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usb: use iovecs in USBPacket

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Zap data pointer from USBPacket, add a QEMUIOVector instead.
Add a bunch of helper functions to manage USBPacket data.
Switch over users to the new interface.

Note that USBPacket->len was used for two purposes:  First to
pass in the buffer size and second to return the number of
transfered bytes or the status code on async transfers.  There
is a new result variable for the latter.  A new status code
was added to catch uninitialized result.

Nobody creates iovecs with more than one element (yet).
Some users are (temporarely) limited to iovecs with a single
element to keep the patch size as small as possible.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-07-12 15:22:25 +02:00
parent d35bf9ade5
commit 4f4321c11f
21 changed files with 338 additions and 222 deletions
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13
hw/usb.h
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@ -285,12 +285,21 @@ struct USBPacket {
int pid;
uint8_t devaddr;
uint8_t devep;
uint8_t *data;
int len;
QEMUIOVector iov;
int result; /* transfer length or USB_RET_* status code */
/* Internal use by the USB layer. */
USBDevice *owner;
};
void usb_packet_init(USBPacket *p);
void usb_packet_setup(USBPacket *p, int pid, uint8_t addr, uint8_t ep);
void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len);
int usb_packet_map(USBPacket *p, QEMUSGList *sgl);
void usb_packet_unmap(USBPacket *p);
void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes);
void usb_packet_skip(USBPacket *p, size_t bytes);
void usb_packet_cleanup(USBPacket *p);
int usb_handle_packet(USBDevice *dev, USBPacket *p);
void usb_packet_complete(USBDevice *dev, USBPacket *p);
void usb_cancel_packet(USBPacket * p);