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TOMOYO Linux Cross Reference
Linux/include/net/pkt_sched.h

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  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(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
 76 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
 77 
 78 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
 79                                            psched_time_t expires)
 80 {
 81         qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
 82 }
 83 
 84 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
 85 
 86 extern struct Qdisc_ops pfifo_qdisc_ops;
 87 extern struct Qdisc_ops bfifo_qdisc_ops;
 88 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
 89 
 90 int fifo_set_limit(struct Qdisc *q, unsigned int limit);
 91 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 92                                unsigned int limit,
 93                                struct netlink_ext_ack *extack);
 94 
 95 int register_qdisc(struct Qdisc_ops *qops);
 96 int unregister_qdisc(struct Qdisc_ops *qops);
 97 void qdisc_get_default(char *id, size_t len);
 98 int qdisc_set_default(const char *id);
 99 
100 void qdisc_hash_add(struct Qdisc *q, bool invisible);
101 void qdisc_hash_del(struct Qdisc *q);
102 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
103 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
104                                         struct nlattr *tab,
105                                         struct netlink_ext_ack *extack);
106 void qdisc_put_rtab(struct qdisc_rate_table *tab);
107 void qdisc_put_stab(struct qdisc_size_table *tab);
108 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
109 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
110                      struct net_device *dev, struct netdev_queue *txq,
111                      spinlock_t *root_lock, bool validate);
112 
113 void __qdisc_run(struct Qdisc *q);
114 
115 static inline void qdisc_run(struct Qdisc *q)
116 {
117         if (qdisc_run_begin(q)) {
118                 __qdisc_run(q);
119                 qdisc_run_end(q);
120         }
121 }
122 
123 static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
124 {
125         /* We need to take extra care in case the skb came via
126          * vlan accelerated path. In that case, use skb->vlan_proto
127          * as the original vlan header was already stripped.
128          */
129         if (skb_vlan_tag_present(skb))
130                 return skb->vlan_proto;
131         return skb->protocol;
132 }
133 
134 /* Calculate maximal size of packet seen by hard_start_xmit
135    routine of this device.
136  */
137 static inline unsigned int psched_mtu(const struct net_device *dev)
138 {
139         return dev->mtu + dev->hard_header_len;
140 }
141 
142 static inline struct net *qdisc_net(struct Qdisc *q)
143 {
144         return dev_net(q->dev_queue->dev);
145 }
146 
147 struct tc_cbs_qopt_offload {
148         u8 enable;
149         s32 queue;
150         s32 hicredit;
151         s32 locredit;
152         s32 idleslope;
153         s32 sendslope;
154 };
155 
156 #endif
157 

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