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diff --git a/src/nvme/mi.h b/src/nvme/mi.h new file mode 100644 index 0000000..81cb00f --- /dev/null +++ b/src/nvme/mi.h @@ -0,0 +1,1111 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * This file is part of libnvme. + * Copyright (c) 2021 Code Construct Pty Ltd + * + * Authors: Jeremy Kerr <jk@codeconstruct.com.au> + */ + +/** + * DOC: mi.h - NVMe Management Interface library (libnvme-mi) definitions. + * + * These provide an abstraction for the MI messaging between controllers + * and a host, typically over an MCTP-over-i2c link to a NVMe device, used + * as part of the out-of-band management of a system. + * + * We have a few data structures define here to reflect the topology + * of a MI connection with an NVMe subsystem: + * + * - &nvme_mi_ep_t: an MI endpoint - our mechanism of communication with a + * NVMe subsystem. For MCTP, an endpoint will be the component that + * holds the MCTP address (EID), and receives our request message. + * + * endpoints are defined in the NVMe-MI spec, and are specific to the MI + * interface. + * + * Each endpoint will provide access to one or more of: + * + * - &nvme_mi_ctrl_t: a NVMe controller, as defined by the NVMe base spec. + * The controllers are responsible for processing any NVMe standard + * commands (eg, the Admin command set). An endpoint (&nvme_mi_ep_t) + * may provide access to multiple controllers - so each of the controller- + * type commands will require a &nvme_mi_ctrl_t to be specified, rather than + * an endpoint + * + * A couple of conventions with the libnvme-mi API: + * + * - All types and functions have the nvme_mi prefix, to distinguish from + * the libnvme core. + * + * - We currently support either MI commands and Admin commands. The + * former adds a _mi prefix, the latter an _admin prefix. [This does + * result in the MI functions having a double _mi, like + * &nvme_mi_mi_subsystem_health_status_poll, which is apparently amusing + * for our German-speaking readers] + * + * For return values: unless specified in the per-function documentation, + * all functions: + * + * - return 0 on success + * + * - return -1, with errno set, for errors communicating with the MI device, + * either in request or response data + * + * - return >1 on MI status errors. This value is the 8-bit MI status + * value, represented by &enum nvme_mi_resp_status. Note that the + * status values may be vendor-defined above 0xe0. + * + * For the second case, we have a few conventions for errno values: + * + * - EPROTO: response data violated the MI protocol, and libnvme cannot + * validly interpret the response + * + * - EIO: Other I/O error communicating with device (eg., valid but + * unexpected response data) + * + * - EINVAL: invalid input arguments for a command + * + * In line with the core NVMe API, the Admin command functions take an + * `_args` structure to provide the command-specific parameters. However, + * for the MI interface, the fd and timeout members of these _args structs + * are ignored. + * + * References to the specifications here will either to be the NVM Express + * Management Interface ("NVMe-MI") or the NVM Express Base specification + * ("NVMe"). At the time of writing, the versions we're referencing here + * are: + * - NVMe-MI 1.2b + * - NVMe 2.0b + * with a couple of accommodations for older spec types, particularly NVMe-MI + * 1.1, where possible. + * + */ + +#ifndef _LIBNVME_MI_MI_H +#define _LIBNVME_MI_MI_H + +#include <endian.h> +#include <stdint.h> + +#include "types.h" +#include "tree.h" + +/** + * NVME_MI_MSGTYPE_NVME - MCTP message type for NVMe-MI messages. + * + * This is defined by MCTP, but is referenced as part of the NVMe-MI message + * spec. This is the MCTP NVMe message type (0x4), with the message-integrity + * bit (0x80) set. + */ +#define NVME_MI_MSGTYPE_NVME 0x84 + +/* Basic MI message definitions */ + +/** + * enum nvme_mi_message_type - NVMe-MI message type field. + * @NVME_MI_MT_CONTROL: NVME-MI Control Primitive + * @NVME_MI_MT_MI: NVMe-MI command + * @NVME_MI_MT_ADMIN: NVMe Admin command + * @NVME_MI_MT_PCIE: PCIe command + * + * Used as byte 1 of both request and response messages (NMIMT bits of NMP + * byte). Not to be confused with the MCTP message type in byte 0. + */ +enum nvme_mi_message_type { + NVME_MI_MT_CONTROL = 0, + NVME_MI_MT_MI = 1, + NVME_MI_MT_ADMIN = 2, + NVME_MI_MT_PCIE = 4, +}; + +/** + * enum nvme_mi_ror: Request or response field. + * @NVME_MI_ROR_REQ: request message + * @NVME_MI_ROR_RSP: response message + */ +enum nvme_mi_ror { + NVME_MI_ROR_REQ = 0, + NVME_MI_ROR_RSP = 1, +}; + +/** + * enum nvme_mi_resp_status - values for the response status field + * @NVME_MI_RESP_SUCCESS: success + * @NVME_MI_RESP_MPR: More Processing Required + * @NVME_MI_RESP_INTERNAL_ERR: Internal Error + * @NVME_MI_RESP_INVALID_OPCODE: Invalid command opcode + * @NVME_MI_RESP_INVALID_PARAM: Invalid command parameter + * @NVME_MI_RESP_INVALID_CMD_SIZE: Invalid command size + * @NVME_MI_RESP_INVALID_INPUT_SIZE: Invalid command input data size + * @NVME_MI_RESP_ACCESS_DENIED: Access Denied + * @NVME_MI_RESP_VPD_UPDATES_EXCEEDED: More VPD updates than allowed + * @NVME_MI_RESP_PCIE_INACCESSIBLE: PCIe functionality currently unavailable + * @NVME_MI_RESP_MEB_SANITIZED: MEB has been cleared due to sanitize + * @NVME_MI_RESP_ENC_SERV_FAILURE: Enclosure services process failed + * @NVME_MI_RESP_ENC_SERV_XFER_FAILURE: Transfer with enclosure services failed + * @NVME_MI_RESP_ENC_FAILURE: Unreoverable enclosure failure + * @NVME_MI_RESP_ENC_XFER_REFUSED: Enclosure services transfer refused + * @NVME_MI_RESP_ENC_FUNC_UNSUP: Unsupported enclosure services function + * @NVME_MI_RESP_ENC_SERV_UNAVAIL: Enclosure services unavailable + * @NVME_MI_RESP_ENC_DEGRADED: Noncritical failure detected by enc. services + * @NVME_MI_RESP_SANITIZE_IN_PROGRESS: Command prohibited during sanitize + */ +enum nvme_mi_resp_status { + NVME_MI_RESP_SUCCESS = 0x00, + NVME_MI_RESP_MPR = 0x01, + NVME_MI_RESP_INTERNAL_ERR = 0x02, + NVME_MI_RESP_INVALID_OPCODE = 0x03, + NVME_MI_RESP_INVALID_PARAM = 0x04, + NVME_MI_RESP_INVALID_CMD_SIZE = 0x05, + NVME_MI_RESP_INVALID_INPUT_SIZE = 0x06, + NVME_MI_RESP_ACCESS_DENIED = 0x07, + /* 0x08 - 0x1f: reserved */ + NVME_MI_RESP_VPD_UPDATES_EXCEEDED = 0x20, + NVME_MI_RESP_PCIE_INACCESSIBLE = 0x21, + NVME_MI_RESP_MEB_SANITIZED = 0x22, + NVME_MI_RESP_ENC_SERV_FAILURE = 0x23, + NVME_MI_RESP_ENC_SERV_XFER_FAILURE = 0x24, + NVME_MI_RESP_ENC_FAILURE = 0x25, + NVME_MI_RESP_ENC_XFER_REFUSED = 0x26, + NVME_MI_RESP_ENC_FUNC_UNSUP = 0x27, + NVME_MI_RESP_ENC_SERV_UNAVAIL = 0x28, + NVME_MI_RESP_ENC_DEGRADED = 0x29, + NVME_MI_RESP_SANITIZE_IN_PROGRESS = 0x2a, + /* 0x2b - 0xdf: reserved */ + /* 0xe0 - 0xff: vendor specific */ +}; + +/** + * struct nvme_mi_msg_hdr - General MI message header. + * @type: MCTP message type, will always be NVME_MI_MSGTYPE_NVME + * @nmp: NVMe-MI message parameters (including MI message type) + * @meb: Management Endpoint Buffer flag; unused for libnvme-mi implementation + * @rsvd0: currently reserved + * + * Wire format shared by both request and response messages, per NVMe-MI + * section 3.1. This is used for all message types, MI and Admin. + */ +struct nvme_mi_msg_hdr { + __u8 type; + __u8 nmp; + __u8 meb; + __u8 rsvd0; +} __attribute__((packed)); + +/** + * struct nvme_mi_msg_resp - Generic response type. + * @hdr: the general request/response message header + * @status: response status value (see &enum nvme_mi_resp_status) + * @rsvd0: reserved data, may be defined by specific response + * + * Every response will start with one of these; command-specific responses + * will define parts of the reserved data, and may add further fields. + */ +struct nvme_mi_msg_resp { + struct nvme_mi_msg_hdr hdr; + __u8 status; + __u8 rsvd0[3]; +}; + +/** + * enum nvme_mi_mi_opcode - Operation code for supported NVMe-MI commands. + * @nvme_mi_mi_opcode_mi_data_read: Read NVMe-MI Data Structure + * @nvme_mi_mi_opcode_subsys_health_status_poll: Subsystem Health Status Poll + * @nvme_mi_mi_opcode_configuration_set: MI Configuration Set + * @nvme_mi_mi_opcode_configuration_get: MI Configuration Get + */ +enum nvme_mi_mi_opcode { + nvme_mi_mi_opcode_mi_data_read = 0x00, + nvme_mi_mi_opcode_subsys_health_status_poll = 0x01, + nvme_mi_mi_opcode_configuration_set = 0x03, + nvme_mi_mi_opcode_configuration_get = 0x04, +}; + +/** + * struct nvme_mi_mi_req_hdr - MI request message header. + * @hdr: generic MI message header + * @opcode: opcode (OPC) for the specific MI command + * @rsvd0: reserved bytes + * @cdw0: Management Request Doubleword 0 - command specific usage + * @cdw1: Management Request Doubleword 1 - command specific usage + * + * Wire format for MI request message headers, defined in section 5 of NVMe-MI. + */ +struct nvme_mi_mi_req_hdr { + struct nvme_mi_msg_hdr hdr; + __u8 opcode; + __u8 rsvd0[3]; + __le32 cdw0, cdw1; +}; + +/** + * struct nvme_mi_mi_resp_hdr - MI response message header. + * @hdr: generic MI message header + * @status: generic response status from command; non-zero on failure. + * @nmresp: NVMe Management Response: command-type-specific response data + * + * Wire format for MI response message header, defined in section 5 of NVMe-MI. + */ +struct nvme_mi_mi_resp_hdr { + struct nvme_mi_msg_hdr hdr; + __u8 status; + __u8 nmresp[3]; +}; + +/** + * enum nvme_mi_dtyp - Data Structure Type field. + * @nvme_mi_dtyp_subsys_info: NVM Subsystem Information + * @nvme_mi_dtyp_port_info: Port information + * @nvme_mi_dtyp_ctrl_list: Controller List + * @nvme_mi_dtyp_ctrl_info: Controller Information + * @nvme_mi_dtyp_opt_cmd_support: Optionally Supported Command List + * @nvme_mi_dtyp_meb_support: Management Endpoint Buffer Command Support List + * + * Data Structure Type field for Read NVMe-MI Data Structure command, used to + * indicate the particular structure to query from the endpoint. + */ +enum nvme_mi_dtyp { + nvme_mi_dtyp_subsys_info = 0x00, + nvme_mi_dtyp_port_info = 0x01, + nvme_mi_dtyp_ctrl_list = 0x02, + nvme_mi_dtyp_ctrl_info = 0x03, + nvme_mi_dtyp_opt_cmd_support = 0x04, + nvme_mi_dtyp_meb_support = 0x05, +}; + +/** + * enum nvme_mi_config_id - NVMe-MI Configuration identifier. + * @NVME_MI_CONFIG_SMBUS_FREQ: Current SMBus/I2C frequency + * @NVME_MI_CONFIG_HEALTH_STATUS_CHANGE: Health Status change - used to clear + * health status bits in CCS bits of + * status poll. Only for Set ops. + * @NVME_MI_CONFIG_MCTP_MTU: MCTP maximum transmission unit size of port + * specified in dw 0 + * + * Configuration parameters for the MI Get/Set Configuration commands. + * + * See &nvme_mi_mi_config_get() and &nvme_mi_config_set(). + */ +enum nvme_mi_config_id { + NVME_MI_CONFIG_SMBUS_FREQ = 0x1, + NVME_MI_CONFIG_HEALTH_STATUS_CHANGE = 0x2, + NVME_MI_CONFIG_MCTP_MTU = 0x3, +}; + +/** + * enum nvme_mi_config_smbus_freq - SMBus/I2C frequency values + * @NVME_MI_CONFIG_SMBUS_FREQ_100kHz: 100kHz + * @NVME_MI_CONFIG_SMBUS_FREQ_400kHz: 400kHz + * @NVME_MI_CONFIG_SMBUS_FREQ_1MHz: 1MHz + * + * Values used in the SMBus Frequency device configuration. See + * &nvme_mi_mi_config_get_smbus_freq() and &nvme_mi_mi_config_set_smbus_freq(). + */ +enum nvme_mi_config_smbus_freq { + NVME_MI_CONFIG_SMBUS_FREQ_100kHz = 0x1, + NVME_MI_CONFIG_SMBUS_FREQ_400kHz = 0x2, + NVME_MI_CONFIG_SMBUS_FREQ_1MHz = 0x3, +}; + +/* Admin command definitions */ + +/** + * struct nvme_mi_admin_req_hdr - Admin command request header. + * @hdr: Generic MI message header + * @opcode: Admin command opcode (using enum nvme_admin_opcode) + * @flags: Command Flags, indicating dlen and doff validity; Only defined in + * NVMe-MI version 1.1, no fields defined in 1.2 (where the dlen/doff + * are always considered valid). + * @ctrl_id: Controller ID target of command + * @cdw1: Submission Queue Entry doubleword 1 + * @cdw2: Submission Queue Entry doubleword 2 + * @cdw3: Submission Queue Entry doubleword 3 + * @cdw4: Submission Queue Entry doubleword 4 + * @cdw5: Submission Queue Entry doubleword 5 + * @doff: Offset of data to return from command + * @dlen: Length of sent/returned data + * @rsvd0: Reserved + * @rsvd1: Reserved + * @cdw10: Submission Queue Entry doubleword 10 + * @cdw11: Submission Queue Entry doubleword 11 + * @cdw12: Submission Queue Entry doubleword 12 + * @cdw13: Submission Queue Entry doubleword 13 + * @cdw14: Submission Queue Entry doubleword 14 + * @cdw15: Submission Queue Entry doubleword 15 + * + * Wire format for Admin command message headers, defined in section 6 of + * NVMe-MI. + */ +struct nvme_mi_admin_req_hdr { + struct nvme_mi_msg_hdr hdr; + __u8 opcode; + __u8 flags; + __le16 ctrl_id; + __le32 cdw1, cdw2, cdw3, cdw4, cdw5; + __le32 doff; + __le32 dlen; + __le32 rsvd0, rsvd1; + __le32 cdw10, cdw11, cdw12, cdw13, cdw14, cdw15; +} __attribute((packed)); + +/** + * struct nvme_mi_admin_resp_hdr - Admin command response header. + * @hdr: Generic MI message header + * @status: Generic response code, non-zero on failure + * @rsvd0: Reserved + * @cdw0: Completion Queue Entry doubleword 0 + * @cdw1: Completion Queue Entry doubleword 1 + * @cdw3: Completion Queue Entry doubleword 3 + * + * This is the generic response format with the three doublewords of completion + * queue data, plus optional response data. + */ +struct nvme_mi_admin_resp_hdr { + struct nvme_mi_msg_hdr hdr; + __u8 status; + __u8 rsvd0[3]; + __le32 cdw0, cdw1, cdw3; +} __attribute__((packed)); + + +/** + * nvme_mi_create_root() - Create top-level MI (root) handle. + * @fp: File descriptor for logging messages + * @log_level: Logging level to use + * + * Create the top-level (library) handle for creating subsequent endpoint + * objects. Similar to nvme_create_root(), but we provide this to allow linking + * without the core libnvme. + * + * Return: new root object, or NULL on failure. + * + * See &nvme_create_root. + */ +nvme_root_t nvme_mi_create_root(FILE *fp, int log_level); + +/** + * nvme_mi_free_root() - Free root object. + * @root: root to free + */ +void nvme_mi_free_root(nvme_root_t root); + +/* Top level management object: NVMe-MI Management Endpoint */ +struct nvme_mi_ep; + +/** + * typedef nvme_mi_ep_t - MI Endpoint object. + * + * Represents our communication endpoint on the remote MI-capable device. + * To be used for direct MI commands for the endpoint (through the + * nvme_mi_mi_* functions(), or to communicate with individual controllers + * (see &nvme_mi_init_ctrl). + * + * Endpoints are created through a transport-specific constructor; currently + * only MCTP-connected endpoints are supported, through &nvme_mi_open_mctp. + * Subsequent operations on the endpoint (and related controllers) are + * transport-independent. + */ +typedef struct nvme_mi_ep * nvme_mi_ep_t; + +/** + * nvme_mi_first_endpoint - Start endpoint iterator + * @m: &nvme_root_t object + * + * Return: first MI endpoint object under this root, or NULL if no endpoints + * are present. + * + * See: &nvme_mi_next_endpoint, &nvme_mi_for_each_endpoint + */ +nvme_mi_ep_t nvme_mi_first_endpoint(nvme_root_t m); + +/** + * nvme_mi_next_endpoint - Continue endpoint iterator + * @m: &nvme_root_t object + * @e: &nvme_mi_ep_t current position of iterator + * + * Return: next endpoint MI endpoint object after @e under this root, or NULL + * if no further endpoints are present. + * + * See: &nvme_mi_first_endpoint, &nvme_mi_for_each_endpoint + */ +nvme_mi_ep_t nvme_mi_next_endpoint(nvme_root_t m, nvme_mi_ep_t e); + +/** + * nvme_mi_for_each_endpoint - Iterator for NVMe-MI endpoints. + * @m: &nvme_root_t containing endpoints + * @e: &nvme_mi_ep_t object, set on each iteration + */ +#define nvme_mi_for_each_endpoint(m, e) \ + for (e = nvme_mi_first_endpoint(m); e != NULL; \ + e = nvme_mi_next_endpoint(m, e)) + +/** + * nvme_mi_for_each_endpoint_safe - Iterator for NVMe-MI endpoints, allowing + * deletion during traversal + * @m: &nvme_root_t containing endpoints + * @e: &nvme_mi_ep_t object, set on each iteration + * @_e: &nvme_mi_ep_t object used as temporary storage + */ +#define nvme_mi_for_each_endpoint_safe(m, e, _e) \ + for (e = nvme_mi_first_endpoint(m), _e = nvme_mi_next_endpoint(m, e); \ + e != NULL; \ + e = _e, _e = nvme_mi_next_endpoint(m, e)) + +struct nvme_mi_ctrl; + +/** + * typedef nvme_mi_ctrl_t - NVMe-MI Controller object. + * + * Provides NVMe command functionality, through the MI interface. + */ +typedef struct nvme_mi_ctrl * nvme_mi_ctrl_t; + +/** + * nvme_mi_first_ctrl - Start controller iterator + * @ep: &nvme_mi_ep_t object + * + * Return: first MI controller object under this root, or NULL if no controllers + * are present. + * + * See: &nvme_mi_next_ctrl, &nvme_mi_for_each_ctrl + */ +nvme_mi_ctrl_t nvme_mi_first_ctrl(nvme_mi_ep_t ep); + +/** + * nvme_mi_next_ctrl - Continue ctrl iterator + * @ep: &nvme_mi_ep_t object + * @c: &nvme_mi_ctrl_t current position of iterator + * + * Return: next MI controller object after @c under this endpoint, or NULL + * if no further controllers are present. + * + * See: &nvme_mi_first_ctrl, &nvme_mi_for_each_ctrl + */ +nvme_mi_ctrl_t nvme_mi_next_ctrl(nvme_mi_ep_t ep, nvme_mi_ctrl_t c); + +/** + * nvme_mi_for_each_ctrl - Iterator for NVMe-MI controllers. + * @ep: &nvme_mi_ep_t containing endpoints + * @c: &nvme_mi_ctrl_t object, set on each iteration + * + * Allows iteration of the list of controllers behind an endpoint. Unless the + * controllers have already been created explicitly, you'll probably want to + * call &nvme_mi_scan_ep() to scan for the controllers first. + * + * See: &nvme_mi_scan_ep() + */ +#define nvme_mi_for_each_ctrl(ep, c) \ + for (c = nvme_mi_first_ctrl(ep); c != NULL; \ + c = nvme_mi_next_ctrl(ep, c)) + +/** + * nvme_mi_for_each_ctrl_safe - Iterator for NVMe-MI controllers, allowing + * deletion during traversal + * @ep: &nvme_mi_ep_t containing controllers + * @c: &nvme_mi_ctrl_t object, set on each iteration + * @_c: &nvme_mi_ctrl_t object used as temporary storage + * + * Allows iteration of the list of controllers behind an endpoint, safe against + * deletion during iteration. Unless the controllers have already been created + * explicitly (or you're just iterating to destroy controllers) you'll probably + * want to call &nvme_mi_scan_ep() to scan for the controllers first. + * + * See: &nvme_mi_scan_ep() + */ +#define nvme_mi_for_each_ctrl_safe(ep, c, _c) \ + for (c = nvme_mi_first_ctrl(ep), _c = nvme_mi_next_ctrl(ep, c); \ + c != NULL; \ + c = _c, _c = nvme_mi_next_ctrl(ep, c)) + +/** + * nvme_mi_open_mctp() - Create an endpoint using a MCTP connection. + * @root: root object to create under + * @netid: MCTP network ID on this system + * @eid: MCTP endpoint ID + * + * Transport-specific endpoint initialization for MI-connected endpoints. Once + * an endpoint is created, the rest of the API is transport-independent. + * + * Return: New endpoint object for @netid & @eid, or NULL on failure. + * + * See &nvme_mi_close + */ +nvme_mi_ep_t nvme_mi_open_mctp(nvme_root_t root, unsigned int netid, uint8_t eid); + +/** + * nvme_mi_close() - Close an endpoint connection and release resources, + * including controller objects. + * + * @ep: Endpoint object to close + */ +void nvme_mi_close(nvme_mi_ep_t ep); + +/** + * nvme_mi_scan_mctp - look for MCTP-connected NVMe-MI endpoints. + * + * Description: This function queries the system MCTP daemon ("mctpd") over + * D-Bus, to find MCTP endpoints that report support for NVMe-MI over MCTP. + * + * This requires libvnme-mi to be compiled with D-Bus support; if not, this + * will return NULL. + * + * Return: A @nvme_root_t populated with a set of MCTP-connected endpoints, + * or NULL on failure + */ +nvme_root_t nvme_mi_scan_mctp(void); + +/** + * nvme_mi_scan_ep - query an endpoint for its NVMe controllers. + * @ep: Endpoint to scan + * @force_rescan: close existing controllers and rescan + * + * This function queries an MI endpoint for the controllers available, by + * performing an MI Read MI Data Structure command (requesting the + * controller list). The controllers are stored in the endpoint's internal + * list, and can be iterated with nvme_mi_for_each_ctrl. + * + * This will only scan the endpoint once, unless @force_rescan is set. If + * so, all existing controller objects will be freed - the caller must not + * hold a reference to those across this call. + * + * Return: 0 on success, non-zero on failure + * + * See: &nvme_mi_for_each_ctrl + */ +int nvme_mi_scan_ep(nvme_mi_ep_t ep, bool force_rescan); + +/** + * nvme_mi_init_ctrl() - initialise a NVMe controller. + * @ep: Endpoint to create under + * @ctrl_id: ID of controller to initialize. + * + * Create a connection to a controller behind the endpoint specified in @ep. + * Controller IDs may be queried from the endpoint through + * &nvme_mi_mi_read_mi_data_ctrl_list. + * + * Return: New controller object, or NULL on failure. + * + * See &nvme_mi_close_ctrl + */ +nvme_mi_ctrl_t nvme_mi_init_ctrl(nvme_mi_ep_t ep, __u16 ctrl_id); + +/** + * nvme_mi_close_ctrl() - free a controller + * @ctrl: controller to free + */ +void nvme_mi_close_ctrl(nvme_mi_ctrl_t ctrl); + +/** + * nvme_mi_endpoint_desc - Get a string describing a MI endpoint. + * @ep: endpoint to describe + * + * Generates a human-readable string describing the endpoint, with possibly + * transport-specific data. The string is allocated during the call, and the + * caller is responsible for free()-ing the string. + * + * Return: a newly-allocated string containing the endpoint description, or + * NULL on failure. + */ +char *nvme_mi_endpoint_desc(nvme_mi_ep_t ep); + +/* MI Command API: nvme_mi_mi_ prefix */ + +/** + * nvme_mi_mi_read_mi_data_subsys() - Perform a Read MI Data Structure command, + * retrieving subsystem data. + * @ep: endpoint for MI communication + * @s: subsystem information to populate + * + * Retrieves the Subsystem information - number of external ports and + * NVMe version information. See &struct nvme_mi_read_nvm_ss_info. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_read_mi_data_subsys(nvme_mi_ep_t ep, + struct nvme_mi_read_nvm_ss_info *s); + +/** + * nvme_mi_mi_read_mi_data_port() - Perform a Read MI Data Structure command, + * retrieving port data. + * @ep: endpoint for MI communication + * @portid: id of port data to retrieve + * @p: port information to populate + * + * Retrieves the Port information, for the specified port ID. The subsystem + * data (from &nvme_mi_mi_read_mi_data_subsys) nmp field contains the allowed + * range of port IDs. + * + * See &struct nvme_mi_read_port_info. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_read_mi_data_port(nvme_mi_ep_t ep, __u8 portid, + struct nvme_mi_read_port_info *p); + +/** + * nvme_mi_mi_read_mi_data_ctrl_list() - Perform a Read MI Data Structure + * command, retrieving the list of attached controllers. + * @ep: endpoint for MI communication + * @start_ctrlid: starting controller ID + * @list: controller list to populate + * + * Retrieves the list of attached controllers, with IDs greater than or + * equal to @start_ctrlid. + * + * See &struct nvme_ctrl_list. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_read_mi_data_ctrl_list(nvme_mi_ep_t ep, __u8 start_ctrlid, + struct nvme_ctrl_list *list); + +/** + * nvme_mi_mi_read_mi_data_ctrl() - Perform a Read MI Data Structure command, + * retrieving controller information + * @ep: endpoint for MI communication + * @ctrl_id: ID of controller to query + * @ctrl: controller data to populate + * + * Retrieves the Controller Information Data Structure for the attached + * controller with ID @ctrlid. + * + * See &struct nvme_mi_read_ctrl_info. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_read_mi_data_ctrl(nvme_mi_ep_t ep, __u16 ctrl_id, + struct nvme_mi_read_ctrl_info *ctrl); + +/** + * nvme_mi_mi_subsystem_health_status_poll() - Read the Subsystem Health + * Data Structure from the NVM subsystem + * @ep: endpoint for MI communication + * @clear: flag to clear the Composite Controller Status state + * @nshds: subsystem health status data to populate + * + * Retrieves the Subsystem Health Data Structure into @nshds. If @clear is + * set, requests that the Composite Controller Status bits are cleared after + * the read. See NVMe-MI section 5.6 for details on the CCS bits. + * + * See &struct nvme_mi_nvm_ss_health_status. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_subsystem_health_status_poll(nvme_mi_ep_t ep, bool clear, + struct nvme_mi_nvm_ss_health_status *nshds); + +/** + * nvme_mi_mi_config_get - query a configuration parameter + * @ep: endpoint for MI communication + * @dw0: management doubleword 0, containing configuration identifier, plus + * config-specific fields + * @dw1: management doubleword 0, config-specific. + * @nmresp: set to queried configuration data in NMRESP field of response. + * + * Performs a MI Configuration Get command, with the configuration identifier + * as the LSB of @dw0. Other @dw0 and @dw1 data is configuration-identifier + * specific. + * + * On a successful Configuration Get, the @nmresp pointer will be populated with + * the bytes from the 3-byte NMRESP field, converted to native endian. + * + * See &enum nvme_mi_config_id for identifiers. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_config_get(nvme_mi_ep_t ep, __u32 dw0, __u32 dw1, + __u32 *nmresp); + +/** + * nvme_mi_mi_config_set - set a configuration parameter + * @ep: endpoint for MI communication + * @dw0: management doubleword 0, containing configuration identifier, plus + * config-specific fields + * @dw1: management doubleword 0, config-specific. + * + * Performs a MI Configuration Set command, with the command as the LSB of + * @dw0. Other @dw0 and @dw1 data is configuration-identifier specific. + * + * See &enum nvme_mi_config_id for identifiers. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_mi_config_set(nvme_mi_ep_t ep, __u32 dw0, __u32 dw1); + +/** + * nvme_mi_mi_config_get_smbus_freq - get configuration: SMBus port frequency + * @ep: endpoint for MI communication + * @port: port ID to query + * @freq: output value for current frequency configuration + * + * Performs a MI Configuration Get, to query the current SMBus frequency of + * the port specified in @port. On success, populates @freq with the port + * frequency + * + * Return: 0 on success, non-zero on failure. + */ +static inline int nvme_mi_mi_config_get_smbus_freq(nvme_mi_ep_t ep, __u8 port, + enum nvme_mi_config_smbus_freq *freq) +{ + __u32 tmp, dw0; + int rc; + + dw0 = port << 24 | NVME_MI_CONFIG_SMBUS_FREQ; + + rc = nvme_mi_mi_config_get(ep, dw0, 0, &tmp); + if (!rc) + *freq = tmp & 0x3; + return rc; +} + +/** + * nvme_mi_mi_config_set_smbus_freq - set configuration: SMBus port frequency + * @ep: endpoint for MI communication + * @port: port ID to set + * @freq: new frequency configuration + * + * Performs a MI Configuration Set, to update the current SMBus frequency of + * the port specified in @port. + * + * See &struct nvme_mi_read_port_info for the maximum supported SMBus frequency + * for the port. + * + * Return: 0 on success, non-zero on failure. + */ +static inline int nvme_mi_mi_config_set_smbus_freq(nvme_mi_ep_t ep, __u8 port, + enum nvme_mi_config_smbus_freq freq) +{ + __u32 dw0 = port << 24 | + (freq & 0x3) << 8 | + NVME_MI_CONFIG_SMBUS_FREQ; + + return nvme_mi_mi_config_set(ep, dw0, 0); +} + +/** + * nvme_mi_mi_config_set_health_status_change - clear CCS bits in health status + * @ep: endpoint for MI communication + * @mask: bitmask to clear + * + * Performs a MI Configuration Set, to update the current health status poll + * values of the Composite Controller Status bits. Bits set in @mask will + * be cleared from future health status poll data, and may be re-triggered by + * a future health change event. + * + * See &nvme_mi_mi_subsystem_health_status_poll(), &enum nvme_mi_ccs for + * values in @mask. + * + * Return: 0 on success, non-zero on failure. + */ +static inline int nvme_mi_mi_config_set_health_status_change(nvme_mi_ep_t ep, + __u32 mask) +{ + return nvme_mi_mi_config_set(ep, NVME_MI_CONFIG_HEALTH_STATUS_CHANGE, + mask); +} + +/** + * nvme_mi_mi_config_get_mctp_mtu - get configuration: MCTP MTU + * @ep: endpoint for MI communication + * @port: port ID to query + * @mtu: output value for current MCTP MTU configuration + * + * Performs a MI Configuration Get, to query the current MCTP Maximum + * Transmission Unit size (MTU) of the port specified in @port. On success, + * populates @mtu with the MTU. + * + * The default reset value is 64, corresponding to the MCTP baseline MTU. + * + * Some controllers may also use this as the maximum receive unit size, and + * may not accept MCTP messages larger than the configured MTU. + * + * Return: 0 on success, non-zero on failure. + */ +static inline int nvme_mi_mi_config_get_mctp_mtu(nvme_mi_ep_t ep, __u8 port, + __u16 *mtu) +{ + __u32 tmp, dw0; + int rc; + + dw0 = port << 24 | NVME_MI_CONFIG_MCTP_MTU; + + rc = nvme_mi_mi_config_get(ep, dw0, 0, &tmp); + if (!rc) + *mtu = tmp & 0xffff; + return rc; +} + +/** + * nvme_mi_mi_config_set_mctp_mtu - set configuration: MCTP MTU + * @ep: endpoint for MI communication + * @port: port ID to set + * @mtu: new MTU configuration + * + * Performs a MI Configuration Set, to update the current MCTP MTU value for + * the port specified in @port. + * + * Some controllers may also use this as the maximum receive unit size, and + * may not accept MCTP messages larger than the configured MTU. When setting + * this value, you will likely need to change the MTU of the local MCTP + * interface(s) to match. + * + * Return: 0 on success, non-zero on failure. + */ +static inline int nvme_mi_mi_config_set_mctp_mtu(nvme_mi_ep_t ep, __u8 port, + __u16 mtu) +{ + __u32 dw0 = port << 24 | NVME_MI_CONFIG_MCTP_MTU; + + return nvme_mi_mi_config_set(ep, dw0, mtu); +} + +/* Admin channel functions */ + +/** + * nvme_mi_admin_xfer() - Raw admin transfer interface. + * @ctrl: controller to send the admin command to + * @admin_req: request data + * @req_data_size: size of request data payload + * @admin_resp: buffer for response data + * @resp_data_offset: offset into request data to retrieve from controller + * @resp_data_size: size of response data buffer, updated to received size + * + * Performs an arbitrary NVMe Admin command, using the provided request data, + * in @admin_req. The size of the request data *payload* is specified in + * @req_data_size - this does not include the standard header length (so a + * header-only request would have a size of 0). + * + * On success, response data is stored in @admin_resp, which has an optional + * appended payload buffer of @resp_data_size bytes. The actual payload + * transferred will be stored in @resp_data_size. These sizes do not include + * the Admin request header, so 0 represents no payload. + * + * As with all Admin commands, we can request partial data from the Admin + * Response payload, offset by @resp_data_offset. + * + * See: &struct nvme_mi_admin_req_hdr and &struct nvme_mi_admin_resp_hdr. + * + * Return: 0 on success, non-zero on failure. + */ +int nvme_mi_admin_xfer(nvme_mi_ctrl_t ctrl, + struct nvme_mi_admin_req_hdr *admin_req, + size_t req_data_size, + struct nvme_mi_admin_resp_hdr *admin_resp, + off_t resp_data_offset, + size_t *resp_data_size); + +/** + * nvme_mi_admin_identify_partial() - Perform an Admin identify command, + * and retrieve partial response data. + * @ctrl: Controller to process identify command + * @args: Identify command arguments + * @offset: offset of identify data to retrieve from response + * @size: size of identify data to return + * + * Perform an Identify command, using the Identify command parameters in @args. + * The @offset and @size arguments allow the caller to retrieve part of + * the identify response. See NVMe-MI section 6.2 for the semantics (and some + * handy diagrams) of the offset & size parameters. + * + * Will return an error if the length of the response data (from the controller) + * did not match @size. + * + * Unless you're performing a vendor-unique identify command, You'll probably + * want to use one of the identify helpers (nvme_mi_admin_identify, + * nvme_mi_admin_identify_cns_nsid, or nvme_mi_admin_identify_<type>) instead + * of this. If the type of your identify command is standardized but not + * yet supported by libnvme-mi, please contact the maintainers. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_identify_args + */ +int nvme_mi_admin_identify_partial(nvme_mi_ctrl_t ctrl, + struct nvme_identify_args *args, + off_t offset, size_t size); + +/** + * nvme_mi_admin_identify() - Perform an Admin identify command. + * @ctrl: Controller to process identify command + * @args: Identify command arguments + * + * Perform an Identify command, using the Identify command parameters in @args. + * Stores the identify data in ->data, and (if set) the result from cdw0 + * into args->result. + * + * Will return an error if the length of the response data (from the + * controller) is not a full &NVME_IDENTIFY_DATA_SIZE. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_identify_args + */ +static inline int nvme_mi_admin_identify(nvme_mi_ctrl_t ctrl, + struct nvme_identify_args *args) +{ + return nvme_mi_admin_identify_partial(ctrl, args, + 0, NVME_IDENTIFY_DATA_SIZE); +} + +/** + * nvme_mi_admin_identify_cns_nsid() - Perform an Admin identify command using + * specific CNS/NSID parameters. + * @ctrl: Controller to process identify command + * @cns: Controller or Namespace Structure, specifying identified object + * @nsid: namespace ID + * @data: buffer for identify data response + * + * Perform an Identify command, using the CNS specifier @cns, and the + * namespace ID @nsid if required by the CNS type. + * + * Stores the identify data in @data, which is expected to be a buffer of + * &NVME_IDENTIFY_DATA_SIZE bytes. + * + * Will return an error if the length of the response data (from the + * controller) is not a full &NVME_IDENTIFY_DATA_SIZE. + * + * Return: 0 on success, non-zero on failure + */ +static inline int nvme_mi_admin_identify_cns_nsid(nvme_mi_ctrl_t ctrl, + enum nvme_identify_cns cns, + __u32 nsid, void *data) +{ + struct nvme_identify_args args = { + .result = NULL, + .data = data, + .args_size = sizeof(args), + .cns = cns, + .csi = NVME_CSI_NVM, + .nsid = nsid, + .cntid = NVME_CNTLID_NONE, + .cns_specific_id = NVME_CNSSPECID_NONE, + .uuidx = NVME_UUID_NONE, + }; + + return nvme_mi_admin_identify(ctrl, &args); +} + +/** + * nvme_mi_admin_identify_ctrl() - Perform an Admin identify for a controller + * @ctrl: Controller to process identify command + * @id: Controller identify data to populate + * + * Perform an Identify command, for the controller specified by @ctrl, + * writing identify data to @id. + * + * Will return an error if the length of the response data (from the + * controller) is not a full &NVME_IDENTIFY_DATA_SIZE, so @id will be + * fully populated on success. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_id_ctrl + */ +static inline int nvme_mi_admin_identify_ctrl(nvme_mi_ctrl_t ctrl, + struct nvme_id_ctrl *id) +{ + return nvme_mi_admin_identify_cns_nsid(ctrl, NVME_IDENTIFY_CNS_CTRL, + NVME_NSID_NONE, id); +} + +/** + * nvme_mi_admin_identify_ctrl_list() - Perform an Admin identify for a + * controller list. + * @ctrl: Controller to process identify command + * @cntid: Controller ID to specify list start + * @list: List data to populate + * + * Perform an Identify command, for the controller list starting with + * IDs greater than or equal to @cntid. + * + * Will return an error if the length of the response data (from the + * controller) is not a full &NVME_IDENTIFY_DATA_SIZE, so @id will be + * fully populated on success. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_ctrl_list + */ +static inline int nvme_mi_admin_identify_ctrl_list(nvme_mi_ctrl_t ctrl, + __u16 cntid, + struct nvme_ctrl_list *list) +{ + struct nvme_identify_args args = { + .result = NULL, + .data = list, + .args_size = sizeof(args), + .cns = NVME_IDENTIFY_CNS_CTRL_LIST, + .csi = NVME_CSI_NVM, + .nsid = NVME_NSID_NONE, + .cntid = cntid, + .cns_specific_id = NVME_CNSSPECID_NONE, + .uuidx = NVME_UUID_NONE, + }; + + return nvme_mi_admin_identify(ctrl, &args); +} + +/** + * nvme_mi_admin_get_log_page() - Retrieve log page data from controller + * @ctrl: Controller to query + * @args: Get Log Page command arguments + * + * Performs a Get Log Page Admin command as specified by @args. Response data + * is stored in @args->data, which should be a buffer of @args->data_len bytes. + * Resulting data length is stored in @args->data_len on successful + * command completion. + * + * This request may be implemented as multiple log page commands, in order + * to fit within MI message-size limits. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_get_log_args + */ +int nvme_mi_admin_get_log_page(nvme_mi_ctrl_t ctrl, + struct nvme_get_log_args *args); + +/** + * nvme_mi_admin_security_send() - Perform a Security Send command on a + * controller. + * @ctrl: Controller to send command to + * @args: Security Send command arguments + * + * Performs a Security Send Admin command as specified by @args. Response data + * is stored in @args->data, which should be a buffer of @args->data_len bytes. + * Resulting data length is stored in @args->data_len on successful + * command completion. + * + * Security Send data length should not be greater than 4096 bytes to + * comply with specification limits. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_get_log_args + */ +int nvme_mi_admin_security_send(nvme_mi_ctrl_t ctrl, + struct nvme_security_send_args *args); + +/** + * nvme_mi_admin_security_recv() - Perform a Security Receive command on a + * controller. + * @ctrl: Controller to send command to + * @args: Security Receive command arguments + * + * Performs a Security Receive Admin command as specified by @args. Response + * data is stored in @args->data, which should be a buffer of @args->data_len + * bytes. Resulting data length is stored in @args->data_len on successful + * command completion. + * + * Security Receive data length should not be greater than 4096 bytes to + * comply with specification limits. + * + * Return: 0 on success, non-zero on failure + * + * See: &struct nvme_get_log_args + */ +int nvme_mi_admin_security_recv(nvme_mi_ctrl_t ctrl, + struct nvme_security_receive_args *args); + + +#endif /* _LIBNVME_MI_MI_H */ |