drivers/nvme/target/fabrics-cmd.c

   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         switch (cmd->fabrics.fctype) {
  81         case nvme_fabrics_type_property_set:
  82                 req->data_len = 0;
  83                 req->execute = nvmet_execute_prop_set;
  84                 break;
  85         case nvme_fabrics_type_property_get:
  86                 req->data_len = 0;
  87                 req->execute = nvmet_execute_prop_get;
  88                 break;
  89         default:
  90                 pr_err("received unknown capsule type 0x%x\n",
  91                         cmd->fabrics.fctype);
  92                 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
  99 {
 100         struct nvmf_connect_command *c = &req->cmd->connect;
 101         u16 qid = le16_to_cpu(c->qid);
 102         u16 sqsize = le16_to_cpu(c->sqsize);
 103         struct nvmet_ctrl *old;
 104
 105         old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
 106         if (old) {
 107                 pr_warn("queue already connected!\n");
 108                 return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
 109         }
 110         if (!sqsize) {
 111                 pr_warn("queue size zero!\n");
 112                 return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
 113         }
 114
 115         /* note: convert queue size from 0's-based value to 1's-based value */
 116         nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
 117         nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
 118         return 0;
 119 }
 120
 121 static void nvmet_execute_admin_connect(struct nvmet_req *req)
 122 {
 123         struct nvmf_connect_command *c = &req->cmd->connect;
 124         struct nvmf_connect_data *d;
 125         struct nvmet_ctrl *ctrl = NULL;
 126         u16 status = 0;
 127
 128         d = kmalloc(sizeof(*d), GFP_KERNEL);
 129         if (!d) {
 130                 status = NVME_SC_INTERNAL;
 131                 goto complete;
 132         }
 133
 134         status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
 135         if (status)
 136                 goto out;
 137
 138         /* zero out initial completion result, assign values as needed */
 139         req->rsp->result.u32 = 0;
 140
 141         if (c->recfmt != 0) {
 142                 pr_warn("invalid connect version (%d).\n",
 143                         le16_to_cpu(c->recfmt));
 144                 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
 145                 goto out;
 146         }
 147
 148         if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
 149                 pr_warn("connect attempt for invalid controller ID %#x\n",
 150                         d->cntlid);
 151                 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
 152                 req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
 153                 goto out;
 154         }
 155
 156         status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
 157                                   le32_to_cpu(c->kato), &ctrl);
 158         if (status)
 159                 goto out;
 160         uuid_copy(&ctrl->hostid, &d->hostid);
 161
 162         status = nvmet_install_queue(ctrl, req);
 163         if (status) {
 164                 nvmet_ctrl_put(ctrl);
 165                 goto out;
 166         }
 167
 168         pr_info("creating controller %d for subsystem %s for NQN %s.\n",
 169                 ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn);
 170         req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
 171
 172 out:
 173         kfree(d);
 174 complete:
 175         nvmet_req_complete(req, status);
 176 }
 177
 178 static void nvmet_execute_io_connect(struct nvmet_req *req)
 179 {
 180         struct nvmf_connect_command *c = &req->cmd->connect;
 181         struct nvmf_connect_data *d;
 182         struct nvmet_ctrl *ctrl = NULL;
 183         u16 qid = le16_to_cpu(c->qid);
 184         u16 status = 0;
 185
 186         d = kmalloc(sizeof(*d), GFP_KERNEL);
 187         if (!d) {
 188                 status = NVME_SC_INTERNAL;
 189                 goto complete;
 190         }
 191
 192         status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
 193         if (status)
 194                 goto out;
 195
 196         /* zero out initial completion result, assign values as needed */
 197         req->rsp->result.u32 = 0;
 198
 199         if (c->recfmt != 0) {
 200                 pr_warn("invalid connect version (%d).\n",
 201                         le16_to_cpu(c->recfmt));
 202                 status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
 203                 goto out;
 204         }
 205
 206         status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
 207                                      le16_to_cpu(d->cntlid),
 208                                      req, &ctrl);
 209         if (status)
 210                 goto out;
 211
 212         if (unlikely(qid > ctrl->subsys->max_qid)) {
 213                 pr_warn("invalid queue id (%d)\n", qid);
 214                 status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
 215                 req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
 216                 goto out_ctrl_put;
 217         }
 218
 219         status = nvmet_install_queue(ctrl, req);
 220         if (status) {
 221                 /* pass back cntlid that had the issue of installing queue */
 222                 req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
 223                 goto out_ctrl_put;
 224         }
 225
 226         pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
 227
 228 out:
 229         kfree(d);
 230 complete:
 231         nvmet_req_complete(req, status);
 232         return;
 233
 234 out_ctrl_put:
 235         nvmet_ctrl_put(ctrl);
 236         goto out;
 237 }
 238
 239 u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
 240 {
 241         struct nvme_command *cmd = req->cmd;
 242
 243         if (cmd->common.opcode != nvme_fabrics_command) {
 244                 pr_err("invalid command 0x%x on unconnected queue.\n",
 245                         cmd->fabrics.opcode);
 246                 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 247         }
 248         if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
 249                 pr_err("invalid capsule type 0x%x on unconnected queue.\n",
 250                         cmd->fabrics.fctype);
 251                 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
 252         }
 253
 254         req->data_len = sizeof(struct nvmf_connect_data);
 255         if (cmd->connect.qid == 0)
 256                 req->execute = nvmet_execute_admin_connect;
 257         else
 258                 req->execute = nvmet_execute_io_connect;
 259         return 0;
 260 }