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When frontend and backend are connected through a hub as below (showing only one direction), and the frontend (or in general, all output ports of the hub) cannot accept more traffic, the backend queues packets in queue-A. When the frontend (or in general, one output port) becomes ready again, quemu tries to flush packets from queue-B, which is unfortunately empty. e1000.0 <--[queue B]-- hub0port0(hub)hub0port1 <--[queue A]-- tap.0 To fix this i propose to introduce a new function net_hub_flush() which is called when trying to flush a queue connected to a hub. Signed-off-by: Luigi Rizzo <rizzo@iet.unipi.it> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
27 lines
647 B
C
27 lines
647 B
C
/*
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* Hub net client
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#ifndef NET_HUB_H
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#define NET_HUB_H
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#include "qemu-common.h"
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NetClientState *net_hub_add_port(int hub_id, const char *name);
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NetClientState *net_hub_find_client_by_name(int hub_id, const char *name);
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void net_hub_info(Monitor *mon);
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void net_hub_check_clients(void);
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bool net_hub_flush(NetClientState *nc);
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#endif /* NET_HUB_H */
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