drivers/block/aoe/aoe.h

   1 /* Copyright (c) 2006 Coraid, Inc.  See COPYING for GPL terms. */
   2 #define VERSION "32"
   3 #define AOE_MAJOR 152
   4 #define DEVICE_NAME "aoe"
   5
   6 /* set AOE_PARTITIONS to 1 to use whole-disks only
   7  * default is 16, which is 15 partitions plus the whole disk
   8  */
   9 #ifndef AOE_PARTITIONS
  10 #define AOE_PARTITIONS (16)
  11 #endif
  12
  13 #define SYSMINOR(aoemajor, aoeminor) ((aoemajor) * NPERSHELF + (aoeminor))
  14 #define AOEMAJOR(sysminor) ((sysminor) / NPERSHELF)
  15 #define AOEMINOR(sysminor) ((sysminor) % NPERSHELF)
  16 #define WHITESPACE " \t\v\f\n"
  17
  18 enum {
  19         AOECMD_ATA,
  20         AOECMD_CFG,
  21
  22         AOEFL_RSP = (1<<3),
  23         AOEFL_ERR = (1<<2),
  24
  25         AOEAFL_EXT = (1<<6),
  26         AOEAFL_DEV = (1<<4),
  27         AOEAFL_ASYNC = (1<<1),
  28         AOEAFL_WRITE = (1<<0),
  29
  30         AOECCMD_READ = 0,
  31         AOECCMD_TEST,
  32         AOECCMD_PTEST,
  33         AOECCMD_SET,
  34         AOECCMD_FSET,
  35
  36         AOE_HVER = 0x10,
  37 };
  38
  39 struct aoe_hdr {
  40         unsigned char dst[6];
  41         unsigned char src[6];
  42         __be16 type;
  43         unsigned char verfl;
  44         unsigned char err;
  45         __be16 major;
  46         unsigned char minor;
  47         unsigned char cmd;
  48         __be32 tag;
  49 };
  50
  51 struct aoe_atahdr {
  52         unsigned char aflags;
  53         unsigned char errfeat;
  54         unsigned char scnt;
  55         unsigned char cmdstat;
  56         unsigned char lba0;
  57         unsigned char lba1;
  58         unsigned char lba2;
  59         unsigned char lba3;
  60         unsigned char lba4;
  61         unsigned char lba5;
  62         unsigned char res[2];
  63 };
  64
  65 struct aoe_cfghdr {
  66         __be16 bufcnt;
  67         __be16 fwver;
  68         unsigned char scnt;
  69         unsigned char aoeccmd;
  70         unsigned char cslen[2];
  71 };
  72
  73 enum {
  74         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  75         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  76         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  77         DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
  78         DEVFL_GDALLOC = (1<<4), /* need to alloc gendisk */
  79         DEVFL_PAUSE = (1<<5),
  80         DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  81         DEVFL_MAXBCNT = (1<<7), /* d->maxbcnt is not changeable */
  82         DEVFL_KICKME = (1<<8),
  83
  84         BUFFL_FAIL = 1,
  85 };
  86
  87 enum {
  88         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  89         NPERSHELF = 16,         /* number of slots per shelf address */
  90         FREETAG = -1,
  91         MIN_BUFS = 8,
  92 };
  93
  94 struct buf {
  95         struct list_head bufs;
  96         ulong start_time;       /* for disk stats */
  97         ulong flags;
  98         ulong nframesout;
  99         char *bufaddr;
 100         ulong resid;
 101         ulong bv_resid;
 102         sector_t sector;
 103         struct bio *bio;
 104         struct bio_vec *bv;
 105 };
 106
 107 struct frame {
 108         int tag;
 109         ulong waited;
 110         struct buf *buf;
 111         char *bufaddr;
 112         ulong bcnt;
 113         sector_t lba;
 114         struct sk_buff *skb;
 115 };
 116
 117 struct aoedev {
 118         struct aoedev *next;
 119         unsigned char addr[6];  /* remote mac addr */
 120         ushort flags;
 121         ulong sysminor;
 122         ulong aoemajor;
 123         ulong aoeminor;
 124         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 125         u16 lasttag;            /* last tag sent */
 126         u16 rttavg;             /* round trip average of requests/responses */
 127         u16 mintimer;
 128         u16 fw_ver;             /* version of blade's firmware */
 129         u16 maxbcnt;
 130         struct work_struct work;/* disk create work struct */
 131         struct gendisk *gd;
 132         request_queue_t blkq;
 133         struct hd_geometry geo;
 134         sector_t ssize;
 135         struct timer_list timer;
 136         spinlock_t lock;
 137         struct net_device *ifp; /* interface ed is attached to */
 138         struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
 139         struct sk_buff *sendq_tl;
 140         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 141         struct list_head bufq;  /* queue of bios to work on */
 142         struct buf *inprocess;  /* the one we're currently working on */
 143         ushort lostjumbo;
 144         ushort nframes;         /* number of frames below */
 145         struct frame *frames;
 146 };
 147
 148
 149 int aoeblk_init(void);
 150 void aoeblk_exit(void);
 151 void aoeblk_gdalloc(void *);
 152 void aoedisk_rm_sysfs(struct aoedev *d);
 153
 154 int aoechr_init(void);
 155 void aoechr_exit(void);
 156 void aoechr_error(char *);
 157
 158 void aoecmd_work(struct aoedev *d);
 159 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 160 void aoecmd_ata_rsp(struct sk_buff *);
 161 void aoecmd_cfg_rsp(struct sk_buff *);
 162 void aoecmd_sleepwork(struct work_struct *);
 163 struct sk_buff *new_skb(ulong);
 164
 165 int aoedev_init(void);
 166 void aoedev_exit(void);
 167 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 168 struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
 169 void aoedev_downdev(struct aoedev *d);
 170 int aoedev_isbusy(struct aoedev *d);
 171
 172 int aoenet_init(void);
 173 void aoenet_exit(void);
 174 void aoenet_xmit(struct sk_buff *);
 175 int is_aoe_netif(struct net_device *ifp);
 176 int set_aoe_iflist(const char __user *str, size_t size);
 177
 178 u64 mac_addr(char addr[6]);