DSA stands for Distributed Switch Architecture and it is a subsystem introduced in the Linux kernel to support switches that: - have an Ethernet link up to the CPU - use some form of tagging to identify the source/destination port for Rx/Tx - may be cascaded in tree-like structures.
DSA is described in depth here: https://www.kernel.org/doc/Documentation/networking/dsa/dsa.txt
This patch set introduces a DSA class in U-Boot to support drivers of DSA switches. DSA drivers have to implement the following ops: - enable/disable of switch ports, - insert a tag in frames being transmitted, used by the switch to select the egress port, - parse a tag in frames being received, used for Rx traffic.
DSA class code deals with presentation of switch ports as Ethernet interfaces, deals with the master Ethernet device for I/O and helps with parsing of the DT assuming the structure follows the DSA kernel binding.
Support for switch cascading is not included yet.
In the sandbox environment, the DSA sandbox driver, the switch ports and master eth interface look like this: => dm tree Class Index Probed Driver Name ----------------------------------------------------------- [...] eth 4 [ + ] eth_sandbox |-- dsa-test-eth dsa 0 [ + ] dsa_sandbox |-- dsa-test eth 5 [ + ] dsa-port | |-- lan0 eth 6 [ + ] dsa-port | `-- lan1
=> setenv ethact lan1 => ping 1.2.3.5 Using lan1 device host 1.2.3.5 is alive =>
This patch set also introduces a driver for the Ethernet switch integrated into NXP LS1028A, called Felix. The switch has 4 front panel ports, I/O to/from it is done though an ENETC Ethernet interface and meta-data is carried between the switch and the driver though an additional header pre-pended to the original frame. Network commands like tftp can be used on these front panel ports. The ports are disabled unless used so they do not cause issues on network topologies that include loops.
Felix as seen on LS1028A RDB: => dm tree Class Index Probed Driver Name ----------------------------------------------------------- [...] dsa 0 [ + ] felix-switch | |-- felix-switch eth 4 [ + ] dsa-port | | |-- swp0 eth 5 [ + ] dsa-port | | |-- swp1 eth 6 [ + ] dsa-port | | |-- swp2 eth 7 [ + ] dsa-port | | `-- swp3
=> mdio list [...] 10 - Vitesse VSC8514 <--> swp0 11 - Vitesse VSC8514 <--> swp1 12 - Vitesse VSC8514 <--> swp2 13 - Vitesse VSC8514 <--> swp3
NOTE: This patchset is a major rework of the dsa-class code since the last submission from May 5th: https://patchwork.ozlabs.org/project/uboot/cover/1588700588-8587-1-git-send-... The basic concepts and data path operation (tagging) in the DSA class code remain the same as in the initial patchset from Alex, however the external API has been changed significantly (simplified), the driver model integration has been improved to the point that the DSA class code no longer needs to allocate extra memory internally (via malloc), reduced memory footprint, internal state data moved from the external API and internalized, cleaner external API, internal code reworked, completely reworked DSA sandbox driver and unit tests for better coverage and to integrate better with the eth sandbox driver and tests, etc. The DSA class code is now ported on top of the latest u-boot master branch (obviously), and I tested it thoroughly with the sandbox driver and unit tests. The felix driver has been tested with an older uboot, since there are some issues booting the latest upstream uboot on a LS1028A RDB board. Note that the felix driver itself didn't change since the last submission, except for the DSA API function calls.
v2: Switch node structure defined in dtsi now consistent with the Linux switch node definition. Moved aliases from dtsi to the RDB dts to minimize impact on other boards (and for improved flexibility).
Alex Marginean (3): drivers: net: Add Felix DSA switch driver arm: dts: ls1028a: Add Ethernet switch node and dependencies configs: ls1028a: Enable the Ethernet switch driver in defconfig
Claudiu Manoil (2): net: Introduce DSA class for Ethernet switches sandbox: Add a DSA sandbox driver and unit test
arch/Kconfig | 1 + arch/arm/dts/fsl-ls1028a-rdb.dts | 63 +++ arch/arm/dts/fsl-ls1028a.dtsi | 56 +- arch/sandbox/dts/test.dts | 40 ++ configs/ls1028aqds_tfa_SECURE_BOOT_defconfig | 2 + configs/ls1028aqds_tfa_defconfig | 2 + configs/ls1028ardb_tfa_SECURE_BOOT_defconfig | 2 + configs/ls1028ardb_tfa_defconfig | 2 + drivers/net/Kconfig | 23 + drivers/net/Makefile | 1 + drivers/net/dsa_sandbox.c | 181 +++++++ drivers/net/fsl_enetc.h | 5 + drivers/net/mscc_eswitch/Kconfig | 8 + drivers/net/mscc_eswitch/Makefile | 1 + drivers/net/mscc_eswitch/felix_switch.c | 432 ++++++++++++++++ include/configs/sandbox.h | 2 + include/dm/uclass-id.h | 1 + include/net.h | 6 + include/net/dsa.h | 206 ++++++++ net/Makefile | 1 + net/dsa-uclass.c | 517 +++++++++++++++++++ test/dm/Makefile | 1 + test/dm/dsa.c | 91 ++++ test/dm/eth.c | 10 +- 24 files changed, 1648 insertions(+), 6 deletions(-) create mode 100644 drivers/net/dsa_sandbox.c create mode 100644 drivers/net/mscc_eswitch/felix_switch.c create mode 100644 include/net/dsa.h create mode 100644 net/dsa-uclass.c create mode 100644 test/dm/dsa.c