[net,v6,0/3] fix packet stuck problem for lockless qdisc

Message

Yunsheng Lin May 10, 2021, 1:42 a.m. UTC

This patchset fixes the packet stuck problem mentioned in [1].

Patch 1: Add STATE_MISSED flag to fix packet stuck problem.
Patch 2: Fix a tx_action rescheduling problem after STATE_MISSED
         flag is added in patch 1.
Patch 3: Fix the significantly higher CPU consumption problem when
         multiple threads are competing on a saturated outgoing
         device.

V6: Some performance optimization in patch 1 suggested by Jakub
    and drop NET_XMIT_DROP checking in patch 3.
V5: add patch 3 to fix the problem reported by Michal Kubecek.
V4: Change STATE_NEED_RESCHEDULE to STATE_MISSED and add patch 2.

[1]. https://lkml.org/lkml/2019/10/9/42

Yunsheng Lin (3):
  net: sched: fix packet stuck problem for lockless qdisc
  net: sched: fix endless tx action reschedule during deactivation
  net: sched: fix tx action reschedule issue with stopped queue

 include/net/pkt_sched.h   |  7 +------
 include/net/sch_generic.h | 33 ++++++++++++++++++++++++++++++++-
 net/core/dev.c            | 29 ++++++++++++++++++++++++-----
 net/sched/sch_generic.c   | 31 +++++++++++++++++++++++++++++--
 4 files changed, 86 insertions(+), 14 deletions(-)