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-rw-r--r--include/net/pkt_sched.h309
1 files changed, 309 insertions, 0 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
new file mode 100644
index 0000000000..15960564e0
--- /dev/null
+++ b/include/net/pkt_sched.h
@@ -0,0 +1,309 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_PKT_SCHED_H
+#define __NET_PKT_SCHED_H
+
+#include <linux/jiffies.h>
+#include <linux/ktime.h>
+#include <linux/if_vlan.h>
+#include <linux/netdevice.h>
+#include <net/sch_generic.h>
+#include <net/net_namespace.h>
+#include <uapi/linux/pkt_sched.h>
+
+#define DEFAULT_TX_QUEUE_LEN 1000
+#define STAB_SIZE_LOG_MAX 30
+
+struct qdisc_walker {
+ int stop;
+ int skip;
+ int count;
+ int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
+};
+
+static inline void *qdisc_priv(struct Qdisc *q)
+{
+ return &q->privdata;
+}
+
+static inline struct Qdisc *qdisc_from_priv(void *priv)
+{
+ return container_of(priv, struct Qdisc, privdata);
+}
+
+/*
+ Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
+
+ Normal IP packet size ~ 512byte, hence:
+
+ 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
+ 10Mbit ethernet.
+
+ 10msec resolution -> <50Kbit/sec.
+
+ The result: [34]86 is not good choice for QoS router :-(
+
+ The things are not so bad, because we may use artificial
+ clock evaluated by integration of network data flow
+ in the most critical places.
+ */
+
+typedef u64 psched_time_t;
+typedef long psched_tdiff_t;
+
+/* Avoid doing 64 bit divide */
+#define PSCHED_SHIFT 6
+#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
+#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
+
+#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
+#define PSCHED_PASTPERFECT 0
+
+static inline psched_time_t psched_get_time(void)
+{
+ return PSCHED_NS2TICKS(ktime_get_ns());
+}
+
+struct qdisc_watchdog {
+ struct hrtimer timer;
+ struct Qdisc *qdisc;
+};
+
+void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
+ clockid_t clockid);
+void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
+
+void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
+ u64 delta_ns);
+
+static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
+ u64 expires)
+{
+ return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
+}
+
+static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
+ psched_time_t expires)
+{
+ qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
+}
+
+void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
+
+extern struct Qdisc_ops pfifo_qdisc_ops;
+extern struct Qdisc_ops bfifo_qdisc_ops;
+extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
+
+int fifo_set_limit(struct Qdisc *q, unsigned int limit);
+struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
+ unsigned int limit,
+ struct netlink_ext_ack *extack);
+
+int register_qdisc(struct Qdisc_ops *qops);
+void unregister_qdisc(struct Qdisc_ops *qops);
+void qdisc_get_default(char *id, size_t len);
+int qdisc_set_default(const char *id);
+
+void qdisc_hash_add(struct Qdisc *q, bool invisible);
+void qdisc_hash_del(struct Qdisc *q);
+struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
+struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
+struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
+ struct nlattr *tab,
+ struct netlink_ext_ack *extack);
+void qdisc_put_rtab(struct qdisc_rate_table *tab);
+void qdisc_put_stab(struct qdisc_size_table *tab);
+void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
+bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
+ struct net_device *dev, struct netdev_queue *txq,
+ spinlock_t *root_lock, bool validate);
+
+void __qdisc_run(struct Qdisc *q);
+
+static inline void qdisc_run(struct Qdisc *q)
+{
+ if (qdisc_run_begin(q)) {
+ __qdisc_run(q);
+ qdisc_run_end(q);
+ }
+}
+
+extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
+
+/* Calculate maximal size of packet seen by hard_start_xmit
+ routine of this device.
+ */
+static inline unsigned int psched_mtu(const struct net_device *dev)
+{
+ return READ_ONCE(dev->mtu) + dev->hard_header_len;
+}
+
+static inline struct net *qdisc_net(struct Qdisc *q)
+{
+ return dev_net(q->dev_queue->dev);
+}
+
+struct tc_query_caps_base {
+ enum tc_setup_type type;
+ void *caps;
+};
+
+struct tc_cbs_qopt_offload {
+ u8 enable;
+ s32 queue;
+ s32 hicredit;
+ s32 locredit;
+ s32 idleslope;
+ s32 sendslope;
+};
+
+struct tc_etf_qopt_offload {
+ u8 enable;
+ s32 queue;
+};
+
+struct tc_mqprio_caps {
+ bool validate_queue_counts:1;
+};
+
+struct tc_mqprio_qopt_offload {
+ /* struct tc_mqprio_qopt must always be the first element */
+ struct tc_mqprio_qopt qopt;
+ struct netlink_ext_ack *extack;
+ u16 mode;
+ u16 shaper;
+ u32 flags;
+ u64 min_rate[TC_QOPT_MAX_QUEUE];
+ u64 max_rate[TC_QOPT_MAX_QUEUE];
+ unsigned long preemptible_tcs;
+};
+
+struct tc_taprio_caps {
+ bool supports_queue_max_sdu:1;
+ bool gate_mask_per_txq:1;
+ /* Device expects lower TXQ numbers to have higher priority over higher
+ * TXQs, regardless of their TC mapping. DO NOT USE FOR NEW DRIVERS,
+ * INSTEAD ENFORCE A PROPER TC:TXQ MAPPING COMING FROM USER SPACE.
+ */
+ bool broken_mqprio:1;
+};
+
+enum tc_taprio_qopt_cmd {
+ TAPRIO_CMD_REPLACE,
+ TAPRIO_CMD_DESTROY,
+ TAPRIO_CMD_STATS,
+ TAPRIO_CMD_QUEUE_STATS,
+};
+
+/**
+ * struct tc_taprio_qopt_stats - IEEE 802.1Qbv statistics
+ * @window_drops: Frames that were dropped because they were too large to be
+ * transmitted in any of the allotted time windows (open gates) for their
+ * traffic class.
+ * @tx_overruns: Frames still being transmitted by the MAC after the
+ * transmission gate associated with their traffic class has closed.
+ * Equivalent to `12.29.1.1.2 TransmissionOverrun` from 802.1Q-2018.
+ */
+struct tc_taprio_qopt_stats {
+ u64 window_drops;
+ u64 tx_overruns;
+};
+
+struct tc_taprio_qopt_queue_stats {
+ int queue;
+ struct tc_taprio_qopt_stats stats;
+};
+
+struct tc_taprio_sched_entry {
+ u8 command; /* TC_TAPRIO_CMD_* */
+
+ /* The gate_mask in the offloading side refers to traffic classes */
+ u32 gate_mask;
+ u32 interval;
+};
+
+struct tc_taprio_qopt_offload {
+ enum tc_taprio_qopt_cmd cmd;
+
+ union {
+ /* TAPRIO_CMD_STATS */
+ struct tc_taprio_qopt_stats stats;
+ /* TAPRIO_CMD_QUEUE_STATS */
+ struct tc_taprio_qopt_queue_stats queue_stats;
+ /* TAPRIO_CMD_REPLACE */
+ struct {
+ struct tc_mqprio_qopt_offload mqprio;
+ struct netlink_ext_ack *extack;
+ ktime_t base_time;
+ u64 cycle_time;
+ u64 cycle_time_extension;
+ u32 max_sdu[TC_MAX_QUEUE];
+
+ size_t num_entries;
+ struct tc_taprio_sched_entry entries[];
+ };
+ };
+};
+
+#if IS_ENABLED(CONFIG_NET_SCH_TAPRIO)
+
+/* Reference counting */
+struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
+ *offload);
+void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
+
+#else
+
+/* Reference counting */
+static inline struct tc_taprio_qopt_offload *
+taprio_offload_get(struct tc_taprio_qopt_offload *offload)
+{
+ return NULL;
+}
+
+static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload)
+{
+}
+
+#endif
+
+/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
+ * not mistaken for a software timestamp, because this will otherwise prevent
+ * the dispatch of hardware timestamps to the socket.
+ */
+static inline void skb_txtime_consumed(struct sk_buff *skb)
+{
+ skb->tstamp = ktime_set(0, 0);
+}
+
+struct tc_skb_cb {
+ struct qdisc_skb_cb qdisc_cb;
+
+ u16 mru;
+ u8 post_ct:1;
+ u8 post_ct_snat:1;
+ u8 post_ct_dnat:1;
+ u16 zone; /* Only valid if post_ct = true */
+};
+
+static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
+{
+ struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
+
+ BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
+ return cb;
+}
+
+static inline bool tc_qdisc_stats_dump(struct Qdisc *sch,
+ unsigned long cl,
+ struct qdisc_walker *arg)
+{
+ if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) {
+ arg->stop = 1;
+ return false;
+ }
+
+ arg->count++;
+ return true;
+}
+
+#endif