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_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 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 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_debug("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 } 105 106 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 mqes = NVME_CAP_MQES(ctrl->cap); 113 u16 ret; 114 115 if (!sqsize) { 116 pr_warn("queue size zero!\n"); 117 req->error_loc = offsetof(struct nvmf_connect_command, sqsize); 118 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize); 119 ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 120 goto err; 121 } 122 123 if (ctrl->sqs[qid] != NULL) { 124 pr_warn("qid %u has already been created\n", qid); 125 req->error_loc = offsetof(struct nvmf_connect_command, qid); 126 return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; 127 } 128 129 if (sqsize > mqes) { 130 pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n", 131 sqsize, mqes, ctrl->cntlid); 132 req->error_loc = offsetof(struct nvmf_connect_command, sqsize); 133 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize); 134 return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 135 } 136 137 old = cmpxchg(&req->sq->ctrl, NULL, ctrl); 138 if (old) { 139 pr_warn("queue already connected!\n"); 140 req->error_loc = offsetof(struct nvmf_connect_command, opcode); 141 return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; 142 } 143 144 /* note: convert queue size from 0's-based value to 1's-based value */ 145 nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1); 146 nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1); 147 148 if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) { 149 req->sq->sqhd_disabled = true; 150 req->cqe->sq_head = cpu_to_le16(0xffff); 151 } 152 153 if (ctrl->ops->install_queue) { 154 ret = ctrl->ops->install_queue(req->sq); 155 if (ret) { 156 pr_err("failed to install queue %d cntlid %d ret %x\n", 157 qid, ctrl->cntlid, ret); 158 ctrl->sqs[qid] = NULL; 159 goto err; 160 } 161 } 162 163 return 0; 164 165 err: 166 req->sq->ctrl = NULL; 167 return ret; 168 } 169 170 static void nvmet_execute_admin_connect(struct nvmet_req *req) 171 { 172 struct nvmf_connect_command *c = &req->cmd->connect; 173 struct nvmf_connect_data *d; 174 struct nvmet_ctrl *ctrl = NULL; 175 u16 status = 0; 176 177 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data))) 178 return; 179 180 d = kmalloc(sizeof(*d), GFP_KERNEL); 181 if (!d) { 182 status = NVME_SC_INTERNAL; 183 goto complete; 184 } 185 186 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); 187 if (status) 188 goto out; 189 190 /* zero out initial completion result, assign values as needed */ 191 req->cqe->result.u32 = 0; 192 193 if (c->recfmt != 0) { 194 pr_warn("invalid connect version (%d).\n", 195 le16_to_cpu(c->recfmt)); 196 req->error_loc = offsetof(struct nvmf_connect_command, recfmt); 197 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 198 goto out; 199 } 200 201 if (unlikely(d->cntlid != cpu_to_le16(0xffff))) { 202 pr_warn("connect attempt for invalid controller ID %#x\n", 203 d->cntlid); 204 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 205 req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); 206 goto out; 207 } 208 209 status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req, 210 le32_to_cpu(c->kato), &ctrl); 211 if (status) 212 goto out; 213 214 ctrl->pi_support = ctrl->port->pi_enable && ctrl->subsys->pi_support; 215 216 uuid_copy(&ctrl->hostid, &d->hostid); 217 218 status = nvmet_install_queue(ctrl, req); 219 if (status) { 220 nvmet_ctrl_put(ctrl); 221 goto out; 222 } 223 224 pr_info("creating %s controller %d for subsystem %s for NQN %s%s.\n", 225 nvmet_is_disc_subsys(ctrl->subsys) ? "discovery" : "nvm", 226 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn, 227 ctrl->pi_support ? " T10-PI is enabled" : ""); 228 req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid); 229 230 out: 231 kfree(d); 232 complete: 233 nvmet_req_complete(req, status); 234 } 235 236 static void nvmet_execute_io_connect(struct nvmet_req *req) 237 { 238 struct nvmf_connect_command *c = &req->cmd->connect; 239 struct nvmf_connect_data *d; 240 struct nvmet_ctrl *ctrl; 241 u16 qid = le16_to_cpu(c->qid); 242 u16 status = 0; 243 244 if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data))) 245 return; 246 247 d = kmalloc(sizeof(*d), GFP_KERNEL); 248 if (!d) { 249 status = NVME_SC_INTERNAL; 250 goto complete; 251 } 252 253 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); 254 if (status) 255 goto out; 256 257 /* zero out initial completion result, assign values as needed */ 258 req->cqe->result.u32 = 0; 259 260 if (c->recfmt != 0) { 261 pr_warn("invalid connect version (%d).\n", 262 le16_to_cpu(c->recfmt)); 263 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 264 goto out; 265 } 266 267 ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn, 268 le16_to_cpu(d->cntlid), req); 269 if (!ctrl) { 270 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 271 goto out; 272 } 273 274 if (unlikely(qid > ctrl->subsys->max_qid)) { 275 pr_warn("invalid queue id (%d)\n", qid); 276 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 277 req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid); 278 goto out_ctrl_put; 279 } 280 281 status = nvmet_install_queue(ctrl, req); 282 if (status) 283 goto out_ctrl_put; 284 285 /* pass back cntlid for successful completion */ 286 req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid); 287 288 pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid); 289 290 out: 291 kfree(d); 292 complete: 293 nvmet_req_complete(req, status); 294 return; 295 296 out_ctrl_put: 297 nvmet_ctrl_put(ctrl); 298 goto out; 299 } 300 301 u16 nvmet_parse_connect_cmd(struct nvmet_req *req) 302 { 303 struct nvme_command *cmd = req->cmd; 304 305 if (!nvme_is_fabrics(cmd)) { 306 pr_debug("invalid command 0x%x on unconnected queue.\n", 307 cmd->fabrics.opcode); 308 req->error_loc = offsetof(struct nvme_common_command, opcode); 309 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 310 } 311 if (cmd->fabrics.fctype != nvme_fabrics_type_connect) { 312 pr_debug("invalid capsule type 0x%x on unconnected queue.\n", 313 cmd->fabrics.fctype); 314 req->error_loc = offsetof(struct nvmf_common_command, fctype); 315 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 316 } 317 318 if (cmd->connect.qid == 0) 319 req->execute = nvmet_execute_admin_connect; 320 else 321 req->execute = nvmet_execute_io_connect; 322 return 0; 323 } 324