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134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
#ifndef _GPXE_AOE_H
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#define _GPXE_AOE_H
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/** @file
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*
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* AoE protocol
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*
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*/
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#include <stdint.h>
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#include <gpxe/list.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/retry.h>
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#include <gpxe/async.h>
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#include <gpxe/ata.h>
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/** An AoE ATA command */
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struct aoecmd {
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/** AoE command flags */
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uint8_t aflags;
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/** ATA error/feature register */
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uint8_t err_feat;
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/** ATA sector count register */
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uint8_t count;
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/** ATA command/status register */
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uint8_t cmd_stat;
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/** Logical block address, in little-endian order */
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union {
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uint64_t u64;
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uint8_t bytes[6];
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} lba;
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/** Data payload */
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uint8_t data[0];
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} __attribute__ (( packed ));
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#define AOE_FL_EXTENDED 0x40 /**< LBA48 extended addressing */
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#define AOE_FL_DEV_HEAD 0x10 /**< Device/head flag */
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#define AOE_FL_ASYNC 0x02 /**< Asynchronous write */
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#define AOE_FL_WRITE 0x01 /**< Write command */
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/** An AoE header */
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struct aoehdr {
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/** Protocol version number and flags */
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uint8_t ver_flags;
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/** Error code */
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uint8_t error;
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/** Major device number, in network byte order */
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uint16_t major;
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/** Minor device number */
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uint8_t minor;
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/** Command number */
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uint8_t command;
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/** Tag, in network byte order */
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uint32_t tag;
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/** Payload */
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union {
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/** ATA command */
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struct aoecmd command[0];
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} arg;
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} __attribute__ (( packed ));
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#define AOE_VERSION 0x10 /**< Version 1 */
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#define AOE_VERSION_MASK 0xf0 /**< Version part of ver_flags field */
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#define AOE_FL_RESPONSE 0x08 /**< Message is a response */
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#define AOE_FL_ERROR 0x04 /**< Command generated an error */
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#define AOE_MAJOR_BROADCAST 0xffff
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#define AOE_MINOR_BROADCAST 0xff
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#define AOE_CMD_ATA 0x00 /**< Issue ATA command */
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#define AOE_CMD_CONFIG 0x01 /**< Query Config Information */
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#define AOE_TAG_MAGIC 0xebeb0000
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#define AOE_ERR_BAD_COMMAND 1 /**< Unrecognised command code */
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#define AOE_ERR_BAD_PARAMETER 2 /**< Bad argument parameter */
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#define AOE_ERR_UNAVAILABLE 3 /**< Device unavailable */
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#define AOE_ERR_CONFIG_EXISTS 4 /**< Config string present */
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#define AOE_ERR_BAD_VERSION 5 /**< Unsupported version */
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/** An AoE session */
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struct aoe_session {
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/** List of all AoE sessions */
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struct list_head list;
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/** Network device */
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struct net_device *netdev;
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/** Major number */
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uint16_t major;
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/** Minor number */
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uint8_t minor;
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/** Target MAC address */
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uint8_t target[ETH_ALEN];
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/** Tag for current AoE command */
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uint32_t tag;
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/** Current ATA command */
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struct ata_command *command;
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/** Overall status of current ATA command */
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unsigned int status;
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/** Byte offset within command's data buffer */
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unsigned int command_offset;
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/** Asynchronous operation for this command */
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struct async_operation aop;
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/** Retransmission timer */
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struct retry_timer timer;
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};
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#define AOE_STATUS_ERR_MASK 0x0f /**< Error portion of status code */
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#define AOE_STATUS_PENDING 0x80 /**< Command pending */
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/** Maximum number of sectors per packet */
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#define AOE_MAX_COUNT 2
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extern void aoe_open ( struct aoe_session *aoe );
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extern void aoe_close ( struct aoe_session *aoe );
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extern struct async_operation * aoe_issue ( struct aoe_session *aoe,
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struct ata_command *command );
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/** An AoE device */
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struct aoe_device {
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/** ATA device interface */
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struct ata_device ata;
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/** AoE protocol instance */
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struct aoe_session aoe;
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};
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extern int init_aoedev ( struct aoe_device *aoedev );
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#endif /* _GPXE_AOE_H */
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