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hub: add the support for hub own flow control 

Only when all other hub port's *peer* .can_receive() all return 1,
the source hub port .can_receive() return 1.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Zhi Yong Wu 2012-07-24 16:35:19 +01:00 committed by Stefan Hajnoczi
parent 691a4f3a95
commit 52a3cb869f
1 changed files with 24 additions and 3 deletions
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27
net/hub.c
View File

@ -15,6 +15,7 @@
#include "monitor.h"
#include "net.h"
#include "hub.h"
#include "iov.h"
/*
* A hub broadcasts incoming packets to all its ports except the source port.
@ -59,16 +60,16 @@ static ssize_t net_hub_receive_iov(NetHub *hub, NetHubPort *source_port,
const struct iovec *iov, int iovcnt)
{
NetHubPort *port;
ssize_t ret = 0;
ssize_t len = iov_size(iov, iovcnt);
QLIST_FOREACH(port, &hub->ports, next) {
if (port == source_port) {
continue;
}
ret = qemu_sendv_packet(&port->nc, iov, iovcnt);
qemu_sendv_packet(&port->nc, iov, iovcnt);
}
return ret;
return len;
}
static NetHub *net_hub_new(int id)
@ -85,6 +86,25 @@ static NetHub *net_hub_new(int id)
return hub;
}
static int net_hub_port_can_receive(NetClientState *nc)
{
NetHubPort *port;
NetHubPort *src_port = DO_UPCAST(NetHubPort, nc, nc);
NetHub *hub = src_port->hub;
QLIST_FOREACH(port, &hub->ports, next) {
if (port == src_port) {
continue;
}
if (!qemu_can_send_packet(&port->nc)) {
return 0;
}
}
return 1;
}
static ssize_t net_hub_port_receive(NetClientState *nc,
const uint8_t *buf, size_t len)
{
@ -111,6 +131,7 @@ static void net_hub_port_cleanup(NetClientState *nc)
static NetClientInfo net_hub_port_info = {
.type = NET_CLIENT_OPTIONS_KIND_HUBPORT,
.size = sizeof(NetHubPort),
.can_receive = net_hub_port_can_receive,
.receive = net_hub_port_receive,
.receive_iov = net_hub_port_receive_iov,
.cleanup = net_hub_port_cleanup,