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USB: serial: add support for multiple read urbs

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Add support for multiple read urbs to generic read implementation.

Use a static array of two read urbs for now which is enough to get a
50% throughput increase in one test setup.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold
2011-11-06 19:06:37 +01:00
committed by Greg Kroah-Hartman
parent f5230a53c1
commit d83b405383
3 changed files with 101 additions and 41 deletions
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9
include/linux/usb/serial.h
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@@ -58,6 +58,9 @@ enum port_dev_state {
* @read_urb: pointer to the bulk in struct urb for this port.
* @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
* port.
* @bulk_in_buffers: pointers to the bulk in buffers for this port
* @read_urbs: pointers to the bulk in urbs for this port
* @read_urbs_free: status bitmap the for bulk in urbs
* @bulk_out_buffer: pointer to the bulk out buffer for this port.
* @bulk_out_size: the size of the bulk_out_buffer, in bytes.
* @write_urb: pointer to the bulk out struct urb for this port.
@@ -98,6 +101,10 @@ struct usb_serial_port {
struct urb *read_urb;
__u8 bulk_in_endpointAddress;
unsigned char *bulk_in_buffers[2];
struct urb *read_urbs[2];
unsigned long read_urbs_free;
unsigned char *bulk_out_buffer;
int bulk_out_size;
struct urb *write_urb;
@@ -338,7 +345,7 @@ extern void usb_serial_generic_disconnect(struct usb_serial *serial);
extern void usb_serial_generic_release(struct usb_serial *serial);
extern int usb_serial_generic_register(int debug);
extern void usb_serial_generic_deregister(void);
extern int usb_serial_generic_submit_read_urb(struct usb_serial_port *port,
extern int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
gfp_t mem_flags);
extern void usb_serial_generic_process_read_urb(struct urb *urb);
extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,