1 /* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */ 2 #define VERSION "81" 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 WHITESPACE " \t\v\f\n," 14 15 enum { 16 AOECMD_ATA, 17 AOECMD_CFG, 18 AOECMD_VEND_MIN = 0xf0, 19 20 AOEFL_RSP = (1<<3), 21 AOEFL_ERR = (1<<2), 22 23 AOEAFL_EXT = (1<<6), 24 AOEAFL_DEV = (1<<4), 25 AOEAFL_ASYNC = (1<<1), 26 AOEAFL_WRITE = (1<<0), 27 28 AOECCMD_READ = 0, 29 AOECCMD_TEST, 30 AOECCMD_PTEST, 31 AOECCMD_SET, 32 AOECCMD_FSET, 33 34 AOE_HVER = 0x10, 35 }; 36 37 struct aoe_hdr { 38 unsigned char dst[6]; 39 unsigned char src[6]; 40 __be16 type; 41 unsigned char verfl; 42 unsigned char err; 43 __be16 major; 44 unsigned char minor; 45 unsigned char cmd; 46 __be32 tag; 47 }; 48 49 struct aoe_atahdr { 50 unsigned char aflags; 51 unsigned char errfeat; 52 unsigned char scnt; 53 unsigned char cmdstat; 54 unsigned char lba0; 55 unsigned char lba1; 56 unsigned char lba2; 57 unsigned char lba3; 58 unsigned char lba4; 59 unsigned char lba5; 60 unsigned char res[2]; 61 }; 62 63 struct aoe_cfghdr { 64 __be16 bufcnt; 65 __be16 fwver; 66 unsigned char scnt; 67 unsigned char aoeccmd; 68 unsigned char cslen[2]; 69 }; 70 71 enum { 72 DEVFL_UP = 1, /* device is installed in system and ready for AoE->ATA commands */ 73 DEVFL_TKILL = (1<<1), /* flag for timer to know when to kill self */ 74 DEVFL_EXT = (1<<2), /* device accepts lba48 commands */ 75 DEVFL_GDALLOC = (1<<3), /* need to alloc gendisk */ 76 DEVFL_GD_NOW = (1<<4), /* allocating gendisk */ 77 DEVFL_KICKME = (1<<5), /* slow polling network card catch */ 78 DEVFL_NEWSIZE = (1<<6), /* need to update dev size in block layer */ 79 DEVFL_FREEING = (1<<7), /* set when device is being cleaned up */ 80 DEVFL_FREED = (1<<8), /* device has been cleaned up */ 81 }; 82 83 enum { 84 DEFAULTBCNT = 2 * 512, /* 2 sectors */ 85 MIN_BUFS = 16, 86 NTARGETS = 4, 87 NAOEIFS = 8, 88 NSKBPOOLMAX = 256, 89 NFACTIVE = 61, 90 91 TIMERTICK = HZ / 10, 92 RTTSCALE = 8, 93 RTTDSCALE = 3, 94 RTTAVG_INIT = USEC_PER_SEC / 4 << RTTSCALE, 95 RTTDEV_INIT = RTTAVG_INIT / 4, 96 97 HARD_SCORN_SECS = 10, /* try another remote port after this */ 98 MAX_TAINT = 1000, /* cap on aoetgt taint */ 99 }; 100 101 struct buf { 102 ulong nframesout; 103 ulong resid; 104 ulong bv_resid; 105 sector_t sector; 106 struct bio *bio; 107 struct bio_vec *bv; 108 struct request *rq; 109 }; 110 111 enum frame_flags { 112 FFL_PROBE = 1, 113 }; 114 115 struct frame { 116 struct list_head head; 117 u32 tag; 118 struct timeval sent; /* high-res time packet was sent */ 119 u32 sent_jiffs; /* low-res jiffies-based sent time */ 120 ulong waited; 121 ulong waited_total; 122 struct aoetgt *t; /* parent target I belong to */ 123 sector_t lba; 124 struct sk_buff *skb; /* command skb freed on module exit */ 125 struct sk_buff *r_skb; /* response skb for async processing */ 126 struct buf *buf; 127 struct bio_vec *bv; 128 ulong bcnt; 129 ulong bv_off; 130 char flags; 131 }; 132 133 struct aoeif { 134 struct net_device *nd; 135 ulong lost; 136 int bcnt; 137 }; 138 139 struct aoetgt { 140 unsigned char addr[6]; 141 ushort nframes; /* cap on frames to use */ 142 struct aoedev *d; /* parent device I belong to */ 143 struct list_head ffree; /* list of free frames */ 144 struct aoeif ifs[NAOEIFS]; 145 struct aoeif *ifp; /* current aoeif in use */ 146 ushort nout; /* number of AoE commands outstanding */ 147 ushort maxout; /* current value for max outstanding */ 148 ushort next_cwnd; /* incr maxout after decrementing to zero */ 149 ushort ssthresh; /* slow start threshold */ 150 ulong falloc; /* number of allocated frames */ 151 int taint; /* how much we want to avoid this aoetgt */ 152 int minbcnt; 153 int wpkts, rpkts; 154 char nout_probes; 155 }; 156 157 struct aoedev { 158 struct aoedev *next; 159 ulong sysminor; 160 ulong aoemajor; 161 u32 rttavg; /* scaled AoE round trip time average */ 162 u32 rttdev; /* scaled round trip time mean deviation */ 163 u16 aoeminor; 164 u16 flags; 165 u16 nopen; /* (bd_openers isn't available without sleeping) */ 166 u16 fw_ver; /* version of blade's firmware */ 167 u16 lasttag; /* last tag sent */ 168 u16 useme; 169 ulong ref; 170 struct work_struct work;/* disk create work struct */ 171 struct gendisk *gd; 172 struct request_queue *blkq; 173 struct hd_geometry geo; 174 sector_t ssize; 175 struct timer_list timer; 176 spinlock_t lock; 177 struct sk_buff_head skbpool; 178 mempool_t *bufpool; /* for deadlock-free Buf allocation */ 179 struct { /* pointers to work in progress */ 180 struct buf *buf; 181 struct bio *nxbio; 182 struct request *rq; 183 } ip; 184 ulong maxbcnt; 185 struct list_head factive[NFACTIVE]; /* hash of active frames */ 186 struct list_head rexmitq; /* deferred retransmissions */ 187 struct aoetgt **targets; 188 ulong ntargets; /* number of allocated aoetgt pointers */ 189 struct aoetgt **tgt; /* target in use when working */ 190 ulong kicked; 191 char ident[512]; 192 }; 193 194 /* kthread tracking */ 195 struct ktstate { 196 struct completion rendez; 197 struct task_struct *task; 198 wait_queue_head_t *waitq; 199 int (*fn) (void); 200 char *name; 201 spinlock_t *lock; 202 }; 203 204 int aoeblk_init(void); 205 void aoeblk_exit(void); 206 void aoeblk_gdalloc(void *); 207 void aoedisk_rm_sysfs(struct aoedev *d); 208 209 int aoechr_init(void); 210 void aoechr_exit(void); 211 void aoechr_error(char *); 212 213 void aoecmd_work(struct aoedev *d); 214 void aoecmd_cfg(ushort aoemajor, unsigned char aoeminor); 215 struct sk_buff *aoecmd_ata_rsp(struct sk_buff *); 216 void aoecmd_cfg_rsp(struct sk_buff *); 217 void aoecmd_sleepwork(struct work_struct *); 218 void aoecmd_wreset(struct aoetgt *t); 219 void aoecmd_cleanslate(struct aoedev *); 220 void aoecmd_exit(void); 221 int aoecmd_init(void); 222 struct sk_buff *aoecmd_ata_id(struct aoedev *); 223 void aoe_freetframe(struct frame *); 224 void aoe_flush_iocq(void); 225 void aoe_end_request(struct aoedev *, struct request *, int); 226 int aoe_ktstart(struct ktstate *k); 227 void aoe_ktstop(struct ktstate *k); 228 229 int aoedev_init(void); 230 void aoedev_exit(void); 231 struct aoedev *aoedev_by_aoeaddr(ulong maj, int min, int do_alloc); 232 void aoedev_downdev(struct aoedev *d); 233 int aoedev_flush(const char __user *str, size_t size); 234 void aoe_failbuf(struct aoedev *, struct buf *); 235 void aoedev_put(struct aoedev *); 236 237 int aoenet_init(void); 238 void aoenet_exit(void); 239 void aoenet_xmit(struct sk_buff_head *); 240 int is_aoe_netif(struct net_device *ifp); 241 int set_aoe_iflist(const char __user *str, size_t size); 242