[U-Boot] [PATCH 0/6] Introduce DSA Ethernet switch class and Felix driver
Vladimir Oltean
olteanv at gmail.com
Fri Nov 22 10:32:21 UTC 2019
On Fri, 22 Nov 2019 at 03:37, Alex Marginean
<alexandru.marginean at nxp.com> wrote:
>
> 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
>
> From the doc:
>
> Summarized, this is basically how DSA looks like from a network device
> perspective:
>
>
> |---------------------------
> | CPU network device (eth0)|
> ----------------------------
> | <tag added by switch |
> | |
> | |
> | tag added by CPU> |
> |--------------------------------------------|
> | Switch driver |
> |--------------------------------------------|
> || || ||
> |-------| |-------| |-------|
> | sw0p0 | | sw0p1 | | sw0p2 |
> |-------| |-------| |-------|
>
> This patch set introduces a DSA class in U-Boot to support drivers of such
> 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.
>
> 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/fom 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
>
> => tftp 80000000 test
> Using swp2 device
> TFTP from server 192.168.100.1; our IP address is 192.168.100.100
> Filename 'test'.
> Load address: 0x80000000
> Loading: #################################################################
> #################################################################
> ########################################################
> 6.8 MiB/s
> done
> Bytes transferred = 949880 (e7e78 hex)
>
>
>
> This patch set replaces this previous submission of the Felix driver:
> https://patchwork.ozlabs.org/project/uboot/list/?series=143126&state=*
> and depends on:
> https://patchwork.ozlabs.org/project/uboot/list/?series=142858
> https://patchwork.ozlabs.org/project/uboot/list/?series=142879
>
> Alex Marginean (6):
> net: introduce DSA class for Ethernet switches
> drivers: net: add a DSA sandbox driver
> test: dm: add a simple unit test for DSA class
> drivers: net: add Felix DSA switch driver
> arm: dts: ls1028a: adds Ethernet switch node and its dependencies
> configs: ls1028a: enable the Ethernet switch driver in defconfig
>
> arch/Kconfig | 1 +
> arch/arm/dts/fsl-ls1028a-rdb.dts | 36 ++
> arch/arm/dts/fsl-ls1028a.dtsi | 41 +-
> arch/sandbox/dts/test.dts | 49 ++
> configs/ls1028aqds_tfa_SECURE_BOOT_defconfig | 3 +-
> configs/ls1028aqds_tfa_defconfig | 3 +-
> configs/ls1028ardb_tfa_SECURE_BOOT_defconfig | 3 +-
> configs/ls1028ardb_tfa_defconfig | 3 +-
> drivers/net/Kconfig | 21 +
> drivers/net/Makefile | 1 +
> drivers/net/dsa_sandbox.c | 272 +++++++++++
> 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 | 453 +++++++++++++++++++
> include/configs/sandbox.h | 4 +
> include/dm/uclass-id.h | 1 +
> include/dsa.h | 132 ++++++
> net/Makefile | 1 +
> net/dsa-uclass.c | 369 +++++++++++++++
> test/dm/Makefile | 1 +
> test/dm/dsa.c | 58 +++
> test/dm/test-fdt.c | 2 +-
> 23 files changed, 1462 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/dsa.h
> create mode 100644 net/dsa-uclass.c
> create mode 100644 test/dm/dsa.c
>
> --
> 2.17.1
>
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CC:ing the Linux DSA maintainers, who are probably interested in this.
Thanks,
-Vladimir
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