114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/* Copyright (c) 2017 LiteSpeed Technologies Inc. See LICENSE. */
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/queue.h>
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#include "lsquic.h"
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#include "lsquic_types.h"
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#include "lsquic_int_types.h"
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#include "lsquic_rtt.h"
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#include "lsquic_conn_flow.h"
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#include "lsquic_sfcw.h"
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#include "lsquic_stream.h"
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#include "lsquic_conn_public.h"
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#include "lsquic_mm.h"
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#include "lsquic_engine_public.h"
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#include "lsquic_util.h"
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#include "lsquic_conn.h"
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#include "lsquic_ev_log.h"
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#define LSQUIC_LOGGER_MODULE LSQLM_CFCW
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#define LSQUIC_LOG_CONN_ID fc->cf_conn_pub->lconn->cn_cid
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#include "lsquic_logger.h"
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void
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lsquic_cfcw_init (struct lsquic_cfcw *fc, struct lsquic_conn_public *cpub,
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unsigned max_recv_window)
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{
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memset(fc, 0, sizeof(*fc));
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fc->cf_max_recv_win = max_recv_window;
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fc->cf_conn_pub = cpub;
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(void) lsquic_cfcw_fc_offsets_changed(fc);
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}
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static void
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cfcw_maybe_increase_max_window (struct lsquic_cfcw *fc)
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{
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unsigned new_max_window;
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new_max_window = fc->cf_max_recv_win * 2;
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/* Do not increase past explicitly specified maximum */
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if (new_max_window > fc->cf_conn_pub->enpub->enp_settings.es_max_cfcw)
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new_max_window = fc->cf_conn_pub->enpub->enp_settings.es_max_cfcw;
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if (new_max_window > fc->cf_max_recv_win)
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{
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LSQ_DEBUG("max window increase %u -> %u", fc->cf_max_recv_win,
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new_max_window);
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EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID,
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"max CFCW increase %u -> %u", fc->cf_max_recv_win,
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new_max_window);
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fc->cf_max_recv_win = new_max_window;
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}
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else
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LSQ_DEBUG("max window could use an increase, but we're stuck "
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"at %u", fc->cf_max_recv_win);
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}
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int
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lsquic_cfcw_fc_offsets_changed (struct lsquic_cfcw *fc)
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{
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lsquic_time_t now, since_last_update, srtt;
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if (fc->cf_recv_off - fc->cf_read_off >= fc->cf_max_recv_win / 2)
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return 0;
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now = lsquic_time_now();
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since_last_update = now - fc->cf_last_updated;
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fc->cf_last_updated = now;
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srtt = lsquic_rtt_stats_get_srtt(&fc->cf_conn_pub->rtt_stats);
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if (since_last_update < srtt * 2)
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cfcw_maybe_increase_max_window(fc);
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fc->cf_recv_off = fc->cf_read_off + fc->cf_max_recv_win;
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LSQ_DEBUG("recv_off changed: read_off: %"PRIu64"; recv_off: %"
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PRIu64"", fc->cf_read_off, fc->cf_recv_off);
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return 1;
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}
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int
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lsquic_cfcw_incr_max_recv_off (struct lsquic_cfcw *fc, uint64_t incr)
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{
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if (fc->cf_max_recv_off + incr <= fc->cf_recv_off)
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{
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fc->cf_max_recv_off += incr;
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LSQ_DEBUG("max_recv_off goes from %"PRIu64" to %"PRIu64"",
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fc->cf_max_recv_off - incr, fc->cf_max_recv_off);
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return 1;
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}
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else
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{
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LSQ_WARN("flow control violation: received at offset %"PRIu64", while "
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"flow control receive offset is %"PRIu64,
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fc->cf_max_recv_off + incr, fc->cf_recv_off);
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return 0;
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}
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}
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void
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lsquic_cfcw_incr_read_off (struct lsquic_cfcw *fc, uint64_t incr)
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{
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fc->cf_read_off += incr;
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LSQ_DEBUG("read_off goes from %"PRIu64" to %"PRIu64,
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fc->cf_read_off - incr, fc->cf_read_off);
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}
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