[PATCH net v8 0/3] fix packet stuck problem for lockless qdisc

[Yunsheng Lin <linyunsheng@huawei.com>]

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.

V8: Change function name in patch 3 as suggested by Jakub, adjust
    commit log in patch 2, and add Acked-by from Jakub.
V7: Fix netif_tx_wake_queue() data race noted by Jakub.
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 tx action rescheduling issue during deactivation
  net: sched: fix tx action reschedule issue with stopped queue

 include/net/pkt_sched.h   |  7 +------
 include/net/sch_generic.h | 35 ++++++++++++++++++++++++++++++++-
 net/core/dev.c            | 29 ++++++++++++++++++++++-----
 net/sched/sch_generic.c   | 50 +++++++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 107 insertions(+), 14 deletions(-)

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2.7.4