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 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
  79
  80 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
  81                                            psched_time_t expires)
  82 {
  83         qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
  84 }
  85
  86 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
  87
  88 extern struct Qdisc_ops pfifo_qdisc_ops;
  89 extern struct Qdisc_ops bfifo_qdisc_ops;
  90 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
  91
  92 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
  93 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
  94                                unsigned int limit,
  95                                struct netlink_ext_ack *extack);
  96
  97 int register_qdisc(struct Qdisc_ops *qops);
  98 int unregister_qdisc(struct Qdisc_ops *qops);
  99 void qdisc_get_default(char *id, size_t len);
 100 int qdisc_set_default(const char *id);
 101
 102 void qdisc_hash_add(struct Qdisc *q, bool invisible);
 103 void qdisc_hash_del(struct Qdisc *q);
 104 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
 105 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 106                                         struct nlattr *tab,
 107                                         struct netlink_ext_ack *extack);
 108 void qdisc_put_rtab(struct qdisc_rate_table *tab);
 109 void qdisc_put_stab(struct qdisc_size_table *tab);
 110 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
 111 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 112                      struct net_device *dev, struct netdev_queue *txq,
 113                      spinlock_t *root_lock, bool validate);
 114
 115 void __qdisc_run(struct Qdisc *q);
 116
 117 static inline void qdisc_run(struct Qdisc *q)
 118 {
 119         if (qdisc_run_begin(q)) {
 120                 __qdisc_run(q);
 121                 qdisc_run_end(q);
 122         }
 123 }
 124
 125 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
 126 {
 127         /* We need to take extra care in case the skb came via
 128          * vlan accelerated path. In that case, use skb->vlan_proto
 129          * as the original vlan header was already stripped.
 130          */
 131         if (skb_vlan_tag_present(skb))
 132                 return skb->vlan_proto;
 133         return skb->protocol;
 134 }
 135
 136 /* Calculate maximal size of packet seen by hard_start_xmit
 137    routine of this device.
 138  */
 139 static inline unsigned int psched_mtu(const struct net_device *dev)
 140 {
 141         return dev->mtu + dev->hard_header_len;
 142 }
 143
 144 static inline struct net *qdisc_net(struct Qdisc *q)
 145 {
 146         return dev_net(q->dev_queue->dev);
 147 }
 148
 149 struct tc_cbs_qopt_offload {
 150         u8 enable;
 151         s32 queue;
 152         s32 hicredit;
 153         s32 locredit;
 154         s32 idleslope;
 155         s32 sendslope;
 156 };
 157
 158 struct tc_etf_qopt_offload {
 159         u8 enable;
 160         s32 queue;
 161 };
 162
 163 #endif