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2013-02-01tap: unbreak -netdev tap,fd=XAnthony Liguori1-1/+1
The multiqueue patch series broke -netdev tap,fd=X which manifests as libvirt not being able to start a guest. This was because it passed NULL for the netdev name which results in an anonymous netdev device regardless of what the user specified. Cc: Jason Wang <jasowang@redhat.com> Cc: Bruce Rogers <brogers@suse.com> Reported-by: Bruce Rogers <brogers@suse.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-01tap: multiqueue supportJason Wang1-35/+123
Recently, linux support multiqueue tap which could let userspace call TUNSETIFF for a signle device many times to create multiple file descriptors as independent queues. User could also enable/disabe a specific queue through TUNSETQUEUE. The patch adds the generic infrastructure to create multiqueue taps. To achieve this a new parameter "queues" were introduced to specify how many queues were expected to be created for tap by qemu itself. Alternatively, management could also pass multiple pre-created tap file descriptors separated with ':' through a new parameter fds like -netdev tap,id=hn0,fds="X:Y:..:Z". Multiple vhost file descriptors could also be passed in this way. Each TAPState were still associated to a tap fd, which mean multiple TAPStates were created when user needs multiqueue taps. Since each TAPState contains one NetClientState, with the multiqueue nic support, an N peers of NetClientState were built up. A new parameter, mq_required were introduce in tap_open() to create multiqueue tap fds. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-01tap: support enabling or disabling a queueJason Wang1-3/+40
This patch introduce a new bit - enabled in TAPState which tracks whether a specific queue/fd is enabled. The tap/fd is enabled during initialization and could be enabled/disabled by tap_enalbe() and tap_disable() which calls platform specific helpers to do the real work. Polling of a tap fd can only done when the tap was enabled. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-01tap: factor out common tap initializationJason Wang1-57/+73
This patch factors out the common initialization of tap into a new helper net_init_tap_one(). This will be used by multiqueue tap patches. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-01net: tap: using bool instead of bitfieldJason Wang1-20/+18
Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-12-19softmmu: move include files to include/sysemu/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19monitor: move include files to include/monitor/Paolo Bonzini1-1/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-12-19net: reorganize headersPaolo Bonzini1-3/+3
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>
2012-12-19janitor: do not include qemu-char everywherePaolo Bonzini1-1/+0
Touching char/char.h basically causes the whole of QEMU to be rebuilt. Avoid this, it is usually unnecessary. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-11-20tap: reset vnet header size on openMichael S. Tsirkin1-0/+7
For tap, we currently assume the vnet header size is 10 (the default value) but that might not be the case if tap is persistent and has been used by qemu previously. To fix, set host header size in tap device on open. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Alexander Graf <agraf@suse.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-10-08net: consolidate NetClientState header files into onePaolo Bonzini1-1/+2
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>
2012-09-07monitor: Rename+move net_handle_fd_param -> monitor_handle_fd_paramNicholas Bellinger1-2/+2
This patch renames+moves the net_handle_fd_param() caller used to obtain a file descriptor from either qemu_parse_fd() (the normal case) or from monitor_get_fd() (migration case) into a generically prefixed monitor_handle_fd_param() to be used by vhost-scsi code. Also update net/[socket,tap].c consumers to use the new prefix. Reported-by: Michael S. Tsirkin <mst@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2012-08-01net: Rename VLANClientState to NetClientStateStefan Hajnoczi1-19/+19
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: Drop vlan argument to qemu_new_net_client()Stefan Hajnoczi1-1/+1
Since hubs are now used to implement the 'vlan' feature and the vlan argument is always NULL, remove the argument entirely and update all net clients that use qemu_new_net_client(). 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 Hajnoczi1-6/+6
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>
2012-07-23remove unused QemuOpts parameter from net init functionsLaszlo Ersek1-4/+4
v1->v2: - unchanged v2->v3: - keep "qemu-option.h" included in "net/slirp.h" Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-07-23convert net_init_bridge() to NetClientOptionsLaszlo Ersek1-11/+12
Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-07-23convert net_init_tap() to NetClientOptionsLaszlo Ersek1-57/+54
Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-07-23convert net_client_init() to OptsVisitorLaszlo Ersek1-2/+4
The net_client_init() prototype is kept intact. Based on "is_netdev", the QemuOpts-rooted QemuOpt-list is parsed as a Netdev or a NetLegacy. The original meat of net_client_init() is moved to and simplified in net_client_init1(): Fields not common between -net and -netdev are clearly separated. Getting the name for the init functions is cleaner: Netdev::id is mandatory, and all init functions handle a NULL NetLegacy::name. NetLegacy::vlan explicitly depends on -net (see below). Verifying the "type=" option for -netdev can be turned into a switch. Format validation with qemu_opts_validate() can be removed because the visitor covers it. Relatedly, the "net_client_types" array is reduced to an array of init functions that can be directly indexed by opts->kind. (Help text is available in the schema JSON.) The outermost negation in the condition around qemu_find_vlan() was flattened, because it expresses the dependent code's requirements more clearly. VLAN lookup is avoided if there's no init function to pass the VLAN to. Whenever the value of type=... is needed, we substitute NetClientOptionsKind_lookup[kind]. The individual init functions are not converted yet, thus the original QemuOpts instance is passed transparently. v1->v2: - NetLegacy::name is optional. Tracked it through all init functions: they all handle a NULL name. Updated commit message accordingly. v2->v3: - NetLegacy::id is allowed and takes precedence over NetLegacy::name. Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-07-23hw, net: "net_client_type" -> "NetClientOptionsKind" (qapi-generated)Laszlo Ersek1-8/+8
NET_CLIENT_TYPE_ -> NET_CLIENT_OPTIONS_KIND_ Signed-off-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-06-15qmp: include monitor.h when neededPaolo Bonzini1-0/+1
This is needed to get file descriptors from SCM_RIGHTS. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-06-04net: purge the monitor object from all init functionsLuiz Capitulino1-5/+4
The only backend that really uses it is the socket one, which calls monitor_get_fd(). But it can use 'cur_mon' instead. Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-By: Laszlo Ersek <lersek@redhat.com>
2012-02-01Add support for net bridgeCorey Bryant1-3/+201
The most common use of -net tap is to connect a tap device to a bridge. This requires the use of a script and running qemu as root in order to allocate a tap device to pass to the script. This model is great for portability and flexibility but it's incredibly difficult to eliminate the need to run qemu as root. The only really viable mechanism is to use tunctl to create a tap device, attach it to a bridge as root, and then hand that tap device to qemu. The problem with this mechanism is that it requires administrator intervention whenever a user wants to create a guest. By essentially writing a helper that implements the most common qemu-ifup script that can be safely given cap_net_admin, we can dramatically simplify things for non-privileged users. We still support existing -net tap options as a mechanism for advanced users and backwards compatibility. Currently, this is very Linux centric but there's really no reason why it couldn't be extended for other Unixes. A typical invocation would be similar to one of the following: qemu linux.img -net bridge -net nic,model=virtio qemu linux.img -net tap,helper="/usr/local/libexec/qemu-bridge-helper" -net nic,model=virtio qemu linux.img -netdev bridge,id=hn0 -device virtio-net-pci,netdev=hn0,id=nic1 qemu linux.img -netdev tap,helper="/usr/local/libexec/qemu-bridge-helper",id=hn0 -device virtio-net-pci,netdev=hn0,id=nic1 The default bridge that we attach to is br0. The thinking is that a distro could preconfigure such an interface to allow out-of-the-box bridged networking. Alternatively, if a user wants to use a different bridge, a typical invocation would be simliar to one of the following: qemu linux.img -net bridge,br=qemubr0 -net nic,model=virtio qemu linux.img -net tap,helper="/usr/local/libexec/qemu-bridge-helper --br=qemubr0" -net nic,model=virtio qemu linux.img -netdev bridge,br=qemubr0,id=hn0 -device virtio-net-pci,netdev=hn0,id=nic1 qemu linux.img -netdev tap,helper="/usr/local/libexec/qemu-bridge-helper --br=qemubr0",id=hn0 -device virtio-net-pci,netdev=hn0,id=nic1 Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Richa Marwaha <rmarwah@linux.vnet.ibm.com> Signed-off-by: Corey Bryant <coreyb@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-12-15network scripts: don't block SIGCHLD before forkingMichael Roth1-6/+0
This patch fixes a bug where child processes of launch_script() can misbehave due to SIGCHLD being blocked. In the case of `sudo`, this causes a permanent hang. Previously a SIGCHLD handler was added to reap fork_exec()'d zombie processes by calling waitpid(-1, ...). This required other fork()/waitpid() callers to temporarilly block SIGCHILD to avoid having the final wait status being intercepted by the SIGCHLD handler: 7c3370d4fe3fa6cda8655f109e4659afc8ca4269 Since then, the qemu_add_child_watch() interface was added to allow registration of such processes and reap only from that specific set of PIDs: 4d54ec7898bd951007cb6122d5315584bd41d0c4 As a result, we can now avoid blocking SIGCHLD in launch_script(), so drop that behavior. Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-06-08Fix compilation warning due to missing header for sigaction (followup)Alexandre Raymond1-1/+0
This patch removes all references to signal.h when qemu-common.h is included as they become redundant. Signed-off-by: Alexandre Raymond <cerbere@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2011-02-01vhost: force vhost off for non-MSI guestsmst@redhat.com1-2/+4
When MSI is off, each interrupt needs to be bounced through the io thread when it's set/cleared, so vhost-net causes more context switches and higher CPU utilization than userspace virtio which handles networking in the same thread. We'll need to fix this by adding level irq support in kvm irqfd, for now disable vhost-net in these configurations. Added a vhostforce flag to force vhost-net back on. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-11-16tap: make set_offload a nop after netdev cleanupMichael S. Tsirkin1-1/+5
virtio-net expects set_offload to succeed after peer cleanup. Since we don't have an open fd anymore, make it so. Fixes warning about the failure of offload setting. Reported-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-11-16tap: clear vhost_net backend on cleanupMichael S. Tsirkin1-0/+1
Frontends calling tap_get_vhost_net get an invalid pointer after the peer backend has been deleted. Jason Wang <jasowang@redhat.com> reports this leading to a crash in ack_features when we remove the vhost-net bakend of a virtio nic. The fix is simply to clear the backend pointer. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-09-07tap: add APIs for vnet header lengthMichael S. Tsirkin1-0/+21
Add APIs to control host header length. First user will be vhost-net. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-09-07tap: generalize code for different vnet header lenMichael S. Tsirkin1-14/+14
Make host vnet header length a structure field in preparation for using this support in linux kernel. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2010-04-25Remove dead assignments in various common files, spotted by clang analyzerBlue Swirl1-1/+1
Value stored is never read. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-04-01tap: add API to retrieve vhost net headerMichael S. Tsirkin1-0/+7
will be used by virtio-net for vhost net support Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-04-01tap: add vhost/vhostfd optionsMichael S. Tsirkin1-0/+29
This adds vhost binary option to tap, to enable vhost net accelerator. Default is off for now, we'll be able to make default on long term when we know it's stable. vhostfd option can be used by management, to pass in the fd. Assigning vhostfd implies vhost=on. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-04-01tap: add interface to get device fdMichael S. Tsirkin1-0/+7
Will be used by vhost to attach/detach to backend. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-21Revert "tap: invoke downscript when we exit abnormally"Anthony Liguori1-16/+0
This reverts commit 8af8ce4d6116e3d46ad298ca8fe50d3b515b1aac.
2010-03-19tap: invoke downscript when we exit abnormallyAnthony Liguori1-0/+16
Right now, downscript is not invoked reliably. If you execute 'quit' from the monitor, it won't be invoked. This fixes that by converting tap to use an exit_notifier to execute the downscript. In this case, allowing an exit notifier to include state is critically important for the conversion. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-16error: Replace qemu_error() by error_report()Markus Armbruster1-1/+1
error_report() terminates the message with a newline. Strip it it from its arguments. This fixes a few error messages lacking a newline: net_handle_fd_param()'s "No file descriptor named %s found", and tap_open()'s "vnet_hdr=1 requested, but no kernel support for IFF_VNET_HDR available" (all three versions). There's one place that passes arguments without newlines intentionally: load_vmstate(). Fix it up.
2010-03-16error: Move qemu_error & friends into their own headerMarkus Armbruster1-0/+1
2010-02-19net: Fix bogus "Warning: vlan 0 with no nics" with -deviceMarkus Armbruster1-4/+0
net_check_clients() prints this when an VLAN has host devices, but no guest devices. It uses VLANState members nb_guest_devs and nb_host_devs to keep track of these devices. However, -device does not update nb_guest_devs, only net_init_nic() does that, for -net nic. Check the VLAN clients directly, and remove the counters. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-01-08net: add API to disable/enable pollingMichael S. Tsirkin1-0/+8
When vhost is bound to a backend device, we need to stop polling it when vhost is started, and restart polling when vhost is stopped. Add an API for that for use by vhost, and implement in tap backend. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03net: initialize vnet_hdr in net_init_tap()Mark McLoughlin1-1/+1
net_tap_init() always sets vnet_hdr using qemu_opt_get_bool(), but initialize it in net_init_tap() just to reduce confusion. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03net: remove VLANClientState members now in NetClientInfoMark McLoughlin1-3/+3
Add a NetClientInfo pointer to VLANClientState and use that for the typecode and function pointers. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-12-03net: convert tap to NetClientInfoMark McLoughlin1-37/+45
Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-11-21Avoid segfault on net_tap_init() failureJuergen Lock1-0/+3
Check for fd == -1 there. Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2009-11-09tap: drain queue in tap_send()Mark McLoughlin1-13/+16
Okay, let's try re-enabling the drain-entire-queue behaviour, with a difference - before each subsequent packet, use qemu_can_send_packet() to check that we can send it. This is similar to how we check before polling the tap fd and avoids having to drop a packet if the receiver cannot handle it. This patch should be a performance improvement since we no longer have to go through the mainloop for each packet. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-11-09tap: disable draining queue in one goMark McLoughlin1-16/+13
If qemu_send_packet_async() returns zero, it means the packet has been queued and the sent callback will be invoked once it has been flushed. This is only possible where the NIC's receive() handler returns zero and promises to notify the networking core that room is available in its queue again. In the case where the receive handler does not have this capability (and its queue fills up) it returns -1 and the networking core does not queue up the packet. This condition is indicated by a -1 return from qemu_send_packet_async(). Currently, tap handles this condition simply by dropping the packet. It should do its best to avoid getting into this situation by checking such NIC's have room for a packet before copying the packet from the tap interface. tap_send() used to achieve this by only reading a single packet before returning to the mainloop. That way, tap_can_send() is called before reading each packet. tap_send() was changed to completely drain the tap interface queue without taking into account the situation where the NIC returns an error and the packet is not queued. Let's start fixing this by reverting to the previous behaviour of reading one packet at a time. Reported-by: Scott Tsai <scottt.tw@gmail.com> Tested-by: Sven Rudolph <Sven_Rudolph@drewag.de> Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-30Unbreak tap compilation on OS XAlexander Graf1-0/+1
Currently compiling the tap sources breaks on Mac OS X. This is because of: 1) tap-linux.h requiring Linux includes 2) typos 3) missing #includes This patch adds what's necessary to compile tap happily on Mac OS X. I haven't tested if using tap actually works, but I don't think that's a major issue as that code was probably seriously untested before already. I didn't split the patch, because it's only a few lines of code and splitting is probably not worth the effort here. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-30net: move UFO support detection to tap-linux.cMark McLoughlin1-6/+1
Only supported on Linux Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-30net: move tap_set_offload() code into tap-linux.cMark McLoughlin1-20/+1
TUNSETOFFLOAD is only available on Linux Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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