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