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Message-ID: <d789fce6-9911-a602-83ca-eb7cb9bcd48b@ti.com>
Date: Thu, 19 Mar 2020 15:11:55 +0200
From: Peter Ujfalusi <peter.ujfalusi@...com>
To: Grygorii Strashko <grygorii.strashko@...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
Hi Grygorii,
On 19/03/2020 15.09, Grygorii Strashko wrote:
>
>
> 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
Thank you!
Probably drop the ti- prefix as well from the filename as it is under a
ti directory?
>>
>>> 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.
OK, fair enough.
- Péter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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