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-rw-r--r--net/dccp/ccids/lib/tfrc_equation.c702
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diff --git a/net/dccp/ccids/lib/tfrc_equation.c b/net/dccp/ccids/lib/tfrc_equation.c
deleted file mode 100644
index 92a8c6bea316..000000000000
--- a/net/dccp/ccids/lib/tfrc_equation.c
+++ /dev/null
@@ -1,702 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- * Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
- * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
- */
-
-#include <linux/module.h>
-#include "../../dccp.h"
-#include "tfrc.h"
-
-#define TFRC_CALC_X_ARRSIZE 500
-#define TFRC_CALC_X_SPLIT 50000 /* 0.05 * 1000000, details below */
-#define TFRC_SMALLEST_P (TFRC_CALC_X_SPLIT/TFRC_CALC_X_ARRSIZE)
-
-/*
- TFRC TCP Reno Throughput Equation Lookup Table for f(p)
-
- The following two-column lookup table implements a part of the TCP throughput
- equation from [RFC 3448, sec. 3.1]:
-
- s
- X_calc = --------------------------------------------------------------
- R * sqrt(2*b*p/3) + (3 * t_RTO * sqrt(3*b*p/8) * (p + 32*p^3))
-
- Where:
- X is the transmit rate in bytes/second
- s is the packet size in bytes
- R is the round trip time in seconds
- p is the loss event rate, between 0 and 1.0, of the number of loss
- events as a fraction of the number of packets transmitted
- t_RTO is the TCP retransmission timeout value in seconds
- b is the number of packets acknowledged by a single TCP ACK
-
- We can assume that b = 1 and t_RTO is 4 * R. The equation now becomes:
-
- s
- X_calc = -------------------------------------------------------
- R * sqrt(p*2/3) + (12 * R * sqrt(p*3/8) * (p + 32*p^3))
-
- which we can break down into:
-
- s
- X_calc = ---------
- R * f(p)
-
- where f(p) is given for 0 < p <= 1 by:
-
- f(p) = sqrt(2*p/3) + 12 * sqrt(3*p/8) * (p + 32*p^3)
-
- Since this is kernel code, floating-point arithmetic is avoided in favour of
- integer arithmetic. This means that nearly all fractional parameters are
- scaled by 1000000:
- * the parameters p and R
- * the return result f(p)
- The lookup table therefore actually tabulates the following function g(q):
-
- g(q) = 1000000 * f(q/1000000)
-
- Hence, when p <= 1, q must be less than or equal to 1000000. To achieve finer
- granularity for the practically more relevant case of small values of p (up to
- 5%), the second column is used; the first one ranges up to 100%. This split
- corresponds to the value of q = TFRC_CALC_X_SPLIT. At the same time this also
- determines the smallest resolution possible with this lookup table:
-
- TFRC_SMALLEST_P = TFRC_CALC_X_SPLIT / TFRC_CALC_X_ARRSIZE
-
- The entire table is generated by:
- for(i=0; i < TFRC_CALC_X_ARRSIZE; i++) {
- lookup[i][0] = g((i+1) * 1000000/TFRC_CALC_X_ARRSIZE);
- lookup[i][1] = g((i+1) * TFRC_CALC_X_SPLIT/TFRC_CALC_X_ARRSIZE);
- }
-
- With the given configuration, we have, with M = TFRC_CALC_X_ARRSIZE-1,
- lookup[0][0] = g(1000000/(M+1)) = 1000000 * f(0.2%)
- lookup[M][0] = g(1000000) = 1000000 * f(100%)
- lookup[0][1] = g(TFRC_SMALLEST_P) = 1000000 * f(0.01%)
- lookup[M][1] = g(TFRC_CALC_X_SPLIT) = 1000000 * f(5%)
-
- In summary, the two columns represent f(p) for the following ranges:
- * The first column is for 0.002 <= p <= 1.0
- * The second column is for 0.0001 <= p <= 0.05
- Where the columns overlap, the second (finer-grained) is given preference,
- i.e. the first column is used only for p >= 0.05.
- */
-static const u32 tfrc_calc_x_lookup[TFRC_CALC_X_ARRSIZE][2] = {
- { 37172, 8172 },
- { 53499, 11567 },
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- { 243315981, 271305 }
-};
-
-/* return largest index i such that fval <= lookup[i][small] */
-static inline u32 tfrc_binsearch(u32 fval, u8 small)
-{
- u32 try, low = 0, high = TFRC_CALC_X_ARRSIZE - 1;
-
- while (low < high) {
- try = (low + high) / 2;
- if (fval <= tfrc_calc_x_lookup[try][small])
- high = try;
- else
- low = try + 1;
- }
- return high;
-}
-
-/**
- * tfrc_calc_x - Calculate the send rate as per section 3.1 of RFC3448
- * @s: packet size in bytes
- * @R: RTT scaled by 1000000 (i.e., microseconds)
- * @p: loss ratio estimate scaled by 1000000
- *
- * Returns X_calc in bytes per second (not scaled).
- */
-u32 tfrc_calc_x(u16 s, u32 R, u32 p)
-{
- u16 index;
- u32 f;
- u64 result;
-
- /* check against invalid parameters and divide-by-zero */
- BUG_ON(p > 1000000); /* p must not exceed 100% */
- BUG_ON(p == 0); /* f(0) = 0, divide by zero */
- if (R == 0) { /* possible divide by zero */
- DCCP_CRIT("WARNING: RTT is 0, returning maximum X_calc.");
- return ~0U;
- }
-
- if (p <= TFRC_CALC_X_SPLIT) { /* 0.0000 < p <= 0.05 */
- if (p < TFRC_SMALLEST_P) { /* 0.0000 < p < 0.0001 */
- DCCP_WARN("Value of p (%d) below resolution. "
- "Substituting %d\n", p, TFRC_SMALLEST_P);
- index = 0;
- } else /* 0.0001 <= p <= 0.05 */
- index = p/TFRC_SMALLEST_P - 1;
-
- f = tfrc_calc_x_lookup[index][1];
-
- } else { /* 0.05 < p <= 1.00 */
- index = p/(1000000/TFRC_CALC_X_ARRSIZE) - 1;
-
- f = tfrc_calc_x_lookup[index][0];
- }
-
- /*
- * Compute X = s/(R*f(p)) in bytes per second.
- * Since f(p) and R are both scaled by 1000000, we need to multiply by
- * 1000000^2. To avoid overflow, the result is computed in two stages.
- * This works under almost all reasonable operational conditions, for a
- * wide range of parameters. Yet, should some strange combination of
- * parameters result in overflow, the use of scaled_div32 will catch
- * this and return UINT_MAX - which is a logically adequate consequence.
- */
- result = scaled_div(s, R);
- return scaled_div32(result, f);
-}
-
-/**
- * tfrc_calc_x_reverse_lookup - try to find p given f(p)
- * @fvalue: function value to match, scaled by 1000000
- *
- * Returns closest match for p, also scaled by 1000000
- */
-u32 tfrc_calc_x_reverse_lookup(u32 fvalue)
-{
- int index;
-
- if (fvalue == 0) /* f(p) = 0 whenever p = 0 */
- return 0;
-
- /* Error cases. */
- if (fvalue < tfrc_calc_x_lookup[0][1]) {
- DCCP_WARN("fvalue %u smaller than resolution\n", fvalue);
- return TFRC_SMALLEST_P;
- }
- if (fvalue > tfrc_calc_x_lookup[TFRC_CALC_X_ARRSIZE - 1][0]) {
- DCCP_WARN("fvalue %u exceeds bounds!\n", fvalue);
- return 1000000;
- }
-
- if (fvalue <= tfrc_calc_x_lookup[TFRC_CALC_X_ARRSIZE - 1][1]) {
- index = tfrc_binsearch(fvalue, 1);
- return (index + 1) * TFRC_CALC_X_SPLIT / TFRC_CALC_X_ARRSIZE;
- }
-
- /* else ... it must be in the coarse-grained column */
- index = tfrc_binsearch(fvalue, 0);
- return (index + 1) * 1000000 / TFRC_CALC_X_ARRSIZE;
-}
-
-/**
- * tfrc_invert_loss_event_rate - Compute p so that 10^6 corresponds to 100%
- * @loss_event_rate: loss event rate to invert
- * When @loss_event_rate is large, there is a chance that p is truncated to 0.
- * To avoid re-entering slow-start in that case, we set p = TFRC_SMALLEST_P > 0.
- */
-u32 tfrc_invert_loss_event_rate(u32 loss_event_rate)
-{
- if (loss_event_rate == UINT_MAX) /* see RFC 4342, 8.5 */
- return 0;
- if (unlikely(loss_event_rate == 0)) /* map 1/0 into 100% */
- return 1000000;
- return max_t(u32, scaled_div(1, loss_event_rate), TFRC_SMALLEST_P);
-}
generated by cgit (git 2.34.1) at 2025-05-30 08:47:41 +0000