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[usb] Allow USB endpoints to specify a reserved header length for refills

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2016-01-19 00:01:11 +00:00
parent 8dc23d9b83
commit 71b83a6d00
11 changed files with 31 additions and 20 deletions
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8
src/drivers/bus/usb.c
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@@ -601,6 +601,7 @@ void usb_complete_err ( struct usb_endpoint *ep, struct io_buffer *iobuf,
*/
int usb_prefill ( struct usb_endpoint *ep ) {
struct io_buffer *iobuf;
size_t reserve = ep->reserve;
size_t len = ( ep->len ? ep->len : ep->mtu );
unsigned int fill;
int rc;
@@ -614,11 +615,12 @@ int usb_prefill ( struct usb_endpoint *ep ) {
for ( fill = 0 ; fill < ep->max ; fill++ ) {
/* Allocate I/O buffer */
iobuf = alloc_iob ( len );
iobuf = alloc_iob ( reserve + len );
if ( ! iobuf ) {
rc = -ENOMEM;
goto err_alloc;
}
iob_reserve ( iobuf, reserve );
/* Add to recycled buffer list */
list_add_tail ( &iobuf->list, &ep->recycled );
@@ -639,6 +641,7 @@ int usb_prefill ( struct usb_endpoint *ep ) {
*/
int usb_refill ( struct usb_endpoint *ep ) {
struct io_buffer *iobuf;
size_t reserve = ep->reserve;
size_t len = ( ep->len ? ep->len : ep->mtu );
int rc;
@@ -652,9 +655,10 @@ int usb_refill ( struct usb_endpoint *ep ) {
/* Get or allocate buffer */
if ( list_empty ( &ep->recycled ) ) {
/* Recycled buffer list is empty; allocate new buffer */
iobuf = alloc_iob ( len );
iobuf = alloc_iob ( reserve + len );
if ( ! iobuf )
return -ENOMEM;
iob_reserve ( iobuf, reserve );
} else {
/* Get buffer from recycled buffer list */
iobuf = list_first_entry ( &ep->recycled,