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

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 56 insertions, 76 deletions

diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 5b4c6e649c11..93f3690396a5 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -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);
 
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 0c39782b2660..fd2cf5439a1c 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -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;
 }
diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c
index 181ebb85f0be..1f56d2c5b7fc 100644
--- a/drivers/block/aoe/aoechr.c
+++ b/drivers/block/aoe/aoechr.c
@@ -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;
 }
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 2f1746295d06..e33da30be4c4 100644
--- 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
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index a1d813ab0d6b..75a610adf515 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -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;
diff --git a/drivers/block/aoe/aoemain.c b/drivers/block/aoe/aoemain.c
index 7b15a5e9cec0..7f83ad90e76f 100644
--- a/drivers/block/aoe/aoemain.c
+++ b/drivers/block/aoe/aoemain.c
@@ -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");
diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c
index 0c81ca731287..8fb26030eba8 100644
--- a/drivers/block/aoe/aoenet.c
+++ b/drivers/block/aoe/aoenet.c
@@ -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);
-        }
 }
 
 /*