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[Qemu-devel] [PATCH 4/4] virtio: console: add flow control
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PATCH 4/4] virtio: console: add flow control |
Date: |
Mon, 4 Feb 2013 18:20:50 +0530 |
The virtio-serial-bus already has the logic to make flow control work
properly. Hook into the char layer's new ability to signal a backend is
writable again.
Signed-off-by: Amit Shah <address@hidden>
---
hw/virtio-console.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index 46072a0..0cf6072 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -20,6 +20,18 @@ typedef struct VirtConsole {
CharDriverState *chr;
} VirtConsole;
+/*
+ * Callback function that's called from chardevs when backend becomes
+ * writable.
+ */
+static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
+ void *opaque)
+{
+ VirtConsole *vcon = opaque;
+
+ virtio_serial_throttle_port(&vcon->port, false);
+ return false;
+}
/* Callback function that's called when the guest sends us data */
static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t
len)
@@ -48,6 +60,7 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const
uint8_t *buf, size_t len)
* do_flush_queued_data().
*/
ret = 0;
+ qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked, vcon);
}
return ret;
}
--
1.8.1