--- /dev/null
+// 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,
+};
--- /dev/null
+/* 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 */
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