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_fq_codel.c | 735 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 735 insertions(+) create mode 100644 net/sched/sch_fq_codel.c (limited to 'net/sched/sch_fq_codel.c') diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c new file mode 100644 index 000000000..8c4fee063 --- /dev/null +++ b/net/sched/sch_fq_codel.c @@ -0,0 +1,735 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Fair Queue CoDel discipline + * + * Copyright (C) 2012,2015 Eric Dumazet + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Fair Queue CoDel. + * + * Principles : + * Packets are classified (internal classifier or external) on flows. + * This is a Stochastic model (as we use a hash, several flows + * might be hashed on same slot) + * Each flow has a CoDel managed queue. + * Flows are linked onto two (Round Robin) lists, + * so that new flows have priority on old ones. + * + * For a given flow, packets are not reordered (CoDel uses a FIFO) + * head drops only. + * ECN capability is on by default. + * Low memory footprint (64 bytes per flow) + */ + +struct fq_codel_flow { + struct sk_buff *head; + struct sk_buff *tail; + struct list_head flowchain; + int deficit; + struct codel_vars cvars; +}; /* please try to keep this structure <= 64 bytes */ + +struct fq_codel_sched_data { + struct tcf_proto __rcu *filter_list; /* optional external classifier */ + struct tcf_block *block; + struct fq_codel_flow *flows; /* Flows table [flows_cnt] */ + u32 *backlogs; /* backlog table [flows_cnt] */ + u32 flows_cnt; /* number of flows */ + u32 quantum; /* psched_mtu(qdisc_dev(sch)); */ + u32 drop_batch_size; + u32 memory_limit; + struct codel_params cparams; + struct codel_stats cstats; + u32 memory_usage; + u32 drop_overmemory; + u32 drop_overlimit; + u32 new_flow_count; + + struct list_head new_flows; /* list of new flows */ + struct list_head old_flows; /* list of old flows */ +}; + +static unsigned int fq_codel_hash(const struct fq_codel_sched_data *q, + struct sk_buff *skb) +{ + return reciprocal_scale(skb_get_hash(skb), q->flows_cnt); +} + +static unsigned int fq_codel_classify(struct sk_buff *skb, struct Qdisc *sch, + int *qerr) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct tcf_proto *filter; + struct tcf_result res; + int result; + + if (TC_H_MAJ(skb->priority) == sch->handle && + TC_H_MIN(skb->priority) > 0 && + TC_H_MIN(skb->priority) <= q->flows_cnt) + return TC_H_MIN(skb->priority); + + filter = rcu_dereference_bh(q->filter_list); + if (!filter) + return fq_codel_hash(q, skb) + 1; + + *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; + result = tcf_classify(skb, NULL, filter, &res, false); + if (result >= 0) { +#ifdef CONFIG_NET_CLS_ACT + switch (result) { + case TC_ACT_STOLEN: + case TC_ACT_QUEUED: + case TC_ACT_TRAP: + *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; + fallthrough; + case TC_ACT_SHOT: + return 0; + } +#endif + if (TC_H_MIN(res.classid) <= q->flows_cnt) + return TC_H_MIN(res.classid); + } + return 0; +} + +/* helper functions : might be changed when/if skb use a standard list_head */ + +/* remove one skb from head of slot queue */ +static inline struct sk_buff *dequeue_head(struct fq_codel_flow *flow) +{ + struct sk_buff *skb = flow->head; + + flow->head = skb->next; + skb_mark_not_on_list(skb); + return skb; +} + +/* add skb to flow queue (tail add) */ +static inline void flow_queue_add(struct fq_codel_flow *flow, + struct sk_buff *skb) +{ + if (flow->head == NULL) + flow->head = skb; + else + flow->tail->next = skb; + flow->tail = skb; + skb->next = NULL; +} + +static unsigned int fq_codel_drop(struct Qdisc *sch, unsigned int max_packets, + struct sk_buff **to_free) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct sk_buff *skb; + unsigned int maxbacklog = 0, idx = 0, i, len; + struct fq_codel_flow *flow; + unsigned int threshold; + unsigned int mem = 0; + + /* Queue is full! Find the fat flow and drop packet(s) from it. + * This might sound expensive, but with 1024 flows, we scan + * 4KB of memory, and we dont need to handle a complex tree + * in fast path (packet queue/enqueue) with many cache misses. + * In stress mode, we'll try to drop 64 packets from the flow, + * amortizing this linear lookup to one cache line per drop. + */ + for (i = 0; i < q->flows_cnt; i++) { + if (q->backlogs[i] > maxbacklog) { + maxbacklog = q->backlogs[i]; + idx = i; + } + } + + /* Our goal is to drop half of this fat flow backlog */ + threshold = maxbacklog >> 1; + + flow = &q->flows[idx]; + len = 0; + i = 0; + do { + skb = dequeue_head(flow); + len += qdisc_pkt_len(skb); + mem += get_codel_cb(skb)->mem_usage; + __qdisc_drop(skb, to_free); + } while (++i < max_packets && len < threshold); + + /* Tell codel to increase its signal strength also */ + flow->cvars.count += i; + q->backlogs[idx] -= len; + q->memory_usage -= mem; + sch->qstats.drops += i; + sch->qstats.backlog -= len; + sch->q.qlen -= i; + return idx; +} + +static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch, + struct sk_buff **to_free) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + unsigned int idx, prev_backlog, prev_qlen; + struct fq_codel_flow *flow; + int ret; + unsigned int pkt_len; + bool memory_limited; + + idx = fq_codel_classify(skb, sch, &ret); + if (idx == 0) { + if (ret & __NET_XMIT_BYPASS) + qdisc_qstats_drop(sch); + __qdisc_drop(skb, to_free); + return ret; + } + idx--; + + codel_set_enqueue_time(skb); + flow = &q->flows[idx]; + flow_queue_add(flow, skb); + q->backlogs[idx] += qdisc_pkt_len(skb); + qdisc_qstats_backlog_inc(sch, skb); + + if (list_empty(&flow->flowchain)) { + list_add_tail(&flow->flowchain, &q->new_flows); + q->new_flow_count++; + flow->deficit = q->quantum; + } + get_codel_cb(skb)->mem_usage = skb->truesize; + q->memory_usage += get_codel_cb(skb)->mem_usage; + memory_limited = q->memory_usage > q->memory_limit; + if (++sch->q.qlen <= sch->limit && !memory_limited) + return NET_XMIT_SUCCESS; + + prev_backlog = sch->qstats.backlog; + prev_qlen = sch->q.qlen; + + /* save this packet length as it might be dropped by fq_codel_drop() */ + pkt_len = qdisc_pkt_len(skb); + /* fq_codel_drop() is quite expensive, as it performs a linear search + * in q->backlogs[] to find a fat flow. + * So instead of dropping a single packet, drop half of its backlog + * with a 64 packets limit to not add a too big cpu spike here. + */ + ret = fq_codel_drop(sch, q->drop_batch_size, to_free); + + prev_qlen -= sch->q.qlen; + prev_backlog -= sch->qstats.backlog; + q->drop_overlimit += prev_qlen; + if (memory_limited) + q->drop_overmemory += prev_qlen; + + /* As we dropped packet(s), better let upper stack know this. + * If we dropped a packet for this flow, return NET_XMIT_CN, + * but in this case, our parents wont increase their backlogs. + */ + if (ret == idx) { + qdisc_tree_reduce_backlog(sch, prev_qlen - 1, + prev_backlog - pkt_len); + return NET_XMIT_CN; + } + qdisc_tree_reduce_backlog(sch, prev_qlen, prev_backlog); + return NET_XMIT_SUCCESS; +} + +/* This is the specific function called from codel_dequeue() + * to dequeue a packet from queue. Note: backlog is handled in + * codel, we dont need to reduce it here. + */ +static struct sk_buff *dequeue_func(struct codel_vars *vars, void *ctx) +{ + struct Qdisc *sch = ctx; + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct fq_codel_flow *flow; + struct sk_buff *skb = NULL; + + flow = container_of(vars, struct fq_codel_flow, cvars); + if (flow->head) { + skb = dequeue_head(flow); + q->backlogs[flow - q->flows] -= qdisc_pkt_len(skb); + q->memory_usage -= get_codel_cb(skb)->mem_usage; + sch->q.qlen--; + sch->qstats.backlog -= qdisc_pkt_len(skb); + } + return skb; +} + +static void drop_func(struct sk_buff *skb, void *ctx) +{ + struct Qdisc *sch = ctx; + + kfree_skb(skb); + qdisc_qstats_drop(sch); +} + +static struct sk_buff *fq_codel_dequeue(struct Qdisc *sch) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct sk_buff *skb; + struct fq_codel_flow *flow; + struct list_head *head; + +begin: + head = &q->new_flows; + if (list_empty(head)) { + head = &q->old_flows; + if (list_empty(head)) + return NULL; + } + flow = list_first_entry(head, struct fq_codel_flow, flowchain); + + if (flow->deficit <= 0) { + flow->deficit += q->quantum; + list_move_tail(&flow->flowchain, &q->old_flows); + goto begin; + } + + skb = codel_dequeue(sch, &sch->qstats.backlog, &q->cparams, + &flow->cvars, &q->cstats, qdisc_pkt_len, + codel_get_enqueue_time, drop_func, dequeue_func); + + if (!skb) { + /* force a pass through old_flows to prevent starvation */ + if ((head == &q->new_flows) && !list_empty(&q->old_flows)) + list_move_tail(&flow->flowchain, &q->old_flows); + else + list_del_init(&flow->flowchain); + goto begin; + } + qdisc_bstats_update(sch, skb); + flow->deficit -= qdisc_pkt_len(skb); + /* We cant call qdisc_tree_reduce_backlog() if our qlen is 0, + * or HTB crashes. Defer it for next round. + */ + if (q->cstats.drop_count && sch->q.qlen) { + qdisc_tree_reduce_backlog(sch, q->cstats.drop_count, + q->cstats.drop_len); + q->cstats.drop_count = 0; + q->cstats.drop_len = 0; + } + return skb; +} + +static void fq_codel_flow_purge(struct fq_codel_flow *flow) +{ + rtnl_kfree_skbs(flow->head, flow->tail); + flow->head = NULL; +} + +static void fq_codel_reset(struct Qdisc *sch) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + int i; + + INIT_LIST_HEAD(&q->new_flows); + INIT_LIST_HEAD(&q->old_flows); + for (i = 0; i < q->flows_cnt; i++) { + struct fq_codel_flow *flow = q->flows + i; + + fq_codel_flow_purge(flow); + INIT_LIST_HEAD(&flow->flowchain); + codel_vars_init(&flow->cvars); + } + memset(q->backlogs, 0, q->flows_cnt * sizeof(u32)); + q->memory_usage = 0; +} + +static const struct nla_policy fq_codel_policy[TCA_FQ_CODEL_MAX + 1] = { + [TCA_FQ_CODEL_TARGET] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_LIMIT] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_INTERVAL] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_ECN] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_FLOWS] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_QUANTUM] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_CE_THRESHOLD] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_DROP_BATCH_SIZE] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_MEMORY_LIMIT] = { .type = NLA_U32 }, + [TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR] = { .type = NLA_U8 }, + [TCA_FQ_CODEL_CE_THRESHOLD_MASK] = { .type = NLA_U8 }, +}; + +static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt, + struct netlink_ext_ack *extack) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct nlattr *tb[TCA_FQ_CODEL_MAX + 1]; + u32 quantum = 0; + int err; + + err = nla_parse_nested_deprecated(tb, TCA_FQ_CODEL_MAX, opt, + fq_codel_policy, NULL); + if (err < 0) + return err; + if (tb[TCA_FQ_CODEL_FLOWS]) { + if (q->flows) + return -EINVAL; + q->flows_cnt = nla_get_u32(tb[TCA_FQ_CODEL_FLOWS]); + if (!q->flows_cnt || + q->flows_cnt > 65536) + return -EINVAL; + } + if (tb[TCA_FQ_CODEL_QUANTUM]) { + quantum = max(256U, nla_get_u32(tb[TCA_FQ_CODEL_QUANTUM])); + if (quantum > FQ_CODEL_QUANTUM_MAX) { + NL_SET_ERR_MSG(extack, "Invalid quantum"); + return -EINVAL; + } + } + sch_tree_lock(sch); + + if (tb[TCA_FQ_CODEL_TARGET]) { + u64 target = nla_get_u32(tb[TCA_FQ_CODEL_TARGET]); + + q->cparams.target = (target * NSEC_PER_USEC) >> CODEL_SHIFT; + } + + if (tb[TCA_FQ_CODEL_CE_THRESHOLD]) { + u64 val = nla_get_u32(tb[TCA_FQ_CODEL_CE_THRESHOLD]); + + q->cparams.ce_threshold = (val * NSEC_PER_USEC) >> CODEL_SHIFT; + } + + if (tb[TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR]) + q->cparams.ce_threshold_selector = nla_get_u8(tb[TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR]); + if (tb[TCA_FQ_CODEL_CE_THRESHOLD_MASK]) + q->cparams.ce_threshold_mask = nla_get_u8(tb[TCA_FQ_CODEL_CE_THRESHOLD_MASK]); + + if (tb[TCA_FQ_CODEL_INTERVAL]) { + u64 interval = nla_get_u32(tb[TCA_FQ_CODEL_INTERVAL]); + + q->cparams.interval = (interval * NSEC_PER_USEC) >> CODEL_SHIFT; + } + + if (tb[TCA_FQ_CODEL_LIMIT]) + sch->limit = nla_get_u32(tb[TCA_FQ_CODEL_LIMIT]); + + if (tb[TCA_FQ_CODEL_ECN]) + q->cparams.ecn = !!nla_get_u32(tb[TCA_FQ_CODEL_ECN]); + + if (quantum) + q->quantum = quantum; + + if (tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]) + q->drop_batch_size = max(1U, nla_get_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE])); + + if (tb[TCA_FQ_CODEL_MEMORY_LIMIT]) + q->memory_limit = min(1U << 31, nla_get_u32(tb[TCA_FQ_CODEL_MEMORY_LIMIT])); + + while (sch->q.qlen > sch->limit || + q->memory_usage > q->memory_limit) { + struct sk_buff *skb = fq_codel_dequeue(sch); + + q->cstats.drop_len += qdisc_pkt_len(skb); + rtnl_kfree_skbs(skb, skb); + q->cstats.drop_count++; + } + qdisc_tree_reduce_backlog(sch, q->cstats.drop_count, q->cstats.drop_len); + q->cstats.drop_count = 0; + q->cstats.drop_len = 0; + + sch_tree_unlock(sch); + return 0; +} + +static void fq_codel_destroy(struct Qdisc *sch) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + + tcf_block_put(q->block); + kvfree(q->backlogs); + kvfree(q->flows); +} + +static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt, + struct netlink_ext_ack *extack) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + int i; + int err; + + sch->limit = 10*1024; + q->flows_cnt = 1024; + q->memory_limit = 32 << 20; /* 32 MBytes */ + q->drop_batch_size = 64; + q->quantum = psched_mtu(qdisc_dev(sch)); + INIT_LIST_HEAD(&q->new_flows); + INIT_LIST_HEAD(&q->old_flows); + codel_params_init(&q->cparams); + codel_stats_init(&q->cstats); + q->cparams.ecn = true; + q->cparams.mtu = psched_mtu(qdisc_dev(sch)); + + if (opt) { + err = fq_codel_change(sch, opt, extack); + if (err) + goto init_failure; + } + + err = tcf_block_get(&q->block, &q->filter_list, sch, extack); + if (err) + goto init_failure; + + if (!q->flows) { + q->flows = kvcalloc(q->flows_cnt, + sizeof(struct fq_codel_flow), + GFP_KERNEL); + if (!q->flows) { + err = -ENOMEM; + goto init_failure; + } + q->backlogs = kvcalloc(q->flows_cnt, sizeof(u32), GFP_KERNEL); + if (!q->backlogs) { + err = -ENOMEM; + goto alloc_failure; + } + for (i = 0; i < q->flows_cnt; i++) { + struct fq_codel_flow *flow = q->flows + i; + + INIT_LIST_HEAD(&flow->flowchain); + codel_vars_init(&flow->cvars); + } + } + if (sch->limit >= 1) + sch->flags |= TCQ_F_CAN_BYPASS; + else + sch->flags &= ~TCQ_F_CAN_BYPASS; + return 0; + +alloc_failure: + kvfree(q->flows); + q->flows = NULL; +init_failure: + q->flows_cnt = 0; + return err; +} + +static int fq_codel_dump(struct Qdisc *sch, struct sk_buff *skb) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct nlattr *opts; + + opts = nla_nest_start_noflag(skb, TCA_OPTIONS); + if (opts == NULL) + goto nla_put_failure; + + if (nla_put_u32(skb, TCA_FQ_CODEL_TARGET, + codel_time_to_us(q->cparams.target)) || + nla_put_u32(skb, TCA_FQ_CODEL_LIMIT, + sch->limit) || + nla_put_u32(skb, TCA_FQ_CODEL_INTERVAL, + codel_time_to_us(q->cparams.interval)) || + nla_put_u32(skb, TCA_FQ_CODEL_ECN, + q->cparams.ecn) || + nla_put_u32(skb, TCA_FQ_CODEL_QUANTUM, + q->quantum) || + nla_put_u32(skb, TCA_FQ_CODEL_DROP_BATCH_SIZE, + q->drop_batch_size) || + nla_put_u32(skb, TCA_FQ_CODEL_MEMORY_LIMIT, + q->memory_limit) || + nla_put_u32(skb, TCA_FQ_CODEL_FLOWS, + q->flows_cnt)) + goto nla_put_failure; + + if (q->cparams.ce_threshold != CODEL_DISABLED_THRESHOLD) { + if (nla_put_u32(skb, TCA_FQ_CODEL_CE_THRESHOLD, + codel_time_to_us(q->cparams.ce_threshold))) + goto nla_put_failure; + if (nla_put_u8(skb, TCA_FQ_CODEL_CE_THRESHOLD_SELECTOR, q->cparams.ce_threshold_selector)) + goto nla_put_failure; + if (nla_put_u8(skb, TCA_FQ_CODEL_CE_THRESHOLD_MASK, q->cparams.ce_threshold_mask)) + goto nla_put_failure; + } + + return nla_nest_end(skb, opts); + +nla_put_failure: + return -1; +} + +static int fq_codel_dump_stats(struct Qdisc *sch, struct gnet_dump *d) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + struct tc_fq_codel_xstats st = { + .type = TCA_FQ_CODEL_XSTATS_QDISC, + }; + struct list_head *pos; + + st.qdisc_stats.maxpacket = q->cstats.maxpacket; + st.qdisc_stats.drop_overlimit = q->drop_overlimit; + st.qdisc_stats.ecn_mark = q->cstats.ecn_mark; + st.qdisc_stats.new_flow_count = q->new_flow_count; + st.qdisc_stats.ce_mark = q->cstats.ce_mark; + st.qdisc_stats.memory_usage = q->memory_usage; + st.qdisc_stats.drop_overmemory = q->drop_overmemory; + + sch_tree_lock(sch); + list_for_each(pos, &q->new_flows) + st.qdisc_stats.new_flows_len++; + + list_for_each(pos, &q->old_flows) + st.qdisc_stats.old_flows_len++; + sch_tree_unlock(sch); + + return gnet_stats_copy_app(d, &st, sizeof(st)); +} + +static struct Qdisc *fq_codel_leaf(struct Qdisc *sch, unsigned long arg) +{ + return NULL; +} + +static unsigned long fq_codel_find(struct Qdisc *sch, u32 classid) +{ + return 0; +} + +static unsigned long fq_codel_bind(struct Qdisc *sch, unsigned long parent, + u32 classid) +{ + return 0; +} + +static void fq_codel_unbind(struct Qdisc *q, unsigned long cl) +{ +} + +static struct tcf_block *fq_codel_tcf_block(struct Qdisc *sch, unsigned long cl, + struct netlink_ext_ack *extack) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + + if (cl) + return NULL; + return q->block; +} + +static int fq_codel_dump_class(struct Qdisc *sch, unsigned long cl, + struct sk_buff *skb, struct tcmsg *tcm) +{ + tcm->tcm_handle |= TC_H_MIN(cl); + return 0; +} + +static int fq_codel_dump_class_stats(struct Qdisc *sch, unsigned long cl, + struct gnet_dump *d) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + u32 idx = cl - 1; + struct gnet_stats_queue qs = { 0 }; + struct tc_fq_codel_xstats xstats; + + if (idx < q->flows_cnt) { + const struct fq_codel_flow *flow = &q->flows[idx]; + const struct sk_buff *skb; + + memset(&xstats, 0, sizeof(xstats)); + xstats.type = TCA_FQ_CODEL_XSTATS_CLASS; + xstats.class_stats.deficit = flow->deficit; + xstats.class_stats.ldelay = + codel_time_to_us(flow->cvars.ldelay); + xstats.class_stats.count = flow->cvars.count; + xstats.class_stats.lastcount = flow->cvars.lastcount; + xstats.class_stats.dropping = flow->cvars.dropping; + if (flow->cvars.dropping) { + codel_tdiff_t delta = flow->cvars.drop_next - + codel_get_time(); + + xstats.class_stats.drop_next = (delta >= 0) ? + codel_time_to_us(delta) : + -codel_time_to_us(-delta); + } + if (flow->head) { + sch_tree_lock(sch); + skb = flow->head; + while (skb) { + qs.qlen++; + skb = skb->next; + } + sch_tree_unlock(sch); + } + qs.backlog = q->backlogs[idx]; + qs.drops = 0; + } + if (gnet_stats_copy_queue(d, NULL, &qs, qs.qlen) < 0) + return -1; + if (idx < q->flows_cnt) + return gnet_stats_copy_app(d, &xstats, sizeof(xstats)); + return 0; +} + +static void fq_codel_walk(struct Qdisc *sch, struct qdisc_walker *arg) +{ + struct fq_codel_sched_data *q = qdisc_priv(sch); + unsigned int i; + + if (arg->stop) + return; + + for (i = 0; i < q->flows_cnt; i++) { + if (list_empty(&q->flows[i].flowchain)) { + arg->count++; + continue; + } + if (!tc_qdisc_stats_dump(sch, i + 1, arg)) + break; + } +} + +static const struct Qdisc_class_ops fq_codel_class_ops = { + .leaf = fq_codel_leaf, + .find = fq_codel_find, + .tcf_block = fq_codel_tcf_block, + .bind_tcf = fq_codel_bind, + .unbind_tcf = fq_codel_unbind, + .dump = fq_codel_dump_class, + .dump_stats = fq_codel_dump_class_stats, + .walk = fq_codel_walk, +}; + +static struct Qdisc_ops fq_codel_qdisc_ops __read_mostly = { + .cl_ops = &fq_codel_class_ops, + .id = "fq_codel", + .priv_size = sizeof(struct fq_codel_sched_data), + .enqueue = fq_codel_enqueue, + .dequeue = fq_codel_dequeue, + .peek = qdisc_peek_dequeued, + .init = fq_codel_init, + .reset = fq_codel_reset, + .destroy = fq_codel_destroy, + .change = fq_codel_change, + .dump = fq_codel_dump, + .dump_stats = fq_codel_dump_stats, + .owner = THIS_MODULE, +}; + +static int __init fq_codel_module_init(void) +{ + return register_qdisc(&fq_codel_qdisc_ops); +} + +static void __exit fq_codel_module_exit(void) +{ + unregister_qdisc(&fq_codel_qdisc_ops); +} + +module_init(fq_codel_module_init) +module_exit(fq_codel_module_exit) +MODULE_AUTHOR("Eric Dumazet"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Fair Queue CoDel discipline"); -- cgit v1.2.3