drivers/nvme/target/fabrics-cmd.c

   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
  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
  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                 default:
  68                         status = NVME_SC_INVALID_FIELD | NVME_STATUS_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
  85 u16 nvmet_parse_fabrics_admin_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 #ifdef CONFIG_NVME_TARGET_AUTH
  97         case nvme_fabrics_type_auth_send:
  98                 req->execute = nvmet_execute_auth_send;
  99                 break;
 100         case nvme_fabrics_type_auth_receive:
 101                 req->execute = nvmet_execute_auth_receive;
 102                 break;
 103 #endif
 104         default:
 105                 pr_debug("received unknown capsule type 0x%x\n",
 106                         cmd->fabrics.fctype);
 107                 req->error_loc = offsetof(struct nvmf_common_command, fctype);
 108                 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
 109         }
 110
 111         return 0;
 112 }
 113
 114 u16 nvmet_parse_fabrics_io_cmd(struct nvmet_req *req)
 115 {
 116         struct nvme_command *cmd = req->cmd;
 117
 118         switch (cmd->fabrics.fctype) {
 119 #ifdef CONFIG_NVME_TARGET_AUTH
 120         case nvme_fabrics_type_auth_send:
 121                 req->execute = nvmet_execute_auth_send;
 122                 break;
 123         case nvme_fabrics_type_auth_receive:
 124                 req->execute = nvmet_execute_auth_receive;
 125                 break;
 126 #endif
 127         default:
 128                 pr_debug("received unknown capsule type 0x%x\n",
 129                         cmd->fabrics.fctype);
 130                 req->error_loc = offsetof(struct nvmf_common_command, fctype);
 131                 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
 138 {
 139         struct nvmf_connect_command *c = &req->cmd->connect;
 140         u16 qid = le16_to_cpu(c->qid);
 141         u16 sqsize = le16_to_cpu(c->sqsize);
 142         struct nvmet_ctrl *old;
 143         u16 mqes = NVME_CAP_MQES(ctrl->cap);
 144         u16 ret;
 145
 146         if (!sqsize) {
 147                 pr_warn("queue size zero!\n");
 148                 req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
 149                 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
 150                 ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
 151                 goto err;
 152         }
 153
 154         if (ctrl->sqs[qid] != NULL) {
 155                 pr_warn("qid %u has already been created\n", qid);
 156                 req->error_loc = offsetof(struct nvmf_connect_command, qid);
 157                 return NVME_SC_CMD_SEQ_ERROR | NVME_STATUS_DNR;
 158         }
 159
 160         /* for fabrics, this value applies to only the I/O Submission Queues */
 161         if (qid && sqsize > mqes) {
 162                 pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n",
 163                                 sqsize, mqes, ctrl->cntlid);
 164                 req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
 165                 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
 166                 return NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
 167         }
 168
 169         old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
 170         if (old) {
 171                 pr_warn("queue already connected!\n");
 172                 req->error_loc = offsetof(struct nvmf_connect_command, opcode);
 173                 return NVME_SC_CONNECT_CTRL_BUSY | NVME_STATUS_DNR;
 174         }
 175
 176         /* note: convert queue size from 0's-based value to 1's-based value */
 177         nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
 178         nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
 179
 180         if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) {
 181                 req->sq->sqhd_disabled = true;
 182                 req->cqe->sq_head = cpu_to_le16(0xffff);
 183         }
 184
 185         if (ctrl->ops->install_queue) {
 186                 ret = ctrl->ops->install_queue(req->sq);
 187                 if (ret) {
 188                         pr_err("failed to install queue %d cntlid %d ret %x\n",
 189                                 qid, ctrl->cntlid, ret);
 190                         ctrl->sqs[qid] = NULL;
 191                         goto err;
 192                 }
 193         }
 194
 195         return 0;
 196
 197 err:
 198         req->sq->ctrl = NULL;
 199         return ret;
 200 }
 201
 202 static u32 nvmet_connect_result(struct nvmet_ctrl *ctrl)
 203 {
 204         return (u32)ctrl->cntlid |
 205                 (nvmet_has_auth(ctrl) ? NVME_CONNECT_AUTHREQ_ATR : 0);
 206 }
 207
 208 static void nvmet_execute_admin_connect(struct nvmet_req *req)
 209 {
 210         struct nvmf_connect_command *c = &req->cmd->connect;
 211         struct nvmf_connect_data *d;
 212         struct nvmet_ctrl *ctrl = NULL;
 213         u16 status;
 214         u8 dhchap_status;
 215
 216         if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
 217                 return;
 218
 219         d = kmalloc(sizeof(*d), GFP_KERNEL);
 220         if (!d) {
 221                 status = NVME_SC_INTERNAL;
 222                 goto complete;
 223         }
 224
 225         status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
 226         if (status)
 227                 goto out;
 228
 229         if (c->recfmt != 0) {
 230                 pr_warn("invalid connect version (%d).\n",
 231                         le16_to_cpu(c->recfmt));
 232                 req->error_loc = offsetof(struct nvmf_connect_command, recfmt);
 233                 status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_DNR;
 234                 goto out;
 235         }
 236
 237         if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
 238                 pr_warn("connect attempt for invalid controller ID %#x\n",
 239                         d->cntlid);
 240                 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
 241                 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
 242                 goto out;
 243         }
 244
 245         d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
 246         d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
 247         status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
 248                                   le32_to_cpu(c->kato), &ctrl);
 249         if (status)
 250                 goto out;
 251
 252         uuid_copy(&ctrl->hostid, &d->hostid);
 253
 254         dhchap_status = nvmet_setup_auth(ctrl);
 255         if (dhchap_status) {
 256                 pr_err("Failed to setup authentication, dhchap status %u\n",
 257                        dhchap_status);
 258                 nvmet_ctrl_put(ctrl);
 259                 if (dhchap_status == NVME_AUTH_DHCHAP_FAILURE_FAILED)
 260                         status = (NVME_SC_CONNECT_INVALID_HOST | NVME_STATUS_DNR);
 261                 else
 262                         status = NVME_SC_INTERNAL;
 263                 goto out;
 264         }
 265
 266         status = nvmet_install_queue(ctrl, req);
 267         if (status) {
 268                 nvmet_ctrl_put(ctrl);
 269                 goto out;
 270         }
 271
 272         pr_info("creating %s controller %d for subsystem %s for NQN %s%s%s.\n",
 273                 nvmet_is_disc_subsys(ctrl->subsys) ? "discovery" : "nvm",
 274                 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn,
 275                 ctrl->pi_support ? " T10-PI is enabled" : "",
 276                 nvmet_has_auth(ctrl) ? " with DH-HMAC-CHAP" : "");
 277         req->cqe->result.u32 = cpu_to_le32(nvmet_connect_result(ctrl));
 278 out:
 279         kfree(d);
 280 complete:
 281         nvmet_req_complete(req, status);
 282 }
 283
 284 static void nvmet_execute_io_connect(struct nvmet_req *req)
 285 {
 286         struct nvmf_connect_command *c = &req->cmd->connect;
 287         struct nvmf_connect_data *d;
 288         struct nvmet_ctrl *ctrl;
 289         u16 qid = le16_to_cpu(c->qid);
 290         u16 status;
 291
 292         if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
 293                 return;
 294
 295         d = kmalloc(sizeof(*d), GFP_KERNEL);
 296         if (!d) {
 297                 status = NVME_SC_INTERNAL;
 298                 goto complete;
 299         }
 300
 301         status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
 302         if (status)
 303                 goto out;
 304
 305         if (c->recfmt != 0) {
 306                 pr_warn("invalid connect version (%d).\n",
 307                         le16_to_cpu(c->recfmt));
 308                 status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_DNR;
 309                 goto out;
 310         }
 311
 312         d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
 313         d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
 314         ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
 315                                    le16_to_cpu(d->cntlid), req);
 316         if (!ctrl) {
 317                 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
 318                 goto out;
 319         }
 320
 321         if (unlikely(qid > ctrl->subsys->max_qid)) {
 322                 pr_warn("invalid queue id (%d)\n", qid);
 323                 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
 324                 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
 325                 goto out_ctrl_put;
 326         }
 327
 328         status = nvmet_install_queue(ctrl, req);
 329         if (status)
 330                 goto out_ctrl_put;
 331
 332         pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
 333         req->cqe->result.u32 = cpu_to_le32(nvmet_connect_result(ctrl));
 334 out:
 335         kfree(d);
 336 complete:
 337         nvmet_req_complete(req, status);
 338         return;
 339
 340 out_ctrl_put:
 341         nvmet_ctrl_put(ctrl);
 342         goto out;
 343 }
 344
 345 u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
 346 {
 347         struct nvme_command *cmd = req->cmd;
 348
 349         if (!nvme_is_fabrics(cmd)) {
 350                 pr_debug("invalid command 0x%x on unconnected queue.\n",
 351                         cmd->fabrics.opcode);
 352                 req->error_loc = offsetof(struct nvme_common_command, opcode);
 353                 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
 354         }
 355         if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
 356                 pr_debug("invalid capsule type 0x%x on unconnected queue.\n",
 357                         cmd->fabrics.fctype);
 358                 req->error_loc = offsetof(struct nvmf_common_command, fctype);
 359                 return NVME_SC_INVALID_OPCODE | NVME_STATUS_DNR;
 360         }
 361
 362         if (cmd->connect.qid == 0)
 363                 req->execute = nvmet_execute_admin_connect;
 364         else
 365                 req->execute = nvmet_execute_io_connect;
 366         return 0;
 367 }