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主要分析一下驱动的主要框架#xff0c;必要地方细致分析下
文件位置#xff1a;
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c 从文件的最后看起#xff1a; module_pci_driver(stmmac_pci_driver);
stmmac_pci_driver结构体如下#xff0c;里面包含了id_…probe
主要分析一下驱动的主要框架必要地方细致分析下
文件位置
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c 从文件的最后看起 module_pci_driver(stmmac_pci_driver);
stmmac_pci_driver结构体如下里面包含了id_table、probe、remove。id_table里包含了支持设备的vender id、device id当扫描到支持的pcie设备时把venderid 和device id 和table里的id对比就调用probe函数
static struct pci_driver stmmac_pci_driver { .name STMMAC_RESOURCE_NAME,.id_table stmmac_id_table,.probe stmmac_pci_probe,.remove stmmac_pci_remove,.driver { .pm stmmac_pm_ops,},
};以下是stmmac_pci_probe函数的一些主要调用 主要执行了以下操作
为plat_stmmacenet_data分配了空间填充plat_stmmacenet_data使能pci填充plat_stmmacenet_data中一些网卡参数信息获取pci的base address调用stmmac_dvr_probe
接下来就进入到stmmac_dvr_probe函数在此函数中主要完成net_device结构体的分配和填充填充中最重要的是设置了net_device结构体中的netdev_ops最后使用register_netdev(ndev)注册到内核
stmmac_dvr_probe int stmmac_dvr_probe(struct device *device,struct plat_stmmacenet_data *plat_dat,struct stmmac_resources *res)
{struct net_device *ndev NULL;struct stmmac_priv *priv;u32 queue, maxq;int ret 0;ndev alloc_etherdev_mqs(sizeof(struct stmmac_priv),MTL_MAX_TX_QUEUES,MTL_MAX_RX_QUEUES);SET_NETDEV_DEV(ndev, device);/*对priv的填充*/priv netdev_priv(ndev);priv-device device;priv-dev ndev;//对ethtool的支持stmmac_set_ethtool_ops(ndev);priv-pause pause;priv-plat plat_dat;priv-ioaddr res-addr;priv-dev-base_addr (unsigned long)res-addr;priv-dev-irq res-irq;priv-wol_irq res-wol_irq;priv-lpi_irq res-lpi_irq;/***************/if (res-mac)memcpy(priv-dev-dev_addr, res-mac, ETH_ALEN);dev_set_drvdata(device, priv-dev);/* Verify driver arguments */stmmac_verify_args();/* Allocate workqueue */priv-wq create_singlethread_workqueue(stmmac_wq);if (!priv-wq) {dev_err(priv-device, failed to create workqueue\n);ret -ENOMEM;goto error_wq;}INIT_WORK(priv-service_task, stmmac_service_task);/* Override with kernel parameters if supplied XXX CRS XXX* this needs to have multiple instances*/if ((phyaddr 0) (phyaddr 31))priv-plat-phy_addr phyaddr;/* Init MAC and get the capabilities */ret stmmac_hw_init(priv);if (ret)goto error_hw_init;/* Configure real RX and TX queues */netif_set_real_num_rx_queues(ndev, priv-plat-rx_queues_to_use);netif_set_real_num_tx_queues(ndev, priv-plat-tx_queues_to_use);//设置网卡的opsndev-netdev_ops stmmac_netdev_ops;ndev-hw_features NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |NETIF_F_RXCSUM;ret stmmac_tc_init(priv, priv);if (!ret) {ndev-hw_features | NETIF_F_HW_TC;}if ((priv-plat-tso_en) (priv-dma_cap.tsoen)) {ndev-hw_features | NETIF_F_TSO | NETIF_F_TSO6;priv-tso true;dev_info(priv-device, TSO feature enabled\n);}ndev-features | ndev-hw_features | NETIF_F_HIGHDMA;ndev-watchdog_timeo msecs_to_jiffies(watchdog);
#ifdef STMMAC_VLAN_TAG_USED/* Both mac100 and gmac support receive VLAN tag detection */ndev-features | NETIF_F_HW_VLAN_CTAG_RX | NETIF_F_HW_VLAN_STAG_RX;
#endif
priv-msg_enable netif_msg_init(debug, default_msg_level);/* MTU range: 46 - hw-specific max */ndev-min_mtu ETH_ZLEN - ETH_HLEN;if ((priv-plat-enh_desc) || (priv-synopsys_id DWMAC_CORE_4_00))ndev-max_mtu JUMBO_LEN;else if (priv-plat-has_xgmac)ndev-max_mtu XGMAC_JUMBO_LEN;elsendev-max_mtu SKB_MAX_HEAD(NET_SKB_PAD NET_IP_ALIGN);/* Will not overwrite ndev-max_mtu if plat-maxmtu ndev-max_mtu* as well as plat-maxmtu ndev-min_mtu which is a invalid range.*/if ((priv-plat-maxmtu ndev-max_mtu) (priv-plat-maxmtu ndev-min_mtu))ndev-max_mtu priv-plat-maxmtu;else if (priv-plat-maxmtu ndev-min_mtu)dev_warn(priv-device,%s: warning: maxmtu having invalid value (%d)\n,__func__, priv-plat-maxmtu);if (flow_ctrl)priv-flow_ctrl FLOW_AUTO; /* RX/TX pause on *//* Setup channels NAPI */maxq max(priv-plat-rx_queues_to_use, priv-plat-tx_queues_to_use);for (queue 0; queue maxq; queue) {struct stmmac_channel *ch priv-channel[queue];ch-priv_data priv;ch-index queue;if (queue priv-plat-rx_queues_to_use)ch-has_rx true;if (queue priv-plat-tx_queues_to_use)ch-has_tx true;netif_napi_add(ndev, ch-napi, stmmac_napi_poll,NAPI_POLL_WEIGHT);}mutex_init(priv-lock);/*如果设置了plat-clk_csr那么CSR clock在运行中将会是固定不变的如果没有设置那么click会根据csr实际的时钟输入动态的设置*/if (!priv-plat-clk_csr)stmmac_clk_csr_set(priv);elsepriv-clk_csr priv-plat-clk_csr;//检查是否支持Physical Coding Sublayerstmmac_check_pcs_mode(priv);if (priv-hw-pcs ! STMMAC_PCS_RGMII priv-hw-pcs ! STMMAC_PCS_TBI priv-hw-pcs ! STMMAC_PCS_RTBI) {/* MDIO bus Registration */ret stmmac_mdio_register(ndev);if (ret 0) {dev_err(priv-device,%s: MDIO bus (id: %d) registration failed,__func__, priv-plat-bus_id);goto error_mdio_register;}}ret register_netdev(ndev);return ret;
error_netdev_register:if (priv-hw-pcs ! STMMAC_PCS_RGMII priv-hw-pcs ! STMMAC_PCS_TBI priv-hw-pcs ! STMMAC_PCS_RTBI)stmmac_mdio_unregister(ndev);
error_mdio_register:for (queue 0; queue maxq; queue) {struct stmmac_channel *ch priv-channel[queue];netif_napi_del(ch-napi);}
error_hw_init:destroy_workqueue(priv-wq);
error_wq:free_netdev(ndev);return ret;
}
EXPORT_SYMBOL_GPL(stmmac_dvr_probe);下面看看stmmac_hw_init(priv)这里有硬件相关的设置特别是设置了操作硬件的ops函数中主要调用了stmmac_hwif_init函数。
int stmmac_hwif_init(struct stmmac_priv *priv)
{bool needs_xgmac priv-plat-has_xgmac;bool needs_gmac4 priv-plat-has_gmac4;bool needs_gmac priv-plat-has_gmac;const struct stmmac_hwif_entry *entry;struct mac_device_info *mac;bool needs_setup true;int i, ret;u32 id;if (needs_gmac) {id stmmac_get_id(priv, GMAC_VERSION);} else if (needs_gmac4 || needs_xgmac) {id stmmac_get_id(priv, GMAC4_VERSION);} else {id 0;}/* Save ID for later use */priv-synopsys_id id;/* Lets assume some safe values first */priv-ptpaddr priv-ioaddr (needs_gmac4 ? PTP_GMAC4_OFFSET : PTP_GMAC3_X_OFFSET);priv-mmcaddr priv-ioaddr (needs_gmac4 ? MMC_GMAC4_OFFSET : MMC_GMAC3_X_OFFSET);/* Check for HW specific setup first */if (priv-plat-setup) {mac priv-plat-setup(priv);needs_setup false;} else {mac devm_kzalloc(priv-device, sizeof(*mac), GFP_KERNEL);}if (!mac)return -ENOMEM;/* 为网卡设置硬件操作相关的回调函数*/for (i ARRAY_SIZE(stmmac_hw) - 1; i 0; i--) {/*在stmmac_hw数组中选取一个entry*/entry stmmac_hw[i];/*进行筛选*/if (needs_gmac ^ entry-gmac)continue;if (needs_gmac4 ^ entry-gmac4)continue;if (needs_xgmac ^ entry-xgmac)continue;/* Use synopsys_id var because some setups can override this */if (priv-synopsys_id entry-min_id)continue;/* 到这里表示已经选到合适的entry将它保存到mac结构体 */mac-desc mac-desc ? : entry-desc;mac-dma mac-dma ? : entry-dma;mac-mac mac-mac ? : entry-mac;mac-ptp mac-ptp ? : entry-hwtimestamp;mac-mode mac-mode ? : entry-mode;mac-tc mac-tc ? : entry-tc;/*把mac挂接到priv-hw*/priv-hw mac;priv-ptpaddr priv-ioaddr entry-regs.ptp_off;priv-mmcaddr priv-ioaddr entry-regs.mmc_off;/* Save quirks, if needed for posterior use */priv-hwif_quirks entry-quirks;return 0;}dev_err(priv-device, Failed to find HW IF (id0x%x, gmac%d/%d)\n,id, needs_gmac, needs_gmac4);return -EINVAL;
}以下是对上述代码用到的数据结构的一个整理以便于把握整体脉络
