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    Subject[patch 26/47] tcp: Allow send-limited cwnd to grow up to max_burst when gso disabled
    -stable review patch.  If anyone has any objections, please let us know.

    ------------------
    From: John Heffner <johnwheffner@gmail.com>

    [ upstream commit: ce447eb91409225f8a488f6b7b2a1bdf7b2d884f ]

    This changes the logic in tcp_is_cwnd_limited() so that cwnd may grow
    up to tcp_max_burst() even when sk_can_gso() is false, or when
    sysctl_tcp_tso_win_divisor != 0.

    Signed-off-by: John Heffner <johnwheffner@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---
    net/ipv4/tcp_cong.c | 11 ++++-------
    1 file changed, 4 insertions(+), 7 deletions(-)

    --- a/net/ipv4/tcp_cong.c
    +++ b/net/ipv4/tcp_cong.c
    @@ -285,14 +285,11 @@ int tcp_is_cwnd_limited(const struct soc
    if (in_flight >= tp->snd_cwnd)
    return 1;

    - if (!sk_can_gso(sk))
    - return 0;
    -
    left = tp->snd_cwnd - in_flight;
    - if (sysctl_tcp_tso_win_divisor)
    - return left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd;
    - else
    - return left <= tcp_max_burst(tp);
    + if (sk_can_gso(sk) &&
    + left * sysctl_tcp_tso_win_divisor < tp->snd_cwnd)
    + return 1;
    + return left <= tcp_max_burst(tp);
    }
    EXPORT_SYMBOL_GPL(tcp_is_cwnd_limited);

    --


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