6b13f685e
 김민수
BSP 최초 추가
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#include <linux/module.h>
#include <net/tcp.h>
static const struct hstcp_aimd_val {
unsigned int cwnd;
unsigned int md;
} hstcp_aimd_vals[] = {
{ 38, 128, },
{ 118, 112, },
{ 221, 104, },
{ 347, 98, },
{ 495, 93, },
{ 663, 89, },
{ 851, 86, },
{ 1058, 83, },
{ 1284, 81, },
{ 1529, 78, },
{ 1793, 76, },
{ 2076, 74, },
{ 2378, 72, },
{ 2699, 71, },
{ 3039, 69, },
{ 3399, 68, },
{ 3778, 66, },
{ 4177, 65, },
{ 4596, 64, },
{ 5036, 62, },
{ 5497, 61, },
{ 5979, 60, },
{ 6483, 59, },
{ 7009, 58, },
{ 7558, 57, },
{ 8130, 56, },
{ 8726, 55, },
{ 9346, 54, },
{ 9991, 53, },
{ 10661, 52, },
{ 11358, 52, },
{ 12082, 51, },
{ 12834, 50, },
{ 13614, 49, },
{ 14424, 48, },
{ 15265, 48, },
{ 16137, 47, },
{ 17042, 46, },
{ 17981, 45, },
{ 18955, 45, },
{ 19965, 44, },
{ 21013, 43, },
{ 22101, 43, },
{ 23230, 42, },
{ 24402, 41, },
{ 25618, 41, },
{ 26881, 40, },
{ 28193, 39, },
{ 29557, 39, },
{ 30975, 38, },
{ 32450, 38, },
{ 33986, 37, },
{ 35586, 36, },
{ 37253, 36, },
{ 38992, 35, },
{ 40808, 35, },
{ 42707, 34, },
{ 44694, 33, },
{ 46776, 33, },
{ 48961, 32, },
{ 51258, 32, },
{ 53677, 31, },
{ 56230, 30, },
{ 58932, 30, },
{ 61799, 29, },
{ 64851, 28, },
{ 68113, 28, },
{ 71617, 27, },
{ 75401, 26, },
{ 79517, 26, },
{ 84035, 25, },
{ 89053, 24, },
};
#define HSTCP_AIMD_MAX ARRAY_SIZE(hstcp_aimd_vals)
struct hstcp {
u32 ai;
};
static void hstcp_init(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
struct hstcp *ca = inet_csk_ca(sk);
ca->ai = 0;
tp->snd_cwnd_clamp = min_t(u32, tp->snd_cwnd_clamp, 0xffffffff/128);
}
static void hstcp_cong_avoid(struct sock *sk, u32 ack, u32 acked, u32 in_flight)
{
struct tcp_sock *tp = tcp_sk(sk);
struct hstcp *ca = inet_csk_ca(sk);
if (!tcp_is_cwnd_limited(sk, in_flight))
return;
if (tp->snd_cwnd <= tp->snd_ssthresh)
tcp_slow_start(tp, acked);
else {
if (tp->snd_cwnd > hstcp_aimd_vals[ca->ai].cwnd) {
while (tp->snd_cwnd > hstcp_aimd_vals[ca->ai].cwnd &&
ca->ai < HSTCP_AIMD_MAX - 1)
ca->ai++;
} else if (ca->ai && tp->snd_cwnd <= hstcp_aimd_vals[ca->ai-1].cwnd) {
while (ca->ai && tp->snd_cwnd <= hstcp_aimd_vals[ca->ai-1].cwnd)
ca->ai--;
}
if (tp->snd_cwnd < tp->snd_cwnd_clamp) {
tp->snd_cwnd_cnt += ca->ai + 1;
if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
tp->snd_cwnd_cnt -= tp->snd_cwnd;
tp->snd_cwnd++;
}
}
}
}
static u32 hstcp_ssthresh(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
const struct hstcp *ca = inet_csk_ca(sk);
return max(tp->snd_cwnd - ((tp->snd_cwnd * hstcp_aimd_vals[ca->ai].md) >> 8), 2U);
}
static struct tcp_congestion_ops tcp_highspeed __read_mostly = {
.init = hstcp_init,
.ssthresh = hstcp_ssthresh,
.cong_avoid = hstcp_cong_avoid,
.min_cwnd = tcp_reno_min_cwnd,
.owner = THIS_MODULE,
.name = "highspeed"
};
static int __init hstcp_register(void)
{
BUILD_BUG_ON(sizeof(struct hstcp) > ICSK_CA_PRIV_SIZE);
return tcp_register_congestion_control(&tcp_highspeed);
}
static void __exit hstcp_unregister(void)
{
tcp_unregister_congestion_control(&tcp_highspeed);
}
module_init(hstcp_register);
module_exit(hstcp_unregister);
MODULE_AUTHOR("John Heffner");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("High Speed TCP");
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