Laura Nao

Hello, KernelCI is hosting a bi-weekly call on Thursday to discuss improvements to existing upstream tests, the development of new tests to increase kernel testing coverage, and the enablement of these tests in KernelCI. In recent months, we at Collabora have focused on various kernel areas, assessing the tests already available upstream and contributing patches to make them easily runnable in CIs. Below is a list of the tests we've been working on and their latest status updates, as discussed in the last meeting held on 2024-07-11: *USB/PCI devices kselftest* - Upstream test to detect unprobed devices on discoverable buses: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… - Updated KernelCI PRs according to feedback, now waiting for the first test results: https://github.com/kernelci/kernelci-core/pull/2577 and https://github.com/kernelci/kernelci-pipeline/pull/642 *Error log test* - Proposing new kselftest to report device log errors: https://lore.kernel.org/all/20240423-dev-err-log-selftest-v1-0-690c1741d68b… - Series got Acked-By from Greg, going to be picked up by Shuah soon - Feedback from Tim Bird: this series follows an unusual model where tests can only fail but never pass, as no test case is generated unless there is an error. It takes an unusual approach to detect regressions and fixes. The autogenerated test case names are not very descriptive. *Suspend/resume in cpufreq kselftest* - Enabling suspend/resume test within the cpufreq kselftest in KernelCI - - Sent patch upstream for adding RTC wakeup alarm in the cpufreq kselftest: https://lore.kernel.org/all/2e667d-668ff800-1-22d70300@133606496/ - Received a review from Rafael J. Wysocki, who suggested using the rtcwake utility instead of the sysfs entry *Boot time test* - Drafted initial implementation with two scripts, a config fragment and a bootconfig file - One script generates a YAML file containing initial timestamps for relevant boot events, parsed from the trace file (run once) - The other script is the actual test, which takes the generated YAML file and a delta in seconds as arguments. The script then parses the current trace file and checks if any timestamp deviates from the reference timestamps in the YAML file by more than the specified delta. - Tracking only a few functions at the moment (populate_rootfs, unpack_to_rootfs, run_init_process). Next steps: refine bootconfig file to include more tracepoints (potentially initcalls too?). Useful tracepoints should be discussed upstream. - Will present this at LPC 2024 (embedded and IoT MC) *Support for benchmark data in KTAP* - Tim Bird is working on adding performance data to KTAP output, which can be used in tests to detect slowdowns - The idea is to keep reference values and criteria separate from the test itself - There is a need to store per-platform files with previous times for comparison - Will need to figure out where these files can be stored so they can be shared and used by different people and systems. Potential options: KCIDB or https://github.com/kernelci/platform-test-parameters - Submitted a proposal for LPC 2024 - Other related topics for discussion at LPC 2024 include: how to avoid device tree overhead in the boot process and boot phases (time-critical vs non-critical) *TAP conformance in kselftests* - Focusing on standardizing the way kernel's testing modules report results - Discussion ongoing upstream over patches converting tests to TAP: https://lore.kernel.org/all/fb305513-580a-4bac-a078-fe0170a6ffa2@linuxfound… and https://lore.kernel.org/all/6d82fa16-ed2e-41f1-a466-c752032b6f68@linuxfound… Please reply to this thread if you'd like to join the call or discuss any of the topics further. We look forward to collaborating with the community to improve upstream tests and expand coverage to more areas of interest within the kernel. Best regards, Laura Nao

9 months, 2 weeks

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[PATCH v7 4/4] KVM: riscv: selftests: Add Svade and Svadu Extension to get-reg-list test

by Yong-Xuan Wang

Update the get-reg-list test to test the Svade and Svadu Extensions are available for guest OS. Signed-off-by: Yong-Xuan Wang <yongxuan.wang(a)sifive.com> Reviewed-by: Andrew Jones <ajones(a)ventanamicro.com> --- tools/testing/selftests/kvm/riscv/get-reg-list.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/testing/selftests/kvm/riscv/get-reg-list.c b/tools/testing/selftests/kvm/riscv/get-reg-list.c index 222198dd6d04..1d32351ad55e 100644 --- a/tools/testing/selftests/kvm/riscv/get-reg-list.c +++ b/tools/testing/selftests/kvm/riscv/get-reg-list.c @@ -45,6 +45,8 @@ bool filter_reg(__u64 reg) case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SSAIA: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SSCOFPMF: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SSTC: + case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SVADE: + case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SVADU: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SVINVAL: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SVNAPOT: case KVM_REG_RISCV_ISA_EXT | KVM_REG_RISCV_ISA_SINGLE | KVM_RISCV_ISA_EXT_SVPBMT: @@ -411,6 +413,8 @@ static const char *isa_ext_single_id_to_str(__u64 reg_off) KVM_ISA_EXT_ARR(SSAIA), KVM_ISA_EXT_ARR(SSCOFPMF), KVM_ISA_EXT_ARR(SSTC), + KVM_ISA_EXT_ARR(SVADE), + KVM_ISA_EXT_ARR(SVADU), KVM_ISA_EXT_ARR(SVINVAL), KVM_ISA_EXT_ARR(SVNAPOT), KVM_ISA_EXT_ARR(SVPBMT), @@ -935,6 +939,8 @@ KVM_ISA_EXT_SIMPLE_CONFIG(h, H); KVM_ISA_EXT_SUBLIST_CONFIG(smstateen, SMSTATEEN); KVM_ISA_EXT_SIMPLE_CONFIG(sscofpmf, SSCOFPMF); KVM_ISA_EXT_SIMPLE_CONFIG(sstc, SSTC); +KVM_ISA_EXT_SIMPLE_CONFIG(svade, SVADE); +KVM_ISA_EXT_SIMPLE_CONFIG(svadu, SVADU); KVM_ISA_EXT_SIMPLE_CONFIG(svinval, SVINVAL); KVM_ISA_EXT_SIMPLE_CONFIG(svnapot, SVNAPOT); KVM_ISA_EXT_SIMPLE_CONFIG(svpbmt, SVPBMT); @@ -991,6 +997,8 @@ struct vcpu_reg_list *vcpu_configs[] = { &config_smstateen, &config_sscofpmf, &config_sstc, + &config_svade, + &config_svadu, &config_svinval, &config_svnapot, &config_svpbmt, -- 2.17.1

9 months, 2 weeks

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[PATCH v2] selftests: x86: conform test to TAP format output

by Muhammad Usama Anjum

Conform the layout, informational and status messages to TAP. No functional change is intended other than the layout of output messages. Signed-off-by: Muhammad Usama Anjum <usama.anjum(a)collabora.com> --- Changes since v1: - No changes, sending it again as got no response on v1 even after weeks --- tools/testing/selftests/x86/vdso_restorer.c | 29 +++++++++------------ 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/tools/testing/selftests/x86/vdso_restorer.c b/tools/testing/selftests/x86/vdso_restorer.c index fe99f24341554..f621167424a9c 100644 --- a/tools/testing/selftests/x86/vdso_restorer.c +++ b/tools/testing/selftests/x86/vdso_restorer.c @@ -21,6 +21,7 @@ #include <unistd.h> #include <syscall.h> #include <sys/syscall.h> +#include "../kselftest.h" /* Open-code this -- the headers are too messy to easily use them. */ struct real_sigaction { @@ -44,17 +45,19 @@ static void handler_without_siginfo(int sig) int main() { - int nerrs = 0; struct real_sigaction sa; + ksft_print_header(); + ksft_set_plan(2); + void *vdso = dlopen("linux-vdso.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); if (!vdso) vdso = dlopen("linux-gate.so.1", RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); if (!vdso) { - printf("[SKIP]\tFailed to find vDSO. Tests are not expected to work.\n"); - return 0; + ksft_print_msg("[SKIP]\tFailed to find vDSO. Tests are not expected to work.\n"); + return KSFT_SKIP; } memset(&sa, 0, sizeof(sa)); @@ -62,21 +65,16 @@ int main() sa.flags = SA_SIGINFO; sa.restorer = NULL; /* request kernel-provided restorer */ - printf("[RUN]\tRaise a signal, SA_SIGINFO, sa.restorer == NULL\n"); + ksft_print_msg("Raise a signal, SA_SIGINFO, sa.restorer == NULL\n"); if (syscall(SYS_rt_sigaction, SIGUSR1, &sa, NULL, 8) != 0) err(1, "raw rt_sigaction syscall"); raise(SIGUSR1); - if (handler_called) { - printf("[OK]\tSA_SIGINFO handler returned successfully\n"); - } else { - printf("[FAIL]\tSA_SIGINFO handler was not called\n"); - nerrs++; - } + ksft_test_result(handler_called, "SA_SIGINFO handler returned\n"); - printf("[RUN]\tRaise a signal, !SA_SIGINFO, sa.restorer == NULL\n"); + ksft_print_msg("Raise a signal, !SA_SIGINFO, sa.restorer == NULL\n"); sa.flags = 0; sa.handler = handler_without_siginfo; @@ -86,10 +84,7 @@ int main() raise(SIGUSR1); - if (handler_called) { - printf("[OK]\t!SA_SIGINFO handler returned successfully\n"); - } else { - printf("[FAIL]\t!SA_SIGINFO handler was not called\n"); - nerrs++; - } + ksft_test_result(handler_called, "SA_SIGINFO handler returned\n"); + + ksft_finished(); } -- 2.39.2

9 months, 2 weeks

2
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[PATCH v2 0/3] kunit: Improve the readability and functionality of macro

by Eric Chan

This series let kunit macro more neat and clear. Fix comment and rename the macro. Also introduce new type of assertion marco for functionality. This is a follow-up to [0](v1). v1 -> v2: [PATCH 2/3] changed KUNIT_ASSERT to KUNIT_FAIL_AND_ABORT [0] https://lore.kernel.org/lkml/20240710170448.1399967-1-ericchancf@google.com/ Eric Chan (3): kunit: Fix the comment of KUNIT_ASSERT_STRNEQ as assertion kunit: Rename KUNIT_ASSERT_FAILURE to KUNIT_FAIL_AND_ABORT for readability kunit: Introduce KUNIT_ASSERT_MEMEQ and KUNIT_ASSERT_MEMNEQ macros drivers/input/tests/input_test.c | 2 +- include/kunit/assert.h | 2 +- include/kunit/test.h | 71 ++++++++++++++++++++++++++++++-- 3 files changed, 70 insertions(+), 5 deletions(-) -- 2.45.2.993.g49e7a77208-goog

9 months, 2 weeks

2
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[RESEND bpf-next v2] selftests/bpf:fix a resource leak

by Zhu Jun

The requested resources should be closed before return in main(), otherwise resource leak will occur Signed-off-by: Zhu Jun <zhujun2(a)cmss.chinamobile.com> --- Changes in v2: - check for cg_fd >= 0 and have just one out label tools/testing/selftests/bpf/test_sockmap.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c index a34e95040994..285a9a714666 100644 --- a/tools/testing/selftests/bpf/test_sockmap.c +++ b/tools/testing/selftests/bpf/test_sockmap.c @@ -2075,8 +2075,10 @@ int main(int argc, char **argv) if (!cg_fd) { cg_fd = cgroup_setup_and_join(CG_PATH); - if (cg_fd < 0) - return cg_fd; + if (cg_fd < 0) { + err = cg_fd; + goto out; + } cg_created = 1; } @@ -2092,7 +2094,7 @@ int main(int argc, char **argv) if (err) { fprintf(stderr, "populate program: (%s) %s\n", bpf_file, strerror(errno)); - return 1; + goto out; } running = 1; @@ -2109,7 +2111,8 @@ int main(int argc, char **argv) free(options.whitelist); if (options.blacklist) free(options.blacklist); - close(cg_fd); + if (cg_fd >= 0) + close(cg_fd); if (cg_created) cleanup_cgroup_environment(); return err; -- 2.17.1

9 months, 2 weeks

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[PATCH v2] selftests:Fix printf format string in kselftest_harness.h

by Zhu Jun

'%u' in format string requires 'unsigned int' in __wait_for_test() but the argument type is 'signed int' that this problem was discovered by reading code Signed-off-by: Zhu Jun <zhujun2(a)cmss.chinamobile.com> --- Changes in v2: - modify commit info add how to find the problem in the log tools/testing/selftests/kselftest_harness.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h index b634969cbb6f..dbbbcc6c04ee 100644 --- a/tools/testing/selftests/kselftest_harness.h +++ b/tools/testing/selftests/kselftest_harness.h @@ -1084,7 +1084,7 @@ void __wait_for_test(struct __test_metadata *t) } } else { fprintf(TH_LOG_STREAM, - "# %s: Test ended in some other way [%u]\n", + "# %s: Test ended in some other way [%d]\n", t->name, status); } -- 2.17.1

9 months, 2 weeks

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[PATCH net-next v2] selftests: openvswitch: retry instead of sleep

by Adrian Moreno

There are a couple of places where the test script "sleep"s to wait for some external condition to be met. This is error prone, specially in slow systems (identified in CI by "KSFT_MACHINE_SLOW=yes"). To fix this, add a "ovs_wait" function that tries to execute a command a few times until it succeeds. The timeout used is set to 5s for "normal" systems and doubled if a slow CI machine is detected. This should make the following work: $ vng --build \ --config tools/testing/selftests/net/config \ --config kernel/configs/debug.config $ vng --run . --user root -- "make -C tools/testing/selftests/ \ KSFT_MACHINE_SLOW=yes TARGETS=net/openvswitch run_tests" Signed-off-by: Adrian Moreno <amorenoz(a)redhat.com> --- .../selftests/net/openvswitch/openvswitch.sh | 45 +++++++++++++++---- .../selftests/net/openvswitch/ovs-dpctl.py | 1 + 2 files changed, 38 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh index bc71dbc18b21..cc0bfae2bafa 100755 --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh @@ -11,6 +11,11 @@ ksft_skip=4 PAUSE_ON_FAIL=no VERBOSE=0 TRACING=0 +WAIT_TIMEOUT=5 + +if test "X$KSFT_MACHINE_SLOW" == "Xyes"; then + WAIT_TIMEOUT=10 +fi tests=" arp_ping eth-arp: Basic arp ping between two NS @@ -29,6 +34,30 @@ info() { [ $VERBOSE = 0 ] || echo $* } +ovs_wait() { + info "waiting $WAIT_TIMEOUT s for: $@" + + if "$@" ; then + info "wait succeeded immediately" + return 0 + fi + + # A quick re-check helps speed up small races in fast systems. + # However, fractional sleeps might not necessarily work. + local start=0 + sleep 0.1 || { sleep 1; start=1; } + + for (( i=start; i<WAIT_TIMEOUT; i++ )); do + if "$@" ; then + info "wait succeeded after $i seconds" + return 0 + fi + sleep 1 + done + info "wait failed after $i seconds" + return 1 +} + ovs_base=`pwd` sbxs= sbx_add () { @@ -278,20 +307,19 @@ test_psample() { # Record psample data. ovs_spawn_daemon "test_psample" python3 $ovs_base/ovs-dpctl.py psample-events + ovs_wait grep -q "listening for psample events" ${ovs_dir}/stdout # Send a single ping. - sleep 1 ovs_sbx "test_psample" ip netns exec client ping -I c1 172.31.110.20 -c 1 || return 1 - sleep 1 # We should have received one userspace action upcall and 2 psample packets. - grep -E "userspace action command" $ovs_dir/s0.out >/dev/null 2>&1 || return 1 + ovs_wait grep -q "userspace action command" $ovs_dir/s0.out || return 1 # client -> server samples should only contain the first 14 bytes of the packet. - grep -E "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \ - $ovs_dir/stdout >/dev/null 2>&1 || return 1 - grep -E "rate:4294967295,group:2,cookie:eeff0c" \ - $ovs_dir/stdout >/dev/null 2>&1 || return 1 + ovs_wait grep -qE "rate:4294967295,group:1,cookie:c0ffee data:[0-9a-f]{28}$" \ + $ovs_dir/stdout || return 1 + + ovs_wait grep -q "rate:4294967295,group:2,cookie:eeff0c" $ovs_dir/stdout || return 1 return 0 } @@ -711,7 +739,8 @@ test_upcall_interfaces() { ovs_add_netns_and_veths "test_upcall_interfaces" ui0 upc left0 l0 \ 172.31.110.1/24 -u || return 1 - sleep 1 + ovs_wait grep -q "listening on upcall packet handler" ${ovs_dir}/left0.out + info "sending arping" ip netns exec upc arping -I l0 172.31.110.20 -c 1 \ >$ovs_dir/arping.stdout 2>$ovs_dir/arping.stderr diff --git a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py index 1e15b0818074..8a0396bfaf99 100644 --- a/tools/testing/selftests/net/openvswitch/ovs-dpctl.py +++ b/tools/testing/selftests/net/openvswitch/ovs-dpctl.py @@ -2520,6 +2520,7 @@ class PsampleEvent(EventSocket): marshal_class = psample_msg def read_samples(self): + print("listening for psample events", flush=True) while True: try: for msg in self.get(): -- 2.45.2

9 months, 2 weeks

5
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[PATCH bpf-next 0/5] use network helpers, part 9

by Geliang Tang

From: Geliang Tang <tanggeliang(a)kylinos.cn> This is the 9th part of series "use network helpers" all BPF selftests wide. Patches 1-2 update network helpers interfaces suggested by Martin. Patch 3 adds a new helper connect_to_addr_str() as Martin suggested instead of adding connect_fd_to_addr_str(). Patch 4 uses this newly added helper in make_client(). Patch 5 uses make_client() in sk_lookup and drop make_socket(). Geliang Tang (5): selftests/bpf: Drop type of connect_to_fd_opts selftests/bpf: Drop must_fail from network_helper_opts selftests/bpf: Add connect_to_addr_str helper selftests/bpf: Use connect_to_addr_str in sk_lookup selftests/bpf: Drop make_socket in sk_lookup tools/testing/selftests/bpf/network_helpers.c | 67 +++++++-------- tools/testing/selftests/bpf/network_helpers.h | 5 +- .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 2 +- .../selftests/bpf/prog_tests/cgroup_v1v2.c | 10 +-- .../selftests/bpf/prog_tests/sk_lookup.c | 84 ++++--------------- 5 files changed, 53 insertions(+), 115 deletions(-) -- 2.43.0

9 months, 2 weeks

2
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kselftest/next build: 1 build: 0 failed, 1 passed (v6.10-rc7-33-gbb408dae9e73)

by kernelci.org bot

kselftest/next build: 1 build: 0 failed, 1 passed (v6.10-rc7-33-gbb408dae9e73) Full Build Summary: https://kernelci.org/build/kselftest/branch/next/kernel/v6.10-rc7-33-gbb408… Tree: kselftest Branch: next Git Describe: v6.10-rc7-33-gbb408dae9e73 Git Commit: bb408dae9e73803eab8a648115d6c4a1bca4dba3 Git URL: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git Built: 1 unique architecture ================================================================================ Detailed per-defconfig build reports: -------------------------------------------------------------------------------- i386_defconfig+kselftest (i386, gcc-12) — PASS, 0 errors, 0 warnings, 0 section mismatches --- For more info write to <info(a)kernelci.org>

9 months, 2 weeks

1
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[PATCH net-next v16 00/13] Device Memory TCP

by Mina Almasry

v16: https://patchwork.kernel.org/project/netdevbpf/list/?series=866353&state=* ==== v15 got a thorough review and some testing, and this version addresses almost all the feedback. Some more minor comments where the authors said it could be done later, I left out. Major changes: - Addition of dma-buf introspection to page-pool-get and queue-get. - Fixes to selftests suggested by Taehee. - Fixes to documentation suggested by Donald. - A couple of suggestions and fixes to TCP patches by Eric and David. - Fixes to number assignements suggested by Arnd. - Use rtnl_lock()ing to guard against queue reconfiguration while the page_pool initialization is happening. (Jakub). - Fixes to a few warnings reproduced by Taehee. - Fixes to dma-buf binding suggested by Taehee and Jakub. - Fixes to netlink UAPI suggested by Jakub - Applied a number of Reviewed-bys and Acked-bys (including ones I lost from v13+). Full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v16/ One caveat: Taehee reproduced a KASAN warning and reported it here: https://lore.kernel.org/netdev/CAMArcTUdCxOBYGF3vpbq=eBvqZfnc44KBaQTN7H-wqd… I estimate the issue to be minor and easily fixable: https://lore.kernel.org/netdev/CAHS8izNgaqC--GGE2xd85QB=utUnOHmioCsDd1TNxJW… I hope to be able to follow up with a fix to net tree as net-next closes imminently, but if this iteration doesn't make it in, I will repost with a fix squashed after net-next reopens, no problem. v15: https://patchwork.kernel.org/project/netdevbpf/list/?series=865481&state=* ==== No material changes in this version, only a fix to linking against libynl.a from the last version. Per Jakub's instructions I've pulled one of his patches into this series, and now use the new libynl.a correctly, I hope. As usual, the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v15/ v14: https://patchwork.kernel.org/project/netdevbpf/list/?series=865135&archive=… ==== No material changes in this version. Only rebase and re-verification on top of net-next. v13, I think, raced with commit ebad6d0334793 ("net/ipv4: Use nested-BH locking for ipv4_tcp_sk.") being merged to net-next that caused a patchwork failure to apply. This series should apply cleanly on commit c4532232fa2a4 ("selftests: net: remove unneeded IP_GRE config"). I did not wait the customary 24hr as Jakub said it's OK to repost as soon as I build test the rebased version: https://lore.kernel.org/netdev/20240625075926.146d769d@kernel.org/ v13: https://patchwork.kernel.org/project/netdevbpf/list/?series=861406&archive=… ==== Major changes: -------------- This iteration addresses Pavel's review comments, applies his reviewed-by's, and seeks to fix the patchwork build error (sorry!). As usual, the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v13/ v12: https://patchwork.kernel.org/project/netdevbpf/list/?series=859747&state=* ==== Major changes: -------------- This iteration only addresses one minor comment from Pavel with regards to the trace printing of netmem, and the patchwork build error introduced in v11 because I missed doing an allmodconfig build, sorry. Other than that v11, AFAICT, received no feedback. There is one discussion about how the specifics of plugging io uring memory through the page pool, but not relevant to content in this particular patchset, AFAICT. As usual, the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v12/ v11: https://patchwork.kernel.org/project/netdevbpf/list/?series=857457&state=* ==== Major Changes: -------------- v11 addresses feedback received in v10. The major change is the removal of the memory provider ops as requested by Christoph. We still accomplish the same thing, but utilizing direct function calls with if statements rather than generic ops. Additionally address sparse warnings, bugs and review comments from folks that reviewed. As usual, the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v11/ Detailed changelog: ------------------- - Fixes in netdev_rx_queue_restart() from Pavel & David. - Remove commit e650e8c3a36f5 ("net: page_pool: create hooks for custom page providers") from the series to address Christoph's feedback and rebased other patches on the series on this change. - Fixed build errors with CONFIG_DMA_SHARED_BUFFER && !CONFIG_GENERIC_ALLOCATOR build. - Fixed sparse warnings pointed out by Paolo. - Drop unnecessary gro_pull_from_frag0 checks. - Added Bagas reviewed-by to docs. Cc: Bagas Sanjaya <bagasdotme(a)gmail.com> Cc: Steven Rostedt <rostedt(a)goodmis.org> Cc: Christoph Hellwig <hch(a)infradead.org> Cc: Nikolay Aleksandrov <razor(a)blackwall.org> Cc: Taehee Yoo <ap420073(a)gmail.com> Cc: Donald Hunter <donald.hunter(a)gmail.com> v10: https://patchwork.kernel.org/project/netdevbpf/list/?series=852422&state=* ==== Major Changes: -------------- v9 was sent right before the merge window closed (sorry!). v10 is almost a re-send of the series now that the merge window re-opened. Only rebased to latest net-next and addressed some minor iterative comments received on v9. As usual, the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v10/ Detailed changelog: ------------------- - Fixed tokens leaking in DONTNEED setsockopt (Nikolay). - Moved net_iov_dma_addr() to devmem.c and made it a devmem specific helpers (David). - Rename hook alloc_pages to alloc_netmems as alloc_pages is now preprocessor macro defined and causes a build error. v9: === Major Changes: -------------- GVE queue API has been merged. Submitting this version as non-RFC after rebasing on top of the merged API, and dropped the out of tree queue API I was carrying on github. Addressed the little feedback v8 has received. Detailed changelog: ------------------ - Added new patch from David Wei to this series for netdev_rx_queue_restart() - Fixed sparse error. - Removed CONFIG_ checks in netmem_is_net_iov() - Flipped skb->readable to skb->unreadable - Minor fixes to selftests & docs. RFC v8: ======= Major Changes: -------------- - Fixed build error generated by patch-by-patch build. - Applied docs suggestions from Randy. RFC v7: ======= Major Changes: -------------- This revision largely rebases on top of net-next and addresses the feedback RFCv6 received from folks, namely Jakub, Yunsheng, Arnd, David, & Pavel. The series remains in RFC because the queue-API ndos defined in this series are not yet implemented. I have a GVE implementation I carry out of tree for my testing. A upstreamable GVE implementation is in the works. Aside from that, in my estimation all the patches are ready for review/merge. Please do take a look. As usual the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v7/ Detailed changelog: - Use admin-perm in netlink API. - Addressed feedback from Jakub with regards to netlink API implementation. - Renamed devmem.c functions to something more appropriate for that file. - Improve the performance seen through the page_pool benchmark. - Fix the value definition of all the SO_DEVMEM_* uapi. - Various fixes to documentation. Perf - page-pool benchmark: --------------------------- Improved performance of bench_page_pool_simple.ko tests compared to v6: https://pastebin.com/raw/v5dYRg8L net-next base: 8 cycle fast path. RFC v6: 10 cycle fast path. RFC v7: 9 cycle fast path. RFC v7 with CONFIG_DMA_SHARED_BUFFER disabled: 8 cycle fast path, same as baseline. Perf - Devmem TCP benchmark: --------------------- Perf is about the same regardless of the changes in v7, namely the removal of the static_branch_unlikely to improve the page_pool benchmark performance: 189/200gbps bi-directional throughput with RX devmem TCP and regular TCP TX i.e. ~95% line rate. RFC v6: ======= Major Changes: -------------- This revision largely rebases on top of net-next and addresses the little feedback RFCv5 received. The series remains in RFC because the queue-API ndos defined in this series are not yet implemented. I have a GVE implementation I carry out of tree for my testing. A upstreamable GVE implementation is in the works. Aside from that, in my estimation all the patches are ready for review/merge. Please do take a look. As usual the full devmem TCP changes including the full GVE driver implementation is here: https://github.com/mina/linux/commits/tcpdevmem-v6/ This version also comes with some performance data recorded in the cover letter (see below changelog). Detailed changelog: - Rebased on top of the merged netmem_ref changes. - Converted skb->dmabuf to skb->readable (Pavel). Pavel's original suggestion was to remove the skb->dmabuf flag entirely, but when I looked into it closely, I found the issue that if we remove the flag we have to dereference the shinfo(skb) pointer to obtain the first frag to tell whether an skb is readable or not. This can cause a performance regression if it dirties the cache line when the shinfo(skb) was not really needed. Instead, I converted the skb->dmabuf flag into a generic skb->readable flag which can be re-used by io_uring 0-copy RX. - Squashed a few locking optimizations from Eric Dumazet in the RX path and the DEVMEM_DONTNEED setsockopt. - Expanded the tests a bit. Added validation for invalid scenarios and added some more coverage. Perf - page-pool benchmark: --------------------------- bench_page_pool_simple.ko tests with and without these changes: https://pastebin.com/raw/ncHDwAbn AFAIK the number that really matters in the perf tests is the 'tasklet_page_pool01_fast_path Per elem'. This one measures at about 8 cycles without the changes but there is some 1 cycle noise in some results. With the patches this regresses to 9 cycles with the changes but there is 1 cycle noise occasionally running this test repeatedly. Lastly I tried disable the static_branch_unlikely() in netmem_is_net_iov() check. To my surprise disabling the static_branch_unlikely() check reduces the fast path back to 8 cycles, but the 1 cycle noise remains. Perf - Devmem TCP benchmark: --------------------- 189/200gbps bi-directional throughput with RX devmem TCP and regular TCP TX i.e. ~95% line rate. Major changes in RFC v5: ======================== 1. Rebased on top of 'Abstract page from net stack' series and used the new netmem type to refer to LSB set pointers instead of re-using struct page. 2. Downgraded this series back to RFC and called it RFC v5. This is because this series is now dependent on 'Abstract page from net stack'[1] and the queue API. Both are removed from the series to reduce the patch # and those bits are fairly independent or pre-requisite work. 3. Reworked the page_pool devmem support to use netmem and for some more unified handling. 4. Reworked the reference counting of net_iov (renamed from page_pool_iov) to use pp_ref_count for refcounting. The full changes including the dependent series and GVE page pool support is here: https://github.com/mina/linux/commits/tcpdevmem-rfcv5/ [1] https://patchwork.kernel.org/project/netdevbpf/list/?series=810774 Major changes in v1: ==================== 1. Implemented MVP queue API ndos to remove the userspace-visible driver reset. 2. Fixed issues in the napi_pp_put_page() devmem frag unref path. 3. Removed RFC tag. Many smaller addressed comments across all the patches (patches have individual change log). Full tree including the rest of the GVE driver changes: https://github.com/mina/linux/commits/tcpdevmem-v1 Changes in RFC v3: ================== 1. Pulled in the memory-provider dependency from Jakub's RFC[1] to make the series reviewable and mergeable. 2. Implemented multi-rx-queue binding which was a todo in v2. 3. Fix to cmsg handling. The sticking point in RFC v2[2] was the device reset required to refill the device rx-queues after the dmabuf bind/unbind. The solution suggested as I understand is a subset of the per-queue management ops Jakub suggested or similar: https://lore.kernel.org/netdev/20230815171638.4c057dcd@kernel.org/ This is not addressed in this revision, because: 1. This point was discussed at netconf & netdev and there is openness to using the current approach of requiring a device reset. 2. Implementing individual queue resetting seems to be difficult for my test bed with GVE. My prototype to test this ran into issues with the rx-queues not coming back up properly if reset individually. At the moment I'm unsure if it's a mistake in the POC or a genuine issue in the virtualization stack behind GVE, which currently doesn't test individual rx-queue restart. 3. Our usecases are not bothered by requiring a device reset to refill the buffer queues, and we'd like to support NICs that run into this limitation with resetting individual queues. My thought is that drivers that have trouble with per-queue configs can use the support in this series, while drivers that support new netdev ops to reset individual queues can automatically reset the queue as part of the dma-buf bind/unbind. The same approach with device resets is presented again for consideration with other sticking points addressed. This proposal includes the rx devmem path only proposed for merge. For a snapshot of my entire tree which includes the GVE POC page pool support & device memory support: https://github.com/torvalds/linux/compare/master...mina:linux:tcpdevmem-v3 [1] https://lore.kernel.org/netdev/f8270765-a27b-6ccf-33ea-cda097168d79@redhat.… [2] https://lore.kernel.org/netdev/CAHS8izOVJGJH5WF68OsRWFKJid1_huzzUK+hpKbLcL4… Changes in RFC v2: ================== The sticking point in RFC v1[1] was the dma-buf pages approach we used to deliver the device memory to the TCP stack. RFC v2 is a proof-of-concept that attempts to resolve this by implementing scatterlist support in the networking stack, such that we can import the dma-buf scatterlist directly. This is the approach proposed at a high level here[2]. Detailed changes: 1. Replaced dma-buf pages approach with importing scatterlist into the page pool. 2. Replace the dma-buf pages centric API with a netlink API. 3. Removed the TX path implementation - there is no issue with implementing the TX path with scatterlist approach, but leaving out the TX path makes it easier to review. 4. Functionality is tested with this proposal, but I have not conducted perf testing yet. I'm not sure there are regressions, but I removed perf claims from the cover letter until they can be re-confirmed. 5. Added Signed-off-by: contributors to the implementation. 6. Fixed some bugs with the RX path since RFC v1. Any feedback welcome, but specifically the biggest pending questions needing feedback IMO are: 1. Feedback on the scatterlist-based approach in general. 2. Netlink API (Patch 1 & 2). 3. Approach to handle all the drivers that expect to receive pages from the page pool (Patch 6). [1] https://lore.kernel.org/netdev/dfe4bae7-13a0-3c5d-d671-f61b375cb0b4@gmail.c… [2] https://lore.kernel.org/netdev/CAHS8izPm6XRS54LdCDZVd0C75tA1zHSu6jLVO8nzTLX… ================== * TL;DR: Device memory TCP (devmem TCP) is a proposal for transferring data to and/or from device memory efficiently, without bouncing the data to a host memory buffer. * Problem: A large amount of data transfers have device memory as the source and/or destination. Accelerators drastically increased the volume of such transfers. Some examples include: - ML accelerators transferring large amounts of training data from storage into GPU/TPU memory. In some cases ML training setup time can be as long as 50% of TPU compute time, improving data transfer throughput & efficiency can help improving GPU/TPU utilization. - Distributed training, where ML accelerators, such as GPUs on different hosts, exchange data among them. - Distributed raw block storage applications transfer large amounts of data with remote SSDs, much of this data does not require host processing. Today, the majority of the Device-to-Device data transfers the network are implemented as the following low level operations: Device-to-Host copy, Host-to-Host network transfer, and Host-to-Device copy. The implementation is suboptimal, especially for bulk data transfers, and can put significant strains on system resources, such as host memory bandwidth, PCIe bandwidth, etc. One important reason behind the current state is the kernel’s lack of semantics to express device to network transfers. * Proposal: In this patch series we attempt to optimize this use case by implementing socket APIs that enable the user to: 1. send device memory across the network directly, and 2. receive incoming network packets directly into device memory. Packet _payloads_ go directly from the NIC to device memory for receive and from device memory to NIC for transmit. Packet _headers_ go to/from host memory and are processed by the TCP/IP stack normally. The NIC _must_ support header split to achieve this. Advantages: - Alleviate host memory bandwidth pressure, compared to existing network-transfer + device-copy semantics. - Alleviate PCIe BW pressure, by limiting data transfer to the lowest level of the PCIe tree, compared to traditional path which sends data through the root complex. * Patch overview: ** Part 1: netlink API Gives user ability to bind dma-buf to an RX queue. ** Part 2: scatterlist support Currently the standard for device memory sharing is DMABUF, which doesn't generate struct pages. On the other hand, networking stack (skbs, drivers, and page pool) operate on pages. We have 2 options: 1. Generate struct pages for dmabuf device memory, or, 2. Modify the networking stack to process scatterlist. Approach #1 was attempted in RFC v1. RFC v2 implements approach #2. ** part 3: page pool support We piggy back on page pool memory providers proposal: https://github.com/kuba-moo/linux/tree/pp-providers It allows the page pool to define a memory provider that provides the page allocation and freeing. It helps abstract most of the device memory TCP changes from the driver. ** part 4: support for unreadable skb frags Page pool iovs are not accessible by the host; we implement changes throughput the networking stack to correctly handle skbs with unreadable frags. ** Part 5: recvmsg() APIs We define user APIs for the user to send and receive device memory. Not included with this series is the GVE devmem TCP support, just to simplify the review. Code available here if desired: https://github.com/mina/linux/tree/tcpdevmem This series is built on top of net-next with Jakub's pp-providers changes cherry-picked. * NIC dependencies: 1. (strict) Devmem TCP require the NIC to support header split, i.e. the capability to split incoming packets into a header + payload and to put each into a separate buffer. Devmem TCP works by using device memory for the packet payload, and host memory for the packet headers. 2. (optional) Devmem TCP works better with flow steering support & RSS support, i.e. the NIC's ability to steer flows into certain rx queues. This allows the sysadmin to enable devmem TCP on a subset of the rx queues, and steer devmem TCP traffic onto these queues and non devmem TCP elsewhere. The NIC I have access to with these properties is the GVE with DQO support running in Google Cloud, but any NIC that supports these features would suffice. I may be able to help reviewers bring up devmem TCP on their NICs. * Testing: The series includes a udmabuf kselftest that show a simple use case of devmem TCP and validates the entire data path end to end without a dependency on a specific dmabuf provider. ** Test Setup Kernel: net-next with this series and memory provider API cherry-picked locally. Hardware: Google Cloud A3 VMs. NIC: GVE with header split & RSS & flow steering support. Cc: Pavel Begunkov <asml.silence(a)gmail.com> Cc: David Wei <dw(a)davidwei.uk> Cc: Jason Gunthorpe <jgg(a)ziepe.ca> Cc: Yunsheng Lin <linyunsheng(a)huawei.com> Cc: Shailend Chand <shailend(a)google.com> Cc: Harshitha Ramamurthy <hramamurthy(a)google.com> Cc: Shakeel Butt <shakeel.butt(a)linux.dev> Cc: Jeroen de Borst <jeroendb(a)google.com> Cc: Praveen Kaligineedi <pkaligineedi(a)google.com> Mina Almasry (13): netdev: add netdev_rx_queue_restart() net: netdev netlink api to bind dma-buf to a net device netdev: support binding dma-buf to netdevice netdev: netdevice devmem allocator page_pool: devmem support memory-provider: dmabuf devmem memory provider net: support non paged skb frags net: add support for skbs with unreadable frags tcp: RX path for devmem TCP net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags net: add devmem TCP documentation selftests: add ncdevmem, netcat for devmem TCP netdev: add dmabuf introspection Documentation/netlink/specs/netdev.yaml | 61 +++ Documentation/networking/devmem.rst | 269 ++++++++++++ Documentation/networking/index.rst | 1 + arch/alpha/include/uapi/asm/socket.h | 6 + arch/mips/include/uapi/asm/socket.h | 6 + arch/parisc/include/uapi/asm/socket.h | 6 + arch/sparc/include/uapi/asm/socket.h | 6 + include/linux/skbuff.h | 61 ++- include/linux/skbuff_ref.h | 9 +- include/linux/socket.h | 1 + include/net/devmem.h | 123 ++++++ include/net/mp_dmabuf_devmem.h | 44 ++ include/net/netdev_rx_queue.h | 5 + include/net/netmem.h | 193 ++++++++- include/net/page_pool/helpers.h | 47 ++- include/net/page_pool/types.h | 8 + include/net/sock.h | 2 + include/net/tcp.h | 5 +- include/trace/events/page_pool.h | 8 +- include/uapi/asm-generic/socket.h | 6 + include/uapi/linux/netdev.h | 13 + include/uapi/linux/uio.h | 17 + net/core/Makefile | 3 +- net/core/datagram.c | 6 + net/core/dev.c | 6 +- net/core/devmem.c | 364 ++++++++++++++++ net/core/gro.c | 3 +- net/core/netdev-genl-gen.c | 23 + net/core/netdev-genl-gen.h | 6 + net/core/netdev-genl.c | 111 +++++ net/core/netdev_rx_queue.c | 74 ++++ net/core/page_pool.c | 96 +++-- net/core/page_pool_user.c | 4 + net/core/skbuff.c | 76 +++- net/core/sock.c | 68 +++ net/ipv4/esp4.c | 3 +- net/ipv4/tcp.c | 261 +++++++++++- net/ipv4/tcp_input.c | 13 +- net/ipv4/tcp_ipv4.c | 16 + net/ipv4/tcp_minisocks.c | 2 + net/ipv4/tcp_output.c | 5 +- net/ipv6/esp6.c | 3 +- net/packet/af_packet.c | 4 +- tools/include/uapi/linux/netdev.h | 13 + tools/testing/selftests/net/.gitignore | 1 + tools/testing/selftests/net/Makefile | 9 + tools/testing/selftests/net/ncdevmem.c | 536 ++++++++++++++++++++++++ 47 files changed, 2505 insertions(+), 98 deletions(-) create mode 100644 Documentation/networking/devmem.rst create mode 100644 include/net/devmem.h create mode 100644 include/net/mp_dmabuf_devmem.h create mode 100644 net/core/devmem.c create mode 100644 net/core/netdev_rx_queue.c create mode 100644 tools/testing/selftests/net/ncdevmem.c -- 2.45.2.803.g4e1b14247a-goog

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