net: wireless: Add CFG80211_ALLOW_RECONNECT option
[linux-2.6.git] / net / sched / sch_red.c
index 00db53e..6649463 100644 (file)
@@ -17,7 +17,6 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <net/pkt_sched.h>
 #include <net/inet_ecn.h>
@@ -37,8 +36,7 @@
        if RED works correctly.
  */
 
-struct red_sched_data
-{
+struct red_sched_data {
        u32                     limit;          /* HARD maximal queue length */
        unsigned char           flags;
        struct red_parms        parms;
@@ -56,7 +54,7 @@ static inline int red_use_harddrop(struct red_sched_data *q)
        return q->flags & TC_RED_HARDDROP;
 }
 
-static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
+static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
        struct red_sched_data *q = qdisc_priv(sch);
        struct Qdisc *child = q->qdisc;
@@ -68,37 +66,35 @@ static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch)
                red_end_of_idle_period(&q->parms);
 
        switch (red_action(&q->parms, q->parms.qavg)) {
-               case RED_DONT_MARK:
-                       break;
-
-               case RED_PROB_MARK:
-                       sch->qstats.overlimits++;
-                       if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
-                               q->stats.prob_drop++;
-                               goto congestion_drop;
-                       }
+       case RED_DONT_MARK:
+               break;
+
+       case RED_PROB_MARK:
+               sch->qstats.overlimits++;
+               if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) {
+                       q->stats.prob_drop++;
+                       goto congestion_drop;
+               }
 
-                       q->stats.prob_mark++;
-                       break;
+               q->stats.prob_mark++;
+               break;
 
-               case RED_HARD_MARK:
-                       sch->qstats.overlimits++;
-                       if (red_use_harddrop(q) || !red_use_ecn(q) ||
-                           !INET_ECN_set_ce(skb)) {
-                               q->stats.forced_drop++;
-                               goto congestion_drop;
-                       }
+       case RED_HARD_MARK:
+               sch->qstats.overlimits++;
+               if (red_use_harddrop(q) || !red_use_ecn(q) ||
+                   !INET_ECN_set_ce(skb)) {
+                       q->stats.forced_drop++;
+                       goto congestion_drop;
+               }
 
-                       q->stats.forced_mark++;
-                       break;
+               q->stats.forced_mark++;
+               break;
        }
 
-       ret = child->enqueue(skb, child);
+       ret = qdisc_enqueue(skb, child);
        if (likely(ret == NET_XMIT_SUCCESS)) {
-               sch->bstats.bytes += skb->len;
-               sch->bstats.packets++;
                sch->q.qlen++;
-       } else {
+       } else if (net_xmit_drop_count(ret)) {
                q->stats.pdrop++;
                sch->qstats.drops++;
        }
@@ -109,39 +105,32 @@ congestion_drop:
        return NET_XMIT_CN;
 }
 
-static int red_requeue(struct sk_buff *skb, struct Qdisc* sch)
+static struct sk_buff *red_dequeue(struct Qdisc *sch)
 {
+       struct sk_buff *skb;
        struct red_sched_data *q = qdisc_priv(sch);
        struct Qdisc *child = q->qdisc;
-       int ret;
-
-       if (red_is_idling(&q->parms))
-               red_end_of_idle_period(&q->parms);
 
-       ret = child->ops->requeue(skb, child);
-       if (likely(ret == NET_XMIT_SUCCESS)) {
-               sch->qstats.requeues++;
-               sch->q.qlen++;
+       skb = child->dequeue(child);
+       if (skb) {
+               qdisc_bstats_update(sch, skb);
+               sch->q.qlen--;
+       } else {
+               if (!red_is_idling(&q->parms))
+                       red_start_of_idle_period(&q->parms);
        }
-       return ret;
+       return skb;
 }
 
-static struct sk_buff * red_dequeue(struct Qdisc* sch)
+static struct sk_buff *red_peek(struct Qdisc *sch)
 {
-       struct sk_buff *skb;
        struct red_sched_data *q = qdisc_priv(sch);
        struct Qdisc *child = q->qdisc;
 
-       skb = child->dequeue(child);
-       if (skb)
-               sch->q.qlen--;
-       else if (!red_is_idling(&q->parms))
-               red_start_of_idle_period(&q->parms);
-
-       return skb;
+       return child->ops->peek(child);
 }
 
-static unsigned int red_drop(struct Qdisc* sch)
+static unsigned int red_drop(struct Qdisc *sch)
 {
        struct red_sched_data *q = qdisc_priv(sch);
        struct Qdisc *child = q->qdisc;
@@ -160,7 +149,7 @@ static unsigned int red_drop(struct Qdisc* sch)
        return 0;
 }
 
-static void red_reset(struct Qdisc* sch)
+static void red_reset(struct Qdisc *sch)
 {
        struct red_sched_data *q = qdisc_priv(sch);
 
@@ -175,55 +164,36 @@ static void red_destroy(struct Qdisc *sch)
        qdisc_destroy(q->qdisc);
 }
 
-static struct Qdisc *red_create_dflt(struct Qdisc *sch, u32 limit)
-{
-       struct Qdisc *q;
-       struct rtattr *rta;
-       int ret;
-
-       q = qdisc_create_dflt(sch->dev, &bfifo_qdisc_ops,
-                             TC_H_MAKE(sch->handle, 1));
-       if (q) {
-               rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)),
-                             GFP_KERNEL);
-               if (rta) {
-                       rta->rta_type = RTM_NEWQDISC;
-                       rta->rta_len = RTA_LENGTH(sizeof(struct tc_fifo_qopt));
-                       ((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit;
-
-                       ret = q->ops->change(q, rta);
-                       kfree(rta);
-
-                       if (ret == 0)
-                               return q;
-               }
-               qdisc_destroy(q);
-       }
-       return NULL;
-}
+static const struct nla_policy red_policy[TCA_RED_MAX + 1] = {
+       [TCA_RED_PARMS] = { .len = sizeof(struct tc_red_qopt) },
+       [TCA_RED_STAB]  = { .len = RED_STAB_SIZE },
+};
 
-static int red_change(struct Qdisc *sch, struct rtattr *opt)
+static int red_change(struct Qdisc *sch, struct nlattr *opt)
 {
        struct red_sched_data *q = qdisc_priv(sch);
-       struct rtattr *tb[TCA_RED_MAX];
+       struct nlattr *tb[TCA_RED_MAX + 1];
        struct tc_red_qopt *ctl;
        struct Qdisc *child = NULL;
+       int err;
 
-       if (opt == NULL || rtattr_parse_nested(tb, TCA_RED_MAX, opt))
+       if (opt == NULL)
                return -EINVAL;
 
-       if (tb[TCA_RED_PARMS-1] == NULL ||
-           RTA_PAYLOAD(tb[TCA_RED_PARMS-1]) < sizeof(*ctl) ||
-           tb[TCA_RED_STAB-1] == NULL ||
-           RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < RED_STAB_SIZE)
+       err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy);
+       if (err < 0)
+               return err;
+
+       if (tb[TCA_RED_PARMS] == NULL ||
+           tb[TCA_RED_STAB] == NULL)
                return -EINVAL;
 
-       ctl = RTA_DATA(tb[TCA_RED_PARMS-1]);
+       ctl = nla_data(tb[TCA_RED_PARMS]);
 
        if (ctl->limit > 0) {
-               child = red_create_dflt(sch, ctl->limit);
-               if (child == NULL)
-                       return -ENOMEM;
+               child = fifo_create_dflt(sch, &bfifo_qdisc_ops, ctl->limit);
+               if (IS_ERR(child))
+                       return PTR_ERR(child);
        }
 
        sch_tree_lock(sch);
@@ -231,12 +201,13 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
        q->limit = ctl->limit;
        if (child) {
                qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
-               qdisc_destroy(xchg(&q->qdisc, child));
+               qdisc_destroy(q->qdisc);
+               q->qdisc = child;
        }
 
        red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
                                 ctl->Plog, ctl->Scell_log,
-                                RTA_DATA(tb[TCA_RED_STAB-1]));
+                                nla_data(tb[TCA_RED_STAB]));
 
        if (skb_queue_empty(&sch->q))
                red_end_of_idle_period(&q->parms);
@@ -245,7 +216,7 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt)
        return 0;
 }
 
-static int red_init(struct Qdisc* sch, struct rtattr *opt)
+static int red_init(struct Qdisc *sch, struct nlattr *opt)
 {
        struct red_sched_data *q = qdisc_priv(sch);
 
@@ -256,7 +227,7 @@ static int red_init(struct Qdisc* sch, struct rtattr *opt)
 static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
 {
        struct red_sched_data *q = qdisc_priv(sch);
-       struct rtattr *opts = NULL;
+       struct nlattr *opts = NULL;
        struct tc_red_qopt opt = {
                .limit          = q->limit,
                .flags          = q->flags,
@@ -267,12 +238,16 @@ static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
                .Scell_log      = q->parms.Scell_log,
        };
 
-       opts = RTA_NEST(skb, TCA_OPTIONS);
-       RTA_PUT(skb, TCA_RED_PARMS, sizeof(opt), &opt);
-       return RTA_NEST_END(skb, opts);
+       sch->qstats.backlog = q->qdisc->qstats.backlog;
+       opts = nla_nest_start(skb, TCA_OPTIONS);
+       if (opts == NULL)
+               goto nla_put_failure;
+       NLA_PUT(skb, TCA_RED_PARMS, sizeof(opt), &opt);
+       return nla_nest_end(skb, opts);
 
-rtattr_failure:
-       return RTA_NEST_CANCEL(skb, opts);
+nla_put_failure:
+       nla_nest_cancel(skb, opts);
+       return -EMSGSIZE;
 }
 
 static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
@@ -293,8 +268,6 @@ static int red_dump_class(struct Qdisc *sch, unsigned long cl,
 {
        struct red_sched_data *q = qdisc_priv(sch);
 
-       if (cl != 1)
-               return -ENOENT;
        tcm->tcm_handle |= TC_H_MIN(1);
        tcm->tcm_info = q->qdisc->handle;
        return 0;
@@ -309,7 +282,8 @@ static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
                new = &noop_qdisc;
 
        sch_tree_lock(sch);
-       *old = xchg(&q->qdisc, new);
+       *old = q->qdisc;
+       q->qdisc = new;
        qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
        qdisc_reset(*old);
        sch_tree_unlock(sch);
@@ -329,18 +303,6 @@ static unsigned long red_get(struct Qdisc *sch, u32 classid)
 
 static void red_put(struct Qdisc *sch, unsigned long arg)
 {
-       return;
-}
-
-static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
-                           struct rtattr **tca, unsigned long *arg)
-{
-       return -ENOSYS;
-}
-
-static int red_delete(struct Qdisc *sch, unsigned long cl)
-{
-       return -ENOSYS;
 }
 
 static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
@@ -355,30 +317,22 @@ static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
        }
 }
 
-static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
-       return NULL;
-}
-
-static struct Qdisc_class_ops red_class_ops = {
+static const struct Qdisc_class_ops red_class_ops = {
        .graft          =       red_graft,
        .leaf           =       red_leaf,
        .get            =       red_get,
        .put            =       red_put,
-       .change         =       red_change_class,
-       .delete         =       red_delete,
        .walk           =       red_walk,
-       .tcf_chain      =       red_find_tcf,
        .dump           =       red_dump_class,
 };
 
-static struct Qdisc_ops red_qdisc_ops = {
+static struct Qdisc_ops red_qdisc_ops __read_mostly = {
        .id             =       "red",
        .priv_size      =       sizeof(struct red_sched_data),
        .cl_ops         =       &red_class_ops,
        .enqueue        =       red_enqueue,
        .dequeue        =       red_dequeue,
-       .requeue        =       red_requeue,
+       .peek           =       red_peek,
        .drop           =       red_drop,
        .init           =       red_init,
        .reset          =       red_reset,