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 *qdisc_lookup_class(struct net_device *dev, u32 handle); 104 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 105 struct nlattr *tab, 106 struct netlink_ext_ack *extack); 107 void qdisc_put_rtab(struct qdisc_rate_table *tab); 108 void qdisc_put_stab(struct qdisc_size_table *tab); 109 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 110 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 111 struct net_device *dev, struct netdev_queue *txq, 112 spinlock_t *root_lock, bool validate); 113 114 void __qdisc_run(struct Qdisc *q); 115 116 static inline void qdisc_run(struct Qdisc *q) 117 { 118 if (qdisc_run_begin(q)) { 119 __qdisc_run(q); 120 qdisc_run_end(q); 121 } 122 } 123 124 static inline __be16 tc_skb_protocol(const struct sk_buff *skb) 125 { 126 /* We need to take extra care in case the skb came via 127 * vlan accelerated path. In that case, use skb->vlan_proto 128 * as the original vlan header was already stripped. 129 */ 130 if (skb_vlan_tag_present(skb)) 131 return skb->vlan_proto; 132 return skb->protocol; 133 } 134 135 /* Calculate maximal size of packet seen by hard_start_xmit 136 routine of this device. 137 */ 138 static inline unsigned int psched_mtu(const struct net_device *dev) 139 { 140 return dev->mtu + dev->hard_header_len; 141 } 142 143 static inline struct net *qdisc_net(struct Qdisc *q) 144 { 145 return dev_net(q->dev_queue->dev); 146 } 147 148 struct tc_cbs_qopt_offload { 149 u8 enable; 150 s32 queue; 151 s32 hicredit; 152 s32 locredit; 153 s32 idleslope; 154 s32 sendslope; 155 }; 156 157 #endif 158