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Commit | Line | Data |
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ca47bbd9 | 1 | /* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */ |
1da177e4 LT |
2 | /* |
3 | * aoecmd.c | |
4 | * Filesystem request handling methods | |
5 | */ | |
6 | ||
04b3ab52 | 7 | #include <linux/ata.h> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
1da177e4 LT |
9 | #include <linux/hdreg.h> |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/netdevice.h> | |
3ae1c24e | 13 | #include <linux/genhd.h> |
68e0d42f | 14 | #include <linux/moduleparam.h> |
896831f5 EC |
15 | #include <linux/workqueue.h> |
16 | #include <linux/kthread.h> | |
881d966b | 17 | #include <net/net_namespace.h> |
475172fb | 18 | #include <asm/unaligned.h> |
896831f5 | 19 | #include <linux/uio.h> |
1da177e4 LT |
20 | #include "aoe.h" |
21 | ||
896831f5 EC |
22 | #define MAXIOC (8192) /* default meant to avoid most soft lockups */ |
23 | ||
24 | static void ktcomplete(struct frame *, struct sk_buff *); | |
bbb44e30 | 25 | static int count_targets(struct aoedev *d, int *untainted); |
896831f5 | 26 | |
69cf2d85 EC |
27 | static struct buf *nextbuf(struct aoedev *); |
28 | ||
b751e8b6 EC |
29 | static int aoe_deadsecs = 60 * 3; |
30 | module_param(aoe_deadsecs, int, 0644); | |
31 | MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev."); | |
1da177e4 | 32 | |
7b6ccc5f | 33 | static int aoe_maxout = 64; |
7df620d8 EC |
34 | module_param(aoe_maxout, int, 0644); |
35 | MODULE_PARM_DESC(aoe_maxout, | |
36 | "Only aoe_maxout outstanding packets for every MAC on eX.Y."); | |
37 | ||
8030d343 EC |
38 | /* The number of online cpus during module initialization gives us a |
39 | * convenient heuristic cap on the parallelism used for ktio threads | |
40 | * doing I/O completion. It is not important that the cap equal the | |
41 | * actual number of running CPUs at any given time, but because of CPU | |
42 | * hotplug, we take care to use ncpus instead of using | |
43 | * num_online_cpus() after module initialization. | |
44 | */ | |
45 | static int ncpus; | |
46 | ||
47 | /* mutex lock used for synchronization while thread spawning */ | |
48 | static DEFINE_MUTEX(ktio_spawn_lock); | |
49 | ||
50 | static wait_queue_head_t *ktiowq; | |
51 | static struct ktstate *kts; | |
896831f5 EC |
52 | |
53 | /* io completion queue */ | |
8030d343 | 54 | struct iocq_ktio { |
896831f5 EC |
55 | struct list_head head; |
56 | spinlock_t lock; | |
8030d343 EC |
57 | }; |
58 | static struct iocq_ktio *iocq; | |
896831f5 | 59 | |
bbb44e30 EC |
60 | static struct page *empty_page; |
61 | ||
68e0d42f | 62 | static struct sk_buff * |
e407a7f6 | 63 | new_skb(ulong len) |
1da177e4 LT |
64 | { |
65 | struct sk_buff *skb; | |
66 | ||
91c57464 | 67 | skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC); |
1da177e4 | 68 | if (skb) { |
91c57464 | 69 | skb_reserve(skb, MAX_HEADER); |
459a98ed | 70 | skb_reset_mac_header(skb); |
c1d2bbe1 | 71 | skb_reset_network_header(skb); |
1da177e4 | 72 | skb->protocol = __constant_htons(ETH_P_AOE); |
8babe8cc | 73 | skb_checksum_none_assert(skb); |
1da177e4 LT |
74 | } |
75 | return skb; | |
76 | } | |
77 | ||
3a0c40d2 EC |
78 | static struct frame * |
79 | getframe_deferred(struct aoedev *d, u32 tag) | |
80 | { | |
81 | struct list_head *head, *pos, *nx; | |
82 | struct frame *f; | |
83 | ||
84 | head = &d->rexmitq; | |
85 | list_for_each_safe(pos, nx, head) { | |
86 | f = list_entry(pos, struct frame, head); | |
87 | if (f->tag == tag) { | |
88 | list_del(pos); | |
89 | return f; | |
90 | } | |
91 | } | |
92 | return NULL; | |
93 | } | |
94 | ||
1da177e4 | 95 | static struct frame * |
64a80f5a | 96 | getframe(struct aoedev *d, u32 tag) |
1da177e4 | 97 | { |
896831f5 EC |
98 | struct frame *f; |
99 | struct list_head *head, *pos, *nx; | |
100 | u32 n; | |
1da177e4 | 101 | |
896831f5 | 102 | n = tag % NFACTIVE; |
64a80f5a | 103 | head = &d->factive[n]; |
896831f5 EC |
104 | list_for_each_safe(pos, nx, head) { |
105 | f = list_entry(pos, struct frame, head); | |
106 | if (f->tag == tag) { | |
107 | list_del(pos); | |
1da177e4 | 108 | return f; |
896831f5 EC |
109 | } |
110 | } | |
1da177e4 LT |
111 | return NULL; |
112 | } | |
113 | ||
114 | /* | |
115 | * Leave the top bit clear so we have tagspace for userland. | |
116 | * The bottom 16 bits are the xmit tick for rexmit/rttavg processing. | |
117 | * This driver reserves tag -1 to mean "unused frame." | |
118 | */ | |
119 | static int | |
64a80f5a | 120 | newtag(struct aoedev *d) |
1da177e4 LT |
121 | { |
122 | register ulong n; | |
123 | ||
124 | n = jiffies & 0xffff; | |
64a80f5a | 125 | return n |= (++d->lasttag & 0x7fff) << 16; |
1da177e4 LT |
126 | } |
127 | ||
896831f5 | 128 | static u32 |
68e0d42f | 129 | aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h) |
1da177e4 | 130 | { |
64a80f5a | 131 | u32 host_tag = newtag(d); |
1da177e4 | 132 | |
68e0d42f EC |
133 | memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); |
134 | memcpy(h->dst, t->addr, sizeof h->dst); | |
63e9cc5d | 135 | h->type = __constant_cpu_to_be16(ETH_P_AOE); |
1da177e4 | 136 | h->verfl = AOE_HVER; |
63e9cc5d | 137 | h->major = cpu_to_be16(d->aoemajor); |
1da177e4 LT |
138 | h->minor = d->aoeminor; |
139 | h->cmd = AOECMD_ATA; | |
63e9cc5d | 140 | h->tag = cpu_to_be32(host_tag); |
1da177e4 LT |
141 | |
142 | return host_tag; | |
143 | } | |
144 | ||
19bf2635 EC |
145 | static inline void |
146 | put_lba(struct aoe_atahdr *ah, sector_t lba) | |
147 | { | |
148 | ah->lba0 = lba; | |
149 | ah->lba1 = lba >>= 8; | |
150 | ah->lba2 = lba >>= 8; | |
151 | ah->lba3 = lba >>= 8; | |
152 | ah->lba4 = lba >>= 8; | |
153 | ah->lba5 = lba >>= 8; | |
154 | } | |
155 | ||
3f0f0133 | 156 | static struct aoeif * |
68e0d42f EC |
157 | ifrotate(struct aoetgt *t) |
158 | { | |
3f0f0133 EC |
159 | struct aoeif *ifp; |
160 | ||
161 | ifp = t->ifp; | |
162 | ifp++; | |
163 | if (ifp >= &t->ifs[NAOEIFS] || ifp->nd == NULL) | |
164 | ifp = t->ifs; | |
165 | if (ifp->nd == NULL) | |
166 | return NULL; | |
167 | return t->ifp = ifp; | |
68e0d42f EC |
168 | } |
169 | ||
9bb237b6 EC |
170 | static void |
171 | skb_pool_put(struct aoedev *d, struct sk_buff *skb) | |
172 | { | |
e9bb8fb0 | 173 | __skb_queue_tail(&d->skbpool, skb); |
9bb237b6 EC |
174 | } |
175 | ||
176 | static struct sk_buff * | |
177 | skb_pool_get(struct aoedev *d) | |
178 | { | |
e9bb8fb0 | 179 | struct sk_buff *skb = skb_peek(&d->skbpool); |
9bb237b6 | 180 | |
9bb237b6 | 181 | if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) { |
e9bb8fb0 | 182 | __skb_unlink(skb, &d->skbpool); |
9bb237b6 EC |
183 | return skb; |
184 | } | |
e9bb8fb0 DM |
185 | if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX && |
186 | (skb = new_skb(ETH_ZLEN))) | |
9bb237b6 | 187 | return skb; |
e9bb8fb0 | 188 | |
9bb237b6 EC |
189 | return NULL; |
190 | } | |
191 | ||
896831f5 EC |
192 | void |
193 | aoe_freetframe(struct frame *f) | |
194 | { | |
195 | struct aoetgt *t; | |
196 | ||
197 | t = f->t; | |
198 | f->buf = NULL; | |
feb261e2 | 199 | memset(&f->iter, 0, sizeof(f->iter)); |
896831f5 | 200 | f->r_skb = NULL; |
bbb44e30 | 201 | f->flags = 0; |
896831f5 EC |
202 | list_add(&f->head, &t->ffree); |
203 | } | |
204 | ||
68e0d42f | 205 | static struct frame * |
896831f5 | 206 | newtframe(struct aoedev *d, struct aoetgt *t) |
1da177e4 | 207 | { |
896831f5 | 208 | struct frame *f; |
9bb237b6 | 209 | struct sk_buff *skb; |
896831f5 EC |
210 | struct list_head *pos; |
211 | ||
212 | if (list_empty(&t->ffree)) { | |
213 | if (t->falloc >= NSKBPOOLMAX*2) | |
214 | return NULL; | |
215 | f = kcalloc(1, sizeof(*f), GFP_ATOMIC); | |
216 | if (f == NULL) | |
217 | return NULL; | |
218 | t->falloc++; | |
219 | f->t = t; | |
220 | } else { | |
221 | pos = t->ffree.next; | |
222 | list_del(pos); | |
223 | f = list_entry(pos, struct frame, head); | |
224 | } | |
225 | ||
226 | skb = f->skb; | |
227 | if (skb == NULL) { | |
228 | f->skb = skb = new_skb(ETH_ZLEN); | |
229 | if (!skb) { | |
230 | bail: aoe_freetframe(f); | |
231 | return NULL; | |
232 | } | |
233 | } | |
234 | ||
235 | if (atomic_read(&skb_shinfo(skb)->dataref) != 1) { | |
236 | skb = skb_pool_get(d); | |
237 | if (skb == NULL) | |
238 | goto bail; | |
239 | skb_pool_put(d, f->skb); | |
240 | f->skb = skb; | |
241 | } | |
242 | ||
243 | skb->truesize -= skb->data_len; | |
244 | skb_shinfo(skb)->nr_frags = skb->data_len = 0; | |
245 | skb_trim(skb, 0); | |
246 | return f; | |
247 | } | |
248 | ||
249 | static struct frame * | |
250 | newframe(struct aoedev *d) | |
251 | { | |
252 | struct frame *f; | |
253 | struct aoetgt *t, **tt; | |
254 | int totout = 0; | |
bbb44e30 EC |
255 | int use_tainted; |
256 | int has_untainted; | |
68e0d42f | 257 | |
71114ec4 | 258 | if (!d->targets || !d->targets[0]) { |
68e0d42f EC |
259 | printk(KERN_ERR "aoe: NULL TARGETS!\n"); |
260 | return NULL; | |
261 | } | |
896831f5 | 262 | tt = d->tgt; /* last used target */ |
bbb44e30 | 263 | for (use_tainted = 0, has_untainted = 0;;) { |
896831f5 | 264 | tt++; |
71114ec4 | 265 | if (tt >= &d->targets[d->ntargets] || !*tt) |
896831f5 EC |
266 | tt = d->targets; |
267 | t = *tt; | |
bbb44e30 EC |
268 | if (!t->taint) { |
269 | has_untainted = 1; | |
270 | totout += t->nout; | |
271 | } | |
896831f5 | 272 | if (t->nout < t->maxout |
bbb44e30 | 273 | && (use_tainted || !t->taint) |
896831f5 EC |
274 | && t->ifp->nd) { |
275 | f = newtframe(d, t); | |
276 | if (f) { | |
896831f5 | 277 | ifrotate(t); |
3f0f0133 | 278 | d->tgt = tt; |
68e0d42f EC |
279 | return f; |
280 | } | |
68e0d42f | 281 | } |
bbb44e30 EC |
282 | if (tt == d->tgt) { /* we've looped and found nada */ |
283 | if (!use_tainted && !has_untainted) | |
284 | use_tainted = 1; | |
285 | else | |
286 | break; | |
287 | } | |
896831f5 EC |
288 | } |
289 | if (totout == 0) { | |
290 | d->kicked++; | |
291 | d->flags |= DEVFL_KICKME; | |
9bb237b6 | 292 | } |
68e0d42f EC |
293 | return NULL; |
294 | } | |
295 | ||
3d5b0605 | 296 | static void |
feb261e2 | 297 | skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter) |
3d5b0605 EC |
298 | { |
299 | int frag = 0; | |
feb261e2 KO |
300 | struct bio_vec bv; |
301 | ||
302 | __bio_for_each_segment(bv, bio, iter, iter) | |
303 | skb_fill_page_desc(skb, frag++, bv.bv_page, | |
304 | bv.bv_offset, bv.bv_len); | |
3d5b0605 EC |
305 | } |
306 | ||
896831f5 EC |
307 | static void |
308 | fhash(struct frame *f) | |
309 | { | |
64a80f5a | 310 | struct aoedev *d = f->t->d; |
896831f5 EC |
311 | u32 n; |
312 | ||
313 | n = f->tag % NFACTIVE; | |
64a80f5a | 314 | list_add_tail(&f->head, &d->factive[n]); |
896831f5 EC |
315 | } |
316 | ||
bbb44e30 EC |
317 | static void |
318 | ata_rw_frameinit(struct frame *f) | |
319 | { | |
320 | struct aoetgt *t; | |
321 | struct aoe_hdr *h; | |
322 | struct aoe_atahdr *ah; | |
323 | struct sk_buff *skb; | |
324 | char writebit, extbit; | |
325 | ||
326 | skb = f->skb; | |
327 | h = (struct aoe_hdr *) skb_mac_header(skb); | |
328 | ah = (struct aoe_atahdr *) (h + 1); | |
329 | skb_put(skb, sizeof(*h) + sizeof(*ah)); | |
330 | memset(h, 0, skb->len); | |
331 | ||
332 | writebit = 0x10; | |
333 | extbit = 0x4; | |
334 | ||
335 | t = f->t; | |
336 | f->tag = aoehdr_atainit(t->d, t, h); | |
337 | fhash(f); | |
338 | t->nout++; | |
339 | f->waited = 0; | |
340 | f->waited_total = 0; | |
bbb44e30 EC |
341 | |
342 | /* set up ata header */ | |
feb261e2 KO |
343 | ah->scnt = f->iter.bi_size >> 9; |
344 | put_lba(ah, f->iter.bi_sector); | |
bbb44e30 EC |
345 | if (t->d->flags & DEVFL_EXT) { |
346 | ah->aflags |= AOEAFL_EXT; | |
347 | } else { | |
348 | extbit = 0; | |
349 | ah->lba3 &= 0x0f; | |
350 | ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */ | |
351 | } | |
352 | if (f->buf && bio_data_dir(f->buf->bio) == WRITE) { | |
feb261e2 | 353 | skb_fillup(skb, f->buf->bio, f->iter); |
bbb44e30 | 354 | ah->aflags |= AOEAFL_WRITE; |
feb261e2 KO |
355 | skb->len += f->iter.bi_size; |
356 | skb->data_len = f->iter.bi_size; | |
357 | skb->truesize += f->iter.bi_size; | |
bbb44e30 EC |
358 | t->wpkts++; |
359 | } else { | |
360 | t->rpkts++; | |
361 | writebit = 0; | |
362 | } | |
363 | ||
364 | ah->cmdstat = ATA_CMD_PIO_READ | writebit | extbit; | |
365 | skb->dev = t->ifp->nd; | |
366 | } | |
367 | ||
68e0d42f EC |
368 | static int |
369 | aoecmd_ata_rw(struct aoedev *d) | |
370 | { | |
371 | struct frame *f; | |
1da177e4 LT |
372 | struct buf *buf; |
373 | struct sk_buff *skb; | |
69cf2d85 | 374 | struct sk_buff_head queue; |
1da177e4 | 375 | |
69cf2d85 EC |
376 | buf = nextbuf(d); |
377 | if (buf == NULL) | |
378 | return 0; | |
896831f5 | 379 | f = newframe(d); |
68e0d42f EC |
380 | if (f == NULL) |
381 | return 0; | |
3d5b0605 | 382 | |
1da177e4 | 383 | /* initialize the headers & frame */ |
1da177e4 | 384 | f->buf = buf; |
feb261e2 KO |
385 | f->iter = buf->iter; |
386 | f->iter.bi_size = min_t(unsigned long, | |
387 | d->maxbcnt ?: DEFAULTBCNT, | |
388 | f->iter.bi_size); | |
389 | bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size); | |
390 | ||
391 | if (!buf->iter.bi_size) | |
392 | d->ip.buf = NULL; | |
1da177e4 LT |
393 | |
394 | /* mark all tracking fields and load out */ | |
395 | buf->nframesout += 1; | |
feb261e2 KO |
396 | |
397 | ata_rw_frameinit(f); | |
1da177e4 | 398 | |
bbb44e30 | 399 | skb = skb_clone(f->skb, GFP_ATOMIC); |
69cf2d85 | 400 | if (skb) { |
5f0c9c48 EC |
401 | do_gettimeofday(&f->sent); |
402 | f->sent_jiffs = (u32) jiffies; | |
69cf2d85 EC |
403 | __skb_queue_head_init(&queue); |
404 | __skb_queue_tail(&queue, skb); | |
405 | aoenet_xmit(&queue); | |
406 | } | |
68e0d42f | 407 | return 1; |
1da177e4 LT |
408 | } |
409 | ||
3ae1c24e EC |
410 | /* some callers cannot sleep, and they can call this function, |
411 | * transmitting the packets later, when interrupts are on | |
412 | */ | |
e9bb8fb0 DM |
413 | static void |
414 | aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue) | |
3ae1c24e EC |
415 | { |
416 | struct aoe_hdr *h; | |
417 | struct aoe_cfghdr *ch; | |
e9bb8fb0 | 418 | struct sk_buff *skb; |
3ae1c24e EC |
419 | struct net_device *ifp; |
420 | ||
840a185d ED |
421 | rcu_read_lock(); |
422 | for_each_netdev_rcu(&init_net, ifp) { | |
3ae1c24e EC |
423 | dev_hold(ifp); |
424 | if (!is_aoe_netif(ifp)) | |
7562f876 | 425 | goto cont; |
3ae1c24e | 426 | |
e407a7f6 | 427 | skb = new_skb(sizeof *h + sizeof *ch); |
3ae1c24e | 428 | if (skb == NULL) { |
a12c93f0 | 429 | printk(KERN_INFO "aoe: skb alloc failure\n"); |
7562f876 | 430 | goto cont; |
3ae1c24e | 431 | } |
19900cde | 432 | skb_put(skb, sizeof *h + sizeof *ch); |
e407a7f6 | 433 | skb->dev = ifp; |
e9bb8fb0 | 434 | __skb_queue_tail(queue, skb); |
abdbf94d | 435 | h = (struct aoe_hdr *) skb_mac_header(skb); |
3ae1c24e EC |
436 | memset(h, 0, sizeof *h + sizeof *ch); |
437 | ||
438 | memset(h->dst, 0xff, sizeof h->dst); | |
439 | memcpy(h->src, ifp->dev_addr, sizeof h->src); | |
440 | h->type = __constant_cpu_to_be16(ETH_P_AOE); | |
441 | h->verfl = AOE_HVER; | |
442 | h->major = cpu_to_be16(aoemajor); | |
443 | h->minor = aoeminor; | |
444 | h->cmd = AOECMD_CFG; | |
445 | ||
7562f876 PE |
446 | cont: |
447 | dev_put(ifp); | |
3ae1c24e | 448 | } |
840a185d | 449 | rcu_read_unlock(); |
3ae1c24e EC |
450 | } |
451 | ||
1da177e4 | 452 | static void |
896831f5 | 453 | resend(struct aoedev *d, struct frame *f) |
1da177e4 LT |
454 | { |
455 | struct sk_buff *skb; | |
69cf2d85 | 456 | struct sk_buff_head queue; |
1da177e4 | 457 | struct aoe_hdr *h; |
896831f5 | 458 | struct aoetgt *t; |
1da177e4 LT |
459 | char buf[128]; |
460 | u32 n; | |
1da177e4 | 461 | |
896831f5 | 462 | t = f->t; |
64a80f5a | 463 | n = newtag(d); |
68e0d42f | 464 | skb = f->skb; |
3f0f0133 EC |
465 | if (ifrotate(t) == NULL) { |
466 | /* probably can't happen, but set it up to fail anyway */ | |
467 | pr_info("aoe: resend: no interfaces to rotate to.\n"); | |
468 | ktcomplete(f, NULL); | |
469 | return; | |
470 | } | |
68e0d42f | 471 | h = (struct aoe_hdr *) skb_mac_header(skb); |
1da177e4 | 472 | |
bbb44e30 EC |
473 | if (!(f->flags & FFL_PROBE)) { |
474 | snprintf(buf, sizeof(buf), | |
475 | "%15s e%ld.%d oldtag=%08x@%08lx newtag=%08x s=%pm d=%pm nout=%d\n", | |
476 | "retransmit", d->aoemajor, d->aoeminor, | |
477 | f->tag, jiffies, n, | |
478 | h->src, h->dst, t->nout); | |
479 | aoechr_error(buf); | |
480 | } | |
1da177e4 | 481 | |
1da177e4 | 482 | f->tag = n; |
896831f5 | 483 | fhash(f); |
63e9cc5d | 484 | h->tag = cpu_to_be32(n); |
68e0d42f EC |
485 | memcpy(h->dst, t->addr, sizeof h->dst); |
486 | memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src); | |
487 | ||
68e0d42f | 488 | skb->dev = t->ifp->nd; |
4f51dc5e EC |
489 | skb = skb_clone(skb, GFP_ATOMIC); |
490 | if (skb == NULL) | |
491 | return; | |
5f0c9c48 EC |
492 | do_gettimeofday(&f->sent); |
493 | f->sent_jiffs = (u32) jiffies; | |
69cf2d85 EC |
494 | __skb_queue_head_init(&queue); |
495 | __skb_queue_tail(&queue, skb); | |
496 | aoenet_xmit(&queue); | |
1da177e4 LT |
497 | } |
498 | ||
5f0c9c48 EC |
499 | static int |
500 | tsince_hr(struct frame *f) | |
501 | { | |
502 | struct timeval now; | |
503 | int n; | |
504 | ||
505 | do_gettimeofday(&now); | |
506 | n = now.tv_usec - f->sent.tv_usec; | |
507 | n += (now.tv_sec - f->sent.tv_sec) * USEC_PER_SEC; | |
508 | ||
509 | if (n < 0) | |
510 | n = -n; | |
511 | ||
512 | /* For relatively long periods, use jiffies to avoid | |
513 | * discrepancies caused by updates to the system time. | |
514 | * | |
515 | * On system with HZ of 1000, 32-bits is over 49 days | |
516 | * worth of jiffies, or over 71 minutes worth of usecs. | |
517 | * | |
518 | * Jiffies overflow is handled by subtraction of unsigned ints: | |
519 | * (gdb) print (unsigned) 2 - (unsigned) 0xfffffffe | |
520 | * $3 = 4 | |
521 | * (gdb) | |
522 | */ | |
523 | if (n > USEC_PER_SEC / 4) { | |
524 | n = ((u32) jiffies) - f->sent_jiffs; | |
525 | n *= USEC_PER_SEC / HZ; | |
526 | } | |
527 | ||
528 | return n; | |
529 | } | |
530 | ||
1da177e4 | 531 | static int |
896831f5 | 532 | tsince(u32 tag) |
1da177e4 LT |
533 | { |
534 | int n; | |
535 | ||
536 | n = jiffies & 0xffff; | |
537 | n -= tag & 0xffff; | |
538 | if (n < 0) | |
539 | n += 1<<16; | |
5f0c9c48 | 540 | return jiffies_to_usecs(n + 1); |
1da177e4 LT |
541 | } |
542 | ||
68e0d42f EC |
543 | static struct aoeif * |
544 | getif(struct aoetgt *t, struct net_device *nd) | |
545 | { | |
546 | struct aoeif *p, *e; | |
547 | ||
548 | p = t->ifs; | |
549 | e = p + NAOEIFS; | |
550 | for (; p < e; p++) | |
551 | if (p->nd == nd) | |
552 | return p; | |
553 | return NULL; | |
554 | } | |
555 | ||
68e0d42f EC |
556 | static void |
557 | ejectif(struct aoetgt *t, struct aoeif *ifp) | |
558 | { | |
559 | struct aoeif *e; | |
1b86fda9 | 560 | struct net_device *nd; |
68e0d42f EC |
561 | ulong n; |
562 | ||
1b86fda9 | 563 | nd = ifp->nd; |
68e0d42f EC |
564 | e = t->ifs + NAOEIFS - 1; |
565 | n = (e - ifp) * sizeof *ifp; | |
566 | memmove(ifp, ifp+1, n); | |
567 | e->nd = NULL; | |
1b86fda9 | 568 | dev_put(nd); |
68e0d42f EC |
569 | } |
570 | ||
3fc9b032 | 571 | static struct frame * |
bbb44e30 | 572 | reassign_frame(struct frame *f) |
3fc9b032 | 573 | { |
3fc9b032 EC |
574 | struct frame *nf; |
575 | struct sk_buff *skb; | |
576 | ||
3fc9b032 EC |
577 | nf = newframe(f->t->d); |
578 | if (!nf) | |
579 | return NULL; | |
bbb44e30 EC |
580 | if (nf->t == f->t) { |
581 | aoe_freetframe(nf); | |
582 | return NULL; | |
583 | } | |
3fc9b032 EC |
584 | |
585 | skb = nf->skb; | |
586 | nf->skb = f->skb; | |
587 | nf->buf = f->buf; | |
feb261e2 | 588 | nf->iter = f->iter; |
3fc9b032 EC |
589 | nf->waited = 0; |
590 | nf->waited_total = f->waited_total; | |
591 | nf->sent = f->sent; | |
fe7252bf | 592 | nf->sent_jiffs = f->sent_jiffs; |
3fc9b032 | 593 | f->skb = skb; |
3fc9b032 EC |
594 | |
595 | return nf; | |
596 | } | |
597 | ||
bbb44e30 EC |
598 | static void |
599 | probe(struct aoetgt *t) | |
68e0d42f | 600 | { |
bbb44e30 EC |
601 | struct aoedev *d; |
602 | struct frame *f; | |
603 | struct sk_buff *skb; | |
604 | struct sk_buff_head queue; | |
605 | size_t n, m; | |
606 | int frag; | |
896831f5 | 607 | |
bbb44e30 EC |
608 | d = t->d; |
609 | f = newtframe(d, t); | |
610 | if (!f) { | |
611 | pr_err("%s %pm for e%ld.%d: %s\n", | |
612 | "aoe: cannot probe remote address", | |
613 | t->addr, | |
614 | (long) d->aoemajor, d->aoeminor, | |
615 | "no frame available"); | |
616 | return; | |
68e0d42f | 617 | } |
bbb44e30 EC |
618 | f->flags |= FFL_PROBE; |
619 | ifrotate(t); | |
feb261e2 | 620 | f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT; |
bbb44e30 EC |
621 | ata_rw_frameinit(f); |
622 | skb = f->skb; | |
feb261e2 | 623 | for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) { |
bbb44e30 EC |
624 | if (n < PAGE_SIZE) |
625 | m = n; | |
626 | else | |
627 | m = PAGE_SIZE; | |
628 | skb_fill_page_desc(skb, frag, empty_page, 0, m); | |
3fc9b032 | 629 | } |
feb261e2 KO |
630 | skb->len += f->iter.bi_size; |
631 | skb->data_len = f->iter.bi_size; | |
632 | skb->truesize += f->iter.bi_size; | |
bbb44e30 EC |
633 | |
634 | skb = skb_clone(f->skb, GFP_ATOMIC); | |
635 | if (skb) { | |
636 | do_gettimeofday(&f->sent); | |
637 | f->sent_jiffs = (u32) jiffies; | |
638 | __skb_queue_head_init(&queue); | |
639 | __skb_queue_tail(&queue, skb); | |
640 | aoenet_xmit(&queue); | |
641 | } | |
642 | } | |
643 | ||
644 | static long | |
645 | rto(struct aoedev *d) | |
646 | { | |
647 | long t; | |
648 | ||
649 | t = 2 * d->rttavg >> RTTSCALE; | |
650 | t += 8 * d->rttdev >> RTTDSCALE; | |
651 | if (t == 0) | |
652 | t = 1; | |
653 | ||
654 | return t; | |
68e0d42f EC |
655 | } |
656 | ||
3a0c40d2 EC |
657 | static void |
658 | rexmit_deferred(struct aoedev *d) | |
659 | { | |
660 | struct aoetgt *t; | |
661 | struct frame *f; | |
bbb44e30 | 662 | struct frame *nf; |
3a0c40d2 | 663 | struct list_head *pos, *nx, *head; |
3fc9b032 | 664 | int since; |
bbb44e30 EC |
665 | int untainted; |
666 | ||
667 | count_targets(d, &untainted); | |
3a0c40d2 EC |
668 | |
669 | head = &d->rexmitq; | |
670 | list_for_each_safe(pos, nx, head) { | |
671 | f = list_entry(pos, struct frame, head); | |
672 | t = f->t; | |
bbb44e30 EC |
673 | if (t->taint) { |
674 | if (!(f->flags & FFL_PROBE)) { | |
675 | nf = reassign_frame(f); | |
676 | if (nf) { | |
677 | if (t->nout_probes == 0 | |
678 | && untainted > 0) { | |
679 | probe(t); | |
680 | t->nout_probes++; | |
681 | } | |
682 | list_replace(&f->head, &nf->head); | |
683 | pos = &nf->head; | |
684 | aoe_freetframe(f); | |
685 | f = nf; | |
686 | t = f->t; | |
687 | } | |
688 | } else if (untainted < 1) { | |
689 | /* don't probe w/o other untainted aoetgts */ | |
690 | goto stop_probe; | |
691 | } else if (tsince_hr(f) < t->taint * rto(d)) { | |
692 | /* reprobe slowly when taint is high */ | |
693 | continue; | |
694 | } | |
695 | } else if (f->flags & FFL_PROBE) { | |
696 | stop_probe: /* don't probe untainted aoetgts */ | |
697 | list_del(pos); | |
698 | aoe_freetframe(f); | |
699 | /* leaving d->kicked, because this is routine */ | |
700 | f->t->d->flags |= DEVFL_KICKME; | |
701 | continue; | |
702 | } | |
3a0c40d2 EC |
703 | if (t->nout >= t->maxout) |
704 | continue; | |
705 | list_del(pos); | |
706 | t->nout++; | |
bbb44e30 EC |
707 | if (f->flags & FFL_PROBE) |
708 | t->nout_probes++; | |
3fc9b032 EC |
709 | since = tsince_hr(f); |
710 | f->waited += since; | |
711 | f->waited_total += since; | |
3a0c40d2 EC |
712 | resend(d, f); |
713 | } | |
714 | } | |
715 | ||
bbb44e30 EC |
716 | /* An aoetgt accumulates demerits quickly, and successful |
717 | * probing redeems the aoetgt slowly. | |
718 | */ | |
719 | static void | |
720 | scorn(struct aoetgt *t) | |
721 | { | |
722 | int n; | |
723 | ||
724 | n = t->taint++; | |
725 | t->taint += t->taint * 2; | |
726 | if (n > t->taint) | |
727 | t->taint = n; | |
728 | if (t->taint > MAX_TAINT) | |
729 | t->taint = MAX_TAINT; | |
730 | } | |
731 | ||
732 | static int | |
733 | count_targets(struct aoedev *d, int *untainted) | |
734 | { | |
735 | int i, good; | |
736 | ||
737 | for (i = good = 0; i < d->ntargets && d->targets[i]; ++i) | |
738 | if (d->targets[i]->taint == 0) | |
739 | good++; | |
740 | ||
741 | if (untainted) | |
742 | *untainted = good; | |
743 | return i; | |
744 | } | |
745 | ||
1da177e4 LT |
746 | static void |
747 | rexmit_timer(ulong vp) | |
748 | { | |
749 | struct aoedev *d; | |
3a0c40d2 | 750 | struct aoetgt *t; |
68e0d42f | 751 | struct aoeif *ifp; |
896831f5 EC |
752 | struct frame *f; |
753 | struct list_head *head, *pos, *nx; | |
754 | LIST_HEAD(flist); | |
1da177e4 LT |
755 | register long timeout; |
756 | ulong flags, n; | |
896831f5 | 757 | int i; |
bbb44e30 | 758 | int utgts; /* number of aoetgt descriptors (not slots) */ |
3fc9b032 | 759 | int since; |
1da177e4 LT |
760 | |
761 | d = (struct aoedev *) vp; | |
1da177e4 | 762 | |
0d555ecf EC |
763 | spin_lock_irqsave(&d->lock, flags); |
764 | ||
3a0c40d2 | 765 | /* timeout based on observed timings and variations */ |
bbb44e30 EC |
766 | timeout = rto(d); |
767 | ||
768 | utgts = count_targets(d, NULL); | |
1da177e4 | 769 | |
1da177e4 | 770 | if (d->flags & DEVFL_TKILL) { |
1c6f3fca | 771 | spin_unlock_irqrestore(&d->lock, flags); |
1da177e4 LT |
772 | return; |
773 | } | |
896831f5 EC |
774 | |
775 | /* collect all frames to rexmit into flist */ | |
64a80f5a EC |
776 | for (i = 0; i < NFACTIVE; i++) { |
777 | head = &d->factive[i]; | |
778 | list_for_each_safe(pos, nx, head) { | |
779 | f = list_entry(pos, struct frame, head); | |
5f0c9c48 | 780 | if (tsince_hr(f) < timeout) |
64a80f5a EC |
781 | break; /* end of expired frames */ |
782 | /* move to flist for later processing */ | |
783 | list_move_tail(pos, &flist); | |
68e0d42f | 784 | } |
64a80f5a | 785 | } |
69cf2d85 | 786 | |
896831f5 EC |
787 | /* process expired frames */ |
788 | while (!list_empty(&flist)) { | |
789 | pos = flist.next; | |
790 | f = list_entry(pos, struct frame, head); | |
3fc9b032 EC |
791 | since = tsince_hr(f); |
792 | n = f->waited_total + since; | |
5f0c9c48 | 793 | n /= USEC_PER_SEC; |
c450ba0f EC |
794 | if (aoe_deadsecs |
795 | && n > aoe_deadsecs | |
796 | && !(f->flags & FFL_PROBE)) { | |
896831f5 EC |
797 | /* Waited too long. Device failure. |
798 | * Hang all frames on first hash bucket for downdev | |
799 | * to clean up. | |
800 | */ | |
64a80f5a | 801 | list_splice(&flist, &d->factive[0]); |
896831f5 | 802 | aoedev_downdev(d); |
3a0c40d2 | 803 | goto out; |
896831f5 | 804 | } |
896831f5 EC |
805 | |
806 | t = f->t; | |
bbb44e30 EC |
807 | n = f->waited + since; |
808 | n /= USEC_PER_SEC; | |
809 | if (aoe_deadsecs && utgts > 0 | |
810 | && (n > aoe_deadsecs / utgts || n > HARD_SCORN_SECS)) | |
811 | scorn(t); /* avoid this target */ | |
d54d35ac | 812 | |
3a0c40d2 EC |
813 | if (t->maxout != 1) { |
814 | t->ssthresh = t->maxout / 2; | |
815 | t->maxout = 1; | |
896831f5 EC |
816 | } |
817 | ||
bbb44e30 EC |
818 | if (f->flags & FFL_PROBE) { |
819 | t->nout_probes--; | |
820 | } else { | |
821 | ifp = getif(t, f->skb->dev); | |
822 | if (ifp && ++ifp->lost > (t->nframes << 1) | |
823 | && (ifp != t->ifs || t->ifs[1].nd)) { | |
824 | ejectif(t, ifp); | |
825 | ifp = NULL; | |
826 | } | |
896831f5 | 827 | } |
3a0c40d2 EC |
828 | list_move_tail(pos, &d->rexmitq); |
829 | t->nout--; | |
896831f5 | 830 | } |
3a0c40d2 | 831 | rexmit_deferred(d); |
896831f5 | 832 | |
3a0c40d2 | 833 | out: |
bbb44e30 | 834 | if ((d->flags & DEVFL_KICKME) && d->blkq) { |
4f51dc5e | 835 | d->flags &= ~DEVFL_KICKME; |
69cf2d85 | 836 | d->blkq->request_fn(d->blkq); |
4f51dc5e | 837 | } |
1da177e4 | 838 | |
1da177e4 LT |
839 | d->timer.expires = jiffies + TIMERTICK; |
840 | add_timer(&d->timer); | |
841 | ||
842 | spin_unlock_irqrestore(&d->lock, flags); | |
69cf2d85 | 843 | } |
1da177e4 | 844 | |
69cf2d85 EC |
845 | static unsigned long |
846 | rqbiocnt(struct request *r) | |
847 | { | |
848 | struct bio *bio; | |
849 | unsigned long n = 0; | |
850 | ||
851 | __rq_for_each_bio(bio, r) | |
852 | n++; | |
853 | return n; | |
854 | } | |
855 | ||
69cf2d85 EC |
856 | static void |
857 | bufinit(struct buf *buf, struct request *rq, struct bio *bio) | |
858 | { | |
69cf2d85 EC |
859 | memset(buf, 0, sizeof(*buf)); |
860 | buf->rq = rq; | |
861 | buf->bio = bio; | |
feb261e2 | 862 | buf->iter = bio->bi_iter; |
69cf2d85 EC |
863 | } |
864 | ||
865 | static struct buf * | |
866 | nextbuf(struct aoedev *d) | |
867 | { | |
868 | struct request *rq; | |
869 | struct request_queue *q; | |
870 | struct buf *buf; | |
871 | struct bio *bio; | |
872 | ||
873 | q = d->blkq; | |
874 | if (q == NULL) | |
875 | return NULL; /* initializing */ | |
876 | if (d->ip.buf) | |
877 | return d->ip.buf; | |
878 | rq = d->ip.rq; | |
879 | if (rq == NULL) { | |
880 | rq = blk_peek_request(q); | |
881 | if (rq == NULL) | |
882 | return NULL; | |
883 | blk_start_request(rq); | |
884 | d->ip.rq = rq; | |
885 | d->ip.nxbio = rq->bio; | |
886 | rq->special = (void *) rqbiocnt(rq); | |
887 | } | |
888 | buf = mempool_alloc(d->bufpool, GFP_ATOMIC); | |
889 | if (buf == NULL) { | |
890 | pr_err("aoe: nextbuf: unable to mempool_alloc!\n"); | |
891 | return NULL; | |
892 | } | |
893 | bio = d->ip.nxbio; | |
894 | bufinit(buf, rq, bio); | |
895 | bio = bio->bi_next; | |
896 | d->ip.nxbio = bio; | |
897 | if (bio == NULL) | |
898 | d->ip.rq = NULL; | |
899 | return d->ip.buf = buf; | |
1da177e4 LT |
900 | } |
901 | ||
68e0d42f EC |
902 | /* enters with d->lock held */ |
903 | void | |
904 | aoecmd_work(struct aoedev *d) | |
905 | { | |
3a0c40d2 | 906 | rexmit_deferred(d); |
69cf2d85 EC |
907 | while (aoecmd_ata_rw(d)) |
908 | ; | |
68e0d42f EC |
909 | } |
910 | ||
3ae1c24e EC |
911 | /* this function performs work that has been deferred until sleeping is OK |
912 | */ | |
913 | void | |
c4028958 | 914 | aoecmd_sleepwork(struct work_struct *work) |
3ae1c24e | 915 | { |
c4028958 | 916 | struct aoedev *d = container_of(work, struct aoedev, work); |
b21faa25 EC |
917 | struct block_device *bd; |
918 | u64 ssize; | |
3ae1c24e EC |
919 | |
920 | if (d->flags & DEVFL_GDALLOC) | |
921 | aoeblk_gdalloc(d); | |
922 | ||
923 | if (d->flags & DEVFL_NEWSIZE) { | |
80795aef | 924 | ssize = get_capacity(d->gd); |
3ae1c24e | 925 | bd = bdget_disk(d->gd, 0); |
3ae1c24e | 926 | if (bd) { |
5955102c | 927 | inode_lock(bd->bd_inode); |
3ae1c24e | 928 | i_size_write(bd->bd_inode, (loff_t)ssize<<9); |
5955102c | 929 | inode_unlock(bd->bd_inode); |
3ae1c24e EC |
930 | bdput(bd); |
931 | } | |
b21faa25 | 932 | spin_lock_irq(&d->lock); |
3ae1c24e EC |
933 | d->flags |= DEVFL_UP; |
934 | d->flags &= ~DEVFL_NEWSIZE; | |
b21faa25 | 935 | spin_unlock_irq(&d->lock); |
3ae1c24e EC |
936 | } |
937 | } | |
938 | ||
667be1e7 EC |
939 | static void |
940 | ata_ident_fixstring(u16 *id, int ns) | |
941 | { | |
942 | u16 s; | |
943 | ||
944 | while (ns-- > 0) { | |
945 | s = *id; | |
946 | *id++ = s >> 8 | s << 8; | |
947 | } | |
948 | } | |
949 | ||
1da177e4 | 950 | static void |
68e0d42f | 951 | ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id) |
1da177e4 LT |
952 | { |
953 | u64 ssize; | |
954 | u16 n; | |
955 | ||
956 | /* word 83: command set supported */ | |
f885f8d1 | 957 | n = get_unaligned_le16(&id[83 << 1]); |
1da177e4 LT |
958 | |
959 | /* word 86: command set/feature enabled */ | |
f885f8d1 | 960 | n |= get_unaligned_le16(&id[86 << 1]); |
1da177e4 LT |
961 | |
962 | if (n & (1<<10)) { /* bit 10: LBA 48 */ | |
963 | d->flags |= DEVFL_EXT; | |
964 | ||
965 | /* word 100: number lba48 sectors */ | |
f885f8d1 | 966 | ssize = get_unaligned_le64(&id[100 << 1]); |
1da177e4 LT |
967 | |
968 | /* set as in ide-disk.c:init_idedisk_capacity */ | |
969 | d->geo.cylinders = ssize; | |
970 | d->geo.cylinders /= (255 * 63); | |
971 | d->geo.heads = 255; | |
972 | d->geo.sectors = 63; | |
973 | } else { | |
974 | d->flags &= ~DEVFL_EXT; | |
975 | ||
976 | /* number lba28 sectors */ | |
f885f8d1 | 977 | ssize = get_unaligned_le32(&id[60 << 1]); |
1da177e4 LT |
978 | |
979 | /* NOTE: obsolete in ATA 6 */ | |
f885f8d1 HH |
980 | d->geo.cylinders = get_unaligned_le16(&id[54 << 1]); |
981 | d->geo.heads = get_unaligned_le16(&id[55 << 1]); | |
982 | d->geo.sectors = get_unaligned_le16(&id[56 << 1]); | |
1da177e4 | 983 | } |
3ae1c24e | 984 | |
667be1e7 EC |
985 | ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */ |
986 | ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */ | |
987 | ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */ | |
988 | memcpy(d->ident, id, sizeof(d->ident)); | |
989 | ||
3ae1c24e | 990 | if (d->ssize != ssize) |
1d75981a | 991 | printk(KERN_INFO |
411c41ee HH |
992 | "aoe: %pm e%ld.%d v%04x has %llu sectors\n", |
993 | t->addr, | |
3ae1c24e EC |
994 | d->aoemajor, d->aoeminor, |
995 | d->fw_ver, (long long)ssize); | |
1da177e4 LT |
996 | d->ssize = ssize; |
997 | d->geo.start = 0; | |
6b9699bb EC |
998 | if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE)) |
999 | return; | |
1da177e4 | 1000 | if (d->gd != NULL) { |
80795aef | 1001 | set_capacity(d->gd, ssize); |
3ae1c24e | 1002 | d->flags |= DEVFL_NEWSIZE; |
68e0d42f | 1003 | } else |
3ae1c24e | 1004 | d->flags |= DEVFL_GDALLOC; |
1da177e4 | 1005 | schedule_work(&d->work); |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | static void | |
3a0c40d2 | 1009 | calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt) |
1da177e4 LT |
1010 | { |
1011 | register long n; | |
1012 | ||
1013 | n = rtt; | |
3a0c40d2 EC |
1014 | |
1015 | /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */ | |
1016 | n -= d->rttavg >> RTTSCALE; | |
1017 | d->rttavg += n; | |
1018 | if (n < 0) | |
1019 | n = -n; | |
1020 | n -= d->rttdev >> RTTDSCALE; | |
1021 | d->rttdev += n; | |
1022 | ||
1023 | if (!t || t->maxout >= t->nframes) | |
1024 | return; | |
1025 | if (t->maxout < t->ssthresh) | |
1026 | t->maxout += 1; | |
1027 | else if (t->nout == t->maxout && t->next_cwnd-- == 0) { | |
1028 | t->maxout += 1; | |
1029 | t->next_cwnd = t->maxout; | |
1030 | } | |
1da177e4 LT |
1031 | } |
1032 | ||
68e0d42f EC |
1033 | static struct aoetgt * |
1034 | gettgt(struct aoedev *d, char *addr) | |
1035 | { | |
1036 | struct aoetgt **t, **e; | |
1037 | ||
1038 | t = d->targets; | |
71114ec4 | 1039 | e = t + d->ntargets; |
68e0d42f EC |
1040 | for (; t < e && *t; t++) |
1041 | if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0) | |
1042 | return *t; | |
1043 | return NULL; | |
1044 | } | |
1045 | ||
3d5b0605 | 1046 | static void |
feb261e2 | 1047 | bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt) |
3d5b0605 | 1048 | { |
3d5b0605 | 1049 | int soff = 0; |
feb261e2 KO |
1050 | struct bio_vec bv; |
1051 | ||
1052 | iter.bi_size = cnt; | |
1053 | ||
1054 | __bio_for_each_segment(bv, bio, iter, iter) { | |
1055 | char *p = page_address(bv.bv_page) + bv.bv_offset; | |
1056 | skb_copy_bits(skb, soff, p, bv.bv_len); | |
1057 | soff += bv.bv_len; | |
1058 | } | |
3d5b0605 EC |
1059 | } |
1060 | ||
69cf2d85 EC |
1061 | void |
1062 | aoe_end_request(struct aoedev *d, struct request *rq, int fastfail) | |
1063 | { | |
1064 | struct bio *bio; | |
1065 | int bok; | |
1066 | struct request_queue *q; | |
1067 | ||
1068 | q = d->blkq; | |
1069 | if (rq == d->ip.rq) | |
1070 | d->ip.rq = NULL; | |
1071 | do { | |
1072 | bio = rq->bio; | |
4246a0b6 | 1073 | bok = !fastfail && !bio->bi_error; |
4f024f37 | 1074 | } while (__blk_end_request(rq, bok ? 0 : -EIO, bio->bi_iter.bi_size)); |
69cf2d85 EC |
1075 | |
1076 | /* cf. http://lkml.org/lkml/2006/10/31/28 */ | |
1077 | if (!fastfail) | |
11cfb6ff | 1078 | __blk_run_queue(q); |
69cf2d85 EC |
1079 | } |
1080 | ||
1081 | static void | |
1082 | aoe_end_buf(struct aoedev *d, struct buf *buf) | |
1083 | { | |
1084 | struct request *rq; | |
1085 | unsigned long n; | |
1086 | ||
1087 | if (buf == d->ip.buf) | |
1088 | d->ip.buf = NULL; | |
1089 | rq = buf->rq; | |
69cf2d85 EC |
1090 | mempool_free(buf, d->bufpool); |
1091 | n = (unsigned long) rq->special; | |
1092 | rq->special = (void *) --n; | |
1093 | if (n == 0) | |
1094 | aoe_end_request(d, rq, 0); | |
1095 | } | |
1096 | ||
3d5b0605 | 1097 | static void |
896831f5 | 1098 | ktiocomplete(struct frame *f) |
3d5b0605 | 1099 | { |
896831f5 EC |
1100 | struct aoe_hdr *hin, *hout; |
1101 | struct aoe_atahdr *ahin, *ahout; | |
1102 | struct buf *buf; | |
1103 | struct sk_buff *skb; | |
1104 | struct aoetgt *t; | |
1105 | struct aoeif *ifp; | |
1106 | struct aoedev *d; | |
1107 | long n; | |
bbb44e30 | 1108 | int untainted; |
3d5b0605 | 1109 | |
896831f5 | 1110 | if (f == NULL) |
3d5b0605 | 1111 | return; |
896831f5 EC |
1112 | |
1113 | t = f->t; | |
1114 | d = t->d; | |
bbb44e30 EC |
1115 | skb = f->r_skb; |
1116 | buf = f->buf; | |
1117 | if (f->flags & FFL_PROBE) | |
1118 | goto out; | |
1119 | if (!skb) /* just fail the buf. */ | |
1120 | goto noskb; | |
896831f5 EC |
1121 | |
1122 | hout = (struct aoe_hdr *) skb_mac_header(f->skb); | |
1123 | ahout = (struct aoe_atahdr *) (hout+1); | |
896831f5 EC |
1124 | |
1125 | hin = (struct aoe_hdr *) skb->data; | |
1126 | skb_pull(skb, sizeof(*hin)); | |
1127 | ahin = (struct aoe_atahdr *) skb->data; | |
1128 | skb_pull(skb, sizeof(*ahin)); | |
1129 | if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */ | |
1130 | pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n", | |
1131 | ahout->cmdstat, ahin->cmdstat, | |
1132 | d->aoemajor, d->aoeminor); | |
a04b41cd | 1133 | noskb: if (buf) |
4246a0b6 | 1134 | buf->bio->bi_error = -EIO; |
bbb44e30 | 1135 | goto out; |
3d5b0605 | 1136 | } |
896831f5 EC |
1137 | |
1138 | n = ahout->scnt << 9; | |
1139 | switch (ahout->cmdstat) { | |
1140 | case ATA_CMD_PIO_READ: | |
1141 | case ATA_CMD_PIO_READ_EXT: | |
1142 | if (skb->len < n) { | |
bf29754a EC |
1143 | pr_err("%s e%ld.%d. skb->len=%d need=%ld\n", |
1144 | "aoe: runt data size in read from", | |
1145 | (long) d->aoemajor, d->aoeminor, | |
1146 | skb->len, n); | |
4246a0b6 | 1147 | buf->bio->bi_error = -EIO; |
896831f5 EC |
1148 | break; |
1149 | } | |
feb261e2 KO |
1150 | if (n > f->iter.bi_size) { |
1151 | pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n", | |
1152 | "aoe: too-large data size in read from", | |
1153 | (long) d->aoemajor, d->aoeminor, | |
1154 | n, f->iter.bi_size); | |
4246a0b6 | 1155 | buf->bio->bi_error = -EIO; |
feb261e2 KO |
1156 | break; |
1157 | } | |
1158 | bvcpy(skb, f->buf->bio, f->iter, n); | |
896831f5 EC |
1159 | case ATA_CMD_PIO_WRITE: |
1160 | case ATA_CMD_PIO_WRITE_EXT: | |
1161 | spin_lock_irq(&d->lock); | |
1162 | ifp = getif(t, skb->dev); | |
3f0f0133 | 1163 | if (ifp) |
896831f5 | 1164 | ifp->lost = 0; |
896831f5 EC |
1165 | spin_unlock_irq(&d->lock); |
1166 | break; | |
1167 | case ATA_CMD_ID_ATA: | |
1168 | if (skb->len < 512) { | |
bf29754a EC |
1169 | pr_info("%s e%ld.%d. skb->len=%d need=512\n", |
1170 | "aoe: runt data size in ataid from", | |
1171 | (long) d->aoemajor, d->aoeminor, | |
896831f5 EC |
1172 | skb->len); |
1173 | break; | |
1174 | } | |
1175 | if (skb_linearize(skb)) | |
1176 | break; | |
1177 | spin_lock_irq(&d->lock); | |
1178 | ataid_complete(d, t, skb->data); | |
1179 | spin_unlock_irq(&d->lock); | |
1180 | break; | |
1181 | default: | |
1182 | pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n", | |
1183 | ahout->cmdstat, | |
1184 | be16_to_cpu(get_unaligned(&hin->major)), | |
1185 | hin->minor); | |
1186 | } | |
bbb44e30 | 1187 | out: |
896831f5 | 1188 | spin_lock_irq(&d->lock); |
bbb44e30 EC |
1189 | if (t->taint > 0 |
1190 | && --t->taint > 0 | |
1191 | && t->nout_probes == 0) { | |
1192 | count_targets(d, &untainted); | |
1193 | if (untainted > 0) { | |
1194 | probe(t); | |
1195 | t->nout_probes++; | |
1196 | } | |
1197 | } | |
896831f5 EC |
1198 | |
1199 | aoe_freetframe(f); | |
1200 | ||
feb261e2 | 1201 | if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0) |
69cf2d85 | 1202 | aoe_end_buf(d, buf); |
896831f5 | 1203 | |
69cf2d85 EC |
1204 | spin_unlock_irq(&d->lock); |
1205 | aoedev_put(d); | |
896831f5 | 1206 | dev_kfree_skb(skb); |
3d5b0605 EC |
1207 | } |
1208 | ||
896831f5 EC |
1209 | /* Enters with iocq.lock held. |
1210 | * Returns true iff responses needing processing remain. | |
1211 | */ | |
1212 | static int | |
8030d343 | 1213 | ktio(int id) |
896831f5 EC |
1214 | { |
1215 | struct frame *f; | |
1216 | struct list_head *pos; | |
1217 | int i; | |
8030d343 | 1218 | int actual_id; |
896831f5 EC |
1219 | |
1220 | for (i = 0; ; ++i) { | |
1221 | if (i == MAXIOC) | |
1222 | return 1; | |
8030d343 | 1223 | if (list_empty(&iocq[id].head)) |
896831f5 | 1224 | return 0; |
8030d343 | 1225 | pos = iocq[id].head.next; |
896831f5 | 1226 | list_del(pos); |
896831f5 | 1227 | f = list_entry(pos, struct frame, head); |
8030d343 | 1228 | spin_unlock_irq(&iocq[id].lock); |
896831f5 | 1229 | ktiocomplete(f); |
8030d343 EC |
1230 | |
1231 | /* Figure out if extra threads are required. */ | |
1232 | actual_id = f->t->d->aoeminor % ncpus; | |
1233 | ||
1234 | if (!kts[actual_id].active) { | |
1235 | BUG_ON(id != 0); | |
1236 | mutex_lock(&ktio_spawn_lock); | |
1237 | if (!kts[actual_id].active | |
1238 | && aoe_ktstart(&kts[actual_id]) == 0) | |
1239 | kts[actual_id].active = 1; | |
1240 | mutex_unlock(&ktio_spawn_lock); | |
1241 | } | |
1242 | spin_lock_irq(&iocq[id].lock); | |
896831f5 EC |
1243 | } |
1244 | } | |
1245 | ||
1246 | static int | |
1247 | kthread(void *vp) | |
1248 | { | |
1249 | struct ktstate *k; | |
1250 | DECLARE_WAITQUEUE(wait, current); | |
1251 | int more; | |
1252 | ||
1253 | k = vp; | |
1254 | current->flags |= PF_NOFREEZE; | |
1255 | set_user_nice(current, -10); | |
1256 | complete(&k->rendez); /* tell spawner we're running */ | |
1257 | do { | |
1258 | spin_lock_irq(k->lock); | |
8030d343 | 1259 | more = k->fn(k->id); |
896831f5 EC |
1260 | if (!more) { |
1261 | add_wait_queue(k->waitq, &wait); | |
1262 | __set_current_state(TASK_INTERRUPTIBLE); | |
1263 | } | |
1264 | spin_unlock_irq(k->lock); | |
1265 | if (!more) { | |
1266 | schedule(); | |
1267 | remove_wait_queue(k->waitq, &wait); | |
1268 | } else | |
1269 | cond_resched(); | |
1270 | } while (!kthread_should_stop()); | |
1271 | complete(&k->rendez); /* tell spawner we're stopping */ | |
1272 | return 0; | |
1273 | } | |
1274 | ||
eb086ec5 | 1275 | void |
896831f5 EC |
1276 | aoe_ktstop(struct ktstate *k) |
1277 | { | |
1278 | kthread_stop(k->task); | |
1279 | wait_for_completion(&k->rendez); | |
1280 | } | |
1281 | ||
eb086ec5 | 1282 | int |
896831f5 EC |
1283 | aoe_ktstart(struct ktstate *k) |
1284 | { | |
1285 | struct task_struct *task; | |
1286 | ||
1287 | init_completion(&k->rendez); | |
f170168b | 1288 | task = kthread_run(kthread, k, "%s", k->name); |
896831f5 EC |
1289 | if (task == NULL || IS_ERR(task)) |
1290 | return -ENOMEM; | |
1291 | k->task = task; | |
1292 | wait_for_completion(&k->rendez); /* allow kthread to start */ | |
1293 | init_completion(&k->rendez); /* for waiting for exit later */ | |
1294 | return 0; | |
1295 | } | |
1296 | ||
1297 | /* pass it off to kthreads for processing */ | |
1298 | static void | |
1299 | ktcomplete(struct frame *f, struct sk_buff *skb) | |
1300 | { | |
8030d343 | 1301 | int id; |
896831f5 EC |
1302 | ulong flags; |
1303 | ||
1304 | f->r_skb = skb; | |
8030d343 EC |
1305 | id = f->t->d->aoeminor % ncpus; |
1306 | spin_lock_irqsave(&iocq[id].lock, flags); | |
1307 | if (!kts[id].active) { | |
1308 | spin_unlock_irqrestore(&iocq[id].lock, flags); | |
1309 | /* The thread with id has not been spawned yet, | |
1310 | * so delegate the work to the main thread and | |
1311 | * try spawning a new thread. | |
1312 | */ | |
1313 | id = 0; | |
1314 | spin_lock_irqsave(&iocq[id].lock, flags); | |
1315 | } | |
1316 | list_add_tail(&f->head, &iocq[id].head); | |
1317 | spin_unlock_irqrestore(&iocq[id].lock, flags); | |
1318 | wake_up(&ktiowq[id]); | |
896831f5 EC |
1319 | } |
1320 | ||
1321 | struct sk_buff * | |
1da177e4 LT |
1322 | aoecmd_ata_rsp(struct sk_buff *skb) |
1323 | { | |
1324 | struct aoedev *d; | |
896831f5 | 1325 | struct aoe_hdr *h; |
1da177e4 | 1326 | struct frame *f; |
896831f5 | 1327 | u32 n; |
1da177e4 LT |
1328 | ulong flags; |
1329 | char ebuf[128]; | |
32465c65 EC |
1330 | u16 aoemajor; |
1331 | ||
896831f5 EC |
1332 | h = (struct aoe_hdr *) skb->data; |
1333 | aoemajor = be16_to_cpu(get_unaligned(&h->major)); | |
0c966214 | 1334 | d = aoedev_by_aoeaddr(aoemajor, h->minor, 0); |
1da177e4 LT |
1335 | if (d == NULL) { |
1336 | snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response " | |
1337 | "for unknown device %d.%d\n", | |
896831f5 | 1338 | aoemajor, h->minor); |
1da177e4 | 1339 | aoechr_error(ebuf); |
896831f5 | 1340 | return skb; |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | spin_lock_irqsave(&d->lock, flags); | |
1344 | ||
896831f5 | 1345 | n = be32_to_cpu(get_unaligned(&h->tag)); |
64a80f5a | 1346 | f = getframe(d, n); |
3a0c40d2 | 1347 | if (f) { |
5f0c9c48 | 1348 | calc_rttavg(d, f->t, tsince_hr(f)); |
3a0c40d2 | 1349 | f->t->nout--; |
bbb44e30 EC |
1350 | if (f->flags & FFL_PROBE) |
1351 | f->t->nout_probes--; | |
3a0c40d2 EC |
1352 | } else { |
1353 | f = getframe_deferred(d, n); | |
1354 | if (f) { | |
5f0c9c48 | 1355 | calc_rttavg(d, NULL, tsince_hr(f)); |
3a0c40d2 EC |
1356 | } else { |
1357 | calc_rttavg(d, NULL, tsince(n)); | |
1358 | spin_unlock_irqrestore(&d->lock, flags); | |
1359 | aoedev_put(d); | |
1360 | snprintf(ebuf, sizeof(ebuf), | |
2292a7e1 | 1361 | "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n", |
3a0c40d2 EC |
1362 | "unexpected rsp", |
1363 | get_unaligned_be16(&h->major), | |
1364 | h->minor, | |
1365 | get_unaligned_be32(&h->tag), | |
2292a7e1 EC |
1366 | jiffies, |
1367 | h->src, | |
1368 | h->dst); | |
3a0c40d2 EC |
1369 | aoechr_error(ebuf); |
1370 | return skb; | |
1371 | } | |
1da177e4 | 1372 | } |
1da177e4 | 1373 | aoecmd_work(d); |
1da177e4 LT |
1374 | |
1375 | spin_unlock_irqrestore(&d->lock, flags); | |
896831f5 EC |
1376 | |
1377 | ktcomplete(f, skb); | |
1378 | ||
1379 | /* | |
1380 | * Note here that we do not perform an aoedev_put, as we are | |
1381 | * leaving this reference for the ktio to release. | |
1382 | */ | |
1383 | return NULL; | |
1da177e4 LT |
1384 | } |
1385 | ||
1386 | void | |
1387 | aoecmd_cfg(ushort aoemajor, unsigned char aoeminor) | |
1388 | { | |
e9bb8fb0 | 1389 | struct sk_buff_head queue; |
1da177e4 | 1390 | |
e9bb8fb0 DM |
1391 | __skb_queue_head_init(&queue); |
1392 | aoecmd_cfg_pkts(aoemajor, aoeminor, &queue); | |
1393 | aoenet_xmit(&queue); | |
1da177e4 | 1394 | } |
a04b41cd | 1395 | |
68e0d42f | 1396 | struct sk_buff * |
1da177e4 LT |
1397 | aoecmd_ata_id(struct aoedev *d) |
1398 | { | |
1399 | struct aoe_hdr *h; | |
1400 | struct aoe_atahdr *ah; | |
1401 | struct frame *f; | |
1402 | struct sk_buff *skb; | |
68e0d42f | 1403 | struct aoetgt *t; |
1da177e4 | 1404 | |
896831f5 | 1405 | f = newframe(d); |
68e0d42f | 1406 | if (f == NULL) |
1da177e4 | 1407 | return NULL; |
68e0d42f EC |
1408 | |
1409 | t = *d->tgt; | |
1da177e4 LT |
1410 | |
1411 | /* initialize the headers & frame */ | |
e407a7f6 | 1412 | skb = f->skb; |
abdbf94d | 1413 | h = (struct aoe_hdr *) skb_mac_header(skb); |
1da177e4 | 1414 | ah = (struct aoe_atahdr *) (h+1); |
19900cde EC |
1415 | skb_put(skb, sizeof *h + sizeof *ah); |
1416 | memset(h, 0, skb->len); | |
68e0d42f | 1417 | f->tag = aoehdr_atainit(d, t, h); |
896831f5 | 1418 | fhash(f); |
68e0d42f | 1419 | t->nout++; |
1da177e4 | 1420 | f->waited = 0; |
3fc9b032 | 1421 | f->waited_total = 0; |
1da177e4 | 1422 | |
1da177e4 LT |
1423 | /* set up ata header */ |
1424 | ah->scnt = 1; | |
04b3ab52 | 1425 | ah->cmdstat = ATA_CMD_ID_ATA; |
1da177e4 LT |
1426 | ah->lba3 = 0xa0; |
1427 | ||
68e0d42f | 1428 | skb->dev = t->ifp->nd; |
1da177e4 | 1429 | |
3a0c40d2 EC |
1430 | d->rttavg = RTTAVG_INIT; |
1431 | d->rttdev = RTTDEV_INIT; | |
1da177e4 | 1432 | d->timer.function = rexmit_timer; |
1da177e4 | 1433 | |
5f0c9c48 EC |
1434 | skb = skb_clone(skb, GFP_ATOMIC); |
1435 | if (skb) { | |
1436 | do_gettimeofday(&f->sent); | |
1437 | f->sent_jiffs = (u32) jiffies; | |
1438 | } | |
1439 | ||
1440 | return skb; | |
1da177e4 | 1441 | } |
a04b41cd | 1442 | |
71114ec4 EC |
1443 | static struct aoetgt ** |
1444 | grow_targets(struct aoedev *d) | |
1445 | { | |
1446 | ulong oldn, newn; | |
1447 | struct aoetgt **tt; | |
1448 | ||
1449 | oldn = d->ntargets; | |
1450 | newn = oldn * 2; | |
1451 | tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC); | |
1452 | if (!tt) | |
1453 | return NULL; | |
1454 | memmove(tt, d->targets, sizeof(*d->targets) * oldn); | |
1455 | d->tgt = tt + (d->tgt - d->targets); | |
1456 | kfree(d->targets); | |
1457 | d->targets = tt; | |
1458 | d->ntargets = newn; | |
1459 | ||
1460 | return &d->targets[oldn]; | |
1461 | } | |
1462 | ||
68e0d42f EC |
1463 | static struct aoetgt * |
1464 | addtgt(struct aoedev *d, char *addr, ulong nframes) | |
1465 | { | |
1466 | struct aoetgt *t, **tt, **te; | |
68e0d42f EC |
1467 | |
1468 | tt = d->targets; | |
71114ec4 | 1469 | te = tt + d->ntargets; |
68e0d42f EC |
1470 | for (; tt < te && *tt; tt++) |
1471 | ; | |
1472 | ||
578c4aa0 | 1473 | if (tt == te) { |
71114ec4 EC |
1474 | tt = grow_targets(d); |
1475 | if (!tt) | |
1476 | goto nomem; | |
578c4aa0 | 1477 | } |
896831f5 | 1478 | t = kzalloc(sizeof(*t), GFP_ATOMIC); |
71114ec4 EC |
1479 | if (!t) |
1480 | goto nomem; | |
68e0d42f | 1481 | t->nframes = nframes; |
896831f5 | 1482 | t->d = d; |
68e0d42f EC |
1483 | memcpy(t->addr, addr, sizeof t->addr); |
1484 | t->ifp = t->ifs; | |
3a0c40d2 | 1485 | aoecmd_wreset(t); |
bbb44e30 | 1486 | t->maxout = t->nframes / 2; |
896831f5 | 1487 | INIT_LIST_HEAD(&t->ffree); |
68e0d42f | 1488 | return *tt = t; |
71114ec4 EC |
1489 | |
1490 | nomem: | |
1491 | pr_info("aoe: cannot allocate memory to add target\n"); | |
1492 | return NULL; | |
68e0d42f EC |
1493 | } |
1494 | ||
3f0f0133 EC |
1495 | static void |
1496 | setdbcnt(struct aoedev *d) | |
1497 | { | |
1498 | struct aoetgt **t, **e; | |
1499 | int bcnt = 0; | |
1500 | ||
1501 | t = d->targets; | |
71114ec4 | 1502 | e = t + d->ntargets; |
3f0f0133 EC |
1503 | for (; t < e && *t; t++) |
1504 | if (bcnt == 0 || bcnt > (*t)->minbcnt) | |
1505 | bcnt = (*t)->minbcnt; | |
1506 | if (bcnt != d->maxbcnt) { | |
1507 | d->maxbcnt = bcnt; | |
1508 | pr_info("aoe: e%ld.%d: setting %d byte data frames\n", | |
1509 | d->aoemajor, d->aoeminor, bcnt); | |
1510 | } | |
1511 | } | |
1512 | ||
1513 | static void | |
1514 | setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt) | |
1515 | { | |
1516 | struct aoedev *d; | |
1517 | struct aoeif *p, *e; | |
1518 | int minbcnt; | |
1519 | ||
1520 | d = t->d; | |
1521 | minbcnt = bcnt; | |
1522 | p = t->ifs; | |
1523 | e = p + NAOEIFS; | |
1524 | for (; p < e; p++) { | |
1525 | if (p->nd == NULL) | |
1526 | break; /* end of the valid interfaces */ | |
1527 | if (p->nd == nd) { | |
1528 | p->bcnt = bcnt; /* we're updating */ | |
1529 | nd = NULL; | |
1530 | } else if (minbcnt > p->bcnt) | |
1531 | minbcnt = p->bcnt; /* find the min interface */ | |
1532 | } | |
1533 | if (nd) { | |
1534 | if (p == e) { | |
1535 | pr_err("aoe: device setifbcnt failure; too many interfaces.\n"); | |
1536 | return; | |
1537 | } | |
1b86fda9 | 1538 | dev_hold(nd); |
3f0f0133 EC |
1539 | p->nd = nd; |
1540 | p->bcnt = bcnt; | |
1541 | } | |
1542 | t->minbcnt = minbcnt; | |
1543 | setdbcnt(d); | |
1544 | } | |
1545 | ||
1da177e4 LT |
1546 | void |
1547 | aoecmd_cfg_rsp(struct sk_buff *skb) | |
1548 | { | |
1549 | struct aoedev *d; | |
1550 | struct aoe_hdr *h; | |
1551 | struct aoe_cfghdr *ch; | |
68e0d42f | 1552 | struct aoetgt *t; |
0c966214 | 1553 | ulong flags, aoemajor; |
1da177e4 | 1554 | struct sk_buff *sl; |
69cf2d85 | 1555 | struct sk_buff_head queue; |
19bf2635 | 1556 | u16 n; |
1da177e4 | 1557 | |
69cf2d85 | 1558 | sl = NULL; |
abdbf94d | 1559 | h = (struct aoe_hdr *) skb_mac_header(skb); |
1da177e4 LT |
1560 | ch = (struct aoe_cfghdr *) (h+1); |
1561 | ||
1562 | /* | |
1563 | * Enough people have their dip switches set backwards to | |
1564 | * warrant a loud message for this special case. | |
1565 | */ | |
823ed72e | 1566 | aoemajor = get_unaligned_be16(&h->major); |
1da177e4 | 1567 | if (aoemajor == 0xfff) { |
a12c93f0 | 1568 | printk(KERN_ERR "aoe: Warning: shelf address is all ones. " |
6bb6285f | 1569 | "Check shelf dip switches.\n"); |
1da177e4 LT |
1570 | return; |
1571 | } | |
7159e969 EC |
1572 | if (aoemajor == 0xffff) { |
1573 | pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n", | |
0c966214 | 1574 | aoemajor, (int) h->minor); |
6583303c EC |
1575 | return; |
1576 | } | |
7159e969 EC |
1577 | if (h->minor == 0xff) { |
1578 | pr_info("aoe: e%ld.%d: broadcast slot number invalid\n", | |
1579 | aoemajor, (int) h->minor); | |
1da177e4 LT |
1580 | return; |
1581 | } | |
1582 | ||
19bf2635 | 1583 | n = be16_to_cpu(ch->bufcnt); |
7df620d8 EC |
1584 | if (n > aoe_maxout) /* keep it reasonable */ |
1585 | n = aoe_maxout; | |
1da177e4 | 1586 | |
7159e969 EC |
1587 | d = aoedev_by_aoeaddr(aoemajor, h->minor, 1); |
1588 | if (d == NULL) { | |
1589 | pr_info("aoe: device allocation failure\n"); | |
1590 | return; | |
1591 | } | |
1592 | ||
1da177e4 LT |
1593 | spin_lock_irqsave(&d->lock, flags); |
1594 | ||
68e0d42f | 1595 | t = gettgt(d, h->src); |
1b8a1636 EC |
1596 | if (t) { |
1597 | t->nframes = n; | |
1598 | if (n < t->maxout) | |
3a0c40d2 | 1599 | aoecmd_wreset(t); |
1b8a1636 | 1600 | } else { |
68e0d42f | 1601 | t = addtgt(d, h->src, n); |
69cf2d85 EC |
1602 | if (!t) |
1603 | goto bail; | |
68e0d42f | 1604 | } |
3f0f0133 EC |
1605 | n = skb->dev->mtu; |
1606 | n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr); | |
1607 | n /= 512; | |
1608 | if (n > ch->scnt) | |
1609 | n = ch->scnt; | |
1610 | n = n ? n * 512 : DEFAULTBCNT; | |
1611 | setifbcnt(t, skb->dev, n); | |
3ae1c24e EC |
1612 | |
1613 | /* don't change users' perspective */ | |
69cf2d85 EC |
1614 | if (d->nopen == 0) { |
1615 | d->fw_ver = be16_to_cpu(ch->fwver); | |
1616 | sl = aoecmd_ata_id(d); | |
1da177e4 | 1617 | } |
69cf2d85 | 1618 | bail: |
1da177e4 | 1619 | spin_unlock_irqrestore(&d->lock, flags); |
69cf2d85 | 1620 | aoedev_put(d); |
e9bb8fb0 | 1621 | if (sl) { |
e9bb8fb0 DM |
1622 | __skb_queue_head_init(&queue); |
1623 | __skb_queue_tail(&queue, sl); | |
1624 | aoenet_xmit(&queue); | |
1625 | } | |
1da177e4 LT |
1626 | } |
1627 | ||
3a0c40d2 EC |
1628 | void |
1629 | aoecmd_wreset(struct aoetgt *t) | |
1630 | { | |
1631 | t->maxout = 1; | |
1632 | t->ssthresh = t->nframes / 2; | |
1633 | t->next_cwnd = t->nframes; | |
1634 | } | |
1635 | ||
68e0d42f EC |
1636 | void |
1637 | aoecmd_cleanslate(struct aoedev *d) | |
1638 | { | |
1639 | struct aoetgt **t, **te; | |
68e0d42f | 1640 | |
3a0c40d2 EC |
1641 | d->rttavg = RTTAVG_INIT; |
1642 | d->rttdev = RTTDEV_INIT; | |
3f0f0133 | 1643 | d->maxbcnt = 0; |
68e0d42f EC |
1644 | |
1645 | t = d->targets; | |
71114ec4 | 1646 | te = t + d->ntargets; |
3f0f0133 | 1647 | for (; t < te && *t; t++) |
3a0c40d2 | 1648 | aoecmd_wreset(*t); |
68e0d42f | 1649 | } |
896831f5 | 1650 | |
69cf2d85 EC |
1651 | void |
1652 | aoe_failbuf(struct aoedev *d, struct buf *buf) | |
1653 | { | |
1654 | if (buf == NULL) | |
1655 | return; | |
feb261e2 | 1656 | buf->iter.bi_size = 0; |
4246a0b6 | 1657 | buf->bio->bi_error = -EIO; |
69cf2d85 EC |
1658 | if (buf->nframesout == 0) |
1659 | aoe_end_buf(d, buf); | |
1660 | } | |
1661 | ||
1662 | void | |
1663 | aoe_flush_iocq(void) | |
8030d343 EC |
1664 | { |
1665 | int i; | |
1666 | ||
1667 | for (i = 0; i < ncpus; i++) { | |
1668 | if (kts[i].active) | |
1669 | aoe_flush_iocq_by_index(i); | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | void | |
1674 | aoe_flush_iocq_by_index(int id) | |
896831f5 EC |
1675 | { |
1676 | struct frame *f; | |
1677 | struct aoedev *d; | |
1678 | LIST_HEAD(flist); | |
1679 | struct list_head *pos; | |
1680 | struct sk_buff *skb; | |
1681 | ulong flags; | |
1682 | ||
8030d343 EC |
1683 | spin_lock_irqsave(&iocq[id].lock, flags); |
1684 | list_splice_init(&iocq[id].head, &flist); | |
1685 | spin_unlock_irqrestore(&iocq[id].lock, flags); | |
896831f5 EC |
1686 | while (!list_empty(&flist)) { |
1687 | pos = flist.next; | |
1688 | list_del(pos); | |
1689 | f = list_entry(pos, struct frame, head); | |
1690 | d = f->t->d; | |
1691 | skb = f->r_skb; | |
1692 | spin_lock_irqsave(&d->lock, flags); | |
1693 | if (f->buf) { | |
1694 | f->buf->nframesout--; | |
1695 | aoe_failbuf(d, f->buf); | |
1696 | } | |
1697 | aoe_freetframe(f); | |
1698 | spin_unlock_irqrestore(&d->lock, flags); | |
1699 | dev_kfree_skb(skb); | |
69cf2d85 | 1700 | aoedev_put(d); |
896831f5 EC |
1701 | } |
1702 | } | |
1703 | ||
1704 | int __init | |
1705 | aoecmd_init(void) | |
1706 | { | |
bbb44e30 | 1707 | void *p; |
8030d343 EC |
1708 | int i; |
1709 | int ret; | |
bbb44e30 EC |
1710 | |
1711 | /* get_zeroed_page returns page with ref count 1 */ | |
32d6bd90 | 1712 | p = (void *) get_zeroed_page(GFP_KERNEL); |
bbb44e30 EC |
1713 | if (!p) |
1714 | return -ENOMEM; | |
1715 | empty_page = virt_to_page(p); | |
1716 | ||
8030d343 EC |
1717 | ncpus = num_online_cpus(); |
1718 | ||
1719 | iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL); | |
1720 | if (!iocq) | |
1721 | return -ENOMEM; | |
1722 | ||
1723 | kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL); | |
1724 | if (!kts) { | |
1725 | ret = -ENOMEM; | |
1726 | goto kts_fail; | |
1727 | } | |
1728 | ||
1729 | ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL); | |
1730 | if (!ktiowq) { | |
1731 | ret = -ENOMEM; | |
1732 | goto ktiowq_fail; | |
1733 | } | |
1734 | ||
1735 | mutex_init(&ktio_spawn_lock); | |
1736 | ||
1737 | for (i = 0; i < ncpus; i++) { | |
1738 | INIT_LIST_HEAD(&iocq[i].head); | |
1739 | spin_lock_init(&iocq[i].lock); | |
1740 | init_waitqueue_head(&ktiowq[i]); | |
1741 | snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i); | |
1742 | kts[i].fn = ktio; | |
1743 | kts[i].waitq = &ktiowq[i]; | |
1744 | kts[i].lock = &iocq[i].lock; | |
1745 | kts[i].id = i; | |
1746 | kts[i].active = 0; | |
1747 | } | |
1748 | kts[0].active = 1; | |
1749 | if (aoe_ktstart(&kts[0])) { | |
1750 | ret = -ENOMEM; | |
1751 | goto ktstart_fail; | |
1752 | } | |
1753 | return 0; | |
1754 | ||
1755 | ktstart_fail: | |
1756 | kfree(ktiowq); | |
1757 | ktiowq_fail: | |
1758 | kfree(kts); | |
1759 | kts_fail: | |
1760 | kfree(iocq); | |
1761 | ||
1762 | return ret; | |
896831f5 EC |
1763 | } |
1764 | ||
1765 | void | |
1766 | aoecmd_exit(void) | |
1767 | { | |
8030d343 EC |
1768 | int i; |
1769 | ||
1770 | for (i = 0; i < ncpus; i++) | |
1771 | if (kts[i].active) | |
1772 | aoe_ktstop(&kts[i]); | |
1773 | ||
69cf2d85 | 1774 | aoe_flush_iocq(); |
bbb44e30 | 1775 | |
8030d343 EC |
1776 | /* Free up the iocq and thread speicific configuration |
1777 | * allocated during startup. | |
1778 | */ | |
1779 | kfree(iocq); | |
1780 | kfree(kts); | |
1781 | kfree(ktiowq); | |
1782 | ||
bbb44e30 EC |
1783 | free_page((unsigned long) page_address(empty_page)); |
1784 | empty_page = NULL; | |
896831f5 | 1785 | } |