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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>
master
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 */ /* 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); 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 */ /* 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 * 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 app via this callback. The app can return a size less than
* the data that is presented to it. * '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 */ /* Interface to the virtio-serial bus */