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linux-headers-6.8.0-101
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pie.h
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/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef __NET_SCHED_PIE_H #define __NET_SCHED_PIE_H #include <linux/ktime.h> #include <linux/skbuff.h> #include <linux/types.h> #include <net/inet_ecn.h> #include <net/pkt_sched.h> #define MAX_PROB (U64_MAX >> BITS_PER_BYTE) #define DTIME_INVALID U64_MAX #define QUEUE_THRESHOLD 16384 #define DQCOUNT_INVALID -1 #define PIE_SCALE 8 /** * struct pie_params - contains pie parameters * @target: target delay in pschedtime * @tupdate: interval at which drop probability is calculated * @limit: total number of packets that can be in the queue * @alpha: parameter to control drop probability * @beta: parameter to control drop probability * @ecn: is ECN marking of packets enabled * @bytemode: is drop probability scaled based on pkt size * @dq_rate_estimator: is Little's law used for qdelay calculation */ struct pie_params { psched_time_t target; u32 tupdate; u32 limit; u32 alpha; u32 beta; u8 ecn; u8 bytemode; u8 dq_rate_estimator; }; /** * struct pie_vars - contains pie variables * @qdelay: current queue delay * @qdelay_old: queue delay in previous qdelay calculation * @burst_time: burst time allowance * @dq_tstamp: timestamp at which dq rate was last calculated * @prob: drop probability * @accu_prob: accumulated drop probability * @dq_count: number of bytes dequeued in a measurement cycle * @avg_dq_rate: calculated average dq rate * @backlog_old: queue backlog during previous qdelay calculation */ struct pie_vars { psched_time_t qdelay; psched_time_t qdelay_old; psched_time_t burst_time; psched_time_t dq_tstamp; u64 prob; u64 accu_prob; u64 dq_count; u32 avg_dq_rate; u32 backlog_old; }; /** * struct pie_stats - contains pie stats * @packets_in: total number of packets enqueued * @dropped: packets dropped due to pie action * @overlimit: packets dropped due to lack of space in queue * @ecn_mark: packets marked with ECN * @maxq: maximum queue size */ struct pie_stats { u32 packets_in; u32 dropped; u32 overlimit; u32 ecn_mark; u32 maxq; }; /** * struct pie_skb_cb - contains private skb vars * @enqueue_time: timestamp when the packet is enqueued * @mem_usage: size of the skb during enqueue */ struct pie_skb_cb { psched_time_t enqueue_time; u32 mem_usage; }; static inline void pie_params_init(struct pie_params *params) { params->target = PSCHED_NS2TICKS(15 * NSEC_PER_MSEC); /* 15 ms */ params->tupdate = usecs_to_jiffies(15 * USEC_PER_MSEC); /* 15 ms */ params->limit = 1000; params->alpha = 2; params->beta = 20; params->ecn = false; params->bytemode = false; params->dq_rate_estimator = false; } static inline void pie_vars_init(struct pie_vars *vars) { vars->burst_time = PSCHED_NS2TICKS(150 * NSEC_PER_MSEC); /* 150 ms */ vars->dq_tstamp = DTIME_INVALID; vars->accu_prob = 0; vars->dq_count = DQCOUNT_INVALID; vars->avg_dq_rate = 0; } static inline struct pie_skb_cb *get_pie_cb(const struct sk_buff *skb) { qdisc_cb_private_validate(skb, sizeof(struct pie_skb_cb)); return (struct pie_skb_cb *)qdisc_skb_cb(skb)->data; } static inline psched_time_t pie_get_enqueue_time(const struct sk_buff *skb) { return get_pie_cb(skb)->enqueue_time; } static inline void pie_set_enqueue_time(struct sk_buff *skb) { get_pie_cb(skb)->enqueue_time = psched_get_time(); } bool pie_drop_early(struct Qdisc *sch, struct pie_params *params, struct pie_vars *vars, u32 backlog, u32 packet_size); void pie_process_dequeue(struct sk_buff *skb, struct pie_params *params, struct pie_vars *vars, u32 backlog); void pie_calculate_probability(struct pie_params *params, struct pie_vars *vars, u32 backlog); #endif