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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * net/sched/sch_gred.c Generic Random Early Detection queue.
- *
- * Authors: J Hadi Salim ([email protected]) 1998-2002
- *
- * 991129: - Bug fix with grio mode
- * - a better sing. AvgQ mode with Grio(WRED)
- * - A finer grained VQ dequeue based on suggestion
- * from Ren Liu
- * - More error checks
- *
- * For all the glorious comments look at include/net/red.h
- */
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/skbuff.h>
- #include <net/pkt_cls.h>
- #include <net/pkt_sched.h>
- #include <net/red.h>
- #define GRED_DEF_PRIO (MAX_DPs / 2)
- #define GRED_VQ_MASK (MAX_DPs - 1)
- #define GRED_VQ_RED_FLAGS (TC_RED_ECN | TC_RED_HARDDROP)
- struct gred_sched_data;
- struct gred_sched;
- struct gred_sched_data {
- u32 limit; /* HARD maximal queue length */
- u32 DP; /* the drop parameters */
- u32 red_flags; /* virtualQ version of red_flags */
- u64 bytesin; /* bytes seen on virtualQ so far*/
- u32 packetsin; /* packets seen on virtualQ so far*/
- u32 backlog; /* bytes on the virtualQ */
- u8 prio; /* the prio of this vq */
- struct red_parms parms;
- struct red_vars vars;
- struct red_stats stats;
- };
- enum {
- GRED_WRED_MODE = 1,
- GRED_RIO_MODE,
- };
- struct gred_sched {
- struct gred_sched_data *tab[MAX_DPs];
- unsigned long flags;
- u32 red_flags;
- u32 DPs;
- u32 def;
- struct red_vars wred_set;
- struct tc_gred_qopt_offload *opt;
- };
- static inline int gred_wred_mode(struct gred_sched *table)
- {
- return test_bit(GRED_WRED_MODE, &table->flags);
- }
- static inline void gred_enable_wred_mode(struct gred_sched *table)
- {
- __set_bit(GRED_WRED_MODE, &table->flags);
- }
- static inline void gred_disable_wred_mode(struct gred_sched *table)
- {
- __clear_bit(GRED_WRED_MODE, &table->flags);
- }
- static inline int gred_rio_mode(struct gred_sched *table)
- {
- return test_bit(GRED_RIO_MODE, &table->flags);
- }
- static inline void gred_enable_rio_mode(struct gred_sched *table)
- {
- __set_bit(GRED_RIO_MODE, &table->flags);
- }
- static inline void gred_disable_rio_mode(struct gred_sched *table)
- {
- __clear_bit(GRED_RIO_MODE, &table->flags);
- }
- static inline int gred_wred_mode_check(struct Qdisc *sch)
- {
- struct gred_sched *table = qdisc_priv(sch);
- int i;
- /* Really ugly O(n^2) but shouldn't be necessary too frequent. */
- for (i = 0; i < table->DPs; i++) {
- struct gred_sched_data *q = table->tab[i];
- int n;
- if (q == NULL)
- continue;
- for (n = i + 1; n < table->DPs; n++)
- if (table->tab[n] && table->tab[n]->prio == q->prio)
- return 1;
- }
- return 0;
- }
- static inline unsigned int gred_backlog(struct gred_sched *table,
- struct gred_sched_data *q,
- struct Qdisc *sch)
- {
- if (gred_wred_mode(table))
- return sch->qstats.backlog;
- else
- return q->backlog;
- }
- static inline u16 tc_index_to_dp(struct sk_buff *skb)
- {
- return skb->tc_index & GRED_VQ_MASK;
- }
- static inline void gred_load_wred_set(const struct gred_sched *table,
- struct gred_sched_data *q)
- {
- q->vars.qavg = table->wred_set.qavg;
- q->vars.qidlestart = table->wred_set.qidlestart;
- }
- static inline void gred_store_wred_set(struct gred_sched *table,
- struct gred_sched_data *q)
- {
- table->wred_set.qavg = q->vars.qavg;
- table->wred_set.qidlestart = q->vars.qidlestart;
- }
- static int gred_use_ecn(struct gred_sched_data *q)
- {
- return q->red_flags & TC_RED_ECN;
- }
- static int gred_use_harddrop(struct gred_sched_data *q)
- {
- return q->red_flags & TC_RED_HARDDROP;
- }
- static bool gred_per_vq_red_flags_used(struct gred_sched *table)
- {
- unsigned int i;
- /* Local per-vq flags couldn't have been set unless global are 0 */
- if (table->red_flags)
- return false;
- for (i = 0; i < MAX_DPs; i++)
- if (table->tab[i] && table->tab[i]->red_flags)
- return true;
- return false;
- }
- static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch,
- struct sk_buff **to_free)
- {
- struct gred_sched_data *q = NULL;
- struct gred_sched *t = qdisc_priv(sch);
- unsigned long qavg = 0;
- u16 dp = tc_index_to_dp(skb);
- if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
- dp = t->def;
- q = t->tab[dp];
- if (!q) {
- /* Pass through packets not assigned to a DP
- * if no default DP has been configured. This
- * allows for DP flows to be left untouched.
- */
- if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <=
- sch->limit))
- return qdisc_enqueue_tail(skb, sch);
- else
- goto drop;
- }
- /* fix tc_index? --could be controversial but needed for
- requeueing */
- skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp;
- }
- /* sum up all the qaves of prios < ours to get the new qave */
- if (!gred_wred_mode(t) && gred_rio_mode(t)) {
- int i;
- for (i = 0; i < t->DPs; i++) {
- if (t->tab[i] && t->tab[i]->prio < q->prio &&
- !red_is_idling(&t->tab[i]->vars))
- qavg += t->tab[i]->vars.qavg;
- }
- }
- q->packetsin++;
- q->bytesin += qdisc_pkt_len(skb);
- if (gred_wred_mode(t))
- gred_load_wred_set(t, q);
- q->vars.qavg = red_calc_qavg(&q->parms,
- &q->vars,
- gred_backlog(t, q, sch));
- if (red_is_idling(&q->vars))
- red_end_of_idle_period(&q->vars);
- if (gred_wred_mode(t))
- gred_store_wred_set(t, q);
- switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) {
- case RED_DONT_MARK:
- break;
- case RED_PROB_MARK:
- qdisc_qstats_overlimit(sch);
- if (!gred_use_ecn(q) || !INET_ECN_set_ce(skb)) {
- q->stats.prob_drop++;
- goto congestion_drop;
- }
- q->stats.prob_mark++;
- break;
- case RED_HARD_MARK:
- qdisc_qstats_overlimit(sch);
- if (gred_use_harddrop(q) || !gred_use_ecn(q) ||
- !INET_ECN_set_ce(skb)) {
- q->stats.forced_drop++;
- goto congestion_drop;
- }
- q->stats.forced_mark++;
- break;
- }
- if (gred_backlog(t, q, sch) + qdisc_pkt_len(skb) <= q->limit) {
- q->backlog += qdisc_pkt_len(skb);
- return qdisc_enqueue_tail(skb, sch);
- }
- q->stats.pdrop++;
- drop:
- return qdisc_drop(skb, sch, to_free);
- congestion_drop:
- qdisc_drop(skb, sch, to_free);
- return NET_XMIT_CN;
- }
- static struct sk_buff *gred_dequeue(struct Qdisc *sch)
- {
- struct sk_buff *skb;
- struct gred_sched *t = qdisc_priv(sch);
- skb = qdisc_dequeue_head(sch);
- if (skb) {
- struct gred_sched_data *q;
- u16 dp = tc_index_to_dp(skb);
- if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
- net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n",
- tc_index_to_dp(skb));
- } else {
- q->backlog -= qdisc_pkt_len(skb);
- if (gred_wred_mode(t)) {
- if (!sch->qstats.backlog)
- red_start_of_idle_period(&t->wred_set);
- } else {
- if (!q->backlog)
- red_start_of_idle_period(&q->vars);
- }
- }
- return skb;
- }
- return NULL;
- }
- static void gred_reset(struct Qdisc *sch)
- {
- int i;
- struct gred_sched *t = qdisc_priv(sch);
- qdisc_reset_queue(sch);
- for (i = 0; i < t->DPs; i++) {
- struct gred_sched_data *q = t->tab[i];
- if (!q)
- continue;
- red_restart(&q->vars);
- q->backlog = 0;
- }
- }
- static void gred_offload(struct Qdisc *sch, enum tc_gred_command command)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct net_device *dev = qdisc_dev(sch);
- struct tc_gred_qopt_offload *opt = table->opt;
- if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
- return;
- memset(opt, 0, sizeof(*opt));
- opt->command = command;
- opt->handle = sch->handle;
- opt->parent = sch->parent;
- if (command == TC_GRED_REPLACE) {
- unsigned int i;
- opt->set.grio_on = gred_rio_mode(table);
- opt->set.wred_on = gred_wred_mode(table);
- opt->set.dp_cnt = table->DPs;
- opt->set.dp_def = table->def;
- for (i = 0; i < table->DPs; i++) {
- struct gred_sched_data *q = table->tab[i];
- if (!q)
- continue;
- opt->set.tab[i].present = true;
- opt->set.tab[i].limit = q->limit;
- opt->set.tab[i].prio = q->prio;
- opt->set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
- opt->set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
- opt->set.tab[i].is_ecn = gred_use_ecn(q);
- opt->set.tab[i].is_harddrop = gred_use_harddrop(q);
- opt->set.tab[i].probability = q->parms.max_P;
- opt->set.tab[i].backlog = &q->backlog;
- }
- opt->set.qstats = &sch->qstats;
- }
- dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, opt);
- }
- static int gred_offload_dump_stats(struct Qdisc *sch)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct tc_gred_qopt_offload *hw_stats;
- u64 bytes = 0, packets = 0;
- unsigned int i;
- int ret;
- hw_stats = kzalloc(sizeof(*hw_stats), GFP_KERNEL);
- if (!hw_stats)
- return -ENOMEM;
- hw_stats->command = TC_GRED_STATS;
- hw_stats->handle = sch->handle;
- hw_stats->parent = sch->parent;
- for (i = 0; i < MAX_DPs; i++) {
- gnet_stats_basic_sync_init(&hw_stats->stats.bstats[i]);
- if (table->tab[i])
- hw_stats->stats.xstats[i] = &table->tab[i]->stats;
- }
- ret = qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_GRED, hw_stats);
- /* Even if driver returns failure adjust the stats - in case offload
- * ended but driver still wants to adjust the values.
- */
- sch_tree_lock(sch);
- for (i = 0; i < MAX_DPs; i++) {
- if (!table->tab[i])
- continue;
- table->tab[i]->packetsin += u64_stats_read(&hw_stats->stats.bstats[i].packets);
- table->tab[i]->bytesin += u64_stats_read(&hw_stats->stats.bstats[i].bytes);
- table->tab[i]->backlog += hw_stats->stats.qstats[i].backlog;
- bytes += u64_stats_read(&hw_stats->stats.bstats[i].bytes);
- packets += u64_stats_read(&hw_stats->stats.bstats[i].packets);
- sch->qstats.qlen += hw_stats->stats.qstats[i].qlen;
- sch->qstats.backlog += hw_stats->stats.qstats[i].backlog;
- sch->qstats.drops += hw_stats->stats.qstats[i].drops;
- sch->qstats.requeues += hw_stats->stats.qstats[i].requeues;
- sch->qstats.overlimits += hw_stats->stats.qstats[i].overlimits;
- }
- _bstats_update(&sch->bstats, bytes, packets);
- sch_tree_unlock(sch);
- kfree(hw_stats);
- return ret;
- }
- static inline void gred_destroy_vq(struct gred_sched_data *q)
- {
- kfree(q);
- }
- static int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps,
- struct netlink_ext_ack *extack)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct tc_gred_sopt *sopt;
- bool red_flags_changed;
- int i;
- if (!dps)
- return -EINVAL;
- sopt = nla_data(dps);
- if (sopt->DPs > MAX_DPs) {
- NL_SET_ERR_MSG_MOD(extack, "number of virtual queues too high");
- return -EINVAL;
- }
- if (sopt->DPs == 0) {
- NL_SET_ERR_MSG_MOD(extack,
- "number of virtual queues can't be 0");
- return -EINVAL;
- }
- if (sopt->def_DP >= sopt->DPs) {
- NL_SET_ERR_MSG_MOD(extack, "default virtual queue above virtual queue count");
- return -EINVAL;
- }
- if (sopt->flags && gred_per_vq_red_flags_used(table)) {
- NL_SET_ERR_MSG_MOD(extack, "can't set per-Qdisc RED flags when per-virtual queue flags are used");
- return -EINVAL;
- }
- sch_tree_lock(sch);
- table->DPs = sopt->DPs;
- table->def = sopt->def_DP;
- red_flags_changed = table->red_flags != sopt->flags;
- table->red_flags = sopt->flags;
- /*
- * Every entry point to GRED is synchronized with the above code
- * and the DP is checked against DPs, i.e. shadowed VQs can no
- * longer be found so we can unlock right here.
- */
- sch_tree_unlock(sch);
- if (sopt->grio) {
- gred_enable_rio_mode(table);
- gred_disable_wred_mode(table);
- if (gred_wred_mode_check(sch))
- gred_enable_wred_mode(table);
- } else {
- gred_disable_rio_mode(table);
- gred_disable_wred_mode(table);
- }
- if (red_flags_changed)
- for (i = 0; i < table->DPs; i++)
- if (table->tab[i])
- table->tab[i]->red_flags =
- table->red_flags & GRED_VQ_RED_FLAGS;
- for (i = table->DPs; i < MAX_DPs; i++) {
- if (table->tab[i]) {
- pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n",
- i);
- gred_destroy_vq(table->tab[i]);
- table->tab[i] = NULL;
- }
- }
- gred_offload(sch, TC_GRED_REPLACE);
- return 0;
- }
- static inline int gred_change_vq(struct Qdisc *sch, int dp,
- struct tc_gred_qopt *ctl, int prio,
- u8 *stab, u32 max_P,
- struct gred_sched_data **prealloc,
- struct netlink_ext_ack *extack)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct gred_sched_data *q = table->tab[dp];
- if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log, stab)) {
- NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters");
- return -EINVAL;
- }
- if (!q) {
- table->tab[dp] = q = *prealloc;
- *prealloc = NULL;
- if (!q)
- return -ENOMEM;
- q->red_flags = table->red_flags & GRED_VQ_RED_FLAGS;
- }
- q->DP = dp;
- q->prio = prio;
- if (ctl->limit > sch->limit)
- q->limit = sch->limit;
- else
- q->limit = ctl->limit;
- if (q->backlog == 0)
- red_end_of_idle_period(&q->vars);
- red_set_parms(&q->parms,
- ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
- ctl->Scell_log, stab, max_P);
- red_set_vars(&q->vars);
- return 0;
- }
- static const struct nla_policy gred_vq_policy[TCA_GRED_VQ_MAX + 1] = {
- [TCA_GRED_VQ_DP] = { .type = NLA_U32 },
- [TCA_GRED_VQ_FLAGS] = { .type = NLA_U32 },
- };
- static const struct nla_policy gred_vqe_policy[TCA_GRED_VQ_ENTRY_MAX + 1] = {
- [TCA_GRED_VQ_ENTRY] = { .type = NLA_NESTED },
- };
- static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = {
- [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) },
- [TCA_GRED_STAB] = { .len = 256 },
- [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) },
- [TCA_GRED_MAX_P] = { .type = NLA_U32 },
- [TCA_GRED_LIMIT] = { .type = NLA_U32 },
- [TCA_GRED_VQ_LIST] = { .type = NLA_NESTED },
- };
- static void gred_vq_apply(struct gred_sched *table, const struct nlattr *entry)
- {
- struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
- u32 dp;
- nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry,
- gred_vq_policy, NULL);
- dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
- if (tb[TCA_GRED_VQ_FLAGS])
- table->tab[dp]->red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
- }
- static void gred_vqs_apply(struct gred_sched *table, struct nlattr *vqs)
- {
- const struct nlattr *attr;
- int rem;
- nla_for_each_nested(attr, vqs, rem) {
- switch (nla_type(attr)) {
- case TCA_GRED_VQ_ENTRY:
- gred_vq_apply(table, attr);
- break;
- }
- }
- }
- static int gred_vq_validate(struct gred_sched *table, u32 cdp,
- const struct nlattr *entry,
- struct netlink_ext_ack *extack)
- {
- struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
- int err;
- u32 dp;
- err = nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry,
- gred_vq_policy, extack);
- if (err < 0)
- return err;
- if (!tb[TCA_GRED_VQ_DP]) {
- NL_SET_ERR_MSG_MOD(extack, "Virtual queue with no index specified");
- return -EINVAL;
- }
- dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
- if (dp >= table->DPs) {
- NL_SET_ERR_MSG_MOD(extack, "Virtual queue with index out of bounds");
- return -EINVAL;
- }
- if (dp != cdp && !table->tab[dp]) {
- NL_SET_ERR_MSG_MOD(extack, "Virtual queue not yet instantiated");
- return -EINVAL;
- }
- if (tb[TCA_GRED_VQ_FLAGS]) {
- u32 red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
- if (table->red_flags && table->red_flags != red_flags) {
- NL_SET_ERR_MSG_MOD(extack, "can't change per-virtual queue RED flags when per-Qdisc flags are used");
- return -EINVAL;
- }
- if (red_flags & ~GRED_VQ_RED_FLAGS) {
- NL_SET_ERR_MSG_MOD(extack,
- "invalid RED flags specified");
- return -EINVAL;
- }
- }
- return 0;
- }
- static int gred_vqs_validate(struct gred_sched *table, u32 cdp,
- struct nlattr *vqs, struct netlink_ext_ack *extack)
- {
- const struct nlattr *attr;
- int rem, err;
- err = nla_validate_nested_deprecated(vqs, TCA_GRED_VQ_ENTRY_MAX,
- gred_vqe_policy, extack);
- if (err < 0)
- return err;
- nla_for_each_nested(attr, vqs, rem) {
- switch (nla_type(attr)) {
- case TCA_GRED_VQ_ENTRY:
- err = gred_vq_validate(table, cdp, attr, extack);
- if (err)
- return err;
- break;
- default:
- NL_SET_ERR_MSG_MOD(extack, "GRED_VQ_LIST can contain only entry attributes");
- return -EINVAL;
- }
- }
- if (rem > 0) {
- NL_SET_ERR_MSG_MOD(extack, "Trailing data after parsing virtual queue list");
- return -EINVAL;
- }
- return 0;
- }
- static int gred_change(struct Qdisc *sch, struct nlattr *opt,
- struct netlink_ext_ack *extack)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct tc_gred_qopt *ctl;
- struct nlattr *tb[TCA_GRED_MAX + 1];
- int err, prio = GRED_DEF_PRIO;
- u8 *stab;
- u32 max_P;
- struct gred_sched_data *prealloc;
- err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy,
- extack);
- if (err < 0)
- return err;
- if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) {
- if (tb[TCA_GRED_LIMIT] != NULL)
- sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
- return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
- }
- if (tb[TCA_GRED_PARMS] == NULL ||
- tb[TCA_GRED_STAB] == NULL ||
- tb[TCA_GRED_LIMIT] != NULL) {
- NL_SET_ERR_MSG_MOD(extack, "can't configure Qdisc and virtual queue at the same time");
- return -EINVAL;
- }
- max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0;
- ctl = nla_data(tb[TCA_GRED_PARMS]);
- stab = nla_data(tb[TCA_GRED_STAB]);
- if (ctl->DP >= table->DPs) {
- NL_SET_ERR_MSG_MOD(extack, "virtual queue index above virtual queue count");
- return -EINVAL;
- }
- if (tb[TCA_GRED_VQ_LIST]) {
- err = gred_vqs_validate(table, ctl->DP, tb[TCA_GRED_VQ_LIST],
- extack);
- if (err)
- return err;
- }
- if (gred_rio_mode(table)) {
- if (ctl->prio == 0) {
- int def_prio = GRED_DEF_PRIO;
- if (table->tab[table->def])
- def_prio = table->tab[table->def]->prio;
- printk(KERN_DEBUG "GRED: DP %u does not have a prio "
- "setting default to %d\n", ctl->DP, def_prio);
- prio = def_prio;
- } else
- prio = ctl->prio;
- }
- prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
- sch_tree_lock(sch);
- err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc,
- extack);
- if (err < 0)
- goto err_unlock_free;
- if (tb[TCA_GRED_VQ_LIST])
- gred_vqs_apply(table, tb[TCA_GRED_VQ_LIST]);
- if (gred_rio_mode(table)) {
- gred_disable_wred_mode(table);
- if (gred_wred_mode_check(sch))
- gred_enable_wred_mode(table);
- }
- sch_tree_unlock(sch);
- kfree(prealloc);
- gred_offload(sch, TC_GRED_REPLACE);
- return 0;
- err_unlock_free:
- sch_tree_unlock(sch);
- kfree(prealloc);
- return err;
- }
- static int gred_init(struct Qdisc *sch, struct nlattr *opt,
- struct netlink_ext_ack *extack)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct nlattr *tb[TCA_GRED_MAX + 1];
- int err;
- if (!opt)
- return -EINVAL;
- err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy,
- extack);
- if (err < 0)
- return err;
- if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) {
- NL_SET_ERR_MSG_MOD(extack,
- "virtual queue configuration can't be specified at initialization time");
- return -EINVAL;
- }
- if (tb[TCA_GRED_LIMIT])
- sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
- else
- sch->limit = qdisc_dev(sch)->tx_queue_len
- * psched_mtu(qdisc_dev(sch));
- if (qdisc_dev(sch)->netdev_ops->ndo_setup_tc) {
- table->opt = kzalloc(sizeof(*table->opt), GFP_KERNEL);
- if (!table->opt)
- return -ENOMEM;
- }
- return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
- }
- static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
- {
- struct gred_sched *table = qdisc_priv(sch);
- struct nlattr *parms, *vqs, *opts = NULL;
- int i;
- u32 max_p[MAX_DPs];
- struct tc_gred_sopt sopt = {
- .DPs = table->DPs,
- .def_DP = table->def,
- .grio = gred_rio_mode(table),
- .flags = table->red_flags,
- };
- if (gred_offload_dump_stats(sch))
- goto nla_put_failure;
- opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
- if (opts == NULL)
- goto nla_put_failure;
- if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt))
- goto nla_put_failure;
- for (i = 0; i < MAX_DPs; i++) {
- struct gred_sched_data *q = table->tab[i];
- max_p[i] = q ? q->parms.max_P : 0;
- }
- if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_LIMIT, sch->limit))
- goto nla_put_failure;
- /* Old style all-in-one dump of VQs */
- parms = nla_nest_start_noflag(skb, TCA_GRED_PARMS);
- if (parms == NULL)
- goto nla_put_failure;
- for (i = 0; i < MAX_DPs; i++) {
- struct gred_sched_data *q = table->tab[i];
- struct tc_gred_qopt opt;
- unsigned long qavg;
- memset(&opt, 0, sizeof(opt));
- if (!q) {
- /* hack -- fix at some point with proper message
- This is how we indicate to tc that there is no VQ
- at this DP */
- opt.DP = MAX_DPs + i;
- goto append_opt;
- }
- opt.limit = q->limit;
- opt.DP = q->DP;
- opt.backlog = gred_backlog(table, q, sch);
- opt.prio = q->prio;
- opt.qth_min = q->parms.qth_min >> q->parms.Wlog;
- opt.qth_max = q->parms.qth_max >> q->parms.Wlog;
- opt.Wlog = q->parms.Wlog;
- opt.Plog = q->parms.Plog;
- opt.Scell_log = q->parms.Scell_log;
- opt.early = q->stats.prob_drop;
- opt.forced = q->stats.forced_drop;
- opt.pdrop = q->stats.pdrop;
- opt.packets = q->packetsin;
- opt.bytesin = q->bytesin;
- if (gred_wred_mode(table))
- gred_load_wred_set(table, q);
- qavg = red_calc_qavg(&q->parms, &q->vars,
- q->vars.qavg >> q->parms.Wlog);
- opt.qave = qavg >> q->parms.Wlog;
- append_opt:
- if (nla_append(skb, sizeof(opt), &opt) < 0)
- goto nla_put_failure;
- }
- nla_nest_end(skb, parms);
- /* Dump the VQs again, in more structured way */
- vqs = nla_nest_start_noflag(skb, TCA_GRED_VQ_LIST);
- if (!vqs)
- goto nla_put_failure;
- for (i = 0; i < MAX_DPs; i++) {
- struct gred_sched_data *q = table->tab[i];
- struct nlattr *vq;
- if (!q)
- continue;
- vq = nla_nest_start_noflag(skb, TCA_GRED_VQ_ENTRY);
- if (!vq)
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_DP, q->DP))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_FLAGS, q->red_flags))
- goto nla_put_failure;
- /* Stats */
- if (nla_put_u64_64bit(skb, TCA_GRED_VQ_STAT_BYTES, q->bytesin,
- TCA_GRED_VQ_PAD))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PACKETS, q->packetsin))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_BACKLOG,
- gred_backlog(table, q, sch)))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_DROP,
- q->stats.prob_drop))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_MARK,
- q->stats.prob_mark))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_DROP,
- q->stats.forced_drop))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_MARK,
- q->stats.forced_mark))
- goto nla_put_failure;
- if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PDROP, q->stats.pdrop))
- goto nla_put_failure;
- nla_nest_end(skb, vq);
- }
- nla_nest_end(skb, vqs);
- return nla_nest_end(skb, opts);
- nla_put_failure:
- nla_nest_cancel(skb, opts);
- return -EMSGSIZE;
- }
- static void gred_destroy(struct Qdisc *sch)
- {
- struct gred_sched *table = qdisc_priv(sch);
- int i;
- for (i = 0; i < table->DPs; i++)
- gred_destroy_vq(table->tab[i]);
- gred_offload(sch, TC_GRED_DESTROY);
- kfree(table->opt);
- }
- static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
- .id = "gred",
- .priv_size = sizeof(struct gred_sched),
- .enqueue = gred_enqueue,
- .dequeue = gred_dequeue,
- .peek = qdisc_peek_head,
- .init = gred_init,
- .reset = gred_reset,
- .destroy = gred_destroy,
- .change = gred_change,
- .dump = gred_dump,
- .owner = THIS_MODULE,
- };
- static int __init gred_module_init(void)
- {
- return register_qdisc(&gred_qdisc_ops);
- }
- static void __exit gred_module_exit(void)
- {
- unregister_qdisc(&gred_qdisc_ops);
- }
- module_init(gred_module_init)
- module_exit(gred_module_exit)
- MODULE_LICENSE("GPL");
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