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![Changcheng Deng](/assets/img/avatar_default.png)
Remove unneeded variable and directly return 0. Reported-by: Zeal Robot <zealci@zte.com.cn> Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn> Signed-off-by: Christoph Hellwig <hch@lst.de>
1202 lines
30 KiB
C
1202 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NVMe over Fabrics common host code.
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* Copyright (c) 2015-2016 HGST, a Western Digital Company.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/parser.h>
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#include <linux/seq_file.h>
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#include "nvme.h"
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#include "fabrics.h"
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static LIST_HEAD(nvmf_transports);
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static DECLARE_RWSEM(nvmf_transports_rwsem);
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static LIST_HEAD(nvmf_hosts);
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static DEFINE_MUTEX(nvmf_hosts_mutex);
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static struct nvmf_host *nvmf_default_host;
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static struct nvmf_host *__nvmf_host_find(const char *hostnqn)
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{
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struct nvmf_host *host;
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list_for_each_entry(host, &nvmf_hosts, list) {
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if (!strcmp(host->nqn, hostnqn))
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return host;
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}
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return NULL;
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}
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static struct nvmf_host *nvmf_host_add(const char *hostnqn)
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{
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struct nvmf_host *host;
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mutex_lock(&nvmf_hosts_mutex);
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host = __nvmf_host_find(hostnqn);
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if (host) {
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kref_get(&host->ref);
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goto out_unlock;
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}
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host = kmalloc(sizeof(*host), GFP_KERNEL);
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if (!host)
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goto out_unlock;
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kref_init(&host->ref);
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strlcpy(host->nqn, hostnqn, NVMF_NQN_SIZE);
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list_add_tail(&host->list, &nvmf_hosts);
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out_unlock:
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mutex_unlock(&nvmf_hosts_mutex);
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return host;
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}
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static struct nvmf_host *nvmf_host_default(void)
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{
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struct nvmf_host *host;
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host = kmalloc(sizeof(*host), GFP_KERNEL);
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if (!host)
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return NULL;
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kref_init(&host->ref);
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uuid_gen(&host->id);
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snprintf(host->nqn, NVMF_NQN_SIZE,
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"nqn.2014-08.org.nvmexpress:uuid:%pUb", &host->id);
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mutex_lock(&nvmf_hosts_mutex);
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list_add_tail(&host->list, &nvmf_hosts);
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mutex_unlock(&nvmf_hosts_mutex);
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return host;
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}
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static void nvmf_host_destroy(struct kref *ref)
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{
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struct nvmf_host *host = container_of(ref, struct nvmf_host, ref);
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mutex_lock(&nvmf_hosts_mutex);
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list_del(&host->list);
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mutex_unlock(&nvmf_hosts_mutex);
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kfree(host);
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}
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static void nvmf_host_put(struct nvmf_host *host)
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{
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if (host)
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kref_put(&host->ref, nvmf_host_destroy);
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}
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/**
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* nvmf_get_address() - Get address/port
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* @ctrl: Host NVMe controller instance which we got the address
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* @buf: OUTPUT parameter that will contain the address/port
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* @size: buffer size
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*/
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int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
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{
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int len = 0;
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if (ctrl->opts->mask & NVMF_OPT_TRADDR)
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len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
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if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
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len += scnprintf(buf + len, size - len, "%strsvcid=%s",
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(len) ? "," : "", ctrl->opts->trsvcid);
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if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
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len += scnprintf(buf + len, size - len, "%shost_traddr=%s",
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(len) ? "," : "", ctrl->opts->host_traddr);
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if (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)
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len += scnprintf(buf + len, size - len, "%shost_iface=%s",
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(len) ? "," : "", ctrl->opts->host_iface);
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len += scnprintf(buf + len, size - len, "\n");
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return len;
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}
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EXPORT_SYMBOL_GPL(nvmf_get_address);
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/**
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* nvmf_reg_read32() - NVMe Fabrics "Property Get" API function.
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* @ctrl: Host NVMe controller instance maintaining the admin
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* queue used to submit the property read command to
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* the allocated NVMe controller resource on the target system.
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* @off: Starting offset value of the targeted property
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* register (see the fabrics section of the NVMe standard).
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* @val: OUTPUT parameter that will contain the value of
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* the property after a successful read.
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*
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* Used by the host system to retrieve a 32-bit capsule property value
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* from an NVMe controller on the target system.
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*
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* ("Capsule property" is an "PCIe register concept" applied to the
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* NVMe fabrics space.)
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*
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* Return:
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* 0: successful read
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* > 0: NVMe error status code
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* < 0: Linux errno error code
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*/
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int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
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{
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struct nvme_command cmd;
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union nvme_result res;
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int ret;
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memset(&cmd, 0, sizeof(cmd));
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cmd.prop_get.opcode = nvme_fabrics_command;
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cmd.prop_get.fctype = nvme_fabrics_type_property_get;
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cmd.prop_get.offset = cpu_to_le32(off);
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ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0, 0,
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NVME_QID_ANY, 0, 0);
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if (ret >= 0)
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*val = le64_to_cpu(res.u64);
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if (unlikely(ret != 0))
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dev_err(ctrl->device,
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"Property Get error: %d, offset %#x\n",
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ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmf_reg_read32);
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/**
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* nvmf_reg_read64() - NVMe Fabrics "Property Get" API function.
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* @ctrl: Host NVMe controller instance maintaining the admin
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* queue used to submit the property read command to
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* the allocated controller resource on the target system.
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* @off: Starting offset value of the targeted property
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* register (see the fabrics section of the NVMe standard).
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* @val: OUTPUT parameter that will contain the value of
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* the property after a successful read.
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*
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* Used by the host system to retrieve a 64-bit capsule property value
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* from an NVMe controller on the target system.
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*
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* ("Capsule property" is an "PCIe register concept" applied to the
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* NVMe fabrics space.)
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*
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* Return:
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* 0: successful read
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* > 0: NVMe error status code
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* < 0: Linux errno error code
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*/
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int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
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{
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struct nvme_command cmd = { };
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union nvme_result res;
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int ret;
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cmd.prop_get.opcode = nvme_fabrics_command;
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cmd.prop_get.fctype = nvme_fabrics_type_property_get;
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cmd.prop_get.attrib = 1;
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cmd.prop_get.offset = cpu_to_le32(off);
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ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0, 0,
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NVME_QID_ANY, 0, 0);
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if (ret >= 0)
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*val = le64_to_cpu(res.u64);
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if (unlikely(ret != 0))
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dev_err(ctrl->device,
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"Property Get error: %d, offset %#x\n",
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ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmf_reg_read64);
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/**
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* nvmf_reg_write32() - NVMe Fabrics "Property Write" API function.
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* @ctrl: Host NVMe controller instance maintaining the admin
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* queue used to submit the property read command to
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* the allocated NVMe controller resource on the target system.
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* @off: Starting offset value of the targeted property
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* register (see the fabrics section of the NVMe standard).
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* @val: Input parameter that contains the value to be
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* written to the property.
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*
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* Used by the NVMe host system to write a 32-bit capsule property value
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* to an NVMe controller on the target system.
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*
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* ("Capsule property" is an "PCIe register concept" applied to the
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* NVMe fabrics space.)
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*
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* Return:
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* 0: successful write
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* > 0: NVMe error status code
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* < 0: Linux errno error code
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*/
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int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
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{
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struct nvme_command cmd = { };
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int ret;
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cmd.prop_set.opcode = nvme_fabrics_command;
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cmd.prop_set.fctype = nvme_fabrics_type_property_set;
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cmd.prop_set.attrib = 0;
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cmd.prop_set.offset = cpu_to_le32(off);
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cmd.prop_set.value = cpu_to_le64(val);
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ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, NULL, NULL, 0, 0,
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NVME_QID_ANY, 0, 0);
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if (unlikely(ret))
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dev_err(ctrl->device,
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"Property Set error: %d, offset %#x\n",
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ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmf_reg_write32);
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/**
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* nvmf_log_connect_error() - Error-parsing-diagnostic print out function for
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* connect() errors.
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* @ctrl: The specific /dev/nvmeX device that had the error.
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* @errval: Error code to be decoded in a more human-friendly
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* printout.
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* @offset: For use with the NVMe error code
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* NVME_SC_CONNECT_INVALID_PARAM.
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* @cmd: This is the SQE portion of a submission capsule.
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* @data: This is the "Data" portion of a submission capsule.
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*/
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static void nvmf_log_connect_error(struct nvme_ctrl *ctrl,
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int errval, int offset, struct nvme_command *cmd,
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struct nvmf_connect_data *data)
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{
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int err_sctype = errval & ~NVME_SC_DNR;
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switch (err_sctype) {
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case (NVME_SC_CONNECT_INVALID_PARAM):
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if (offset >> 16) {
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char *inv_data = "Connect Invalid Data Parameter";
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switch (offset & 0xffff) {
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case (offsetof(struct nvmf_connect_data, cntlid)):
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dev_err(ctrl->device,
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"%s, cntlid: %d\n",
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inv_data, data->cntlid);
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break;
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case (offsetof(struct nvmf_connect_data, hostnqn)):
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dev_err(ctrl->device,
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"%s, hostnqn \"%s\"\n",
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inv_data, data->hostnqn);
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break;
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case (offsetof(struct nvmf_connect_data, subsysnqn)):
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dev_err(ctrl->device,
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"%s, subsysnqn \"%s\"\n",
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inv_data, data->subsysnqn);
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break;
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default:
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dev_err(ctrl->device,
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"%s, starting byte offset: %d\n",
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inv_data, offset & 0xffff);
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break;
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}
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} else {
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char *inv_sqe = "Connect Invalid SQE Parameter";
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switch (offset) {
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case (offsetof(struct nvmf_connect_command, qid)):
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dev_err(ctrl->device,
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"%s, qid %d\n",
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inv_sqe, cmd->connect.qid);
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break;
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default:
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dev_err(ctrl->device,
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"%s, starting byte offset: %d\n",
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inv_sqe, offset);
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}
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}
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break;
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case NVME_SC_CONNECT_INVALID_HOST:
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dev_err(ctrl->device,
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"Connect for subsystem %s is not allowed, hostnqn: %s\n",
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data->subsysnqn, data->hostnqn);
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break;
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case NVME_SC_CONNECT_CTRL_BUSY:
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dev_err(ctrl->device,
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"Connect command failed: controller is busy or not available\n");
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break;
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case NVME_SC_CONNECT_FORMAT:
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dev_err(ctrl->device,
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"Connect incompatible format: %d",
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cmd->connect.recfmt);
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break;
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case NVME_SC_HOST_PATH_ERROR:
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dev_err(ctrl->device,
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"Connect command failed: host path error\n");
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break;
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default:
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dev_err(ctrl->device,
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"Connect command failed, error wo/DNR bit: %d\n",
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err_sctype);
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break;
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}
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}
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/**
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* nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect"
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* API function.
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* @ctrl: Host nvme controller instance used to request
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* a new NVMe controller allocation on the target
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* system and establish an NVMe Admin connection to
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* that controller.
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*
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* This function enables an NVMe host device to request a new allocation of
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* an NVMe controller resource on a target system as well establish a
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* fabrics-protocol connection of the NVMe Admin queue between the
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* host system device and the allocated NVMe controller on the
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* target system via a NVMe Fabrics "Connect" command.
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*
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* Return:
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* 0: success
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* > 0: NVMe error status code
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* < 0: Linux errno error code
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*
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*/
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int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
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{
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struct nvme_command cmd = { };
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union nvme_result res;
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struct nvmf_connect_data *data;
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int ret;
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cmd.connect.opcode = nvme_fabrics_command;
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cmd.connect.fctype = nvme_fabrics_type_connect;
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cmd.connect.qid = 0;
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cmd.connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
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/*
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* Set keep-alive timeout in seconds granularity (ms * 1000)
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*/
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cmd.connect.kato = cpu_to_le32(ctrl->kato * 1000);
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if (ctrl->opts->disable_sqflow)
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cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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uuid_copy(&data->hostid, &ctrl->opts->host->id);
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data->cntlid = cpu_to_le16(0xffff);
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strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
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strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
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ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res,
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data, sizeof(*data), 0, NVME_QID_ANY, 1,
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BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
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if (ret) {
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nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
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&cmd, data);
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goto out_free_data;
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}
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ctrl->cntlid = le16_to_cpu(res.u16);
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out_free_data:
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kfree(data);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue);
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/**
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* nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect"
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* API function.
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* @ctrl: Host nvme controller instance used to establish an
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* NVMe I/O queue connection to the already allocated NVMe
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* controller on the target system.
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* @qid: NVMe I/O queue number for the new I/O connection between
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* host and target (note qid == 0 is illegal as this is
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* the Admin queue, per NVMe standard).
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*
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* This function issues a fabrics-protocol connection
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* of a NVMe I/O queue (via NVMe Fabrics "Connect" command)
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* between the host system device and the allocated NVMe controller
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* on the target system.
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*
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* Return:
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* 0: success
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* > 0: NVMe error status code
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* < 0: Linux errno error code
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*/
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int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid)
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{
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struct nvme_command cmd = { };
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struct nvmf_connect_data *data;
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union nvme_result res;
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int ret;
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cmd.connect.opcode = nvme_fabrics_command;
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cmd.connect.fctype = nvme_fabrics_type_connect;
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cmd.connect.qid = cpu_to_le16(qid);
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cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize);
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if (ctrl->opts->disable_sqflow)
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cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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uuid_copy(&data->hostid, &ctrl->opts->host->id);
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data->cntlid = cpu_to_le16(ctrl->cntlid);
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strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
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strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
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ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res,
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data, sizeof(*data), 0, qid, 1,
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BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
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if (ret) {
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nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
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&cmd, data);
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}
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kfree(data);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nvmf_connect_io_queue);
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bool nvmf_should_reconnect(struct nvme_ctrl *ctrl)
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{
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if (ctrl->opts->max_reconnects == -1 ||
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ctrl->nr_reconnects < ctrl->opts->max_reconnects)
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return true;
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return false;
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}
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EXPORT_SYMBOL_GPL(nvmf_should_reconnect);
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|
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/**
|
|
* nvmf_register_transport() - NVMe Fabrics Library registration function.
|
|
* @ops: Transport ops instance to be registered to the
|
|
* common fabrics library.
|
|
*
|
|
* API function that registers the type of specific transport fabric
|
|
* being implemented to the common NVMe fabrics library. Part of
|
|
* the overall init sequence of starting up a fabrics driver.
|
|
*/
|
|
int nvmf_register_transport(struct nvmf_transport_ops *ops)
|
|
{
|
|
if (!ops->create_ctrl)
|
|
return -EINVAL;
|
|
|
|
down_write(&nvmf_transports_rwsem);
|
|
list_add_tail(&ops->entry, &nvmf_transports);
|
|
up_write(&nvmf_transports_rwsem);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmf_register_transport);
|
|
|
|
/**
|
|
* nvmf_unregister_transport() - NVMe Fabrics Library unregistration function.
|
|
* @ops: Transport ops instance to be unregistered from the
|
|
* common fabrics library.
|
|
*
|
|
* Fabrics API function that unregisters the type of specific transport
|
|
* fabric being implemented from the common NVMe fabrics library.
|
|
* Part of the overall exit sequence of unloading the implemented driver.
|
|
*/
|
|
void nvmf_unregister_transport(struct nvmf_transport_ops *ops)
|
|
{
|
|
down_write(&nvmf_transports_rwsem);
|
|
list_del(&ops->entry);
|
|
up_write(&nvmf_transports_rwsem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmf_unregister_transport);
|
|
|
|
static struct nvmf_transport_ops *nvmf_lookup_transport(
|
|
struct nvmf_ctrl_options *opts)
|
|
{
|
|
struct nvmf_transport_ops *ops;
|
|
|
|
lockdep_assert_held(&nvmf_transports_rwsem);
|
|
|
|
list_for_each_entry(ops, &nvmf_transports, entry) {
|
|
if (strcmp(ops->name, opts->transport) == 0)
|
|
return ops;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const match_table_t opt_tokens = {
|
|
{ NVMF_OPT_TRANSPORT, "transport=%s" },
|
|
{ NVMF_OPT_TRADDR, "traddr=%s" },
|
|
{ NVMF_OPT_TRSVCID, "trsvcid=%s" },
|
|
{ NVMF_OPT_NQN, "nqn=%s" },
|
|
{ NVMF_OPT_QUEUE_SIZE, "queue_size=%d" },
|
|
{ NVMF_OPT_NR_IO_QUEUES, "nr_io_queues=%d" },
|
|
{ NVMF_OPT_RECONNECT_DELAY, "reconnect_delay=%d" },
|
|
{ NVMF_OPT_CTRL_LOSS_TMO, "ctrl_loss_tmo=%d" },
|
|
{ NVMF_OPT_KATO, "keep_alive_tmo=%d" },
|
|
{ NVMF_OPT_HOSTNQN, "hostnqn=%s" },
|
|
{ NVMF_OPT_HOST_TRADDR, "host_traddr=%s" },
|
|
{ NVMF_OPT_HOST_IFACE, "host_iface=%s" },
|
|
{ NVMF_OPT_HOST_ID, "hostid=%s" },
|
|
{ NVMF_OPT_DUP_CONNECT, "duplicate_connect" },
|
|
{ NVMF_OPT_DISABLE_SQFLOW, "disable_sqflow" },
|
|
{ NVMF_OPT_HDR_DIGEST, "hdr_digest" },
|
|
{ NVMF_OPT_DATA_DIGEST, "data_digest" },
|
|
{ NVMF_OPT_NR_WRITE_QUEUES, "nr_write_queues=%d" },
|
|
{ NVMF_OPT_NR_POLL_QUEUES, "nr_poll_queues=%d" },
|
|
{ NVMF_OPT_TOS, "tos=%d" },
|
|
{ NVMF_OPT_FAIL_FAST_TMO, "fast_io_fail_tmo=%d" },
|
|
{ NVMF_OPT_DISCOVERY, "discovery" },
|
|
{ NVMF_OPT_ERR, NULL }
|
|
};
|
|
|
|
static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
|
|
const char *buf)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
char *options, *o, *p;
|
|
int token, ret = 0;
|
|
size_t nqnlen = 0;
|
|
int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO;
|
|
uuid_t hostid;
|
|
|
|
/* Set defaults */
|
|
opts->queue_size = NVMF_DEF_QUEUE_SIZE;
|
|
opts->nr_io_queues = num_online_cpus();
|
|
opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
|
|
opts->kato = 0;
|
|
opts->duplicate_connect = false;
|
|
opts->fast_io_fail_tmo = NVMF_DEF_FAIL_FAST_TMO;
|
|
opts->hdr_digest = false;
|
|
opts->data_digest = false;
|
|
opts->tos = -1; /* < 0 == use transport default */
|
|
|
|
options = o = kstrdup(buf, GFP_KERNEL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
|
|
uuid_gen(&hostid);
|
|
|
|
while ((p = strsep(&o, ",\n")) != NULL) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, opt_tokens, args);
|
|
opts->mask |= token;
|
|
switch (token) {
|
|
case NVMF_OPT_TRANSPORT:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->transport);
|
|
opts->transport = p;
|
|
break;
|
|
case NVMF_OPT_NQN:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->subsysnqn);
|
|
opts->subsysnqn = p;
|
|
nqnlen = strlen(opts->subsysnqn);
|
|
if (nqnlen >= NVMF_NQN_SIZE) {
|
|
pr_err("%s needs to be < %d bytes\n",
|
|
opts->subsysnqn, NVMF_NQN_SIZE);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->discovery_nqn =
|
|
!(strcmp(opts->subsysnqn,
|
|
NVME_DISC_SUBSYS_NAME));
|
|
break;
|
|
case NVMF_OPT_TRADDR:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->traddr);
|
|
opts->traddr = p;
|
|
break;
|
|
case NVMF_OPT_TRSVCID:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->trsvcid);
|
|
opts->trsvcid = p;
|
|
break;
|
|
case NVMF_OPT_QUEUE_SIZE:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token < NVMF_MIN_QUEUE_SIZE ||
|
|
token > NVMF_MAX_QUEUE_SIZE) {
|
|
pr_err("Invalid queue_size %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->queue_size = token;
|
|
break;
|
|
case NVMF_OPT_NR_IO_QUEUES:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token <= 0) {
|
|
pr_err("Invalid number of IOQs %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (opts->discovery_nqn) {
|
|
pr_debug("Ignoring nr_io_queues value for discovery controller\n");
|
|
break;
|
|
}
|
|
|
|
opts->nr_io_queues = min_t(unsigned int,
|
|
num_online_cpus(), token);
|
|
break;
|
|
case NVMF_OPT_KATO:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (token < 0) {
|
|
pr_err("Invalid keep_alive_tmo %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
} else if (token == 0 && !opts->discovery_nqn) {
|
|
/* Allowed for debug */
|
|
pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
|
|
}
|
|
opts->kato = token;
|
|
break;
|
|
case NVMF_OPT_CTRL_LOSS_TMO:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (token < 0)
|
|
pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n");
|
|
ctrl_loss_tmo = token;
|
|
break;
|
|
case NVMF_OPT_FAIL_FAST_TMO:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (token >= 0)
|
|
pr_warn("I/O fail on reconnect controller after %d sec\n",
|
|
token);
|
|
else
|
|
token = -1;
|
|
|
|
opts->fast_io_fail_tmo = token;
|
|
break;
|
|
case NVMF_OPT_HOSTNQN:
|
|
if (opts->host) {
|
|
pr_err("hostnqn already user-assigned: %s\n",
|
|
opts->host->nqn);
|
|
ret = -EADDRINUSE;
|
|
goto out;
|
|
}
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
nqnlen = strlen(p);
|
|
if (nqnlen >= NVMF_NQN_SIZE) {
|
|
pr_err("%s needs to be < %d bytes\n",
|
|
p, NVMF_NQN_SIZE);
|
|
kfree(p);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->host = nvmf_host_add(p);
|
|
kfree(p);
|
|
if (!opts->host) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
break;
|
|
case NVMF_OPT_RECONNECT_DELAY:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token <= 0) {
|
|
pr_err("Invalid reconnect_delay %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->reconnect_delay = token;
|
|
break;
|
|
case NVMF_OPT_HOST_TRADDR:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->host_traddr);
|
|
opts->host_traddr = p;
|
|
break;
|
|
case NVMF_OPT_HOST_IFACE:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(opts->host_iface);
|
|
opts->host_iface = p;
|
|
break;
|
|
case NVMF_OPT_HOST_ID:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ret = uuid_parse(p, &hostid);
|
|
if (ret) {
|
|
pr_err("Invalid hostid %s\n", p);
|
|
ret = -EINVAL;
|
|
kfree(p);
|
|
goto out;
|
|
}
|
|
kfree(p);
|
|
break;
|
|
case NVMF_OPT_DUP_CONNECT:
|
|
opts->duplicate_connect = true;
|
|
break;
|
|
case NVMF_OPT_DISABLE_SQFLOW:
|
|
opts->disable_sqflow = true;
|
|
break;
|
|
case NVMF_OPT_HDR_DIGEST:
|
|
opts->hdr_digest = true;
|
|
break;
|
|
case NVMF_OPT_DATA_DIGEST:
|
|
opts->data_digest = true;
|
|
break;
|
|
case NVMF_OPT_NR_WRITE_QUEUES:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token <= 0) {
|
|
pr_err("Invalid nr_write_queues %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->nr_write_queues = token;
|
|
break;
|
|
case NVMF_OPT_NR_POLL_QUEUES:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token <= 0) {
|
|
pr_err("Invalid nr_poll_queues %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
opts->nr_poll_queues = token;
|
|
break;
|
|
case NVMF_OPT_TOS:
|
|
if (match_int(args, &token)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token < 0) {
|
|
pr_err("Invalid type of service %d\n", token);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (token > 255) {
|
|
pr_warn("Clamping type of service to 255\n");
|
|
token = 255;
|
|
}
|
|
opts->tos = token;
|
|
break;
|
|
case NVMF_OPT_DISCOVERY:
|
|
opts->discovery_nqn = true;
|
|
break;
|
|
default:
|
|
pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
|
|
p);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (opts->discovery_nqn) {
|
|
opts->nr_io_queues = 0;
|
|
opts->nr_write_queues = 0;
|
|
opts->nr_poll_queues = 0;
|
|
opts->duplicate_connect = true;
|
|
} else {
|
|
if (!opts->kato)
|
|
opts->kato = NVME_DEFAULT_KATO;
|
|
}
|
|
if (ctrl_loss_tmo < 0) {
|
|
opts->max_reconnects = -1;
|
|
} else {
|
|
opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,
|
|
opts->reconnect_delay);
|
|
if (ctrl_loss_tmo < opts->fast_io_fail_tmo)
|
|
pr_warn("failfast tmo (%d) larger than controller loss tmo (%d)\n",
|
|
opts->fast_io_fail_tmo, ctrl_loss_tmo);
|
|
}
|
|
|
|
if (!opts->host) {
|
|
kref_get(&nvmf_default_host->ref);
|
|
opts->host = nvmf_default_host;
|
|
}
|
|
|
|
uuid_copy(&opts->host->id, &hostid);
|
|
|
|
out:
|
|
kfree(options);
|
|
return ret;
|
|
}
|
|
|
|
static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts,
|
|
unsigned int required_opts)
|
|
{
|
|
if ((opts->mask & required_opts) != required_opts) {
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
|
|
if ((opt_tokens[i].token & required_opts) &&
|
|
!(opt_tokens[i].token & opts->mask)) {
|
|
pr_warn("missing parameter '%s'\n",
|
|
opt_tokens[i].pattern);
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool nvmf_ip_options_match(struct nvme_ctrl *ctrl,
|
|
struct nvmf_ctrl_options *opts)
|
|
{
|
|
if (!nvmf_ctlr_matches_baseopts(ctrl, opts) ||
|
|
strcmp(opts->traddr, ctrl->opts->traddr) ||
|
|
strcmp(opts->trsvcid, ctrl->opts->trsvcid))
|
|
return false;
|
|
|
|
/*
|
|
* Checking the local address is rough. In most cases, none is specified
|
|
* and the host port is selected by the stack.
|
|
*
|
|
* Assume no match if:
|
|
* - local address is specified and address is not the same
|
|
* - local address is not specified but remote is, or vice versa
|
|
* (admin using specific host_traddr when it matters).
|
|
*/
|
|
if ((opts->mask & NVMF_OPT_HOST_TRADDR) &&
|
|
(ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
|
|
if (strcmp(opts->host_traddr, ctrl->opts->host_traddr))
|
|
return false;
|
|
} else if ((opts->mask & NVMF_OPT_HOST_TRADDR) ||
|
|
(ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmf_ip_options_match);
|
|
|
|
static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts,
|
|
unsigned int allowed_opts)
|
|
{
|
|
if (opts->mask & ~allowed_opts) {
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
|
|
if ((opt_tokens[i].token & opts->mask) &&
|
|
(opt_tokens[i].token & ~allowed_opts)) {
|
|
pr_warn("invalid parameter '%s'\n",
|
|
opt_tokens[i].pattern);
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nvmf_free_options(struct nvmf_ctrl_options *opts)
|
|
{
|
|
nvmf_host_put(opts->host);
|
|
kfree(opts->transport);
|
|
kfree(opts->traddr);
|
|
kfree(opts->trsvcid);
|
|
kfree(opts->subsysnqn);
|
|
kfree(opts->host_traddr);
|
|
kfree(opts->host_iface);
|
|
kfree(opts);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nvmf_free_options);
|
|
|
|
#define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
|
|
#define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
|
|
NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
|
|
NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT |\
|
|
NVMF_OPT_DISABLE_SQFLOW | NVMF_OPT_DISCOVERY |\
|
|
NVMF_OPT_FAIL_FAST_TMO)
|
|
|
|
static struct nvme_ctrl *
|
|
nvmf_create_ctrl(struct device *dev, const char *buf)
|
|
{
|
|
struct nvmf_ctrl_options *opts;
|
|
struct nvmf_transport_ops *ops;
|
|
struct nvme_ctrl *ctrl;
|
|
int ret;
|
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
|
|
if (!opts)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = nvmf_parse_options(opts, buf);
|
|
if (ret)
|
|
goto out_free_opts;
|
|
|
|
|
|
request_module("nvme-%s", opts->transport);
|
|
|
|
/*
|
|
* Check the generic options first as we need a valid transport for
|
|
* the lookup below. Then clear the generic flags so that transport
|
|
* drivers don't have to care about them.
|
|
*/
|
|
ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS);
|
|
if (ret)
|
|
goto out_free_opts;
|
|
opts->mask &= ~NVMF_REQUIRED_OPTS;
|
|
|
|
down_read(&nvmf_transports_rwsem);
|
|
ops = nvmf_lookup_transport(opts);
|
|
if (!ops) {
|
|
pr_info("no handler found for transport %s.\n",
|
|
opts->transport);
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (!try_module_get(ops->module)) {
|
|
ret = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
up_read(&nvmf_transports_rwsem);
|
|
|
|
ret = nvmf_check_required_opts(opts, ops->required_opts);
|
|
if (ret)
|
|
goto out_module_put;
|
|
ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS |
|
|
ops->allowed_opts | ops->required_opts);
|
|
if (ret)
|
|
goto out_module_put;
|
|
|
|
ctrl = ops->create_ctrl(dev, opts);
|
|
if (IS_ERR(ctrl)) {
|
|
ret = PTR_ERR(ctrl);
|
|
goto out_module_put;
|
|
}
|
|
|
|
module_put(ops->module);
|
|
return ctrl;
|
|
|
|
out_module_put:
|
|
module_put(ops->module);
|
|
goto out_free_opts;
|
|
out_unlock:
|
|
up_read(&nvmf_transports_rwsem);
|
|
out_free_opts:
|
|
nvmf_free_options(opts);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct class *nvmf_class;
|
|
static struct device *nvmf_device;
|
|
static DEFINE_MUTEX(nvmf_dev_mutex);
|
|
|
|
static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf,
|
|
size_t count, loff_t *pos)
|
|
{
|
|
struct seq_file *seq_file = file->private_data;
|
|
struct nvme_ctrl *ctrl;
|
|
const char *buf;
|
|
int ret = 0;
|
|
|
|
if (count > PAGE_SIZE)
|
|
return -ENOMEM;
|
|
|
|
buf = memdup_user_nul(ubuf, count);
|
|
if (IS_ERR(buf))
|
|
return PTR_ERR(buf);
|
|
|
|
mutex_lock(&nvmf_dev_mutex);
|
|
if (seq_file->private) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ctrl = nvmf_create_ctrl(nvmf_device, buf);
|
|
if (IS_ERR(ctrl)) {
|
|
ret = PTR_ERR(ctrl);
|
|
goto out_unlock;
|
|
}
|
|
|
|
seq_file->private = ctrl;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&nvmf_dev_mutex);
|
|
kfree(buf);
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static void __nvmf_concat_opt_tokens(struct seq_file *seq_file)
|
|
{
|
|
const struct match_token *tok;
|
|
int idx;
|
|
|
|
/*
|
|
* Add dummy entries for instance and cntlid to
|
|
* signal an invalid/non-existing controller
|
|
*/
|
|
seq_puts(seq_file, "instance=-1,cntlid=-1");
|
|
for (idx = 0; idx < ARRAY_SIZE(opt_tokens); idx++) {
|
|
tok = &opt_tokens[idx];
|
|
if (tok->token == NVMF_OPT_ERR)
|
|
continue;
|
|
seq_puts(seq_file, ",");
|
|
seq_puts(seq_file, tok->pattern);
|
|
}
|
|
seq_puts(seq_file, "\n");
|
|
}
|
|
|
|
static int nvmf_dev_show(struct seq_file *seq_file, void *private)
|
|
{
|
|
struct nvme_ctrl *ctrl;
|
|
|
|
mutex_lock(&nvmf_dev_mutex);
|
|
ctrl = seq_file->private;
|
|
if (!ctrl) {
|
|
__nvmf_concat_opt_tokens(seq_file);
|
|
goto out_unlock;
|
|
}
|
|
|
|
seq_printf(seq_file, "instance=%d,cntlid=%d\n",
|
|
ctrl->instance, ctrl->cntlid);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&nvmf_dev_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int nvmf_dev_open(struct inode *inode, struct file *file)
|
|
{
|
|
/*
|
|
* The miscdevice code initializes file->private_data, but doesn't
|
|
* make use of it later.
|
|
*/
|
|
file->private_data = NULL;
|
|
return single_open(file, nvmf_dev_show, NULL);
|
|
}
|
|
|
|
static int nvmf_dev_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq_file = file->private_data;
|
|
struct nvme_ctrl *ctrl = seq_file->private;
|
|
|
|
if (ctrl)
|
|
nvme_put_ctrl(ctrl);
|
|
return single_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations nvmf_dev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.write = nvmf_dev_write,
|
|
.read = seq_read,
|
|
.open = nvmf_dev_open,
|
|
.release = nvmf_dev_release,
|
|
};
|
|
|
|
static struct miscdevice nvmf_misc = {
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
.name = "nvme-fabrics",
|
|
.fops = &nvmf_dev_fops,
|
|
};
|
|
|
|
static int __init nvmf_init(void)
|
|
{
|
|
int ret;
|
|
|
|
nvmf_default_host = nvmf_host_default();
|
|
if (!nvmf_default_host)
|
|
return -ENOMEM;
|
|
|
|
nvmf_class = class_create(THIS_MODULE, "nvme-fabrics");
|
|
if (IS_ERR(nvmf_class)) {
|
|
pr_err("couldn't register class nvme-fabrics\n");
|
|
ret = PTR_ERR(nvmf_class);
|
|
goto out_free_host;
|
|
}
|
|
|
|
nvmf_device =
|
|
device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl");
|
|
if (IS_ERR(nvmf_device)) {
|
|
pr_err("couldn't create nvme-fabris device!\n");
|
|
ret = PTR_ERR(nvmf_device);
|
|
goto out_destroy_class;
|
|
}
|
|
|
|
ret = misc_register(&nvmf_misc);
|
|
if (ret) {
|
|
pr_err("couldn't register misc device: %d\n", ret);
|
|
goto out_destroy_device;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_destroy_device:
|
|
device_destroy(nvmf_class, MKDEV(0, 0));
|
|
out_destroy_class:
|
|
class_destroy(nvmf_class);
|
|
out_free_host:
|
|
nvmf_host_put(nvmf_default_host);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nvmf_exit(void)
|
|
{
|
|
misc_deregister(&nvmf_misc);
|
|
device_destroy(nvmf_class, MKDEV(0, 0));
|
|
class_destroy(nvmf_class);
|
|
nvmf_host_put(nvmf_default_host);
|
|
|
|
BUILD_BUG_ON(sizeof(struct nvmf_common_command) != 64);
|
|
BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64);
|
|
BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64);
|
|
BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64);
|
|
BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_init(nvmf_init);
|
|
module_exit(nvmf_exit);
|