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2018-01-29net: Allow hubports to connect to other netdevsThomas Huth1-1/+2
QEMU can emulate hubs to connect NICs and netdevs. This is currently primarily used for the mis-named 'vlan' feature of the networking subsystem. Now the 'vlan' feature has been marked as deprecated, since its name is rather confusing and the users often rather mis-configure their network when trying to use it. But while the 'vlan' parameter should be removed at one point in time, the basic idea of emulating a hub in QEMU is still good: It's useful for bundling up the output of multiple NICs into one single l2tp netdev for example. Now to be able to use the hubport feature without 'vlan's, there is one missing piece: The possibility to connect a hubport to a netdev, too. This patch adds this possibility by introducing a new "netdev=..." parameter to the hubports. To bundle up the output of multiple NICs into one socket netdev, you can now run QEMU with these parameters for example: qemu-system-ppc64 ... -netdev socket,id=s1,connect=:11122 \ -netdev hubport,hubid=1,id=h1,netdev=s1 \ -netdev hubport,hubid=1,id=h2 -device e1000,netdev=h2 \ -netdev hubport,hubid=1,id=h3 -device virtio-net-pci,netdev=h3 For using the socket netdev, you have got to start another QEMU as the receiving side first, for example with network dumping enabled: qemu-system-x86_64 -M isapc -netdev socket,id=s0,listen=:11122 \ -device ne2k_isa,netdev=s0 \ -object filter-dump,id=f1,netdev=s0,file=/tmp/dump.dat After the ppc64 guest tried to boot from both NICs, you can see in the dump file (using Wireshark, for example), that the output of both NICs (the e1000 and the virtio-net-pci) has been successfully transfered via the socket netdev in this case. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
2013-02-27net: fix qemu_flush_queued_packets() in presence of a hubLuigi Rizzo1-0/+1
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>
2012-12-19net: reorganize headersPaolo Bonzini1-2/+0
Move public headers to include/net, and leave private headers in net/. Put the virtio headers in include/net/tap.h, removing the multiple copies that existed. Leave include/net/tap.h as the interface for NICs, and net/tap_int.h as the interface for OS-specific parts of the tap backend. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-08net: consolidate NetClientState header files into onePaolo Bonzini1-2/+0
This patch doesn't seem much useful alone, I must admit. However, it makes sense as part of the upcoming directory reorganization, where I want to have include/net/tap.h as the net<->hw interface for tap. Then having both net/tap.h and include/net/tap.h does not work. "Fixed" by moving all the init functions to a single header file net/clients.h. The patch also adopts a uniform style for including net/*.h files from net/*.c, without the net/ path. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
2012-08-01net: Rename VLANClientState to NetClientStateStefan Hajnoczi1-5/+5
The vlan feature is no longer part of net core. Rename VLANClientState to NetClientState because net clients are not explicitly associated with a vlan at all, instead they have a peer net client to which they are connected. This patch is a mechanical search-and-replace except for a few whitespace fixups where changing VLANClientState to NetClientState misaligned whitespace. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2012-08-01net: Convert qdev_prop_vlan to peer with hubZhi Yong Wu1-0/+1
Instead of using VLANState use net/hub.h to support the vlan qdev property. The vlan qdev property becomes an alias for the peer qdev property but is represented as a VLAN ID number. When a VLAN ID is selected the device will really peer with a hub port. 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>
2012-08-01hub: Check that hubs are configured correctlyStefan Hajnoczi1-0/+1
Checks can be performed to make sure that hubs have at least one NIC and one host device, warning the user if this is not the case. Configurations which do not meet this rule tend to be broken but just emit a warning. This patch preserves compatibility with the checks performed by net core on vlans. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2012-08-01net: Look up 'vlan' net clients using hubsStefan Hajnoczi1-0/+1
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2012-08-01net: Use hubs for the vlan featureStefan Hajnoczi1-1/+1
Stop using the special-case vlan code in net.c. Instead use the hub net client to implement the vlan feature. The next patch will remove vlan code from net.c completely. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2012-08-01net: Add a hub net clientStefan Hajnoczi1-0/+26
The vlan feature can be implemented in terms of hubs. By introducing a hub net client it becomes possible to remove the special case vlan code from net.c and push the vlan feature out of generic networking code. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>