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Date:   Fri, 17 Jan 2020 15:39:19 +0530
Cc:     Gautam Ramakrishnan <>,
        Jamal Hadi Salim <>,
        "David S . Miller" <>,
        Dave Taht <>,
        Toke Høiland-Jørgensen <>,
        Jakub Kicinski <>,
        Stephen Hemminger <>,
        Leslie Monis <>,
        "Mohit P . Tahiliani" <>
Subject: [PATCH net-next v4 0/2] net: sched: add Flow Queue PIE packet scheduler

From: Gautam Ramakrishnan <>

Flow Queue PIE packet scheduler

This patch series implements the Flow Queue Proportional
Integral controller Enhanced (FQ-PIE) active queue
Management algorithm. It is an enhancement over the PIE
algorithm. It integrates the PIE aqm with a deficit round robin

FQ-PIE is implemented over the latest version of PIE which
uses timestamps to calculate queue delay with an additional
option of using average dequeue rate to calculate the queue
delay. This patch also adds a memory limit of all the packets
across all queues to a default value of 32Mb.

For more information:

Changes from v3 to v4
 - Used non deprecated version of nla_parse_nested
 - Used SZ_32M macro
 - Removed an unused variable
 - Code cleanup
 All suggested by Jakub and Toke.

Changes from v2 to v3
 - Exported drop_early, pie_process_dequeue and
   calculate_probability functions from sch_pie as
   suggested by Stephen Hemminger.

Changes from v1 ( and RFC patch) to v2
 - Added timestamp to calculate queue delay as recommended
   by Dave Taht
 - Packet memory limit implemented as recommended by Toke.
 - Added external classifier as recommended by Toke.
 - Used NET_XMIT_CN instead of NET_XMIT_DROP as the return
   value in the fq_pie_qdisc_enqueue function.

Mohit P. Tahiliani (2):
  net: sched: pie: refactor code
  net: sched: add Flow Queue PIE packet scheduler

 include/net/pie.h              | 138 ++++++++
 include/uapi/linux/pkt_sched.h |  31 ++
 net/sched/Kconfig              |  13 +
 net/sched/Makefile             |   1 +
 net/sched/sch_fq_pie.c         | 559 +++++++++++++++++++++++++++++++++
 net/sched/sch_pie.c            | 302 +++++++-----------
 6 files changed, 854 insertions(+), 190 deletions(-)
 create mode 100644 include/net/pie.h
 create mode 100644 net/sched/sch_fq_pie.c


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