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char-udp: flush as much buffer as possible 

Instead of flushing the buffer byte by byte, call qemu_chr_be_write()
with as much byte possible accepted by the front-end.

Factor out buffer flushing in a common function udp_chr_flush_buffer().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Marc-André Lureau 2016-12-23 14:55:54 +01:00
parent da2d19b080
commit e0b6767b6c
1 changed files with 15 additions and 11 deletions
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26
chardev/char-udp.c
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@ -51,6 +51,18 @@ static int udp_chr_write(Chardev *chr, const uint8_t *buf, int len)
s->ioc, (const char *)buf, len, NULL);
}
static void udp_chr_flush_buffer(UdpChardev *s)
{
Chardev *chr = CHARDEV(s);
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
int n = MIN(s->max_size, s->bufcnt - s->bufptr);
qemu_chr_be_write(chr, &s->buf[s->bufptr], n);
s->bufptr += n;
s->max_size = qemu_chr_be_can_write(chr);
}
}
static int udp_chr_read_poll(void *opaque)
{
Chardev *chr = CHARDEV(opaque);
@ -61,11 +73,8 @@ static int udp_chr_read_poll(void *opaque)
/* If there were any stray characters in the queue process them
* first
*/
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
s->bufptr++;
s->max_size = qemu_chr_be_can_write(chr);
}
udp_chr_flush_buffer(s);
return s->max_size;
}
@ -85,13 +94,8 @@ static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
return FALSE;
}
s->bufcnt = ret;
s->bufptr = 0;
while (s->max_size > 0 && s->bufptr < s->bufcnt) {
qemu_chr_be_write(chr, &s->buf[s->bufptr], 1);
s->bufptr++;
s->max_size = qemu_chr_be_can_write(chr);
}
udp_chr_flush_buffer(s);
return TRUE;
}