1 files changed, 235 insertions, 0 deletions

diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
new file mode 100644
index 000000000000..dd5ee022f1f7
--- /dev/null
+++ b/net/sched/sch_mq.c
@@ -0,0 +1,235 @@
+/*
+ * net/sched/sch_mq.c           Classful multiqueue dummy scheduler
+ *
+ * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+
+struct mq_sched {
+        struct Qdisc            **qdiscs;
+};
+
+static void mq_destroy(struct Qdisc *sch)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        struct mq_sched *priv = qdisc_priv(sch);
+        unsigned int ntx;
+
+        if (!priv->qdiscs)
+                return;
+        for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
+                qdisc_destroy(priv->qdiscs[ntx]);
+        kfree(priv->qdiscs);
+}
+
+static int mq_init(struct Qdisc *sch, struct nlattr *opt)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        struct mq_sched *priv = qdisc_priv(sch);
+        struct netdev_queue *dev_queue;
+        struct Qdisc *qdisc;
+        unsigned int ntx;
+
+        if (sch->parent != TC_H_ROOT)
+                return -EOPNOTSUPP;
+
+        if (!netif_is_multiqueue(dev))
+                return -EOPNOTSUPP;
+
+        /* pre-allocate qdiscs, attachment can't fail */
+        priv->qdiscs = kcalloc(dev->num_tx_queues, sizeof(priv->qdiscs[0]),
+                               GFP_KERNEL);
+        if (priv->qdiscs == NULL)
+                return -ENOMEM;
+
+        for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
+                dev_queue = netdev_get_tx_queue(dev, ntx);
+                qdisc = qdisc_create_dflt(dev, dev_queue, &pfifo_fast_ops,
+                                          TC_H_MAKE(TC_H_MAJ(sch->handle),
+                                                    TC_H_MIN(ntx + 1)));
+                if (qdisc == NULL)
+                        goto err;
+                qdisc->flags |= TCQ_F_CAN_BYPASS;
+                priv->qdiscs[ntx] = qdisc;
+        }
+
+        sch->flags |= TCQ_F_MQROOT;
+        return 0;
+
+err:
+        mq_destroy(sch);
+        return -ENOMEM;
+}
+
+static void mq_attach(struct Qdisc *sch)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        struct mq_sched *priv = qdisc_priv(sch);
+        struct Qdisc *qdisc;
+        unsigned int ntx;
+
+        for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
+                qdisc = priv->qdiscs[ntx];
+                qdisc = dev_graft_qdisc(qdisc->dev_queue, qdisc);
+                if (qdisc)
+                        qdisc_destroy(qdisc);
+        }
+        kfree(priv->qdiscs);
+        priv->qdiscs = NULL;
+}
+
+static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        struct Qdisc *qdisc;
+        unsigned int ntx;
+
+        sch->q.qlen = 0;
+        memset(&sch->bstats, 0, sizeof(sch->bstats));
+        memset(&sch->qstats, 0, sizeof(sch->qstats));
+
+        for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
+                qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
+                spin_lock_bh(qdisc_lock(qdisc));
+                sch->q.qlen             += qdisc->q.qlen;
+                sch->bstats.bytes       += qdisc->bstats.bytes;
+                sch->bstats.packets     += qdisc->bstats.packets;
+                sch->qstats.qlen        += qdisc->qstats.qlen;
+                sch->qstats.backlog     += qdisc->qstats.backlog;
+                sch->qstats.drops       += qdisc->qstats.drops;
+                sch->qstats.requeues    += qdisc->qstats.requeues;
+                sch->qstats.overlimits  += qdisc->qstats.overlimits;
+                spin_unlock_bh(qdisc_lock(qdisc));
+        }
+        return 0;
+}
+
+static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        unsigned long ntx = cl - 1;
+
+        if (ntx >= dev->num_tx_queues)
+                return NULL;
+        return netdev_get_tx_queue(dev, ntx);
+}
+
+static unsigned int mq_select_queue(struct Qdisc *sch, struct tcmsg *tcm)
+{
+        unsigned int ntx = TC_H_MIN(tcm->tcm_parent);
+
+        if (!mq_queue_get(sch, ntx))
+                return 0;
+        return ntx - 1;
+}
+
+static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
+                    struct Qdisc **old)
+{
+        struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
+        struct net_device *dev = qdisc_dev(sch);
+
+        if (dev->flags & IFF_UP)
+                dev_deactivate(dev);
+
+        *old = dev_graft_qdisc(dev_queue, new);
+
+        if (dev->flags & IFF_UP)
+                dev_activate(dev);
+        return 0;
+}
+
+static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
+{
+        struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
+
+        return dev_queue->qdisc_sleeping;
+}
+
+static unsigned long mq_get(struct Qdisc *sch, u32 classid)
+{
+        unsigned int ntx = TC_H_MIN(classid);
+
+        if (!mq_queue_get(sch, ntx))
+                return 0;
+        return ntx;
+}
+
+static void mq_put(struct Qdisc *sch, unsigned long cl)
+{
+        return;
+}
+
+static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
+                         struct sk_buff *skb, struct tcmsg *tcm)
+{
+        struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
+
+        tcm->tcm_parent = TC_H_ROOT;
+        tcm->tcm_handle |= TC_H_MIN(cl);
+        tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
+        return 0;
+}
+
+static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
+                               struct gnet_dump *d)
+{
+        struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
+
+        sch = dev_queue->qdisc_sleeping;
+        if (gnet_stats_copy_basic(d, &sch->bstats) < 0 ||
+            gnet_stats_copy_queue(d, &sch->qstats) < 0)
+                return -1;
+        return 0;
+}
+
+static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
+{
+        struct net_device *dev = qdisc_dev(sch);
+        unsigned int ntx;
+
+        if (arg->stop)
+                return;
+
+        arg->count = arg->skip;
+        for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
+                if (arg->fn(sch, ntx + 1, arg) < 0) {
+                        arg->stop = 1;
+                        break;
+                }
+                arg->count++;
+        }
+}
+
+static const struct Qdisc_class_ops mq_class_ops = {
+        .select_queue   = mq_select_queue,
+        .graft          = mq_graft,
+        .leaf           = mq_leaf,
+        .get            = mq_get,
+        .put            = mq_put,
+        .walk           = mq_walk,
+        .dump           = mq_dump_class,
+        .dump_stats     = mq_dump_class_stats,
+};
+
+struct Qdisc_ops mq_qdisc_ops __read_mostly = {
+        .cl_ops         = &mq_class_ops,
+        .id             = "mq",
+        .priv_size      = sizeof(struct mq_sched),
+        .init           = mq_init,
+        .destroy        = mq_destroy,
+        .attach         = mq_attach,
+        .dump           = mq_dump,
+        .owner          = THIS_MODULE,
+};