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421 lines
8.8 KiB
421 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2008, Intel Corporation. |
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* |
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* Author: Alexander Duyck <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/skbuff.h> |
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#include <net/netlink.h> |
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#include <net/pkt_sched.h> |
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#include <net/pkt_cls.h> |
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struct multiq_sched_data { |
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u16 bands; |
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u16 max_bands; |
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u16 curband; |
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struct tcf_proto __rcu *filter_list; |
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struct tcf_block *block; |
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struct Qdisc **queues; |
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}; |
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static struct Qdisc * |
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multiq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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u32 band; |
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struct tcf_result res; |
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struct tcf_proto *fl = rcu_dereference_bh(q->filter_list); |
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int err; |
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
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err = tcf_classify(skb, fl, &res, false); |
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#ifdef CONFIG_NET_CLS_ACT |
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switch (err) { |
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case TC_ACT_STOLEN: |
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case TC_ACT_QUEUED: |
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case TC_ACT_TRAP: |
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
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fallthrough; |
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case TC_ACT_SHOT: |
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return NULL; |
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} |
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#endif |
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band = skb_get_queue_mapping(skb); |
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if (band >= q->bands) |
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return q->queues[0]; |
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return q->queues[band]; |
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} |
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static int |
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multiq_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
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struct sk_buff **to_free) |
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{ |
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struct Qdisc *qdisc; |
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int ret; |
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qdisc = multiq_classify(skb, sch, &ret); |
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#ifdef CONFIG_NET_CLS_ACT |
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if (qdisc == NULL) { |
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if (ret & __NET_XMIT_BYPASS) |
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qdisc_qstats_drop(sch); |
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__qdisc_drop(skb, to_free); |
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return ret; |
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} |
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#endif |
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ret = qdisc_enqueue(skb, qdisc, to_free); |
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if (ret == NET_XMIT_SUCCESS) { |
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sch->q.qlen++; |
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return NET_XMIT_SUCCESS; |
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} |
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if (net_xmit_drop_count(ret)) |
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qdisc_qstats_drop(sch); |
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return ret; |
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} |
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static struct sk_buff *multiq_dequeue(struct Qdisc *sch) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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struct Qdisc *qdisc; |
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struct sk_buff *skb; |
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int band; |
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for (band = 0; band < q->bands; band++) { |
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/* cycle through bands to ensure fairness */ |
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q->curband++; |
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if (q->curband >= q->bands) |
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q->curband = 0; |
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/* Check that target subqueue is available before |
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* pulling an skb to avoid head-of-line blocking. |
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*/ |
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if (!netif_xmit_stopped( |
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netdev_get_tx_queue(qdisc_dev(sch), q->curband))) { |
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qdisc = q->queues[q->curband]; |
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skb = qdisc->dequeue(qdisc); |
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if (skb) { |
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qdisc_bstats_update(sch, skb); |
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sch->q.qlen--; |
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return skb; |
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} |
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} |
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} |
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return NULL; |
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} |
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static struct sk_buff *multiq_peek(struct Qdisc *sch) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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unsigned int curband = q->curband; |
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struct Qdisc *qdisc; |
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struct sk_buff *skb; |
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int band; |
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for (band = 0; band < q->bands; band++) { |
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/* cycle through bands to ensure fairness */ |
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curband++; |
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if (curband >= q->bands) |
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curband = 0; |
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/* Check that target subqueue is available before |
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* pulling an skb to avoid head-of-line blocking. |
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*/ |
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if (!netif_xmit_stopped( |
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netdev_get_tx_queue(qdisc_dev(sch), curband))) { |
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qdisc = q->queues[curband]; |
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skb = qdisc->ops->peek(qdisc); |
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if (skb) |
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return skb; |
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} |
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} |
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return NULL; |
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} |
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static void |
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multiq_reset(struct Qdisc *sch) |
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{ |
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u16 band; |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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for (band = 0; band < q->bands; band++) |
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qdisc_reset(q->queues[band]); |
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sch->q.qlen = 0; |
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q->curband = 0; |
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} |
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static void |
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multiq_destroy(struct Qdisc *sch) |
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{ |
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int band; |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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tcf_block_put(q->block); |
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for (band = 0; band < q->bands; band++) |
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qdisc_put(q->queues[band]); |
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kfree(q->queues); |
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} |
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static int multiq_tune(struct Qdisc *sch, struct nlattr *opt, |
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struct netlink_ext_ack *extack) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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struct tc_multiq_qopt *qopt; |
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struct Qdisc **removed; |
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int i, n_removed = 0; |
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if (!netif_is_multiqueue(qdisc_dev(sch))) |
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return -EOPNOTSUPP; |
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if (nla_len(opt) < sizeof(*qopt)) |
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return -EINVAL; |
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qopt = nla_data(opt); |
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qopt->bands = qdisc_dev(sch)->real_num_tx_queues; |
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removed = kmalloc(sizeof(*removed) * (q->max_bands - q->bands), |
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GFP_KERNEL); |
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if (!removed) |
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return -ENOMEM; |
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sch_tree_lock(sch); |
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q->bands = qopt->bands; |
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for (i = q->bands; i < q->max_bands; i++) { |
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if (q->queues[i] != &noop_qdisc) { |
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struct Qdisc *child = q->queues[i]; |
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q->queues[i] = &noop_qdisc; |
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qdisc_purge_queue(child); |
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removed[n_removed++] = child; |
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} |
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} |
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sch_tree_unlock(sch); |
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for (i = 0; i < n_removed; i++) |
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qdisc_put(removed[i]); |
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kfree(removed); |
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for (i = 0; i < q->bands; i++) { |
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if (q->queues[i] == &noop_qdisc) { |
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struct Qdisc *child, *old; |
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child = qdisc_create_dflt(sch->dev_queue, |
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&pfifo_qdisc_ops, |
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TC_H_MAKE(sch->handle, |
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i + 1), extack); |
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if (child) { |
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sch_tree_lock(sch); |
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old = q->queues[i]; |
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q->queues[i] = child; |
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if (child != &noop_qdisc) |
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qdisc_hash_add(child, true); |
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if (old != &noop_qdisc) |
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qdisc_purge_queue(old); |
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sch_tree_unlock(sch); |
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qdisc_put(old); |
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} |
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} |
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} |
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return 0; |
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} |
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static int multiq_init(struct Qdisc *sch, struct nlattr *opt, |
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struct netlink_ext_ack *extack) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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int i, err; |
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q->queues = NULL; |
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if (!opt) |
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return -EINVAL; |
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err = tcf_block_get(&q->block, &q->filter_list, sch, extack); |
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if (err) |
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return err; |
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q->max_bands = qdisc_dev(sch)->num_tx_queues; |
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q->queues = kcalloc(q->max_bands, sizeof(struct Qdisc *), GFP_KERNEL); |
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if (!q->queues) |
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return -ENOBUFS; |
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for (i = 0; i < q->max_bands; i++) |
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q->queues[i] = &noop_qdisc; |
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return multiq_tune(sch, opt, extack); |
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} |
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static int multiq_dump(struct Qdisc *sch, struct sk_buff *skb) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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unsigned char *b = skb_tail_pointer(skb); |
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struct tc_multiq_qopt opt; |
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opt.bands = q->bands; |
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opt.max_bands = q->max_bands; |
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if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
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goto nla_put_failure; |
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return skb->len; |
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nla_put_failure: |
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nlmsg_trim(skb, b); |
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return -1; |
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} |
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static int multiq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
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struct Qdisc **old, struct netlink_ext_ack *extack) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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unsigned long band = arg - 1; |
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if (new == NULL) |
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new = &noop_qdisc; |
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*old = qdisc_replace(sch, new, &q->queues[band]); |
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return 0; |
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} |
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static struct Qdisc * |
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multiq_leaf(struct Qdisc *sch, unsigned long arg) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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unsigned long band = arg - 1; |
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return q->queues[band]; |
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} |
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static unsigned long multiq_find(struct Qdisc *sch, u32 classid) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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unsigned long band = TC_H_MIN(classid); |
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if (band - 1 >= q->bands) |
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return 0; |
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return band; |
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} |
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static unsigned long multiq_bind(struct Qdisc *sch, unsigned long parent, |
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u32 classid) |
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{ |
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return multiq_find(sch, classid); |
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} |
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static void multiq_unbind(struct Qdisc *q, unsigned long cl) |
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{ |
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} |
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static int multiq_dump_class(struct Qdisc *sch, unsigned long cl, |
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struct sk_buff *skb, struct tcmsg *tcm) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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tcm->tcm_handle |= TC_H_MIN(cl); |
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tcm->tcm_info = q->queues[cl - 1]->handle; |
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return 0; |
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} |
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static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl, |
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struct gnet_dump *d) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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struct Qdisc *cl_q; |
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cl_q = q->queues[cl - 1]; |
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if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
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d, cl_q->cpu_bstats, &cl_q->bstats) < 0 || |
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qdisc_qstats_copy(d, cl_q) < 0) |
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return -1; |
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return 0; |
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} |
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static void multiq_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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int band; |
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if (arg->stop) |
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return; |
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for (band = 0; band < q->bands; band++) { |
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if (arg->count < arg->skip) { |
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arg->count++; |
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continue; |
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} |
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if (arg->fn(sch, band + 1, arg) < 0) { |
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arg->stop = 1; |
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break; |
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} |
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arg->count++; |
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} |
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} |
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static struct tcf_block *multiq_tcf_block(struct Qdisc *sch, unsigned long cl, |
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struct netlink_ext_ack *extack) |
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{ |
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struct multiq_sched_data *q = qdisc_priv(sch); |
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if (cl) |
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return NULL; |
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return q->block; |
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} |
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static const struct Qdisc_class_ops multiq_class_ops = { |
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.graft = multiq_graft, |
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.leaf = multiq_leaf, |
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.find = multiq_find, |
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.walk = multiq_walk, |
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.tcf_block = multiq_tcf_block, |
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.bind_tcf = multiq_bind, |
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.unbind_tcf = multiq_unbind, |
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.dump = multiq_dump_class, |
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.dump_stats = multiq_dump_class_stats, |
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}; |
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static struct Qdisc_ops multiq_qdisc_ops __read_mostly = { |
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.next = NULL, |
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.cl_ops = &multiq_class_ops, |
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.id = "multiq", |
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.priv_size = sizeof(struct multiq_sched_data), |
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.enqueue = multiq_enqueue, |
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.dequeue = multiq_dequeue, |
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.peek = multiq_peek, |
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.init = multiq_init, |
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.reset = multiq_reset, |
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.destroy = multiq_destroy, |
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.change = multiq_tune, |
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.dump = multiq_dump, |
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.owner = THIS_MODULE, |
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}; |
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static int __init multiq_module_init(void) |
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{ |
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return register_qdisc(&multiq_qdisc_ops); |
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} |
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static void __exit multiq_module_exit(void) |
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{ |
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unregister_qdisc(&multiq_qdisc_ops); |
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} |
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module_init(multiq_module_init) |
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module_exit(multiq_module_exit) |
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MODULE_LICENSE("GPL");
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