blob: 422b7d84f686b90147f97565210687d343a3d9eb [file] [log] [blame]
Ed Cashinca47bbd2013-07-03 15:09:06 -07001/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * aoecmd.c
4 * Filesystem request handling methods
5 */
6
Bartlomiej Zolnierkiewicz04b3ab52009-04-01 21:42:24 +02007#include <linux/ata.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/hdreg.h>
10#include <linux/blkdev.h>
11#include <linux/skbuff.h>
12#include <linux/netdevice.h>
Ed L. Cashin3ae1c242006-01-19 13:46:19 -050013#include <linux/genhd.h>
Ed L. Cashin68e0d422008-02-08 04:20:00 -080014#include <linux/moduleparam.h>
Ed Cashin896831f2012-10-04 17:16:21 -070015#include <linux/workqueue.h>
16#include <linux/kthread.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070017#include <net/net_namespace.h>
Ed L. Cashin475172f2005-09-29 12:47:40 -040018#include <asm/unaligned.h>
Ed Cashin896831f2012-10-04 17:16:21 -070019#include <linux/uio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "aoe.h"
21
Ed Cashin896831f2012-10-04 17:16:21 -070022#define MAXIOC (8192) /* default meant to avoid most soft lockups */
23
24static void ktcomplete(struct frame *, struct sk_buff *);
Ed Cashinbbb44e32012-12-17 16:04:08 -080025static int count_targets(struct aoedev *d, int *untainted);
Ed Cashin896831f2012-10-04 17:16:21 -070026
Ed Cashin69cf2d852012-10-04 17:16:23 -070027static struct buf *nextbuf(struct aoedev *);
28
Ed L. Cashinb751e8b2006-09-20 14:36:50 -040029static int aoe_deadsecs = 60 * 3;
30module_param(aoe_deadsecs, int, 0644);
31MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Ed Cashin7b6ccc52012-12-17 16:04:00 -080033static int aoe_maxout = 64;
Ed L. Cashin7df620d2008-02-08 04:20:07 -080034module_param(aoe_maxout, int, 0644);
35MODULE_PARM_DESC(aoe_maxout,
36 "Only aoe_maxout outstanding packets for every MAC on eX.Y.");
37
Ed Cashin8030d342013-07-03 15:09:05 -070038/* 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 */
45static int ncpus;
46
47/* mutex lock used for synchronization while thread spawning */
48static DEFINE_MUTEX(ktio_spawn_lock);
49
50static wait_queue_head_t *ktiowq;
51static struct ktstate *kts;
Ed Cashin896831f2012-10-04 17:16:21 -070052
53/* io completion queue */
Ed Cashin8030d342013-07-03 15:09:05 -070054struct iocq_ktio {
Ed Cashin896831f2012-10-04 17:16:21 -070055 struct list_head head;
56 spinlock_t lock;
Ed Cashin8030d342013-07-03 15:09:05 -070057};
58static struct iocq_ktio *iocq;
Ed Cashin896831f2012-10-04 17:16:21 -070059
Ed Cashinbbb44e32012-12-17 16:04:08 -080060static struct page *empty_page;
61
Ed L. Cashin68e0d422008-02-08 04:20:00 -080062static struct sk_buff *
Ed L. Cashine407a7f2006-09-20 14:36:49 -040063new_skb(ulong len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 struct sk_buff *skb;
66
Eric Dumazet91c57462013-03-27 18:28:41 +000067 skb = alloc_skb(len + MAX_HEADER, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 if (skb) {
Eric Dumazet91c57462013-03-27 18:28:41 +000069 skb_reserve(skb, MAX_HEADER);
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -070070 skb_reset_mac_header(skb);
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -070071 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 skb->protocol = __constant_htons(ETH_P_AOE);
Ed Cashin8babe8c2012-09-19 15:46:39 +000073 skb_checksum_none_assert(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
75 return skb;
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static struct frame *
Ed Cashin3a0c40d2012-12-17 16:03:43 -080079getframe_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
95static struct frame *
Ed Cashin64a80f52012-10-04 17:16:33 -070096getframe(struct aoedev *d, u32 tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Ed Cashin896831f2012-10-04 17:16:21 -070098 struct frame *f;
99 struct list_head *head, *pos, *nx;
100 u32 n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Ed Cashin896831f2012-10-04 17:16:21 -0700102 n = tag % NFACTIVE;
Ed Cashin64a80f52012-10-04 17:16:33 -0700103 head = &d->factive[n];
Ed Cashin896831f2012-10-04 17:16:21 -0700104 list_for_each_safe(pos, nx, head) {
105 f = list_entry(pos, struct frame, head);
106 if (f->tag == tag) {
107 list_del(pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return f;
Ed Cashin896831f2012-10-04 17:16:21 -0700109 }
110 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 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 */
119static int
Ed Cashin64a80f52012-10-04 17:16:33 -0700120newtag(struct aoedev *d)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
122 register ulong n;
123
124 n = jiffies & 0xffff;
Ed Cashin64a80f52012-10-04 17:16:33 -0700125 return n |= (++d->lasttag & 0x7fff) << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
127
Ed Cashin896831f2012-10-04 17:16:21 -0700128static u32
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800129aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Ed Cashin64a80f52012-10-04 17:16:33 -0700131 u32 host_tag = newtag(d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800133 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
134 memcpy(h->dst, t->addr, sizeof h->dst);
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -0700135 h->type = __constant_cpu_to_be16(ETH_P_AOE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 h->verfl = AOE_HVER;
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -0700137 h->major = cpu_to_be16(d->aoemajor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 h->minor = d->aoeminor;
139 h->cmd = AOECMD_ATA;
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -0700140 h->tag = cpu_to_be32(host_tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 return host_tag;
143}
144
Ed L. Cashin19bf2632006-09-20 14:36:49 -0400145static inline void
146put_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
Ed Cashin3f0f0132012-10-04 17:16:27 -0700156static struct aoeif *
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800157ifrotate(struct aoetgt *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
Ed Cashin3f0f0132012-10-04 17:16:27 -0700159 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;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800168}
169
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800170static void
171skb_pool_put(struct aoedev *d, struct sk_buff *skb)
172{
David S. Millere9bb8fb02008-09-21 22:36:49 -0700173 __skb_queue_tail(&d->skbpool, skb);
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800174}
175
176static struct sk_buff *
177skb_pool_get(struct aoedev *d)
178{
David S. Millere9bb8fb02008-09-21 22:36:49 -0700179 struct sk_buff *skb = skb_peek(&d->skbpool);
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800180
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800181 if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
David S. Millere9bb8fb02008-09-21 22:36:49 -0700182 __skb_unlink(skb, &d->skbpool);
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800183 return skb;
184 }
David S. Millere9bb8fb02008-09-21 22:36:49 -0700185 if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
186 (skb = new_skb(ETH_ZLEN)))
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800187 return skb;
David S. Millere9bb8fb02008-09-21 22:36:49 -0700188
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800189 return NULL;
190}
191
Ed Cashin896831f2012-10-04 17:16:21 -0700192void
193aoe_freetframe(struct frame *f)
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800194{
Ed Cashin896831f2012-10-04 17:16:21 -0700195 struct aoetgt *t;
196
197 t = f->t;
198 f->buf = NULL;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700199 memset(&f->iter, 0, sizeof(f->iter));
Ed Cashin896831f2012-10-04 17:16:21 -0700200 f->r_skb = NULL;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800201 f->flags = 0;
Ed Cashin896831f2012-10-04 17:16:21 -0700202 list_add(&f->head, &t->ffree);
203}
204
205static struct frame *
206newtframe(struct aoedev *d, struct aoetgt *t)
207{
208 struct frame *f;
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800209 struct sk_buff *skb;
Ed Cashin896831f2012-10-04 17:16:21 -0700210 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) {
230bail: 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
249static struct frame *
250newframe(struct aoedev *d)
251{
252 struct frame *f;
253 struct aoetgt *t, **tt;
254 int totout = 0;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800255 int use_tainted;
256 int has_untainted;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800257
Ed Cashin71114ec2012-12-17 16:04:11 -0800258 if (!d->targets || !d->targets[0]) {
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800259 printk(KERN_ERR "aoe: NULL TARGETS!\n");
260 return NULL;
261 }
Ed Cashin896831f2012-10-04 17:16:21 -0700262 tt = d->tgt; /* last used target */
Ed Cashinbbb44e32012-12-17 16:04:08 -0800263 for (use_tainted = 0, has_untainted = 0;;) {
Ed Cashin896831f2012-10-04 17:16:21 -0700264 tt++;
Ed Cashin71114ec2012-12-17 16:04:11 -0800265 if (tt >= &d->targets[d->ntargets] || !*tt)
Ed Cashin896831f2012-10-04 17:16:21 -0700266 tt = d->targets;
267 t = *tt;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800268 if (!t->taint) {
269 has_untainted = 1;
270 totout += t->nout;
271 }
Ed Cashin896831f2012-10-04 17:16:21 -0700272 if (t->nout < t->maxout
Ed Cashinbbb44e32012-12-17 16:04:08 -0800273 && (use_tainted || !t->taint)
Ed Cashin896831f2012-10-04 17:16:21 -0700274 && t->ifp->nd) {
275 f = newtframe(d, t);
276 if (f) {
Ed Cashin896831f2012-10-04 17:16:21 -0700277 ifrotate(t);
Ed Cashin3f0f0132012-10-04 17:16:27 -0700278 d->tgt = tt;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800279 return f;
280 }
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800281 }
Ed Cashinbbb44e32012-12-17 16:04:08 -0800282 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 }
Ed Cashin896831f2012-10-04 17:16:21 -0700288 }
289 if (totout == 0) {
290 d->kicked++;
291 d->flags |= DEVFL_KICKME;
Ed L. Cashin9bb237b2008-02-08 04:20:05 -0800292 }
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800293 return NULL;
294}
295
Ed Cashin3d5b0602012-10-04 17:16:20 -0700296static void
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700297skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter)
Ed Cashin3d5b0602012-10-04 17:16:20 -0700298{
299 int frag = 0;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700300 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);
Ed Cashin3d5b0602012-10-04 17:16:20 -0700305}
306
Ed Cashin896831f2012-10-04 17:16:21 -0700307static void
308fhash(struct frame *f)
309{
Ed Cashin64a80f52012-10-04 17:16:33 -0700310 struct aoedev *d = f->t->d;
Ed Cashin896831f2012-10-04 17:16:21 -0700311 u32 n;
312
313 n = f->tag % NFACTIVE;
Ed Cashin64a80f52012-10-04 17:16:33 -0700314 list_add_tail(&f->head, &d->factive[n]);
Ed Cashin896831f2012-10-04 17:16:21 -0700315}
316
Ed Cashinbbb44e32012-12-17 16:04:08 -0800317static void
318ata_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;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800341
342 /* set up ata header */
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700343 ah->scnt = f->iter.bi_size >> 9;
344 put_lba(ah, f->iter.bi_sector);
Ed Cashinbbb44e32012-12-17 16:04:08 -0800345 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) {
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700353 skb_fillup(skb, f->buf->bio, f->iter);
Ed Cashinbbb44e32012-12-17 16:04:08 -0800354 ah->aflags |= AOEAFL_WRITE;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700355 skb->len += f->iter.bi_size;
356 skb->data_len = f->iter.bi_size;
357 skb->truesize += f->iter.bi_size;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800358 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
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800368static int
369aoecmd_ata_rw(struct aoedev *d)
370{
371 struct frame *f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 struct buf *buf;
373 struct sk_buff *skb;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700374 struct sk_buff_head queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
Ed Cashin69cf2d852012-10-04 17:16:23 -0700376 buf = nextbuf(d);
377 if (buf == NULL)
378 return 0;
Ed Cashin896831f2012-10-04 17:16:21 -0700379 f = newframe(d);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800380 if (f == NULL)
381 return 0;
Ed Cashin3d5b0602012-10-04 17:16:20 -0700382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 /* initialize the headers & frame */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 f->buf = buf;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700385 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 /* mark all tracking fields and load out */
395 buf->nframesout += 1;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700396
397 ata_rw_frameinit(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Ed Cashinbbb44e32012-12-17 16:04:08 -0800399 skb = skb_clone(f->skb, GFP_ATOMIC);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700400 if (skb) {
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800401 do_gettimeofday(&f->sent);
402 f->sent_jiffs = (u32) jiffies;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700403 __skb_queue_head_init(&queue);
404 __skb_queue_tail(&queue, skb);
405 aoenet_xmit(&queue);
406 }
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800407 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500410/* some callers cannot sleep, and they can call this function,
411 * transmitting the packets later, when interrupts are on
412 */
David S. Millere9bb8fb02008-09-21 22:36:49 -0700413static void
414aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500415{
416 struct aoe_hdr *h;
417 struct aoe_cfghdr *ch;
David S. Millere9bb8fb02008-09-21 22:36:49 -0700418 struct sk_buff *skb;
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500419 struct net_device *ifp;
420
Eric Dumazet840a1852010-10-29 01:15:29 +0000421 rcu_read_lock();
422 for_each_netdev_rcu(&init_net, ifp) {
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500423 dev_hold(ifp);
424 if (!is_aoe_netif(ifp))
Pavel Emelianov7562f872007-05-03 15:13:45 -0700425 goto cont;
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500426
Ed L. Cashine407a7f2006-09-20 14:36:49 -0400427 skb = new_skb(sizeof *h + sizeof *ch);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500428 if (skb == NULL) {
Ed L. Cashina12c93f2006-09-20 14:36:51 -0400429 printk(KERN_INFO "aoe: skb alloc failure\n");
Pavel Emelianov7562f872007-05-03 15:13:45 -0700430 goto cont;
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500431 }
Ed L. Cashin19900cd2006-12-22 01:09:21 -0800432 skb_put(skb, sizeof *h + sizeof *ch);
Ed L. Cashine407a7f2006-09-20 14:36:49 -0400433 skb->dev = ifp;
David S. Millere9bb8fb02008-09-21 22:36:49 -0700434 __skb_queue_tail(queue, skb);
Ed L. Cashinabdbf942007-10-16 23:27:03 -0700435 h = (struct aoe_hdr *) skb_mac_header(skb);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500436 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
Pavel Emelianov7562f872007-05-03 15:13:45 -0700446cont:
447 dev_put(ifp);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500448 }
Eric Dumazet840a1852010-10-29 01:15:29 +0000449 rcu_read_unlock();
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500450}
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452static void
Ed Cashin896831f2012-10-04 17:16:21 -0700453resend(struct aoedev *d, struct frame *f)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
455 struct sk_buff *skb;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700456 struct sk_buff_head queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct aoe_hdr *h;
Ed Cashin896831f2012-10-04 17:16:21 -0700458 struct aoetgt *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 char buf[128];
460 u32 n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Ed Cashin896831f2012-10-04 17:16:21 -0700462 t = f->t;
Ed Cashin64a80f52012-10-04 17:16:33 -0700463 n = newtag(d);
Ed L. Cashine407a7f2006-09-20 14:36:49 -0400464 skb = f->skb;
Ed Cashin3f0f0132012-10-04 17:16:27 -0700465 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 }
Ed L. Cashinabdbf942007-10-16 23:27:03 -0700471 h = (struct aoe_hdr *) skb_mac_header(skb);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800472
Ed Cashinbbb44e32012-12-17 16:04:08 -0800473 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 }
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 f->tag = n;
Ed Cashin896831f2012-10-04 17:16:21 -0700483 fhash(f);
ecashin@coraid.com63e9cc52005-04-18 22:00:20 -0700484 h->tag = cpu_to_be32(n);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800485 memcpy(h->dst, t->addr, sizeof h->dst);
486 memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800488 skb->dev = t->ifp->nd;
Ed L. Cashin4f51dc52006-09-20 14:36:49 -0400489 skb = skb_clone(skb, GFP_ATOMIC);
490 if (skb == NULL)
491 return;
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800492 do_gettimeofday(&f->sent);
493 f->sent_jiffs = (u32) jiffies;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700494 __skb_queue_head_init(&queue);
495 __skb_queue_tail(&queue, skb);
496 aoenet_xmit(&queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497}
498
499static int
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800500tsince_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
531static int
Ed Cashin896831f2012-10-04 17:16:21 -0700532tsince(u32 tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533{
534 int n;
535
536 n = jiffies & 0xffff;
537 n -= tag & 0xffff;
538 if (n < 0)
539 n += 1<<16;
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800540 return jiffies_to_usecs(n + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800543static struct aoeif *
544getif(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
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800556static void
557ejectif(struct aoetgt *t, struct aoeif *ifp)
558{
559 struct aoeif *e;
Ed Cashin1b86fda2012-10-04 17:16:34 -0700560 struct net_device *nd;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800561 ulong n;
562
Ed Cashin1b86fda2012-10-04 17:16:34 -0700563 nd = ifp->nd;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800564 e = t->ifs + NAOEIFS - 1;
565 n = (e - ifp) * sizeof *ifp;
566 memmove(ifp, ifp+1, n);
567 e->nd = NULL;
Ed Cashin1b86fda2012-10-04 17:16:34 -0700568 dev_put(nd);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800569}
570
Ed Cashin3fc9b032012-12-17 16:03:51 -0800571static struct frame *
Ed Cashinbbb44e32012-12-17 16:04:08 -0800572reassign_frame(struct frame *f)
Ed Cashin3fc9b032012-12-17 16:03:51 -0800573{
Ed Cashin3fc9b032012-12-17 16:03:51 -0800574 struct frame *nf;
575 struct sk_buff *skb;
576
Ed Cashin3fc9b032012-12-17 16:03:51 -0800577 nf = newframe(f->t->d);
578 if (!nf)
579 return NULL;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800580 if (nf->t == f->t) {
581 aoe_freetframe(nf);
582 return NULL;
583 }
Ed Cashin3fc9b032012-12-17 16:03:51 -0800584
585 skb = nf->skb;
586 nf->skb = f->skb;
587 nf->buf = f->buf;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700588 nf->iter = f->iter;
Ed Cashin3fc9b032012-12-17 16:03:51 -0800589 nf->waited = 0;
590 nf->waited_total = f->waited_total;
591 nf->sent = f->sent;
Ed Cashinfe7252b2012-12-17 16:03:55 -0800592 nf->sent_jiffs = f->sent_jiffs;
Ed Cashin3fc9b032012-12-17 16:03:51 -0800593 f->skb = skb;
Ed Cashin3fc9b032012-12-17 16:03:51 -0800594
595 return nf;
596}
597
Ed Cashinbbb44e32012-12-17 16:04:08 -0800598static void
599probe(struct aoetgt *t)
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800600{
Ed Cashinbbb44e32012-12-17 16:04:08 -0800601 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;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800607
Ed Cashinbbb44e32012-12-17 16:04:08 -0800608 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;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800617 }
Ed Cashinbbb44e32012-12-17 16:04:08 -0800618 f->flags |= FFL_PROBE;
619 ifrotate(t);
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700620 f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800621 ata_rw_frameinit(f);
622 skb = f->skb;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700623 for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) {
Ed Cashinbbb44e32012-12-17 16:04:08 -0800624 if (n < PAGE_SIZE)
625 m = n;
626 else
627 m = PAGE_SIZE;
628 skb_fill_page_desc(skb, frag, empty_page, 0, m);
Ed Cashin3fc9b032012-12-17 16:03:51 -0800629 }
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700630 skb->len += f->iter.bi_size;
631 skb->data_len = f->iter.bi_size;
632 skb->truesize += f->iter.bi_size;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800633
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
644static long
645rto(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;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800655}
656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657static void
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800658rexmit_deferred(struct aoedev *d)
659{
660 struct aoetgt *t;
661 struct frame *f;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800662 struct frame *nf;
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800663 struct list_head *pos, *nx, *head;
Ed Cashin3fc9b032012-12-17 16:03:51 -0800664 int since;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800665 int untainted;
666
667 count_targets(d, &untainted);
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800668
669 head = &d->rexmitq;
670 list_for_each_safe(pos, nx, head) {
671 f = list_entry(pos, struct frame, head);
672 t = f->t;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800673 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) {
696stop_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 }
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800703 if (t->nout >= t->maxout)
704 continue;
705 list_del(pos);
706 t->nout++;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800707 if (f->flags & FFL_PROBE)
708 t->nout_probes++;
Ed Cashin3fc9b032012-12-17 16:03:51 -0800709 since = tsince_hr(f);
710 f->waited += since;
711 f->waited_total += since;
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800712 resend(d, f);
713 }
714}
715
Ed Cashinbbb44e32012-12-17 16:04:08 -0800716/* An aoetgt accumulates demerits quickly, and successful
717 * probing redeems the aoetgt slowly.
718 */
719static void
720scorn(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
732static int
733count_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
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800746static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747rexmit_timer(ulong vp)
748{
749 struct aoedev *d;
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800750 struct aoetgt *t;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800751 struct aoeif *ifp;
Ed Cashin896831f2012-10-04 17:16:21 -0700752 struct frame *f;
753 struct list_head *head, *pos, *nx;
754 LIST_HEAD(flist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 register long timeout;
756 ulong flags, n;
Ed Cashin896831f2012-10-04 17:16:21 -0700757 int i;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800758 int utgts; /* number of aoetgt descriptors (not slots) */
Ed Cashin3fc9b032012-12-17 16:03:51 -0800759 int since;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
761 d = (struct aoedev *) vp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Ed Cashin0d555ec2012-12-17 16:03:47 -0800763 spin_lock_irqsave(&d->lock, flags);
764
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800765 /* timeout based on observed timings and variations */
Ed Cashinbbb44e32012-12-17 16:04:08 -0800766 timeout = rto(d);
767
768 utgts = count_targets(d, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (d->flags & DEVFL_TKILL) {
Ed L. Cashin1c6f3fc2006-01-25 13:54:44 -0500771 spin_unlock_irqrestore(&d->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 return;
773 }
Ed Cashin896831f2012-10-04 17:16:21 -0700774
775 /* collect all frames to rexmit into flist */
Ed Cashin64a80f52012-10-04 17:16:33 -0700776 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);
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800780 if (tsince_hr(f) < timeout)
Ed Cashin64a80f52012-10-04 17:16:33 -0700781 break; /* end of expired frames */
782 /* move to flist for later processing */
783 list_move_tail(pos, &flist);
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800784 }
Ed Cashin64a80f52012-10-04 17:16:33 -0700785 }
Ed Cashin69cf2d852012-10-04 17:16:23 -0700786
Ed Cashin896831f2012-10-04 17:16:21 -0700787 /* process expired frames */
788 while (!list_empty(&flist)) {
789 pos = flist.next;
790 f = list_entry(pos, struct frame, head);
Ed Cashin3fc9b032012-12-17 16:03:51 -0800791 since = tsince_hr(f);
792 n = f->waited_total + since;
Ed Cashin5f0c9c42012-12-17 16:03:49 -0800793 n /= USEC_PER_SEC;
Ed Cashinc450ba02012-12-17 16:04:14 -0800794 if (aoe_deadsecs
795 && n > aoe_deadsecs
796 && !(f->flags & FFL_PROBE)) {
Ed Cashin896831f2012-10-04 17:16:21 -0700797 /* Waited too long. Device failure.
798 * Hang all frames on first hash bucket for downdev
799 * to clean up.
800 */
Ed Cashin64a80f52012-10-04 17:16:33 -0700801 list_splice(&flist, &d->factive[0]);
Ed Cashin896831f2012-10-04 17:16:21 -0700802 aoedev_downdev(d);
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800803 goto out;
Ed Cashin896831f2012-10-04 17:16:21 -0700804 }
Ed Cashin896831f2012-10-04 17:16:21 -0700805
806 t = f->t;
Ed Cashinbbb44e32012-12-17 16:04:08 -0800807 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 */
Ed Cashind54d35a2012-10-04 17:16:29 -0700812
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800813 if (t->maxout != 1) {
814 t->ssthresh = t->maxout / 2;
815 t->maxout = 1;
Ed Cashin896831f2012-10-04 17:16:21 -0700816 }
817
Ed Cashinbbb44e32012-12-17 16:04:08 -0800818 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 }
Ed Cashin896831f2012-10-04 17:16:21 -0700827 }
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800828 list_move_tail(pos, &d->rexmitq);
829 t->nout--;
Ed Cashin896831f2012-10-04 17:16:21 -0700830 }
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800831 rexmit_deferred(d);
Ed Cashin896831f2012-10-04 17:16:21 -0700832
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800833out:
Ed Cashinbbb44e32012-12-17 16:04:08 -0800834 if ((d->flags & DEVFL_KICKME) && d->blkq) {
Ed L. Cashin4f51dc52006-09-20 14:36:49 -0400835 d->flags &= ~DEVFL_KICKME;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700836 d->blkq->request_fn(d->blkq);
Ed L. Cashin4f51dc52006-09-20 14:36:49 -0400837 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 d->timer.expires = jiffies + TIMERTICK;
840 add_timer(&d->timer);
841
842 spin_unlock_irqrestore(&d->lock, flags);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700843}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
Ed Cashin69cf2d852012-10-04 17:16:23 -0700845static unsigned long
846rqbiocnt(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
856/* This can be removed if we are certain that no users of the block
857 * layer will ever use zero-count pages in bios. Otherwise we have to
858 * protect against the put_page sometimes done by the network layer.
859 *
860 * See http://oss.sgi.com/archives/xfs/2007-01/msg00594.html for
861 * discussion.
862 *
863 * We cannot use get_page in the workaround, because it insists on a
864 * positive page count as a precondition. So we use _count directly.
865 */
866static void
867bio_pageinc(struct bio *bio)
868{
Kent Overstreet79886132013-11-23 17:19:00 -0800869 struct bio_vec bv;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700870 struct page *page;
Kent Overstreet79886132013-11-23 17:19:00 -0800871 struct bvec_iter iter;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700872
Kent Overstreet79886132013-11-23 17:19:00 -0800873 bio_for_each_segment(bv, bio, iter) {
Ed Cashin69cf2d852012-10-04 17:16:23 -0700874 /* Non-zero page count for non-head members of
Ed Cashinfb32975d2013-08-13 16:00:53 -0700875 * compound pages is no longer allowed by the kernel.
Ed Cashin69cf2d852012-10-04 17:16:23 -0700876 */
David Rientjes668f9abb2014-03-03 15:38:18 -0800877 page = compound_head(bv.bv_page);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700878 atomic_inc(&page->_count);
879 }
880}
881
882static void
883bio_pagedec(struct bio *bio)
884{
Ed Cashinfb32975d2013-08-13 16:00:53 -0700885 struct page *page;
Kent Overstreet79886132013-11-23 17:19:00 -0800886 struct bio_vec bv;
887 struct bvec_iter iter;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700888
Kent Overstreet79886132013-11-23 17:19:00 -0800889 bio_for_each_segment(bv, bio, iter) {
David Rientjes668f9abb2014-03-03 15:38:18 -0800890 page = compound_head(bv.bv_page);
Ed Cashinfb32975d2013-08-13 16:00:53 -0700891 atomic_dec(&page->_count);
892 }
Ed Cashin69cf2d852012-10-04 17:16:23 -0700893}
894
895static void
896bufinit(struct buf *buf, struct request *rq, struct bio *bio)
897{
Ed Cashin69cf2d852012-10-04 17:16:23 -0700898 memset(buf, 0, sizeof(*buf));
899 buf->rq = rq;
900 buf->bio = bio;
Kent Overstreetfeb261e2013-08-13 11:41:43 -0700901 buf->iter = bio->bi_iter;
Ed Cashin69cf2d852012-10-04 17:16:23 -0700902 bio_pageinc(bio);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700903}
904
905static struct buf *
906nextbuf(struct aoedev *d)
907{
908 struct request *rq;
909 struct request_queue *q;
910 struct buf *buf;
911 struct bio *bio;
912
913 q = d->blkq;
914 if (q == NULL)
915 return NULL; /* initializing */
916 if (d->ip.buf)
917 return d->ip.buf;
918 rq = d->ip.rq;
919 if (rq == NULL) {
920 rq = blk_peek_request(q);
921 if (rq == NULL)
922 return NULL;
923 blk_start_request(rq);
924 d->ip.rq = rq;
925 d->ip.nxbio = rq->bio;
926 rq->special = (void *) rqbiocnt(rq);
927 }
928 buf = mempool_alloc(d->bufpool, GFP_ATOMIC);
929 if (buf == NULL) {
930 pr_err("aoe: nextbuf: unable to mempool_alloc!\n");
931 return NULL;
932 }
933 bio = d->ip.nxbio;
934 bufinit(buf, rq, bio);
935 bio = bio->bi_next;
936 d->ip.nxbio = bio;
937 if (bio == NULL)
938 d->ip.rq = NULL;
939 return d->ip.buf = buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940}
941
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800942/* enters with d->lock held */
943void
944aoecmd_work(struct aoedev *d)
945{
Ed Cashin3a0c40d2012-12-17 16:03:43 -0800946 rexmit_deferred(d);
Ed Cashin69cf2d852012-10-04 17:16:23 -0700947 while (aoecmd_ata_rw(d))
948 ;
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800949}
950
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500951/* this function performs work that has been deferred until sleeping is OK
952 */
953void
David Howellsc4028952006-11-22 14:57:56 +0000954aoecmd_sleepwork(struct work_struct *work)
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500955{
David Howellsc4028952006-11-22 14:57:56 +0000956 struct aoedev *d = container_of(work, struct aoedev, work);
Ed Cashinb21faa22012-10-04 17:16:35 -0700957 struct block_device *bd;
958 u64 ssize;
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500959
960 if (d->flags & DEVFL_GDALLOC)
961 aoeblk_gdalloc(d);
962
963 if (d->flags & DEVFL_NEWSIZE) {
Tejun Heo80795ae2008-08-25 19:56:07 +0900964 ssize = get_capacity(d->gd);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500965 bd = bdget_disk(d->gd, 0);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500966 if (bd) {
967 mutex_lock(&bd->bd_inode->i_mutex);
968 i_size_write(bd->bd_inode, (loff_t)ssize<<9);
969 mutex_unlock(&bd->bd_inode->i_mutex);
970 bdput(bd);
971 }
Ed Cashinb21faa22012-10-04 17:16:35 -0700972 spin_lock_irq(&d->lock);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500973 d->flags |= DEVFL_UP;
974 d->flags &= ~DEVFL_NEWSIZE;
Ed Cashinb21faa22012-10-04 17:16:35 -0700975 spin_unlock_irq(&d->lock);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -0500976 }
977}
978
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979static void
Ed Cashin667be1e2012-12-17 16:03:42 -0800980ata_ident_fixstring(u16 *id, int ns)
981{
982 u16 s;
983
984 while (ns-- > 0) {
985 s = *id;
986 *id++ = s >> 8 | s << 8;
987 }
988}
989
990static void
Ed L. Cashin68e0d422008-02-08 04:20:00 -0800991ataid_complete(struct aoedev *d, struct aoetgt *t, unsigned char *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992{
993 u64 ssize;
994 u16 n;
995
996 /* word 83: command set supported */
Harvey Harrisonf885f8d2008-04-29 01:03:30 -0700997 n = get_unaligned_le16(&id[83 << 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 /* word 86: command set/feature enabled */
Harvey Harrisonf885f8d2008-04-29 01:03:30 -07001000 n |= get_unaligned_le16(&id[86 << 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 if (n & (1<<10)) { /* bit 10: LBA 48 */
1003 d->flags |= DEVFL_EXT;
1004
1005 /* word 100: number lba48 sectors */
Harvey Harrisonf885f8d2008-04-29 01:03:30 -07001006 ssize = get_unaligned_le64(&id[100 << 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
1008 /* set as in ide-disk.c:init_idedisk_capacity */
1009 d->geo.cylinders = ssize;
1010 d->geo.cylinders /= (255 * 63);
1011 d->geo.heads = 255;
1012 d->geo.sectors = 63;
1013 } else {
1014 d->flags &= ~DEVFL_EXT;
1015
1016 /* number lba28 sectors */
Harvey Harrisonf885f8d2008-04-29 01:03:30 -07001017 ssize = get_unaligned_le32(&id[60 << 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
1019 /* NOTE: obsolete in ATA 6 */
Harvey Harrisonf885f8d2008-04-29 01:03:30 -07001020 d->geo.cylinders = get_unaligned_le16(&id[54 << 1]);
1021 d->geo.heads = get_unaligned_le16(&id[55 << 1]);
1022 d->geo.sectors = get_unaligned_le16(&id[56 << 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 }
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001024
Ed Cashin667be1e2012-12-17 16:03:42 -08001025 ata_ident_fixstring((u16 *) &id[10<<1], 10); /* serial */
1026 ata_ident_fixstring((u16 *) &id[23<<1], 4); /* firmware */
1027 ata_ident_fixstring((u16 *) &id[27<<1], 20); /* model */
1028 memcpy(d->ident, id, sizeof(d->ident));
1029
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001030 if (d->ssize != ssize)
Ed L. Cashin1d759812008-02-08 04:20:08 -08001031 printk(KERN_INFO
Harvey Harrison411c41e2008-11-25 00:40:37 -08001032 "aoe: %pm e%ld.%d v%04x has %llu sectors\n",
1033 t->addr,
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001034 d->aoemajor, d->aoeminor,
1035 d->fw_ver, (long long)ssize);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 d->ssize = ssize;
1037 d->geo.start = 0;
Ed L. Cashin6b9699b2008-02-08 04:20:06 -08001038 if (d->flags & (DEVFL_GDALLOC|DEVFL_NEWSIZE))
1039 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 if (d->gd != NULL) {
Tejun Heo80795ae2008-08-25 19:56:07 +09001041 set_capacity(d->gd, ssize);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001042 d->flags |= DEVFL_NEWSIZE;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001043 } else
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001044 d->flags |= DEVFL_GDALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 schedule_work(&d->work);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046}
1047
1048static void
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001049calc_rttavg(struct aoedev *d, struct aoetgt *t, int rtt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
1051 register long n;
1052
1053 n = rtt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001055 /* cf. Congestion Avoidance and Control, Jacobson & Karels, 1988 */
1056 n -= d->rttavg >> RTTSCALE;
1057 d->rttavg += n;
1058 if (n < 0)
1059 n = -n;
1060 n -= d->rttdev >> RTTDSCALE;
1061 d->rttdev += n;
1062
1063 if (!t || t->maxout >= t->nframes)
1064 return;
1065 if (t->maxout < t->ssthresh)
1066 t->maxout += 1;
1067 else if (t->nout == t->maxout && t->next_cwnd-- == 0) {
1068 t->maxout += 1;
1069 t->next_cwnd = t->maxout;
1070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071}
1072
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001073static struct aoetgt *
1074gettgt(struct aoedev *d, char *addr)
1075{
1076 struct aoetgt **t, **e;
1077
1078 t = d->targets;
Ed Cashin71114ec2012-12-17 16:04:11 -08001079 e = t + d->ntargets;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001080 for (; t < e && *t; t++)
1081 if (memcmp((*t)->addr, addr, sizeof((*t)->addr)) == 0)
1082 return *t;
1083 return NULL;
1084}
1085
Ed Cashin3d5b0602012-10-04 17:16:20 -07001086static void
Kent Overstreetfeb261e2013-08-13 11:41:43 -07001087bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt)
Ed Cashin3d5b0602012-10-04 17:16:20 -07001088{
Ed Cashin3d5b0602012-10-04 17:16:20 -07001089 int soff = 0;
Kent Overstreetfeb261e2013-08-13 11:41:43 -07001090 struct bio_vec bv;
1091
1092 iter.bi_size = cnt;
1093
1094 __bio_for_each_segment(bv, bio, iter, iter) {
1095 char *p = page_address(bv.bv_page) + bv.bv_offset;
1096 skb_copy_bits(skb, soff, p, bv.bv_len);
1097 soff += bv.bv_len;
1098 }
Ed Cashin3d5b0602012-10-04 17:16:20 -07001099}
1100
Ed Cashin69cf2d852012-10-04 17:16:23 -07001101void
1102aoe_end_request(struct aoedev *d, struct request *rq, int fastfail)
1103{
1104 struct bio *bio;
1105 int bok;
1106 struct request_queue *q;
1107
1108 q = d->blkq;
1109 if (rq == d->ip.rq)
1110 d->ip.rq = NULL;
1111 do {
1112 bio = rq->bio;
1113 bok = !fastfail && test_bit(BIO_UPTODATE, &bio->bi_flags);
Kent Overstreet4f024f32013-10-11 15:44:27 -07001114 } while (__blk_end_request(rq, bok ? 0 : -EIO, bio->bi_iter.bi_size));
Ed Cashin69cf2d852012-10-04 17:16:23 -07001115
1116 /* cf. http://lkml.org/lkml/2006/10/31/28 */
1117 if (!fastfail)
Ed Cashin11cfb6f2012-11-08 19:17:15 -05001118 __blk_run_queue(q);
Ed Cashin69cf2d852012-10-04 17:16:23 -07001119}
1120
1121static void
1122aoe_end_buf(struct aoedev *d, struct buf *buf)
1123{
1124 struct request *rq;
1125 unsigned long n;
1126
1127 if (buf == d->ip.buf)
1128 d->ip.buf = NULL;
1129 rq = buf->rq;
1130 bio_pagedec(buf->bio);
1131 mempool_free(buf, d->bufpool);
1132 n = (unsigned long) rq->special;
1133 rq->special = (void *) --n;
1134 if (n == 0)
1135 aoe_end_request(d, rq, 0);
1136}
1137
Ed Cashin3d5b0602012-10-04 17:16:20 -07001138static void
Ed Cashin896831f2012-10-04 17:16:21 -07001139ktiocomplete(struct frame *f)
Ed Cashin3d5b0602012-10-04 17:16:20 -07001140{
Ed L. Cashinddec63e2006-09-20 14:36:49 -04001141 struct aoe_hdr *hin, *hout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 struct aoe_atahdr *ahin, *ahout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 struct buf *buf;
Ed Cashin896831f2012-10-04 17:16:21 -07001144 struct sk_buff *skb;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001145 struct aoetgt *t;
1146 struct aoeif *ifp;
Ed Cashin896831f2012-10-04 17:16:21 -07001147 struct aoedev *d;
1148 long n;
Ed Cashinbbb44e32012-12-17 16:04:08 -08001149 int untainted;
Ed Cashin896831f2012-10-04 17:16:21 -07001150
1151 if (f == NULL)
1152 return;
1153
1154 t = f->t;
1155 d = t->d;
Ed Cashinbbb44e32012-12-17 16:04:08 -08001156 skb = f->r_skb;
1157 buf = f->buf;
1158 if (f->flags & FFL_PROBE)
1159 goto out;
1160 if (!skb) /* just fail the buf. */
1161 goto noskb;
Ed Cashin896831f2012-10-04 17:16:21 -07001162
1163 hout = (struct aoe_hdr *) skb_mac_header(f->skb);
1164 ahout = (struct aoe_atahdr *) (hout+1);
Ed Cashin896831f2012-10-04 17:16:21 -07001165
1166 hin = (struct aoe_hdr *) skb->data;
1167 skb_pull(skb, sizeof(*hin));
1168 ahin = (struct aoe_atahdr *) skb->data;
1169 skb_pull(skb, sizeof(*ahin));
1170 if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
1171 pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
1172 ahout->cmdstat, ahin->cmdstat,
1173 d->aoemajor, d->aoeminor);
Ed Cashina04b41c2012-12-17 16:03:39 -08001174noskb: if (buf)
Ed Cashin69cf2d852012-10-04 17:16:23 -07001175 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
Ed Cashinbbb44e32012-12-17 16:04:08 -08001176 goto out;
Ed Cashin896831f2012-10-04 17:16:21 -07001177 }
1178
1179 n = ahout->scnt << 9;
1180 switch (ahout->cmdstat) {
1181 case ATA_CMD_PIO_READ:
1182 case ATA_CMD_PIO_READ_EXT:
1183 if (skb->len < n) {
Ed Cashinbf297542012-12-17 16:04:17 -08001184 pr_err("%s e%ld.%d. skb->len=%d need=%ld\n",
1185 "aoe: runt data size in read from",
1186 (long) d->aoemajor, d->aoeminor,
1187 skb->len, n);
Ed Cashin69cf2d852012-10-04 17:16:23 -07001188 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
Ed Cashin896831f2012-10-04 17:16:21 -07001189 break;
1190 }
Kent Overstreetfeb261e2013-08-13 11:41:43 -07001191 if (n > f->iter.bi_size) {
1192 pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n",
1193 "aoe: too-large data size in read from",
1194 (long) d->aoemajor, d->aoeminor,
1195 n, f->iter.bi_size);
1196 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
1197 break;
1198 }
1199 bvcpy(skb, f->buf->bio, f->iter, n);
Ed Cashin896831f2012-10-04 17:16:21 -07001200 case ATA_CMD_PIO_WRITE:
1201 case ATA_CMD_PIO_WRITE_EXT:
1202 spin_lock_irq(&d->lock);
1203 ifp = getif(t, skb->dev);
Ed Cashin3f0f0132012-10-04 17:16:27 -07001204 if (ifp)
Ed Cashin896831f2012-10-04 17:16:21 -07001205 ifp->lost = 0;
Ed Cashin896831f2012-10-04 17:16:21 -07001206 spin_unlock_irq(&d->lock);
1207 break;
1208 case ATA_CMD_ID_ATA:
1209 if (skb->len < 512) {
Ed Cashinbf297542012-12-17 16:04:17 -08001210 pr_info("%s e%ld.%d. skb->len=%d need=512\n",
1211 "aoe: runt data size in ataid from",
1212 (long) d->aoemajor, d->aoeminor,
Ed Cashin896831f2012-10-04 17:16:21 -07001213 skb->len);
1214 break;
1215 }
1216 if (skb_linearize(skb))
1217 break;
1218 spin_lock_irq(&d->lock);
1219 ataid_complete(d, t, skb->data);
1220 spin_unlock_irq(&d->lock);
1221 break;
1222 default:
1223 pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
1224 ahout->cmdstat,
1225 be16_to_cpu(get_unaligned(&hin->major)),
1226 hin->minor);
1227 }
Ed Cashinbbb44e32012-12-17 16:04:08 -08001228out:
Ed Cashin896831f2012-10-04 17:16:21 -07001229 spin_lock_irq(&d->lock);
Ed Cashinbbb44e32012-12-17 16:04:08 -08001230 if (t->taint > 0
1231 && --t->taint > 0
1232 && t->nout_probes == 0) {
1233 count_targets(d, &untainted);
1234 if (untainted > 0) {
1235 probe(t);
1236 t->nout_probes++;
1237 }
1238 }
Ed Cashin896831f2012-10-04 17:16:21 -07001239
1240 aoe_freetframe(f);
1241
Kent Overstreetfeb261e2013-08-13 11:41:43 -07001242 if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0)
Ed Cashin69cf2d852012-10-04 17:16:23 -07001243 aoe_end_buf(d, buf);
Ed Cashin896831f2012-10-04 17:16:21 -07001244
Ed Cashin69cf2d852012-10-04 17:16:23 -07001245 spin_unlock_irq(&d->lock);
1246 aoedev_put(d);
Ed Cashin896831f2012-10-04 17:16:21 -07001247 dev_kfree_skb(skb);
1248}
1249
1250/* Enters with iocq.lock held.
1251 * Returns true iff responses needing processing remain.
1252 */
1253static int
Ed Cashin8030d342013-07-03 15:09:05 -07001254ktio(int id)
Ed Cashin896831f2012-10-04 17:16:21 -07001255{
1256 struct frame *f;
1257 struct list_head *pos;
1258 int i;
Ed Cashin8030d342013-07-03 15:09:05 -07001259 int actual_id;
Ed Cashin896831f2012-10-04 17:16:21 -07001260
1261 for (i = 0; ; ++i) {
1262 if (i == MAXIOC)
1263 return 1;
Ed Cashin8030d342013-07-03 15:09:05 -07001264 if (list_empty(&iocq[id].head))
Ed Cashin896831f2012-10-04 17:16:21 -07001265 return 0;
Ed Cashin8030d342013-07-03 15:09:05 -07001266 pos = iocq[id].head.next;
Ed Cashin896831f2012-10-04 17:16:21 -07001267 list_del(pos);
Ed Cashin896831f2012-10-04 17:16:21 -07001268 f = list_entry(pos, struct frame, head);
Ed Cashin8030d342013-07-03 15:09:05 -07001269 spin_unlock_irq(&iocq[id].lock);
Ed Cashin896831f2012-10-04 17:16:21 -07001270 ktiocomplete(f);
Ed Cashin8030d342013-07-03 15:09:05 -07001271
1272 /* Figure out if extra threads are required. */
1273 actual_id = f->t->d->aoeminor % ncpus;
1274
1275 if (!kts[actual_id].active) {
1276 BUG_ON(id != 0);
1277 mutex_lock(&ktio_spawn_lock);
1278 if (!kts[actual_id].active
1279 && aoe_ktstart(&kts[actual_id]) == 0)
1280 kts[actual_id].active = 1;
1281 mutex_unlock(&ktio_spawn_lock);
1282 }
1283 spin_lock_irq(&iocq[id].lock);
Ed Cashin896831f2012-10-04 17:16:21 -07001284 }
1285}
1286
1287static int
1288kthread(void *vp)
1289{
1290 struct ktstate *k;
1291 DECLARE_WAITQUEUE(wait, current);
1292 int more;
1293
1294 k = vp;
1295 current->flags |= PF_NOFREEZE;
1296 set_user_nice(current, -10);
1297 complete(&k->rendez); /* tell spawner we're running */
1298 do {
1299 spin_lock_irq(k->lock);
Ed Cashin8030d342013-07-03 15:09:05 -07001300 more = k->fn(k->id);
Ed Cashin896831f2012-10-04 17:16:21 -07001301 if (!more) {
1302 add_wait_queue(k->waitq, &wait);
1303 __set_current_state(TASK_INTERRUPTIBLE);
1304 }
1305 spin_unlock_irq(k->lock);
1306 if (!more) {
1307 schedule();
1308 remove_wait_queue(k->waitq, &wait);
1309 } else
1310 cond_resched();
1311 } while (!kthread_should_stop());
1312 complete(&k->rendez); /* tell spawner we're stopping */
1313 return 0;
1314}
1315
Ed Cashineb086ec2012-10-04 17:16:25 -07001316void
Ed Cashin896831f2012-10-04 17:16:21 -07001317aoe_ktstop(struct ktstate *k)
1318{
1319 kthread_stop(k->task);
1320 wait_for_completion(&k->rendez);
1321}
1322
Ed Cashineb086ec2012-10-04 17:16:25 -07001323int
Ed Cashin896831f2012-10-04 17:16:21 -07001324aoe_ktstart(struct ktstate *k)
1325{
1326 struct task_struct *task;
1327
1328 init_completion(&k->rendez);
Kees Cookf1701682013-07-03 15:04:58 -07001329 task = kthread_run(kthread, k, "%s", k->name);
Ed Cashin896831f2012-10-04 17:16:21 -07001330 if (task == NULL || IS_ERR(task))
1331 return -ENOMEM;
1332 k->task = task;
1333 wait_for_completion(&k->rendez); /* allow kthread to start */
1334 init_completion(&k->rendez); /* for waiting for exit later */
1335 return 0;
1336}
1337
1338/* pass it off to kthreads for processing */
1339static void
1340ktcomplete(struct frame *f, struct sk_buff *skb)
1341{
Ed Cashin8030d342013-07-03 15:09:05 -07001342 int id;
Ed Cashin896831f2012-10-04 17:16:21 -07001343 ulong flags;
1344
1345 f->r_skb = skb;
Ed Cashin8030d342013-07-03 15:09:05 -07001346 id = f->t->d->aoeminor % ncpus;
1347 spin_lock_irqsave(&iocq[id].lock, flags);
1348 if (!kts[id].active) {
1349 spin_unlock_irqrestore(&iocq[id].lock, flags);
1350 /* The thread with id has not been spawned yet,
1351 * so delegate the work to the main thread and
1352 * try spawning a new thread.
1353 */
1354 id = 0;
1355 spin_lock_irqsave(&iocq[id].lock, flags);
1356 }
1357 list_add_tail(&f->head, &iocq[id].head);
1358 spin_unlock_irqrestore(&iocq[id].lock, flags);
1359 wake_up(&ktiowq[id]);
Ed Cashin896831f2012-10-04 17:16:21 -07001360}
1361
1362struct sk_buff *
1363aoecmd_ata_rsp(struct sk_buff *skb)
1364{
1365 struct aoedev *d;
1366 struct aoe_hdr *h;
1367 struct frame *f;
Ed Cashin896831f2012-10-04 17:16:21 -07001368 u32 n;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 ulong flags;
1370 char ebuf[128];
ecashin@coraid.com32465c62005-04-18 22:00:18 -07001371 u16 aoemajor;
1372
Ed Cashin896831f2012-10-04 17:16:21 -07001373 h = (struct aoe_hdr *) skb->data;
1374 aoemajor = be16_to_cpu(get_unaligned(&h->major));
Ed Cashin0c966212012-10-04 17:16:40 -07001375 d = aoedev_by_aoeaddr(aoemajor, h->minor, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 if (d == NULL) {
1377 snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
1378 "for unknown device %d.%d\n",
Ed Cashin896831f2012-10-04 17:16:21 -07001379 aoemajor, h->minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 aoechr_error(ebuf);
Ed Cashin896831f2012-10-04 17:16:21 -07001381 return skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 }
1383
1384 spin_lock_irqsave(&d->lock, flags);
1385
Ed Cashin896831f2012-10-04 17:16:21 -07001386 n = be32_to_cpu(get_unaligned(&h->tag));
Ed Cashin64a80f52012-10-04 17:16:33 -07001387 f = getframe(d, n);
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001388 if (f) {
Ed Cashin5f0c9c42012-12-17 16:03:49 -08001389 calc_rttavg(d, f->t, tsince_hr(f));
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001390 f->t->nout--;
Ed Cashinbbb44e32012-12-17 16:04:08 -08001391 if (f->flags & FFL_PROBE)
1392 f->t->nout_probes--;
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001393 } else {
1394 f = getframe_deferred(d, n);
1395 if (f) {
Ed Cashin5f0c9c42012-12-17 16:03:49 -08001396 calc_rttavg(d, NULL, tsince_hr(f));
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001397 } else {
1398 calc_rttavg(d, NULL, tsince(n));
1399 spin_unlock_irqrestore(&d->lock, flags);
1400 aoedev_put(d);
1401 snprintf(ebuf, sizeof(ebuf),
Ed Cashin2292a7e2012-12-17 16:03:45 -08001402 "%15s e%d.%d tag=%08x@%08lx s=%pm d=%pm\n",
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001403 "unexpected rsp",
1404 get_unaligned_be16(&h->major),
1405 h->minor,
1406 get_unaligned_be32(&h->tag),
Ed Cashin2292a7e2012-12-17 16:03:45 -08001407 jiffies,
1408 h->src,
1409 h->dst);
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001410 aoechr_error(ebuf);
1411 return skb;
1412 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 aoecmd_work(d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
1416 spin_unlock_irqrestore(&d->lock, flags);
Ed Cashin896831f2012-10-04 17:16:21 -07001417
1418 ktcomplete(f, skb);
1419
1420 /*
1421 * Note here that we do not perform an aoedev_put, as we are
1422 * leaving this reference for the ktio to release.
1423 */
1424 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426
1427void
1428aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
1429{
David S. Millere9bb8fb02008-09-21 22:36:49 -07001430 struct sk_buff_head queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431
David S. Millere9bb8fb02008-09-21 22:36:49 -07001432 __skb_queue_head_init(&queue);
1433 aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
1434 aoenet_xmit(&queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435}
Ed Cashina04b41c2012-12-17 16:03:39 -08001436
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001437struct sk_buff *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438aoecmd_ata_id(struct aoedev *d)
1439{
1440 struct aoe_hdr *h;
1441 struct aoe_atahdr *ah;
1442 struct frame *f;
1443 struct sk_buff *skb;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001444 struct aoetgt *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
Ed Cashin896831f2012-10-04 17:16:21 -07001446 f = newframe(d);
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001447 if (f == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 return NULL;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001449
1450 t = *d->tgt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
1452 /* initialize the headers & frame */
Ed L. Cashine407a7f2006-09-20 14:36:49 -04001453 skb = f->skb;
Ed L. Cashinabdbf942007-10-16 23:27:03 -07001454 h = (struct aoe_hdr *) skb_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 ah = (struct aoe_atahdr *) (h+1);
Ed L. Cashin19900cd2006-12-22 01:09:21 -08001456 skb_put(skb, sizeof *h + sizeof *ah);
1457 memset(h, 0, skb->len);
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001458 f->tag = aoehdr_atainit(d, t, h);
Ed Cashin896831f2012-10-04 17:16:21 -07001459 fhash(f);
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001460 t->nout++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 f->waited = 0;
Ed Cashin3fc9b032012-12-17 16:03:51 -08001462 f->waited_total = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 /* set up ata header */
1465 ah->scnt = 1;
Bartlomiej Zolnierkiewicz04b3ab52009-04-01 21:42:24 +02001466 ah->cmdstat = ATA_CMD_ID_ATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 ah->lba3 = 0xa0;
1468
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001469 skb->dev = t->ifp->nd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001471 d->rttavg = RTTAVG_INIT;
1472 d->rttdev = RTTDEV_INIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 d->timer.function = rexmit_timer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474
Ed Cashin5f0c9c42012-12-17 16:03:49 -08001475 skb = skb_clone(skb, GFP_ATOMIC);
1476 if (skb) {
1477 do_gettimeofday(&f->sent);
1478 f->sent_jiffs = (u32) jiffies;
1479 }
1480
1481 return skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482}
Ed Cashina04b41c2012-12-17 16:03:39 -08001483
Ed Cashin71114ec2012-12-17 16:04:11 -08001484static struct aoetgt **
1485grow_targets(struct aoedev *d)
1486{
1487 ulong oldn, newn;
1488 struct aoetgt **tt;
1489
1490 oldn = d->ntargets;
1491 newn = oldn * 2;
1492 tt = kcalloc(newn, sizeof(*d->targets), GFP_ATOMIC);
1493 if (!tt)
1494 return NULL;
1495 memmove(tt, d->targets, sizeof(*d->targets) * oldn);
1496 d->tgt = tt + (d->tgt - d->targets);
1497 kfree(d->targets);
1498 d->targets = tt;
1499 d->ntargets = newn;
1500
1501 return &d->targets[oldn];
1502}
1503
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001504static struct aoetgt *
1505addtgt(struct aoedev *d, char *addr, ulong nframes)
1506{
1507 struct aoetgt *t, **tt, **te;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001508
1509 tt = d->targets;
Ed Cashin71114ec2012-12-17 16:04:11 -08001510 te = tt + d->ntargets;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001511 for (; tt < te && *tt; tt++)
1512 ;
1513
Ed L. Cashin578c4aa2008-02-08 04:20:09 -08001514 if (tt == te) {
Ed Cashin71114ec2012-12-17 16:04:11 -08001515 tt = grow_targets(d);
1516 if (!tt)
1517 goto nomem;
Ed L. Cashin578c4aa2008-02-08 04:20:09 -08001518 }
Ed Cashin896831f2012-10-04 17:16:21 -07001519 t = kzalloc(sizeof(*t), GFP_ATOMIC);
Ed Cashin71114ec2012-12-17 16:04:11 -08001520 if (!t)
1521 goto nomem;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001522 t->nframes = nframes;
Ed Cashin896831f2012-10-04 17:16:21 -07001523 t->d = d;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001524 memcpy(t->addr, addr, sizeof t->addr);
1525 t->ifp = t->ifs;
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001526 aoecmd_wreset(t);
Ed Cashinbbb44e32012-12-17 16:04:08 -08001527 t->maxout = t->nframes / 2;
Ed Cashin896831f2012-10-04 17:16:21 -07001528 INIT_LIST_HEAD(&t->ffree);
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001529 return *tt = t;
Ed Cashin71114ec2012-12-17 16:04:11 -08001530
1531 nomem:
1532 pr_info("aoe: cannot allocate memory to add target\n");
1533 return NULL;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001534}
1535
Ed Cashin3f0f0132012-10-04 17:16:27 -07001536static void
1537setdbcnt(struct aoedev *d)
1538{
1539 struct aoetgt **t, **e;
1540 int bcnt = 0;
1541
1542 t = d->targets;
Ed Cashin71114ec2012-12-17 16:04:11 -08001543 e = t + d->ntargets;
Ed Cashin3f0f0132012-10-04 17:16:27 -07001544 for (; t < e && *t; t++)
1545 if (bcnt == 0 || bcnt > (*t)->minbcnt)
1546 bcnt = (*t)->minbcnt;
1547 if (bcnt != d->maxbcnt) {
1548 d->maxbcnt = bcnt;
1549 pr_info("aoe: e%ld.%d: setting %d byte data frames\n",
1550 d->aoemajor, d->aoeminor, bcnt);
1551 }
1552}
1553
1554static void
1555setifbcnt(struct aoetgt *t, struct net_device *nd, int bcnt)
1556{
1557 struct aoedev *d;
1558 struct aoeif *p, *e;
1559 int minbcnt;
1560
1561 d = t->d;
1562 minbcnt = bcnt;
1563 p = t->ifs;
1564 e = p + NAOEIFS;
1565 for (; p < e; p++) {
1566 if (p->nd == NULL)
1567 break; /* end of the valid interfaces */
1568 if (p->nd == nd) {
1569 p->bcnt = bcnt; /* we're updating */
1570 nd = NULL;
1571 } else if (minbcnt > p->bcnt)
1572 minbcnt = p->bcnt; /* find the min interface */
1573 }
1574 if (nd) {
1575 if (p == e) {
1576 pr_err("aoe: device setifbcnt failure; too many interfaces.\n");
1577 return;
1578 }
Ed Cashin1b86fda2012-10-04 17:16:34 -07001579 dev_hold(nd);
Ed Cashin3f0f0132012-10-04 17:16:27 -07001580 p->nd = nd;
1581 p->bcnt = bcnt;
1582 }
1583 t->minbcnt = minbcnt;
1584 setdbcnt(d);
1585}
1586
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587void
1588aoecmd_cfg_rsp(struct sk_buff *skb)
1589{
1590 struct aoedev *d;
1591 struct aoe_hdr *h;
1592 struct aoe_cfghdr *ch;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001593 struct aoetgt *t;
Ed Cashin0c966212012-10-04 17:16:40 -07001594 ulong flags, aoemajor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 struct sk_buff *sl;
Ed Cashin69cf2d852012-10-04 17:16:23 -07001596 struct sk_buff_head queue;
Ed L. Cashin19bf2632006-09-20 14:36:49 -04001597 u16 n;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
Ed Cashin69cf2d852012-10-04 17:16:23 -07001599 sl = NULL;
Ed L. Cashinabdbf942007-10-16 23:27:03 -07001600 h = (struct aoe_hdr *) skb_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 ch = (struct aoe_cfghdr *) (h+1);
1602
1603 /*
1604 * Enough people have their dip switches set backwards to
1605 * warrant a loud message for this special case.
1606 */
Harvey Harrison823ed722008-07-04 09:28:32 +02001607 aoemajor = get_unaligned_be16(&h->major);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 if (aoemajor == 0xfff) {
Ed L. Cashina12c93f2006-09-20 14:36:51 -04001609 printk(KERN_ERR "aoe: Warning: shelf address is all ones. "
Ed L. Cashin6bb6285f2006-09-20 14:36:49 -04001610 "Check shelf dip switches.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 return;
1612 }
Ed Cashin7159e962012-10-04 17:16:44 -07001613 if (aoemajor == 0xffff) {
1614 pr_info("aoe: e%ld.%d: broadcast shelf number invalid\n",
Ed Cashin0c966212012-10-04 17:16:40 -07001615 aoemajor, (int) h->minor);
Ed Cashin65833032012-10-04 17:16:32 -07001616 return;
1617 }
Ed Cashin7159e962012-10-04 17:16:44 -07001618 if (h->minor == 0xff) {
1619 pr_info("aoe: e%ld.%d: broadcast slot number invalid\n",
1620 aoemajor, (int) h->minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001621 return;
1622 }
1623
Ed L. Cashin19bf2632006-09-20 14:36:49 -04001624 n = be16_to_cpu(ch->bufcnt);
Ed L. Cashin7df620d2008-02-08 04:20:07 -08001625 if (n > aoe_maxout) /* keep it reasonable */
1626 n = aoe_maxout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627
Ed Cashin7159e962012-10-04 17:16:44 -07001628 d = aoedev_by_aoeaddr(aoemajor, h->minor, 1);
1629 if (d == NULL) {
1630 pr_info("aoe: device allocation failure\n");
1631 return;
1632 }
1633
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 spin_lock_irqsave(&d->lock, flags);
1635
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001636 t = gettgt(d, h->src);
Ed Cashin1b8a1632012-12-17 16:03:29 -08001637 if (t) {
1638 t->nframes = n;
1639 if (n < t->maxout)
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001640 aoecmd_wreset(t);
Ed Cashin1b8a1632012-12-17 16:03:29 -08001641 } else {
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001642 t = addtgt(d, h->src, n);
Ed Cashin69cf2d852012-10-04 17:16:23 -07001643 if (!t)
1644 goto bail;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001645 }
Ed Cashin3f0f0132012-10-04 17:16:27 -07001646 n = skb->dev->mtu;
1647 n -= sizeof(struct aoe_hdr) + sizeof(struct aoe_atahdr);
1648 n /= 512;
1649 if (n > ch->scnt)
1650 n = ch->scnt;
1651 n = n ? n * 512 : DEFAULTBCNT;
1652 setifbcnt(t, skb->dev, n);
Ed L. Cashin3ae1c242006-01-19 13:46:19 -05001653
1654 /* don't change users' perspective */
Ed Cashin69cf2d852012-10-04 17:16:23 -07001655 if (d->nopen == 0) {
1656 d->fw_ver = be16_to_cpu(ch->fwver);
1657 sl = aoecmd_ata_id(d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 }
Ed Cashin69cf2d852012-10-04 17:16:23 -07001659bail:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 spin_unlock_irqrestore(&d->lock, flags);
Ed Cashin69cf2d852012-10-04 17:16:23 -07001661 aoedev_put(d);
David S. Millere9bb8fb02008-09-21 22:36:49 -07001662 if (sl) {
David S. Millere9bb8fb02008-09-21 22:36:49 -07001663 __skb_queue_head_init(&queue);
1664 __skb_queue_tail(&queue, sl);
1665 aoenet_xmit(&queue);
1666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667}
1668
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001669void
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001670aoecmd_wreset(struct aoetgt *t)
1671{
1672 t->maxout = 1;
1673 t->ssthresh = t->nframes / 2;
1674 t->next_cwnd = t->nframes;
1675}
1676
1677void
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001678aoecmd_cleanslate(struct aoedev *d)
1679{
1680 struct aoetgt **t, **te;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001681
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001682 d->rttavg = RTTAVG_INIT;
1683 d->rttdev = RTTDEV_INIT;
Ed Cashin3f0f0132012-10-04 17:16:27 -07001684 d->maxbcnt = 0;
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001685
1686 t = d->targets;
Ed Cashin71114ec2012-12-17 16:04:11 -08001687 te = t + d->ntargets;
Ed Cashin3f0f0132012-10-04 17:16:27 -07001688 for (; t < te && *t; t++)
Ed Cashin3a0c40d2012-12-17 16:03:43 -08001689 aoecmd_wreset(*t);
Ed L. Cashin68e0d422008-02-08 04:20:00 -08001690}
Ed Cashin896831f2012-10-04 17:16:21 -07001691
Ed Cashin69cf2d852012-10-04 17:16:23 -07001692void
1693aoe_failbuf(struct aoedev *d, struct buf *buf)
1694{
1695 if (buf == NULL)
1696 return;
Kent Overstreetfeb261e2013-08-13 11:41:43 -07001697 buf->iter.bi_size = 0;
Ed Cashin69cf2d852012-10-04 17:16:23 -07001698 clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
1699 if (buf->nframesout == 0)
1700 aoe_end_buf(d, buf);
1701}
1702
1703void
1704aoe_flush_iocq(void)
Ed Cashin896831f2012-10-04 17:16:21 -07001705{
Ed Cashin8030d342013-07-03 15:09:05 -07001706 int i;
1707
1708 for (i = 0; i < ncpus; i++) {
1709 if (kts[i].active)
1710 aoe_flush_iocq_by_index(i);
1711 }
1712}
1713
1714void
1715aoe_flush_iocq_by_index(int id)
1716{
Ed Cashin896831f2012-10-04 17:16:21 -07001717 struct frame *f;
1718 struct aoedev *d;
1719 LIST_HEAD(flist);
1720 struct list_head *pos;
1721 struct sk_buff *skb;
1722 ulong flags;
1723
Ed Cashin8030d342013-07-03 15:09:05 -07001724 spin_lock_irqsave(&iocq[id].lock, flags);
1725 list_splice_init(&iocq[id].head, &flist);
1726 spin_unlock_irqrestore(&iocq[id].lock, flags);
Ed Cashin896831f2012-10-04 17:16:21 -07001727 while (!list_empty(&flist)) {
1728 pos = flist.next;
1729 list_del(pos);
1730 f = list_entry(pos, struct frame, head);
1731 d = f->t->d;
1732 skb = f->r_skb;
1733 spin_lock_irqsave(&d->lock, flags);
1734 if (f->buf) {
1735 f->buf->nframesout--;
1736 aoe_failbuf(d, f->buf);
1737 }
1738 aoe_freetframe(f);
1739 spin_unlock_irqrestore(&d->lock, flags);
1740 dev_kfree_skb(skb);
Ed Cashin69cf2d852012-10-04 17:16:23 -07001741 aoedev_put(d);
Ed Cashin896831f2012-10-04 17:16:21 -07001742 }
1743}
1744
1745int __init
1746aoecmd_init(void)
1747{
Ed Cashinbbb44e32012-12-17 16:04:08 -08001748 void *p;
Ed Cashin8030d342013-07-03 15:09:05 -07001749 int i;
1750 int ret;
Ed Cashinbbb44e32012-12-17 16:04:08 -08001751
1752 /* get_zeroed_page returns page with ref count 1 */
1753 p = (void *) get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
1754 if (!p)
1755 return -ENOMEM;
1756 empty_page = virt_to_page(p);
1757
Ed Cashin8030d342013-07-03 15:09:05 -07001758 ncpus = num_online_cpus();
1759
1760 iocq = kcalloc(ncpus, sizeof(struct iocq_ktio), GFP_KERNEL);
1761 if (!iocq)
1762 return -ENOMEM;
1763
1764 kts = kcalloc(ncpus, sizeof(struct ktstate), GFP_KERNEL);
1765 if (!kts) {
1766 ret = -ENOMEM;
1767 goto kts_fail;
1768 }
1769
1770 ktiowq = kcalloc(ncpus, sizeof(wait_queue_head_t), GFP_KERNEL);
1771 if (!ktiowq) {
1772 ret = -ENOMEM;
1773 goto ktiowq_fail;
1774 }
1775
1776 mutex_init(&ktio_spawn_lock);
1777
1778 for (i = 0; i < ncpus; i++) {
1779 INIT_LIST_HEAD(&iocq[i].head);
1780 spin_lock_init(&iocq[i].lock);
1781 init_waitqueue_head(&ktiowq[i]);
1782 snprintf(kts[i].name, sizeof(kts[i].name), "aoe_ktio%d", i);
1783 kts[i].fn = ktio;
1784 kts[i].waitq = &ktiowq[i];
1785 kts[i].lock = &iocq[i].lock;
1786 kts[i].id = i;
1787 kts[i].active = 0;
1788 }
1789 kts[0].active = 1;
1790 if (aoe_ktstart(&kts[0])) {
1791 ret = -ENOMEM;
1792 goto ktstart_fail;
1793 }
1794 return 0;
1795
1796ktstart_fail:
1797 kfree(ktiowq);
1798ktiowq_fail:
1799 kfree(kts);
1800kts_fail:
1801 kfree(iocq);
1802
1803 return ret;
Ed Cashin896831f2012-10-04 17:16:21 -07001804}
1805
1806void
1807aoecmd_exit(void)
1808{
Ed Cashin8030d342013-07-03 15:09:05 -07001809 int i;
1810
1811 for (i = 0; i < ncpus; i++)
1812 if (kts[i].active)
1813 aoe_ktstop(&kts[i]);
1814
Ed Cashin69cf2d852012-10-04 17:16:23 -07001815 aoe_flush_iocq();
Ed Cashinbbb44e32012-12-17 16:04:08 -08001816
Ed Cashin8030d342013-07-03 15:09:05 -07001817 /* Free up the iocq and thread speicific configuration
1818 * allocated during startup.
1819 */
1820 kfree(iocq);
1821 kfree(kts);
1822 kfree(ktiowq);
1823
Ed Cashinbbb44e32012-12-17 16:04:08 -08001824 free_page((unsigned long) page_address(empty_page));
1825 empty_page = NULL;
Ed Cashin896831f2012-10-04 17:16:21 -07001826}