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usb-host: iovec support 

Add full support for iovecs to usb-host.  The code can split large
transfers into smaller ones already, we are using this to also split
requests at iovec borders.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-07-13 11:28:17 +02:00
parent 9440b7e555
commit b621bab436
1 changed files with 18 additions and 9 deletions
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27
usb-linux.c
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@ -707,7 +707,7 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev);
struct usbdevfs_urb *urb;
AsyncURB *aurb;
int ret, rem;
int ret, rem, prem, v;
uint8_t *pbuf;
uint8_t ep;
@ -735,10 +735,18 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
return usb_host_handle_iso_data(s, p, p->pid == USB_TOKEN_IN);
}
assert(p->iov.niov == 1); /* temporary */
rem = p->iov.iov[0].iov_len;
pbuf = p->iov.iov[0].iov_base;
v = 0;
prem = p->iov.iov[v].iov_len;
pbuf = p->iov.iov[v].iov_base;
rem = p->iov.size;
while (rem) {
if (prem == 0) {
v++;
assert(v < p->iov.niov);
prem = p->iov.iov[v].iov_len;
pbuf = p->iov.iov[v].iov_base;
assert(prem <= rem);
}
aurb = async_alloc(s);
aurb->packet = p;
@ -747,16 +755,17 @@ static int usb_host_handle_data(USBDevice *dev, USBPacket *p)
urb->type = USBDEVFS_URB_TYPE_BULK;
urb->usercontext = s;
urb->buffer = pbuf;
urb->buffer_length = prem;
if (rem > MAX_USBFS_BUFFER_SIZE) {
if (urb->buffer_length > MAX_USBFS_BUFFER_SIZE) {
urb->buffer_length = MAX_USBFS_BUFFER_SIZE;
aurb->more = 1;
} else {
urb->buffer_length = rem;
aurb->more = 0;
}
pbuf += urb->buffer_length;
prem -= urb->buffer_length;
rem -= urb->buffer_length;
if (rem) {
aurb->more = 1;
}
ret = ioctl(s->fd, USBDEVFS_SUBMITURB, urb);