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Thu, 16 Apr 2026 06:23:03 +0000 (GMT) Received: from localhost.localdomain (unknown [9.43.69.136]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP for ; Thu, 16 Apr 2026 06:23:03 +0000 (GMT) From: Sachin Sant To: ltp@lists.linux.it Date: Thu, 16 Apr 2026 11:53:02 +0530 Message-Id: <20260416062302.15804-1-sachinp@linux.ibm.com> X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: uPWDA3LTATqn2DZHzfKqKrzuepKOauHP X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE2MDA1NyBTYWx0ZWRfX104w52WgTKh+ Sc0Uc5cfq/EGZ/p+uiCY9OP/SSZWT/HADq/U+6A3KPhK30gvdO9A2LoxqKi5GjqKgfX43BkzcPL SqYpVURmMT4SQYf+8Mu/nhmvbsaM9D/r7Gy3mZCNvt409Q6rECSury49YKzw+0dVUWb5S2OQ1F5 15GMBsJRjuNghUmhs0kIsRPvfzwFFFFIsIJAvQVv2XH06oegUiYgux7u7Qy2R0VbtL1zC43D420 BVekbgqz3k4lhGU7eMcLNR0liP48Iknj7t5PYS8J93nEP1fCCd6QIUkl7w7i7KbniNUPxlKrCWa TJI2FHdNjaP4TnJ1DpiNQq7/JIDEdI3iemh6gI92lmRpFaZ1DJ+ay3WhemvmJ0Fxw5LTFKFdAA1 Y2ZvqPf4b+ZExbTcmOakK0SrF/EsZpock+GqYC59XCNL3HvYjPdW9kO0hDHVNeh8WqFryT1ege6 jNG1cE4ZhFYYxqcPhbA== X-Proofpoint-ORIG-GUID: uPWDA3LTATqn2DZHzfKqKrzuepKOauHP X-Authority-Analysis: v=2.4 cv=FY4HAp+6 c=1 sm=1 tr=0 ts=69e0804b cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=p1uXUT2nn1jiVixas2kA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-16_01,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604160057 X-Virus-Scanned: clamav-milter 1.0.9 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v4] io_uring: Add test for READV and WRITEV operations X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Add a test to validate vectored read and write operations using io_uring. 1. IORING_OP_WRITEV - Writing data using multiple buffers (scatter) 2. IORING_OP_READV - Reading data into multiple buffers (gather) 3. Data integrity verification across multiple iovecs 4. Edge cases with different iovec configurations including zero buffer length Additionally merge io_uring_init_buffer_pattern() into unified init_iovec_buffers() function that supports both rotating and simple character patterns Signed-off-by: Sachin Sant --- V4 changes: - Updated commit message to remove references to non-existent function - Removed extra blank line before test_writev_readv() - Link to v3 https://lore.kernel.org/ltp/20260416042531.81093-1-sachinp@linux.ibm.com/T/ V3 changes (2/3 io_uring04 only): - 1/3 and 3/3 from the patch series already merged. - Merged prepare_read_buffers() and clear_iovec_buffers() into single clear_iovec_buffers() function - Merged io_uring_init_buffer_pattern() into unified init_iovec_buffers() function that supports both rotating and simple character patterns - Removed io_uring_init_buffer_pattern() from io_uring_common.h as it's only used in io_uring04.c - Link to V2: https://lore.kernel.org/ltp/b4653e3f-ac9b-4a24-8d3f-51677c488e8c@linux.ibm.com/T/ V2 changes: - Use guarded buffer(including iovec) allocation - Move setup/cleanup code from run to appropriate path - Add a function to map the OP to the enum name - Define and use generic cleanup functions - Add a buffer size 0 in the middle of the iovec - Simplify setup_io_uring_test to use common code. - Link to V1: https://lore.kernel.org/ltp/20260320124742.75946-1-sachinp@linux.ibm.com/T/#t Changes after RFC patch series: - Addressed review comments - Refactored io_uring01 test to use common code - Removed git tags - Link to RFC: https://lore.kernel.org/ltp/20260318110328.52031-1-sachinp@linux.ibm.com/T/#t --- runtest/syscalls | 1 + testcases/kernel/syscalls/io_uring/.gitignore | 1 + .../kernel/syscalls/io_uring/io_uring04.c | 221 ++++++++++++++++++ .../syscalls/io_uring/io_uring_common.h | 13 -- 4 files changed, 223 insertions(+), 13 deletions(-) create mode 100644 testcases/kernel/syscalls/io_uring/io_uring04.c diff --git a/runtest/syscalls b/runtest/syscalls index 5025b259f..aa7a91d97 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -1901,6 +1901,7 @@ membarrier01 membarrier01 io_uring01 io_uring01 io_uring02 io_uring02 io_uring03 io_uring03 +io_uring04 io_uring04 # Tests below may cause kernel memory leak perf_event_open03 perf_event_open03 diff --git a/testcases/kernel/syscalls/io_uring/.gitignore b/testcases/kernel/syscalls/io_uring/.gitignore index 9382ae413..36cd24662 100644 --- a/testcases/kernel/syscalls/io_uring/.gitignore +++ b/testcases/kernel/syscalls/io_uring/.gitignore @@ -1,3 +1,4 @@ /io_uring01 /io_uring02 /io_uring03 +/io_uring04 diff --git a/testcases/kernel/syscalls/io_uring/io_uring04.c b/testcases/kernel/syscalls/io_uring/io_uring04.c new file mode 100644 index 000000000..7ff0b194f --- /dev/null +++ b/testcases/kernel/syscalls/io_uring/io_uring04.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 IBM + * Author: Sachin Sant + */ +/*\ + * Test IORING_OP_READV and IORING_OP_WRITEV operations. + * + * This test validates vectored read and write operations using io_uring. + * It tests: + * 1. IORING_OP_WRITEV - Writing data using multiple buffers (scatter) + * 2. IORING_OP_READV - Reading data into multiple buffers (gather) + * 3. Data integrity verification across multiple iovecs + * 4. Edge cases with different iovec configurations + */ + +#include "io_uring_common.h" + +#define TEST_FILE "io_uring_test_file" +#define QUEUE_DEPTH 2 +#define NUM_VECS 4 +#define VEC_SIZE 1024 +#define VAR_BUF1_SIZE 512 +#define VAR_BUF2_SIZE 1024 +#define VAR_BUF3_SIZE 256 + +static struct iovec *write_iovs, *read_iovs; +static struct iovec *var_write_iovs, *var_read_iovs; +static struct io_uring_submit s; +static sigset_t sig; + +/* + * Initialize iovec buffers with pattern + * @iovs: array of iovec structures + * @nvecs: number of iovecs + * @base_char: base character for pattern + * @use_rotating: if true, use rotating pattern; if false, use simple repeat + */ +static void init_iovec_buffers(struct iovec *iovs, int nvecs, + char base_char, int use_rotating) +{ + int i; + size_t j; + char *buf; + + for (i = 0; i < nvecs; i++) { + if (iovs[i].iov_len == 0) + continue; + + buf = (char *)iovs[i].iov_base; + if (use_rotating) { + /* Each vector has a different rotating pattern */ + for (j = 0; j < iovs[i].iov_len; j++) + buf[j] = base_char + i + (j % 26); + } else { + for (j = 0; j < iovs[i].iov_len; j++) + buf[j] = base_char + i; + } + } +} + +static void clear_iovec_buffers(struct iovec *iovs, int nvecs) +{ + int i; + + for (i = 0; i < nvecs; i++) + memset(iovs[i].iov_base, 0, iovs[i].iov_len); +} + +static void verify_iovec_data(struct iovec *write_iovs, struct iovec *read_iovs, + int nvecs, const char *test_name) +{ + int i; + size_t j; + + for (i = 0; i < nvecs; i++) { + if (write_iovs[i].iov_len != read_iovs[i].iov_len) { + tst_res(TFAIL, "%s: iovec %d length mismatch: write=%zu read=%zu", + test_name, i, write_iovs[i].iov_len, read_iovs[i].iov_len); + return; + } + + if (memcmp(write_iovs[i].iov_base, read_iovs[i].iov_base, + write_iovs[i].iov_len) != 0) { + tst_res(TFAIL, "%s: data mismatch in vector %d", test_name, i); + for (j = 0; j < write_iovs[i].iov_len && j < 64; j++) { + char *wbuf = (char *)write_iovs[i].iov_base; + char *rbuf = (char *)read_iovs[i].iov_base; + if (wbuf[j] != rbuf[j]) { + tst_res(TINFO, "Vector %d: first mismatch at " + "offset %zu: wrote 0x%02x, read 0x%02x", + i, j, wbuf[j], rbuf[j]); + break; + } + } + return; + } + } + + tst_res(TPASS, "%s: data integrity verified across %d vectors", + test_name, nvecs); +} + +static void test_writev_readv(void) +{ + int fd; + int total_size = NUM_VECS * VEC_SIZE; + + tst_res(TINFO, "Testing IORING_OP_WRITEV and IORING_OP_READV"); + + fd = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT | O_TRUNC, 0644); + + tst_res(TINFO, "Writing %d bytes using %d vectors", total_size, NUM_VECS); + io_uring_do_vec_io_op(&s, fd, IORING_OP_WRITEV, write_iovs, NUM_VECS, + 0, total_size, &sig); + + SAFE_FSYNC(fd); + + tst_res(TINFO, "Reading %d bytes using %d vectors", total_size, NUM_VECS); + io_uring_do_vec_io_op(&s, fd, IORING_OP_READV, read_iovs, NUM_VECS, + 0, total_size, &sig); + + verify_iovec_data(write_iovs, read_iovs, NUM_VECS, "Basic vectored I/O"); + + SAFE_CLOSE(fd); +} + +static void test_partial_vectors(void) +{ + int fd; + int half_size = 2 * VEC_SIZE; + + tst_res(TINFO, "Testing partial vector operations"); + + fd = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT | O_TRUNC, 0644); + + /* Write first half using first 2 vectors at offset 0 */ + io_uring_do_vec_io_op(&s, fd, IORING_OP_WRITEV, write_iovs, 2, 0, + half_size, &sig); + + /* Write second half using next 2 vectors at offset half_size */ + io_uring_do_vec_io_op(&s, fd, IORING_OP_WRITEV, &write_iovs[2], 2, + half_size, half_size, &sig); + + SAFE_FSYNC(fd); + + /* Read back entire file using all 4 vectors */ + io_uring_do_vec_io_op(&s, fd, IORING_OP_READV, read_iovs, NUM_VECS, 0, + NUM_VECS * VEC_SIZE, &sig); + + verify_iovec_data(write_iovs, read_iovs, NUM_VECS, "Partial vector I/O"); + + SAFE_CLOSE(fd); +} + +static void test_varying_sizes(void) +{ + int fd; + int expected_size = VAR_BUF1_SIZE + VAR_BUF2_SIZE + VAR_BUF3_SIZE; + + tst_res(TINFO, "Testing vectors with varying sizes including zero-length buffer"); + + init_iovec_buffers(var_write_iovs, 4, 'X', 0); + + clear_iovec_buffers(var_read_iovs, 4); + + fd = SAFE_OPEN(TEST_FILE, O_RDWR | O_CREAT | O_TRUNC, 0644); + + io_uring_do_vec_io_op(&s, fd, IORING_OP_WRITEV, var_write_iovs, 4, 0, + expected_size, &sig); + + SAFE_FSYNC(fd); + + io_uring_do_vec_io_op(&s, fd, IORING_OP_READV, var_read_iovs, 4, 0, + expected_size, &sig); + + verify_iovec_data(var_write_iovs, var_read_iovs, 4, "Varying size vector I/O with zero-length buffer"); + + SAFE_CLOSE(fd); +} + +static void run(void) +{ + test_writev_readv(); + test_partial_vectors(); + test_varying_sizes(); +} + +static void setup(void) +{ + io_uring_setup_supported_by_kernel(); + sigemptyset(&sig); + memset(&s, 0, sizeof(s)); + io_uring_setup_queue(&s, QUEUE_DEPTH, 0); + init_iovec_buffers(write_iovs, NUM_VECS, 'A', 1); + clear_iovec_buffers(read_iovs, NUM_VECS); +} + +static void cleanup(void) +{ + io_uring_cleanup_queue(&s, QUEUE_DEPTH); +} + +static struct tst_test test = { + .test_all = run, + .setup = setup, + .cleanup = cleanup, + .needs_tmpdir = 1, + .bufs = (struct tst_buffers []) { + {&write_iovs, .iov_sizes = (int[]){VEC_SIZE, VEC_SIZE, VEC_SIZE, VEC_SIZE, -1}}, + {&read_iovs, .iov_sizes = (int[]){VEC_SIZE, VEC_SIZE, VEC_SIZE, VEC_SIZE, -1}}, + {&var_write_iovs, .iov_sizes = (int[]){VAR_BUF1_SIZE, 0, VAR_BUF2_SIZE, VAR_BUF3_SIZE, -1}}, + {&var_read_iovs, .iov_sizes = (int[]){VAR_BUF1_SIZE, 0, VAR_BUF2_SIZE, VAR_BUF3_SIZE, -1}}, + {} + }, + .save_restore = (const struct tst_path_val[]) { + {"/proc/sys/kernel/io_uring_disabled", "0", + TST_SR_SKIP_MISSING | TST_SR_TCONF_RO}, + {} + } +}; diff --git a/testcases/kernel/syscalls/io_uring/io_uring_common.h b/testcases/kernel/syscalls/io_uring/io_uring_common.h index aa31339fb..7816b55dc 100644 --- a/testcases/kernel/syscalls/io_uring/io_uring_common.h +++ b/testcases/kernel/syscalls/io_uring/io_uring_common.h @@ -230,19 +230,6 @@ static inline void io_uring_wait_cqe(struct io_uring_submit *s, *cring->head = head + 1; } -/* - * Initialize buffer with a repeating character pattern - * Useful for creating test data with predictable patterns - */ -static inline void io_uring_init_buffer_pattern(char *buf, size_t size, - char pattern) -{ - size_t i; - - for (i = 0; i < size; i++) - buf[i] = pattern; -} - /* * Submit and wait for a non-vectored I/O operation * Combines io_uring_submit_sqe() and io_uring_wait_cqe() with result reporting -- 2.39.1 -- Mailing list info: https://lists.linux.it/listinfo/ltp