1 #ifndef __NET_PKT_SCHED_H 2 #define __NET_PKT_SCHED_H 3 4 #include <linux/jiffies.h> 5 #include <linux/ktime.h> 6 #include <linux/if_vlan.h> 7 #include <net/sch_generic.h> 8 #include <uapi/linux/pkt_sched.h> 9 10 #define DEFAULT_TX_QUEUE_LEN 1000 11 12 struct qdisc_walker { 13 int stop; 14 int skip; 15 int count; 16 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 17 }; 18 19 #define QDISC_ALIGNTO 64 20 #define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1)) 21 22 static inline void *qdisc_priv(struct Qdisc *q) 23 { 24 return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc)); 25 } 26 27 /* 28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 29 30 Normal IP packet size ~ 512byte, hence: 31 32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 33 10Mbit ethernet. 34 35 10msec resolution -> <50Kbit/sec. 36 37 The result: [34]86 is not good choice for QoS router :-( 38 39 The things are not so bad, because we may use artificial 40 clock evaluated by integration of network data flow 41 in the most critical places. 42 */ 43 44 typedef u64 psched_time_t; 45 typedef long psched_tdiff_t; 46 47 /* Avoid doing 64 bit divide */ 48 #define PSCHED_SHIFT 6 49 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) 50 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) 51 52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 53 #define PSCHED_PASTPERFECT 0 54 55 static inline psched_time_t psched_get_time(void) 56 { 57 return PSCHED_NS2TICKS(ktime_get_ns()); 58 } 59 60 static inline psched_tdiff_t 61 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 62 { 63 return min(tv1 - tv2, bound); 64 } 65 66 struct qdisc_watchdog { 67 u64 last_expires; 68 struct hrtimer timer; 69 struct Qdisc *qdisc; 70 }; 71 72 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 73 void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires); 74 75 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 76 psched_time_t expires) 77 { 78 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 79 } 80 81 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 82 83 extern struct Qdisc_ops pfifo_qdisc_ops; 84 extern struct Qdisc_ops bfifo_qdisc_ops; 85 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; 86 87 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 88 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 89 unsigned int limit); 90 91 int register_qdisc(struct Qdisc_ops *qops); 92 int unregister_qdisc(struct Qdisc_ops *qops); 93 void qdisc_get_default(char *id, size_t len); 94 int qdisc_set_default(const char *id); 95 96 void qdisc_hash_add(struct Qdisc *q, bool invisible); 97 void qdisc_hash_del(struct Qdisc *q); 98 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 99 struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle); 100 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 101 struct nlattr *tab); 102 void qdisc_put_rtab(struct qdisc_rate_table *tab); 103 void qdisc_put_stab(struct qdisc_size_table *tab); 104 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 105 int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 106 struct net_device *dev, struct netdev_queue *txq, 107 spinlock_t *root_lock, bool validate); 108 109 void __qdisc_run(struct Qdisc *q); 110 111 static inline void qdisc_run(struct Qdisc *q) 112 { 113 if (qdisc_run_begin(q)) 114 __qdisc_run(q); 115 } 116 117 static inline __be16 tc_skb_protocol(const struct sk_buff *skb) 118 { 119 /* We need to take extra care in case the skb came via 120 * vlan accelerated path. In that case, use skb->vlan_proto 121 * as the original vlan header was already stripped. 122 */ 123 if (skb_vlan_tag_present(skb)) 124 return skb->vlan_proto; 125 return skb->protocol; 126 } 127 128 /* Calculate maximal size of packet seen by hard_start_xmit 129 routine of this device. 130 */ 131 static inline unsigned int psched_mtu(const struct net_device *dev) 132 { 133 return dev->mtu + dev->hard_header_len; 134 } 135 136 static inline bool is_classid_clsact_ingress(u32 classid) 137 { 138 /* This also returns true for ingress qdisc */ 139 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && 140 TC_H_MIN(classid) != TC_H_MIN(TC_H_MIN_EGRESS); 141 } 142 143 static inline bool is_classid_clsact_egress(u32 classid) 144 { 145 return TC_H_MAJ(classid) == TC_H_MAJ(TC_H_CLSACT) && 146 TC_H_MIN(classid) == TC_H_MIN(TC_H_MIN_EGRESS); 147 } 148 149 #endif 150