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_STATUS_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_STATUS_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_STATUS_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 case NVME_REG_CRTO:
68 val = NVME_CAP_TIMEOUT(ctrl->csts);
69 break;
70 default:
71 status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
72 break;
73 }
74 }
75
76 if (status && req->cmd->prop_get.attrib & 1) {
77 req->error_loc =
78 offsetof(struct nvmf_property_get_command, offset);
79 } else {
80 req->error_loc =
81 offsetof(struct nvmf_property_get_command, attrib);
82 }
83
84 req->cqe->result.u64 = cpu_to_le64(val);
85 nvmet_req_complete(req, status);
86 }
87
nvmet_fabrics_admin_cmd_data_len(struct nvmet_req * req)88 u32 nvmet_fabrics_admin_cmd_data_len(struct nvmet_req *req)
89 {
90 struct nvme_command *cmd = req->cmd;
91
92 switch (cmd->fabrics.fctype) {
93 #ifdef CONFIG_NVME_TARGET_AUTH
94 case nvme_fabrics_type_auth_send:
95 return nvmet_auth_send_data_len(req);
96 case nvme_fabrics_type_auth_receive:
97 return nvmet_auth_receive_data_len(req);
98 #endif
99 default:
100 return 0;
101 }
102 }
103
nvmet_parse_fabrics_admin_cmd(struct nvmet_req * req)104 u16 nvmet_parse_fabrics_admin_cmd(struct nvmet_req *req)
105 {
106 struct nvme_command *cmd = req->cmd;
107
108 switch (cmd->fabrics.fctype) {
109 case nvme_fabrics_type_property_set:
110 req->execute = nvmet_execute_prop_set;
111 break;
112 case nvme_fabrics_type_property_get:
113 req->execute = nvmet_execute_prop_get;
114 break;
115 #ifdef CONFIG_NVME_TARGET_AUTH
116 case nvme_fabrics_type_auth_send:
117 req->execute = nvmet_execute_auth_send;
118 break;
119 case nvme_fabrics_type_auth_receive:
120 req->execute = nvmet_execute_auth_receive;
121 break;
122 #endif
123 default:
124 pr_debug("received unknown capsule type 0x%x\n",
125 cmd->fabrics.fctype);
126 req->error_loc = offsetof(struct nvmf_common_command, fctype);
127 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
128 }
129
130 return 0;
131 }
132
nvmet_fabrics_io_cmd_data_len(struct nvmet_req * req)133 u32 nvmet_fabrics_io_cmd_data_len(struct nvmet_req *req)
134 {
135 struct nvme_command *cmd = req->cmd;
136
137 switch (cmd->fabrics.fctype) {
138 #ifdef CONFIG_NVME_TARGET_AUTH
139 case nvme_fabrics_type_auth_send:
140 return nvmet_auth_send_data_len(req);
141 case nvme_fabrics_type_auth_receive:
142 return nvmet_auth_receive_data_len(req);
143 #endif
144 default:
145 return 0;
146 }
147 }
148
nvmet_parse_fabrics_io_cmd(struct nvmet_req * req)149 u16 nvmet_parse_fabrics_io_cmd(struct nvmet_req *req)
150 {
151 struct nvme_command *cmd = req->cmd;
152
153 switch (cmd->fabrics.fctype) {
154 #ifdef CONFIG_NVME_TARGET_AUTH
155 case nvme_fabrics_type_auth_send:
156 req->execute = nvmet_execute_auth_send;
157 break;
158 case nvme_fabrics_type_auth_receive:
159 req->execute = nvmet_execute_auth_receive;
160 break;
161 #endif
162 default:
163 pr_debug("received unknown capsule type 0x%x\n",
164 cmd->fabrics.fctype);
165 req->error_loc = offsetof(struct nvmf_common_command, fctype);
166 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
167 }
168
169 return 0;
170 }
171
nvmet_install_queue(struct nvmet_ctrl * ctrl,struct nvmet_req * req)172 static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
173 {
174 struct nvmf_connect_command *c = &req->cmd->connect;
175 u16 qid = le16_to_cpu(c->qid);
176 u16 sqsize = le16_to_cpu(c->sqsize);
177 struct nvmet_ctrl *old;
178 u16 mqes = NVME_CAP_MQES(ctrl->cap);
179 u16 ret;
180
181 if (!sqsize) {
182 pr_warn("queue size zero!\n");
183 req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
184 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
185 ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
186 goto err;
187 }
188
189 if (ctrl->sqs[qid] != NULL) {
190 pr_warn("qid %u has already been created\n", qid);
191 req->error_loc = offsetof(struct nvmf_connect_command, qid);
192 return NVME_SC_CMD_SEQ_ERROR | NVME_STATUS_DNR;
193 }
194
195 /* for fabrics, this value applies to only the I/O Submission Queues */
196 if (qid && sqsize > mqes) {
197 pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n",
198 sqsize, mqes, ctrl->cntlid);
199 req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
200 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
201 return NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
202 }
203
204 old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
205 if (old) {
206 pr_warn("queue already connected!\n");
207 req->error_loc = offsetof(struct nvmf_connect_command, opcode);
208 return NVME_SC_CONNECT_CTRL_BUSY | NVME_STATUS_DNR;
209 }
210
211 /* note: convert queue size from 0's-based value to 1's-based value */
212 nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
213 nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
214
215 if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) {
216 req->sq->sqhd_disabled = true;
217 req->cqe->sq_head = cpu_to_le16(0xffff);
218 }
219
220 if (ctrl->ops->install_queue) {
221 ret = ctrl->ops->install_queue(req->sq);
222 if (ret) {
223 pr_err("failed to install queue %d cntlid %d ret %x\n",
224 qid, ctrl->cntlid, ret);
225 ctrl->sqs[qid] = NULL;
226 goto err;
227 }
228 }
229
230 return 0;
231
232 err:
233 req->sq->ctrl = NULL;
234 return ret;
235 }
236
nvmet_connect_result(struct nvmet_ctrl * ctrl)237 static u32 nvmet_connect_result(struct nvmet_ctrl *ctrl)
238 {
239 return (u32)ctrl->cntlid |
240 (nvmet_has_auth(ctrl) ? NVME_CONNECT_AUTHREQ_ATR : 0);
241 }
242
nvmet_execute_admin_connect(struct nvmet_req * req)243 static void nvmet_execute_admin_connect(struct nvmet_req *req)
244 {
245 struct nvmf_connect_command *c = &req->cmd->connect;
246 struct nvmf_connect_data *d;
247 struct nvmet_ctrl *ctrl = NULL;
248 struct nvmet_alloc_ctrl_args args = {
249 .port = req->port,
250 .ops = req->ops,
251 .p2p_client = req->p2p_client,
252 .kato = le32_to_cpu(c->kato),
253 };
254
255 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
256 return;
257
258 d = kmalloc(sizeof(*d), GFP_KERNEL);
259 if (!d) {
260 args.status = NVME_SC_INTERNAL;
261 goto complete;
262 }
263
264 args.status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
265 if (args.status)
266 goto out;
267
268 if (c->recfmt != 0) {
269 pr_warn("invalid connect version (%d).\n",
270 le16_to_cpu(c->recfmt));
271 args.error_loc = offsetof(struct nvmf_connect_command, recfmt);
272 args.status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_DNR;
273 goto out;
274 }
275
276 if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
277 pr_warn("connect attempt for invalid controller ID %#x\n",
278 d->cntlid);
279 args.status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
280 args.result = IPO_IATTR_CONNECT_DATA(cntlid);
281 goto out;
282 }
283
284 d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
285 d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
286
287 args.subsysnqn = d->subsysnqn;
288 args.hostnqn = d->hostnqn;
289 args.hostid = &d->hostid;
290 args.kato = le32_to_cpu(c->kato);
291
292 ctrl = nvmet_alloc_ctrl(&args);
293 if (!ctrl)
294 goto out;
295
296 args.status = nvmet_install_queue(ctrl, req);
297 if (args.status) {
298 nvmet_ctrl_put(ctrl);
299 goto out;
300 }
301
302 args.result = cpu_to_le32(nvmet_connect_result(ctrl));
303 out:
304 kfree(d);
305 complete:
306 req->error_loc = args.error_loc;
307 req->cqe->result.u32 = args.result;
308 nvmet_req_complete(req, args.status);
309 }
310
nvmet_execute_io_connect(struct nvmet_req * req)311 static void nvmet_execute_io_connect(struct nvmet_req *req)
312 {
313 struct nvmf_connect_command *c = &req->cmd->connect;
314 struct nvmf_connect_data *d;
315 struct nvmet_ctrl *ctrl;
316 u16 qid = le16_to_cpu(c->qid);
317 u16 status;
318
319 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
320 return;
321
322 d = kmalloc(sizeof(*d), GFP_KERNEL);
323 if (!d) {
324 status = NVME_SC_INTERNAL;
325 goto complete;
326 }
327
328 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
329 if (status)
330 goto out;
331
332 if (c->recfmt != 0) {
333 pr_warn("invalid connect version (%d).\n",
334 le16_to_cpu(c->recfmt));
335 status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_DNR;
336 goto out;
337 }
338
339 d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
340 d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
341 ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
342 le16_to_cpu(d->cntlid), req);
343 if (!ctrl) {
344 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
345 goto out;
346 }
347
348 if (unlikely(qid > ctrl->subsys->max_qid)) {
349 pr_warn("invalid queue id (%d)\n", qid);
350 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
351 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
352 goto out_ctrl_put;
353 }
354
355 status = nvmet_install_queue(ctrl, req);
356 if (status)
357 goto out_ctrl_put;
358
359 pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
360 req->cqe->result.u32 = cpu_to_le32(nvmet_connect_result(ctrl));
361 out:
362 kfree(d);
363 complete:
364 nvmet_req_complete(req, status);
365 return;
366
367 out_ctrl_put:
368 nvmet_ctrl_put(ctrl);
369 goto out;
370 }
371
nvmet_connect_cmd_data_len(struct nvmet_req * req)372 u32 nvmet_connect_cmd_data_len(struct nvmet_req *req)
373 {
374 struct nvme_command *cmd = req->cmd;
375
376 if (!nvme_is_fabrics(cmd) ||
377 cmd->fabrics.fctype != nvme_fabrics_type_connect)
378 return 0;
379
380 return sizeof(struct nvmf_connect_data);
381 }
382
nvmet_parse_connect_cmd(struct nvmet_req * req)383 u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
384 {
385 struct nvme_command *cmd = req->cmd;
386
387 if (!nvme_is_fabrics(cmd)) {
388 pr_debug("invalid command 0x%x on unconnected queue.\n",
389 cmd->fabrics.opcode);
390 req->error_loc = offsetof(struct nvme_common_command, opcode);
391 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
392 }
393 if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
394 pr_debug("invalid capsule type 0x%x on unconnected queue.\n",
395 cmd->fabrics.fctype);
396 req->error_loc = offsetof(struct nvmf_common_command, fctype);
397 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
398 }
399
400 if (cmd->connect.qid == 0)
401 req->execute = nvmet_execute_admin_connect;
402 else
403 req->execute = nvmet_execute_io_connect;
404 return 0;
405 }
406