1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe Fabrics command implementation.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
5 */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/blkdev.h>
8 #include "nvmet.h"
9
nvmet_execute_prop_set(struct nvmet_req * req)10 static void nvmet_execute_prop_set(struct nvmet_req *req)
11 {
12 u64 val = le64_to_cpu(req->cmd->prop_set.value);
13 u16 status = 0;
14
15 if (!nvmet_check_transfer_len(req, 0))
16 return;
17
18 if (req->cmd->prop_set.attrib & 1) {
19 req->error_loc =
20 offsetof(struct nvmf_property_set_command, attrib);
21 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
22 goto out;
23 }
24
25 switch (le32_to_cpu(req->cmd->prop_set.offset)) {
26 case NVME_REG_CC:
27 nvmet_update_cc(req->sq->ctrl, val);
28 break;
29 default:
30 req->error_loc =
31 offsetof(struct nvmf_property_set_command, offset);
32 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
33 }
34 out:
35 nvmet_req_complete(req, status);
36 }
37
nvmet_execute_prop_get(struct nvmet_req * req)38 static void nvmet_execute_prop_get(struct nvmet_req *req)
39 {
40 struct nvmet_ctrl *ctrl = req->sq->ctrl;
41 u16 status = 0;
42 u64 val = 0;
43
44 if (!nvmet_check_transfer_len(req, 0))
45 return;
46
47 if (req->cmd->prop_get.attrib & 1) {
48 switch (le32_to_cpu(req->cmd->prop_get.offset)) {
49 case NVME_REG_CAP:
50 val = ctrl->cap;
51 break;
52 default:
53 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
54 break;
55 }
56 } else {
57 switch (le32_to_cpu(req->cmd->prop_get.offset)) {
58 case NVME_REG_VS:
59 val = ctrl->subsys->ver;
60 break;
61 case NVME_REG_CC:
62 val = ctrl->cc;
63 break;
64 case NVME_REG_CSTS:
65 val = ctrl->csts;
66 break;
67 default:
68 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
69 break;
70 }
71 }
72
73 if (status && req->cmd->prop_get.attrib & 1) {
74 req->error_loc =
75 offsetof(struct nvmf_property_get_command, offset);
76 } else {
77 req->error_loc =
78 offsetof(struct nvmf_property_get_command, attrib);
79 }
80
81 req->cqe->result.u64 = cpu_to_le64(val);
82 nvmet_req_complete(req, status);
83 }
84
nvmet_parse_fabrics_cmd(struct nvmet_req * req)85 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req)
86 {
87 struct nvme_command *cmd = req->cmd;
88
89 switch (cmd->fabrics.fctype) {
90 case nvme_fabrics_type_property_set:
91 req->execute = nvmet_execute_prop_set;
92 break;
93 case nvme_fabrics_type_property_get:
94 req->execute = nvmet_execute_prop_get;
95 break;
96 default:
97 pr_err("received unknown capsule type 0x%x\n",
98 cmd->fabrics.fctype);
99 req->error_loc = offsetof(struct nvmf_common_command, fctype);
100 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
101 }
102
103 return 0;
104 }
105
nvmet_install_queue(struct nvmet_ctrl * ctrl,struct nvmet_req * req)106 static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
107 {
108 struct nvmf_connect_command *c = &req->cmd->connect;
109 u16 qid = le16_to_cpu(c->qid);
110 u16 sqsize = le16_to_cpu(c->sqsize);
111 struct nvmet_ctrl *old;
112 u16 ret;
113
114 old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
115 if (old) {
116 pr_warn("queue already connected!\n");
117 req->error_loc = offsetof(struct nvmf_connect_command, opcode);
118 return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
119 }
120 if (!sqsize) {
121 pr_warn("queue size zero!\n");
122 req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
123 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
124 ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
125 goto err;
126 }
127
128 /* note: convert queue size from 0's-based value to 1's-based value */
129 nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
130 nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
131
132 if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) {
133 req->sq->sqhd_disabled = true;
134 req->cqe->sq_head = cpu_to_le16(0xffff);
135 }
136
137 if (ctrl->ops->install_queue) {
138 ret = ctrl->ops->install_queue(req->sq);
139 if (ret) {
140 pr_err("failed to install queue %d cntlid %d ret %x\n",
141 qid, ctrl->cntlid, ret);
142 goto err;
143 }
144 }
145
146 return 0;
147
148 err:
149 req->sq->ctrl = NULL;
150 return ret;
151 }
152
nvmet_execute_admin_connect(struct nvmet_req * req)153 static void nvmet_execute_admin_connect(struct nvmet_req *req)
154 {
155 struct nvmf_connect_command *c = &req->cmd->connect;
156 struct nvmf_connect_data *d;
157 struct nvmet_ctrl *ctrl = NULL;
158 u16 status = 0;
159
160 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
161 return;
162
163 d = kmalloc(sizeof(*d), GFP_KERNEL);
164 if (!d) {
165 status = NVME_SC_INTERNAL;
166 goto complete;
167 }
168
169 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
170 if (status)
171 goto out;
172
173 /* zero out initial completion result, assign values as needed */
174 req->cqe->result.u32 = 0;
175
176 if (c->recfmt != 0) {
177 pr_warn("invalid connect version (%d).\n",
178 le16_to_cpu(c->recfmt));
179 req->error_loc = offsetof(struct nvmf_connect_command, recfmt);
180 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
181 goto out;
182 }
183
184 if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
185 pr_warn("connect attempt for invalid controller ID %#x\n",
186 d->cntlid);
187 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
188 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
189 goto out;
190 }
191
192 status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
193 le32_to_cpu(c->kato), &ctrl);
194 if (status) {
195 if (status == (NVME_SC_INVALID_FIELD | NVME_SC_DNR))
196 req->error_loc =
197 offsetof(struct nvme_common_command, opcode);
198 goto out;
199 }
200
201 ctrl->pi_support = ctrl->port->pi_enable && ctrl->subsys->pi_support;
202
203 uuid_copy(&ctrl->hostid, &d->hostid);
204
205 status = nvmet_install_queue(ctrl, req);
206 if (status) {
207 nvmet_ctrl_put(ctrl);
208 goto out;
209 }
210
211 pr_info("creating controller %d for subsystem %s for NQN %s%s.\n",
212 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn,
213 ctrl->pi_support ? " T10-PI is enabled" : "");
214 req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid);
215
216 out:
217 kfree(d);
218 complete:
219 nvmet_req_complete(req, status);
220 }
221
nvmet_execute_io_connect(struct nvmet_req * req)222 static void nvmet_execute_io_connect(struct nvmet_req *req)
223 {
224 struct nvmf_connect_command *c = &req->cmd->connect;
225 struct nvmf_connect_data *d;
226 struct nvmet_ctrl *ctrl = NULL;
227 u16 qid = le16_to_cpu(c->qid);
228 u16 status = 0;
229
230 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
231 return;
232
233 d = kmalloc(sizeof(*d), GFP_KERNEL);
234 if (!d) {
235 status = NVME_SC_INTERNAL;
236 goto complete;
237 }
238
239 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
240 if (status)
241 goto out;
242
243 /* zero out initial completion result, assign values as needed */
244 req->cqe->result.u32 = 0;
245
246 if (c->recfmt != 0) {
247 pr_warn("invalid connect version (%d).\n",
248 le16_to_cpu(c->recfmt));
249 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
250 goto out;
251 }
252
253 status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
254 le16_to_cpu(d->cntlid),
255 req, &ctrl);
256 if (status)
257 goto out;
258
259 if (unlikely(qid > ctrl->subsys->max_qid)) {
260 pr_warn("invalid queue id (%d)\n", qid);
261 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
262 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
263 goto out_ctrl_put;
264 }
265
266 status = nvmet_install_queue(ctrl, req);
267 if (status)
268 goto out_ctrl_put;
269
270 /* pass back cntlid for successful completion */
271 req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid);
272
273 pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
274
275 out:
276 kfree(d);
277 complete:
278 nvmet_req_complete(req, status);
279 return;
280
281 out_ctrl_put:
282 nvmet_ctrl_put(ctrl);
283 goto out;
284 }
285
nvmet_parse_connect_cmd(struct nvmet_req * req)286 u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
287 {
288 struct nvme_command *cmd = req->cmd;
289
290 if (!nvme_is_fabrics(cmd)) {
291 pr_err("invalid command 0x%x on unconnected queue.\n",
292 cmd->fabrics.opcode);
293 req->error_loc = offsetof(struct nvme_common_command, opcode);
294 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
295 }
296 if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
297 pr_err("invalid capsule type 0x%x on unconnected queue.\n",
298 cmd->fabrics.fctype);
299 req->error_loc = offsetof(struct nvmf_common_command, fctype);
300 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
301 }
302
303 if (cmd->connect.qid == 0)
304 req->execute = nvmet_execute_admin_connect;
305 else
306 req->execute = nvmet_execute_io_connect;
307 return 0;
308 }
309