[PATCH v2 0/4] net: ethernet: ti: cpsw: add cpdma multi-queue support

[Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>]

This series is intended to allow cpsw driver to use cpdma ability of
h/w shaper to send/receive data with up to 8 tx and 8 rx queues. This
series doesn't contain interface to configure h/w shaper itself, it
contains only multi-queue support part and ability to configure number
of tx/rx queues with ethtool, it also doesn't contain mapping of input
traffic to rx queues, as it can depend on usage and requires separate
interface for setup.

Default shaper mode - priority mode. The h/w shaper configuration will
be added with separate patch series. This series doesn't affect on net
throughput.

Tested on:
am572x-idk, 1Gbps link
am335-boneblack, 100Mbps link.

A simple example for splitting traffic on queues:

#check how many queues are supported and active:
$ ethtool -l eth0

#increase number of active rx and tx queues,
#by default 1 rx and 1 tx queue
#can be set any combination of 0 < rx <= 8 and 0 < tx <= 8
$ ethtool -L eth0 rx 8 tx 8

#set multi-queue-aware queuing discipline
$ tc qdisc add dev eth0 root handle 1: multiq

#send packets with ip 172.22.39.12 to queue #5 which can be
#prioritized or throughput limited by h/w shaper.
$ tc filter add dev eth0 parent 1: protocol ip prio 1 u32 \
    match ip dst 172.22.39.12 \
    action skbedit queue_mapping 5

Based on: net-next/master
V1: https://lkml.org/lkml/2016/6/30/603

Since V1:
- removed cpdam_check_free_desc function
- remove pm_runtime calls as they are used in begin/complete ethtool calls now
- removed change of driver version. it can be done later
- corrected setup of channels for dual_emac mode with ethtool

Ivan Khoronzhuk (4):
  net: ethernet: ti: davinci_cpdma: split descs num between all channels
  net: ethernet: ti: cpsw: add multi queue support
  net: ethernet: ti: davinci_cpdma: move cpdma channel struct macroses
    to internals
  net: ethernet: ti: cpsw: add ethtool channels support

 drivers/net/ethernet/ti/cpsw.c          | 484 +++++++++++++++++++++++++-------
 drivers/net/ethernet/ti/davinci_cpdma.c |  72 ++++-
 drivers/net/ethernet/ti/davinci_cpdma.h |  13 +-
 drivers/net/ethernet/ti/davinci_emac.c  |   8 +-
 4 files changed, 455 insertions(+), 122 deletions(-)

-- 
1.9.1