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tcp: extract the function to compute delivery rate

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Refactor the code to extract the function to compute delivery rate.
This function will be used in later commit.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-07-28 10:28:20 -07:00 committed by David S. Miller
parent 6a95befc8d
commit 0263598c77
1 changed files with 16 additions and 7 deletions
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23
net/ipv4/tcp.c
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@ -388,6 +388,19 @@ static int retrans_to_secs(u8 retrans, int timeout, int rto_max)
return period;
}
static u64 tcp_compute_delivery_rate(const struct tcp_sock *tp)
{
u32 rate = READ_ONCE(tp->rate_delivered);
u32 intv = READ_ONCE(tp->rate_interval_us);
u64 rate64 = 0;
if (rate && intv) {
rate64 = (u64)rate * tp->mss_cache * USEC_PER_SEC;
do_div(rate64, intv);
}
return rate64;
}
/* Address-family independent initialization for a tcp_sock.
*
* NOTE: A lot of things set to zero explicitly by call to
@ -2716,7 +2729,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
{
const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */
const struct inet_connection_sock *icsk = inet_csk(sk);
u32 now, intv;
u32 now;
u64 rate64;
bool slow;
u32 rate;
@ -2815,13 +2828,9 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_data_segs_out = tp->data_segs_out;
info->tcpi_delivery_rate_app_limited = tp->rate_app_limited ? 1 : 0;
rate = READ_ONCE(tp->rate_delivered);
intv = READ_ONCE(tp->rate_interval_us);
if (rate && intv) {
rate64 = (u64)rate * tp->mss_cache * USEC_PER_SEC;
do_div(rate64, intv);
rate64 = tcp_compute_delivery_rate(tp);
if (rate64)
info->tcpi_delivery_rate = rate64;
}
unlock_sock_fast(sk, slow);
}
EXPORT_SYMBOL_GPL(tcp_get_info);