linux/drivers/nvme/target/admin-cmd.c

977 lines
25 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* NVMe admin command implementation.
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/rculist.h>
#include <linux/part_stat.h>
#include <generated/utsrelease.h>
#include <asm/unaligned.h>
#include "nvmet.h"
u32 nvmet_get_log_page_len(struct nvme_command *cmd)
{
u32 len = le16_to_cpu(cmd->get_log_page.numdu);
len <<= 16;
len += le16_to_cpu(cmd->get_log_page.numdl);
/* NUMD is a 0's based value */
len += 1;
len *= sizeof(u32);
return len;
}
static u32 nvmet_feat_data_len(struct nvmet_req *req, u32 cdw10)
{
switch (cdw10 & 0xff) {
case NVME_FEAT_HOST_ID:
return sizeof(req->sq->ctrl->hostid);
default:
return 0;
}
}
u64 nvmet_get_log_page_offset(struct nvme_command *cmd)
{
return le64_to_cpu(cmd->get_log_page.lpo);
}
static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
{
nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->transfer_len));
}
static void nvmet_execute_get_log_page_error(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
unsigned long flags;
off_t offset = 0;
u64 slot;
u64 i;
spin_lock_irqsave(&ctrl->error_lock, flags);
slot = ctrl->err_counter % NVMET_ERROR_LOG_SLOTS;
for (i = 0; i < NVMET_ERROR_LOG_SLOTS; i++) {
if (nvmet_copy_to_sgl(req, offset, &ctrl->slots[slot],
sizeof(struct nvme_error_slot)))
break;
if (slot == 0)
slot = NVMET_ERROR_LOG_SLOTS - 1;
else
slot--;
offset += sizeof(struct nvme_error_slot);
}
spin_unlock_irqrestore(&ctrl->error_lock, flags);
nvmet_req_complete(req, 0);
}
static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
struct nvmet_ns *ns;
u64 host_reads, host_writes, data_units_read, data_units_written;
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
if (!ns) {
pr_err("Could not find namespace id : %d\n",
le32_to_cpu(req->cmd->get_log_page.nsid));
req->error_loc = offsetof(struct nvme_rw_command, nsid);
return NVME_SC_INVALID_NS;
}
/* we don't have the right data for file backed ns */
if (!ns->bdev)
goto out;
host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part,
sectors[READ]), 1000);
host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
data_units_written = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part,
sectors[WRITE]), 1000);
put_unaligned_le64(host_reads, &slog->host_reads[0]);
put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
put_unaligned_le64(host_writes, &slog->host_writes[0]);
put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
out:
nvmet_put_namespace(ns);
return NVME_SC_SUCCESS;
}
static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
u64 host_reads = 0, host_writes = 0;
u64 data_units_read = 0, data_units_written = 0;
struct nvmet_ns *ns;
struct nvmet_ctrl *ctrl;
ctrl = req->sq->ctrl;
rcu_read_lock();
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
/* we don't have the right data for file backed ns */
if (!ns->bdev)
continue;
host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read += DIV_ROUND_UP(
part_stat_read(ns->bdev->bd_part, sectors[READ]), 1000);
host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
data_units_written += DIV_ROUND_UP(
part_stat_read(ns->bdev->bd_part, sectors[WRITE]), 1000);
}
rcu_read_unlock();
put_unaligned_le64(host_reads, &slog->host_reads[0]);
put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
put_unaligned_le64(host_writes, &slog->host_writes[0]);
put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
return NVME_SC_SUCCESS;
}
static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
{
struct nvme_smart_log *log;
u16 status = NVME_SC_INTERNAL;
unsigned long flags;
if (req->transfer_len != sizeof(*log))
goto out;
log = kzalloc(sizeof(*log), GFP_KERNEL);
if (!log)
goto out;
if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
status = nvmet_get_smart_log_all(req, log);
else
status = nvmet_get_smart_log_nsid(req, log);
if (status)
goto out_free_log;
spin_lock_irqsave(&req->sq->ctrl->error_lock, flags);
put_unaligned_le64(req->sq->ctrl->err_counter,
&log->num_err_log_entries);
spin_unlock_irqrestore(&req->sq->ctrl->error_lock, flags);
status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
out_free_log:
kfree(log);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req)
{
u16 status = NVME_SC_INTERNAL;
struct nvme_effects_log *log;
log = kzalloc(sizeof(*log), GFP_KERNEL);
if (!log)
goto out;
log->acs[nvme_admin_get_log_page] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_identify] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_abort_cmd] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_set_features] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_get_features] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_async_event] = cpu_to_le32(1 << 0);
log->acs[nvme_admin_keep_alive] = cpu_to_le32(1 << 0);
log->iocs[nvme_cmd_read] = cpu_to_le32(1 << 0);
log->iocs[nvme_cmd_write] = cpu_to_le32(1 << 0);
log->iocs[nvme_cmd_flush] = cpu_to_le32(1 << 0);
log->iocs[nvme_cmd_dsm] = cpu_to_le32(1 << 0);
log->iocs[nvme_cmd_write_zeroes] = cpu_to_le32(1 << 0);
status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
kfree(log);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
u16 status = NVME_SC_INTERNAL;
size_t len;
if (req->transfer_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32))
goto out;
mutex_lock(&ctrl->lock);
if (ctrl->nr_changed_ns == U32_MAX)
len = sizeof(__le32);
else
len = ctrl->nr_changed_ns * sizeof(__le32);
status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len);
if (!status)
status = nvmet_zero_sgl(req, len, req->transfer_len - len);
ctrl->nr_changed_ns = 0;
nvmet_clear_aen_bit(req, NVME_AEN_BIT_NS_ATTR);
mutex_unlock(&ctrl->lock);
out:
nvmet_req_complete(req, status);
}
static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid,
struct nvme_ana_group_desc *desc)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvmet_ns *ns;
u32 count = 0;
if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) {
rcu_read_lock();
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link)
if (ns->anagrpid == grpid)
desc->nsids[count++] = cpu_to_le32(ns->nsid);
rcu_read_unlock();
}
desc->grpid = cpu_to_le32(grpid);
desc->nnsids = cpu_to_le32(count);
desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
desc->state = req->port->ana_state[grpid];
memset(desc->rsvd17, 0, sizeof(desc->rsvd17));
return sizeof(struct nvme_ana_group_desc) + count * sizeof(__le32);
}
static void nvmet_execute_get_log_page_ana(struct nvmet_req *req)
{
struct nvme_ana_rsp_hdr hdr = { 0, };
struct nvme_ana_group_desc *desc;
size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */
size_t len;
u32 grpid;
u16 ngrps = 0;
u16 status;
status = NVME_SC_INTERNAL;
desc = kmalloc(sizeof(struct nvme_ana_group_desc) +
NVMET_MAX_NAMESPACES * sizeof(__le32), GFP_KERNEL);
if (!desc)
goto out;
down_read(&nvmet_ana_sem);
for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
if (!nvmet_ana_group_enabled[grpid])
continue;
len = nvmet_format_ana_group(req, grpid, desc);
status = nvmet_copy_to_sgl(req, offset, desc, len);
if (status)
break;
offset += len;
ngrps++;
}
for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
if (nvmet_ana_group_enabled[grpid])
ngrps++;
}
hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
hdr.ngrps = cpu_to_le16(ngrps);
nvmet_clear_aen_bit(req, NVME_AEN_BIT_ANA_CHANGE);
up_read(&nvmet_ana_sem);
kfree(desc);
/* copy the header last once we know the number of groups */
status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr));
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_get_log_page(struct nvmet_req *req)
{
if (!nvmet_check_transfer_len(req, nvmet_get_log_page_len(req->cmd)))
return;
switch (req->cmd->get_log_page.lid) {
case NVME_LOG_ERROR:
return nvmet_execute_get_log_page_error(req);
case NVME_LOG_SMART:
return nvmet_execute_get_log_page_smart(req);
case NVME_LOG_FW_SLOT:
/*
* We only support a single firmware slot which always is
* active, so we can zero out the whole firmware slot log and
* still claim to fully implement this mandatory log page.
*/
return nvmet_execute_get_log_page_noop(req);
case NVME_LOG_CHANGED_NS:
return nvmet_execute_get_log_changed_ns(req);
case NVME_LOG_CMD_EFFECTS:
return nvmet_execute_get_log_cmd_effects_ns(req);
case NVME_LOG_ANA:
return nvmet_execute_get_log_page_ana(req);
}
pr_err("unhandled lid %d on qid %d\n",
req->cmd->get_log_page.lid, req->sq->qid);
req->error_loc = offsetof(struct nvme_get_log_page_command, lid);
nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR);
}
static void nvmet_id_set_model_number(struct nvme_id_ctrl *id,
struct nvmet_subsys *subsys)
{
const char *model = NVMET_DEFAULT_CTRL_MODEL;
struct nvmet_subsys_model *subsys_model;
rcu_read_lock();
subsys_model = rcu_dereference(subsys->model);
if (subsys_model)
model = subsys_model->number;
memcpy_and_pad(id->mn, sizeof(id->mn), model, strlen(model), ' ');
rcu_read_unlock();
}
static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl *id;
u32 cmd_capsule_size;
u16 status = 0;
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
status = NVME_SC_INTERNAL;
goto out;
}
/* XXX: figure out how to assign real vendors IDs. */
id->vid = 0;
id->ssvid = 0;
memset(id->sn, ' ', sizeof(id->sn));
bin2hex(id->sn, &ctrl->subsys->serial,
min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
nvmet_id_set_model_number(id, ctrl->subsys);
memcpy_and_pad(id->fr, sizeof(id->fr),
UTS_RELEASE, strlen(UTS_RELEASE), ' ');
id->rab = 6;
/*
* XXX: figure out how we can assign a IEEE OUI, but until then
* the safest is to leave it as zeroes.
*/
/* we support multiple ports, multiples hosts and ANA: */
id->cmic = (1 << 0) | (1 << 1) | (1 << 3);
/* Limit MDTS according to transport capability */
if (ctrl->ops->get_mdts)
id->mdts = ctrl->ops->get_mdts(ctrl);
else
id->mdts = 0;
id->cntlid = cpu_to_le16(ctrl->cntlid);
id->ver = cpu_to_le32(ctrl->subsys->ver);
/* XXX: figure out what to do about RTD3R/RTD3 */
id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);
id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT |
NVME_CTRL_ATTR_TBKAS);
id->oacs = 0;
/*
* We don't really have a practical limit on the number of abort
* comands. But we don't do anything useful for abort either, so
* no point in allowing more abort commands than the spec requires.
*/
id->acl = 3;
id->aerl = NVMET_ASYNC_EVENTS - 1;
/* first slot is read-only, only one slot supported */
id->frmw = (1 << 0) | (1 << 1);
id->lpa = (1 << 0) | (1 << 1) | (1 << 2);
id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
id->npss = 0;
/* We support keep-alive timeout in granularity of seconds */
id->kas = cpu_to_le16(NVMET_KAS);
id->sqes = (0x6 << 4) | 0x6;
id->cqes = (0x4 << 4) | 0x4;
/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES);
id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
NVME_CTRL_ONCS_WRITE_ZEROES);
/* XXX: don't report vwc if the underlying device is write through */
id->vwc = NVME_CTRL_VWC_PRESENT;
/*
* We can't support atomic writes bigger than a LBA without support
* from the backend device.
*/
id->awun = 0;
id->awupf = 0;
id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
if (ctrl->ops->has_keyed_sgls)
id->sgls |= cpu_to_le32(1 << 2);
if (req->port->inline_data_size)
id->sgls |= cpu_to_le32(1 << 20);
strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
/*
* Max command capsule size is sqe + in-capsule data size.
* Disable in-capsule data for Metadata capable controllers.
*/
cmd_capsule_size = sizeof(struct nvme_command);
if (!ctrl->pi_support)
cmd_capsule_size += req->port->inline_data_size;
id->ioccsz = cpu_to_le32(cmd_capsule_size / 16);
/* Max response capsule size is cqe */
id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
id->msdbd = ctrl->ops->msdbd;
id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4);
id->anatt = 10; /* random value */
id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS);
id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS);
/*
* Meh, we don't really support any power state. Fake up the same
* values that qemu does.
*/
id->psd[0].max_power = cpu_to_le16(0x9c4);
id->psd[0].entry_lat = cpu_to_le32(0x10);
id->psd[0].exit_lat = cpu_to_le32(0x4);
id->nwpc = 1 << 0; /* write protect and no write protect */
status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
kfree(id);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_identify_ns(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvmet_ns *ns;
struct nvme_id_ns *id;
u16 status = 0;
if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
req->error_loc = offsetof(struct nvme_identify, nsid);
status = NVME_SC_INVALID_NS | NVME_SC_DNR;
goto out;
}
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
status = NVME_SC_INTERNAL;
goto out;
}
/* return an all zeroed buffer if we can't find an active namespace */
ns = nvmet_find_namespace(ctrl, req->cmd->identify.nsid);
if (!ns)
goto done;
nvmet_ns_revalidate(ns);
/*
* nuse = ncap = nsze isn't always true, but we have no way to find
* that out from the underlying device.
*/
id->ncap = id->nsze = cpu_to_le64(ns->size >> ns->blksize_shift);
switch (req->port->ana_state[ns->anagrpid]) {
case NVME_ANA_INACCESSIBLE:
case NVME_ANA_PERSISTENT_LOSS:
break;
default:
id->nuse = id->nsze;
break;
}
if (ns->bdev)
nvmet_bdev_set_limits(ns->bdev, id);
/*
* We just provide a single LBA format that matches what the
* underlying device reports.
*/
id->nlbaf = 0;
id->flbas = 0;
/*
* Our namespace might always be shared. Not just with other
* controllers, but also with any other user of the block device.
*/
id->nmic = (1 << 0);
id->anagrpid = cpu_to_le32(ns->anagrpid);
memcpy(&id->nguid, &ns->nguid, sizeof(id->nguid));
id->lbaf[0].ds = ns->blksize_shift;
if (ctrl->pi_support && nvmet_ns_has_pi(ns)) {
id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
NVME_NS_DPC_PI_TYPE3;
id->mc = NVME_MC_EXTENDED_LBA;
id->dps = ns->pi_type;
id->flbas = NVME_NS_FLBAS_META_EXT;
id->lbaf[0].ms = cpu_to_le16(ns->metadata_size);
}
if (ns->readonly)
id->nsattr |= (1 << 0);
nvmet_put_namespace(ns);
done:
status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
kfree(id);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_identify_nslist(struct nvmet_req *req)
{
static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvmet_ns *ns;
u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
__le32 *list;
u16 status = 0;
int i = 0;
list = kzalloc(buf_size, GFP_KERNEL);
if (!list) {
status = NVME_SC_INTERNAL;
goto out;
}
rcu_read_lock();
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
if (ns->nsid <= min_nsid)
continue;
list[i++] = cpu_to_le32(ns->nsid);
if (i == buf_size / sizeof(__le32))
break;
}
rcu_read_unlock();
status = nvmet_copy_to_sgl(req, 0, list, buf_size);
kfree(list);
out:
nvmet_req_complete(req, status);
}
static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
void *id, off_t *off)
{
struct nvme_ns_id_desc desc = {
.nidt = type,
.nidl = len,
};
u16 status;
status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
if (status)
return status;
*off += sizeof(desc);
status = nvmet_copy_to_sgl(req, *off, id, len);
if (status)
return status;
*off += len;
return 0;
}
static void nvmet_execute_identify_desclist(struct nvmet_req *req)
{
struct nvmet_ns *ns;
u16 status = 0;
off_t off = 0;
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
if (!ns) {
req->error_loc = offsetof(struct nvme_identify, nsid);
status = NVME_SC_INVALID_NS | NVME_SC_DNR;
goto out;
}
if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
NVME_NIDT_UUID_LEN,
&ns->uuid, &off);
if (status)
goto out_put_ns;
}
if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
NVME_NIDT_NGUID_LEN,
&ns->nguid, &off);
if (status)
goto out_put_ns;
}
if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
off) != NVME_IDENTIFY_DATA_SIZE - off)
status = NVME_SC_INTERNAL | NVME_SC_DNR;
out_put_ns:
nvmet_put_namespace(ns);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_identify(struct nvmet_req *req)
{
if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
return;
switch (req->cmd->identify.cns) {
case NVME_ID_CNS_NS:
return nvmet_execute_identify_ns(req);
case NVME_ID_CNS_CTRL:
return nvmet_execute_identify_ctrl(req);
case NVME_ID_CNS_NS_ACTIVE_LIST:
return nvmet_execute_identify_nslist(req);
case NVME_ID_CNS_NS_DESC_LIST:
return nvmet_execute_identify_desclist(req);
}
pr_err("unhandled identify cns %d on qid %d\n",
req->cmd->identify.cns, req->sq->qid);
req->error_loc = offsetof(struct nvme_identify, cns);
nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR);
}
/*
* A "minimum viable" abort implementation: the command is mandatory in the
* spec, but we are not required to do any useful work. We couldn't really
* do a useful abort, so don't bother even with waiting for the command
* to be exectuted and return immediately telling the command to abort
* wasn't found.
*/
static void nvmet_execute_abort(struct nvmet_req *req)
{
if (!nvmet_check_transfer_len(req, 0))
return;
nvmet_set_result(req, 1);
nvmet_req_complete(req, 0);
}
static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req)
{
u16 status;
if (req->ns->file)
status = nvmet_file_flush(req);
else
status = nvmet_bdev_flush(req);
if (status)
pr_err("write protect flush failed nsid: %u\n", req->ns->nsid);
return status;
}
static u16 nvmet_set_feat_write_protect(struct nvmet_req *req)
{
u32 write_protect = le32_to_cpu(req->cmd->common.cdw11);
struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
u16 status = NVME_SC_FEATURE_NOT_CHANGEABLE;
req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->rw.nsid);
if (unlikely(!req->ns)) {
req->error_loc = offsetof(struct nvme_common_command, nsid);
return status;
}
mutex_lock(&subsys->lock);
switch (write_protect) {
case NVME_NS_WRITE_PROTECT:
req->ns->readonly = true;
status = nvmet_write_protect_flush_sync(req);
if (status)
req->ns->readonly = false;
break;
case NVME_NS_NO_WRITE_PROTECT:
req->ns->readonly = false;
status = 0;
break;
default:
break;
}
if (!status)
nvmet_ns_changed(subsys, req->ns->nsid);
mutex_unlock(&subsys->lock);
return status;
}
u16 nvmet_set_feat_kato(struct nvmet_req *req)
{
u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
nvmet_set_result(req, req->sq->ctrl->kato);
return 0;
}
u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask)
{
u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
if (val32 & ~mask) {
req->error_loc = offsetof(struct nvme_common_command, cdw11);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
WRITE_ONCE(req->sq->ctrl->aen_enabled, val32);
nvmet_set_result(req, val32);
return 0;
}
static void nvmet_execute_set_features(struct nvmet_req *req)
{
struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
u32 cdw11 = le32_to_cpu(req->cmd->common.cdw11);
u16 status = 0;
u16 nsqr;
u16 ncqr;
if (!nvmet_check_transfer_len(req, 0))
return;
switch (cdw10 & 0xff) {
case NVME_FEAT_NUM_QUEUES:
ncqr = (cdw11 >> 16) & 0xffff;
nsqr = cdw11 & 0xffff;
if (ncqr == 0xffff || nsqr == 0xffff) {
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
nvmet_set_result(req,
(subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
break;
case NVME_FEAT_KATO:
status = nvmet_set_feat_kato(req);
break;
case NVME_FEAT_ASYNC_EVENT:
status = nvmet_set_feat_async_event(req, NVMET_AEN_CFG_ALL);
break;
case NVME_FEAT_HOST_ID:
status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
break;
case NVME_FEAT_WRITE_PROTECT:
status = nvmet_set_feat_write_protect(req);
break;
default:
req->error_loc = offsetof(struct nvme_common_command, cdw10);
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
nvmet_req_complete(req, status);
}
static u16 nvmet_get_feat_write_protect(struct nvmet_req *req)
{
struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
u32 result;
req->ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->common.nsid);
if (!req->ns) {
req->error_loc = offsetof(struct nvme_common_command, nsid);
return NVME_SC_INVALID_NS | NVME_SC_DNR;
}
mutex_lock(&subsys->lock);
if (req->ns->readonly == true)
result = NVME_NS_WRITE_PROTECT;
else
result = NVME_NS_NO_WRITE_PROTECT;
nvmet_set_result(req, result);
mutex_unlock(&subsys->lock);
return 0;
}
void nvmet_get_feat_kato(struct nvmet_req *req)
{
nvmet_set_result(req, req->sq->ctrl->kato * 1000);
}
void nvmet_get_feat_async_event(struct nvmet_req *req)
{
nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled));
}
static void nvmet_execute_get_features(struct nvmet_req *req)
{
struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
u16 status = 0;
if (!nvmet_check_transfer_len(req, nvmet_feat_data_len(req, cdw10)))
return;
switch (cdw10 & 0xff) {
/*
* These features are mandatory in the spec, but we don't
* have a useful way to implement them. We'll eventually
* need to come up with some fake values for these.
*/
#if 0
case NVME_FEAT_ARBITRATION:
break;
case NVME_FEAT_POWER_MGMT:
break;
case NVME_FEAT_TEMP_THRESH:
break;
case NVME_FEAT_ERR_RECOVERY:
break;
case NVME_FEAT_IRQ_COALESCE:
break;
case NVME_FEAT_IRQ_CONFIG:
break;
case NVME_FEAT_WRITE_ATOMIC:
break;
#endif
case NVME_FEAT_ASYNC_EVENT:
nvmet_get_feat_async_event(req);
break;
case NVME_FEAT_VOLATILE_WC:
nvmet_set_result(req, 1);
break;
case NVME_FEAT_NUM_QUEUES:
nvmet_set_result(req,
(subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
break;
case NVME_FEAT_KATO:
nvmet_get_feat_kato(req);
break;
case NVME_FEAT_HOST_ID:
/* need 128-bit host identifier flag */
if (!(req->cmd->common.cdw11 & cpu_to_le32(1 << 0))) {
req->error_loc =
offsetof(struct nvme_common_command, cdw11);
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
sizeof(req->sq->ctrl->hostid));
break;
case NVME_FEAT_WRITE_PROTECT:
status = nvmet_get_feat_write_protect(req);
break;
default:
req->error_loc =
offsetof(struct nvme_common_command, cdw10);
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
nvmet_req_complete(req, status);
}
void nvmet_execute_async_event(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
if (!nvmet_check_transfer_len(req, 0))
return;
mutex_lock(&ctrl->lock);
if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
mutex_unlock(&ctrl->lock);
nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
return;
}
ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
mutex_unlock(&ctrl->lock);
schedule_work(&ctrl->async_event_work);
}
void nvmet_execute_keep_alive(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
if (!nvmet_check_transfer_len(req, 0))
return;
pr_debug("ctrl %d update keep-alive timer for %d secs\n",
ctrl->cntlid, ctrl->kato);
mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
nvmet_req_complete(req, 0);
}
u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
u16 ret;
if (nvme_is_fabrics(cmd))
return nvmet_parse_fabrics_cmd(req);
if (req->sq->ctrl->subsys->type == NVME_NQN_DISC)
return nvmet_parse_discovery_cmd(req);
ret = nvmet_check_ctrl_status(req, cmd);
if (unlikely(ret))
return ret;
switch (cmd->common.opcode) {
case nvme_admin_get_log_page:
req->execute = nvmet_execute_get_log_page;
return 0;
case nvme_admin_identify:
req->execute = nvmet_execute_identify;
return 0;
case nvme_admin_abort_cmd:
req->execute = nvmet_execute_abort;
return 0;
case nvme_admin_set_features:
req->execute = nvmet_execute_set_features;
return 0;
case nvme_admin_get_features:
req->execute = nvmet_execute_get_features;
return 0;
case nvme_admin_async_event:
req->execute = nvmet_execute_async_event;
return 0;
case nvme_admin_keep_alive:
req->execute = nvmet_execute_keep_alive;
return 0;
}
pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
req->sq->qid);
req->error_loc = offsetof(struct nvme_common_command, opcode);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}