From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/sched/sch_mq.c | 275 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 275 insertions(+) create mode 100644 net/sched/sch_mq.c (limited to 'net/sched/sch_mq.c') diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c new file mode 100644 index 000000000..c860119a8 --- /dev/null +++ b/net/sched/sch_mq.c @@ -0,0 +1,275 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * net/sched/sch_mq.c Classful multiqueue dummy scheduler + * + * Copyright (c) 2009 Patrick McHardy + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct mq_sched { + struct Qdisc **qdiscs; +}; + +static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd) +{ + struct net_device *dev = qdisc_dev(sch); + struct tc_mq_qopt_offload opt = { + .command = cmd, + .handle = sch->handle, + }; + + if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) + return -EOPNOTSUPP; + + return dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_MQ, &opt); +} + +static int mq_offload_stats(struct Qdisc *sch) +{ + struct tc_mq_qopt_offload opt = { + .command = TC_MQ_STATS, + .handle = sch->handle, + .stats = { + .bstats = &sch->bstats, + .qstats = &sch->qstats, + }, + }; + + return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_MQ, &opt); +} + +static void mq_destroy(struct Qdisc *sch) +{ + struct net_device *dev = qdisc_dev(sch); + struct mq_sched *priv = qdisc_priv(sch); + unsigned int ntx; + + mq_offload(sch, TC_MQ_DESTROY); + + if (!priv->qdiscs) + return; + for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++) + qdisc_put(priv->qdiscs[ntx]); + kfree(priv->qdiscs); +} + +static int mq_init(struct Qdisc *sch, struct nlattr *opt, + struct netlink_ext_ack *extack) +{ + 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) + return -ENOMEM; + + for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { + dev_queue = netdev_get_tx_queue(dev, ntx); + qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx), + TC_H_MAKE(TC_H_MAJ(sch->handle), + TC_H_MIN(ntx + 1)), + extack); + if (!qdisc) + return -ENOMEM; + priv->qdiscs[ntx] = qdisc; + qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; + } + + sch->flags |= TCQ_F_MQROOT; + + mq_offload(sch, TC_MQ_CREATE); + return 0; +} + +static void mq_attach(struct Qdisc *sch) +{ + struct net_device *dev = qdisc_dev(sch); + struct mq_sched *priv = qdisc_priv(sch); + struct Qdisc *qdisc, *old; + unsigned int ntx; + + for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { + qdisc = priv->qdiscs[ntx]; + old = dev_graft_qdisc(qdisc->dev_queue, qdisc); + if (old) + qdisc_put(old); +#ifdef CONFIG_NET_SCHED + if (ntx < dev->real_num_tx_queues) + qdisc_hash_add(qdisc, false); +#endif + + } + 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; + gnet_stats_basic_sync_init(&sch->bstats); + memset(&sch->qstats, 0, sizeof(sch->qstats)); + + /* MQ supports lockless qdiscs. However, statistics accounting needs + * to account for all, none, or a mix of locked and unlocked child + * qdiscs. Percpu stats are added to counters in-band and locking + * qdisc totals are added at end. + */ + for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { + qdisc = rtnl_dereference(netdev_get_tx_queue(dev, ntx)->qdisc_sleeping); + spin_lock_bh(qdisc_lock(qdisc)); + + gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats, + &qdisc->bstats, false); + gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats, + &qdisc->qstats); + sch->q.qlen += qdisc_qlen(qdisc); + + spin_unlock_bh(qdisc_lock(qdisc)); + } + + return mq_offload_stats(sch); +} + +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 struct netdev_queue *mq_select_queue(struct Qdisc *sch, + struct tcmsg *tcm) +{ + return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent)); +} + +static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new, + struct Qdisc **old, struct netlink_ext_ack *extack) +{ + struct netdev_queue *dev_queue = mq_queue_get(sch, cl); + struct tc_mq_qopt_offload graft_offload; + struct net_device *dev = qdisc_dev(sch); + + if (dev->flags & IFF_UP) + dev_deactivate(dev); + + *old = dev_graft_qdisc(dev_queue, new); + if (new) + new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; + if (dev->flags & IFF_UP) + dev_activate(dev); + + graft_offload.handle = sch->handle; + graft_offload.graft_params.queue = cl - 1; + graft_offload.graft_params.child_handle = new ? new->handle : 0; + graft_offload.command = TC_MQ_GRAFT; + + qdisc_offload_graft_helper(qdisc_dev(sch), sch, new, *old, + TC_SETUP_QDISC_MQ, &graft_offload, extack); + return 0; +} + +static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl) +{ + struct netdev_queue *dev_queue = mq_queue_get(sch, cl); + + return rtnl_dereference(dev_queue->qdisc_sleeping); +} + +static unsigned long mq_find(struct Qdisc *sch, u32 classid) +{ + unsigned int ntx = TC_H_MIN(classid); + + if (!mq_queue_get(sch, ntx)) + return 0; + return ntx; +} + +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 = rtnl_dereference(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 = rtnl_dereference(dev_queue->qdisc_sleeping); + if (gnet_stats_copy_basic(d, sch->cpu_bstats, &sch->bstats, true) < 0 || + qdisc_qstats_copy(d, sch) < 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 (!tc_qdisc_stats_dump(sch, ntx + 1, arg)) + break; + } +} + +static const struct Qdisc_class_ops mq_class_ops = { + .select_queue = mq_select_queue, + .graft = mq_graft, + .leaf = mq_leaf, + .find = mq_find, + .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, + .change_real_num_tx = mq_change_real_num_tx, + .dump = mq_dump, + .owner = THIS_MODULE, +}; -- cgit v1.2.3