![Jens Axboe](/assets/img/avatar_default.png)
We've added a considerable amount of fixes for stalls and issues with the blk-mq scheduling in the 4.11 series since forking off the for-4.12/block branch. We need to do improvements on top of that for 4.12, so pull in the previous fixes to make our lives easier going forward. Signed-off-by: Jens Axboe <axboe@fb.com>
546 lines
14 KiB
C
546 lines
14 KiB
C
/*
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* NVMe admin command implementation.
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* Copyright (c) 2015-2016 HGST, a Western Digital Company.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/rculist.h>
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#include <generated/utsrelease.h>
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#include <asm/unaligned.h>
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#include "nvmet.h"
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u32 nvmet_get_log_page_len(struct nvme_command *cmd)
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{
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u32 len = le16_to_cpu(cmd->get_log_page.numdu);
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len <<= 16;
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len += le16_to_cpu(cmd->get_log_page.numdl);
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/* NUMD is a 0's based value */
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len += 1;
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len *= sizeof(u32);
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return len;
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}
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static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
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struct nvme_smart_log *slog)
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{
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u16 status;
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struct nvmet_ns *ns;
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u64 host_reads, host_writes, data_units_read, data_units_written;
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status = NVME_SC_SUCCESS;
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ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
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if (!ns) {
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status = NVME_SC_INVALID_NS;
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pr_err("nvmet : Could not find namespace id : %d\n",
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le32_to_cpu(req->cmd->get_log_page.nsid));
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goto out;
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}
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host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
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data_units_read = part_stat_read(ns->bdev->bd_part, sectors[READ]);
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host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
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data_units_written = part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
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put_unaligned_le64(host_reads, &slog->host_reads[0]);
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put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
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put_unaligned_le64(host_writes, &slog->host_writes[0]);
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put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
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nvmet_put_namespace(ns);
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out:
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return status;
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}
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static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
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struct nvme_smart_log *slog)
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{
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u16 status;
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u64 host_reads = 0, host_writes = 0;
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u64 data_units_read = 0, data_units_written = 0;
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struct nvmet_ns *ns;
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struct nvmet_ctrl *ctrl;
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status = NVME_SC_SUCCESS;
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ctrl = req->sq->ctrl;
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rcu_read_lock();
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list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
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host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
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data_units_read +=
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part_stat_read(ns->bdev->bd_part, sectors[READ]);
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host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
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data_units_written +=
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part_stat_read(ns->bdev->bd_part, sectors[WRITE]);
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}
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rcu_read_unlock();
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put_unaligned_le64(host_reads, &slog->host_reads[0]);
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put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
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put_unaligned_le64(host_writes, &slog->host_writes[0]);
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put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
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return status;
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}
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static u16 nvmet_get_smart_log(struct nvmet_req *req,
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struct nvme_smart_log *slog)
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{
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u16 status;
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WARN_ON(req == NULL || slog == NULL);
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if (req->cmd->get_log_page.nsid == cpu_to_le32(0xFFFFFFFF))
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status = nvmet_get_smart_log_all(req, slog);
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else
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status = nvmet_get_smart_log_nsid(req, slog);
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return status;
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}
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static void nvmet_execute_get_log_page(struct nvmet_req *req)
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{
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struct nvme_smart_log *smart_log;
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size_t data_len = nvmet_get_log_page_len(req->cmd);
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void *buf;
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u16 status = 0;
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buf = kzalloc(data_len, GFP_KERNEL);
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if (!buf) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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switch (req->cmd->get_log_page.lid) {
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case NVME_LOG_ERROR:
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/*
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* We currently never set the More bit in the status field,
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* so all error log entries are invalid and can be zeroed out.
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* This is called a minum viable implementation (TM) of this
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* mandatory log page.
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*/
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break;
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case NVME_LOG_SMART:
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/*
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* XXX: fill out actual smart log
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*
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* We might have a hard time coming up with useful values for
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* many of the fields, and even when we have useful data
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* available (e.g. units or commands read/written) those aren't
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* persistent over power loss.
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*/
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if (data_len != sizeof(*smart_log)) {
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status = NVME_SC_INTERNAL;
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goto err;
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}
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smart_log = buf;
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status = nvmet_get_smart_log(req, smart_log);
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if (status) {
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memset(buf, '\0', data_len);
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goto err;
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}
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break;
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case NVME_LOG_FW_SLOT:
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/*
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* We only support a single firmware slot which always is
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* active, so we can zero out the whole firmware slot log and
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* still claim to fully implement this mandatory log page.
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*/
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break;
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default:
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BUG();
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}
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status = nvmet_copy_to_sgl(req, 0, buf, data_len);
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err:
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kfree(buf);
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out:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvme_id_ctrl *id;
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u16 status = 0;
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id = kzalloc(sizeof(*id), GFP_KERNEL);
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if (!id) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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/* XXX: figure out how to assign real vendors IDs. */
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id->vid = 0;
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id->ssvid = 0;
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memset(id->sn, ' ', sizeof(id->sn));
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snprintf(id->sn, sizeof(id->sn), "%llx", ctrl->serial);
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memset(id->mn, ' ', sizeof(id->mn));
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strncpy((char *)id->mn, "Linux", sizeof(id->mn));
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memset(id->fr, ' ', sizeof(id->fr));
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strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));
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id->rab = 6;
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/*
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* XXX: figure out how we can assign a IEEE OUI, but until then
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* the safest is to leave it as zeroes.
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*/
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/* we support multiple ports and multiples hosts: */
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id->cmic = (1 << 0) | (1 << 1);
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/* no limit on data transfer sizes for now */
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id->mdts = 0;
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id->cntlid = cpu_to_le16(ctrl->cntlid);
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id->ver = cpu_to_le32(ctrl->subsys->ver);
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/* XXX: figure out what to do about RTD3R/RTD3 */
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id->oaes = cpu_to_le32(1 << 8);
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id->ctratt = cpu_to_le32(1 << 0);
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id->oacs = 0;
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/*
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* We don't really have a practical limit on the number of abort
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* comands. But we don't do anything useful for abort either, so
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* no point in allowing more abort commands than the spec requires.
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*/
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id->acl = 3;
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id->aerl = NVMET_ASYNC_EVENTS - 1;
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/* first slot is read-only, only one slot supported */
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id->frmw = (1 << 0) | (1 << 1);
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id->lpa = (1 << 0) | (1 << 2);
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id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
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id->npss = 0;
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/* We support keep-alive timeout in granularity of seconds */
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id->kas = cpu_to_le16(NVMET_KAS);
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id->sqes = (0x6 << 4) | 0x6;
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id->cqes = (0x4 << 4) | 0x4;
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/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
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id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
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id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
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id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
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NVME_CTRL_ONCS_WRITE_ZEROES);
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/* XXX: don't report vwc if the underlying device is write through */
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id->vwc = NVME_CTRL_VWC_PRESENT;
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/*
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* We can't support atomic writes bigger than a LBA without support
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* from the backend device.
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*/
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id->awun = 0;
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id->awupf = 0;
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id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
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if (ctrl->ops->has_keyed_sgls)
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id->sgls |= cpu_to_le32(1 << 2);
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if (ctrl->ops->sqe_inline_size)
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id->sgls |= cpu_to_le32(1 << 20);
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strcpy(id->subnqn, ctrl->subsys->subsysnqn);
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/* Max command capsule size is sqe + single page of in-capsule data */
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id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
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ctrl->ops->sqe_inline_size) / 16);
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/* Max response capsule size is cqe */
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id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
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id->msdbd = ctrl->ops->msdbd;
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/*
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* Meh, we don't really support any power state. Fake up the same
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* values that qemu does.
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*/
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id->psd[0].max_power = cpu_to_le16(0x9c4);
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id->psd[0].entry_lat = cpu_to_le32(0x10);
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id->psd[0].exit_lat = cpu_to_le32(0x4);
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status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
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kfree(id);
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out:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_identify_ns(struct nvmet_req *req)
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{
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struct nvmet_ns *ns;
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struct nvme_id_ns *id;
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u16 status = 0;
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ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
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if (!ns) {
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status = NVME_SC_INVALID_NS | NVME_SC_DNR;
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goto out;
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}
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id = kzalloc(sizeof(*id), GFP_KERNEL);
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if (!id) {
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status = NVME_SC_INTERNAL;
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goto out_put_ns;
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}
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/*
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* nuse = ncap = nsze isn't aways true, but we have no way to find
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* that out from the underlying device.
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*/
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id->ncap = id->nuse = id->nsze =
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cpu_to_le64(ns->size >> ns->blksize_shift);
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/*
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* We just provide a single LBA format that matches what the
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* underlying device reports.
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*/
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id->nlbaf = 0;
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id->flbas = 0;
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/*
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* Our namespace might always be shared. Not just with other
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* controllers, but also with any other user of the block device.
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*/
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id->nmic = (1 << 0);
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memcpy(&id->nguid, &ns->nguid, sizeof(uuid_le));
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id->lbaf[0].ds = ns->blksize_shift;
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status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
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kfree(id);
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out_put_ns:
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nvmet_put_namespace(ns);
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out:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_identify_nslist(struct nvmet_req *req)
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{
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static const int buf_size = 4096;
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvmet_ns *ns;
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u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
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__le32 *list;
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u16 status = 0;
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int i = 0;
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list = kzalloc(buf_size, GFP_KERNEL);
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if (!list) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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rcu_read_lock();
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list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
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if (ns->nsid <= min_nsid)
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continue;
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list[i++] = cpu_to_le32(ns->nsid);
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if (i == buf_size / sizeof(__le32))
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break;
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}
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rcu_read_unlock();
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status = nvmet_copy_to_sgl(req, 0, list, buf_size);
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kfree(list);
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out:
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nvmet_req_complete(req, status);
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}
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/*
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* A "mimimum viable" abort implementation: the command is mandatory in the
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* spec, but we are not required to do any useful work. We couldn't really
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* do a useful abort, so don't bother even with waiting for the command
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* to be exectuted and return immediately telling the command to abort
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* wasn't found.
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*/
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static void nvmet_execute_abort(struct nvmet_req *req)
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{
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nvmet_set_result(req, 1);
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nvmet_req_complete(req, 0);
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}
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static void nvmet_execute_set_features(struct nvmet_req *req)
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{
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struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
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u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
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u32 val32;
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u16 status = 0;
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switch (cdw10 & 0xf) {
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case NVME_FEAT_NUM_QUEUES:
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nvmet_set_result(req,
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(subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
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break;
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case NVME_FEAT_KATO:
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val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
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req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
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nvmet_set_result(req, req->sq->ctrl->kato);
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break;
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default:
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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break;
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}
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_get_features(struct nvmet_req *req)
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{
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struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
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u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
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u16 status = 0;
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switch (cdw10 & 0xf) {
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/*
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* These features are mandatory in the spec, but we don't
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* have a useful way to implement them. We'll eventually
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* need to come up with some fake values for these.
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*/
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#if 0
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case NVME_FEAT_ARBITRATION:
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break;
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case NVME_FEAT_POWER_MGMT:
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break;
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case NVME_FEAT_TEMP_THRESH:
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break;
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case NVME_FEAT_ERR_RECOVERY:
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break;
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case NVME_FEAT_IRQ_COALESCE:
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break;
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case NVME_FEAT_IRQ_CONFIG:
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break;
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case NVME_FEAT_WRITE_ATOMIC:
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break;
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case NVME_FEAT_ASYNC_EVENT:
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break;
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#endif
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case NVME_FEAT_VOLATILE_WC:
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nvmet_set_result(req, 1);
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break;
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case NVME_FEAT_NUM_QUEUES:
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nvmet_set_result(req,
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(subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
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break;
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case NVME_FEAT_KATO:
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nvmet_set_result(req, req->sq->ctrl->kato * 1000);
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break;
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default:
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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break;
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}
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_async_event(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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mutex_lock(&ctrl->lock);
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if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
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mutex_unlock(&ctrl->lock);
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nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
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return;
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}
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ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
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mutex_unlock(&ctrl->lock);
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schedule_work(&ctrl->async_event_work);
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}
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static void nvmet_execute_keep_alive(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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pr_debug("ctrl %d update keep-alive timer for %d secs\n",
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ctrl->cntlid, ctrl->kato);
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mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
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nvmet_req_complete(req, 0);
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}
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u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
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{
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struct nvme_command *cmd = req->cmd;
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u16 ret;
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req->ns = NULL;
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ret = nvmet_check_ctrl_status(req, cmd);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
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 NVME_LOG_ERROR:
|
|
case NVME_LOG_SMART:
|
|
case NVME_LOG_FW_SLOT:
|
|
req->execute = nvmet_execute_get_log_page;
|
|
return 0;
|
|
}
|
|
break;
|
|
case nvme_admin_identify:
|
|
req->data_len = 4096;
|
|
switch (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("unhandled cmd %d on qid %d\n", cmd->common.opcode,
|
|
req->sq->qid);
|
|
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
|
|
}
|