struct_usb_host_endpoint (9)

struct usb_host_endpoint {
  struct usb_endpoint_descriptor desc;
  struct usb_ss_ep_comp_descriptor ss_ep_comp;
  struct list_head urb_list;
  void * hcpriv;
  struct ep_device * ep_dev;
  unsigned char * extra;
  int extralen;
  int enabled;
  int streams;
};

desc

descriptor for this endpoint, wMaxPacketSize in native byteorder

ss_ep_comp

SuperSpeed companion descriptor for this endpoint

urb_list

urbs queued to this endpoint; maintained by usbcore

hcpriv

for use by HCD; typically holds hardware dma queue head (QH) with one or more transfer descriptors (TDs) per urb

ep_dev

ep_device for sysfs info

extra

descriptors following this endpoint in the configuration

extralen

how many bytes of “extra” are valid

enabled

URBs may be submitted to this endpoint

streams

number of USB-3 streams allocated on the endpoint

USB requests are always queued to a given endpoint, identified by a descriptor within an active interface in a given USB configuration.