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|
/*
* NVMe admin 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/module.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 u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
u16 status;
struct nvmet_ns *ns;
u64 host_reads, host_writes, data_units_read, data_units_written;
status = NVME_SC_SUCCESS;
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
if (!ns) {
status = NVME_SC_INVALID_NS;
pr_err("nvmet : Counld not find namespace id : %d\n",
le32_to_cpu(req->cmd->get_log_page.nsid));
goto out;
}
host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
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]);
nvmet_put_namespace(ns);
out:
return status;
}
static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
u16 status;
u64 host_reads = 0, host_writes = 0;
u64 data_units_read = 0, data_units_written = 0;
struct nvmet_ns *ns;
struct nvmet_ctrl *ctrl;
status = NVME_SC_SUCCESS;
ctrl = req->sq->ctrl;
rcu_read_lock();
list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
data_units_read +=
part_stat_read(ns->bdev->bd_part, sectors[READ]);
host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
data_units_written +=
part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
}
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 status;
}
static u16 nvmet_get_smart_log(struct nvmet_req *req,
struct nvme_smart_log *slog)
{
u16 status;
WARN_ON(req == NULL || slog == NULL);
if (req->cmd->get_log_page.nsid == 0xFFFFFFFF)
status = nvmet_get_smart_log_all(req, slog);
else
status = nvmet_get_smart_log_nsid(req, slog);
return status;
}
static void nvmet_execute_get_log_page(struct nvmet_req *req)
{
struct nvme_smart_log *smart_log;
size_t data_len = nvmet_get_log_page_len(req->cmd);
void *buf;
u16 status = 0;
buf = kzalloc(data_len, GFP_KERNEL);
if (!buf) {
status = NVME_SC_INTERNAL;
goto out;
}
switch (req->cmd->get_log_page.lid) {
case 0x01:
/*
* We currently never set the More bit in the status field,
* so all error log entries are invalid and can be zeroed out.
* This is called a minum viable implementation (TM) of this
* mandatory log page.
*/
break;
case 0x02:
/*
* XXX: fill out actual smart log
*
* We might have a hard time coming up with useful values for
* many of the fields, and even when we have useful data
* available (e.g. units or commands read/written) those aren't
* persistent over power loss.
*/
if (data_len != sizeof(*smart_log)) {
status = NVME_SC_INTERNAL;
goto err;
}
smart_log = buf;
status = nvmet_get_smart_log(req, smart_log);
if (status) {
memset(buf, '\0', data_len);
goto err;
}
break;
case 0x03:
/*
* 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.
*/
break;
default:
BUG();
}
status = nvmet_copy_to_sgl(req, 0, buf, data_len);
err:
kfree(buf);
out:
nvmet_req_complete(req, status);
}
static void copy_and_pad(char *dst, int dst_len, const char *src, int src_len)
{
int len = min(src_len, dst_len);
memcpy(dst, src, len);
if (dst_len > len)
memset(dst + len, ' ', dst_len - len);
}
static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl *id;
u16 status = 0;
const char model[] = "Linux";
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));
copy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1);
copy_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 and multiples hosts: */
id->cmic = (1 << 0) | (1 << 1);
/* no limit on data transfer sizes for now */
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(1 << 8);
id->ctratt = cpu_to_le32(1 << 0);
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 << 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->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM);
/* 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 (ctrl->ops->sqe_inline_size)
id->sgls |= cpu_to_le32(1 << 20);
strcpy(id->subnqn, ctrl->subsys->subsysnqn);
/* Max command capsule size is sqe + single page of in-capsule data */
id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
ctrl->ops->sqe_inline_size) / 16);
/* Max response capsule size is cqe */
id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
id->msdbd = ctrl->ops->msdbd;
/*
* 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);
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_ns *ns;
struct nvme_id_ns *id;
u16 status = 0;
ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
if (!ns) {
status = NVME_SC_INVALID_NS | NVME_SC_DNR;
goto out;
}
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
status = NVME_SC_INTERNAL;
goto out_put_ns;
}
/*
* nuse = ncap = nsze isn't aways true, but we have no way to find
* that out from the underlying device.
*/
id->ncap = id->nuse = id->nsze =
cpu_to_le64(ns->size >> ns->blksize_shift);
/*
* 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);
memcpy(&id->nguid, &ns->nguid, sizeof(uuid_le));
id->lbaf[0].ds = ns->blksize_shift;
status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
kfree(id);
out_put_ns:
nvmet_put_namespace(ns);
out:
nvmet_req_complete(req, status);
}
static void nvmet_execute_identify_nslist(struct nvmet_req *req)
{
static const int buf_size = 4096;
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);
}
/*
* A "mimimum 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)
{
nvmet_set_result(req, 1);
nvmet_req_complete(req, 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[0]);
u32 val32;
u16 status = 0;
switch (cdw10 & 0xf) {
case NVME_FEAT_NUM_QUEUES:
nvmet_set_result(req,
(subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
break;
case NVME_FEAT_KATO:
val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
nvmet_set_result(req, req->sq->ctrl->kato);
break;
default:
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
nvmet_req_complete(req, status);
}
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[0]);
u16 status = 0;
switch (cdw10 & 0xf) {
/*
* 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;
case NVME_FEAT_ASYNC_EVENT:
break;
#endif
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_set_result(req, req->sq->ctrl->kato * 1000);
break;
default:
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
break;
}
nvmet_req_complete(req, status);
}
static void nvmet_execute_async_event(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
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);
}
static void nvmet_execute_keep_alive(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
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);
}
int nvmet_parse_admin_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
req->ns = NULL;
if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) {
pr_err("nvmet: got admin cmd %d while CC.EN == 0\n",
cmd->common.opcode);
return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
}
if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
pr_err("nvmet: got admin cmd %d while CSTS.RDY == 0\n",
cmd->common.opcode);
return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
}
switch (cmd->common.opcode) {
case nvme_admin_get_log_page:
req->data_len = nvmet_get_log_page_len(cmd);
switch (cmd->get_log_page.lid) {
case 0x01:
case 0x02:
case 0x03:
req->execute = nvmet_execute_get_log_page;
return 0;
}
break;
case nvme_admin_identify:
req->data_len = 4096;
switch (le32_to_cpu(cmd->identify.cns)) {
case NVME_ID_CNS_NS:
req->execute = nvmet_execute_identify_ns;
return 0;
case NVME_ID_CNS_CTRL:
req->execute = nvmet_execute_identify_ctrl;
return 0;
case NVME_ID_CNS_NS_ACTIVE_LIST:
req->execute = nvmet_execute_identify_nslist;
return 0;
}
break;
case nvme_admin_abort_cmd:
req->execute = nvmet_execute_abort;
req->data_len = 0;
return 0;
case nvme_admin_set_features:
req->execute = nvmet_execute_set_features;
req->data_len = 0;
return 0;
case nvme_admin_get_features:
req->execute = nvmet_execute_get_features;
req->data_len = 0;
return 0;
case nvme_admin_async_event:
req->execute = nvmet_execute_async_event;
req->data_len = 0;
return 0;
case nvme_admin_keep_alive:
req->execute = nvmet_execute_keep_alive;
req->data_len = 0;
return 0;
}
pr_err("nvmet: unhandled cmd %d\n", cmd->common.opcode);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
|