virtio_net.c File Reference

#include <miniOS/drivers/virtio_net.h>
#include <miniOS/drivers/pci.h>
#include <miniOS/arch/x86_64/port.h>
#include <miniOS/mm/pmm.h>
#include <miniOS/mm/vmm.h>
#include <miniOS/net/netdev.h>
#include <miniOS/net/ethernet.h>
#include <miniOS/io.h>
#include <string.h>

Include dependency graph for virtio_net.c:

Classes
struct	virtq_desc
struct	virtq_avail
struct	virtq_used_elem
struct	virtq_used
struct	virtio_net_hdr
struct	vnet_queue_t
struct	vnet_state_t

Macros
#define	VIRTIO_VENDOR_ID   0x1AF4u
#define	VIRTIO_NET_DEVICE_ID   0x1000u
#define	VREG_DEVICE_FEATURES   0x00u /* 32-bit RO */
#define	VREG_GUEST_FEATURES   0x04u /* 32-bit WO */
#define	VREG_QUEUE_PFN   0x08u /* 32-bit RW: physical frame number of queue */
#define	VREG_QUEUE_SIZE   0x0Cu /* 16-bit RO: number of descriptors */
#define	VREG_QUEUE_SELECT   0x0Eu /* 16-bit WO: select queue index */
#define	VREG_QUEUE_NOTIFY   0x10u /* 16-bit WO: kick queue */
#define	VREG_DEVICE_STATUS   0x12u /* 8-bit RW: device status byte */
#define	VREG_ISR_STATUS   0x13u /* 8-bit RO, clears on read */
#define	VREG_NET_MAC   0x14u /* 6 bytes: MAC address */
#define	VREG_NET_STATUS   0x1Au /* 16-bit RO: link status */
#define	VSTAT_ACKNOWLEDGE   0x01u
#define	VSTAT_DRIVER   0x02u
#define	VSTAT_DRIVER_OK   0x04u
#define	VIRTIO_NET_F_MAC   (1u << 5)
#define	VIRTQ_DESC_F_NEXT   0x1u /* descriptor chains to .next */
#define	VIRTQ_DESC_F_WRITE   0x2u /* device writes into buffer (RX) */
#define	VNET_QUEUE_SIZE   256u /* must match device-reported QueueSize */
#define	VNET_QUEUE_MASK   (VNET_QUEUE_SIZE - 1u)
#define	VNET_QUEUE_PAGES   3u /* 3 pages for N=256 layout */
#define	VNET_RX_SLOTS   64u /* pre-filled RX descriptors (≤ VNET_QUEUE_SIZE) */
#define	VIRTIO_NET_HDR_LEN   10u
#define	VNET_RXBUF_SIZE   (VIRTIO_NET_HDR_LEN + 1518u)
#define	VNET_DESC_OFFSET   0u
#define	VNET_AVAIL_OFFSET   (sizeof(struct virtq_desc) * VNET_QUEUE_SIZE) /* 4096 */
#define	VNET_USED_OFFSET   8192u /* page-aligned: align(4096+520,4096)=8192 */

Functions
struct virtq_desc	__attribute__ ((packed))
static void	vnet_out8 (uint16_t reg, uint8_t v)
static void	vnet_out16 (uint16_t reg, uint16_t v)
static void	vnet_out32 (uint16_t reg, uint32_t v)
static uint8_t	vnet_in8 (uint16_t reg)
static uint16_t	vnet_in16 (uint16_t reg)
static int	vnet_setup_queue (vnet_queue_t *q, uint16_t queue_idx)
static void	vnet_rxq_fill (void)
static int	vnet_open (netdev_t *dev)
static int	vnet_get_mac (netdev_t *dev, uint8_t mac_out[6])
static bool	vnet_get_link (netdev_t *dev)
static int	vnet_xmit (netdev_t *dev, const void *frame, size_t frame_len)
static int	vnet_poll (netdev_t *dev)
int	virtio_net_probe_and_init (void)

Variables
typedef	__attribute__
uint64_t	addr
uint32_t	len
uint16_t	flags
uint16_t	next
uint16_t	idx
uint16_t	ring [VNET_QUEUE_SIZE]
uint16_t	used_event
uint32_t	id
uint16_t	avail_event
uint8_t	gso_type
uint16_t	hdr_len
uint16_t	gso_size
uint16_t	csum_start
uint16_t	csum_offset
static uint8_t	g_rx_bufs [VNET_RX_SLOTS][VNET_RXBUF_SIZE]
static uint8_t	g_tx_buf [VIRTIO_NET_HDR_LEN+NET_MAX_FRAME_SIZE]
static vnet_state_t	g_vnet_state
static netdev_t	g_vnet_netdev
static const netdev_ops_t	g_vnet_ops

Macro Definition Documentation

VIRTIO_NET_DEVICE_ID

#define VIRTIO_NET_DEVICE_ID   0x1000u

VIRTIO_NET_F_MAC

#define VIRTIO_NET_F_MAC   (1u << 5)

VIRTIO_NET_HDR_LEN

#define VIRTIO_NET_HDR_LEN   10u

VIRTIO_VENDOR_ID

#define VIRTIO_VENDOR_ID   0x1AF4u

VIRTQ_DESC_F_NEXT

#define VIRTQ_DESC_F_NEXT   0x1u /* descriptor chains to .next */

VIRTQ_DESC_F_WRITE

#define VIRTQ_DESC_F_WRITE   0x2u /* device writes into buffer (RX) */

VNET_AVAIL_OFFSET

#define VNET_AVAIL_OFFSET   (sizeof(struct virtq_desc) * VNET_QUEUE_SIZE) /* 4096 */

VNET_DESC_OFFSET

#define VNET_DESC_OFFSET   0u

VNET_QUEUE_MASK

#define VNET_QUEUE_MASK   (VNET_QUEUE_SIZE - 1u)

VNET_QUEUE_PAGES

#define VNET_QUEUE_PAGES   3u /* 3 pages for N=256 layout */

VNET_QUEUE_SIZE

#define VNET_QUEUE_SIZE   256u /* must match device-reported QueueSize */

VNET_RX_SLOTS

#define VNET_RX_SLOTS   64u /* pre-filled RX descriptors (≤ VNET_QUEUE_SIZE) */

VNET_RXBUF_SIZE

#define VNET_RXBUF_SIZE   (VIRTIO_NET_HDR_LEN + 1518u)

VNET_USED_OFFSET

#define VNET_USED_OFFSET   8192u /* page-aligned: align(4096+520,4096)=8192 */

VREG_DEVICE_FEATURES

#define VREG_DEVICE_FEATURES   0x00u /* 32-bit RO */

VREG_DEVICE_STATUS

#define VREG_DEVICE_STATUS   0x12u /* 8-bit RW: device status byte */

VREG_GUEST_FEATURES

#define VREG_GUEST_FEATURES   0x04u /* 32-bit WO */

VREG_ISR_STATUS

#define VREG_ISR_STATUS   0x13u /* 8-bit RO, clears on read */

VREG_NET_MAC

#define VREG_NET_MAC   0x14u /* 6 bytes: MAC address */

VREG_NET_STATUS

#define VREG_NET_STATUS   0x1Au /* 16-bit RO: link status */

VREG_QUEUE_NOTIFY

#define VREG_QUEUE_NOTIFY   0x10u /* 16-bit WO: kick queue */

VREG_QUEUE_PFN

#define VREG_QUEUE_PFN   0x08u /* 32-bit RW: physical frame number of queue */

VREG_QUEUE_SELECT

#define VREG_QUEUE_SELECT   0x0Eu /* 16-bit WO: select queue index */

VREG_QUEUE_SIZE

#define VREG_QUEUE_SIZE   0x0Cu /* 16-bit RO: number of descriptors */

VSTAT_ACKNOWLEDGE

#define VSTAT_ACKNOWLEDGE   0x01u

VSTAT_DRIVER

#define VSTAT_DRIVER   0x02u

VSTAT_DRIVER_OK

#define VSTAT_DRIVER_OK   0x04u

Function Documentation

__attribute__()

struct virtq_desc __attribute__

(

(packed)

)

virtio_net_probe_and_init()

int virtio_net_probe_and_init

(

void

)

virtio_net_probe_and_init() - Probe PCI bus for a virtio-net device and initialise it.

Scans pci_devices[] for vendor=0x1AF4, device=0x1000. Negotiates legacy virtio features, allocates virtqueues from physically contiguous PMM frames, and registers a netdev_t via netdev_register().

Returns

: 0 on success, -1 if no device found or initialisation failed.

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_get_link()

bool vnet_get_link ( netdev_t * dev )

static

vnet_get_mac()

int vnet_get_mac ( netdev_t * dev, uint8_t mac_out[6] )

static

Here is the call graph for this function:

vnet_in16()

uint16_t vnet_in16 ( uint16_t reg )

inlinestatic

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_in8()

uint8_t vnet_in8 ( uint16_t reg )

inlinestatic

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_open()

int vnet_open ( netdev_t * dev )

static

vnet_out16()

void vnet_out16 ( uint16_t reg, uint16_t v )

inlinestatic

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_out32()

void vnet_out32 ( uint16_t reg, uint32_t v )

inlinestatic

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_out8()

void vnet_out8 ( uint16_t reg, uint8_t v )

inlinestatic

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_poll()

int vnet_poll ( netdev_t * dev )

static

Here is the call graph for this function:

vnet_rxq_fill()

void vnet_rxq_fill ( void )

static

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_setup_queue()

int vnet_setup_queue ( vnet_queue_t * q, uint16_t queue_idx )

static

Here is the call graph for this function:

Here is the caller graph for this function:

vnet_xmit()

int vnet_xmit ( netdev_t * dev, const void * frame, size_t frame_len )

static

Here is the call graph for this function:

Variable Documentation

__attribute__

struct madt_lapic_entry __attribute__

addr

uint64_t addr

avail_event

uint16_t avail_event

csum_offset

uint16_t csum_offset

csum_start

uint16_t csum_start

flags

uint32_t flags

g_rx_bufs

uint8_t g_rx_bufs[VNET_RX_SLOTS][VNET_RXBUF_SIZE]

static

g_tx_buf

uint8_t g_tx_buf[VIRTIO_NET_HDR_LEN+NET_MAX_FRAME_SIZE]

static

g_vnet_netdev

netdev_t g_vnet_netdev

static

g_vnet_ops

const netdev_ops_t g_vnet_ops

static

Initial value:

                                     = {
    .open     = vnet_open,
    .poll     = vnet_poll,
    .xmit     = vnet_xmit,
    .get_mac  = vnet_get_mac,
    .get_link = vnet_get_link,
}

g_vnet_state

vnet_state_t g_vnet_state

static

gso_size

uint16_t gso_size

gso_type

uint8_t gso_type

hdr_len

uint16_t hdr_len

id

uint32_t id

idx

uint16_t idx

len

uint32_t len

next

uint16_t next

ring

struct virtq_used_elem ring

used_event

uint16_t used_event