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Merge tag 'v4.12-rc5' into for-4.13/block
We've already got a few conflicts and upcoming work depends on some of the changes that have gone into mainline as regression fixes for this series. Pull in 4.12-rc5 to resolve these conflicts and make it easier on down stream trees to continue working on 4.13 changes. Signed-off-by: Jens Axboe <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| The QorIQ DPAA Ethernet Driver | ||
| ============================== | ||
|
|
||
| Authors: | ||
| Madalin Bucur <[email protected]> | ||
| Camelia Groza <[email protected]> | ||
|
|
||
| Contents | ||
| ======== | ||
|
|
||
| - DPAA Ethernet Overview | ||
| - DPAA Ethernet Supported SoCs | ||
| - Configuring DPAA Ethernet in your kernel | ||
| - DPAA Ethernet Frame Processing | ||
| - DPAA Ethernet Features | ||
| - Debugging | ||
|
|
||
| DPAA Ethernet Overview | ||
| ====================== | ||
|
|
||
| DPAA stands for Data Path Acceleration Architecture and it is a | ||
| set of networking acceleration IPs that are available on several | ||
| generations of SoCs, both on PowerPC and ARM64. | ||
|
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| The Freescale DPAA architecture consists of a series of hardware blocks | ||
| that support Ethernet connectivity. The Ethernet driver depends upon the | ||
| following drivers in the Linux kernel: | ||
|
|
||
| - Peripheral Access Memory Unit (PAMU) (* needed only for PPC platforms) | ||
| drivers/iommu/fsl_* | ||
| - Frame Manager (FMan) | ||
| drivers/net/ethernet/freescale/fman | ||
| - Queue Manager (QMan), Buffer Manager (BMan) | ||
| drivers/soc/fsl/qbman | ||
|
|
||
| A simplified view of the dpaa_eth interfaces mapped to FMan MACs: | ||
|
|
||
| dpaa_eth /eth0\ ... /ethN\ | ||
| driver | | | | | ||
| ------------- ---- ----------- ---- ------------- | ||
| -Ports / Tx Rx \ ... / Tx Rx \ | ||
| FMan | | | | | ||
| -MACs | MAC0 | | MACN | | ||
| / dtsec0 \ ... / dtsecN \ (or tgec) | ||
| / \ / \(or memac) | ||
| --------- -------------- --- -------------- --------- | ||
| FMan, FMan Port, FMan SP, FMan MURAM drivers | ||
| --------------------------------------------------------- | ||
| FMan HW blocks: MURAM, MACs, Ports, SP | ||
| --------------------------------------------------------- | ||
|
|
||
| The dpaa_eth relation to the QMan, BMan and FMan: | ||
| ________________________________ | ||
| dpaa_eth / eth0 \ | ||
| driver / \ | ||
| --------- -^- -^- -^- --- --------- | ||
| QMan driver / \ / \ / \ \ / | BMan | | ||
| |Rx | |Rx | |Tx | |Tx | | driver | | ||
| --------- |Dfl| |Err| |Cnf| |FQs| | | | ||
| QMan HW |FQ | |FQ | |FQs| | | | | | ||
| / \ / \ / \ \ / | | | ||
| --------- --- --- --- -v- --------- | ||
| | FMan QMI | | | ||
| | FMan HW FMan BMI | BMan HW | | ||
| ----------------------- -------- | ||
|
|
||
| where the acronyms used above (and in the code) are: | ||
| DPAA = Data Path Acceleration Architecture | ||
| FMan = DPAA Frame Manager | ||
| QMan = DPAA Queue Manager | ||
| BMan = DPAA Buffers Manager | ||
| QMI = QMan interface in FMan | ||
| BMI = BMan interface in FMan | ||
| FMan SP = FMan Storage Profiles | ||
| MURAM = Multi-user RAM in FMan | ||
| FQ = QMan Frame Queue | ||
| Rx Dfl FQ = default reception FQ | ||
| Rx Err FQ = Rx error frames FQ | ||
| Tx Cnf FQ = Tx confirmation FQs | ||
| Tx FQs = transmission frame queues | ||
| dtsec = datapath three speed Ethernet controller (10/100/1000 Mbps) | ||
| tgec = ten gigabit Ethernet controller (10 Gbps) | ||
| memac = multirate Ethernet MAC (10/100/1000/10000) | ||
|
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| DPAA Ethernet Supported SoCs | ||
| ============================ | ||
|
|
||
| The DPAA drivers enable the Ethernet controllers present on the following SoCs: | ||
|
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||
| # PPC | ||
| P1023 | ||
| P2041 | ||
| P3041 | ||
| P4080 | ||
| P5020 | ||
| P5040 | ||
| T1023 | ||
| T1024 | ||
| T1040 | ||
| T1042 | ||
| T2080 | ||
| T4240 | ||
| B4860 | ||
|
|
||
| # ARM | ||
| LS1043A | ||
| LS1046A | ||
|
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| Configuring DPAA Ethernet in your kernel | ||
| ======================================== | ||
|
|
||
| To enable the DPAA Ethernet driver, the following Kconfig options are required: | ||
|
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||
| # common for arch/arm64 and arch/powerpc platforms | ||
| CONFIG_FSL_DPAA=y | ||
| CONFIG_FSL_FMAN=y | ||
| CONFIG_FSL_DPAA_ETH=y | ||
| CONFIG_FSL_XGMAC_MDIO=y | ||
|
|
||
| # for arch/powerpc only | ||
| CONFIG_FSL_PAMU=y | ||
|
|
||
| # common options needed for the PHYs used on the RDBs | ||
| CONFIG_VITESSE_PHY=y | ||
| CONFIG_REALTEK_PHY=y | ||
| CONFIG_AQUANTIA_PHY=y | ||
|
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||
| DPAA Ethernet Frame Processing | ||
| ============================== | ||
|
|
||
| On Rx, buffers for the incoming frames are retrieved from one of the three | ||
| existing buffers pools. The driver initializes and seeds these, each with | ||
| buffers of different sizes: 1KB, 2KB and 4KB. | ||
|
|
||
| On Tx, all transmitted frames are returned to the driver through Tx | ||
| confirmation frame queues. The driver is then responsible for freeing the | ||
| buffers. In order to do this properly, a backpointer is added to the buffer | ||
| before transmission that points to the skb. When the buffer returns to the | ||
| driver on a confirmation FQ, the skb can be correctly consumed. | ||
|
|
||
| DPAA Ethernet Features | ||
| ====================== | ||
|
|
||
| Currently the DPAA Ethernet driver enables the basic features required for | ||
| a Linux Ethernet driver. The support for advanced features will be added | ||
| gradually. | ||
|
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| The driver has Rx and Tx checksum offloading for UDP and TCP. Currently the Rx | ||
| checksum offload feature is enabled by default and cannot be controlled through | ||
| ethtool. | ||
|
|
||
| The driver has support for multiple prioritized Tx traffic classes. Priorities | ||
| range from 0 (lowest) to 3 (highest). These are mapped to HW workqueues with | ||
| strict priority levels. Each traffic class contains NR_CPU TX queues. By | ||
| default, only one traffic class is enabled and the lowest priority Tx queues | ||
| are used. Higher priority traffic classes can be enabled with the mqprio | ||
| qdisc. For example, all four traffic classes are enabled on an interface with | ||
| the following command. Furthermore, skb priority levels are mapped to traffic | ||
| classes as follows: | ||
|
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||
| * priorities 0 to 3 - traffic class 0 (low priority) | ||
| * priorities 4 to 7 - traffic class 1 (medium-low priority) | ||
| * priorities 8 to 11 - traffic class 2 (medium-high priority) | ||
| * priorities 12 to 15 - traffic class 3 (high priority) | ||
|
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| tc qdisc add dev <int> root handle 1: \ | ||
| mqprio num_tc 4 map 0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3 hw 1 | ||
|
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| Debugging | ||
| ========= | ||
|
|
||
| The following statistics are exported for each interface through ethtool: | ||
|
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||
| - interrupt count per CPU | ||
| - Rx packets count per CPU | ||
| - Tx packets count per CPU | ||
| - Tx confirmed packets count per CPU | ||
| - Tx S/G frames count per CPU | ||
| - Tx error count per CPU | ||
| - Rx error count per CPU | ||
| - Rx error count per type | ||
| - congestion related statistics: | ||
| - congestion status | ||
| - time spent in congestion | ||
| - number of time the device entered congestion | ||
| - dropped packets count per cause | ||
|
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| The driver also exports the following information in sysfs: | ||
|
|
||
| - the FQ IDs for each FQ type | ||
| /sys/devices/platform/dpaa-ethernet.0/net/<int>/fqids | ||
|
|
||
| - the IDs of the buffer pools in use | ||
| /sys/devices/platform/dpaa-ethernet.0/net/<int>/bpids |
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