Simple class for accessing a virtio net device. More...

#include <virtio-net>

Inheritance diagram for L4virtio::Driver::Virtio_net_device:

Collaboration diagram for L4virtio::Driver::Virtio_net_device:

Data Structures
struct	Packet
	Structure for a network packet (header including data) with maximum size, assuming that no extra features have been negotiated. More...

Public Member Functions
int	rx_queue_size () const
	Return the maximum receive queue size allowed by the device.

int	tx_queue_size () const
	Return the maximum transmit queue size allowed by the device.

void	setup_device (L4::Cap< L4virtio::Device > srvcap)
	Establish a connection to the device and set up shared memory.

l4virtio_net_config_t const &	device_config () const
	Return a reference to the device configuration.

Packet &	rx_pkt (l4_uint16_t descno)
	Return a reference to the RX packet buffer of the specified descriptor, e.g.

l4_uint16_t	wait_rx (l4_uint32_t *len=nullptr)
	Block until a network packet has been received from the device and return the descriptor number.

void	finish_rx (l4_uint16_t descno)
	Free an RX descriptor number to make it available for the RX queue again.

void	queue_rx ()
	Queue new available descriptors in the RX queue.

bool	tx (std::function< l4_uint32_t(Packet &)> prepare)
	Attempt to allocate a descriptor in the TX queue and transmit the packet, after calling the prepare callback.

Public Member Functions inherited from L4virtio::Driver::Device
void	driver_connect (L4::Cap< L4virtio::Device > srvcap, bool manage_notify=true)
	Contacts the device and starts the initial handshake.

int	bind_notification_irq (unsigned index, L4::Cap< L4::Triggerable > irq) const
	Register a triggerable to receive notifications from the device.

bool	fail_state () const
	Return true if the device is in a fail state.

bool	feature_negotiated (unsigned int feat) const
	Check if a particular feature bit was negotiated with the device.

int	driver_acknowledge ()
	Finalize handshake with the device.

int	register_ds (L4::Cap< L4Re::Dataspace > ds, l4_umword_t offset, l4_umword_t size, l4_uint64_t *devaddr)
	Share a dataspace with the device.

int	config_queue (int num, unsigned size, l4_uint64_t desc_addr, l4_uint64_t avail_addr, l4_uint64_t used_addr)
	Send the virtqueue configuration to the device.

int	max_queue_size (int num) const
	Maximum queue size allowed by the device.

int	send_and_wait (Virtqueue &queue, l4_uint16_t descno)
	Send a request to the device and wait for it to be processed.

int	wait (int index) const
	Wait for a notification from the device.

int	wait_for_next_used (Virtqueue &queue, l4_uint32_t *len=nullptr) const
	Wait for the next item to arrive in the used queue and return it.

void	send (Virtqueue &queue, l4_uint16_t descno)
	Send a request to the device.

Detailed Description

Simple class for accessing a virtio net device.

Definition at line 30 of file virtio-net.

Member Function Documentation

◆ finish_rx()

void L4virtio::Driver::Virtio_net_device::finish_rx ( l4_uint16_t descno )

inline

Free an RX descriptor number to make it available for the RX queue again.

Parameters

descno Descriptor number in the virtio queue.

Usually queue_rx() should be called afterwards to queue the freed descriptor(s).

Definition at line 194 of file virtio-net.

References L4virtio::Driver::Virtqueue::free_descriptor().

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◆ rx_pkt()

Packet & L4virtio::Driver::Virtio_net_device::rx_pkt ( l4_uint16_t descno )

inline

Return a reference to the RX packet buffer of the specified descriptor, e.g.

from wait_rx().

Parameters

descno Descriptor number in the virtio queue.

Definition at line 158 of file virtio-net.

References L4virtio::Virtqueue::num().

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◆ rx_queue_size()

int L4virtio::Driver::Virtio_net_device::rx_queue_size ( ) const

inline

Return the maximum receive queue size allowed by the device.

wait_rx() will return a descriptor number that is smaller than this size.

Definition at line 47 of file virtio-net.

References L4virtio::Driver::Device::max_queue_size().

Referenced by setup_device().

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◆ setup_device()

void L4virtio::Driver::Virtio_net_device::setup_device ( L4::Cap< L4virtio::Device > srvcap )

inline

Establish a connection to the device and set up shared memory.

Parameters

srvcap IPC capability of the channel to the server.

This function starts a handshake with the device and sets up the virtqueues for communication and the additional data structures for the network device.

Definition at line 66 of file virtio-net.

References L4virtio::Virtqueue::Desc::addr, L4virtio::Virtqueue::avail_offset(), L4Re::chkcap(), L4Re::chksys(), L4virtio::Driver::Device::config_queue(), L4Re::Mem_alloc::Continuous, L4virtio::Driver::Virtqueue::desc(), L4virtio::Driver::Device::driver_acknowledge(), L4virtio::Driver::Device::driver_connect(), L4Re::Env::env(), L4Re::Rm::Unique_region< T >::get(), L4virtio::Driver::Virtqueue::init_queue(), L4_EINVAL, L4_ENODEV, L4_PAGESHIFT, l4_round_size(), L4VIRTIO_FEATURE_VERSION_1, L4VIRTIO_ID_NET, l4virtio_set_feature(), L4::Ipc::make_cap_rw(), L4Re::Mem_alloc::Pinned, L4virtio::Driver::Device::register_ds(), L4Re::Rm::F::RW, rx_queue_size(), L4Re::Rm::F::Search_addr, L4virtio::Virtqueue::total_size(), tx_queue_size(), and L4virtio::Virtqueue::used_offset().

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◆ tx()

bool L4virtio::Driver::Virtio_net_device::tx ( std::function< l4_uint32_t(Packet &)> prepare )

inline

Attempt to allocate a descriptor in the TX queue and transmit the packet, after calling the prepare callback.

Parameters

prepare Function that fills the packet with data, should return the length of the data copied to the packet.

Return values

true	The packet was queued.
false	TX queue is full.

The prepare callback should fill the packet with data and return the length of the packet data (without the size of the virtio-net packet header).

Definition at line 224 of file virtio-net.

References L4virtio::Driver::Virtqueue::alloc_descriptor(), L4virtio::Driver::Virtqueue::desc(), L4virtio::Virtqueue::Desc::len, and L4virtio::Driver::Device::send().

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◆ tx_queue_size()

int L4virtio::Driver::Virtio_net_device::tx_queue_size ( ) const

inline

Return the maximum transmit queue size allowed by the device.

tx() will fail if the amount of queued packets exceeds this size.

Definition at line 54 of file virtio-net.

References L4virtio::Driver::Device::max_queue_size().

Referenced by setup_device().

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◆ wait_rx()

l4_uint16_t L4virtio::Driver::Virtio_net_device::wait_rx ( l4_uint32_t * len = nullptr )

inline

Block until a network packet has been received from the device and return the descriptor number.

Parameters

[out] len (optional) Length of valid data in RX packet.

Returns: Descriptor number of received packet.

The packet data can be obtained with rx_pkt(). finish_rx() should be called after the packet buffer can be returned to the RX queue.

Definition at line 176 of file virtio-net.

References L4Re::chksys(), cxx::min(), and L4virtio::Driver::Device::wait_for_next_used().

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The documentation for this class was generated from the following file:

l4/l4virtio/client/virtio-net

Data Structures

Public Member Functions

Detailed Description

Member Function Documentation

◆ finish_rx()

◆ rx_pkt()

◆ rx_queue_size()

◆ setup_device()

◆ tx()

◆ tx_queue_size()

◆ wait_rx()