278ab3799a
In the ADMIN_ONLY state we don't have any I/O queues, but we should accept all admin commands without further checks. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: James Smart <james.smart@broadcom.com>
179 lines
6.5 KiB
C
179 lines
6.5 KiB
C
/*
|
|
* NVMe over Fabrics common host code.
|
|
* 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.
|
|
*/
|
|
#ifndef _NVME_FABRICS_H
|
|
#define _NVME_FABRICS_H 1
|
|
|
|
#include <linux/in.h>
|
|
#include <linux/inet.h>
|
|
|
|
#define NVMF_MIN_QUEUE_SIZE 16
|
|
#define NVMF_MAX_QUEUE_SIZE 1024
|
|
#define NVMF_DEF_QUEUE_SIZE 128
|
|
#define NVMF_DEF_RECONNECT_DELAY 10
|
|
/* default to 600 seconds of reconnect attempts before giving up */
|
|
#define NVMF_DEF_CTRL_LOSS_TMO 600
|
|
|
|
/*
|
|
* Define a host as seen by the target. We allocate one at boot, but also
|
|
* allow the override it when creating controllers. This is both to provide
|
|
* persistence of the Host NQN over multiple boots, and to allow using
|
|
* multiple ones, for example in a container scenario. Because we must not
|
|
* use different Host NQNs with the same Host ID we generate a Host ID and
|
|
* use this structure to keep track of the relation between the two.
|
|
*/
|
|
struct nvmf_host {
|
|
struct kref ref;
|
|
struct list_head list;
|
|
char nqn[NVMF_NQN_SIZE];
|
|
uuid_t id;
|
|
};
|
|
|
|
/**
|
|
* enum nvmf_parsing_opts - used to define the sysfs parsing options used.
|
|
*/
|
|
enum {
|
|
NVMF_OPT_ERR = 0,
|
|
NVMF_OPT_TRANSPORT = 1 << 0,
|
|
NVMF_OPT_NQN = 1 << 1,
|
|
NVMF_OPT_TRADDR = 1 << 2,
|
|
NVMF_OPT_TRSVCID = 1 << 3,
|
|
NVMF_OPT_QUEUE_SIZE = 1 << 4,
|
|
NVMF_OPT_NR_IO_QUEUES = 1 << 5,
|
|
NVMF_OPT_TL_RETRY_COUNT = 1 << 6,
|
|
NVMF_OPT_KATO = 1 << 7,
|
|
NVMF_OPT_HOSTNQN = 1 << 8,
|
|
NVMF_OPT_RECONNECT_DELAY = 1 << 9,
|
|
NVMF_OPT_HOST_TRADDR = 1 << 10,
|
|
NVMF_OPT_CTRL_LOSS_TMO = 1 << 11,
|
|
NVMF_OPT_HOST_ID = 1 << 12,
|
|
NVMF_OPT_DUP_CONNECT = 1 << 13,
|
|
};
|
|
|
|
/**
|
|
* struct nvmf_ctrl_options - Used to hold the options specified
|
|
* with the parsing opts enum.
|
|
* @mask: Used by the fabrics library to parse through sysfs options
|
|
* on adding a NVMe controller.
|
|
* @transport: Holds the fabric transport "technology name" (for a lack of
|
|
* better description) that will be used by an NVMe controller
|
|
* being added.
|
|
* @subsysnqn: Hold the fully qualified NQN subystem name (format defined
|
|
* in the NVMe specification, "NVMe Qualified Names").
|
|
* @traddr: The transport-specific TRADDR field for a port on the
|
|
* subsystem which is adding a controller.
|
|
* @trsvcid: The transport-specific TRSVCID field for a port on the
|
|
* subsystem which is adding a controller.
|
|
* @host_traddr: A transport-specific field identifying the NVME host port
|
|
* to use for the connection to the controller.
|
|
* @queue_size: Number of IO queue elements.
|
|
* @nr_io_queues: Number of controller IO queues that will be established.
|
|
* @reconnect_delay: Time between two consecutive reconnect attempts.
|
|
* @discovery_nqn: indicates if the subsysnqn is the well-known discovery NQN.
|
|
* @kato: Keep-alive timeout.
|
|
* @host: Virtual NVMe host, contains the NQN and Host ID.
|
|
* @max_reconnects: maximum number of allowed reconnect attempts before removing
|
|
* the controller, (-1) means reconnect forever, zero means remove
|
|
* immediately;
|
|
*/
|
|
struct nvmf_ctrl_options {
|
|
unsigned mask;
|
|
char *transport;
|
|
char *subsysnqn;
|
|
char *traddr;
|
|
char *trsvcid;
|
|
char *host_traddr;
|
|
size_t queue_size;
|
|
unsigned int nr_io_queues;
|
|
unsigned int reconnect_delay;
|
|
bool discovery_nqn;
|
|
bool duplicate_connect;
|
|
unsigned int kato;
|
|
struct nvmf_host *host;
|
|
int max_reconnects;
|
|
};
|
|
|
|
/*
|
|
* struct nvmf_transport_ops - used to register a specific
|
|
* fabric implementation of NVMe fabrics.
|
|
* @entry: Used by the fabrics library to add the new
|
|
* registration entry to its linked-list internal tree.
|
|
* @module: Transport module reference
|
|
* @name: Name of the NVMe fabric driver implementation.
|
|
* @required_opts: sysfs command-line options that must be specified
|
|
* when adding a new NVMe controller.
|
|
* @allowed_opts: sysfs command-line options that can be specified
|
|
* when adding a new NVMe controller.
|
|
* @create_ctrl(): function pointer that points to a non-NVMe
|
|
* implementation-specific fabric technology
|
|
* that would go into starting up that fabric
|
|
* for the purpose of conneciton to an NVMe controller
|
|
* using that fabric technology.
|
|
*
|
|
* Notes:
|
|
* 1. At minimum, 'required_opts' and 'allowed_opts' should
|
|
* be set to the same enum parsing options defined earlier.
|
|
* 2. create_ctrl() must be defined (even if it does nothing)
|
|
* 3. struct nvmf_transport_ops must be statically allocated in the
|
|
* modules .bss section so that a pure module_get on @module
|
|
* prevents the memory from beeing freed.
|
|
*/
|
|
struct nvmf_transport_ops {
|
|
struct list_head entry;
|
|
struct module *module;
|
|
const char *name;
|
|
int required_opts;
|
|
int allowed_opts;
|
|
struct nvme_ctrl *(*create_ctrl)(struct device *dev,
|
|
struct nvmf_ctrl_options *opts);
|
|
};
|
|
|
|
static inline bool
|
|
nvmf_ctlr_matches_baseopts(struct nvme_ctrl *ctrl,
|
|
struct nvmf_ctrl_options *opts)
|
|
{
|
|
if (ctrl->state == NVME_CTRL_DELETING ||
|
|
ctrl->state == NVME_CTRL_DEAD ||
|
|
strcmp(opts->subsysnqn, ctrl->opts->subsysnqn) ||
|
|
strcmp(opts->host->nqn, ctrl->opts->host->nqn) ||
|
|
memcmp(&opts->host->id, &ctrl->opts->host->id, sizeof(uuid_t)))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val);
|
|
int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val);
|
|
int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val);
|
|
int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl);
|
|
int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid);
|
|
int nvmf_register_transport(struct nvmf_transport_ops *ops);
|
|
void nvmf_unregister_transport(struct nvmf_transport_ops *ops);
|
|
void nvmf_free_options(struct nvmf_ctrl_options *opts);
|
|
int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size);
|
|
bool nvmf_should_reconnect(struct nvme_ctrl *ctrl);
|
|
blk_status_t nvmf_fail_nonready_command(struct request *rq);
|
|
bool __nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
|
|
bool queue_live);
|
|
|
|
static inline bool nvmf_check_ready(struct nvme_ctrl *ctrl, struct request *rq,
|
|
bool queue_live)
|
|
{
|
|
if (likely(ctrl->state == NVME_CTRL_LIVE ||
|
|
ctrl->state == NVME_CTRL_ADMIN_ONLY))
|
|
return true;
|
|
return __nvmf_check_ready(ctrl, rq, queue_live);
|
|
}
|
|
|
|
#endif /* _NVME_FABRICS_H */
|