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

[linux-2.6-omap-h63xx.git] / drivers / block / aoe / aoecmd.c

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 2f1746295d06fc438ac4b1ba923c2aeb1d634dd8..e33da30be4c4cc62a88f99e5b9799614e9e731ec 100644 (file)
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -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;
-
-       sl = aoecmd_cfg_pkts(aoemajor, aoeminor, NULL);
+       struct sk_buff_head queue;
 
-       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