This patch series is sent as reference, especially because the last patch is trying not to be creating too many layer violations, but clearly there are a little bit being created here anyways.
Essentially what I am trying to achieve is that you have a stacked device which is multi-queue aware, that applications will be using, and for which they can control the queue selection (using mq) the way they want. Each of each stacked network devices are created for each port of the switch (this is what DSA does). When a skb is submitted from say net_device X, we can derive its port number and look at the queue_mapping value to determine which port of the switch and queue we should be sending this to. The information is embedded in a tag (4 bytes) and is used by the switch to steer the transmission. These stacked devices will actually transmit using a "master" or conduit network device which has a number of queues as well. In one version of the hardware that I work with, we have up to 4 ports, each with 8 queues, and the master device has a total of 32 hardware queues, so a 1:1 mapping is easy. With another version of the hardware, same number of ports and queues, but only 16 hardware queues, so only a 2:1 mapping is possible. In order for congestion information to work properly, I need to establish a mapping, preferably before transmission starts (but reconfiguration while interfaces are running would be possible too) between these stacked device's queue and the conduit interface's queue. Comments, flames, rotten tomatoes, anything! Florian Fainelli (8): net: dsa: Allow switch drivers to indicate number of RX/TX queues net: dsa: tag_brcm: Set output queue from skb queue mapping net: dsa: bcm_sf2: Advertise number of egress queues net: dsa: bcm_sf2: Configure IMP port TC2QOS mapping net: dsa: bcm_sf2: Fix number of CFP entries for BCM7278 net: dsa: Expose dsa_slave_dev_check and dsa_slave_dev_port_num net: dsa: tag_brcm: Indicate to master netdevice port + queue net: systemport: Establish DSA network device queue mapping drivers/net/dsa/bcm_sf2.c | 16 +++++ drivers/net/dsa/bcm_sf2.h | 1 + drivers/net/dsa/bcm_sf2_cfp.c | 8 +-- drivers/net/ethernet/broadcom/bcmsysport.c | 100 +++++++++++++++++++++++++++-- drivers/net/ethernet/broadcom/bcmsysport.h | 11 +++- include/net/dsa.h | 19 ++++++ net/dsa/slave.c | 22 +++++-- net/dsa/tag_brcm.c | 8 ++- 8 files changed, 170 insertions(+), 15 deletions(-) -- 1.9.1
