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
ublk_fault_inject_tgt_init(const struct dev_ctx * ctx,struct ublk_dev * dev)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
ublk_fault_inject_queue_io(struct ublk_queue * q,int tag)41 static int ublk_fault_inject_queue_io(struct ublk_queue *q, int tag)
42 {
43 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag);
44 struct io_uring_sqe *sqe;
45 struct __kernel_timespec ts = {
46 .tv_nsec = (long long)q->dev->private_data,
47 };
48
49 ublk_io_alloc_sqes(ublk_get_io(q, tag), &sqe, 1);
50 io_uring_prep_timeout(sqe, &ts, 1, 0);
51 sqe->user_data = build_user_data(tag, ublksrv_get_op(iod), 0, q->q_id, 1);
52
53 ublk_queued_tgt_io(q, tag, 1);
54
55 return 0;
56 }
57
ublk_fault_inject_tgt_io_done(struct ublk_queue * q,int tag,const struct io_uring_cqe * cqe)58 static void ublk_fault_inject_tgt_io_done(struct ublk_queue *q, int tag,
59 const struct io_uring_cqe *cqe)
60 {
61 const struct ublksrv_io_desc *iod = ublk_get_iod(q, tag);
62
63 if (cqe->res != -ETIME)
64 ublk_err("%s: unexpected cqe res %d\n", __func__, cqe->res);
65
66 if (ublk_completed_tgt_io(q, tag))
67 ublk_complete_io(q, tag, iod->nr_sectors << 9);
68 else
69 ublk_err("%s: io not complete after 1 cqe\n", __func__);
70 }
71
ublk_fault_inject_cmd_line(struct dev_ctx * ctx,int argc,char * argv[])72 static void ublk_fault_inject_cmd_line(struct dev_ctx *ctx, int argc, char *argv[])
73 {
74 static const struct option longopts[] = {
75 { "delay_us", 1, NULL, 0 },
76 { 0, 0, 0, 0 }
77 };
78 int option_idx, opt;
79
80 ctx->fault_inject.delay_us = 0;
81 while ((opt = getopt_long(argc, argv, "",
82 longopts, &option_idx)) != -1) {
83 switch (opt) {
84 case 0:
85 if (!strcmp(longopts[option_idx].name, "delay_us"))
86 ctx->fault_inject.delay_us = strtoll(optarg, NULL, 10);
87 }
88 }
89 }
90
ublk_fault_inject_usage(const struct ublk_tgt_ops * ops)91 static void ublk_fault_inject_usage(const struct ublk_tgt_ops *ops)
92 {
93 printf("\tfault_inject: [--delay_us us (default 0)]\n");
94 }
95
96 const struct ublk_tgt_ops fault_inject_tgt_ops = {
97 .name = "fault_inject",
98 .init_tgt = ublk_fault_inject_tgt_init,
99 .queue_io = ublk_fault_inject_queue_io,
100 .tgt_io_done = ublk_fault_inject_tgt_io_done,
101 .parse_cmd_line = ublk_fault_inject_cmd_line,
102 .usage = ublk_fault_inject_usage,
103 };
104