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Release 4.14 drivers/nvme/target/admin-cmd.c

/*
 * 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 <linux/rculist.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; }

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Christoph Hellwig52100.00%1100.00%
Total52100.00%1100.00%


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 : Could 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; }

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Chaitanya Kulkarni21199.53%150.00%
Colin Ian King10.47%150.00%
Total212100.00%2100.00%


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; }

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Chaitanya Kulkarni194100.00%1100.00%
Total194100.00%1100.00%


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 == cpu_to_le32(NVME_NSID_ALL)) status = nvmet_get_smart_log_all(req, slog); else status = nvmet_get_smart_log_nsid(req, slog); return status; }

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Chaitanya Kulkarni6394.03%133.33%
Christoph Hellwig45.97%266.67%
Total67100.00%3100.00%


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 NVME_LOG_ERROR: /* * 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 NVME_LOG_SMART: /* * 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 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. */ break; default: BUG(); } status = nvmet_copy_to_sgl(req, 0, buf, data_len); err: kfree(buf); out: nvmet_req_complete(req, status); }

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Christoph Hellwig10864.29%133.33%
Chaitanya Kulkarni5733.93%133.33%
Max Gurtovoy31.79%133.33%
Total168100.00%3100.00%


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; bin2hex(id->sn, &ctrl->subsys->serial, min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2)); memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' '); 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 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 | 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 (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); }

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Christoph Hellwig51888.85%228.57%
Martin Wilck6110.46%228.57%
Chaitanya Kulkarni20.34%114.29%
Sagi Grimberg10.17%114.29%
Johannes Thumshirn10.17%114.29%
Total583100.00%7100.00%


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); }

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Christoph Hellwig205100.00%1100.00%
Total205100.00%1100.00%


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); }

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Christoph Hellwig16199.38%150.00%
Johannes Thumshirn10.62%150.00%
Total162100.00%2100.00%


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; }

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Johannes Thumshirn106100.00%1100.00%
Total106100.00%1100.00%


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) { 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); }

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Johannes Thumshirn199100.00%1100.00%
Total199100.00%1100.00%

/* * 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); }

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Christoph Hellwig25100.00%1100.00%
Total25100.00%1100.00%


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 & 0xff) { 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; case NVME_FEAT_HOST_ID: status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; break; default: status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; break; } nvmet_req_complete(req, status); }

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Christoph Hellwig14188.68%133.33%
Omri Mann116.92%133.33%
Daniel Verkamp74.40%133.33%
Total159100.00%3100.00%


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 & 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; 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; case NVME_FEAT_HOST_ID: /* need 128-bit host identifier flag */ if (!(req->cmd->common.cdw10[1] & cpu_to_le32(1 << 0))) { 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; default: status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; break; } nvmet_req_complete(req, status); }

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Christoph Hellwig13466.67%150.00%
Omri Mann6733.33%150.00%
Total201100.00%2100.00%


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); }

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Christoph Hellwig86100.00%1100.00%
Total86100.00%1100.00%


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); }

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Christoph Hellwig58100.00%1100.00%
Total58100.00%1100.00%


u16 nvmet_parse_admin_cmd(struct nvmet_req *req) { struct nvme_command *cmd = req->cmd; u16 ret; req->ns = NULL; 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 = NVME_IDENTIFY_DATA_SIZE; 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; case NVME_ID_CNS_NS_DESC_LIST: req->execute = nvmet_execute_identify_desclist; 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; }

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Christoph Hellwig24688.49%233.33%
Parav Pandit165.76%116.67%
Johannes Thumshirn134.68%233.33%
Max Gurtovoy31.08%116.67%
Total278100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig175663.19%526.32%
Chaitanya Kulkarni53019.07%210.53%
Johannes Thumshirn32011.51%315.79%
Omri Mann782.81%15.26%
Martin Wilck612.20%210.53%
Parav Pandit160.58%15.26%
Daniel Verkamp70.25%15.26%
Max Gurtovoy60.22%15.26%
Ingo Molnar30.11%15.26%
Sagi Grimberg10.04%15.26%
Colin Ian King10.04%15.26%
Total2779100.00%19100.00%
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