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 int 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 } 112 113 nvmet_cq_setup(ctrl, req->cq, qid, sqsize); 114 nvmet_sq_setup(ctrl, req->sq, qid, sqsize); 115 return 0; 116 } 117 118 static void nvmet_execute_admin_connect(struct nvmet_req *req) 119 { 120 struct nvmf_connect_command *c = &req->cmd->connect; 121 struct nvmf_connect_data *d; 122 struct nvmet_ctrl *ctrl = NULL; 123 u16 status = 0; 124 125 d = kmap(sg_page(req->sg)) + req->sg->offset; 126 127 /* zero out initial completion result, assign values as needed */ 128 req->rsp->result.u32 = 0; 129 130 if (c->recfmt != 0) { 131 pr_warn("invalid connect version (%d).\n", 132 le16_to_cpu(c->recfmt)); 133 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 134 goto out; 135 } 136 137 if (unlikely(d->cntlid != cpu_to_le16(0xffff))) { 138 pr_warn("connect attempt for invalid controller ID %#x\n", 139 d->cntlid); 140 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 141 req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); 142 goto out; 143 } 144 145 status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req, 146 le32_to_cpu(c->kato), &ctrl); 147 if (status) 148 goto out; 149 150 status = nvmet_install_queue(ctrl, req); 151 if (status) { 152 nvmet_ctrl_put(ctrl); 153 goto out; 154 } 155 156 pr_info("creating controller %d for subsystem %s for NQN %s.\n", 157 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn); 158 req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); 159 160 out: 161 kunmap(sg_page(req->sg)); 162 nvmet_req_complete(req, status); 163 } 164 165 static void nvmet_execute_io_connect(struct nvmet_req *req) 166 { 167 struct nvmf_connect_command *c = &req->cmd->connect; 168 struct nvmf_connect_data *d; 169 struct nvmet_ctrl *ctrl = NULL; 170 u16 qid = le16_to_cpu(c->qid); 171 u16 status = 0; 172 173 d = kmap(sg_page(req->sg)) + req->sg->offset; 174 175 /* zero out initial completion result, assign values as needed */ 176 req->rsp->result.u32 = 0; 177 178 if (c->recfmt != 0) { 179 pr_warn("invalid connect version (%d).\n", 180 le16_to_cpu(c->recfmt)); 181 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; 182 goto out; 183 } 184 185 status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn, 186 le16_to_cpu(d->cntlid), 187 req, &ctrl); 188 if (status) 189 goto out; 190 191 if (unlikely(qid > ctrl->subsys->max_qid)) { 192 pr_warn("invalid queue id (%d)\n", qid); 193 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; 194 req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid); 195 goto out_ctrl_put; 196 } 197 198 status = nvmet_install_queue(ctrl, req); 199 if (status) { 200 /* pass back cntlid that had the issue of installing queue */ 201 req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid); 202 goto out_ctrl_put; 203 } 204 205 pr_info("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid); 206 207 out: 208 kunmap(sg_page(req->sg)); 209 nvmet_req_complete(req, status); 210 return; 211 212 out_ctrl_put: 213 nvmet_ctrl_put(ctrl); 214 goto out; 215 } 216 217 int nvmet_parse_connect_cmd(struct nvmet_req *req) 218 { 219 struct nvme_command *cmd = req->cmd; 220 221 req->ns = NULL; 222 223 if (cmd->common.opcode != nvme_fabrics_command) { 224 pr_err("invalid command 0x%x on unconnected queue.\n", 225 cmd->fabrics.opcode); 226 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 227 } 228 if (cmd->fabrics.fctype != nvme_fabrics_type_connect) { 229 pr_err("invalid capsule type 0x%x on unconnected queue.\n", 230 cmd->fabrics.fctype); 231 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; 232 } 233 234 req->data_len = sizeof(struct nvmf_connect_data); 235 if (cmd->connect.qid == 0) 236 req->execute = nvmet_execute_admin_connect; 237 else 238 req->execute = nvmet_execute_io_connect; 239 return 0; 240 } 241