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virtio: Add net driver support

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This adds virtio net device driver support.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Tuomas Tynkkynen 2018-10-15 02:21:03 -07:00 committed by Simon Glass
parent fdc4aca89e
commit f371ad3064
4 changed files with 494 additions and 0 deletions
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7
drivers/virtio/Kconfig
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@ -29,4 +29,11 @@ config VIRTIO_MMIO
This driver provides support for memory mapped virtio
platform device driver.
config VIRTIO_NET
bool "virtio net driver"
depends on VIRTIO
help
This is the virtual net driver for virtio. It can be used with
QEMU based targets.
endmenu

1
drivers/virtio/Makefile
View file

@ -5,3 +5,4 @@
obj-y += virtio-uclass.o virtio_ring.o
obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o

218
drivers/virtio/virtio_net.c Normal file
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@ -0,0 +1,218 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <net.h>
#include <virtio_types.h>
#include <virtio.h>
#include <virtio_ring.h>
#include "virtio_net.h"
/* Amount of buffers to keep in the RX virtqueue */
#define VIRTIO_NET_NUM_RX_BUFS 32
/*
* This value comes from the VirtIO spec: 1500 for maximum packet size,
* 14 for the Ethernet header, 12 for virtio_net_hdr. In total 1526 bytes.
*/
#define VIRTIO_NET_RX_BUF_SIZE 1526
struct virtio_net_priv {
union {
struct virtqueue *vqs[2];
struct {
struct virtqueue *rx_vq;
struct virtqueue *tx_vq;
};
};
char rx_buff[VIRTIO_NET_NUM_RX_BUFS][VIRTIO_NET_RX_BUF_SIZE];
bool rx_running;
};
/*
* For simplicity, the driver only negotiates the VIRTIO_NET_F_MAC feature.
* For the VIRTIO_NET_F_STATUS feature, we don't negotiate it, hence per spec
* we should assume the link is always active.
*/
static const u32 feature[] = {
VIRTIO_NET_F_MAC
};
static const u32 feature_legacy[] = {
VIRTIO_NET_F_MAC
};
static int virtio_net_start(struct udevice *dev)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
struct virtio_sg sg;
struct virtio_sg *sgs[] = { &sg };
int i;
if (!priv->rx_running) {
/* receive buffer length is always 1526 */
sg.length = VIRTIO_NET_RX_BUF_SIZE;
/* setup the receive buffer address */
for (i = 0; i < VIRTIO_NET_NUM_RX_BUFS; i++) {
sg.addr = priv->rx_buff[i];
virtqueue_add(priv->rx_vq, sgs, 0, 1);
}
virtqueue_kick(priv->rx_vq);
/* setup the receive queue only once */
priv->rx_running = true;
}
return 0;
}
static int virtio_net_send(struct udevice *dev, void *packet, int length)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
struct virtio_net_hdr hdr;
struct virtio_sg hdr_sg = { &hdr, sizeof(hdr) };
struct virtio_sg data_sg = { packet, length };
struct virtio_sg *sgs[] = { &hdr_sg, &data_sg };
int ret;
memset(&hdr, 0, sizeof(struct virtio_net_hdr));
ret = virtqueue_add(priv->tx_vq, sgs, 2, 0);
if (ret)
return ret;
virtqueue_kick(priv->tx_vq);
while (1) {
if (virtqueue_get_buf(priv->tx_vq, NULL))
break;
}
return 0;
}
static int virtio_net_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
unsigned int len;
void *buf;
buf = virtqueue_get_buf(priv->rx_vq, &len);
if (!buf)
return -EAGAIN;
*packetp = buf + sizeof(struct virtio_net_hdr);
return len - sizeof(struct virtio_net_hdr);
}
static int virtio_net_free_pkt(struct udevice *dev, uchar *packet, int length)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
void *buf = packet - sizeof(struct virtio_net_hdr);
struct virtio_sg sg = { buf, VIRTIO_NET_RX_BUF_SIZE };
struct virtio_sg *sgs[] = { &sg };
/* Put the buffer back to the rx ring */
virtqueue_add(priv->rx_vq, sgs, 0, 1);
return 0;
}
static void virtio_net_stop(struct udevice *dev)
{
/*
* There is no way to stop the queue from running, unless we issue
* a reset to the virtio device, and re-do the queue initialization
* from the beginning.
*/
}
static int virtio_net_write_hwaddr(struct udevice *dev)
{
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
struct eth_pdata *pdata = dev_get_platdata(dev);
int i;
/*
* v1.0 compliant device's MAC address is set through control channel,
* which we don't support for now.
*/
if (!uc_priv->legacy)
return -ENOSYS;
for (i = 0; i < sizeof(pdata->enetaddr); i++) {
virtio_cwrite8(dev,
offsetof(struct virtio_net_config, mac) + i,
pdata->enetaddr[i]);
}
return 0;
}
static int virtio_net_read_rom_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_platdata(dev);
if (!pdata)
return -ENOSYS;
if (virtio_has_feature(dev, VIRTIO_NET_F_MAC)) {
virtio_cread_bytes(dev,
offsetof(struct virtio_net_config, mac),
pdata->enetaddr, sizeof(pdata->enetaddr));
}
return 0;
}
static int virtio_net_bind(struct udevice *dev)
{
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
/* Indicate what driver features we support */
virtio_driver_features_init(uc_priv, feature, ARRAY_SIZE(feature),
feature_legacy, ARRAY_SIZE(feature_legacy));
return 0;
}
static int virtio_net_probe(struct udevice *dev)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
int ret;
ret = virtio_find_vqs(dev, 2, priv->vqs);
if (ret < 0)
return ret;
return 0;
}
static const struct eth_ops virtio_net_ops = {
.start = virtio_net_start,
.send = virtio_net_send,
.recv = virtio_net_recv,
.free_pkt = virtio_net_free_pkt,
.stop = virtio_net_stop,
.write_hwaddr = virtio_net_write_hwaddr,
.read_rom_hwaddr = virtio_net_read_rom_hwaddr,
};
U_BOOT_DRIVER(virtio_net) = {
.name = VIRTIO_NET_DRV_NAME,
.id = UCLASS_ETH,
.bind = virtio_net_bind,
.probe = virtio_net_probe,
.remove = virtio_reset,
.ops = &virtio_net_ops,
.priv_auto_alloc_size = sizeof(struct virtio_net_priv),
.platdata_auto_alloc_size = sizeof(struct eth_pdata),
.flags = DM_FLAG_ACTIVE_DMA,
};

268
drivers/virtio/virtio_net.h Normal file
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@ -0,0 +1,268 @@
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*
* From Linux kernel include/uapi/linux/virtio_net.h
*/
#ifndef _LINUX_VIRTIO_NET_H
#define _LINUX_VIRTIO_NET_H
/* TODO: needs to be removed! */
#define ETH_ALEN 6
/* The feature bitmap for virtio net */
/* Host handles pkts w/ partial csum */
#define VIRTIO_NET_F_CSUM 0
/* Guest handles pkts w/ partial csum */
#define VIRTIO_NET_F_GUEST_CSUM 1
/* Dynamic offload configuration */
#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
/* Initial MTU advice */
#define VIRTIO_NET_F_MTU 3
/* Host has given MAC address */
#define VIRTIO_NET_F_MAC 5
/* Guest can handle TSOv4 in */
#define VIRTIO_NET_F_GUEST_TSO4 7
/* Guest can handle TSOv6 in */
#define VIRTIO_NET_F_GUEST_TSO6 8
/* Guest can handle TSO[6] w/ ECN in */
#define VIRTIO_NET_F_GUEST_ECN 9
/* Guest can handle UFO in */
#define VIRTIO_NET_F_GUEST_UFO 10
/* Host can handle TSOv4 in */
#define VIRTIO_NET_F_HOST_TSO4 11
/* Host can handle TSOv6 in */
#define VIRTIO_NET_F_HOST_TSO6 12
/* Host can handle TSO[6] w/ ECN in */
#define VIRTIO_NET_F_HOST_ECN 13
/* Host can handle UFO in */
#define VIRTIO_NET_F_HOST_UFO 14
/* Host can merge receive buffers */
#define VIRTIO_NET_F_MRG_RXBUF 15
/* virtio_net_config.status available */
#define VIRTIO_NET_F_STATUS 16
/* Control channel available */
#define VIRTIO_NET_F_CTRL_VQ 17
/* Control channel RX mode support */
#define VIRTIO_NET_F_CTRL_RX 18
/* Control channel VLAN filtering */
#define VIRTIO_NET_F_CTRL_VLAN 19
/* Extra RX mode control support */
#define VIRTIO_NET_F_CTRL_RX_EXTRA 20
/* Guest can announce device on the network */
#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
/* Device supports receive flow steering */
#define VIRTIO_NET_F_MQ 22
/* Set MAC address */
#define VIRTIO_NET_F_CTRL_MAC_ADDR 23
/* Device set linkspeed and duplex */
#define VIRTIO_NET_F_SPEED_DUPLEX 63
#ifndef VIRTIO_NET_NO_LEGACY
/* Host handles pkts w/ any GSO type */
#define VIRTIO_NET_F_GSO 6
#endif /* VIRTIO_NET_NO_LEGACY */
#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
struct __packed virtio_net_config {
/* The config defining mac address (if VIRTIO_NET_F_MAC) */
__u8 mac[ETH_ALEN];
/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
__u16 status;
/*
* Maximum number of each of transmit and receive queues;
* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
* Legal values are between 1 and 0x8000
*/
__u16 max_virtqueue_pairs;
/* Default maximum transmit unit advice */
__u16 mtu;
/*
* speed, in units of 1Mb. All values 0 to INT_MAX are legal.
* Any other value stands for unknown.
*/
__u32 speed;
/*
* 0x00 - half duplex
* 0x01 - full duplex
* Any other value stands for unknown.
*/
__u8 duplex;
};
/*
* This header comes first in the scatter-gather list. If you don't
* specify GSO or CSUM features, you can simply ignore the header.
*
* This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
* only flattened.
*/
struct virtio_net_hdr_v1 {
#define VIRTIO_NET_HDR_F_NEEDS_CSUM 0x01 /* Use csum_start, csum_offset */
#define VIRTIO_NET_HDR_F_DATA_VALID 0x02 /* Csum is valid */
__u8 flags;
#define VIRTIO_NET_HDR_GSO_NONE 0x00 /* Not a GSO frame */
#define VIRTIO_NET_HDR_GSO_TCPV4 0x01 /* GSO frame, IPv4 TCP (TSO) */
#define VIRTIO_NET_HDR_GSO_UDP 0x03 /* GSO frame, IPv4 UDP (UFO) */
#define VIRTIO_NET_HDR_GSO_TCPV6 0x04 /* GSO frame, IPv6 TCP */
#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
__u8 gso_type;
__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
__virtio16 csum_start; /* Position to start checksumming from */
__virtio16 csum_offset; /* Offset after that to place checksum */
__virtio16 num_buffers; /* Number of merged rx buffers */
};
#ifndef VIRTIO_NET_NO_LEGACY
/*
* This header comes first in the scatter-gather list.
*
* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
* be the first element of the scatter-gather list. If you don't
* specify GSO or CSUM features, you can simply ignore the header.
*/
struct virtio_net_hdr {
/* See VIRTIO_NET_HDR_F_* */
__u8 flags;
/* See VIRTIO_NET_HDR_GSO_* */
__u8 gso_type;
__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
__virtio16 csum_start; /* Position to start checksumming from */
__virtio16 csum_offset; /* Offset after that to place checksum */
};
/*
* This is the version of the header to use when the MRG_RXBUF
* feature has been negotiated.
*/
struct virtio_net_hdr_mrg_rxbuf {
struct virtio_net_hdr hdr;
__virtio16 num_buffers; /* Number of merged rx buffers */
};
#endif /* ...VIRTIO_NET_NO_LEGACY */
/*
* Control virtqueue data structures
*
* The control virtqueue expects a header in the first sg entry
* and an ack/status response in the last entry. Data for the
* command goes in between.
*/
struct __packed virtio_net_ctrl_hdr {
__u8 class;
__u8 cmd;
};
typedef __u8 virtio_net_ctrl_ack;
#define VIRTIO_NET_OK 0
#define VIRTIO_NET_ERR 1
/*
* Control the RX mode, ie. promisucous, allmulti, etc...
*
* All commands require an "out" sg entry containing a 1 byte state value,
* zero = disable, non-zero = enable.
*
* Commands 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
*/
#define VIRTIO_NET_CTRL_RX 0
#define VIRTIO_NET_CTRL_RX_PROMISC 0
#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
#define VIRTIO_NET_CTRL_RX_ALLUNI 2
#define VIRTIO_NET_CTRL_RX_NOMULTI 3
#define VIRTIO_NET_CTRL_RX_NOUNI 4
#define VIRTIO_NET_CTRL_RX_NOBCAST 5
/*
* Control the MAC
*
* The MAC filter table is managed by the hypervisor, the guest should assume
* the size is infinite. Filtering should be considered non-perfect, ie. based
* on hypervisor resources, the guest may received packets from sources not
* specified in the filter list.
*
* In addition to the class/cmd header, the TABLE_SET command requires two
* out scatterlists. Each contains a 4 byte count of entries followed by a
* concatenated byte stream of the ETH_ALEN MAC addresses. The first sg list
* contains unicast addresses, the second is for multicast. This functionality
* is present if the VIRTIO_NET_F_CTRL_RX feature is available.
*
* The ADDR_SET command requests one out scatterlist, it contains a 6 bytes MAC
* address. This functionality is present if the VIRTIO_NET_F_CTRL_MAC_ADDR
* feature is available.
*/
struct __packed virtio_net_ctrl_mac {
__virtio32 entries;
__u8 macs[][ETH_ALEN];
};
#define VIRTIO_NET_CTRL_MAC 1
#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
/*
* Control VLAN filtering
*
* The VLAN filter table is controlled via a simple ADD/DEL interface. VLAN IDs
* not added may be filterd by the hypervisor. Del is the opposite of add. Both
* commands expect an out entry containing a 2 byte VLAN ID. VLAN filterting is
* available with the VIRTIO_NET_F_CTRL_VLAN feature bit.
*/
#define VIRTIO_NET_CTRL_VLAN 2
#define VIRTIO_NET_CTRL_VLAN_ADD 0
#define VIRTIO_NET_CTRL_VLAN_DEL 1
/*
* Control link announce acknowledgment
*
* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that driver has
* recevied the notification; device would clear the VIRTIO_NET_S_ANNOUNCE bit
* in the status field after it receives this command.
*/
#define VIRTIO_NET_CTRL_ANNOUNCE 3
#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
/*
* Control receive flow steering
*
* The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables receive flow steering,
* specifying the number of the transmit and receive queues that will be used.
* After the command is consumed and acked by the device, the device will not
* steer new packets on receive virtqueues other than specified nor read from
* transmit virtqueues other than specified. Accordingly, driver should not
* transmit new packets on virtqueues other than specified.
*/
struct virtio_net_ctrl_mq {
__virtio16 virtqueue_pairs;
};
#define VIRTIO_NET_CTRL_MQ 4
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
/*
* Control network offloads
*
* Reconfigures the network offloads that guest can handle.
*
* Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
*
* Command data format matches the feature bit mask exactly.
*
* See VIRTIO_NET_F_GUEST_* for the list of offloads
* that can be enabled/disabled.
*/
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
#endif /* _LINUX_VIRTIO_NET_H */