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2025-03-22selftests: ublk: add stripe targetMing Lei
Add ublk stripe target which can take 1~4 underlying backing files or block device, with stripe size 4k ~ 512K. Add two basic tests(write verify & mkfs/mount/umount) over ublk/stripe. This target is helpful to cover multiple IOs aiming at same fixed/registered IO kernel buffer. It is also capable of verifying vectored registered (kernel)buffers in future for zero copy, so far it isn't supported yet. Todo: support vectored registered kernel buffer for ublk/zc. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-9-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: simplify loop io completionMing Lei
Use the added target io handling helpers for simplifying loop io completion. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-8-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: enable zero copy for null targetMing Lei
Enable zero copy for null target so that we can evaluate performance from zero copy or not. Also this should be the simplest ublk zero copy implementation, which can be served as zc example. Add test for covering 'add -t null -z'. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-7-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: prepare for supporting stripe targetMing Lei
- pass 'truct dev_ctx *ctx' to target init function - add 'private_data' to 'struct ublk_dev' for storing target specific data - add 'private_data' to 'struct ublk_io' for storing per-IO data - add 'tgt_ios' to 'struct ublk_io' for counting how many io_uring ios for handling the current io command - add helper ublk_get_io() for supporting stripe target - add two helpers for simplifying target io handling Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-6-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: move common code into common.cMing Lei
Move two functions for initializing & de-initializing backing file into common.c. Also move one common helper into kublk.h. Prepare for supporting ublk-stripe. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-5-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: increase max buffer size to 1MBMing Lei
Increase max buffer size to 1MB, and 64KB is too small to evaluate performance with builtin ublk server implementation. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: add single sqe allocator helperMing Lei
Unify the sqe allocator helper, and we will use it for supporting more cases, such as ublk stripe, in which variable sqe allocation is required. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-22selftests: ublk: add generic_01 for verifying sequential IO orderMing Lei
block layer, ublk and io_uring might re-order IO in the past - plug - queue ublk io command via task work Add one test for verifying if sequential WRITE IO is dispatched in order. - null target is taken, so we can just observe io order from `tracepoint:block:block_rq_complete` which represents the dispatch order - WRITE IO is taken because READ may come from system-wide utility Cc: Uday Shankar <ushankar@purestorage.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250322093218.431419-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-21selftests: ublk: fix starting ublk deviceMing Lei
Firstly ublk char device node may not be created by udev yet, so wait a while until it can be opened or timeout. Secondly delete created ublk device in case of start failure, otherwise the device becomes zombie. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250321135324.259677-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-20selftests: ublk: fix write cache implementationMing Lei
For loop target, write cache isn't enabled, and each write isn't be marked as DSYNC too. Fix it by enabling write cache, meantime fix FLUSH implementation by not taking LBA range into account, and there isn't such info for FLUSH command. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250321004758.152572-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-20selftests: ublk: add variable for user to not show test resultMing Lei
Some user decides test result by exit code only, and wouldn't like to be bothered by the test result. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250320013743.4167489-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-20selftests: ublk: don't show `modprobe` failureMing Lei
ublk_drv may be built-in, so don't show modprobe failure, and we do check `/dev/ublk-control` for skipping test if ublk_drv isn't enabled. Reported-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250320013743.4167489-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-20selftests: ublk: add one dependency headerMing Lei
Add one dependency helper which can include new uapi definition which isn't synced from kernel. This way also helps a lot for downstream test deployment. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250320013743.4167489-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: improve test usabilityMing Lei
Add UBLK_TEST_QUIET, so we can print test result(PASS/SKIP/FAIL) only. Also always run from test script's current directory, then the same test script can be started from other work directory. This way helps a lot to reuse this test source code and scripts for other projects(liburing, blktests, ...) Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-12-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: add stress test for covering IO vs. killing ublk serverMing Lei
Add stress_test_01 for running IO vs. killing ublk server, so io_uring exit & cancel code path can be covered, same with ublk's cancel code path. Especially IO buffer lifetime is one big thing for ublk zero copy, the added test can verify if this area works as expected. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-11-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: add one stress test for covering IO vs. removing deviceMing Lei
Add stress_test_01 for running IO vs. removing device for verifying that ublk device removal can work as expected when heavy IO workloads are in progress. null, loop and loop/zc are covered in this tests. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-10-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: load/unload ublk_drv when preparing & cleaning up testsMing Lei
Load ublk_drv module in _prep_test(), and unload it in _cleanup_test(), so that test can always be done in consistent state. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-9-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: move zero copy feature check into _add_ublk_dev()Ming Lei
Move zero copy feature check into _add_ublk_dev() since we will have more tests which requires to cover zero copy. Then one check function of _check_add_dev() has to be added for dealing with cleanup since '_add_ublk_dev()' is run in sub-shell, and we can't exit from it to terminal shell. Meantime always return error code from _add_ublk_dev(). Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-8-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: don't pass ${dev_id} to _cleanup_test()Ming Lei
More devices can be created in single tests, so simply remove all ublk devices in _cleanup_test(), meantime remove the ${dev_id} argument of _cleanup_test(). Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-7-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: support shellcheck and fix all warningMing Lei
Add shellcheck, meantime fixes all warnings. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250303124324.3563605-6-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: fix parsing '-a' argumentMing Lei
The argument of '-a' doesn't follow any value, so fix it by putting it with '-z' together. Fixes: bedc9cbc5f97 ("selftests: ublk: add ublk zero copy test") Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20250303124324.3563605-5-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: add --foreground command lineMing Lei
Add --foreground command for helping to debug. Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20250303124324.3563605-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: fix build failureMing Lei
Fixes the following build failure: ublk//file_backed.c: In function ‘backing_file_tgt_init’: ublk//file_backed.c:28:42: error: ‘O_DIRECT’ undeclared (first use in this function); did you mean ‘O_DIRECTORY’? 28 | fd = open(file, O_RDWR | O_DIRECT); | ^~~~~~~~ | O_DIRECTORY when trying to reuse this same utility for liburing test. Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20250303124324.3563605-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-03-10selftests: ublk: make ublk_stop_io_daemon() more reliableMing Lei
Improve ublk_stop_io_daemon() in the following ways: - don't wait if ->ublksrv_pid becomes -1, which means that the disk has been stopped - don't wait if ublk char device doesn't exist any more, so we can avoid to rely on inoitfy for wait until the char device is closed And this way may reduce time of delete command a lot. Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Link: https://lore.kernel.org/r/20250303124324.3563605-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-02-28selftests: ublk: add ublk zero copy testMing Lei
Enable zero copy on file backed target, meantime add one fio test for covering write verify, another test for mkfs/mount/umount. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250228161919.2869102-4-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-02-28selftests: ublk: add file backed ublkMing Lei
Add file backed ublk target code, meantime add one fio test for covering write verify, another test for mkfs/mount/umount. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250228161919.2869102-3-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2025-02-28selftests: ublk: add kernel selftests for ublkMing Lei
Both ublk driver and userspace heavily depends on io_uring subsystem, and tools/testing/selftests/ should be the best place for holding this cross-subsystem tests. Add basic read/write IO test over this ublk null disk, and make sure ublk working. More tests will be added. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250228161919.2869102-2-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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