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835 lines
20 KiB
835 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* net/sched/sch_ets.c Enhanced Transmission Selection scheduler |
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* |
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* Description |
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* ----------- |
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* |
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* The Enhanced Transmission Selection scheduler is a classful queuing |
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* discipline that merges functionality of PRIO and DRR qdiscs in one scheduler. |
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* ETS makes it easy to configure a set of strict and bandwidth-sharing bands to |
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* implement the transmission selection described in 802.1Qaz. |
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* |
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* Although ETS is technically classful, it's not possible to add and remove |
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* classes at will. Instead one specifies number of classes, how many are |
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* PRIO-like and how many DRR-like, and quanta for the latter. |
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* |
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* Algorithm |
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* --------- |
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* |
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* The strict classes, if any, are tried for traffic first: first band 0, if it |
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* has no traffic then band 1, etc. |
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* |
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* When there is no traffic in any of the strict queues, the bandwidth-sharing |
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* ones are tried next. Each band is assigned a deficit counter, initialized to |
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* "quantum" of that band. ETS maintains a list of active bandwidth-sharing |
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* bands whose qdiscs are non-empty. A packet is dequeued from the band at the |
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* head of the list if the packet size is smaller or equal to the deficit |
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* counter. If the counter is too small, it is increased by "quantum" and the |
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* scheduler moves on to the next band in the active list. |
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*/ |
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|
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#include <linux/module.h> |
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#include <net/gen_stats.h> |
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#include <net/netlink.h> |
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#include <net/pkt_cls.h> |
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#include <net/pkt_sched.h> |
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#include <net/sch_generic.h> |
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|
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struct ets_class { |
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struct list_head alist; /* In struct ets_sched.active. */ |
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struct Qdisc *qdisc; |
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u32 quantum; |
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u32 deficit; |
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struct gnet_stats_basic_packed bstats; |
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struct gnet_stats_queue qstats; |
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}; |
|
|
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struct ets_sched { |
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struct list_head active; |
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struct tcf_proto __rcu *filter_list; |
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struct tcf_block *block; |
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unsigned int nbands; |
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unsigned int nstrict; |
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u8 prio2band[TC_PRIO_MAX + 1]; |
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struct ets_class classes[TCQ_ETS_MAX_BANDS]; |
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}; |
|
|
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static const struct nla_policy ets_policy[TCA_ETS_MAX + 1] = { |
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[TCA_ETS_NBANDS] = { .type = NLA_U8 }, |
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[TCA_ETS_NSTRICT] = { .type = NLA_U8 }, |
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[TCA_ETS_QUANTA] = { .type = NLA_NESTED }, |
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[TCA_ETS_PRIOMAP] = { .type = NLA_NESTED }, |
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}; |
|
|
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static const struct nla_policy ets_priomap_policy[TCA_ETS_MAX + 1] = { |
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[TCA_ETS_PRIOMAP_BAND] = { .type = NLA_U8 }, |
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}; |
|
|
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static const struct nla_policy ets_quanta_policy[TCA_ETS_MAX + 1] = { |
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[TCA_ETS_QUANTA_BAND] = { .type = NLA_U32 }, |
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}; |
|
|
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static const struct nla_policy ets_class_policy[TCA_ETS_MAX + 1] = { |
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[TCA_ETS_QUANTA_BAND] = { .type = NLA_U32 }, |
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}; |
|
|
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static int ets_quantum_parse(struct Qdisc *sch, const struct nlattr *attr, |
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unsigned int *quantum, |
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struct netlink_ext_ack *extack) |
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{ |
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*quantum = nla_get_u32(attr); |
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if (!*quantum) { |
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NL_SET_ERR_MSG(extack, "ETS quantum cannot be zero"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
|
|
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static struct ets_class * |
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ets_class_from_arg(struct Qdisc *sch, unsigned long arg) |
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{ |
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struct ets_sched *q = qdisc_priv(sch); |
|
|
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return &q->classes[arg - 1]; |
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} |
|
|
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static u32 ets_class_id(struct Qdisc *sch, const struct ets_class *cl) |
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{ |
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struct ets_sched *q = qdisc_priv(sch); |
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int band = cl - q->classes; |
|
|
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return TC_H_MAKE(sch->handle, band + 1); |
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} |
|
|
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static void ets_offload_change(struct Qdisc *sch) |
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{ |
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struct net_device *dev = qdisc_dev(sch); |
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struct ets_sched *q = qdisc_priv(sch); |
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struct tc_ets_qopt_offload qopt; |
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unsigned int w_psum_prev = 0; |
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unsigned int q_psum = 0; |
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unsigned int q_sum = 0; |
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unsigned int quantum; |
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unsigned int w_psum; |
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unsigned int weight; |
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unsigned int i; |
|
|
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if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) |
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return; |
|
|
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qopt.command = TC_ETS_REPLACE; |
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qopt.handle = sch->handle; |
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qopt.parent = sch->parent; |
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qopt.replace_params.bands = q->nbands; |
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qopt.replace_params.qstats = &sch->qstats; |
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memcpy(&qopt.replace_params.priomap, |
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q->prio2band, sizeof(q->prio2band)); |
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|
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for (i = 0; i < q->nbands; i++) |
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q_sum += q->classes[i].quantum; |
|
|
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for (i = 0; i < q->nbands; i++) { |
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quantum = q->classes[i].quantum; |
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q_psum += quantum; |
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w_psum = quantum ? q_psum * 100 / q_sum : 0; |
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weight = w_psum - w_psum_prev; |
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w_psum_prev = w_psum; |
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|
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qopt.replace_params.quanta[i] = quantum; |
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qopt.replace_params.weights[i] = weight; |
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} |
|
|
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dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt); |
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} |
|
|
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static void ets_offload_destroy(struct Qdisc *sch) |
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{ |
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struct net_device *dev = qdisc_dev(sch); |
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struct tc_ets_qopt_offload qopt; |
|
|
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if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) |
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return; |
|
|
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qopt.command = TC_ETS_DESTROY; |
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qopt.handle = sch->handle; |
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qopt.parent = sch->parent; |
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dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_ETS, &qopt); |
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} |
|
|
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static void ets_offload_graft(struct Qdisc *sch, struct Qdisc *new, |
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struct Qdisc *old, unsigned long arg, |
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struct netlink_ext_ack *extack) |
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{ |
|
struct net_device *dev = qdisc_dev(sch); |
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struct tc_ets_qopt_offload qopt; |
|
|
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qopt.command = TC_ETS_GRAFT; |
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qopt.handle = sch->handle; |
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qopt.parent = sch->parent; |
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qopt.graft_params.band = arg - 1; |
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qopt.graft_params.child_handle = new->handle; |
|
|
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qdisc_offload_graft_helper(dev, sch, new, old, TC_SETUP_QDISC_ETS, |
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&qopt, extack); |
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} |
|
|
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static int ets_offload_dump(struct Qdisc *sch) |
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{ |
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struct tc_ets_qopt_offload qopt; |
|
|
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qopt.command = TC_ETS_STATS; |
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qopt.handle = sch->handle; |
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qopt.parent = sch->parent; |
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qopt.stats.bstats = &sch->bstats; |
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qopt.stats.qstats = &sch->qstats; |
|
|
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return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_ETS, &qopt); |
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} |
|
|
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static bool ets_class_is_strict(struct ets_sched *q, const struct ets_class *cl) |
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{ |
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unsigned int band = cl - q->classes; |
|
|
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return band < q->nstrict; |
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} |
|
|
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static int ets_class_change(struct Qdisc *sch, u32 classid, u32 parentid, |
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struct nlattr **tca, unsigned long *arg, |
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struct netlink_ext_ack *extack) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, *arg); |
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struct ets_sched *q = qdisc_priv(sch); |
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struct nlattr *opt = tca[TCA_OPTIONS]; |
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struct nlattr *tb[TCA_ETS_MAX + 1]; |
|
unsigned int quantum; |
|
int err; |
|
|
|
/* Classes can be added and removed only through Qdisc_ops.change |
|
* interface. |
|
*/ |
|
if (!cl) { |
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NL_SET_ERR_MSG(extack, "Fine-grained class addition and removal is not supported"); |
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return -EOPNOTSUPP; |
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} |
|
|
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if (!opt) { |
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NL_SET_ERR_MSG(extack, "ETS options are required for this operation"); |
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return -EINVAL; |
|
} |
|
|
|
err = nla_parse_nested(tb, TCA_ETS_MAX, opt, ets_class_policy, extack); |
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if (err < 0) |
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return err; |
|
|
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if (!tb[TCA_ETS_QUANTA_BAND]) |
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/* Nothing to configure. */ |
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return 0; |
|
|
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if (ets_class_is_strict(q, cl)) { |
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NL_SET_ERR_MSG(extack, "Strict bands do not have a configurable quantum"); |
|
return -EINVAL; |
|
} |
|
|
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err = ets_quantum_parse(sch, tb[TCA_ETS_QUANTA_BAND], &quantum, |
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extack); |
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if (err) |
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return err; |
|
|
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sch_tree_lock(sch); |
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cl->quantum = quantum; |
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sch_tree_unlock(sch); |
|
|
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ets_offload_change(sch); |
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return 0; |
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} |
|
|
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static int ets_class_graft(struct Qdisc *sch, unsigned long arg, |
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struct Qdisc *new, struct Qdisc **old, |
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struct netlink_ext_ack *extack) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, arg); |
|
|
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if (!new) { |
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new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
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ets_class_id(sch, cl), NULL); |
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if (!new) |
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new = &noop_qdisc; |
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else |
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qdisc_hash_add(new, true); |
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} |
|
|
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*old = qdisc_replace(sch, new, &cl->qdisc); |
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ets_offload_graft(sch, new, *old, arg, extack); |
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return 0; |
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} |
|
|
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static struct Qdisc *ets_class_leaf(struct Qdisc *sch, unsigned long arg) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, arg); |
|
|
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return cl->qdisc; |
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} |
|
|
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static unsigned long ets_class_find(struct Qdisc *sch, u32 classid) |
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{ |
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unsigned long band = TC_H_MIN(classid); |
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struct ets_sched *q = qdisc_priv(sch); |
|
|
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if (band - 1 >= q->nbands) |
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return 0; |
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return band; |
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} |
|
|
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static void ets_class_qlen_notify(struct Qdisc *sch, unsigned long arg) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, arg); |
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struct ets_sched *q = qdisc_priv(sch); |
|
|
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/* We get notified about zero-length child Qdiscs as well if they are |
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* offloaded. Those aren't on the active list though, so don't attempt |
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* to remove them. |
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*/ |
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if (!ets_class_is_strict(q, cl) && sch->q.qlen) |
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list_del(&cl->alist); |
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} |
|
|
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static int ets_class_dump(struct Qdisc *sch, unsigned long arg, |
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struct sk_buff *skb, struct tcmsg *tcm) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, arg); |
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struct ets_sched *q = qdisc_priv(sch); |
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struct nlattr *nest; |
|
|
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tcm->tcm_parent = TC_H_ROOT; |
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tcm->tcm_handle = ets_class_id(sch, cl); |
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tcm->tcm_info = cl->qdisc->handle; |
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|
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nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
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if (!nest) |
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goto nla_put_failure; |
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if (!ets_class_is_strict(q, cl)) { |
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if (nla_put_u32(skb, TCA_ETS_QUANTA_BAND, cl->quantum)) |
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goto nla_put_failure; |
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} |
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return nla_nest_end(skb, nest); |
|
|
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nla_put_failure: |
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nla_nest_cancel(skb, nest); |
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return -EMSGSIZE; |
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} |
|
|
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static int ets_class_dump_stats(struct Qdisc *sch, unsigned long arg, |
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struct gnet_dump *d) |
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{ |
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struct ets_class *cl = ets_class_from_arg(sch, arg); |
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struct Qdisc *cl_q = cl->qdisc; |
|
|
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if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
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d, NULL, &cl_q->bstats) < 0 || |
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qdisc_qstats_copy(d, cl_q) < 0) |
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return -1; |
|
|
|
return 0; |
|
} |
|
|
|
static void ets_qdisc_walk(struct Qdisc *sch, struct qdisc_walker *arg) |
|
{ |
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struct ets_sched *q = qdisc_priv(sch); |
|
int i; |
|
|
|
if (arg->stop) |
|
return; |
|
|
|
for (i = 0; i < q->nbands; i++) { |
|
if (arg->count < arg->skip) { |
|
arg->count++; |
|
continue; |
|
} |
|
if (arg->fn(sch, i + 1, arg) < 0) { |
|
arg->stop = 1; |
|
break; |
|
} |
|
arg->count++; |
|
} |
|
} |
|
|
|
static struct tcf_block * |
|
ets_qdisc_tcf_block(struct Qdisc *sch, unsigned long cl, |
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struct netlink_ext_ack *extack) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
|
|
if (cl) { |
|
NL_SET_ERR_MSG(extack, "ETS classid must be zero"); |
|
return NULL; |
|
} |
|
|
|
return q->block; |
|
} |
|
|
|
static unsigned long ets_qdisc_bind_tcf(struct Qdisc *sch, unsigned long parent, |
|
u32 classid) |
|
{ |
|
return ets_class_find(sch, classid); |
|
} |
|
|
|
static void ets_qdisc_unbind_tcf(struct Qdisc *sch, unsigned long arg) |
|
{ |
|
} |
|
|
|
static struct ets_class *ets_classify(struct sk_buff *skb, struct Qdisc *sch, |
|
int *qerr) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
u32 band = skb->priority; |
|
struct tcf_result res; |
|
struct tcf_proto *fl; |
|
int err; |
|
|
|
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
|
if (TC_H_MAJ(skb->priority) != sch->handle) { |
|
fl = rcu_dereference_bh(q->filter_list); |
|
err = tcf_classify(skb, NULL, fl, &res, false); |
|
#ifdef CONFIG_NET_CLS_ACT |
|
switch (err) { |
|
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 NULL; |
|
} |
|
#endif |
|
if (!fl || err < 0) { |
|
if (TC_H_MAJ(band)) |
|
band = 0; |
|
return &q->classes[q->prio2band[band & TC_PRIO_MAX]]; |
|
} |
|
band = res.classid; |
|
} |
|
band = TC_H_MIN(band) - 1; |
|
if (band >= q->nbands) |
|
return &q->classes[q->prio2band[0]]; |
|
return &q->classes[band]; |
|
} |
|
|
|
static int ets_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
|
struct sk_buff **to_free) |
|
{ |
|
unsigned int len = qdisc_pkt_len(skb); |
|
struct ets_sched *q = qdisc_priv(sch); |
|
struct ets_class *cl; |
|
int err = 0; |
|
bool first; |
|
|
|
cl = ets_classify(skb, sch, &err); |
|
if (!cl) { |
|
if (err & __NET_XMIT_BYPASS) |
|
qdisc_qstats_drop(sch); |
|
__qdisc_drop(skb, to_free); |
|
return err; |
|
} |
|
|
|
first = !cl->qdisc->q.qlen; |
|
err = qdisc_enqueue(skb, cl->qdisc, to_free); |
|
if (unlikely(err != NET_XMIT_SUCCESS)) { |
|
if (net_xmit_drop_count(err)) { |
|
cl->qstats.drops++; |
|
qdisc_qstats_drop(sch); |
|
} |
|
return err; |
|
} |
|
|
|
if (first && !ets_class_is_strict(q, cl)) { |
|
list_add_tail(&cl->alist, &q->active); |
|
cl->deficit = cl->quantum; |
|
} |
|
|
|
sch->qstats.backlog += len; |
|
sch->q.qlen++; |
|
return err; |
|
} |
|
|
|
static struct sk_buff * |
|
ets_qdisc_dequeue_skb(struct Qdisc *sch, struct sk_buff *skb) |
|
{ |
|
qdisc_bstats_update(sch, skb); |
|
qdisc_qstats_backlog_dec(sch, skb); |
|
sch->q.qlen--; |
|
return skb; |
|
} |
|
|
|
static struct sk_buff *ets_qdisc_dequeue(struct Qdisc *sch) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
struct ets_class *cl; |
|
struct sk_buff *skb; |
|
unsigned int band; |
|
unsigned int len; |
|
|
|
while (1) { |
|
for (band = 0; band < q->nstrict; band++) { |
|
cl = &q->classes[band]; |
|
skb = qdisc_dequeue_peeked(cl->qdisc); |
|
if (skb) |
|
return ets_qdisc_dequeue_skb(sch, skb); |
|
} |
|
|
|
if (list_empty(&q->active)) |
|
goto out; |
|
|
|
cl = list_first_entry(&q->active, struct ets_class, alist); |
|
skb = cl->qdisc->ops->peek(cl->qdisc); |
|
if (!skb) { |
|
qdisc_warn_nonwc(__func__, cl->qdisc); |
|
goto out; |
|
} |
|
|
|
len = qdisc_pkt_len(skb); |
|
if (len <= cl->deficit) { |
|
cl->deficit -= len; |
|
skb = qdisc_dequeue_peeked(cl->qdisc); |
|
if (unlikely(!skb)) |
|
goto out; |
|
if (cl->qdisc->q.qlen == 0) |
|
list_del(&cl->alist); |
|
return ets_qdisc_dequeue_skb(sch, skb); |
|
} |
|
|
|
cl->deficit += cl->quantum; |
|
list_move_tail(&cl->alist, &q->active); |
|
} |
|
out: |
|
return NULL; |
|
} |
|
|
|
static int ets_qdisc_priomap_parse(struct nlattr *priomap_attr, |
|
unsigned int nbands, u8 *priomap, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
const struct nlattr *attr; |
|
int prio = 0; |
|
u8 band; |
|
int rem; |
|
int err; |
|
|
|
err = __nla_validate_nested(priomap_attr, TCA_ETS_MAX, |
|
ets_priomap_policy, NL_VALIDATE_STRICT, |
|
extack); |
|
if (err) |
|
return err; |
|
|
|
nla_for_each_nested(attr, priomap_attr, rem) { |
|
switch (nla_type(attr)) { |
|
case TCA_ETS_PRIOMAP_BAND: |
|
if (prio > TC_PRIO_MAX) { |
|
NL_SET_ERR_MSG_MOD(extack, "Too many priorities in ETS priomap"); |
|
return -EINVAL; |
|
} |
|
band = nla_get_u8(attr); |
|
if (band >= nbands) { |
|
NL_SET_ERR_MSG_MOD(extack, "Invalid band number in ETS priomap"); |
|
return -EINVAL; |
|
} |
|
priomap[prio++] = band; |
|
break; |
|
default: |
|
WARN_ON_ONCE(1); /* Validate should have caught this. */ |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ets_qdisc_quanta_parse(struct Qdisc *sch, struct nlattr *quanta_attr, |
|
unsigned int nbands, unsigned int nstrict, |
|
unsigned int *quanta, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
const struct nlattr *attr; |
|
int band = nstrict; |
|
int rem; |
|
int err; |
|
|
|
err = __nla_validate_nested(quanta_attr, TCA_ETS_MAX, |
|
ets_quanta_policy, NL_VALIDATE_STRICT, |
|
extack); |
|
if (err < 0) |
|
return err; |
|
|
|
nla_for_each_nested(attr, quanta_attr, rem) { |
|
switch (nla_type(attr)) { |
|
case TCA_ETS_QUANTA_BAND: |
|
if (band >= nbands) { |
|
NL_SET_ERR_MSG_MOD(extack, "ETS quanta has more values than bands"); |
|
return -EINVAL; |
|
} |
|
err = ets_quantum_parse(sch, attr, &quanta[band++], |
|
extack); |
|
if (err) |
|
return err; |
|
break; |
|
default: |
|
WARN_ON_ONCE(1); /* Validate should have caught this. */ |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
unsigned int quanta[TCQ_ETS_MAX_BANDS] = {0}; |
|
struct Qdisc *queues[TCQ_ETS_MAX_BANDS]; |
|
struct ets_sched *q = qdisc_priv(sch); |
|
struct nlattr *tb[TCA_ETS_MAX + 1]; |
|
unsigned int oldbands = q->nbands; |
|
u8 priomap[TC_PRIO_MAX + 1]; |
|
unsigned int nstrict = 0; |
|
unsigned int nbands; |
|
unsigned int i; |
|
int err; |
|
|
|
if (!opt) { |
|
NL_SET_ERR_MSG(extack, "ETS options are required for this operation"); |
|
return -EINVAL; |
|
} |
|
|
|
err = nla_parse_nested(tb, TCA_ETS_MAX, opt, ets_policy, extack); |
|
if (err < 0) |
|
return err; |
|
|
|
if (!tb[TCA_ETS_NBANDS]) { |
|
NL_SET_ERR_MSG_MOD(extack, "Number of bands is a required argument"); |
|
return -EINVAL; |
|
} |
|
nbands = nla_get_u8(tb[TCA_ETS_NBANDS]); |
|
if (nbands < 1 || nbands > TCQ_ETS_MAX_BANDS) { |
|
NL_SET_ERR_MSG_MOD(extack, "Invalid number of bands"); |
|
return -EINVAL; |
|
} |
|
/* Unless overridden, traffic goes to the last band. */ |
|
memset(priomap, nbands - 1, sizeof(priomap)); |
|
|
|
if (tb[TCA_ETS_NSTRICT]) { |
|
nstrict = nla_get_u8(tb[TCA_ETS_NSTRICT]); |
|
if (nstrict > nbands) { |
|
NL_SET_ERR_MSG_MOD(extack, "Invalid number of strict bands"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
if (tb[TCA_ETS_PRIOMAP]) { |
|
err = ets_qdisc_priomap_parse(tb[TCA_ETS_PRIOMAP], |
|
nbands, priomap, extack); |
|
if (err) |
|
return err; |
|
} |
|
|
|
if (tb[TCA_ETS_QUANTA]) { |
|
err = ets_qdisc_quanta_parse(sch, tb[TCA_ETS_QUANTA], |
|
nbands, nstrict, quanta, extack); |
|
if (err) |
|
return err; |
|
} |
|
/* If there are more bands than strict + quanta provided, the remaining |
|
* ones are ETS with quantum of MTU. Initialize the missing values here. |
|
*/ |
|
for (i = nstrict; i < nbands; i++) { |
|
if (!quanta[i]) |
|
quanta[i] = psched_mtu(qdisc_dev(sch)); |
|
} |
|
|
|
/* Before commit, make sure we can allocate all new qdiscs */ |
|
for (i = oldbands; i < nbands; i++) { |
|
queues[i] = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, |
|
ets_class_id(sch, &q->classes[i]), |
|
extack); |
|
if (!queues[i]) { |
|
while (i > oldbands) |
|
qdisc_put(queues[--i]); |
|
return -ENOMEM; |
|
} |
|
} |
|
|
|
sch_tree_lock(sch); |
|
|
|
q->nbands = nbands; |
|
for (i = nstrict; i < q->nstrict; i++) { |
|
INIT_LIST_HEAD(&q->classes[i].alist); |
|
if (q->classes[i].qdisc->q.qlen) { |
|
list_add_tail(&q->classes[i].alist, &q->active); |
|
q->classes[i].deficit = quanta[i]; |
|
} |
|
} |
|
q->nstrict = nstrict; |
|
memcpy(q->prio2band, priomap, sizeof(priomap)); |
|
|
|
for (i = q->nbands; i < oldbands; i++) |
|
qdisc_tree_flush_backlog(q->classes[i].qdisc); |
|
|
|
for (i = 0; i < q->nbands; i++) |
|
q->classes[i].quantum = quanta[i]; |
|
|
|
for (i = oldbands; i < q->nbands; i++) { |
|
q->classes[i].qdisc = queues[i]; |
|
if (q->classes[i].qdisc != &noop_qdisc) |
|
qdisc_hash_add(q->classes[i].qdisc, true); |
|
} |
|
|
|
sch_tree_unlock(sch); |
|
|
|
ets_offload_change(sch); |
|
for (i = q->nbands; i < oldbands; i++) { |
|
qdisc_put(q->classes[i].qdisc); |
|
memset(&q->classes[i], 0, sizeof(q->classes[i])); |
|
} |
|
return 0; |
|
} |
|
|
|
static int ets_qdisc_init(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
int err; |
|
|
|
if (!opt) |
|
return -EINVAL; |
|
|
|
err = tcf_block_get(&q->block, &q->filter_list, sch, extack); |
|
if (err) |
|
return err; |
|
|
|
INIT_LIST_HEAD(&q->active); |
|
return ets_qdisc_change(sch, opt, extack); |
|
} |
|
|
|
static void ets_qdisc_reset(struct Qdisc *sch) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
int band; |
|
|
|
for (band = q->nstrict; band < q->nbands; band++) { |
|
if (q->classes[band].qdisc->q.qlen) |
|
list_del(&q->classes[band].alist); |
|
} |
|
for (band = 0; band < q->nbands; band++) |
|
qdisc_reset(q->classes[band].qdisc); |
|
sch->qstats.backlog = 0; |
|
sch->q.qlen = 0; |
|
} |
|
|
|
static void ets_qdisc_destroy(struct Qdisc *sch) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
int band; |
|
|
|
ets_offload_destroy(sch); |
|
tcf_block_put(q->block); |
|
for (band = 0; band < q->nbands; band++) |
|
qdisc_put(q->classes[band].qdisc); |
|
} |
|
|
|
static int ets_qdisc_dump(struct Qdisc *sch, struct sk_buff *skb) |
|
{ |
|
struct ets_sched *q = qdisc_priv(sch); |
|
struct nlattr *opts; |
|
struct nlattr *nest; |
|
int band; |
|
int prio; |
|
int err; |
|
|
|
err = ets_offload_dump(sch); |
|
if (err) |
|
return err; |
|
|
|
opts = nla_nest_start_noflag(skb, TCA_OPTIONS); |
|
if (!opts) |
|
goto nla_err; |
|
|
|
if (nla_put_u8(skb, TCA_ETS_NBANDS, q->nbands)) |
|
goto nla_err; |
|
|
|
if (q->nstrict && |
|
nla_put_u8(skb, TCA_ETS_NSTRICT, q->nstrict)) |
|
goto nla_err; |
|
|
|
if (q->nbands > q->nstrict) { |
|
nest = nla_nest_start(skb, TCA_ETS_QUANTA); |
|
if (!nest) |
|
goto nla_err; |
|
|
|
for (band = q->nstrict; band < q->nbands; band++) { |
|
if (nla_put_u32(skb, TCA_ETS_QUANTA_BAND, |
|
q->classes[band].quantum)) |
|
goto nla_err; |
|
} |
|
|
|
nla_nest_end(skb, nest); |
|
} |
|
|
|
nest = nla_nest_start(skb, TCA_ETS_PRIOMAP); |
|
if (!nest) |
|
goto nla_err; |
|
|
|
for (prio = 0; prio <= TC_PRIO_MAX; prio++) { |
|
if (nla_put_u8(skb, TCA_ETS_PRIOMAP_BAND, q->prio2band[prio])) |
|
goto nla_err; |
|
} |
|
|
|
nla_nest_end(skb, nest); |
|
|
|
return nla_nest_end(skb, opts); |
|
|
|
nla_err: |
|
nla_nest_cancel(skb, opts); |
|
return -EMSGSIZE; |
|
} |
|
|
|
static const struct Qdisc_class_ops ets_class_ops = { |
|
.change = ets_class_change, |
|
.graft = ets_class_graft, |
|
.leaf = ets_class_leaf, |
|
.find = ets_class_find, |
|
.qlen_notify = ets_class_qlen_notify, |
|
.dump = ets_class_dump, |
|
.dump_stats = ets_class_dump_stats, |
|
.walk = ets_qdisc_walk, |
|
.tcf_block = ets_qdisc_tcf_block, |
|
.bind_tcf = ets_qdisc_bind_tcf, |
|
.unbind_tcf = ets_qdisc_unbind_tcf, |
|
}; |
|
|
|
static struct Qdisc_ops ets_qdisc_ops __read_mostly = { |
|
.cl_ops = &ets_class_ops, |
|
.id = "ets", |
|
.priv_size = sizeof(struct ets_sched), |
|
.enqueue = ets_qdisc_enqueue, |
|
.dequeue = ets_qdisc_dequeue, |
|
.peek = qdisc_peek_dequeued, |
|
.change = ets_qdisc_change, |
|
.init = ets_qdisc_init, |
|
.reset = ets_qdisc_reset, |
|
.destroy = ets_qdisc_destroy, |
|
.dump = ets_qdisc_dump, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static int __init ets_init(void) |
|
{ |
|
return register_qdisc(&ets_qdisc_ops); |
|
} |
|
|
|
static void __exit ets_exit(void) |
|
{ |
|
unregister_qdisc(&ets_qdisc_ops); |
|
} |
|
|
|
module_init(ets_init); |
|
module_exit(ets_exit); |
|
MODULE_LICENSE("GPL");
|
|
|