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/*
* NVMe Fabrics command implementation.
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/blkdev.h>
#include "nvmet.h"
static void nvmet_execute_prop_set(struct nvmet_req *req)
{
u16 status = 0;
if (!(req->cmd->prop_set.attrib & 1)) {
u64 val = le64_to_cpu(req->cmd->prop_set.value);
switch (le32_to_cpu(req->cmd->prop_set.offset)) {
case NVME_REG_CC:
nvmet_update_cc(req->sq->ctrl, val);
break;
default:
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
} else {
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
nvmet_req_complete(req, status);
}
static void nvmet_execute_prop_get(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
u16 status = 0;
u64 val = 0;
if (req->cmd->prop_get.attrib & 1) {
switch (le32_to_cpu(req->cmd->prop_get.offset)) {
case NVME_REG_CAP:
val = ctrl->cap;
break;
default:
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
} else {
switch (le32_to_cpu(req->cmd->prop_get.offset)) {
case NVME_REG_VS:
val = ctrl->subsys->ver;
break;
case NVME_REG_CC:
val = ctrl->cc;
break;
case NVME_REG_CSTS:
val = ctrl->csts;
break;
default:
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
}
req->rsp->result.u64 = cpu_to_le64(val);
nvmet_req_complete(req, status);
}
u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
switch (cmd->fabrics.fctype) {
case nvme_fabrics_type_property_set:
req->data_len = 0;
req->execute = nvmet_execute_prop_set;
break;
case nvme_fabrics_type_property_get:
req->data_len = 0;
req->execute = nvmet_execute_prop_get;
break;
default:
pr_err("received unknown capsule type 0x%x\n",
cmd->fabrics.fctype);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
return 0;
}
static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
{
struct nvmf_connect_command *c = &req->cmd->connect;
u16 qid = le16_to_cpu(c->qid);
u16 sqsize = le16_to_cpu(c->sqsize);
struct nvmet_ctrl *old;
old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
if (old) {
pr_warn("queue already connected!\n");
return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
}
if (!sqsize) {
pr_warn("queue size zero!\n");
return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
}
/* note: convert queue size from 0's-based value to 1's-based value */
nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
return 0;
}
static void nvmet_execute_admin_connect(struct nvmet_req *req)
{
struct nvmf_connect_command *c = &req->cmd->connect;
struct nvmf_connect_data *d;
struct nvmet_ctrl *ctrl = NULL;
u16 status = 0;
d = kmalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
status = NVME_SC_INTERNAL;
goto complete;
}
status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
if (status)
goto out;
/* zero out initial completion result, assign values as needed */
req->rsp->result.u32 = 0;
if (c->recfmt != 0) {
pr_warn("invalid connect version (%d).\n",
le16_to_cpu(c->recfmt));
status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
goto out;
}
if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
pr_warn("connect attempt for invalid controller ID %#x\n",
d->cntlid);
status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
goto out;
}
status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
le32_to_cpu(c->kato), &ctrl);
if (status)
goto out;
uuid_copy(&ctrl->hostid, &d->hostid);
status = nvmet_install_queue(ctrl, req);
if (status) {
nvmet_ctrl_put(ctrl);
goto out;
}
pr_info("creating controller %d for subsystem %s for NQN %s.\n",
ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn);
req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
out:
kfree(d);
complete:
nvmet_req_complete(req, status);
}
static void nvmet_execute_io_connect(struct nvmet_req *req)
{
struct nvmf_connect_command *c = &req->cmd->connect;
struct nvmf_connect_data *d;
struct nvmet_ctrl *ctrl = NULL;
u16 qid = le16_to_cpu(c->qid);
u16 status = 0;
d = kmalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
status = NVME_SC_INTERNAL;
goto complete;
}
status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
if (status)
goto out;
/* zero out initial completion result, assign values as needed */
req->rsp->result.u32 = 0;
if (c->recfmt != 0) {
pr_warn("invalid connect version (%d).\n",
le16_to_cpu(c->recfmt));
status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
goto out;
}
status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
le16_to_cpu(d->cntlid),
req, &ctrl);
if (status)
goto out;
if (unlikely(qid > ctrl->subsys->max_qid)) {
pr_warn("invalid queue id (%d)\n", qid);
status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
goto out_ctrl_put;
}
status = nvmet_install_queue(ctrl, req);
if (status) {
/* pass back cntlid that had the issue of installing queue */
req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
goto out_ctrl_put;
}
pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
out:
kfree(d);
complete:
nvmet_req_complete(req, status);
return;
out_ctrl_put:
nvmet_ctrl_put(ctrl);
goto out;
}
u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
if (cmd->common.opcode != nvme_fabrics_command) {
pr_err("invalid command 0x%x on unconnected queue.\n",
cmd->fabrics.opcode);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
pr_err("invalid capsule type 0x%x on unconnected queue.\n",
cmd->fabrics.fctype);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
req->data_len = sizeof(struct nvmf_connect_data);
if (cmd->connect.qid == 0)
req->execute = nvmet_execute_admin_connect;
else
req->execute = nvmet_execute_io_connect;
return 0;
}
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