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