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Date: Thu, 19 Mar 2020 15:09:59 +0200
From: Grygorii Strashko <grygorii.strashko@...com>
To: Peter Ujfalusi <peter.ujfalusi@...com>,
Rob Herring <robh+dt@...nel.org>,
Kishon Vijay Abraham I <kishon@...com>,
Tero Kristo <t-kristo@...com>,
"David S . Miller" <davem@...emloft.net>,
netdev <netdev@...r.kernel.org>, Roger Quadros <rogerq@...com>,
<devicetree@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>
CC: Murali Karicheri <m-karicheri2@...com>,
Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next v4 06/11] net: ethernet: ti: introduce
am65x/j721e gigabit eth subsystem driver
On 19/03/2020 13:46, Peter Ujfalusi wrote:
> Hi Grygorii,
>
> On 17/03/2020 9.27, Grygorii Strashko wrote:
>> The TI AM65x/J721E SoCs Gigabit Ethernet Switch subsystem (CPSW2G NUSS) has
>> two ports - One Ethernet port (port 1) with selectable RGMII and RMII
>> interfaces and an internal Communications Port Programming Interface (CPPI)
>> port (Host port 0) and with ALE in between. It also contains
>> - Management Data Input/Output (MDIO) interface for physical layer device
>> (PHY) management;
>> - Updated Address Lookup Engine (ALE) module;
>> - (TBD) New version of Common platform time sync (CPTS) module.
>>
>> On the TI am65x/J721E SoCs CPSW NUSS Ethernet subsystem into device MCU
>> domain named MCU_CPSW0.
>>
>> Host Port 0 CPPI Packet Streaming Interface interface supports 8 TX
>> channels and one RX channels operating by TI am654 NAVSS Unified DMA
>> Peripheral Root Complex (UDMA-P) controller.
>>
>> Introduced driver provides standard Linux net_device to user space and supports:
>> - ifconfig up/down
>> - MAC address configuration
>> - ethtool operation:
>> --driver
>> --change
>> --register-dump
>> --negotiate phy
>> --statistics
>> --set-eee phy
>> --show-ring
>> --show-channels
>> --set-channels
>> - net_device ioctl mii-control
>> - promisc mode
>>
>> - rx checksum offload for non-fragmented IPv4/IPv6 TCP/UDP packets.
>> The CPSW NUSS can verify IPv4/IPv6 TCP/UDP packets checksum and fills
>> csum information for each packet in psdata[2] word:
>> - BIT(16) CHECKSUM_ERROR - indicates csum error
>> - BIT(17) FRAGMENT - indicates fragmented packet
>> - BIT(18) TCP_UDP_N - Indicates TCP packet was detected
>> - BIT(19) IPV6_VALID, BIT(20) IPV4_VALID - indicates IPv6/IPv4 packet
>> - BIT(15, 0) CHECKSUM_ADD - This is the value that was summed
>> during the checksum computation. This value is FFFFh for non fragmented
>> IPV4/6 UDP/TCP packets with no checksum error.
>>
>> RX csum offload can be disabled:
>> ethtool -K <dev> rx-checksum on|off
>>
>> - tx checksum offload support for IPv4/IPv6 TCP/UDP packets (J721E only).
>> TX csum HW offload can be enabled/disabled:
>> ethtool -K <dev> tx-checksum-ip-generic on|off
>>
>> - multiq and switch between round robin/prio modes for cppi tx queues by
>> using Netdev private flag "p0-rx-ptype-rrobin" to switch between
>> Round Robin and Fixed priority modes:
>> # ethtool --show-priv-flags eth0
>> Private flags for eth0:
>> p0-rx-ptype-rrobin: on
>> # ethtool --set-priv-flags eth0 p0-rx-ptype-rrobin off
>>
>> Number of TX DMA channels can be changed using "ethtool -L eth0 tx <N>".
>>
>> - GRO support: the napi_gro_receive() and napi_complete_done() are used.
>>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>> drivers/net/ethernet/ti/Kconfig | 19 +-
>> drivers/net/ethernet/ti/Makefile | 3 +
>> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 747 +++++++
>> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 1965 +++++++++++++++++++
>> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 143 ++
>> drivers/net/ethernet/ti/k3-udma-desc-pool.c | 126 ++
>> drivers/net/ethernet/ti/k3-udma-desc-pool.h | 30 +
>
> I would rather loose the 'udma' from the name and API. It is more like
> CPPI5 descriptor pool than UDMA. UDMA is just happen to use CPPI5.
> Probably ti-cppi5-desc-pool?
ok. I'll update and re-send
>
>> 7 files changed, 3031 insertions(+), 2 deletions(-)
>> create mode 100644 drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> create mode 100644 drivers/net/ethernet/ti/am65-cpsw-nuss.c
>> create mode 100644 drivers/net/ethernet/ti/am65-cpsw-nuss.h
>> create mode 100644 drivers/net/ethernet/ti/k3-udma-desc-pool.c
>> create mode 100644 drivers/net/ethernet/ti/k3-udma-desc-pool.h
>
>> diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
>> index 8a6ca16eee3b..89cec778cf2d 100644
>> --- a/drivers/net/ethernet/ti/Kconfig
>> +++ b/drivers/net/ethernet/ti/Kconfig
>> @@ -6,7 +6,7 @@
>> config NET_VENDOR_TI
>> bool "Texas Instruments (TI) devices"
>> default y
>> - depends on PCI || EISA || AR7 || ARCH_DAVINCI || ARCH_OMAP2PLUS || ARCH_KEYSTONE
>> + depends on PCI || EISA || AR7 || ARCH_DAVINCI || ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3
>> ---help---
>> If you have a network (Ethernet) card belonging to this class, say Y.
>>
>> @@ -31,7 +31,7 @@ config TI_DAVINCI_EMAC
>>
>> config TI_DAVINCI_MDIO
>> tristate "TI DaVinci MDIO Support"
>> - depends on ARCH_DAVINCI || ARCH_OMAP2PLUS || ARCH_KEYSTONE || COMPILE_TEST
>> + depends on ARCH_DAVINCI || ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST
>> select PHYLIB
>> ---help---
>> This driver supports TI's DaVinci MDIO module.
>> @@ -95,6 +95,21 @@ config TI_CPTS_MOD
>> imply PTP_1588_CLOCK
>> default m
>>
>> +config TI_K3_AM65_CPSW_NUSS
>> + tristate "TI K3 AM654x/J721E CPSW Ethernet driver"
>> + depends on ARCH_K3 && OF && TI_K3_UDMA_GLUE_LAYER
>> + select TI_DAVINCI_MDIO
>> + imply PHY_TI_GMII_SEL
>> + help
>> + This driver supports TI K3 AM654/J721E CPSW2G Ethernet SubSystem.
>> + The two-port Gigabit Ethernet MAC (MCU_CPSW0) subsystem provides
>> + Ethernet packet communication for the device: One Ethernet port
>> + (port 1) with selectable RGMII and RMII interfaces and an internal
>> + Communications Port Programming Interface (CPPI) port (port 0).
>> +
>> + To compile this driver as a module, choose M here: the module
>> + will be called ti-am65-cpsw-nuss.
>> +
>> config TI_KEYSTONE_NETCP
>> tristate "TI Keystone NETCP Core Support"
>> select TI_DAVINCI_MDIO
>> diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
>> index ecf776ad8689..6362a9b0bb8a 100644
>> --- a/drivers/net/ethernet/ti/Makefile
>> +++ b/drivers/net/ethernet/ti/Makefile
>> @@ -23,3 +23,6 @@ obj-$(CONFIG_TI_KEYSTONE_NETCP) += keystone_netcp.o
>> keystone_netcp-y := netcp_core.o cpsw_ale.o
>> obj-$(CONFIG_TI_KEYSTONE_NETCP_ETHSS) += keystone_netcp_ethss.o
>> keystone_netcp_ethss-y := netcp_ethss.o netcp_sgmii.o netcp_xgbepcsr.o cpsw_ale.o
>> +
>> +obj-$(CONFIG_TI_K3_AM65_CPSW_NUSS) += ti-am65-cpsw-nuss.o
>> +ti-am65-cpsw-nuss-y := am65-cpsw-nuss.o cpsw_sl.o am65-cpsw-ethtool.o cpsw_ale.o k3-udma-desc-pool.o
>
> Would not be better to have the desc-pool (silent) Kconfig selectable?
> The not yet upstream icssg-prueth also needs the same desc-pool library
> as cpsw.
>
I'd prefer not to add new Kconfig options unless required.
This driver simply not work without it, so no Kconfig option for now.
--
Best regards,
grygorii
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