include/net/pkt_sched.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NET_PKT_SCHED_H
   3 #define __NET_PKT_SCHED_H
   4
   5 #include <linux/jiffies.h>
   6 #include <linux/ktime.h>
   7 #include <linux/if_vlan.h>
   8 #include <linux/netdevice.h>
   9 #include <net/sch_generic.h>
  10 #include <net/net_namespace.h>
  11 #include <uapi/linux/pkt_sched.h>
  12
  13 #define DEFAULT_TX_QUEUE_LEN    1000
  14
  15 struct qdisc_walker {
  16         int     stop;
  17         int     skip;
  18         int     count;
  19         int     (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
  20 };
  21
  22 #define QDISC_ALIGNTO           64
  23 #define QDISC_ALIGN(len)        (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
  24
  25 static inline void *qdisc_priv(struct Qdisc *q)
  26 {
  27         return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
  28 }
  29
  30 /*
  31    Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
  32
  33    Normal IP packet size ~ 512byte, hence:
  34
  35    0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
  36    10Mbit ethernet.
  37
  38    10msec resolution -> <50Kbit/sec.
  39
  40    The result: [34]86 is not good choice for QoS router :-(
  41
  42    The things are not so bad, because we may use artificial
  43    clock evaluated by integration of network data flow
  44    in the most critical places.
  45  */
  46
  47 typedef u64     psched_time_t;
  48 typedef long    psched_tdiff_t;
  49
  50 /* Avoid doing 64 bit divide */
  51 #define PSCHED_SHIFT                    6
  52 #define PSCHED_TICKS2NS(x)              ((s64)(x) << PSCHED_SHIFT)
  53 #define PSCHED_NS2TICKS(x)              ((x) >> PSCHED_SHIFT)
  54
  55 #define PSCHED_TICKS_PER_SEC            PSCHED_NS2TICKS(NSEC_PER_SEC)
  56 #define PSCHED_PASTPERFECT              0
  57
  58 static inline psched_time_t psched_get_time(void)
  59 {
  60         return PSCHED_NS2TICKS(ktime_get_ns());
  61 }
  62
  63 static inline psched_tdiff_t
  64 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
  65 {
  66         return min(tv1 - tv2, bound);
  67 }
  68
  69 struct qdisc_watchdog {
  70         u64             last_expires;
  71         struct hrtimer  timer;
  72         struct Qdisc    *qdisc;
  73 };
  74
  75 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
  76                                  clockid_t clockid);
  77 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
  78
  79 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
  80                                       u64 delta_ns);
  81
  82 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
  83                                               u64 expires)
  84 {
  85         return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
  86 }
  87
  88 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
  89                                            psched_time_t expires)
  90 {
  91         qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
  92 }
  93
  94 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
  95
  96 extern struct Qdisc_ops pfifo_qdisc_ops;
  97 extern struct Qdisc_ops bfifo_qdisc_ops;
  98 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
  99
 100 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 101 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 102                                unsigned int limit,
 103                                struct netlink_ext_ack *extack);
 104
 105 int register_qdisc(struct Qdisc_ops *qops);
 106 int unregister_qdisc(struct Qdisc_ops *qops);
 107 void qdisc_get_default(char *id, size_t len);
 108 int qdisc_set_default(const char *id);
 109
 110 void qdisc_hash_add(struct Qdisc *q, bool invisible);
 111 void qdisc_hash_del(struct Qdisc *q);
 112 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 113 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
 114 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 115                                         struct nlattr *tab,
 116                                         struct netlink_ext_ack *extack);
 117 void qdisc_put_rtab(struct qdisc_rate_table *tab);
 118 void qdisc_put_stab(struct qdisc_size_table *tab);
 119 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
 120 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 121                      struct net_device *dev, struct netdev_queue *txq,
 122                      spinlock_t *root_lock, bool validate);
 123
 124 void __qdisc_run(struct Qdisc *q);
 125
 126 static inline void qdisc_run(struct Qdisc *q)
 127 {
 128         if (qdisc_run_begin(q)) {
 129                 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
 130                  * to avoid racing with dev_qdisc_reset()
 131                  */
 132                 if (!(q->flags & TCQ_F_NOLOCK) ||
 133                     likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
 134                         __qdisc_run(q);
 135                 qdisc_run_end(q);
 136         }
 137 }
 138
 139 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
 140 {
 141         /* We need to take extra care in case the skb came via
 142          * vlan accelerated path. In that case, use skb->vlan_proto
 143          * as the original vlan header was already stripped.
 144          */
 145         if (skb_vlan_tag_present(skb))
 146                 return skb->vlan_proto;
 147         return skb->protocol;
 148 }
 149
 150 /* Calculate maximal size of packet seen by hard_start_xmit
 151    routine of this device.
 152  */
 153 static inline unsigned int psched_mtu(const struct net_device *dev)
 154 {
 155         return dev->mtu + dev->hard_header_len;
 156 }
 157
 158 static inline struct net *qdisc_net(struct Qdisc *q)
 159 {
 160         return dev_net(q->dev_queue->dev);
 161 }
 162
 163 struct tc_cbs_qopt_offload {
 164         u8 enable;
 165         s32 queue;
 166         s32 hicredit;
 167         s32 locredit;
 168         s32 idleslope;
 169         s32 sendslope;
 170 };
 171
 172 struct tc_etf_qopt_offload {
 173         u8 enable;
 174         s32 queue;
 175 };
 176
 177 struct tc_taprio_sched_entry {
 178         u8 command; /* TC_TAPRIO_CMD_* */
 179
 180         /* The gate_mask in the offloading side refers to traffic classes */
 181         u32 gate_mask;
 182         u32 interval;
 183 };
 184
 185 struct tc_taprio_qopt_offload {
 186         u8 enable;
 187         ktime_t base_time;
 188         u64 cycle_time;
 189         u64 cycle_time_extension;
 190
 191         size_t num_entries;
 192         struct tc_taprio_sched_entry entries[];
 193 };
 194
 195 /* Reference counting */
 196 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
 197                                                   *offload);
 198 void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
 199
 200 #endif