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 #ifdef __KERNEL__
  52 #include <linux/skbuff.h>
  53
  54 static inline struct aoe_hdr *aoe_hdr(const struct sk_buff *skb)
  55 {
  56         return (struct aoe_hdr *)skb_mac_header(skb);
  57 }
  58 #endif
  59
  60 struct aoe_atahdr {
  61         unsigned char aflags;
  62         unsigned char errfeat;
  63         unsigned char scnt;
  64         unsigned char cmdstat;
  65         unsigned char lba0;
  66         unsigned char lba1;
  67         unsigned char lba2;
  68         unsigned char lba3;
  69         unsigned char lba4;
  70         unsigned char lba5;
  71         unsigned char res[2];
  72 };
  73
  74 struct aoe_cfghdr {
  75         __be16 bufcnt;
  76         __be16 fwver;
  77         unsigned char scnt;
  78         unsigned char aoeccmd;
  79         unsigned char cslen[2];
  80 };
  81
  82 enum {
  83         DEVFL_UP = 1,   /* device is installed in system and ready for AoE->ATA commands */
  84         DEVFL_TKILL = (1<<1),   /* flag for timer to know when to kill self */
  85         DEVFL_EXT = (1<<2),     /* device accepts lba48 commands */
  86         DEVFL_CLOSEWAIT = (1<<3), /* device is waiting for all closes to revalidate */
  87         DEVFL_GDALLOC = (1<<4), /* need to alloc gendisk */
  88         DEVFL_PAUSE = (1<<5),
  89         DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
  90         DEVFL_MAXBCNT = (1<<7), /* d->maxbcnt is not changeable */
  91         DEVFL_KICKME = (1<<8),
  92
  93         BUFFL_FAIL = 1,
  94 };
  95
  96 enum {
  97         DEFAULTBCNT = 2 * 512,  /* 2 sectors */
  98         NPERSHELF = 16,         /* number of slots per shelf address */
  99         FREETAG = -1,
 100         MIN_BUFS = 8,
 101 };
 102
 103 struct buf {
 104         struct list_head bufs;
 105         ulong start_time;       /* for disk stats */
 106         ulong flags;
 107         ulong nframesout;
 108         char *bufaddr;
 109         ulong resid;
 110         ulong bv_resid;
 111         sector_t sector;
 112         struct bio *bio;
 113         struct bio_vec *bv;
 114 };
 115
 116 struct frame {
 117         int tag;
 118         ulong waited;
 119         struct buf *buf;
 120         char *bufaddr;
 121         ulong bcnt;
 122         sector_t lba;
 123         struct sk_buff *skb;
 124 };
 125
 126 struct aoedev {
 127         struct aoedev *next;
 128         unsigned char addr[6];  /* remote mac addr */
 129         ushort flags;
 130         ulong sysminor;
 131         ulong aoemajor;
 132         ulong aoeminor;
 133         u16 nopen;              /* (bd_openers isn't available without sleeping) */
 134         u16 lasttag;            /* last tag sent */
 135         u16 rttavg;             /* round trip average of requests/responses */
 136         u16 mintimer;
 137         u16 fw_ver;             /* version of blade's firmware */
 138         u16 maxbcnt;
 139         struct work_struct work;/* disk create work struct */
 140         struct gendisk *gd;
 141         struct request_queue blkq;
 142         struct hd_geometry geo;
 143         sector_t ssize;
 144         struct timer_list timer;
 145         spinlock_t lock;
 146         struct net_device *ifp; /* interface ed is attached to */
 147         struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
 148         struct sk_buff *sendq_tl;
 149         mempool_t *bufpool;     /* for deadlock-free Buf allocation */
 150         struct list_head bufq;  /* queue of bios to work on */
 151         struct buf *inprocess;  /* the one we're currently working on */
 152         ushort lostjumbo;
 153         ushort nframes;         /* number of frames below */
 154         struct frame *frames;
 155 };
 156
 157
 158 int aoeblk_init(void);
 159 void aoeblk_exit(void);
 160 void aoeblk_gdalloc(void *);
 161 void aoedisk_rm_sysfs(struct aoedev *d);
 162
 163 int aoechr_init(void);
 164 void aoechr_exit(void);
 165 void aoechr_error(char *);
 166
 167 void aoecmd_work(struct aoedev *d);
 168 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor);
 169 void aoecmd_ata_rsp(struct sk_buff *);
 170 void aoecmd_cfg_rsp(struct sk_buff *);
 171 void aoecmd_sleepwork(struct work_struct *);
 172 struct sk_buff *new_skb(ulong);
 173
 174 int aoedev_init(void);
 175 void aoedev_exit(void);
 176 struct aoedev *aoedev_by_aoeaddr(int maj, int min);
 177 struct aoedev *aoedev_by_sysminor_m(ulong sysminor, ulong bufcnt);
 178 void aoedev_downdev(struct aoedev *d);
 179 int aoedev_isbusy(struct aoedev *d);
 180
 181 int aoenet_init(void);
 182 void aoenet_exit(void);
 183 void aoenet_xmit(struct sk_buff *);
 184 int is_aoe_netif(struct net_device *ifp);
 185 int set_aoe_iflist(const char __user *str, size_t size);
 186
 187 u64 mac_addr(char addr[6]);