mirror of https://github.com/ipxe/ipxe.git
377 lines
10 KiB
C
377 lines
10 KiB
C
#ifndef _GPXE_NETDEVICE_H
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#define _GPXE_NETDEVICE_H
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/** @file
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*
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* Network device management
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*
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*/
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#include <stdint.h>
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#include <gpxe/list.h>
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#include <gpxe/tables.h>
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#include <gpxe/refcnt.h>
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struct io_buffer;
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struct net_device;
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struct net_protocol;
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struct ll_protocol;
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struct device;
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/** Maximum length of a link-layer address */
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#define MAX_LL_ADDR_LEN 20
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/** Maximum length of a link-layer header */
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#define MAX_LL_HEADER_LEN 32
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/** Maximum length of a network-layer address */
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#define MAX_NET_ADDR_LEN 4
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/**
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* A network-layer protocol
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*
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*/
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struct net_protocol {
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/** Protocol name */
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const char *name;
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/**
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* Process received packet
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*
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* @v iobuf I/O buffer
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* @v netdev Network device
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* @v ll_source Link-layer source address
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*
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* This method takes ownership of the I/O buffer.
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*/
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int ( * rx ) ( struct io_buffer *iobuf, struct net_device *netdev,
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const void *ll_source );
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/**
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* Transcribe network-layer address
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*
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* @v net_addr Network-layer address
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* @ret string Human-readable transcription of address
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*
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* This method should convert the network-layer address into a
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* human-readable format (e.g. dotted quad notation for IPv4).
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*
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* The buffer used to hold the transcription is statically
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* allocated.
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*/
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const char * ( *ntoa ) ( const void * net_addr );
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/** Network-layer protocol
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*
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* This is an ETH_P_XXX constant, in network-byte order
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*/
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uint16_t net_proto;
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/** Network-layer address length */
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uint8_t net_addr_len;
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};
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/**
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* A link-layer protocol
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*
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*/
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struct ll_protocol {
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/** Protocol name */
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const char *name;
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/**
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* Transmit network-layer packet via network device
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*
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* @v iobuf I/O buffer
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* @v netdev Network device
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* @v net_protocol Network-layer protocol
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* @v ll_dest Link-layer destination address
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* @ret rc Return status code
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*
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* This method should prepend in the link-layer header
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* (e.g. the Ethernet DIX header) and transmit the packet.
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* This method takes ownership of the I/O buffer.
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*/
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int ( * tx ) ( struct io_buffer *iobuf, struct net_device *netdev,
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struct net_protocol *net_protocol,
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const void *ll_dest );
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/**
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* Handle received packet
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*
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* @v iobuf I/O buffer
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* @v netdev Network device
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*
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* This method should strip off the link-layer header
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* (e.g. the Ethernet DIX header) and pass the packet to
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* net_rx(). This method takes ownership of the packet
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* buffer.
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*/
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int ( * rx ) ( struct io_buffer *iobuf, struct net_device *netdev );
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/**
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* Transcribe link-layer address
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*
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* @v ll_addr Link-layer address
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* @ret string Human-readable transcription of address
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*
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* This method should convert the link-layer address into a
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* human-readable format.
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*
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* The buffer used to hold the transcription is statically
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* allocated.
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*/
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const char * ( * ntoa ) ( const void * ll_addr );
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/** Link-layer protocol
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*
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* This is an ARPHRD_XXX constant, in network byte order.
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*/
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uint16_t ll_proto;
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/** Link-layer address length */
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uint8_t ll_addr_len;
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/** Link-layer header length */
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uint8_t ll_header_len;
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/** Link-layer broadcast address */
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const uint8_t *ll_broadcast;
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};
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/** Network device operations */
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struct net_device_operations {
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/** Open network device
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*
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* @v netdev Network device
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* @ret rc Return status code
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*
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* This method should allocate RX I/O buffers and enable
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* the hardware to start transmitting and receiving packets.
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*/
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int ( * open ) ( struct net_device *netdev );
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/** Close network device
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*
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* @v netdev Network device
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*
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* This method should stop the flow of packets, and free up
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* any packets that are currently in the device's TX queue.
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*/
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void ( * close ) ( struct net_device *netdev );
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/** Transmit packet
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*
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* @v netdev Network device
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* @v iobuf I/O buffer
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* @ret rc Return status code
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*
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* This method should cause the hardware to initiate
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* transmission of the I/O buffer.
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*
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* If this method returns success, the I/O buffer remains
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* owned by the net device's TX queue, and the net device must
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* eventually call netdev_tx_complete() to free the buffer.
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* If this method returns failure, the I/O buffer is
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* immediately released; the failure is interpreted as
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* "failure to enqueue buffer".
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*
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* This method is guaranteed to be called only when the device
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* is open.
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*/
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int ( * transmit ) ( struct net_device *netdev,
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struct io_buffer *iobuf );
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/** Poll for completed and received packets
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*
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* @v netdev Network device
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*
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* This method should cause the hardware to check for
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* completed transmissions and received packets. Any received
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* packets should be delivered via netdev_rx().
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*
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* This method is guaranteed to be called only when the device
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* is open.
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*/
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void ( * poll ) ( struct net_device *netdev );
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/** Enable or disable interrupts
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*
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* @v netdev Network device
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* @v enable Interrupts should be enabled
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*/
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void ( * irq ) ( struct net_device *netdev, int enable );
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};
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/** Network device statistics */
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struct net_device_stats {
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/** Count of successfully completed transmissions */
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unsigned int tx_ok;
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/** Count of transmission errors */
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unsigned int tx_err;
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/** Count of successfully received packets */
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unsigned int rx_ok;
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/** Count of reception errors */
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unsigned int rx_err;
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};
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/**
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* A network device
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*
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* This structure represents a piece of networking hardware. It has
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* properties such as a link-layer address and methods for
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* transmitting and receiving raw packets.
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*
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* Note that this structure must represent a generic network device,
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* not just an Ethernet device.
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*/
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struct net_device {
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/** Reference counter */
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struct refcnt refcnt;
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/** List of network devices */
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struct list_head list;
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/** Name of this network device */
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char name[8];
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/** Underlying hardware device */
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struct device *dev;
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/** Network device operations */
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struct net_device_operations *op;
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/** Link-layer protocol */
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struct ll_protocol *ll_protocol;
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/** Link-layer address
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*
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* For Ethernet, this is the MAC address.
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*/
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uint8_t ll_addr[MAX_LL_ADDR_LEN];
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/** Current device state
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*
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* This is the bitwise-OR of zero or more NETDEV_XXX constants.
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*/
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unsigned int state;
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/** TX packet queue */
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struct list_head tx_queue;
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/** RX packet queue */
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struct list_head rx_queue;
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/** Device statistics */
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struct net_device_stats stats;
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/** Driver private data */
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void *priv;
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};
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/** Network device is open */
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#define NETDEV_OPEN 0x0001
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/** Declare a link-layer protocol */
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#define __ll_protocol __table ( struct ll_protocol, ll_protocols, 01 )
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/** Declare a network-layer protocol */
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#define __net_protocol __table ( struct net_protocol, net_protocols, 01 )
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extern struct list_head net_devices;
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extern struct net_device_operations null_netdev_operations;
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/**
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* Initialise a network device
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*
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* @v netdev Network device
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* @v op Network device operations
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*/
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static inline void netdev_init ( struct net_device *netdev,
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struct net_device_operations *op ) {
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netdev->op = op;
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}
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/**
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* Stop using a network device
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*
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* @v netdev Network device
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*
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* Drivers should call this method immediately before the final call
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* to netdev_put().
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*/
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static inline void netdev_nullify ( struct net_device *netdev ) {
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netdev->op = &null_netdev_operations;
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}
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/**
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* Get printable network device hardware address
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*
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* @v netdev Network device
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* @ret name Hardware address
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*/
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static inline const char * netdev_hwaddr ( struct net_device *netdev ) {
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return netdev->ll_protocol->ntoa ( netdev->ll_addr );
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}
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/** Iterate over all network devices */
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#define for_each_netdev( netdev ) \
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list_for_each_entry ( (netdev), &net_devices, list )
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/** There exist some network devices
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*
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* @ret existence Existence of network devices
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*/
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static inline int have_netdevs ( void ) {
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return ( ! list_empty ( &net_devices ) );
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}
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/**
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* Get reference to network device
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*
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* @v netdev Network device
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* @ret netdev Network device
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*/
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static inline __attribute__ (( always_inline )) struct net_device *
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netdev_get ( struct net_device *netdev ) {
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ref_get ( &netdev->refcnt );
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return netdev;
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}
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/**
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* Drop reference to network device
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*
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* @v netdev Network device
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*/
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static inline __attribute__ (( always_inline )) void
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netdev_put ( struct net_device *netdev ) {
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ref_put ( &netdev->refcnt );
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}
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extern int netdev_tx ( struct net_device *netdev, struct io_buffer *iobuf );
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extern void netdev_tx_complete_err ( struct net_device *netdev,
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struct io_buffer *iobuf, int rc );
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extern void netdev_tx_complete_next_err ( struct net_device *netdev, int rc );
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extern void netdev_rx ( struct net_device *netdev, struct io_buffer *iobuf );
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extern void netdev_rx_err ( struct net_device *netdev,
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struct io_buffer *iobuf, int rc );
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extern void netdev_poll ( struct net_device *netdev );
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extern struct io_buffer * netdev_rx_dequeue ( struct net_device *netdev );
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extern struct net_device * alloc_netdev ( size_t priv_size );
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extern int register_netdev ( struct net_device *netdev );
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extern int netdev_open ( struct net_device *netdev );
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extern void netdev_close ( struct net_device *netdev );
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extern void unregister_netdev ( struct net_device *netdev );
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extern void netdev_irq ( struct net_device *netdev, int enable );
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extern struct net_device * find_netdev ( const char *name );
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extern struct net_device * find_netdev_by_location ( unsigned int bus_type,
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unsigned int location );
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extern int net_tx ( struct io_buffer *iobuf, struct net_device *netdev,
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struct net_protocol *net_protocol, const void *ll_dest );
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extern int net_rx ( struct io_buffer *iobuf, struct net_device *netdev,
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uint16_t net_proto, const void *ll_source );
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/**
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* Complete network transmission
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*
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* @v netdev Network device
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* @v iobuf I/O buffer
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*
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* The packet must currently be in the network device's TX queue.
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*/
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static inline void netdev_tx_complete ( struct net_device *netdev,
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struct io_buffer *iobuf ) {
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netdev_tx_complete_err ( netdev, iobuf, 0 );
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}
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/**
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* Complete network transmission
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*
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* @v netdev Network device
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*
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* Completes the oldest outstanding packet in the TX queue.
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*/
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static inline void netdev_tx_complete_next ( struct net_device *netdev ) {
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netdev_tx_complete_next_err ( netdev, 0 );
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}
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#endif /* _GPXE_NETDEVICE_H */
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