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>
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@ -20,11 +20,11 @@ typedef struct VirtConsole {
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/* Callback function that's called when the guest sends us data */
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/* Callback function that's called when the guest sends us data */
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static void flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
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static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
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{
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{
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
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qemu_chr_write(vcon->chr, buf, len);
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return qemu_chr_write(vcon->chr, buf, len);
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}
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}
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/* Readiness of the guest to accept data on a port */
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/* Readiness of the guest to accept data on a port */
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@ -137,10 +137,11 @@ struct VirtIOSerialPortInfo {
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/*
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/*
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* Guest wrote some data to the port. This data is handed over to
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* Guest wrote some data to the port. This data is handed over to
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* the app via this callback. The app is supposed to consume all
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* the app via this callback. The app can return a size less than
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* the data that is presented to it.
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* 'len'. In this case, throttling will be enabled for this port.
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*/
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*/
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void (*have_data)(VirtIOSerialPort *port, const uint8_t *buf, size_t len);
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ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
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size_t len);
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};
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};
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/* Interface to the virtio-serial bus */
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/* Interface to the virtio-serial bus */
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