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->result64 = 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 = 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 = 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 NQN %s.\n",
 157                         ctrl->cntlid, ctrl->hostnqn);
 158         req->rsp->result16 = 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 = 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 = 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->result16 = 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 (req->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 }