diff options
| author | Wen Yang <wenyang@linux.alibaba.com> | 2020-01-20 18:04:56 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-01-21 10:45:49 +0100 |
| commit | 5b2f1f3070b6447b76174ea8bfb7390dc6253ebd (patch) | |
| tree | 1c9a026cc81dde4020ca68da9ed68dc0978a2a47 /net/ipv4 | |
| parent | cb626bf566eb4433318d35681286c494f04fedcc (diff) | |
| download | linux-5b2f1f3070b6447b76174ea8bfb7390dc6253ebd.tar.bz2 | |
tcp_bbr: improve arithmetic division in bbr_update_bw()
do_div() does a 64-by-32 division. Use div64_long() instead of it
if the divisor is long, to avoid truncation to 32-bit.
And as a nice side effect also cleans up the function a bit.
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp_bbr.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c index a6545ef0d27b..6c4d79baff26 100644 --- a/net/ipv4/tcp_bbr.c +++ b/net/ipv4/tcp_bbr.c @@ -779,8 +779,7 @@ static void bbr_update_bw(struct sock *sk, const struct rate_sample *rs) * bandwidth sample. Delivered is in packets and interval_us in uS and * ratio will be <<1 for most connections. So delivered is first scaled. */ - bw = (u64)rs->delivered * BW_UNIT; - do_div(bw, rs->interval_us); + bw = div64_long((u64)rs->delivered * BW_UNIT, rs->interval_us); /* If this sample is application-limited, it is likely to have a very * low delivered count that represents application behavior rather than |