From: Jiri Pirko <j...@mellanox.com> Ido says:
This patchset introduces support for Quality of Service (QoS) as part of the IEEE Data Center Bridiging (DCB) standards. Patches 1-9 do the required device initialization. Specifically, patches 1-6 initialize the ports' headroom buffers, which are used at ingress to store incoming packets while they go through the switch's pipeline. Patches 7-9 complete them by initializing the egress scheduling. The pipeline mentioned above determines the packet's egress port(s) and traffic class. Ideally, once out of the pipeline the packet moves to the switch's shared buffer (to be introduced in Jiri's patchset, currently default values are used) and scheduled for transmission according to its traffic class. The egress scheduling is configured according to the 802.1Qaz standard, which is part of the DCB infrastructure supported by Linux. This is introduced in patches 10-12. Even after going through the pipeline packets are not always eligible to enter the shared buffer. This is determined by the amount of available space and the quotas associated with the packet. However, if flow control is enabled and the packet is associated with the lossless flow, then it will stay in the headroom and won't be discarded. This is introduced in patches 13-17. Please check individual commit messages for more info, as I tried to keep them pretty detailed. Thanks. Ido Schimmel (17): mlxsw: reg: Add Port Prio To Buffer register mlxsw: spectrum: Map all switch priorities to priority group 0 mlxsw: spectrum: Add bytes to cells helper mlxsw: spectrum: Correctly configure headroom size mlxsw: reg: Use correct PBMC register length mlxsw: spectrum: Set port's shared buffer size to 0 mlxsw: reg: Add QoS ETS Element Configuration register mlxsw: reg: Add QoS Switch Traffic Class Table register mlxsw: spectrum: Initialize egress scheduling mlxsw: spectrum: Introduce support for Data Center Bridging (DCB) mlxsw: spectrum: Add IEEE 802.1Qaz ETS support mlxsw: spectrum: Allow setting maximum rate for a TC mlxsw: reg: Add Port Flow Control Configuration register mlxsw: reg: Add lossless settings for PBMC register mlxsw: spectrum: Add support for PAUSE frames mlxsw: reg: Introduce per priority counters mlxsw: spectrum: Add IEEE 802.1Qbb PFC support drivers/net/ethernet/mellanox/mlxsw/Kconfig | 8 + drivers/net/ethernet/mellanox/mlxsw/Makefile | 1 + drivers/net/ethernet/mellanox/mlxsw/reg.h | 507 ++++++++++++++++++++- drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 263 ++++++++++- drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 61 +++ .../net/ethernet/mellanox/mlxsw/spectrum_buffers.c | 108 +++-- drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c | 480 +++++++++++++++++++ drivers/net/ethernet/mellanox/mlxsw/switchx2.c | 3 +- 8 files changed, 1381 insertions(+), 50 deletions(-) create mode 100644 drivers/net/ethernet/mellanox/mlxsw/spectrum_dcb.c -- 2.5.5
