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virtio-serial: Let virtio-serial-bus know if all data was consumed 

The have_data() API to hand off guest data to apps using virtio-serial
so far assumed all the data was consumed.  Relax this assumption.
Future commits will allow for incomplete writes.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Amit Shah 2010-12-13 17:50:07 +05:30
parent 471344db88
commit e300ac275b
2 changed files with 6 additions and 5 deletions
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4
hw/virtio-console.c
View File

@ -20,11 +20,11 @@ typedef struct VirtConsole {
/* Callback function that's called when the guest sends us data */
static void flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
qemu_chr_write(vcon->chr, buf, len);
return qemu_chr_write(vcon->chr, buf, len);
}
/* Readiness of the guest to accept data on a port */

7
hw/virtio-serial.h
View File

@ -137,10 +137,11 @@ struct VirtIOSerialPortInfo {
/*
* Guest wrote some data to the port. This data is handed over to
* the app via this callback. The app is supposed to consume all
* the data that is presented to it.
* the app via this callback. The app can return a size less than
* 'len'. In this case, throttling will be enabled for this port.
*/
void (*have_data)(VirtIOSerialPort *port, const uint8_t *buf, size_t len);
ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
size_t len);
};
/* Interface to the virtio-serial bus */