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linux-sg2042
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aoe: Use SKB interfaces for list management instead of home-grown stuff. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-09-21 22:36:49 -07:00
parent 67fed45930
commit e9bb8fb0b6
7 changed files with 56 additions and 76 deletions
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9
drivers/block/aoe/aoe.h
View File

@ -159,11 +159,8 @@ struct aoedev {
sector_t ssize;
struct timer_list timer;
spinlock_t lock;
struct sk_buff *sendq_hd; /* packets needing to be sent, list head */
struct sk_buff *sendq_tl;
struct sk_buff *skbpool_hd;
struct sk_buff *skbpool_tl;
int nskbpool;
struct sk_buff_head sendq;
struct sk_buff_head skbpool;
mempool_t *bufpool; /* for deadlock-free Buf allocation */
struct list_head bufq; /* queue of bios to work on */
struct buf *inprocess; /* the one we're currently working on */
@ -199,7 +196,7 @@ int aoedev_flush(const char __user *str, size_t size);
int aoenet_init(void);
void aoenet_exit(void);
void aoenet_xmit(struct sk_buff *);
void aoenet_xmit(struct sk_buff_head *);
int is_aoe_netif(struct net_device *ifp);
int set_aoe_iflist(const char __user *str, size_t size);

8
drivers/block/aoe/aoeblk.c
View File

@ -158,9 +158,9 @@ aoeblk_release(struct inode *inode, struct file *filp)
static int
aoeblk_make_request(struct request_queue *q, struct bio *bio)
{
struct sk_buff_head queue;
struct aoedev *d;
struct buf *buf;
struct sk_buff *sl;
ulong flags;
blk_queue_bounce(q, &bio);
@ -213,11 +213,11 @@ aoeblk_make_request(struct request_queue *q, struct bio *bio)
list_add_tail(&buf->bufs, &d->bufq);
aoecmd_work(d);
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
__skb_queue_head_init(&queue);
skb_queue_splice_init(&d->sendq, &queue);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
aoenet_xmit(&queue);
return 0;
}

8
drivers/block/aoe/aoechr.c
View File

@ -9,6 +9,7 @@
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/smp_lock.h>
#include <linux/skbuff.h>
#include "aoe.h"
enum {
@ -103,7 +104,12 @@ loop:
spin_lock_irqsave(&d->lock, flags);
goto loop;
}
aoenet_xmit(skb);
if (skb) {
struct sk_buff_head queue;
__skb_queue_head_init(&queue);
__skb_queue_tail(&queue, skb);
aoenet_xmit(&queue);
}
aoecmd_cfg(major, minor);
return 0;
}

85
drivers/block/aoe/aoecmd.c
View File

@ -114,29 +114,22 @@ ifrotate(struct aoetgt *t)
static void
skb_pool_put(struct aoedev *d, struct sk_buff *skb)
{
if (!d->skbpool_hd)
d->skbpool_hd = skb;
else
d->skbpool_tl->next = skb;
d->skbpool_tl = skb;
__skb_queue_tail(&d->skbpool, skb);
}
static struct sk_buff *
skb_pool_get(struct aoedev *d)
{
struct sk_buff *skb;
struct sk_buff *skb = skb_peek(&d->skbpool);
skb = d->skbpool_hd;
if (skb && atomic_read(&skb_shinfo(skb)->dataref) == 1) {
d->skbpool_hd = skb->next;
skb->next = NULL;
__skb_unlink(skb, &d->skbpool);
return skb;
}
if (d->nskbpool < NSKBPOOLMAX
&& (skb = new_skb(ETH_ZLEN))) {
d->nskbpool++;
if (skb_queue_len(&d->skbpool) < NSKBPOOLMAX &&
(skb = new_skb(ETH_ZLEN)))
return skb;
}
return NULL;
}
@ -293,29 +286,22 @@ aoecmd_ata_rw(struct aoedev *d)
skb->dev = t->ifp->nd;
skb = skb_clone(skb, GFP_ATOMIC);
if (skb) {
if (d->sendq_hd)
d->sendq_tl->next = skb;
else
d->sendq_hd = skb;
d->sendq_tl = skb;
}
if (skb)
__skb_queue_tail(&d->sendq, skb);
return 1;
}
/* some callers cannot sleep, and they can call this function,
* transmitting the packets later, when interrupts are on
*/
static struct sk_buff *
aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
static void
aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff_head *queue)
{
struct aoe_hdr *h;
struct aoe_cfghdr *ch;
struct sk_buff *skb, *sl, *sl_tail;
struct sk_buff *skb;
struct net_device *ifp;
sl = sl_tail = NULL;
read_lock(&dev_base_lock);
for_each_netdev(&init_net, ifp) {
dev_hold(ifp);
@ -329,8 +315,7 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
}
skb_put(skb, sizeof *h + sizeof *ch);
skb->dev = ifp;
if (sl_tail == NULL)
sl_tail = skb;
__skb_queue_tail(queue, skb);
h = (struct aoe_hdr *) skb_mac_header(skb);
memset(h, 0, sizeof *h + sizeof *ch);
@ -342,16 +327,10 @@ aoecmd_cfg_pkts(ushort aoemajor, unsigned char aoeminor, struct sk_buff **tail)
h->minor = aoeminor;
h->cmd = AOECMD_CFG;
skb->next = sl;
sl = skb;
cont:
dev_put(ifp);
}
read_unlock(&dev_base_lock);
if (tail != NULL)
*tail = sl_tail;
return sl;
}
static void
@ -406,11 +385,7 @@ resend(struct aoedev *d, struct aoetgt *t, struct frame *f)
skb = skb_clone(skb, GFP_ATOMIC);
if (skb == NULL)
return;
if (d->sendq_hd)
d->sendq_tl->next = skb;
else
d->sendq_hd = skb;
d->sendq_tl = skb;
__skb_queue_tail(&d->sendq, skb);
}
static int
@ -508,16 +483,15 @@ ata_scnt(unsigned char *packet) {
static void
rexmit_timer(ulong vp)
{
struct sk_buff_head queue;
struct aoedev *d;
struct aoetgt *t, **tt, **te;
struct aoeif *ifp;
struct frame *f, *e;
struct sk_buff *sl;
register long timeout;
ulong flags, n;
d = (struct aoedev *) vp;
sl = NULL;
/* timeout is always ~150% of the moving average */
timeout = d->rttavg;
@ -589,7 +563,7 @@ rexmit_timer(ulong vp)
}
}
if (d->sendq_hd) {
if (!skb_queue_empty(&d->sendq)) {
n = d->rttavg <<= 1;
if (n > MAXTIMER)
d->rttavg = MAXTIMER;
@ -600,15 +574,15 @@ rexmit_timer(ulong vp)
aoecmd_work(d);
}
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
__skb_queue_head_init(&queue);
skb_queue_splice_init(&d->sendq, &queue);
d->timer.expires = jiffies + TIMERTICK;
add_timer(&d->timer);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
aoenet_xmit(&queue);
}
/* enters with d->lock held */
@ -767,12 +741,12 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
void
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 frame *f;
struct buf *buf;
struct sk_buff *sl;
struct aoetgt *t;
struct aoeif *ifp;
register long n;
@ -893,21 +867,21 @@ aoecmd_ata_rsp(struct sk_buff *skb)
aoecmd_work(d);
xmit:
sl = d->sendq_hd;
d->sendq_hd = d->sendq_tl = NULL;
__skb_queue_head_init(&queue);
skb_queue_splice_init(&d->sendq, &queue);
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
aoenet_xmit(&queue);
}
void
aoecmd_cfg(ushort aoemajor, unsigned char aoeminor)
{
struct sk_buff *sl;
struct sk_buff_head queue;
sl = aoecmd_cfg_pkts(aoemajor, aoeminor, NULL);
aoenet_xmit(sl);
__skb_queue_head_init(&queue);
aoecmd_cfg_pkts(aoemajor, aoeminor, &queue);
aoenet_xmit(&queue);
}
struct sk_buff *
@ -1076,7 +1050,12 @@ aoecmd_cfg_rsp(struct sk_buff *skb)
spin_unlock_irqrestore(&d->lock, flags);
aoenet_xmit(sl);
if (sl) {
struct sk_buff_head queue;
__skb_queue_head_init(&queue);
__skb_queue_tail(&queue, sl);
aoenet_xmit(&queue);
}
}
void

12
drivers/block/aoe/aoedev.c
View File

@ -188,14 +188,12 @@ skbfree(struct sk_buff *skb)
static void
skbpoolfree(struct aoedev *d)
{
struct sk_buff *skb;
struct sk_buff *skb, *tmp;
while ((skb = d->skbpool_hd)) {
d->skbpool_hd = skb->next;
skb->next = NULL;
skb_queue_walk_safe(&d->skbpool, skb, tmp)
skbfree(skb);
}
d->skbpool_tl = NULL;
__skb_queue_head_init(&d->skbpool);
}
/* find it or malloc it */
@ -217,6 +215,8 @@ aoedev_by_sysminor_m(ulong sysminor)
goto out;
INIT_WORK(&d->work, aoecmd_sleepwork);
spin_lock_init(&d->lock);
skb_queue_head_init(&d->sendq);
skb_queue_head_init(&d->skbpool);
init_timer(&d->timer);
d->timer.data = (ulong) d;
d->timer.function = dummy_timer;

1
drivers/block/aoe/aoemain.c
View File

@ -7,6 +7,7 @@
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include "aoe.h"
MODULE_LICENSE("GPL");

9
drivers/block/aoe/aoenet.c
View File

@ -95,15 +95,12 @@ mac_addr(char addr[6])
}
void
aoenet_xmit(struct sk_buff *sl)
aoenet_xmit(struct sk_buff_head *queue)
{
struct sk_buff *skb;
struct sk_buff *skb, *tmp;
while ((skb = sl)) {
sl = sl->next;
skb->next = skb->prev = NULL;
skb_queue_walk_safe(queue, skb, tmp)
dev_queue_xmit(skb);
}
}
/*