linux DSA 开发上手笔记(一)

与 DSA 相关的代码

./net/dsa/*
./drivers/net/dsa/*

./net/dsa/Kconfig

# net/dsa/Kconfig 里面主要定义了以下CONFIG选项
NET_DSA
NET_DSA_TAG_8021Q
NET_DSA_TAG_xxx

./net/dsa/Makefile

# SPDX-License-Identifier: GPL-2.0
# the core
obj-$(CONFIG_NET_DSA) += dsa_core.o
dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o# tagging formats
obj-$(CONFIG_NET_DSA_TAG_8021Q) += tag_8021q.o
obj-$(CONFIG_NET_DSA_TAG_BRCM_COMMON) += tag_brcm.o
obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o
obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o

由此可见核心代码是：

obj-$(CONFIG_NET_DSA) += dsa_core.o
dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o

./drivers/net/dsa/Makefile

# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_NET_DSA_BCM_SF2)   += bcm-sf2.o
bcm-sf2-objs            := bcm_sf2.o bcm_sf2_cfp.o
obj-$(CONFIG_NET_DSA_LOOP)  += dsa_loop.o
ifdef CONFIG_NET_DSA_LOOP
obj-$(CONFIG_FIXED_PHY)     += dsa_loop_bdinfo.o
endif
obj-$(CONFIG_NET_DSA_LANTIQ_GSWIP) += lantiq_gswip.o
obj-$(CONFIG_NET_DSA_MT7530)    += mt7530.o
obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o
obj-$(CONFIG_NET_DSA_QCA8K) += qca8k.o
obj-$(CONFIG_NET_DSA_REALTEK_SMI) += realtek-smi.o
realtek-smi-objs        := realtek-smi-core.o rtl8366.o rtl8366rb.o
obj-$(CONFIG_NET_DSA_SMSC_LAN9303) += lan9303-core.o
obj-$(CONFIG_NET_DSA_SMSC_LAN9303_I2C) += lan9303_i2c.o
obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX) += vitesse-vsc73xx-core.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_PLATFORM) += vitesse-vsc73xx-platform.o
obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_SPI) += vitesse-vsc73xx-spi.o
obj-y               += b53/
obj-y               += microchip/
obj-y               += mv88e6xxx/
obj-y               += sja1105/# 这里是不同厂家switch 驱动

以 mt7530.c 为例，学习 dsa switch 驱动的写法

static struct mdio_driver mt7530_mdio_driver = {.probe  = mt7530_probe,.remove = mt7530_remove,.mdiodrv.driver = {.name = "mt7530",.of_match_table = mt7530_of_match,},
};mdio_module_driver(mt7530_mdio_driver);

要点：是用 mdio_module_driver

/*** mdio_module_driver() - Helper macro for registering mdio drivers** Helper macro for MDIO drivers which do not do anything special in module* init/exit. Each module may only use this macro once, and calling it* replaces module_init() and module_exit().*/
#define mdio_module_driver(_mdio_driver)                \
static int __init mdio_module_init(void)                \
{                                   \return mdio_driver_register(&_mdio_driver);            \
}                                   \
module_init(mdio_module_init);                      \
static void __exit mdio_module_exit(void)               \
{                                   \mdio_driver_unregister(&_mdio_driver);             \
}                                   \
module_exit(mdio_module_exit)

mt7530_probe

static int
mt7530_probe(struct mdio_device *mdiodev)
{//...priv->bus = mdiodev->bus;priv->dev = &mdiodev->dev;priv->ds->priv = priv;priv->ds->ops = &mt7530_switch_ops;              //关键代码mutex_init(&priv->reg_mutex);dev_set_drvdata(&mdiodev->dev, priv);return dsa_register_switch(priv->ds);            //关键代码
}

关键在于 mt7530_switch_ops 和 dsa_register_switch

mt7530_switch_ops

static const struct dsa_switch_ops mt7530_switch_ops = {.get_tag_protocol   = mtk_get_tag_protocol,.setup          = mt7530_setup,.get_strings        = mt7530_get_strings,.phy_read     = mt7530_phy_read,.phy_write       = mt7530_phy_write,.get_ethtool_stats  = mt7530_get_ethtool_stats,.get_sset_count     = mt7530_get_sset_count,.port_enable       = mt7530_port_enable,.port_disable     = mt7530_port_disable,.port_stp_state_set  = mt7530_stp_state_set,.port_bridge_join   = mt7530_port_bridge_join,.port_bridge_leave   = mt7530_port_bridge_leave,.port_fdb_add       = mt7530_port_fdb_add,.port_fdb_del        = mt7530_port_fdb_del,.port_fdb_dump       = mt7530_port_fdb_dump,.port_vlan_filtering    = mt7530_port_vlan_filtering,.port_vlan_prepare    = mt7530_port_vlan_prepare,.port_vlan_add      = mt7530_port_vlan_add,.port_vlan_del      = mt7530_port_vlan_del,.phylink_validate   = mt7530_phylink_validate,.phylink_mac_link_state = mt7530_phylink_mac_link_state,.phylink_mac_config = mt7530_phylink_mac_config,.phylink_mac_link_down = mt7530_phylink_mac_link_down,.phylink_mac_link_up    = mt7530_phylink_mac_link_up,
};

定义了一些关键函数。

小结：

dsa switch 驱动本身是 mdio 设备驱动
dsa switch 驱动的核心是实现 struct dsa_switch_ops 结构体

dts 写法

&eth {status = "okay";gmac0: mac@0 {compatible = "mediatek,eth-mac";reg = <0>;phy-mode = "trgmii";fixed-link {speed = <1000>;full-duplex;pause;};};mdio: mdio-bus {#address-cells = <1>;#size-cells = <0>;switch@0 {compatible = "mediatek,mt7530";reg = <0>;reset-gpios = <&pio 33 0>;core-supply = <&mt6323_vpa_reg>;io-supply = <&mt6323_vemc3v3_reg>;ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;label = "wan";};port@1 {reg = <1>;label = "lan0";};port@2 {reg = <2>;label = "lan1";};port@3 {reg = <3>;label = "lan2";};port@4 {reg = <4>;label = "lan3";};port@6 {reg = <6>;label = "cpu";ethernet = <&gmac0>;phy-mode = "trgmii";fixed-link {speed = <1000>;full-duplex;pause;};};};};};
};

详见：Documentation/devicetree/bindings/net/dsa/dsa.txt

dsa switch 驱动的骨架

static const struct dsa_switch_ops mt7530_switch_ops = {};static const struct of_device_id mt7530_of_match[] = {{ .compatible = "mediatek,mt7621", .data = (void *)ID_MT7621, },{ .compatible = "mediatek,mt7530", .data = (void *)ID_MT7530, },{ /* sentinel */ },
};MODULE_DEVICE_TABLE(of, mt7530_of_match);
static int
mt7530_probe(struct mdio_device *mdiodev)
{}static void
mt7530_remove(struct mdio_device *mdiodev)
{}static struct mdio_driver mt7530_mdio_driver = {.probe  = mt7530_probe,.remove = mt7530_remove,.mdiodrv.driver = {.name = "mt7530",.of_match_table = mt7530_of_match,},
};mdio_module_driver(mt7530_mdio_driver);MODULE_LICENSE("GPL");

linux DSA 开发上手笔记(一)相关推荐

linux DSA 开发（一）
linux DSA 开发(一) 本文主要是翻译,原文链接如下:https://www.kernel.org/doc/html/latest/networking/dsa/dsa.html 纲要本文档 ...
Linux驱动开发学习笔记【12】：Linux自带LED灯驱动
目录一.内核自带LED驱动使能二.内核自带LED驱动分析三.内核自带LED驱动使用一.内核自带LED驱动使能在Linux内核中,已经自带了LED灯的驱动程序,使用的就是platform平台驱 ...
linux平台开发自学笔记（三）-代码编译
linux和window编代码其实大致上是差不多的,不过在一些概念上还有差别,比如使用的库不一样,编译工具不一样,shell不一样,库的链接方式也不一样,这里做个简要的总结 1.库 window上有两 ...
正点原子 Linux驱动开发学习笔记-06 chrdevbase虚拟设备驱动的完善
要求:应用程序可以对驱动进行读写操作. 读:从驱动读一个字符串写:应用程序向驱动写一个字符串驱动的缓冲,与应用程序的读写buffer都是100. 1. read驱动函数编写,需要用到copy_to ...
Linux驱动开发学习笔记【8】：Linux中断系统
目录一.Linux内核中断处理过程 1.1.裸机中断 1.2.linux中断二.linux中断的上半部和下半部 2.1 软中断 2.2 tasklet 2.3 工作队列 2.4 中断线程化三.设 ...
Linux驱动开发学习笔记-电容触摸屏驱动
<电容触摸屏驱动框架> 电容触摸屏驱动其实是以下几种 linux 驱动框架的组合: ① IIC 设备驱动,因为电容触摸 IC 基本都是 IIC 接口的,因此大框架就是 IIC 设备驱动. ...
linux驱动开发学习笔记二十一：异步通知
一.异步通知简介我们首先来回顾一下"中断",中断是处理器提供的一种异步机制,我们配置好中断以后就可以让处理器去处理其他的事情了,当中断发生以后会触发我们事先设置好的中断服务函数, ...
LINUX驱动开发学习笔记--DDR3内存
在学习DDR之前,我们首先要知道什么是RAM和ROM RAM:随机存储器,可以随时进行读写操作,速度很快,掉电以后数据会丢失.比如内存条. SRAM. SDRAM. DDR等都是 RAM. RAM一般 ...
Vue快速上手笔记2 - 开发环境的搭建
Vue快速上手笔记2 - 开发环境的搭建 CSDN:JcLee95 邮箱:291148484@163.com 专题目录:https://blog.csdn.net/qq_28550263/articl ...
linux 内核模块开发,Linux内核模块开发(笔记)
Linux内核模块开发(笔记) 作者:扶凯来源: 扶凯时间:2011-11-21 00:21:11 人气:249 评论:0 标签: 内核个人笔记..在不放过来都快找不到了.有空还得好好整理一下了 ...

linux DSA 开发上手笔记(一)

linux DSA 开发上手笔记(一)

与 DSA 相关的代码

以 mt7530.c 为例，学习 dsa switch 驱动的写法

mt7530_probe

mt7530_switch_ops

dts 写法

dsa switch 驱动的骨架

linux DSA 开发上手笔记(一)相关推荐

最新文章

热门文章