【无标题】ethtool程序，从用户态调用内核态调用分析

1. 说明

• 用户层ethtool使用的是： ethtool-6.5 为例，下载来自：
  https://mirrors.edge.kernel.org/pub/software/network/ethtool/

• 内核层：在内核源码中，VSCode -->【ctrl+p】搜索文件：linux/ethtool.h及 core/ethtool.c，相关实现在这两个文件中。

2. 应用层 ethtool-6.5

• ethtool.c
  下面的 args 结构体展示了成员的选项（.opts）、执行函数（.func）、netlink执行函数（.nlfunc，暂时不必关心）、帮助（.xhelp）。
  通过他们，能看出ethtool命令行后面跟什么选项时，调用了什么函数！

// 
static const struct option args[] = {
	{
		/* "default" entry when no switch is used */
		.opts	= "",
		.func	= do_gset,
		.nlfunc	= nl_gset,
		.help	= "Display standard information about device",
	},
	{
		.opts	= "-s|--change",
		.func	= do_sset,
		.nlfunc	= nl_sset,
		.help	= "Change generic options",
		.xhelp	= "		[ speed %d ]\n"
			  "		[ lanes %d ]\n"
			  "		[ duplex half|full ]\n"
			  "		[ port tp|aui|bnc|mii|fibre|da ]\n"
			  "		[ mdix auto|on|off ]\n"
			  "		[ autoneg on|off ]\n"
			  "		[ advertise %x[/%x] | mode on|off ... [--] ]\n"
			  "		[ phyad %d ]\n"
			  "		[ xcvr internal|external ]\n"
			  "		[ wol %d[/%d] | p|u|m|b|a|g|s|f|d... ]\n"
			  "		[ sopass %x:%x:%x:%x:%x:%x ]\n"
			  "		[ msglvl %d[/%d] | type on|off ... [--] ]\n"
			  "		[ master-slave preferred-master|preferred-slave|forced-master|forced-slave ]\n"
	},
	{
		.opts	= "-a|--show-pause",
		.json	= true,
		.func	= do_gpause,
		.nlfunc	= nl_gpause,
		.help	= "Show pause options",
		.xhelp	= "		[ --src aggregate | emac | pmac ]\n"
	},
	{
		.opts	= "-A|--pause",
		.func	= do_spause,
		.nlfunc	= nl_spause,
		.help	= "Set pause options",
		.xhelp	= "		[ autoneg on|off ]\n"
			  "		[ rx on|off ]\n"
			  "		[ tx on|off ]\n"
	},
	{
		.opts	= "-c|--show-coalesce",
		.json	= true,
		.func	= do_gcoalesce,
		.nlfunc	= nl_gcoalesce,
		.help	= "Show coalesce options"
	},
	{
		.opts	= "-C|--coalesce",
		.func	= do_scoalesce,
		.nlfunc	= nl_scoalesce,
		.help	= "Set coalesce options",
		.xhelp	= "		[adaptive-rx on|off]\n"
			  "		[adaptive-tx on|off]\n"
			  "		[rx-usecs N]\n"
			  "		[rx-frames N]\n"
			  "		[rx-usecs-irq N]\n"
			  "		[rx-frames-irq N]\n"
			  "		[tx-usecs N]\n"
			  "		[tx-frames N]\n"
			  "		[tx-usecs-irq N]\n"
			  "		[tx-frames-irq N]\n"
			  "		[stats-block-usecs N]\n"
			  "		[pkt-rate-low N]\n"
			  "		[rx-usecs-low N]\n"
			  "		[rx-frames-low N]\n"
			  "		[tx-usecs-low N]\n"
			  "		[tx-frames-low N]\n"
			  "		[pkt-rate-high N]\n"
			  "		[rx-usecs-high N]\n"
			  "		[rx-frames-high N]\n"
			  "		[tx-usecs-high N]\n"
			  "		[tx-frames-high N]\n"
			  "		[sample-interval N]\n"
			  "		[cqe-mode-rx on|off]\n"
			  "		[cqe-mode-tx on|off]\n"
			  "		[tx-aggr-max-bytes N]\n"
			  "		[tx-aggr-max-frames N]\n"
			  "		[tx-aggr-time-usecs N]\n"
	},
	{
		.opts	= "-g|--show-ring",
		.json	= true,
		.func	= do_gring,
		.nlfunc	= nl_gring,
		.help	= "Query RX/TX ring parameters"
	},
	{
		.opts	= "-G|--set-ring",
		.func	= do_sring,
		.nlfunc	= nl_sring,
		.help	= "Set RX/TX ring parameters",
		.xhelp	= "		[ rx N ]\n"
			  "		[ rx-mini N ]\n"
			  "		[ rx-jumbo N ]\n"
			  "		[ tx N ]\n"
			  "		[ rx-buf-len N ]\n"
			  "		[ cqe-size N ]\n"
			  "		[ tx-push on|off ]\n"
			  "		[ rx-push on|off ]\n"
			  "		[ tx-push-buf-len N]\n"
	},
	{
		.opts	= "-k|--show-features|--show-offload",
		.json	= true,
		.func	= do_gfeatures,
		.nlfunc	= nl_gfeatures,
		.help	= "Get state of protocol offload and other features"
	},
	{
		.opts	= "-K|--features|--offload",
		.func	= do_sfeatures,
		.nlfunc	= nl_sfeatures,
		.help	= "Set protocol offload and other features",
		.xhelp	= "		FEATURE on|off ...\n"
	},
	{
		.opts	= "-i|--driver",
		.func	= do_gdrv,
		.help	= "Show driver information"
	},
	{
		.opts	= "-d|--register-dump",
		.func	= do_gregs,
		.help	= "Do a register dump",
		.xhelp	= "		[ raw on|off ]\n"
			  "		[ file FILENAME ]\n"
	},
	{
		.opts	= "-e|--eeprom-dump",
		.func	= do_geeprom,
		.help	= "Do a EEPROM dump",
		.xhelp	= "		[ raw on|off ]\n"
			  "		[ offset N ]\n"
			  "		[ length N ]\n"
	},
	{
		.opts	= "-E|--change-eeprom",
		.func	= do_seeprom,
		.help	= "Change bytes in device EEPROM",
		.xhelp	= "		[ magic N ]\n"
			  "		[ offset N ]\n"
			  "		[ length N ]\n"
			  "		[ value N ]\n"
	},
	{
		.opts	= "-r|--negotiate",
		.func	= do_nway_rst,
		.help	= "Restart N-WAY negotiation"
	},
	{
		.opts	= "-p|--identify",
		.func	= do_phys_id,
		.help	= "Show visible port identification (e.g. blinking)",
		.xhelp	= "		[ TIME-IN-SECONDS ]\n"
	},
	{
		.opts	= "-t|--test",
		.func	= do_test,
		.help	= "Execute adapter self test",
		.xhelp	= "		[ online | offline | external_lb ]\n"
	},
	{
		.opts	= "-S|--statistics",
		.json	= true,
		.func	= do_gnicstats,
		.nlchk	= nl_gstats_chk,
		.nlfunc	= nl_gstats,
		.help	= "Show adapter statistics",
		.xhelp	= "		[ --all-groups | --groups [eth-phy] [eth-mac] [eth-ctrl] [rmon] ]\n"
			  "		[ --src aggregate | emac | pmac ]\n"
	},
	{
		.opts	= "--phy-statistics",
		.func	= do_gphystats,
		.help	= "Show phy statistics"
	},
	{
		.opts	= "-n|-u|--show-nfc|--show-ntuple",
		.func	= do_grxclass,
		.help	= "Show Rx network flow classification options or rules",
		.xhelp	= "		[ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|"
			  "tcp6|udp6|ah6|esp6|sctp6 [context %d] |\n"
			  "		  rule %d ]\n"
	},
	{
		.opts	= "-N|-U|--config-nfc|--config-ntuple",
		.func	= do_srxclass,
		.help	= "Configure Rx network flow classification options or rules",
		.xhelp	= "		rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|"
			  "tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r... [context %d] |\n"
			  "		flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4|"
			  "ip6|tcp6|udp6|ah6|esp6|sctp6\n"
			  "			[ src %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]\n"
			  "			[ dst %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]\n"
			  "			[ proto %d [m %x] ]\n"
			  "			[ src-ip IP-ADDRESS [m IP-ADDRESS] ]\n"
			  "			[ dst-ip IP-ADDRESS [m IP-ADDRESS] ]\n"
			  "			[ tos %d [m %x] ]\n"
			  "			[ tclass %d [m %x] ]\n"
			  "			[ l4proto %d [m %x] ]\n"
			  "			[ src-port %d [m %x] ]\n"
			  "			[ dst-port %d [m %x] ]\n"
			  "			[ spi %d [m %x] ]\n"
			  "			[ vlan-etype %x [m %x] ]\n"
			  "			[ vlan %x [m %x] ]\n"
			  "			[ user-def %x [m %x] ]\n"
			  "			[ dst-mac %x:%x:%x:%x:%x:%x [m %x:%x:%x:%x:%x:%x] ]\n"
			  "			[ action %d ] | [ vf %d queue %d ]\n"
			  "			[ context %d ]\n"
			  "			[ loc %d ] |\n"
			  "		delete %d\n"
	},
	{
		.opts	= "-T|--show-time-stamping",
		.func	= do_tsinfo,
		.nlfunc	= nl_tsinfo,
		.help	= "Show time stamping capabilities"
	},
	{
		.opts	= "-x|--show-rxfh-indir|--show-rxfh",
		.json	= true,
		.func	= do_grxfh,
		.nlfunc	= nl_grss,
		.help	= "Show Rx flow hash indirection table and/or RSS hash key",
		.xhelp	= "		[ context %d ]\n"
	},
	{
		.opts	= "-X|--set-rxfh-indir|--rxfh",
		.func	= do_srxfh,
		.help	= "Set Rx flow hash indirection table and/or RSS hash key",
		.xhelp	= "		[ context %d|new ]\n"
			  "		[ equal N | weight W0 W1 ... | default ]\n"
			  "		[ hkey %x:%x:%x:%x:%x:.... ]\n"
			  "		[ hfunc FUNC ]\n"
			  "		[ delete ]\n"
	},
	{
		.opts	= "-f|--flash",
		.func	= do_flash,
		.help	= "Flash firmware image from the specified file to a region on the device",
		.xhelp	= "		FILENAME [ REGION-NUMBER-TO-FLASH ]\n"
	},
	{
		.opts	= "-P|--show-permaddr",
		.func	= do_permaddr,
		.nlfunc	= nl_permaddr,
		.help	= "Show permanent hardware address"
	},
	{
		.opts	= "-w|--get-dump",
		.func	= do_getfwdump,
		.help	= "Get dump flag, data",
		.xhelp	= "		[ data FILENAME ]\n"
	},
	{
		.opts	= "-W|--set-dump",
		.func	= do_setfwdump,
		.help	= "Set dump flag of the device",
		.xhelp	= "		N\n"
	},
	{
		.opts	= "-l|--show-channels",
		.func	= do_gchannels,
		.nlfunc	= nl_gchannels,
		.help	= "Query Channels"
	},
	{
		.opts	= "-L|--set-channels",
		.func	= do_schannels,
		.nlfunc	= nl_schannels,
		.help	= "Set Channels",
		.xhelp	= "		[ rx N ]\n"
			  "		[ tx N ]\n"
			  "		[ other N ]\n"
			  "		[ combined N ]\n"
	},
	{
		.opts	= "--show-priv-flags",
		.func	= do_gprivflags,
		.nlfunc	= nl_gprivflags,
		.help	= "Query private flags"
	},
	{
		.opts	= "--set-priv-flags",
		.func	= do_sprivflags,
		.nlfunc	= nl_sprivflags,
		.help	= "Set private flags",
		.xhelp	= "		FLAG on|off ...\n"
	},
	{
		.opts	= "-m|--dump-module-eeprom|--module-info",
		.func	= do_getmodule,
		.nlfunc = nl_getmodule,
		.help	= "Query/Decode Module EEPROM information and optical diagnostics if available",
		.xhelp	= "		[ raw on|off ]\n"
			  "		[ hex on|off ]\n"
			  "		[ offset N ]\n"
			  "		[ length N ]\n"
			  "		[ page N ]\n"
			  "		[ bank N ]\n"
			  "		[ i2c N ]\n"
	},
	{
		.opts	= "--show-eee",
		.func	= do_geee,
		.nlfunc	= nl_geee,
		.help	= "Show EEE settings",
	},
	{
		.opts	= "--set-eee",
		.func	= do_seee,
		.nlfunc	= nl_seee,
		.help	= "Set EEE settings",
		.xhelp	= "		[ eee on|off ]\n"
			  "		[ advertise %x ]\n"
			  "		[ tx-lpi on|off ]\n"
			  "		[ tx-timer %d ]\n"
	},
	{
		.opts	= "--set-phy-tunable",
		.func	= do_set_phy_tunable,
		.help	= "Set PHY tunable",
		.xhelp	= "		[ downshift on|off [count N] ]\n"
			  "		[ fast-link-down on|off [msecs N] ]\n"
			  "		[ energy-detect-power-down on|off [msecs N] ]\n"
	},
	{
		.opts	= "--get-phy-tunable",
		.func	= do_get_phy_tunable,
		.help	= "Get PHY tunable",
		.xhelp	= "		[ downshift ]\n"
			  "		[ fast-link-down ]\n"
			  "		[ energy-detect-power-down ]\n"
	},
	{
		.opts	= "--get-tunable",
		.func	= do_gtunable,
		.help	= "Get tunable",
		.xhelp	= "		[ rx-copybreak ]\n"
			  "		[ tx-copybreak ]\n"
			  "		[ tx-buf-size ]\n"
			  "		[ pfc-prevention-tout ]\n"
	},
	{
		.opts	= "--set-tunable",
		.func	= do_stunable,
		.help	= "Set tunable",
		.xhelp	= "		[ rx-copybreak N ]\n"
			  "		[ tx-copybreak N ]\n"
			  "		[ tx-buf-size N ]\n"
			  "		[ pfc-prevention-tout N ]\n"
	},
	{
		.opts	= "--reset",
		.func	= do_reset,
		.help	= "Reset components",
		.xhelp	= "		[ flags %x ]\n"
			  "		[ mgmt ]\n"
			  "		[ mgmt-shared ]\n"
			  "		[ irq ]\n"
			  "		[ irq-shared ]\n"
			  "		[ dma ]\n"
			  "		[ dma-shared ]\n"
			  "		[ filter ]\n"
			  "		[ filter-shared ]\n"
			  "		[ offload ]\n"
			  "		[ offload-shared ]\n"
			  "		[ mac ]\n"
			  "		[ mac-shared ]\n"
			  "		[ phy ]\n"
			  "		[ phy-shared ]\n"
			  "		[ ram ]\n"
			  "		[ ram-shared ]\n"
			  "		[ ap ]\n"
			  "		[ ap-shared ]\n"
			  "		[ dedicated ]\n"
			  "		[ all ]\n"
	},
	{
		.opts	= "--show-fec",
		.json	= true,
		.func	= do_gfec,
		.nlfunc	= nl_gfec,
		.help	= "Show FEC settings",
	},
	{
		.opts	= "--set-fec",
		.func	= do_sfec,
		.nlfunc	= nl_sfec,
		.help	= "Set FEC settings",
		.xhelp	= "		[ encoding auto|off|rs|baser|llrs [...] ]\n"
	},
	{
		.opts	= "-Q|--per-queue",
		.func	= do_perqueue,
		.help	= "Apply per-queue command. ",
		.xhelp	= "The supported sub commands include --show-coalesce, --coalesce"
			  "		[queue_mask %x] SUB_COMMAND\n",
	},
	{
		.opts	= "--cable-test",
		.json	= true,
		.nlfunc	= nl_cable_test,
		.help	= "Perform a cable test",
	},
	{
		.opts	= "--cable-test-tdr",
		.json	= true,
		.nlfunc	= nl_cable_test_tdr,
		.help	= "Print cable test time domain reflectrometery data",
		.xhelp	= "		[ first N ]\n"
			  "		[ last N ]\n"
			  "		[ step N ]\n"
			  "		[ pair N ]\n"
	},
	{
		.opts	= "--show-tunnels",
		.nlfunc	= nl_gtunnels,
		.help	= "Show NIC tunnel offload information",
	},
	{
		.opts	= "--show-module",
		.json	= true,
		.nlfunc	= nl_gmodule,
		.help	= "Show transceiver module settings",
	},
	{
		.opts	= "--set-module",
		.nlfunc	= nl_smodule,
		.help	= "Set transceiver module settings",
		.xhelp	= "		[ power-mode-policy high|auto ]\n"
	},
	{
		.opts	= "--get-plca-cfg",
		.nlfunc	= nl_plca_get_cfg,
		.help	= "Get PLCA configuration",
	},
	{
		.opts	= "--set-plca-cfg",
		.nlfunc	= nl_plca_set_cfg,
		.help	= "Set PLCA configuration",
		.xhelp  = "		[ enable on|off ]\n"
			  "		[ node-id N ]\n"
			  "		[ node-cnt N ]\n"
			  "		[ to-tmr N ]\n"
			  "		[ burst-cnt N ]\n"
			  "		[ burst-tmr N ]\n"
	},
	{
		.opts	= "--get-plca-status",
		.nlfunc	= nl_plca_get_status,
		.help	= "Get PLCA status information",
	},
	{
		.opts	= "--show-mm",
		.json	= true,
		.nlfunc	= nl_get_mm,
		.help	= "Show MAC merge layer state",
	},
	{
		.opts	= "--set-mm",
		.nlfunc	= nl_set_mm,
		.help	= "Set MAC merge layer parameters",
			  "		[ verify-enabled on|off ]\n"
			  "		[ verify-time N ]\n"
			  "		[ tx-enabled on|off ]\n"
			  "		[ pmac-enabled on|off ]\n"
			  "		[ tx-min-frag-size 60-252 ]\n"
	},
	{
		.opts	= "--show-pse",
		.json	= true,
		.nlfunc	= nl_gpse,
		.help	= "Show settings for Power Sourcing Equipment",
	},
	{
		.opts	= "--set-pse",
		.nlfunc	= nl_spse,
		.help	= "Set Power Sourcing Equipment settings",
		.xhelp	= "		[ podl-pse-admin-control enable|disable ]\n"
	},
	{
		.opts	= "-h|--help",
		.no_dev	= true,
		.func	= show_usage,
		.help	= "Show this help"
	},
	{
		.opts	= "--version",
		.no_dev	= true,
		.func	= do_version,
		.help	= "Show version number"
	},
	{}
};


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读操作

这里以 .opts = “-i|–driver” 为例：读取网卡信息

#使用：ethtool -i ethX
do_gdrv
	--> send_ioctl(ETHTOOL_GDRVINFO)
		--> ioctl(SIOCETHTOOL);
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写操作

这里以 .opts = "-p|–identify"为例，设置网卡点灯时间

#使用：ethtool -p ethX 10
do_phys_id
	--> send_ioctl(ETHTOOL_PHYS_ID);
		--> ioctl(SIOCETHTOOL);
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应用层调用到 ioctl ，到此为止！

3. 内核层

继续上面示例，应用层 ioctl 继续调用内核层 dev_ioctl:

读操作：读取网卡信息

dev_ioctl case SIOCETHTOOL:-->
	--> dev_ethtool
		--> ethtool_get_drvinfo
			--> ops->get_drvinfo  #这个函数是 struct ethtool_ops 结构体中，需要自己实现

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写操作：设置网卡点灯时间

dev_ioctl case SIOCETHTOOL:-->
	--> dev_ethtool
		--> ethtool_phys_id
			--> ops->set_phys_id  #这个函数是 struct ethtool_ops 结构体中，需要自己实现

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struct ethtool_ops 内容(linux/ethtool.h)

struct ethtool_ops {
 {
	int	(*get_settings)(struct net_device *, struct ethtool_cmd *);
	int	(*set_settings)(struct net_device *, struct ethtool_cmd *);
	void	(*get_drvinfo)(struct net_device *, struct ethtool_drvinfo *);
	int	(*get_regs_len)(struct net_device *);
	void	(*get_regs)(struct net_device *, struct ethtool_regs *, void *);
	void	(*get_wol)(struct net_device *, struct ethtool_wolinfo *);
	int	(*set_wol)(struct net_device *, struct ethtool_wolinfo *);
	u32	(*get_msglevel)(struct net_device *);
	void	(*set_msglevel)(struct net_device *, u32);
	int	(*nway_reset)(struct net_device *);
	u32	(*get_link)(struct net_device *);
	int	(*get_eeprom_len)(struct net_device *);
	int	(*get_eeprom)(struct net_device *,
			      struct ethtool_eeprom *, u8 *);
	int	(*set_eeprom)(struct net_device *,
			      struct ethtool_eeprom *, u8 *);
	int	(*get_coalesce)(struct net_device *, struct ethtool_coalesce *);
	int	(*set_coalesce)(struct net_device *, struct ethtool_coalesce *);
	void	(*get_ringparam)(struct net_device *,
				 struct ethtool_ringparam *);
	int	(*set_ringparam)(struct net_device *,
				 struct ethtool_ringparam *);
	void	(*get_pauseparam)(struct net_device *,
				  struct ethtool_pauseparam*);
	int	(*set_pauseparam)(struct net_device *,
				  struct ethtool_pauseparam*);
	void	(*self_test)(struct net_device *, struct ethtool_test *, u64 *);
	void	(*get_strings)(struct net_device *, u32 stringset, u8 *);
	int	(*set_phys_id)(struct net_device *, enum ethtool_phys_id_state);
	void	(*get_ethtool_stats)(struct net_device *,
				     struct ethtool_stats *, u64 *);
	int	(*begin)(struct net_device *);
	void	(*complete)(struct net_device *);
	u32	(*get_priv_flags)(struct net_device *);
	int	(*set_priv_flags)(struct net_device *, u32);
	int	(*get_sset_count)(struct net_device *, int);
	int	(*get_rxnfc)(struct net_device *,
			     struct ethtool_rxnfc *, u32 *rule_locs);
	int	(*set_rxnfc)(struct net_device *, struct ethtool_rxnfc *);
	int	(*flash_device)(struct net_device *, struct ethtool_flash *);
	int	(*reset)(struct net_device *, u32 *);
	u32	(*get_rxfh_key_size)(struct net_device *);
	u32	(*get_rxfh_indir_size)(struct net_device *);
	int	(*get_rxfh)(struct net_device *, u32 *indir, u8 *key,
			    u8 *hfunc);
	int	(*set_rxfh)(struct net_device *, const u32 *indir,
			    const u8 *key, const u8 hfunc);
	void	(*get_channels)(struct net_device *, struct ethtool_channels *);
	int	(*set_channels)(struct net_device *, struct ethtool_channels *);
	int	(*get_dump_flag)(struct net_device *, struct ethtool_dump *);
	int	(*get_dump_data)(struct net_device *,
				 struct ethtool_dump *, void *);
	int	(*set_dump)(struct net_device *, struct ethtool_dump *);
	int	(*get_ts_info)(struct net_device *, struct ethtool_ts_info *);
	int     (*get_module_info)(struct net_device *,
				   struct ethtool_modinfo *);
	int     (*get_module_eeprom)(struct net_device *,
				     struct ethtool_eeprom *, u8 *);
	int	(*get_eee)(struct net_device *, struct ethtool_eee *);
	int	(*set_eee)(struct net_device *, struct ethtool_eee *);
	int	(*get_tunable)(struct net_device *,
			       const struct ethtool_tunable *, void *);
	int	(*set_tunable)(struct net_device *,
			       const struct ethtool_tunable *, const void *);


};
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ethtool_ops使用的典型参考：dm9000.c

在内核源码中，VScode–【ctrl+p】，输入 dm9000.c

static const struct ethtool_ops dm9000_ethtool_ops = {
	.get_drvinfo		= dm9000_get_drvinfo,
	.get_settings		= dm9000_get_settings,
	.set_settings		= dm9000_set_settings,
	.get_msglevel		= dm9000_get_msglevel,
	.set_msglevel		= dm9000_set_msglevel,
	.nway_reset		= dm9000_nway_reset,
	.get_link		= dm9000_get_link,
	.get_wol		= dm9000_get_wol,
	.set_wol		= dm9000_set_wol,
	.get_eeprom_len		= dm9000_get_eeprom_len,
	.get_eeprom		= dm9000_get_eeprom,
	.set_eeprom		= dm9000_set_eeprom,
};

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