[linux-2.6-block.git] / drivers / nvme / target / discovery.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Discovery service for the NVMe over Fabrics target.
 * Copyright (C) 2016 Intel Corporation. All rights reserved.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/slab.h>
#include <generated/utsrelease.h>
#include "nvmet.h"

struct nvmet_subsys *nvmet_disc_subsys;

static u64 nvmet_genctr;

static void __nvmet_disc_changed(struct nvmet_port *port,
				 struct nvmet_ctrl *ctrl)
{
	if (ctrl->port != port)
		return;

	if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_DISC_CHANGE))
		return;

	nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
			      NVME_AER_NOTICE_DISC_CHANGED, NVME_LOG_DISC);
}

void nvmet_port_disc_changed(struct nvmet_port *port,
			     struct nvmet_subsys *subsys)
{
	struct nvmet_ctrl *ctrl;

	lockdep_assert_held(&nvmet_config_sem);
	nvmet_genctr++;

	mutex_lock(&nvmet_disc_subsys->lock);
	list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) {
		if (subsys && !nvmet_host_allowed(subsys, ctrl->hostnqn))
			continue;

		__nvmet_disc_changed(port, ctrl);
	}
	mutex_unlock(&nvmet_disc_subsys->lock);

	/* If transport can signal change, notify transport */
	if (port->tr_ops && port->tr_ops->discovery_chg)
		port->tr_ops->discovery_chg(port);
}

static void __nvmet_subsys_disc_changed(struct nvmet_port *port,
					struct nvmet_subsys *subsys,
					struct nvmet_host *host)
{
	struct nvmet_ctrl *ctrl;

	mutex_lock(&nvmet_disc_subsys->lock);
	list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) {
		if (host && strcmp(nvmet_host_name(host), ctrl->hostnqn))
			continue;

		__nvmet_disc_changed(port, ctrl);
	}
	mutex_unlock(&nvmet_disc_subsys->lock);
}

void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
			       struct nvmet_host *host)
{
	struct nvmet_port *port;
	struct nvmet_subsys_link *s;

	nvmet_genctr++;

	list_for_each_entry(port, nvmet_ports, global_entry)
		list_for_each_entry(s, &port->subsystems, entry) {
			if (s->subsys != subsys)
				continue;
			__nvmet_subsys_disc_changed(port, subsys, host);
		}
}

void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port)
{
	down_write(&nvmet_config_sem);
	if (list_empty(&port->entry)) {
		list_add_tail(&port->entry, &parent->referrals);
		port->enabled = true;
		nvmet_port_disc_changed(parent, NULL);
	}
	up_write(&nvmet_config_sem);
}

void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port)
{
	down_write(&nvmet_config_sem);
	if (!list_empty(&port->entry)) {
		port->enabled = false;
		list_del_init(&port->entry);
		nvmet_port_disc_changed(parent, NULL);
	}
	up_write(&nvmet_config_sem);
}

static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
		struct nvmet_port *port, char *subsys_nqn, char *traddr,
		u8 type, u32 numrec)
{
	struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];

	e->trtype = port->disc_addr.trtype;
	e->adrfam = port->disc_addr.adrfam;
	e->treq = port->disc_addr.treq;
	e->portid = port->disc_addr.portid;
	/* we support only dynamic controllers */
	e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC);
	e->asqsz = cpu_to_le16(NVME_AQ_DEPTH);
	e->subtype = type;
	memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
	memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE);
	memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
	strncpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
}

/*
 * nvmet_set_disc_traddr - set a correct discovery log entry traddr
 *
 * IP based transports (e.g RDMA) can listen on "any" ipv4/ipv6 addresses
 * (INADDR_ANY or IN6ADDR_ANY_INIT). The discovery log page traddr reply
 * must not contain that "any" IP address. If the transport implements
 * .disc_traddr, use it. this callback will set the discovery traddr
 * from the req->port address in case the port in question listens
 * "any" IP address.
 */
static void nvmet_set_disc_traddr(struct nvmet_req *req, struct nvmet_port *port,
		char *traddr)
{
	if (req->ops->disc_traddr)
		req->ops->disc_traddr(req, port, traddr);
	else
		memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
}

static size_t discovery_log_entries(struct nvmet_req *req)
{
	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	struct nvmet_subsys_link *p;
	struct nvmet_port *r;
	size_t entries = 0;

	list_for_each_entry(p, &req->port->subsystems, entry) {
		if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
			continue;
		entries++;
	}
	list_for_each_entry(r, &req->port->referrals, entry)
		entries++;
	return entries;
}

static void nvmet_execute_disc_get_log_page(struct nvmet_req *req)
{
	const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	struct nvmf_disc_rsp_page_hdr *hdr;
	u64 offset = nvmet_get_log_page_offset(req->cmd);
	size_t data_len = nvmet_get_log_page_len(req->cmd);
	size_t alloc_len;
	struct nvmet_subsys_link *p;
	struct nvmet_port *r;
	u32 numrec = 0;
	u16 status = 0;
	void *buffer;

	if (req->cmd->get_log_page.lid != NVME_LOG_DISC) {
		req->error_loc =
			offsetof(struct nvme_get_log_page_command, lid);
		status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
		goto out;
	}

	/* Spec requires dword aligned offsets */
	if (offset & 0x3) {
		status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
		goto out;
	}

	/*
	 * Make sure we're passing at least a buffer of response header size.
	 * If host provided data len is less than the header size, only the
	 * number of bytes requested by host will be sent to host.
	 */
	down_read(&nvmet_config_sem);
	alloc_len = sizeof(*hdr) + entry_size * discovery_log_entries(req);
	buffer = kzalloc(alloc_len, GFP_KERNEL);
	if (!buffer) {
		up_read(&nvmet_config_sem);
		status = NVME_SC_INTERNAL;
		goto out;
	}

	hdr = buffer;
	list_for_each_entry(p, &req->port->subsystems, entry) {
		char traddr[NVMF_TRADDR_SIZE];

		if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
			continue;

		nvmet_set_disc_traddr(req, req->port, traddr);
		nvmet_format_discovery_entry(hdr, req->port,
				p->subsys->subsysnqn, traddr,
				NVME_NQN_NVME, numrec);
		numrec++;
	}

	list_for_each_entry(r, &req->port->referrals, entry) {
		nvmet_format_discovery_entry(hdr, r,
				NVME_DISC_SUBSYS_NAME,
				r->disc_addr.traddr,
				NVME_NQN_DISC, numrec);
		numrec++;
	}

	hdr->genctr = cpu_to_le64(nvmet_genctr);
	hdr->numrec = cpu_to_le64(numrec);
	hdr->recfmt = cpu_to_le16(0);

	nvmet_clear_aen_bit(req, NVME_AEN_BIT_DISC_CHANGE);

	up_read(&nvmet_config_sem);

	status = nvmet_copy_to_sgl(req, 0, buffer + offset, data_len);
	kfree(buffer);
out:
	nvmet_req_complete(req, status);
}

static void nvmet_execute_disc_identify(struct nvmet_req *req)
{
	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	struct nvme_id_ctrl *id;
	u16 status = 0;

	if (req->cmd->identify.cns != NVME_ID_CNS_CTRL) {
		req->error_loc = offsetof(struct nvme_identify, cns);
		status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
		goto out;
	}

	id = kzalloc(sizeof(*id), GFP_KERNEL);
	if (!id) {
		status = NVME_SC_INTERNAL;
		goto out;
	}

	memset(id->fr, ' ', sizeof(id->fr));
	strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));

	/* 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);
	id->lpa = (1 << 2);

	/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
	id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);

	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 (req->port->inline_data_size)
		id->sgls |= cpu_to_le32(1 << 20);

	id->oaes = cpu_to_le32(NVMET_DISC_AEN_CFG_OPTIONAL);

	strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));

	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));

	kfree(id);
out:
	nvmet_req_complete(req, status);
}

static void nvmet_execute_disc_set_features(struct nvmet_req *req)
{
	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
	u16 stat;

	switch (cdw10 & 0xff) {
	case NVME_FEAT_KATO:
		stat = nvmet_set_feat_kato(req);
		break;
	case NVME_FEAT_ASYNC_EVENT:
		stat = nvmet_set_feat_async_event(req,
						  NVMET_DISC_AEN_CFG_OPTIONAL);
		break;
	default:
		req->error_loc =
			offsetof(struct nvme_common_command, cdw10);
		stat = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
		break;
	}

	nvmet_req_complete(req, stat);
}

static void nvmet_execute_disc_get_features(struct nvmet_req *req)
{
	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
	u16 stat = 0;

	switch (cdw10 & 0xff) {
	case NVME_FEAT_KATO:
		nvmet_get_feat_kato(req);
		break;
	case NVME_FEAT_ASYNC_EVENT:
		nvmet_get_feat_async_event(req);
		break;
	default:
		req->error_loc =
			offsetof(struct nvme_common_command, cdw10);
		stat = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
		break;
	}

	nvmet_req_complete(req, stat);
}

u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
{
	struct nvme_command *cmd = req->cmd;

	if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
		pr_err("got cmd %d while not ready\n",
		       cmd->common.opcode);
		req->error_loc =
			offsetof(struct nvme_common_command, opcode);
		return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
	}

	switch (cmd->common.opcode) {
	case nvme_admin_set_features:
		req->execute = nvmet_execute_disc_set_features;
		req->data_len = 0;
		return 0;
	case nvme_admin_get_features:
		req->execute = nvmet_execute_disc_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;
	case nvme_admin_get_log_page:
		req->data_len = nvmet_get_log_page_len(cmd);
		req->execute = nvmet_execute_disc_get_log_page;
		return 0;
	case nvme_admin_identify:
		req->data_len = NVME_IDENTIFY_DATA_SIZE;
		req->execute = nvmet_execute_disc_identify;
		return 0;
	default:
		pr_err("unhandled cmd %d\n", cmd->common.opcode);
		req->error_loc = offsetof(struct nvme_common_command, opcode);
		return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
	}

}

int __init nvmet_init_discovery(void)
{
	nvmet_disc_subsys =
		nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
	return PTR_ERR_OR_ZERO(nvmet_disc_subsys);
}

void nvmet_exit_discovery(void)
{
	nvmet_subsys_put(nvmet_disc_subsys);
}
Commit	Line	Data
77141dc6	1	// SPDX-License-Identifier: GPL-2.0
a07b4970 CH	2	/*
	3	* Discovery service for the NVMe over Fabrics target.
	4	* Copyright (C) 2016 Intel Corporation. All rights reserved.
a07b4970 CH	5	*/
	6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	7	#include <linux/slab.h>
	8	#include <generated/utsrelease.h>
	9	#include "nvmet.h"
	10
	11	struct nvmet_subsys *nvmet_disc_subsys;
	12
03198c4d	13	static u64 nvmet_genctr;
a07b4970	14
b662a078 JS	15	static void __nvmet_disc_changed(struct nvmet_port *port,
	16	struct nvmet_ctrl *ctrl)
	17	{
	18	if (ctrl->port != port)
	19	return;
	20
	21	if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_DISC_CHANGE))
	22	return;
	23
	24	nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE,
	25	NVME_AER_NOTICE_DISC_CHANGED, NVME_LOG_DISC);
	26	}
	27
	28	void nvmet_port_disc_changed(struct nvmet_port *port,
	29	struct nvmet_subsys *subsys)
	30	{
	31	struct nvmet_ctrl *ctrl;
	32
6f53e73b	33	lockdep_assert_held(&nvmet_config_sem);
b662a078 JS	34	nvmet_genctr++;
b662a078 JS	35
6f53e73b	36	mutex_lock(&nvmet_disc_subsys->lock);
b662a078 JS	37	list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) {
	38	if (subsys && !nvmet_host_allowed(subsys, ctrl->hostnqn))
	39	continue;
	40
	41	__nvmet_disc_changed(port, ctrl);
	42	}
6f53e73b	43	mutex_unlock(&nvmet_disc_subsys->lock);
9d09dd8d JS	44
	45	/* If transport can signal change, notify transport */
	46	if (port->tr_ops && port->tr_ops->discovery_chg)
	47	port->tr_ops->discovery_chg(port);
b662a078 JS	48	}
	49
	50	static void __nvmet_subsys_disc_changed(struct nvmet_port *port,
	51	struct nvmet_subsys *subsys,
	52	struct nvmet_host *host)
	53	{
	54	struct nvmet_ctrl *ctrl;
	55
6f53e73b	56	mutex_lock(&nvmet_disc_subsys->lock);
b662a078 JS	57	list_for_each_entry(ctrl, &nvmet_disc_subsys->ctrls, subsys_entry) {
	58	if (host && strcmp(nvmet_host_name(host), ctrl->hostnqn))
	59	continue;
	60
	61	__nvmet_disc_changed(port, ctrl);
	62	}
6f53e73b	63	mutex_unlock(&nvmet_disc_subsys->lock);
b662a078 JS	64	}
	65
	66	void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
	67	struct nvmet_host *host)
	68	{
	69	struct nvmet_port *port;
	70	struct nvmet_subsys_link *s;
	71
	72	nvmet_genctr++;
	73
	74	list_for_each_entry(port, nvmet_ports, global_entry)
	75	list_for_each_entry(s, &port->subsystems, entry) {
	76	if (s->subsys != subsys)
	77	continue;
	78	__nvmet_subsys_disc_changed(port, subsys, host);
	79	}
	80	}
	81
a07b4970 CH	82	void nvmet_referral_enable(struct nvmet_port parent, struct nvmet_port port)
	83	{
	84	down_write(&nvmet_config_sem);
	85	if (list_empty(&port->entry)) {
	86	list_add_tail(&port->entry, &parent->referrals);
	87	port->enabled = true;
b662a078	88	nvmet_port_disc_changed(parent, NULL);
a07b4970 CH	89	}
	90	up_write(&nvmet_config_sem);
	91	}
	92
b662a078	93	void nvmet_referral_disable(struct nvmet_port parent, struct nvmet_port port)
a07b4970 CH	94	{
	95	down_write(&nvmet_config_sem);
	96	if (!list_empty(&port->entry)) {
	97	port->enabled = false;
	98	list_del_init(&port->entry);
b662a078	99	nvmet_port_disc_changed(parent, NULL);
a07b4970 CH	100	}
	101	up_write(&nvmet_config_sem);
	102	}
	103
	104	static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
4c652685 SG	105	struct nvmet_port port, char subsys_nqn, char *traddr,
4c652685 SG	106	u8 type, u32 numrec)
a07b4970 CH	107	{
	108	struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];
	109
	110	e->trtype = port->disc_addr.trtype;
	111	e->adrfam = port->disc_addr.adrfam;
	112	e->treq = port->disc_addr.treq;
	113	e->portid = port->disc_addr.portid;
	114	/* we support only dynamic controllers */
	115	e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC);
7aa1f427	116	e->asqsz = cpu_to_le16(NVME_AQ_DEPTH);
a446c084	117	e->subtype = type;
a07b4970	118	memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
4c652685	119	memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE);
a07b4970	120	memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
6038aa53	121	strncpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
a07b4970 CH	122	}
a07b4970 CH	123
4c652685 SG	124	/*
	125	* nvmet_set_disc_traddr - set a correct discovery log entry traddr
	126	*
	127	* IP based transports (e.g RDMA) can listen on "any" ipv4/ipv6 addresses
	128	* (INADDR_ANY or IN6ADDR_ANY_INIT). The discovery log page traddr reply
	129	* must not contain that "any" IP address. If the transport implements
	130	* .disc_traddr, use it. this callback will set the discovery traddr
	131	* from the req->port address in case the port in question listens
	132	* "any" IP address.
	133	*/
	134	static void nvmet_set_disc_traddr(struct nvmet_req req, struct nvmet_port port,
	135	char *traddr)
	136	{
	137	if (req->ops->disc_traddr)
	138	req->ops->disc_traddr(req, port, traddr);
	139	else
	140	memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
	141	}
	142
d808b7f7 KB	143	static size_t discovery_log_entries(struct nvmet_req *req)
	144	{
	145	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	146	struct nvmet_subsys_link *p;
	147	struct nvmet_port *r;
	148	size_t entries = 0;
	149
	150	list_for_each_entry(p, &req->port->subsystems, entry) {
	151	if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
	152	continue;
	153	entries++;
	154	}
	155	list_for_each_entry(r, &req->port->referrals, entry)
	156	entries++;
	157	return entries;
	158	}
	159
6f86f2c9	160	static void nvmet_execute_disc_get_log_page(struct nvmet_req *req)
a07b4970 CH	161	{
	162	const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
	163	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	164	struct nvmf_disc_rsp_page_hdr *hdr;
d808b7f7	165	u64 offset = nvmet_get_log_page_offset(req->cmd);
a07b4970	166	size_t data_len = nvmet_get_log_page_len(req->cmd);
d808b7f7	167	size_t alloc_len;
a07b4970 CH	168	struct nvmet_subsys_link *p;
	169	struct nvmet_port *r;
	170	u32 numrec = 0;
	171	u16 status = 0;
d808b7f7 KB	172	void *buffer;
d808b7f7 KB	173
6f86f2c9 CH	174	if (req->cmd->get_log_page.lid != NVME_LOG_DISC) {
	175	req->error_loc =
	176	offsetof(struct nvme_get_log_page_command, lid);
	177	status = NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;
	178	goto out;
	179	}
	180
d808b7f7 KB	181	/* Spec requires dword aligned offsets */
	182	if (offset & 0x3) {
	183	status = NVME_SC_INVALID_FIELD \| NVME_SC_DNR;
	184	goto out;
	185	}
a07b4970 CH	186
	187	/*
	188	* Make sure we're passing at least a buffer of response header size.
	189	* If host provided data len is less than the header size, only the
	190	* number of bytes requested by host will be sent to host.
	191	*/
d808b7f7 KB	192	down_read(&nvmet_config_sem);
	193	alloc_len = sizeof(hdr) + entry_size discovery_log_entries(req);
	194	buffer = kzalloc(alloc_len, GFP_KERNEL);
	195	if (!buffer) {
	196	up_read(&nvmet_config_sem);
a07b4970 CH	197	status = NVME_SC_INTERNAL;
	198	goto out;
	199	}
	200
d808b7f7	201	hdr = buffer;
a07b4970	202	list_for_each_entry(p, &req->port->subsystems, entry) {
d808b7f7 KB	203	char traddr[NVMF_TRADDR_SIZE];
d808b7f7 KB	204
253928ee	205	if (!nvmet_host_allowed(p->subsys, ctrl->hostnqn))
a07b4970	206	continue;
d808b7f7 KB	207
	208	nvmet_set_disc_traddr(req, req->port, traddr);
	209	nvmet_format_discovery_entry(hdr, req->port,
	210	p->subsys->subsysnqn, traddr,
	211	NVME_NQN_NVME, numrec);
a07b4970 CH	212	numrec++;
	213	}
	214
	215	list_for_each_entry(r, &req->port->referrals, entry) {
d808b7f7 KB	216	nvmet_format_discovery_entry(hdr, r,
	217	NVME_DISC_SUBSYS_NAME,
	218	r->disc_addr.traddr,
	219	NVME_NQN_DISC, numrec);
a07b4970 CH	220	numrec++;
	221	}
	222
	223	hdr->genctr = cpu_to_le64(nvmet_genctr);
	224	hdr->numrec = cpu_to_le64(numrec);
	225	hdr->recfmt = cpu_to_le16(0);
	226
b662a078 JS	227	nvmet_clear_aen_bit(req, NVME_AEN_BIT_DISC_CHANGE);
b662a078 JS	228
a07b4970 CH	229	up_read(&nvmet_config_sem);
a07b4970 CH	230
d808b7f7 KB	231	status = nvmet_copy_to_sgl(req, 0, buffer + offset, data_len);
d808b7f7 KB	232	kfree(buffer);
a07b4970 CH	233	out:
	234	nvmet_req_complete(req, status);
	235	}
	236
6f86f2c9	237	static void nvmet_execute_disc_identify(struct nvmet_req *req)
a07b4970 CH	238	{
	239	struct nvmet_ctrl *ctrl = req->sq->ctrl;
	240	struct nvme_id_ctrl *id;
	241	u16 status = 0;
	242
6f86f2c9 CH	243	if (req->cmd->identify.cns != NVME_ID_CNS_CTRL) {
	244	req->error_loc = offsetof(struct nvme_identify, cns);
	245	status = NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;
	246	goto out;
	247	}
	248
a07b4970 CH	249	id = kzalloc(sizeof(*id), GFP_KERNEL);
	250	if (!id) {
	251	status = NVME_SC_INTERNAL;
	252	goto out;
	253	}
	254
	255	memset(id->fr, ' ', sizeof(id->fr));
	256	strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));
	257
	258	/* no limit on data transfer sizes for now */
	259	id->mdts = 0;
	260	id->cntlid = cpu_to_le16(ctrl->cntlid);
	261	id->ver = cpu_to_le32(ctrl->subsys->ver);
	262	id->lpa = (1 << 2);
	263
	264	/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
	265	id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
	266
	267	id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
	268	if (ctrl->ops->has_keyed_sgls)
	269	id->sgls \|= cpu_to_le32(1 << 2);
0d5ee2b2	270	if (req->port->inline_data_size)
a07b4970 CH	271	id->sgls \|= cpu_to_le32(1 << 20);
a07b4970 CH	272
b662a078 JS	273	id->oaes = cpu_to_le32(NVMET_DISC_AEN_CFG_OPTIONAL);
b662a078 JS	274
5eadc9cc	275	strlcpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
a07b4970 CH	276
	277	status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
	278
	279	kfree(id);
	280	out:
	281	nvmet_req_complete(req, status);
	282	}
	283
6a8ec0ac JS	284	static void nvmet_execute_disc_set_features(struct nvmet_req *req)
6a8ec0ac JS	285	{
b7c8f366	286	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
6a8ec0ac JS	287	u16 stat;
	288
	289	switch (cdw10 & 0xff) {
	290	case NVME_FEAT_KATO:
	291	stat = nvmet_set_feat_kato(req);
	292	break;
	293	case NVME_FEAT_ASYNC_EVENT:
	294	stat = nvmet_set_feat_async_event(req,
	295	NVMET_DISC_AEN_CFG_OPTIONAL);
	296	break;
	297	default:
84faf42b CK	298	req->error_loc =
84faf42b CK	299	offsetof(struct nvme_common_command, cdw10);
6a8ec0ac JS	300	stat = NVME_SC_INVALID_FIELD \| NVME_SC_DNR;
	301	break;
	302	}
	303
	304	nvmet_req_complete(req, stat);
	305	}
	306
	307	static void nvmet_execute_disc_get_features(struct nvmet_req *req)
	308	{
b7c8f366	309	u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
6a8ec0ac JS	310	u16 stat = 0;
	311
	312	switch (cdw10 & 0xff) {
	313	case NVME_FEAT_KATO:
	314	nvmet_get_feat_kato(req);
	315	break;
	316	case NVME_FEAT_ASYNC_EVENT:
	317	nvmet_get_feat_async_event(req);
	318	break;
	319	default:
84faf42b CK	320	req->error_loc =
84faf42b CK	321	offsetof(struct nvme_common_command, cdw10);
6a8ec0ac JS	322	stat = NVME_SC_INVALID_FIELD \| NVME_SC_DNR;
	323	break;
	324	}
	325
	326	nvmet_req_complete(req, stat);
	327	}
	328
64a0ca88	329	u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
a07b4970 CH	330	{
	331	struct nvme_command *cmd = req->cmd;
	332
a07b4970	333	if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
4151dd9a PP	334	pr_err("got cmd %d while not ready\n",
4151dd9a PP	335	cmd->common.opcode);
84faf42b CK	336	req->error_loc =
84faf42b CK	337	offsetof(struct nvme_common_command, opcode);
a07b4970 CH	338	return NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;
	339	}
	340
	341	switch (cmd->common.opcode) {
6a8ec0ac JS	342	case nvme_admin_set_features:
	343	req->execute = nvmet_execute_disc_set_features;
	344	req->data_len = 0;
	345	return 0;
	346	case nvme_admin_get_features:
	347	req->execute = nvmet_execute_disc_get_features;
	348	req->data_len = 0;
	349	return 0;
	350	case nvme_admin_async_event:
	351	req->execute = nvmet_execute_async_event;
	352	req->data_len = 0;
	353	return 0;
f9362ac1 JS	354	case nvme_admin_keep_alive:
	355	req->execute = nvmet_execute_keep_alive;
	356	req->data_len = 0;
	357	return 0;
a07b4970 CH	358	case nvme_admin_get_log_page:
a07b4970 CH	359	req->data_len = nvmet_get_log_page_len(cmd);
6f86f2c9 CH	360	req->execute = nvmet_execute_disc_get_log_page;
6f86f2c9 CH	361	return 0;
a07b4970	362	case nvme_admin_identify:
0add5e8e	363	req->data_len = NVME_IDENTIFY_DATA_SIZE;
6f86f2c9 CH	364	req->execute = nvmet_execute_disc_identify;
6f86f2c9 CH	365	return 0;
a07b4970	366	default:
48440ab6	367	pr_err("unhandled cmd %d\n", cmd->common.opcode);
84faf42b	368	req->error_loc = offsetof(struct nvme_common_command, opcode);
a07b4970 CH	369	return NVME_SC_INVALID_OPCODE \| NVME_SC_DNR;
	370	}
	371
a07b4970 CH	372	}
	373
	374	int __init nvmet_init_discovery(void)
	375	{
	376	nvmet_disc_subsys =
	377	nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
1179d337	378	return PTR_ERR_OR_ZERO(nvmet_disc_subsys);
a07b4970 CH	379	}
	380
	381	void nvmet_exit_discovery(void)
	382	{
	383	nvmet_subsys_put(nvmet_disc_subsys);
	384	}