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/*
* Ouroboros - Copyright (C) 2016 - 2026
*
* Link capacity estimation
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_LIB_CAP_H
#define OUROBOROS_LIB_CAP_H
#include <stddef.h>
#include <stdint.h>
#define CAP_ALIGN 64
struct cap_est {
uint64_t c_pkt; /* total packets enqueued (relaxed) */
uint64_t c_byt; /* total bytes enqueued (relaxed) */
uint64_t c_idl; /* times ring seen empty (relaxed) */
uint64_t t_gate; /* last window close (ns) */
uint64_t t_last; /* last update, to spot a gap (ns) */
uint8_t busy; /* close in progress (try-lock) */
uint64_t t0; /* window start (ns), 0 = no window */
uint64_t q0; /* ring occupancy at window start */
uint64_t pkt0; /* c_pkt snapshot at window start */
uint64_t byt0; /* c_byt snapshot at window start */
uint64_t idl0; /* c_idl snapshot at window start */
uint64_t rate; /* filtered drain rate (bytes/s) */
uint64_t est; /* published estimate (bytes/s) */
} __attribute__((aligned(CAP_ALIGN)));
void cap_clear(struct cap_est * e);
void cap_update(struct cap_est * e,
size_t qlen,
size_t len);
void cap_update_at(struct cap_est * e,
size_t qlen,
size_t len,
uint64_t now);
uint64_t cap_rate(const struct cap_est * e);
#endif /* OUROBOROS_LIB_CAP_H */
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