net: sched: Allow changing default qdisc to FQ-PIE

Similar to fq_codel and the other qdiscs that can set as default,
fq_pie is also suitable for general use without explicit configuration,
which makes it a valid choice for this.

This is useful in situations where a painless out-of-the-box solution
for reducing bufferbloat is desired but fq_codel is not necessarily the
best choice. For example, fq_pie can be better for DASH streaming, but
there could be more cases where it's the better choice of the two simple
AQMs available in the kernel.

Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 84badf0..a3b37d8 100644 (file)
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -468,6 +468,9 @@ choice
        config DEFAULT_FQ_CODEL
                bool "Fair Queue Controlled Delay" if NET_SCH_FQ_CODEL
 
+       config DEFAULT_FQ_PIE
+               bool "Flow Queue Proportional Integral controller Enhanced" if NET_SCH_FQ_PIE
+
        config DEFAULT_SFQ
                bool "Stochastic Fair Queue" if NET_SCH_SFQ
 
@@ -480,6 +483,7 @@ config DEFAULT_NET_SCH
        default "pfifo_fast" if DEFAULT_PFIFO_FAST
        default "fq" if DEFAULT_FQ
        default "fq_codel" if DEFAULT_FQ_CODEL
+       default "fq_pie" if DEFAULT_FQ_PIE
        default "sfq" if DEFAULT_SFQ
        default "pfifo_fast"
 endif