linux/drivers/block/aoe/aoe.h
Ed Cashin 64a80f5ac7 aoe: associate frames with the AoE storage target
In the driver code, "target" and aoetgt refer to a particular remote
interface on the AoE storage target.  The latter is identified by its AoE
major and minor addresses.  Commands that are being sent to an AoE storage
target {major, minor} can be sent or retransmitted to any of the remote
MAC addresses associated with the AoE storage target.

That is, frames are naturally associated with not an aoetgt (AoE major,
AoE minor, remote MAC address) but an aoedev (AoE major, AoE minor).
Making the code reflect that reality simplifies the driver, especially
when the path to a remote MAC address becomes unusable.

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-06 03:05:27 +09:00

231 lines
5.4 KiB
C

/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */
#define VERSION "47"
#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,
AOECMD_VEND_MIN = 0xf0,
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_KICKME = (1<<5), /* slow polling network card catch */
DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */
BUFFL_FAIL = 1,
};
enum {
DEFAULTBCNT = 2 * 512, /* 2 sectors */
NPERSHELF = 16, /* number of slots per shelf address */
FREETAG = -1,
MIN_BUFS = 16,
NTARGETS = 8,
NAOEIFS = 8,
NSKBPOOLMAX = 256,
NFACTIVE = 61,
TIMERTICK = HZ / 10,
MINTIMER = HZ >> 2,
MAXTIMER = HZ << 1,
};
struct buf {
ulong nframesout;
ulong resid;
ulong bv_resid;
sector_t sector;
struct bio *bio;
struct bio_vec *bv;
struct request *rq;
};
struct frame {
struct list_head head;
u32 tag;
ulong waited;
struct aoetgt *t; /* parent target I belong to */
sector_t lba;
struct sk_buff *skb; /* command skb freed on module exit */
struct sk_buff *r_skb; /* response skb for async processing */
struct buf *buf;
struct bio_vec *bv;
ulong bcnt;
ulong bv_off;
};
struct aoeif {
struct net_device *nd;
ulong lost;
int bcnt;
};
struct aoetgt {
unsigned char addr[6];
ushort nframes;
struct aoedev *d; /* parent device I belong to */
struct list_head ffree; /* list of free frames */
struct aoeif ifs[NAOEIFS];
struct aoeif *ifp; /* current aoeif in use */
ushort nout;
ushort maxout;
ulong falloc;
ulong lastwadj; /* last window adjustment */
int minbcnt;
int wpkts, rpkts;
};
struct aoedev {
struct aoedev *next;
ulong sysminor;
ulong aoemajor;
u16 aoeminor;
u16 flags;
u16 nopen; /* (bd_openers isn't available without sleeping) */
u16 rttavg; /* round trip average of requests/responses */
u16 mintimer;
u16 fw_ver; /* version of blade's firmware */
u16 lasttag; /* last tag sent */
u16 useme;
ulong ref;
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 sk_buff_head skbpool;
mempool_t *bufpool; /* for deadlock-free Buf allocation */
struct { /* pointers to work in progress */
struct buf *buf;
struct bio *nxbio;
struct request *rq;
} ip;
ulong maxbcnt;
struct list_head factive[NFACTIVE]; /* hash of active frames */
struct aoetgt *targets[NTARGETS];
struct aoetgt **tgt; /* target in use when working */
struct aoetgt *htgt; /* target needing rexmit assistance */
ulong ntargets;
ulong kicked;
};
/* kthread tracking */
struct ktstate {
struct completion rendez;
struct task_struct *task;
wait_queue_head_t *waitq;
int (*fn) (void);
char *name;
spinlock_t *lock;
};
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);
struct sk_buff *aoecmd_ata_rsp(struct sk_buff *);
void aoecmd_cfg_rsp(struct sk_buff *);
void aoecmd_sleepwork(struct work_struct *);
void aoecmd_cleanslate(struct aoedev *);
void aoecmd_exit(void);
int aoecmd_init(void);
struct sk_buff *aoecmd_ata_id(struct aoedev *);
void aoe_freetframe(struct frame *);
void aoe_flush_iocq(void);
void aoe_end_request(struct aoedev *, struct request *, int);
int aoe_ktstart(struct ktstate *k);
void aoe_ktstop(struct ktstate *k);
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);
void aoedev_downdev(struct aoedev *d);
int aoedev_flush(const char __user *str, size_t size);
void aoe_failbuf(struct aoedev *, struct buf *);
void aoedev_put(struct aoedev *);
int aoenet_init(void);
void aoenet_exit(void);
void aoenet_xmit(struct sk_buff_head *);
int is_aoe_netif(struct net_device *ifp);
int set_aoe_iflist(const char __user *str, size_t size);