[Patch net-next v2 0/3] net_sched: reflect tx_queue_len change for pfifo_fast

[Cong Wang <xiyou.wangcong@gmail.com>]

This pathcset restores the pfifo_fast qdisc behavior of dropping
packets based on latest dev->tx_queue_len. Patch 1 introduces
a helper, patch 2 introduces a new Qdisc ops which is called when
we modify tx_queue_len, patch 3 implements this ops for pfifo_fast.

Please see each patch for details.

---
v2: handle error case for ->change_tx_queue_len()

Cong Wang (3):
  net: introduce helper dev_change_tx_queue_len()
  net_sched: plug in qdisc ops change_tx_queue_len
  net_sched: implement ->change_tx_queue_len() for pfifo_fast

 include/linux/netdevice.h |  1 +
 include/net/sch_generic.h |  2 ++
 net/core/dev.c            | 29 +++++++++++++++++++++++++++
 net/core/net-sysfs.c      | 25 +-----------------------
 net/core/rtnetlink.c      | 18 +++++------------
 net/sched/sch_generic.c   | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 88 insertions(+), 37 deletions(-)

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2.13.0