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aoe.h

/* Copyright (c) 2006 Coraid, Inc.  See COPYING for GPL terms. */
#define VERSION "32"
#define AOE_MAJOR 152
#define DEVICE_NAME "aoe"

/* set AOE_PARTITIONS to 1 to use whole-disks only
 * default is 16, which is 15 partitions plus the whole disk
 */
#ifndef AOE_PARTITIONS
#define AOE_PARTITIONS (16)
#endif

#define SYSMINOR(aoemajor, aoeminor) ((aoemajor) * NPERSHELF + (aoeminor))
#define AOEMAJOR(sysminor) ((sysminor) / NPERSHELF)
#define AOEMINOR(sysminor) ((sysminor) % NPERSHELF)
#define WHITESPACE " \t\v\f\n"

enum {
      AOECMD_ATA,
      AOECMD_CFG,

      AOEFL_RSP = (1<<3),
      AOEFL_ERR = (1<<2),

      AOEAFL_EXT = (1<<6),
      AOEAFL_DEV = (1<<4),
      AOEAFL_ASYNC = (1<<1),
      AOEAFL_WRITE = (1<<0),

      AOECCMD_READ = 0,
      AOECCMD_TEST,
      AOECCMD_PTEST,
      AOECCMD_SET,
      AOECCMD_FSET,

      AOE_HVER = 0x10,
};

struct aoe_hdr {
      unsigned char dst[6];
      unsigned char src[6];
      __be16 type;
      unsigned char verfl;
      unsigned char err;
      __be16 major;
      unsigned char minor;
      unsigned char cmd;
      __be32 tag;
};

struct aoe_atahdr {
      unsigned char aflags;
      unsigned char errfeat;
      unsigned char scnt;
      unsigned char cmdstat;
      unsigned char lba0;
      unsigned char lba1;
      unsigned char lba2;
      unsigned char lba3;
      unsigned char lba4;
      unsigned char lba5;
      unsigned char res[2];
};

struct aoe_cfghdr {
      __be16 bufcnt;
      __be16 fwver;
      unsigned char scnt;
      unsigned char aoeccmd;
      unsigned char cslen[2];
};

enum {
      DEVFL_UP = 1,     /* device is installed in system and ready for AoE->ATA commands */
      DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
      DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
      DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
      DEVFL_GDALLOC = (1<<4), /* need to alloc gendisk */
      DEVFL_PAUSE = (1<<5),
      DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
      DEVFL_MAXBCNT = (1<<7), /* d->maxbcnt is not changeable */
      DEVFL_KICKME = (1<<8),

      BUFFL_FAIL = 1,
};

enum {
      DEFAULTBCNT = 2 * 512,  /* 2 sectors */
      NPERSHELF = 16,         /* number of slots per shelf address */
      FREETAG = -1,
      MIN_BUFS = 8,
};

struct buf {
      struct list_head bufs;
      ulong start_time; /* for disk stats */
      ulong flags;
      ulong nframesout;
      char *bufaddr;
      ulong resid;
      ulong bv_resid;
      sector_t sector;
      struct bio *bio;
      struct bio_vec *bv;
};

struct frame {
      int tag;
      ulong waited;
      struct buf *buf;
      char *bufaddr;
      ulong bcnt;
      sector_t lba;
      struct sk_buff *skb;
};

struct aoedev {
      struct aoedev *next;
      unsigned char addr[6];  /* remote mac addr */
      ushort flags;
      ulong sysminor;
      ulong aoemajor;
      ulong aoeminor;
      u16 nopen;        /* (bd_openers isn't available without sleeping) */
      u16 lasttag;            /* last tag sent */
      u16 rttavg;       /* round trip average of requests/responses */
      u16 mintimer;
      u16 fw_ver;       /* version of blade's firmware */
      u16 maxbcnt;
      struct work_struct work;/* disk create work struct */
      struct gendisk *gd;
      struct request_queue blkq;
      struct hd_geometry geo; 
      sector_t ssize;
      struct timer_list timer;
      spinlock_t lock;
      struct net_device *ifp; /* interface ed is attached to */
      struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
      struct sk_buff *sendq_tl;
      mempool_t *bufpool;     /* for deadlock-free Buf allocation */
      struct list_head bufq;  /* queue of bios to work on */
      struct buf *inprocess;  /* the one we're currently working on */
      ushort lostjumbo;
      ushort nframes;         /* number of frames below */
      struct frame *frames;
};


int aoeblk_init(void);
void aoeblk_exit(void);
void aoeblk_gdalloc(void *);
void aoedisk_rm_sysfs(struct aoedev *d);

int aoechr_init(void);
void aoechr_exit(void);
void aoechr_error(char *);

void aoecmd_work(struct aoedev *d);
void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
void aoecmd_ata_rsp(struct sk_buff *);
void aoecmd_cfg_rsp(struct sk_buff *);
void aoecmd_sleepwork(struct work_struct *);
struct sk_buff *new_skb(ulong);

int aoedev_init(void);
void aoedev_exit(void);
struct aoedev *aoedev_by_aoeaddr(int maj, int min);
struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
void aoedev_downdev(struct aoedev *d);
int aoedev_isbusy(struct aoedev *d);

int aoenet_init(void);
void aoenet_exit(void);
void aoenet_xmit(struct sk_buff *);
int is_aoe_netif(struct net_device *ifp);
int set_aoe_iflist(const char __user *str, size_t size);

u64 mac_addr(char addr[6]);

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