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 <net/sch_generic.h> 9 #include <uapi/linux/pkt_sched.h> 10 11 #define DEFAULT_TX_QUEUE_LEN 1000 12 13 struct qdisc_walker { 14 int stop; 15 int skip; 16 int count; 17 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 18 }; 19 20 #define QDISC_ALIGNTO 64 21 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) 22 23 static inline void *qdisc_priv(struct Qdisc *q) 24 { 25 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); 26 } 27 28 /* 29 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 30 31 Normal IP packet size ~ 512byte, hence: 32 33 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 34 10Mbit ethernet. 35 36 10msec resolution -> <50Kbit/sec. 37 38 The result: [34]86 is not good choice for QoS router :-( 39 40 The things are not so bad, because we may use artificial 41 clock evaluated by integration of network data flow 42 in the most critical places. 43 */ 44 45 typedef u64 psched_time_t; 46 typedef long psched_tdiff_t; 47 48 /* Avoid doing 64 bit divide */ 49 #define PSCHED_SHIFT 6 50 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) 51 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) 52 53 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 54 #define PSCHED_PASTPERFECT 0 55 56 static inline psched_time_t psched_get_time(void) 57 { 58 return PSCHED_NS2TICKS(ktime_get_ns()); 59 } 60 61 static inline psched_tdiff_t 62 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 63 { 64 return min(tv1 - tv2, bound); 65 } 66 67 struct qdisc_watchdog { 68 u64 last_expires; 69 struct hrtimer timer; 70 struct Qdisc *qdisc; 71 }; 72 73 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 74 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); 75 76 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 77 psched_time_t expires) 78 { 79 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 80 } 81 82 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 83 84 extern struct Qdisc_ops pfifo_qdisc_ops; 85 extern struct Qdisc_ops bfifo_qdisc_ops; 86 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; 87 88 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 89 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 90 unsigned int limit); 91 92 int register_qdisc(struct Qdisc_ops *qops); 93 int unregister_qdisc(struct Qdisc_ops *qops); 94 void qdisc_get_default(char *id, size_t len); 95 int qdisc_set_default(const char *id); 96 97 void qdisc_hash_add(struct Qdisc *q, bool invisible); 98 void qdisc_hash_del(struct Qdisc *q); 99 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 100 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); 101 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 102 struct nlattr *tab); 103 void qdisc_put_rtab(struct qdisc_rate_table *tab); 104 void qdisc_put_stab(struct qdisc_size_table *tab); 105 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 106 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 107 struct net_device *dev, struct netdev_queue *txq, 108 spinlock_t *root_lock, bool validate); 109 110 void __qdisc_run(struct Qdisc *q); 111 112 static inline void qdisc_run(struct Qdisc *q) 113 { 114 if (qdisc_run_begin(q)) 115 __qdisc_run(q); 116 } 117 118 static inline __be16 tc_skb_protocol(const struct sk_buff *skb) 119 { 120 /* We need to take extra care in case the skb came via 121 * vlan accelerated path. In that case, use skb->vlan_proto 122 * as the original vlan header was already stripped. 123 */ 124 if (skb_vlan_tag_present(skb)) 125 return skb->vlan_proto; 126 return skb->protocol; 127 } 128 129 /* Calculate maximal size of packet seen by hard_start_xmit 130 routine of this device. 131 */ 132 static inline unsigned int psched_mtu(const struct net_device *dev) 133 { 134 return dev->mtu + dev->hard_header_len; 135 } 136 137 static inline bool is_classid_clsact_ingress(u32 classid) 138 { 139 /* This also returns true for ingress qdisc */ 140 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && 141 TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS); 142 } 143 144 static inline bool is_classid_clsact_egress(u32 classid) 145 { 146 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && 147 TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS); 148 } 149 150 #endif 151