/*
* vionet_rx
*
* Enqueue data that was received on a tap file descriptor
* to the vionet device queue.
*/
static int
vionet_rx(struct vionet_dev *dev)
{
char buf[PAGE_SIZE];
int hasdata, num_enq = 0, spc = 0;
ssize_t sz;
do {
sz = read(dev->fd, buf, sizeof buf);
if (sz == -1) {
/*
* If we get EAGAIN, No data is currently available.
* Do not treat this as an error.
*/
if (errno != EAGAIN)
log_warn("unexpected read error on vionet "
"device");
} else if (sz != 0)
num_enq += vionet_enq_rx(dev, buf, sz, &spc);
else if (sz == 0) {
log_debug("process_rx: no data");
hasdata = 0;
break;
}
hasdata = fd_hasdata(dev->fd);
} while (spc && hasdata);
dev->rx_pending = hasdata;
return (num_enq);
}
int
vionet_process_rx(void)
{
int i, num_enq, spc, hasdata;
ssize_t sz;
char *buf;
struct pollfd pfd;
num_enq = 0;
buf = malloc(PAGE_SIZE);
for (i = 0 ; i < nr_vionet; i++) {
if (!vionet[i].rx_added)
continue;
spc = 1;
hasdata = 1;
bzero(buf, PAGE_SIZE);
bzero(&pfd, sizeof(struct pollfd));
pfd.fd = vionet[i].fd;
pfd.events = POLLIN;
while (spc && hasdata) {
hasdata = poll(&pfd, 1, 0);
if (hasdata == 1) {
sz = read(vionet[i].fd, buf, PAGE_SIZE);
if (sz != 0) {
num_enq += vionet_enq_rx(&vionet[i],
buf, sz, &spc);
} else if (sz == 0) {
fprintf(stderr, "process_rx: no data"
"\n\r");
hasdata = 0;
}
}
}
}
free(buf);
/*
* XXX returns the number of packets enqueued across all vionet, which
* may not be right for VMs with more than one vionet.
*/
return (num_enq);
}