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[usb] Allow endpoints to be refilled to a specified upper limit 

For USB mass storage devices, we do not want to submit more bulk IN
packets than are required for the inbound data, since this will waste
memory.

Allow an upper limit to be specified on each refill attempt.  The
endpoint will be refilled to the lower of this limit or the limit
specified by usb_refill_init().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/158/head
Michael Brown 2020-10-12 15:28:26 +01:00
parent ebf0166081
commit e30c26d01c
2 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/drivers/bus/usb.c
View File

@ -651,12 +651,13 @@ int usb_prefill ( struct usb_endpoint *ep ) {
}
/**
* Refill endpoint
* Refill endpoint up to specified limit
*
* @v ep USB endpoint
* @v max Fill limit
* @ret rc Return status code
*/
int usb_refill ( struct usb_endpoint *ep ) {
int usb_refill_limit ( struct usb_endpoint *ep, unsigned int max ) {
struct io_buffer *iobuf;
size_t reserve = ep->reserve;
size_t len = ( ep->len ? ep->len : ep->mtu );
@ -667,7 +668,9 @@ int usb_refill ( struct usb_endpoint *ep ) {
assert ( ep->max > 0 );
/* Refill endpoint */
while ( ep->fill < ep->max ) {
if ( max > ep->max )
max = ep->max;
while ( ep->fill < max ) {
/* Get or allocate buffer */
if ( list_empty ( &ep->recycled ) ) {
@ -698,6 +701,16 @@ int usb_refill ( struct usb_endpoint *ep ) {
return 0;
}
/**
* Refill endpoint
*
* @v ep USB endpoint
* @ret rc Return status code
*/
int usb_refill ( struct usb_endpoint *ep ) {
return usb_refill_limit ( ep, ep->max );
}
/**
* Discard endpoint recycled buffer list
*

1
src/include/ipxe/usb.h
View File

@ -621,6 +621,7 @@ usb_recycle ( struct usb_endpoint *ep, struct io_buffer *iobuf ) {
}
extern int usb_prefill ( struct usb_endpoint *ep );
extern int usb_refill_limit ( struct usb_endpoint *ep, unsigned int max );
extern int usb_refill ( struct usb_endpoint *ep );
extern void usb_flush ( struct usb_endpoint *ep );