This allows fragmented packets to be sent with no additional copies over the
tap interface.
Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>
diff --git a/qemu/vl.c b/qemu/vl.c
index 1f0a6ac..7900b76 100644
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -4086,6 +4086,19 @@ static void tap_receive(void *opaque, const uint8_t
*buf, int size)
}
}
+static ssize_t tap_readv(void *opaque, const struct iovec *iov,
+ int iovcnt)
+{
+ TAPState *s = opaque;
+ ssize_t len;
+
+ do {
+ len = writev(s->fd, iov, iovcnt);
+ } while (len == -1 && (errno == EINTR || errno == EAGAIN));
+
+ return len;
+}
+
static void tap_send(void *opaque)
{
TAPState *s = opaque;
@@ -4135,6 +4148,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
s->no_poll = 0;
enable_sigio_timer(fd);
s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
+ s->vc->fd_readv = tap_readv;
qemu_set_fd_handler2(s->fd, tap_read_poll, tap_send, NULL, s);
snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);
return s;
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