1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Fault injection ublk target. Hack this up however you like for 5 * testing specific behaviors of ublk_drv. Currently is a null target 6 * with a configurable delay before completing each I/O. This delay can 7 * be used to test ublk_drv's handling of I/O outstanding to the ublk 8 * server when it dies. 9 */ 10 11 #include "kublk.h" 12 13 static int ublk_fault_inject_tgt_init(const struct dev_ctx *ctx, 14 struct ublk_dev *dev) 15 { 16 const struct ublksrv_ctrl_dev_info *info = &dev->dev_info; 17 unsigned long dev_size = 250UL << 30; 18 19 if (ctx->auto_zc_fallback) { 20 ublk_err("%s: not support auto_zc_fallback\n", __func__); 21 return -EINVAL; 22 } 23 24 dev->tgt.dev_size = dev_size; 25 dev->tgt.params = (struct ublk_params) { 26 .types = UBLK_PARAM_TYPE_BASIC, 27 .basic = { 28 .logical_bs_shift = 9, 29 .physical_bs_shift = 12, 30 .io_opt_shift = 12, 31 .io_min_shift = 9, 32 .max_sectors = info->max_io_buf_bytes >> 9, 33 .dev_sectors = dev_size >> 9, 34 }, 35 }; 36 37 dev->private_data = (void *)(unsigned long)(ctx->fault_inject.delay_us * 1000); 38 return 0; 39 } 40 41 static int ublk_fault_inject_queue_io(struct ublk_thread *t, 42 struct ublk_queue *q, int tag) 43 { 44 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag); 45 struct io_uring_sqe *sqe; 46 struct __kernel_timespec ts = { 47 .tv_nsec = (long long)q->dev->private_data, 48 }; 49 50 ublk_io_alloc_sqes(t, &sqe, 1); 51 io_uring_prep_timeout(sqe, &ts, 1, 0); 52 sqe->user_data = build_user_data(tag, ublksrv_get_op(iod), 0, q->q_id, 1); 53 54 ublk_queued_tgt_io(t, q, tag, 1); 55 56 return 0; 57 } 58 59 static void ublk_fault_inject_tgt_io_done(struct ublk_thread *t, 60 struct ublk_queue *q, 61 const struct io_uring_cqe *cqe) 62 { 63 unsigned tag = user_data_to_tag(cqe->user_data); 64 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag); 65 66 if (cqe->res != -ETIME) 67 ublk_err("%s: unexpected cqe res %d\n", __func__, cqe->res); 68 69 if (ublk_completed_tgt_io(t, q, tag)) 70 ublk_complete_io(t, q, tag, iod->nr_sectors << 9); 71 else 72 ublk_err("%s: io not complete after 1 cqe\n", __func__); 73 } 74 75 static void ublk_fault_inject_cmd_line(struct dev_ctx *ctx, int argc, char *argv[]) 76 { 77 static const struct option longopts[] = { 78 { "delay_us", 1, NULL, 0 }, 79 { 0, 0, 0, 0 } 80 }; 81 int option_idx, opt; 82 83 ctx->fault_inject.delay_us = 0; 84 while ((opt = getopt_long(argc, argv, "", 85 longopts, &option_idx)) != -1) { 86 switch (opt) { 87 case 0: 88 if (!strcmp(longopts[option_idx].name, "delay_us")) 89 ctx->fault_inject.delay_us = strtoll(optarg, NULL, 10); 90 } 91 } 92 } 93 94 static void ublk_fault_inject_usage(const struct ublk_tgt_ops *ops) 95 { 96 printf("\tfault_inject: [--delay_us us (default 0)]\n"); 97 } 98 99 const struct ublk_tgt_ops fault_inject_tgt_ops = { 100 .name = "fault_inject", 101 .init_tgt = ublk_fault_inject_tgt_init, 102 .queue_io = ublk_fault_inject_queue_io, 103 .tgt_io_done = ublk_fault_inject_tgt_io_done, 104 .parse_cmd_line = ublk_fault_inject_cmd_line, 105 .usage = ublk_fault_inject_usage, 106 }; 107