1 /* 2 * NVMe Fabrics command implementation. 3 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 */ 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 #include <linux/blkdev.h> 16 #include "nvmet.h" 17 18 static void nvmet_execute_prop_set(struct nvmet_req *req) 19 { 20 u16 status = 0; 21 22 if (!(req->cmd->prop_set.attrib & 1)) { 23 u64 val = le64_to_cpu(req->cmd->prop_set.value); 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 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 31 break; 32 } 33 } else { 34 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 35 } 36 37 nvmet_req_complete(req, status); 38 } 39 40 static void nvmet_execute_prop_get(struct nvmet_req *req) 41 { 42 struct nvmet_ctrl *ctrl = req->sq->ctrl; 43 u16 status = 0; 44 u64 val = 0; 45 46 if (req->cmd->prop_get.attrib & 1) { 47 switch (le32_to_cpu(req->cmd->prop_get.offset)) { 48 case NVME_REG_CAP: 49 val = ctrl->cap; 50 break; 51 default: 52 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 53 break; 54 } 55 } else { 56 switch (le32_to_cpu(req->cmd->prop_get.offset)) { 57 case NVME_REG_VS: 58 val = ctrl->subsys->ver; 59 break; 60 case NVME_REG_CC: 61 val = ctrl->cc; 62 break; 63 case NVME_REG_CSTS: 64 val = ctrl->csts; 65 break; 66 default: 67 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; 68 break; 69 } 70 } 71 72 req->rsp->result.u64 = cpu_to_le64(val); 73 nvmet_req_complete(req, status); 74 } 75 76 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req) 77 { 78 struct nvme_command *cmd = req->cmd; 79 80 req->ns = NULL; 81 82 switch (cmd->fabrics.fctype) { 83 case nvme_fabrics_type_property_set: 84 req->data_len = 0; 85 req->execute = nvmet_execute_prop_set; 86 break; 87 case nvme_fabrics_type_property_get: 88 req->data_len = 0; 89 req->execute = nvmet_execute_prop_get; 90 break; 91 default: 92 pr_err("received unknown capsule type 0x%x\n", 93 cmd->fabrics.fctype); 94 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 95 } 96 97 return 0; 98 } 99 100 static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req) 101 { 102 struct nvmf_connect_command *c = &req->cmd->connect; 103 u16 qid = le16_to_cpu(c->qid); 104 u16 sqsize = le16_to_cpu(c->sqsize); 105 struct nvmet_ctrl *old; 106 107 old = cmpxchg(&req->sq->ctrl, NULL, ctrl); 108 if (old) { 109 pr_warn("queue already connected!\n"); 110 return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; 111 } 112 if (!sqsize) { 113 pr_warn("queue size zero!\n"); 114 return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 115 } 116 117 /* note: convert queue size from 0's-based value to 1's-based value */ 118 nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1); 119 nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1); 120 return 0; 121 } 122 123 static void nvmet_execute_admin_connect(struct nvmet_req *req) 124 { 125 struct nvmf_connect_command *c = &req->cmd->connect; 126 struct nvmf_connect_data *d; 127 struct nvmet_ctrl *ctrl = NULL; 128 u16 status = 0; 129 130 d = kmalloc(sizeof(*d), GFP_KERNEL); 131 if (!d) { 132 status = NVME_SC_INTERNAL; 133 goto complete; 134 } 135 136 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); 137 if (status) 138 goto out; 139 140 /* zero out initial completion result, assign values as needed */ 141 req->rsp->result.u32 = 0; 142 143 if (c->recfmt != 0) { 144 pr_warn("invalid connect version (%d).\n", 145 le16_to_cpu(c->recfmt)); 146 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 147 goto out; 148 } 149 150 if (unlikely(d->cntlid != cpu_to_le16(0xffff))) { 151 pr_warn("connect attempt for invalid controller ID %#x\n", 152 d->cntlid); 153 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 154 req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); 155 goto out; 156 } 157 158 status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req, 159 le32_to_cpu(c->kato), &ctrl); 160 if (status) 161 goto out; 162 uuid_copy(&ctrl->hostid, &d->hostid); 163 164 status = nvmet_install_queue(ctrl, req); 165 if (status) { 166 nvmet_ctrl_put(ctrl); 167 goto out; 168 } 169 170 pr_info("creating controller %d for subsystem %s for NQN %s.\n", 171 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn); 172 req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); 173 174 out: 175 kfree(d); 176 complete: 177 nvmet_req_complete(req, status); 178 } 179 180 static void nvmet_execute_io_connect(struct nvmet_req *req) 181 { 182 struct nvmf_connect_command *c = &req->cmd->connect; 183 struct nvmf_connect_data *d; 184 struct nvmet_ctrl *ctrl = NULL; 185 u16 qid = le16_to_cpu(c->qid); 186 u16 status = 0; 187 188 d = kmalloc(sizeof(*d), GFP_KERNEL); 189 if (!d) { 190 status = NVME_SC_INTERNAL; 191 goto complete; 192 } 193 194 status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); 195 if (status) 196 goto out; 197 198 /* zero out initial completion result, assign values as needed */ 199 req->rsp->result.u32 = 0; 200 201 if (c->recfmt != 0) { 202 pr_warn("invalid connect version (%d).\n", 203 le16_to_cpu(c->recfmt)); 204 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 205 goto out; 206 } 207 208 status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn, 209 le16_to_cpu(d->cntlid), 210 req, &ctrl); 211 if (status) 212 goto out; 213 214 if (unlikely(qid > ctrl->subsys->max_qid)) { 215 pr_warn("invalid queue id (%d)\n", qid); 216 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 217 req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid); 218 goto out_ctrl_put; 219 } 220 221 status = nvmet_install_queue(ctrl, req); 222 if (status) { 223 /* pass back cntlid that had the issue of installing queue */ 224 req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); 225 goto out_ctrl_put; 226 } 227 228 pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid); 229 230 out: 231 kfree(d); 232 complete: 233 nvmet_req_complete(req, status); 234 return; 235 236 out_ctrl_put: 237 nvmet_ctrl_put(ctrl); 238 goto out; 239 } 240 241 u16 nvmet_parse_connect_cmd(struct nvmet_req *req) 242 { 243 struct nvme_command *cmd = req->cmd; 244 245 req->ns = NULL; 246 247 if (cmd->common.opcode != nvme_fabrics_command) { 248 pr_err("invalid command 0x%x on unconnected queue.\n", 249 cmd->fabrics.opcode); 250 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 251 } 252 if (cmd->fabrics.fctype != nvme_fabrics_type_connect) { 253 pr_err("invalid capsule type 0x%x on unconnected queue.\n", 254 cmd->fabrics.fctype); 255 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 256 } 257 258 req->data_len = sizeof(struct nvmf_connect_data); 259 if (cmd->connect.qid == 0) 260 req->execute = nvmet_execute_admin_connect; 261 else 262 req->execute = nvmet_execute_io_connect; 263 return 0; 264 } 265