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USB学习_xhci代码

作者：Cpp五条 | 2024-05-23 18:14:07

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xhci代码

系统USB设备拓扑： 

 当前系统中的usb 3.0控制器是pcie设备：

  1. [root@localhost devices]# lspci  |grep USB
  2. 04:00.0 USB controller: Device 1db7:dc27
  3. 04:00.1 USB controller: Device 1db7:dc27
  4. 04:00.2 USB controller: Device 1db7:dc27
  5. 04:00.3 USB controller: Device 1db7:dc27
  6. 04:00.4 USB controller: Device 1db7:dc27
  7. 04:00.5 USB controller: Device 1db7:dc27
  8. 04:00.6 USB controller: Device 1db7:dc27
  9. 04:00.7 USB controller: Device 1db7:dc27

lsusb列举当前的usb设备: root_hub是当前控制器上的hub。hub也是一个特殊的usb设备。 下面才是常规的usb设备。

  1. lsusb -tv:
  2.  
  3. /:  Bus 16.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M  //3.0 ?
  4. /:  Bus 15.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M    //2.0 ?
  5.     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
  6.     |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
  7. /:  Bus 14.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  8. /:  Bus 13.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  9. /:  Bus 12.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  10. /:  Bus 11.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  11. /:  Bus 10.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  12. /:  Bus 09.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  13.     |__ Port 1: Dev 2, If 0, Class=Audio, Driver=snd-usb-audio, 12M
  14.     |__ Port 1: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
  15.     |__ Port 1: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 12M
  16.     |__ Port 1: Dev 2, If 3, Class=Human Interface Device, Driver=, 12M
  17. /:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  18. /:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  19. /:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  20. /:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  21. /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  22. /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  23.     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
  24. /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  25. /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M

根据上面的lspci和lsusb。应该是一个控制器带了两个root_hub。一个高速的一个低速的。lsusb -v 可以看到iSerial信息。其中有具体的pcie设备。 

  1. [root@localhost devices]# lsusb -s 16:1 -v
  2.  
  3. Bus 016 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  4. Device Descriptor:
  5.   bLength                18
  6.   bDescriptorType         1
  7.   bcdUSB               3.10
  8.   bDeviceClass            9 Hub
  9.   bDeviceSubClass         0 
  10.   bDeviceProtocol         3 
  11.   bMaxPacketSize0         9
  12.   idVendor           0x1d6b Linux Foundation
  13.   idProduct          0x0003 3.0 root hub
  14.   bcdDevice            4.19
  15.   iManufacturer           3 Linux 4.19.152+ xhci-hcd
  16.   iProduct                2 xHCI Host Controller
  17.   iSerial                 1 0000:04:00.7  //pcie usb控制器
  18.   bNumConfigurations      1
  19.   Configuration Descriptor:
  20.     bLength                 9
  21. 。。。。省略
  22.  
  23.  
  24. [root@localhost devices]# lsusb -s 15:1 -v
  25.  
  26. Bus 015 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  27. Device Descriptor:
  28.   bLength                18
  29.   bDescriptorType         1
  30.   bcdUSB               2.00
  31.   bDeviceClass            9 Hub
  32.   bDeviceSubClass         0 
  33.   bDeviceProtocol         1 Single TT
  34.   bMaxPacketSize0        64
  35.   idVendor           0x1d6b Linux Foundation
  36.   idProduct          0x0002 2.0 root hub
  37.   bcdDevice            4.19
  38.   iManufacturer           3 Linux 4.19.152+ xhci-hcd
  39.   iProduct                2 xHCI Host Controller
  40.   iSerial                 1 0000:04:00.7  //pcie usb控制器
  41.   bNumConfigurations      1
  42.   Configuration Descriptor:
  43. 。。。。省略

如果我插入一个绿联usb2.0的 集线器，上面接了鼠标键盘后lsusb查看：

  1. [root@localhost devices]# lsusb -tv
  2. /:  Bus 16.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  3. /:  Bus 15.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  4.     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
  5.     |__ Port 1: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
  6. /:  Bus 14.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  7. /:  Bus 13.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  8. /:  Bus 12.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  9. /:  Bus 11.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  10. /:  Bus 10.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  11. /:  Bus 09.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  12.     |__ Port 1: Dev 2, If 0, Class=Audio, Driver=snd-usb-audio, 12M
  13.     |__ Port 1: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
  14.     |__ Port 1: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 12M
  15.     |__ Port 1: Dev 2, If 3, Class=Human Interface Device, Driver=, 12M
  16. /:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  17. /:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  18. /:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  19. /:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  20.     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M   //多了一个hub，下面挂了结构设备。
  21.         |__ Port 2: Dev 3, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
  22.         |__ Port 3: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
  23.         |__ Port 4: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M
  24.         |__ Port 4: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 12M
  25. /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  26. /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
  27.     |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
  28. /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
  29. /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M

可以发现，新加入的hub已经出现了，并且是接在Bus 05,Port 1:Dev1 下面。这是一个普通的hub。

linux内核USB驱动匹配框架：

1：xhci控制器通过usb_alloc_dev创建usb_device，其总线是usb_type_bus，type是usb_device_type。 参考usb_alloc_dev。

2：usb_register_devie_driver在drivers./usb/core/usb.c的usb_init中。注册一个usb_deviec_driver(drivers/usb/core/generic.c)。其bus也是usb_type_bus。

3：任何usb_device都将第一步匹配到usb_device_driver。

4：generic_probe创建创建device(usb_interface)，其总线是usb_type_bus， type是usb_interface_type，参考usb_set_configuration。

5：usb_type_bus的match函数usb_device_match，根据type来匹配。

总结：一个usb的设备会经过两层的匹配，第一次匹配usb_device_type。第二次匹配usb_interface_type。第一次的驱动是usb_device_driver，内核中就是generic.c中定义的。第二次是usb_driver，具体到不同的驱动，包括hub.c中的hub驱动。

USB各种描述的层次结构：

  1. Device Descriptor：  //设备描述
  2. 	Configuration Descriptor:    //配置描述0，一个设备可能有多个配置，当前激活的。
  3. 		Interface Descriptor:     //接口描述0。
  4. 			HID Device Descriptor:
  5. 			Endpoint Descriptor:  //端点描述
  6. 		Interface Descriptor:     //接口描述1。      
  7. 			HID Device Descriptor:
  8. 			Endpoint Descriptor: //端点描述
  9. 		......
  10.  
  11.  
  12.  
  13. 相关结构体：
  14.  
  15. struct usb_device {
  16. 	struct usb_device_descriptor descriptor;
  17. 	struct usb_host_bos *bos;
  18. 	struct usb_host_endpoint ep0;      //0端口，用来作为控制使用指向ep_in[0]/ep_out[0]
  19. 	
  20. 	struct usb_host_config *config;      //一个usb_device 可以有多个configuration
  21. 	struct usb_host_config *actconfig;	    //当前激活的configuration
  22. 	
  23. 	struct usb_host_endpoint *ep_in[16];   //IN ENDPOINT 总共16个
  24. 	struct usb_host_endpoint *ep_out[16];
  25. }
  26.  
  27.  
  28. struct usb_host_config {
  29. 	struct usb_config_descriptor	desc;
  30. 	char *string;		/* iConfiguration string, if present */
  31. 	struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS];
  32. 	struct usb_interface *interface[USB_MAXINTERFACES]; //32个。
  33. 	struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
  34. 	unsigned char *extra;   /* Extra descriptors */
  35. 	int extralen;
  36. };
  37.  
  38. struct usb_interface {
  39. 	struct usb_host_interface *altsetting;
  40. 	struct usb_host_interface *cur_altsetting;	/* the currently
  41. 					 * active alternate setting */
  42. 	unsigned num_altsetting;	/* number of alternate settings */
  43. 	struct usb_interface_assoc_descriptor *intf_assoc;
  44. };
  45.  
  46. struct usb_host_interface {
  47. 	struct usb_interface_descriptor	desc; //接口描述符，其中会描述该接口有多少个端口
  48.  
  49. 	int extralen;
  50. 	unsigned char *extra;   /* Extra descriptors */
  51. 	struct usb_host_endpoint *endpoint; 	//端口数组。IN/OUT
  52.  
  53. 	char *string;		/* iInterface string, if present */
  54. };
  55.  
  56.  
  57. struct usb_host_endpoint {
  58. 	struct usb_endpoint_descriptor		desc;  //bEndpointAddress这个字段描述的信息挺多的，比如这个端点是输入端点还是输出端点，这个端点的地址等
  59. 	struct usb_ss_ep_comp_descriptor	ss_ep_comp;
  60. 	struct usb_ssp_isoc_ep_comp_descriptor	ssp_isoc_ep_comp;
  61. 	struct list_head		urb_list;
  62. 	void				*hcpriv;
  63. 	struct ep_device		*ep_dev;	/* For sysfs info */
  64.  
  65. 	unsigned char *extra;   /* Extra descriptors */
  66. 	int extralen;
  67. 	int enabled;
  68. 	int streams;
  69. };
  70.

设备创建之获取描述符、创建interface的流程：

  1. 创建usb_device的过程中解析描述符：
  2. hub_port_connect
  3. 	hub_port_init
  4. 		usb_get_device_descriptor
  5. 			usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, size);
  6.  
  7. 	usb_new_device    //hub.c
  8. 		usb_enumerate_device    //hub.c     
  9. 			usb_get_configuration //config.c  为N个config循环处理，一次性获取配置描述符，接口描述符，端口描述符。
  10. 				usb_get_descriptor  //usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,desc, USB_DT_CONFIG_SIZE);
  11. 				usb_parse_configuration
  12. 					usb_parse_interface
  13. 						usb_parse_endpoint   //解析当前interface下面所有的endpoint。
  14. 						
  15. 						
  16. usb_device匹配generic_probe后的初始化interface：
  17. 	usb_set_configuration      //循环为N个interface，创建usb_interface ....
  18. 		usb_enable_interface
  19. 			usb_enable_endpoint
  20. 				//根据endpoint的bEndpointAddress，计算第N个endpoint，并设置dev->ep_in/ep_out
  21. 		device_add
  22. 		create_intf_ep_devs
  23.  
  24.  
  25.  
  26.  
  27. 插入usb网卡到endpoint解析：
  28. ==================================================
  29. [  322.032676]  usbnet_get_endpoints+0x3c/0x1d0 [usbnet]
  30. [  322.032681]  ax88179_bind+0x3c/0x354 [ax88179_178a]
  31. [  322.032686]  usbnet_probe+0x2d0/0x830 [usbnet]
  32. [  322.032689]  usb_probe_interface+0xe8/0x300
  33. [  322.032694]  really_probe+0xfc/0x560
  34. [  322.032697]  driver_probe_device+0x108/0x190
  35. [  322.032700]  __device_attach_driver+0xe0/0x180
  36. [  322.032703]  bus_for_each_drv+0x7c/0xdc
  37. [  322.032705]  __device_attach+0xe4/0x1e0
  38. [  322.032708]  device_initial_probe+0x20/0x30
  39. [  322.032711]  bus_probe_device+0xa4/0xb0
  40. [  322.032713]  device_add+0x354/0x770
  41. [  322.032717]  usb_set_configuration+0x508/0xaa0
  42. [  322.032720]  usb_generic_driver_probe+0x70/0xb0
  43. [  322.032723]  usb_probe_device+0x4c/0x12c
  44. [  322.032726]  really_probe+0xfc/0x560
  45. [  322.032728]  driver_probe_device+0x108/0x190
  46. [  322.032731]  __device_attach_driver+0xe0/0x180
  47. [  322.032734]  bus_for_each_drv+0x7c/0xdc
  48. [  322.032736]  __device_attach+0xe4/0x1e0
  49. [  322.032739]  device_initial_probe+0x20/0x30
  50. [  322.032742]  bus_probe_device+0xa4/0xb0
  51. [  322.032744]  device_add+0x354/0x770
  52. [  322.032747]  usb_new_device+0x1e0/0x520
  53. [  322.032749]  hub_event+0x144c/0x182c

比如一个usbhid键盘设备：

drivers/hid/usbhid/hid-core.c 中注册了usb_deriver:hid_driver:

  1. static const struct usb_device_id hid_usb_ids[] = {
  2.         { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
  3.                 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
  4.         { }                                             /* Terminating entry */
  5. };
  6.  
  7. MODULE_DEVICE_TABLE (usb, hid_usb_ids);
  8.  
  9. static struct usb_driver hid_driver = {
  10.         .name =         "usbhid",
  11.         .probe =        usbhid_probe,
  12.         .disconnect =   usbhid_disconnect,
  13. #ifdef CONFIG_PM
  14.         .suspend =      hid_suspend,
  15.         .resume =       hid_resume,
  16.         .reset_resume = hid_reset_resume,
  17. #endif
  18.         .pre_reset =    hid_pre_reset,
  19.         .post_reset =   hid_post_reset,
  20.         .id_table =     hid_usb_ids,
  21.         .supports_autosuspend = 1,
  22. };
  23.  
  24.  
  25. //然后在usbhid_probe中创建usbhid设备：
  26. static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
  27. {
  28.         struct usb_host_interface *interface = intf->cur_altsetting;
  29.         struct usb_device *dev = interface_to_usbdev(intf);
  30.         struct usbhid_device *usbhid;
  31.         struct hid_device *hid;
  32.         unsigned int n, has_in = 0;
  33.         size_t len;
  34.         int ret;
  35.  
  36.         dbg_hid("HID probe called for ifnum %d\n",
  37.                         intf->altsetting->desc.bInterfaceNumber);
  38.  
  39.         for (n = 0; n < interface->desc.bNumEndpoints; n++)
  40.                 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
  41.                         has_in++;
  42.         if (!has_in) {
  43.                 hid_err(intf, "couldn't find an input interrupt endpoint\n");
  44.                 return -ENODEV;
  45.         }
  46.  
  47.         hid = hid_allocate_device();  //drivers/hid/hid-core.c
  48.  
  49.  
  50. ....
  51.  
  52.  
  53. }
  54.  
  55. drivers/hid/hid-core.c 中注册了bus_register(&hid_bus_type); 总线
  56. drivers/his/hid-generic.c 中注册了hid_driver：hid_generic 。
  57. 因此将完成hid总线的匹配流程；
  58. hid最终通过input_register_device 创建input设备。。。。。
  59. 具体按键触发中断，怎么从xhci接口到input 可以查看"当我们切换linux终端时，背后发生了什么？" 那篇https://mp.csdn.net/mp_blog/creation/editor/129945303

(139条消息) USB驱动框架_WuYuJun's blog的博客-CSDN博客

usb中断和hub创建：

(139条消息) Kernel-USB 驱动架构_kernel usb驱动_未来的全栈工程师的博客-CSDN博客

hub创建usb_device：

  1. hub_probe
  2. 	INIT_WORK(&hub->events, hub_event); //初始化工作队列 ，hub_event为处理函数
  3. 	
  4. hub_irq
  5. 	kick_hub_wq
  6. 		queue_work(hub_wq, &hub->events); //激活工作队列
  7. 				
  8.  
  9. hub_event
  10. 	hub_port_connect_change
  11. 		hub_port_connect
  12. 			usb_alloc_dev
  13. 			hub_port_init
  14. 			usb_new_device
  15. 			
  16. 			
  17.  
  18. 如何才能激活tasklet？ 调用hub_irq
  19. usb_hcd_giveback_urb
  20. 	__usb_hcd_giveback_urb //完成urb的complete回调hub_irq
  21. 		hub_irq
  22. 	tasklet_hi_schedule/tasklet_schedule  //激活tasklet usb_add_hcd的时候init_giveback_urb_bh初始化。
  23. 		usb_giveback_urb_bh
  24. 			__usb_hcd_giveback_urb
  25. 				hub_irq
  26. 	
  27.  
  28.  
  29.  
  30. 插入：
  31. [  445.397729] ===usb_hcd_giveback_urb 
  32. [  445.401297] CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 4.19.152+ #38
  33. [  445.407808] Hardware name: PHYTIUM LTD D2000/D2000, BIOS  
  34. [  445.413286] Workqueue: pm hcd_resume_work
  35. [  445.417282] Call trace:
  36. [  445.419718]  dump_backtrace+0x0/0x198
  37. [  445.423366]  show_stack+0x24/0x30
  38. [  445.426668]  dump_stack+0x9c/0xd0
  39. [  445.429970]  usb_hcd_giveback_urb+0x108/0x198  //tasklet
  40. [  445.434312]  rh_call_control+0x1ec/0x820
  41. [  445.438221]  usb_hcd_submit_urb+0x104/0x310
  42. [  445.442389]  usb_submit_urb+0x1e8/0x558
  43. [  445.446211]  usb_start_wait_urb+0x70/0x160
  44. [  445.450293]  usb_control_msg+0xc4/0x138
  45. [  445.454115]  hub_ext_port_status+0xac/0x188
  46. [  445.458284]  hub_activate+0x120/0x6d0
  47. [  445.461932]  hub_resume+0x4c/0x140
  48. [  445.465320]  usb_resume_interface.isra.1+0xbc/0x138
  49. [  445.470183]  usb_resume_both+0xdc/0x138
  50. [  445.474004]  usb_runtime_resume+0x24/0x30
  51. [  445.478001]  __rpm_callback+0x150/0x258
  52. [  445.481823]  rpm_callback+0x34/0x98
  53. [  445.485297]  rpm_resume+0x65c/0x840
  54. [  445.488772]  __pm_runtime_resume+0x70/0xb0
  55. [  445.492854]  usb_autoresume_device+0x28/0x60
  56. [  445.497109]  usb_remote_wakeup+0x60/0xb8
  57. [  445.501017]  hcd_resume_work+0x20/0x30
  58. [  445.504753]  process_one_work+0x1ac/0x3e0
  59. [  445.508748]  worker_thread+0x44/0x448
  60. [  445.512397]  kthread+0x130/0x138
  61. [  445.515612]  ret_from_fork+0x10/0x18
  62.  
  63.  
  64.  
  65. 。。。。。。。。
  66.  
  67. [  446.576330]  usb_submit_urb+0x1e8/0x558
  68. [  446.580152]  usb_start_wait_urb+0x70/0x160
  69. [  446.584234]  usb_control_msg+0xc4/0x138
  70. [  446.588055]  usb_clear_port_feature+0x5c/0x70
  71. [  446.592397]  hub_port_reset+0x1e8/0x630
  72. [  446.596218]  hub_port_init+0x28c/0xb20
  73. [  446.599952]  hub_port_connect+0x26c/0xa10
  74. [  446.603947]  port_event+0x37c/0x700
  75. [  446.607421]  hub_event+0x138/0x3d0

USB网卡驱动usbnet
(143条消息) usbnet驱动深入分析-usb虚拟网卡host端_ldd的博客-CSDN博客

触发了软中断 tasklet_schedule后在硬件中断后irq_exit会执行SOFTIRQ中的TASKLET：

  1. asix:网卡接收数据
  2. ================================================
  3. [  122.536037] ===rx_submit 
  4. [  122.536275] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.10.0 #2
  5. [  122.536511] Hardware name: PHYTIUM LTD D2000/D2000, BIOS  
  6. [  122.536746] Call trace:
  7. [  122.536980]  dump_backtrace+0x0/0x1dc
  8. [  122.537216]  show_stack+0x24/0x70
  9. [  122.537453]  dump_stack+0xd0/0x12c
  10. [  122.537690]  rx_submit+0x188/0x2c4 [usbnet]
  11. [  122.538001]  rx_complete+0x2a8/0x310 [usbnet]
  12. [  122.538233]  __usb_hcd_giveback_urb+0xa4/0x154
  13. [  122.538465]  usb_giveback_urb_bh+0xf8/0x200
  14. [  122.538697]  tasklet_action_common.constprop.0+0x154/0x1dc
  15. [  122.538930]  tasklet_action+0x34/0x40
  16. [  122.539161]  __do_softirq+0x160/0x594
  17. [  122.539394]  irq_exit+0xbc/0x104
  18. [  122.539627]  __handle_domain_irq+0x8c/0xf0
  19. [  122.539859]  gic_handle_irq+0xd8/0x384
  20. [  122.540091]  el1_irq+0xd0/0x180
  21. [  122.540324]  arch_cpu_idle+0x18/0x40
  22. [  122.540556]  default_idle_call+0x4c/0x220
  23. [  122.540711]  do_idle+0x264/0x330
  24. [  122.540714]  cpu_startup_entry+0x34/0xa0
  25. [  122.540717]  secondary_start_kernel+0x16c/0x220
  26.  
  27.  
  28. 网卡发送数据：
  29. ====================================================
  30. [  337.134965]  usbnet_start_xmit+0x44/0xb74 [usbnet]
  31. [  337.134969]  dev_hard_start_xmit+0xe4/0x2d0
  32. [  337.134973]  sch_direct_xmit+0x154/0x54c
  33. [  337.134975]  __dev_queue_xmit+0x8ec/0xa90
  34. [  337.134978]  dev_queue_xmit+0x20/0x30
  35. [  337.134983]  packet_sendmsg+0xa00/0x12b0
  36. [  337.134987]  sock_sendmsg+0x60/0x7c
  37. [  337.134990]  sock_write_iter+0xa4/0x104    //socket_file_ops->sock_write_iter
  38. [  337.134994]  new_sync_write+0x17c/0x1a0
  39. [  337.134997]  vfs_write+0x224/0x2bc  
  40. [  337.134999]  ksys_write+0xe8/0x100
  41. [  337.135002]  __arm64_sys_write+0x28/0x3c
  42. [  337.135006]  el0_svc_common.constprop.0+0x88/0x220
  43. [  337.135009]  do_el0_svc+0x34/0xa0
  44. [  337.135012]  el0_svc+0x28/0x70
  45.

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