#include <linux/netdevice.h>
#include <linux/genhd.h>
#include <linux/moduleparam.h>
+#include <linux/workqueue.h>
+#include <linux/kthread.h>
#include <net/net_namespace.h>
#include <asm/unaligned.h>
+#include <linux/uio.h>
#include "aoe.h"
+#define MAXIOC (8192) /* default meant to avoid most soft lockups */
+
+static void ktcomplete(struct frame *, struct sk_buff *);
+
static int aoe_deadsecs = 60 * 3;
module_param(aoe_deadsecs, int, 0644);
MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
MODULE_PARM_DESC(aoe_maxout,
"Only aoe_maxout outstanding packets for every MAC on eX.Y.");
+static wait_queue_head_t ktiowq;
+static struct ktstate kts;
+
+/* io completion queue */
+static struct {
+ struct list_head head;
+ spinlock_t lock;
+} iocq;
+
static struct sk_buff *
new_skb(ulong len)
{
}
static struct frame *
-getframe(struct aoetgt *t, int tag)
+getframe(struct aoetgt *t, u32 tag)
{
- struct frame *f, *e;
+ struct frame *f;
+ struct list_head *head, *pos, *nx;
+ u32 n;
- f = t->frames;
- e = f + t->nframes;
- for (; f<e; f++)
- if (f->tag == tag)
+ n = tag % NFACTIVE;
+ head = &t->factive[n];
+ list_for_each_safe(pos, nx, head) {
+ f = list_entry(pos, struct frame, head);
+ if (f->tag == tag) {
+ list_del(pos);
return f;
+ }
+ }
return NULL;
}
return n |= (++t->lasttag & 0x7fff) << 16;
}
-static int
+static u32
aoehdr_atainit(struct aoedev *d, struct aoetgt *t, struct aoe_hdr *h)
{
u32 host_tag = newtag(t);
return NULL;
}
-/* freeframe is where we do our load balancing so it's a little hairy. */
+void
+aoe_freetframe(struct frame *f)
+{
+ struct aoetgt *t;
+
+ t = f->t;
+ f->buf = NULL;
+ f->bv = NULL;
+ f->r_skb = NULL;
+ list_add(&f->head, &t->ffree);
+}
+
static struct frame *
-freeframe(struct aoedev *d)
+newtframe(struct aoedev *d, struct aoetgt *t)
{
- struct frame *f, *e, *rf;
- struct aoetgt **t;
+ struct frame *f;
struct sk_buff *skb;
+ struct list_head *pos;
+
+ if (list_empty(&t->ffree)) {
+ if (t->falloc >= NSKBPOOLMAX*2)
+ return NULL;
+ f = kcalloc(1, sizeof(*f), GFP_ATOMIC);
+ if (f == NULL)
+ return NULL;
+ t->falloc++;
+ f->t = t;
+ } else {
+ pos = t->ffree.next;
+ list_del(pos);
+ f = list_entry(pos, struct frame, head);
+ }
+
+ skb = f->skb;
+ if (skb == NULL) {
+ f->skb = skb = new_skb(ETH_ZLEN);
+ if (!skb) {
+bail: aoe_freetframe(f);
+ return NULL;
+ }
+ }
+
+ if (atomic_read(&skb_shinfo(skb)->dataref) != 1) {
+ skb = skb_pool_get(d);
+ if (skb == NULL)
+ goto bail;
+ skb_pool_put(d, f->skb);
+ f->skb = skb;
+ }
+
+ skb->truesize -= skb->data_len;
+ skb_shinfo(skb)->nr_frags = skb->data_len = 0;
+ skb_trim(skb, 0);
+ return f;
+}
+
+static struct frame *
+newframe(struct aoedev *d)
+{
+ struct frame *f;
+ struct aoetgt *t, **tt;
+ int totout = 0;
if (d->targets[0] == NULL) { /* shouldn't happen, but I'm paranoid */
printk(KERN_ERR "aoe: NULL TARGETS!\n");
return NULL;
}
- t = d->tgt;
- t++;
- if (t >= &d->targets[NTARGETS] || !*t)
- t = d->targets;
+ tt = d->tgt; /* last used target */
for (;;) {
- if ((*t)->nout < (*t)->maxout
+ tt++;
+ if (tt >= &d->targets[NTARGETS] || !*tt)
+ tt = d->targets;
+ t = *tt;
+ totout += t->nout;
+ if (t->nout < t->maxout
&& t != d->htgt
- && (*t)->ifp->nd) {
- rf = NULL;
- f = (*t)->frames;
- e = f + (*t)->nframes;
- for (; f < e; f++) {
- if (f->tag != FREETAG)
- continue;
- skb = f->skb;
- if (!skb
- && !(f->skb = skb = new_skb(ETH_ZLEN)))
- continue;
- if (atomic_read(&skb_shinfo(skb)->dataref)
- != 1) {
- if (!rf)
- rf = f;
- continue;
- }
-gotone: skb->truesize -= skb->data_len;
- skb_shinfo(skb)->nr_frags = skb->data_len = 0;
- skb_trim(skb, 0);
- d->tgt = t;
- ifrotate(*t);
+ && t->ifp->nd) {
+ f = newtframe(d, t);
+ if (f) {
+ d->tgt = tt;
+ ifrotate(t);
return f;
}
- /* Work can be done, but the network layer is
- holding our precious packets. Try to grab
- one from the pool. */
- f = rf;
- if (f == NULL) { /* more paranoia */
- printk(KERN_ERR
- "aoe: freeframe: %s.\n",
- "unexpected null rf");
- d->flags |= DEVFL_KICKME;
- return NULL;
- }
- skb = skb_pool_get(d);
- if (skb) {
- skb_pool_put(d, f->skb);
- f->skb = skb;
- goto gotone;
- }
- (*t)->dataref++;
- if ((*t)->nout == 0)
- d->flags |= DEVFL_KICKME;
}
- if (t == d->tgt) /* we've looped and found nada */
+ if (tt == d->tgt) /* we've looped and found nada */
break;
- t++;
- if (t >= &d->targets[NTARGETS] || !*t)
- t = d->targets;
+ }
+ if (totout == 0) {
+ d->kicked++;
+ d->flags |= DEVFL_KICKME;
}
return NULL;
}
goto loop;
}
+static void
+fhash(struct frame *f)
+{
+ struct aoetgt *t = f->t;
+ u32 n;
+
+ n = f->tag % NFACTIVE;
+ list_add_tail(&f->head, &t->factive[n]);
+}
+
static int
aoecmd_ata_rw(struct aoedev *d)
{
writebit = 0x10;
extbit = 0x4;
- f = freeframe(d);
+ f = newframe(d);
if (f == NULL)
return 0;
t = *d->tgt;
skb_put(skb, sizeof *h + sizeof *ah);
memset(h, 0, skb->len);
f->tag = aoehdr_atainit(d, t, h);
+ fhash(f);
t->nout++;
f->waited = 0;
f->buf = buf;
}
static void
-resend(struct aoedev *d, struct aoetgt *t, struct frame *f)
+resend(struct aoedev *d, struct frame *f)
{
struct sk_buff *skb;
struct aoe_hdr *h;
struct aoe_atahdr *ah;
+ struct aoetgt *t;
char buf[128];
u32 n;
+ t = f->t;
ifrotate(t);
n = newtag(t);
skb = f->skb;
aoechr_error(buf);
f->tag = n;
+ fhash(f);
h->tag = cpu_to_be32(n);
memcpy(h->dst, t->addr, sizeof h->dst);
memcpy(h->src, t->ifp->nd->dev_addr, sizeof h->src);
- switch (ah->cmdstat) {
- default:
- break;
- case ATA_CMD_PIO_READ:
- case ATA_CMD_PIO_READ_EXT:
- case ATA_CMD_PIO_WRITE:
- case ATA_CMD_PIO_WRITE_EXT:
- put_lba(ah, f->lba);
-
- n = f->bcnt;
- ah->scnt = n >> 9;
- if (ah->aflags & AOEAFL_WRITE) {
- skb_fillup(skb, f->bv, f->bv_off, n);
- skb->len = sizeof *h + sizeof *ah + n;
- skb->data_len = n;
- skb->truesize += n;
- }
- }
skb->dev = t->ifp->nd;
skb = skb_clone(skb, GFP_ATOMIC);
if (skb == NULL)
}
static int
-tsince(int tag)
+tsince(u32 tag)
{
int n;
static int
sthtith(struct aoedev *d)
{
- struct frame *f, *e, *nf;
+ struct frame *f, *nf;
+ struct list_head *nx, *pos, *head;
struct sk_buff *skb;
- struct aoetgt *ht = *d->htgt;
-
- f = ht->frames;
- e = f + ht->nframes;
- for (; f < e; f++) {
- if (f->tag == FREETAG)
- continue;
- nf = freeframe(d);
- if (!nf)
- return 0;
- skb = nf->skb;
- *nf = *f;
- f->skb = skb;
- f->tag = FREETAG;
- nf->waited = 0;
- ht->nout--;
- (*d->tgt)->nout++;
- resend(d, *d->tgt, nf);
+ struct aoetgt *ht = d->htgt;
+ int i;
+
+ for (i = 0; i < NFACTIVE; i++) {
+ head = &ht->factive[i];
+ list_for_each_safe(pos, nx, head) {
+ f = list_entry(pos, struct frame, head);
+ nf = newframe(d);
+ if (!nf)
+ return 0;
+
+ /* remove frame from active list */
+ list_del(pos);
+
+ /* reassign all pertinent bits to new outbound frame */
+ skb = nf->skb;
+ nf->skb = f->skb;
+ nf->buf = f->buf;
+ nf->bcnt = f->bcnt;
+ nf->lba = f->lba;
+ nf->bv = f->bv;
+ nf->bv_off = f->bv_off;
+ nf->waited = 0;
+ f->skb = skb;
+ aoe_freetframe(f);
+ ht->nout--;
+ nf->t->nout++;
+ resend(d, nf);
+ }
}
/* he's clean, he's useless. take away his interfaces */
memset(ht->ifs, 0, sizeof ht->ifs);
struct aoedev *d;
struct aoetgt *t, **tt, **te;
struct aoeif *ifp;
- struct frame *f, *e;
+ struct frame *f;
+ struct list_head *head, *pos, *nx;
+ LIST_HEAD(flist);
register long timeout;
ulong flags, n;
+ int i;
d = (struct aoedev *) vp;
spin_unlock_irqrestore(&d->lock, flags);
return;
}
+
+ /* collect all frames to rexmit into flist */
tt = d->targets;
te = tt + NTARGETS;
for (; tt < te && *tt; tt++) {
t = *tt;
- f = t->frames;
- e = f + t->nframes;
- for (; f < e; f++) {
- if (f->tag == FREETAG
- || tsince(f->tag) < timeout)
- continue;
- n = f->waited += timeout;
- n /= HZ;
- if (n > aoe_deadsecs) {
- /* waited too long. device failure. */
- aoedev_downdev(d);
- break;
- }
-
- if (n > HELPWAIT /* see if another target can help */
- && (tt != d->targets || d->targets[1]))
- d->htgt = tt;
-
- if (t->nout == t->maxout) {
- if (t->maxout > 1)
- t->maxout--;
- t->lastwadj = jiffies;
- }
-
- ifp = getif(t, f->skb->dev);
- if (ifp && ++ifp->lost > (t->nframes << 1)
- && (ifp != t->ifs || t->ifs[1].nd)) {
- ejectif(t, ifp);
- ifp = NULL;
+ for (i = 0; i < NFACTIVE; i++) {
+ head = &t->factive[i];
+ list_for_each_safe(pos, nx, head) {
+ f = list_entry(pos, struct frame, head);
+ if (tsince(f->tag) < timeout)
+ continue;
+ /* move to flist for later processing */
+ list_move_tail(pos, &flist);
}
- resend(d, t, f);
}
/* window check */
}
}
+ /* process expired frames */
+ while (!list_empty(&flist)) {
+ pos = flist.next;
+ f = list_entry(pos, struct frame, head);
+ n = f->waited += timeout;
+ n /= HZ;
+ if (n > aoe_deadsecs) {
+ /* Waited too long. Device failure.
+ * Hang all frames on first hash bucket for downdev
+ * to clean up.
+ */
+ list_splice(&flist, &f->t->factive[0]);
+ aoedev_downdev(d);
+ break;
+ }
+ list_del(pos);
+
+ t = f->t;
+ if (n > HELPWAIT) {
+ /* see if another target can help */
+ if (d->ntargets > 1)
+ d->htgt = t;
+ }
+ if (t->nout == t->maxout) {
+ if (t->maxout > 1)
+ t->maxout--;
+ t->lastwadj = jiffies;
+ }
+
+ ifp = getif(t, f->skb->dev);
+ if (ifp && ++ifp->lost > (t->nframes << 1)
+ && (ifp != t->ifs || t->ifs[1].nd)) {
+ ejectif(t, ifp);
+ ifp = NULL;
+ }
+ resend(d, f);
+ }
+
if (!skb_queue_empty(&d->sendq)) {
n = d->rttavg <<= 1;
if (n > MAXTIMER)
}
static void
-bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, ulong cnt)
+bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, long cnt)
{
ulong fcnt;
char *p;
}
static void
-fadvance(struct frame *f, ulong cnt)
+ktiocomplete(struct frame *f)
{
- ulong fcnt;
+ struct aoe_hdr *hin, *hout;
+ struct aoe_atahdr *ahin, *ahout;
+ struct buf *buf;
+ struct sk_buff *skb;
+ struct aoetgt *t;
+ struct aoeif *ifp;
+ struct aoedev *d;
+ long n;
- f->lba += cnt >> 9;
-loop:
- fcnt = f->bv->bv_len - (f->bv_off - f->bv->bv_offset);
- if (fcnt > cnt) {
- f->bv_off += cnt;
+ if (f == NULL)
return;
+
+ t = f->t;
+ d = t->d;
+
+ hout = (struct aoe_hdr *) skb_mac_header(f->skb);
+ ahout = (struct aoe_atahdr *) (hout+1);
+ buf = f->buf;
+ skb = f->r_skb;
+ if (skb == NULL)
+ goto noskb; /* just fail the buf. */
+
+ hin = (struct aoe_hdr *) skb->data;
+ skb_pull(skb, sizeof(*hin));
+ ahin = (struct aoe_atahdr *) skb->data;
+ skb_pull(skb, sizeof(*ahin));
+ if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
+ pr_err("aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
+ ahout->cmdstat, ahin->cmdstat,
+ d->aoemajor, d->aoeminor);
+noskb: if (buf)
+ buf->flags |= BUFFL_FAIL;
+ goto badrsp;
}
- cnt -= fcnt;
- f->bv++;
- f->bv_off = f->bv->bv_offset;
- goto loop;
+
+ n = ahout->scnt << 9;
+ switch (ahout->cmdstat) {
+ case ATA_CMD_PIO_READ:
+ case ATA_CMD_PIO_READ_EXT:
+ if (skb->len < n) {
+ pr_err("aoe: runt data size in read. skb->len=%d need=%ld\n",
+ skb->len, n);
+ buf->flags |= BUFFL_FAIL;
+ break;
+ }
+ bvcpy(f->bv, f->bv_off, skb, n);
+ case ATA_CMD_PIO_WRITE:
+ case ATA_CMD_PIO_WRITE_EXT:
+ spin_lock_irq(&d->lock);
+ ifp = getif(t, skb->dev);
+ if (ifp) {
+ ifp->lost = 0;
+ if (n > DEFAULTBCNT)
+ ifp->lostjumbo = 0;
+ }
+ if (d->htgt == t) /* I'll help myself, thank you. */
+ d->htgt = NULL;
+ spin_unlock_irq(&d->lock);
+ break;
+ case ATA_CMD_ID_ATA:
+ if (skb->len < 512) {
+ pr_info("aoe: runt data size in ataid. skb->len=%d\n",
+ skb->len);
+ break;
+ }
+ if (skb_linearize(skb))
+ break;
+ spin_lock_irq(&d->lock);
+ ataid_complete(d, t, skb->data);
+ spin_unlock_irq(&d->lock);
+ break;
+ default:
+ pr_info("aoe: unrecognized ata command %2.2Xh for %d.%d\n",
+ ahout->cmdstat,
+ be16_to_cpu(get_unaligned(&hin->major)),
+ hin->minor);
+ }
+badrsp:
+ spin_lock_irq(&d->lock);
+
+ aoe_freetframe(f);
+
+ if (buf && --buf->nframesout == 0 && buf->resid == 0) {
+ struct bio *bio = buf->bio;
+
+ diskstats(d->gd, bio, jiffies - buf->stime, buf->sector);
+ n = (buf->flags & BUFFL_FAIL) ? -EIO : 0;
+ mempool_free(buf, d->bufpool);
+ spin_unlock_irq(&d->lock);
+ if (n != -EIO)
+ bio_flush_dcache_pages(buf->bio);
+ bio_endio(bio, n);
+ } else
+ spin_unlock_irq(&d->lock);
+ dev_kfree_skb(skb);
}
-void
+/* Enters with iocq.lock held.
+ * Returns true iff responses needing processing remain.
+ */
+static int
+ktio(void)
+{
+ struct frame *f;
+ struct list_head *pos;
+ int i;
+
+ for (i = 0; ; ++i) {
+ if (i == MAXIOC)
+ return 1;
+ if (list_empty(&iocq.head))
+ return 0;
+ pos = iocq.head.next;
+ list_del(pos);
+ spin_unlock_irq(&iocq.lock);
+ f = list_entry(pos, struct frame, head);
+ ktiocomplete(f);
+ spin_lock_irq(&iocq.lock);
+ }
+}
+
+static int
+kthread(void *vp)
+{
+ struct ktstate *k;
+ DECLARE_WAITQUEUE(wait, current);
+ int more;
+
+ k = vp;
+ current->flags |= PF_NOFREEZE;
+ set_user_nice(current, -10);
+ complete(&k->rendez); /* tell spawner we're running */
+ do {
+ spin_lock_irq(k->lock);
+ more = k->fn();
+ if (!more) {
+ add_wait_queue(k->waitq, &wait);
+ __set_current_state(TASK_INTERRUPTIBLE);
+ }
+ spin_unlock_irq(k->lock);
+ if (!more) {
+ schedule();
+ remove_wait_queue(k->waitq, &wait);
+ } else
+ cond_resched();
+ } while (!kthread_should_stop());
+ complete(&k->rendez); /* tell spawner we're stopping */
+ return 0;
+}
+
+static void
+aoe_ktstop(struct ktstate *k)
+{
+ kthread_stop(k->task);
+ wait_for_completion(&k->rendez);
+}
+
+static int
+aoe_ktstart(struct ktstate *k)
+{
+ struct task_struct *task;
+
+ init_completion(&k->rendez);
+ task = kthread_run(kthread, k, k->name);
+ if (task == NULL || IS_ERR(task))
+ return -ENOMEM;
+ k->task = task;
+ wait_for_completion(&k->rendez); /* allow kthread to start */
+ init_completion(&k->rendez); /* for waiting for exit later */
+ return 0;
+}
+
+/* pass it off to kthreads for processing */
+static void
+ktcomplete(struct frame *f, struct sk_buff *skb)
+{
+ ulong flags;
+
+ f->r_skb = skb;
+ spin_lock_irqsave(&iocq.lock, flags);
+ list_add_tail(&f->head, &iocq.head);
+ spin_unlock_irqrestore(&iocq.lock, flags);
+ wake_up(&ktiowq);
+}
+
+struct sk_buff *
aoecmd_ata_rsp(struct sk_buff *skb)
{
- struct sk_buff_head queue;
struct aoedev *d;
- struct aoe_hdr *hin, *hout;
- struct aoe_atahdr *ahin, *ahout;
+ struct aoe_hdr *h;
struct frame *f;
- struct buf *buf;
struct aoetgt *t;
- struct aoeif *ifp;
- register long n;
+ u32 n;
ulong flags;
char ebuf[128];
u16 aoemajor;
- hin = (struct aoe_hdr *) skb_mac_header(skb);
- skb_pull(skb, sizeof(*hin));
- aoemajor = get_unaligned_be16(&hin->major);
- d = aoedev_by_aoeaddr(aoemajor, hin->minor);
+ h = (struct aoe_hdr *) skb->data;
+ aoemajor = be16_to_cpu(get_unaligned(&h->major));
+ d = aoedev_by_aoeaddr(aoemajor, h->minor);
if (d == NULL) {
snprintf(ebuf, sizeof ebuf, "aoecmd_ata_rsp: ata response "
"for unknown device %d.%d\n",
- aoemajor, hin->minor);
+ aoemajor, h->minor);
aoechr_error(ebuf);
- return;
+ return skb;
}
spin_lock_irqsave(&d->lock, flags);
- n = get_unaligned_be32(&hin->tag);
- t = gettgt(d, hin->src);
+ n = be32_to_cpu(get_unaligned(&h->tag));
+ t = gettgt(d, h->src);
if (t == NULL) {
printk(KERN_INFO "aoe: can't find target e%ld.%d:%pm\n",
- d->aoemajor, d->aoeminor, hin->src);
+ d->aoemajor, d->aoeminor, h->src);
spin_unlock_irqrestore(&d->lock, flags);
- return;
+ return skb;
}
f = getframe(t, n);
if (f == NULL) {
snprintf(ebuf, sizeof ebuf,
"%15s e%d.%d tag=%08x@%08lx\n",
"unexpected rsp",
- get_unaligned_be16(&hin->major),
- hin->minor,
- get_unaligned_be32(&hin->tag),
+ get_unaligned_be16(&h->major),
+ h->minor,
+ get_unaligned_be32(&h->tag),
jiffies);
aoechr_error(ebuf);
- return;
+ return skb;
}
-
calc_rttavg(d, tsince(f->tag));
-
- ahin = (struct aoe_atahdr *) skb->data;
- skb_pull(skb, sizeof(*ahin));
- hout = (struct aoe_hdr *) skb_mac_header(f->skb);
- ahout = (struct aoe_atahdr *) (hout+1);
- buf = f->buf;
-
- if (ahin->cmdstat & 0xa9) { /* these bits cleared on success */
- printk(KERN_ERR
- "aoe: ata error cmd=%2.2Xh stat=%2.2Xh from e%ld.%d\n",
- ahout->cmdstat, ahin->cmdstat,
- d->aoemajor, d->aoeminor);
- if (buf)
- buf->flags |= BUFFL_FAIL;
- } else {
- if (d->htgt && t == *d->htgt) /* I'll help myself, thank you. */
- d->htgt = NULL;
- n = ahout->scnt << 9;
- switch (ahout->cmdstat) {
- case ATA_CMD_PIO_READ:
- case ATA_CMD_PIO_READ_EXT:
- if (skb->len < n) {
- printk(KERN_ERR
- "aoe: %s. skb->len=%d need=%ld\n",
- "runt data size in read", skb->len, n);
- /* fail frame f? just returning will rexmit. */
- spin_unlock_irqrestore(&d->lock, flags);
- return;
- }
- bvcpy(f->bv, f->bv_off, skb, n);
- case ATA_CMD_PIO_WRITE:
- case ATA_CMD_PIO_WRITE_EXT:
- ifp = getif(t, skb->dev);
- if (ifp) {
- ifp->lost = 0;
- if (n > DEFAULTBCNT)
- ifp->lostjumbo = 0;
- }
- if (f->bcnt -= n) {
- fadvance(f, n);
- resend(d, t, f);
- goto xmit;
- }
- break;
- case ATA_CMD_ID_ATA:
- if (skb->len < 512) {
- printk(KERN_INFO
- "aoe: runt data size in ataid. skb->len=%d\n",
- skb->len);
- spin_unlock_irqrestore(&d->lock, flags);
- return;
- }
- if (skb_linearize(skb))
- break;
- ataid_complete(d, t, skb->data);
- break;
- default:
- printk(KERN_INFO
- "aoe: unrecognized ata command %2.2Xh for %d.%d\n",
- ahout->cmdstat,
- get_unaligned_be16(&hin->major),
- hin->minor);
- }
- }
-
- if (buf && --buf->nframesout == 0 && buf->resid == 0) {
- diskstats(d->gd, buf->bio, jiffies - buf->stime, buf->sector);
- if (buf->flags & BUFFL_FAIL)
- bio_endio(buf->bio, -EIO);
- else {
- bio_flush_dcache_pages(buf->bio);
- bio_endio(buf->bio, 0);
- }
- mempool_free(buf, d->bufpool);
- }
-
- f->buf = NULL;
- f->tag = FREETAG;
t->nout--;
-
aoecmd_work(d);
-xmit:
- __skb_queue_head_init(&queue);
- skb_queue_splice_init(&d->sendq, &queue);
spin_unlock_irqrestore(&d->lock, flags);
- aoenet_xmit(&queue);
+
+ ktcomplete(f, skb);
+
+ /*
+ * Note here that we do not perform an aoedev_put, as we are
+ * leaving this reference for the ktio to release.
+ */
+ return NULL;
}
void
struct sk_buff *skb;
struct aoetgt *t;
- f = freeframe(d);
+ f = newframe(d);
if (f == NULL)
return NULL;
skb_put(skb, sizeof *h + sizeof *ah);
memset(h, 0, skb->len);
f->tag = aoehdr_atainit(d, t, h);
+ fhash(f);
t->nout++;
f->waited = 0;
addtgt(struct aoedev *d, char *addr, ulong nframes)
{
struct aoetgt *t, **tt, **te;
- struct frame *f, *e;
+ int i;
tt = d->targets;
te = tt + NTARGETS;
"aoe: device addtgt failure; too many targets\n");
return NULL;
}
- t = kcalloc(1, sizeof *t, GFP_ATOMIC);
- f = kcalloc(nframes, sizeof *f, GFP_ATOMIC);
- if (!t || !f) {
- kfree(f);
- kfree(t);
+ t = kzalloc(sizeof(*t), GFP_ATOMIC);
+ if (!t) {
printk(KERN_INFO "aoe: cannot allocate memory to add target\n");
return NULL;
}
+ d->ntargets++;
t->nframes = nframes;
- t->frames = f;
- e = f + nframes;
- for (; f < e; f++)
- f->tag = FREETAG;
+ t->d = d;
memcpy(t->addr, addr, sizeof t->addr);
t->ifp = t->ifs;
t->maxout = t->nframes;
+ INIT_LIST_HEAD(&t->ffree);
+ for (i = 0; i < NFACTIVE; ++i)
+ INIT_LIST_HEAD(&t->factive[i]);
return *tt = t;
}
}
}
}
+
+static void
+flush_iocq(void)
+{
+ struct frame *f;
+ struct aoedev *d;
+ LIST_HEAD(flist);
+ struct list_head *pos;
+ struct sk_buff *skb;
+ ulong flags;
+
+ spin_lock_irqsave(&iocq.lock, flags);
+ list_splice_init(&iocq.head, &flist);
+ spin_unlock_irqrestore(&iocq.lock, flags);
+ while (!list_empty(&flist)) {
+ pos = flist.next;
+ list_del(pos);
+ f = list_entry(pos, struct frame, head);
+ d = f->t->d;
+ skb = f->r_skb;
+ spin_lock_irqsave(&d->lock, flags);
+ if (f->buf) {
+ f->buf->nframesout--;
+ aoe_failbuf(d, f->buf);
+ }
+ aoe_freetframe(f);
+ spin_unlock_irqrestore(&d->lock, flags);
+ dev_kfree_skb(skb);
+ }
+}
+
+int __init
+aoecmd_init(void)
+{
+ INIT_LIST_HEAD(&iocq.head);
+ spin_lock_init(&iocq.lock);
+ init_waitqueue_head(&ktiowq);
+ kts.name = "aoe_ktio";
+ kts.fn = ktio;
+ kts.waitq = &ktiowq;
+ kts.lock = &iocq.lock;
+ return aoe_ktstart(&kts);
+}
+
+void
+aoecmd_exit(void)
+{
+ aoe_ktstop(&kts);
+ flush_iocq();
+}
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff