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![Alexander Duyck](/assets/img/avatar_default.png)
Currently dequeueing a packet and requeueing the same packet will cause a different packet to be pulled on the next dequeue. This change forces requeue to rewind the current_band. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
477 lines
9.8 KiB
C
477 lines
9.8 KiB
C
/*
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* Copyright (c) 2008, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Author: Alexander Duyck <alexander.h.duyck@intel.com>
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*/
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#include <linux/module.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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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 *filter_list;
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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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int err;
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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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err = tc_classify(skb, q->filter_list, &res);
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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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*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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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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{
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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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sch->qstats.drops++;
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kfree_skb(skb);
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return ret;
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}
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#endif
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ret = qdisc_enqueue(skb, qdisc);
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if (ret == NET_XMIT_SUCCESS) {
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sch->bstats.bytes += qdisc_pkt_len(skb);
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sch->bstats.packets++;
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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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sch->qstats.drops++;
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return ret;
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}
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static int
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multiq_requeue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct Qdisc *qdisc;
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struct multiq_sched_data *q = qdisc_priv(sch);
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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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sch->qstats.drops++;
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kfree_skb(skb);
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return ret;
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}
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#endif
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ret = qdisc->ops->requeue(skb, qdisc);
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if (ret == NET_XMIT_SUCCESS) {
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sch->q.qlen++;
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sch->qstats.requeues++;
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if (q->curband)
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q->curband--;
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else
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q->curband = q->bands - 1;
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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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sch->qstats.drops++;
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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 excessive requeues
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*/
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if (!__netif_subqueue_stopped(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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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 unsigned int multiq_drop(struct Qdisc *sch)
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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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unsigned int len;
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struct Qdisc *qdisc;
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for (band = q->bands-1; band >= 0; band--) {
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qdisc = q->queues[band];
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if (qdisc->ops->drop) {
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len = qdisc->ops->drop(qdisc);
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if (len != 0) {
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sch->q.qlen--;
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return len;
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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 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_destroy_chain(&q->filter_list);
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for (band = 0; band < q->bands; band++)
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qdisc_destroy(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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{
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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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int i;
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if (!netif_is_multiqueue(qdisc_dev(sch)))
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return -EINVAL;
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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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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 = xchg(&q->queues[i], &noop_qdisc);
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qdisc_tree_decrease_qlen(child, child->q.qlen);
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qdisc_destroy(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 < q->bands; i++) {
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if (q->queues[i] == &noop_qdisc) {
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struct Qdisc *child;
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child = qdisc_create_dflt(qdisc_dev(sch),
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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));
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if (child) {
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sch_tree_lock(sch);
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child = xchg(&q->queues[i], child);
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if (child != &noop_qdisc) {
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qdisc_tree_decrease_qlen(child,
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child->q.qlen);
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qdisc_destroy(child);
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}
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sch_tree_unlock(sch);
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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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{
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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 == NULL)
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return -EINVAL;
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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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err = multiq_tune(sch,opt);
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if (err)
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kfree(q->queues);
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return err;
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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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NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
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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)
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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 (band >= q->bands)
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return -EINVAL;
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if (new == NULL)
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new = &noop_qdisc;
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sch_tree_lock(sch);
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*old = q->queues[band];
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q->queues[band] = new;
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qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
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qdisc_reset(*old);
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sch_tree_unlock(sch);
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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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if (band >= q->bands)
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return NULL;
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return q->queues[band];
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}
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static unsigned long multiq_get(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_get(sch, classid);
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}
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static void multiq_put(struct Qdisc *q, unsigned long cl)
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{
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return;
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}
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static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
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struct nlattr **tca, unsigned long *arg)
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{
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unsigned long cl = *arg;
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struct multiq_sched_data *q = qdisc_priv(sch);
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if (cl - 1 > q->bands)
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return -ENOENT;
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return 0;
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}
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static int multiq_delete(struct Qdisc *sch, unsigned long cl)
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{
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struct multiq_sched_data *q = qdisc_priv(sch);
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if (cl - 1 > q->bands)
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return -ENOENT;
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return 0;
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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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if (cl - 1 > q->bands)
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return -ENOENT;
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tcm->tcm_handle |= TC_H_MIN(cl);
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if (q->queues[cl-1])
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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(d, &cl_q->bstats) < 0 ||
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gnet_stats_copy_queue(d, &cl_q->qstats) < 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_proto **multiq_find_tcf(struct Qdisc *sch, unsigned long cl)
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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->filter_list;
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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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.get = multiq_get,
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.put = multiq_put,
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.change = multiq_change,
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.delete = multiq_delete,
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.walk = multiq_walk,
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.tcf_chain = multiq_find_tcf,
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.bind_tcf = multiq_bind,
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.unbind_tcf = multiq_put,
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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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.requeue = multiq_requeue,
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.drop = multiq_drop,
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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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