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net: make use of async packet sending API in tap client 

If a packet is queued by qemu_send_packet(), remove I/O
handler for the tap fd until we get notification that the
packet has been sent.

A not insignificant side effect of this is we can now
drain the tap send queue in one go without fear of packets
being dropped.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
master
Mark McLoughlin 2009-04-29 13:30:24 +01:00
parent f3b6c7fcf8
commit e19eb22486
1 changed files with 20 additions and 4 deletions
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24
net.c
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@ -1079,15 +1079,31 @@ static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
}
#endif
static void tap_send(void *opaque);
static void tap_send_completed(VLANClientState *vc)
{
TAPState *s = vc->opaque;
qemu_set_fd_handler2(s->fd, tap_can_send, tap_send, NULL, s);
}
static void tap_send(void *opaque)
{
TAPState *s = opaque;
int size;
size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
if (size > 0) {
qemu_send_packet(s->vc, s->buf, size);
}
do {
size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
if (size <= 0) {
break;
}
size = qemu_send_packet_async(s->vc, s->buf, size, tap_send_completed);
if (size == 0) {
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
}
} while (size > 0);
}
static void tap_cleanup(VLANClientState *vc)