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https://github.com/AsahiLinux/u-boot
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virtio: Add net driver support
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
Simon Glass
parent
fdc4aca89e
commit
f371ad3064
4 changed files with 494 additions and 0 deletions
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@ -29,4 +29,11 @@ config VIRTIO_MMIO
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This driver provides support for memory mapped virtio
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platform device driver.
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config VIRTIO_NET
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bool "virtio net driver"
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depends on VIRTIO
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help
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This is the virtual net driver for virtio. It can be used with
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QEMU based targets.
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endmenu
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@ -5,3 +5,4 @@
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obj-y += virtio-uclass.o virtio_ring.o
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obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
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obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
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218
drivers/virtio/virtio_net.c
Normal file
218
drivers/virtio/virtio_net.c
Normal file
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@ -0,0 +1,218 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <net.h>
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#include <virtio_types.h>
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#include <virtio.h>
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#include <virtio_ring.h>
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#include "virtio_net.h"
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/* Amount of buffers to keep in the RX virtqueue */
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#define VIRTIO_NET_NUM_RX_BUFS 32
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/*
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* This value comes from the VirtIO spec: 1500 for maximum packet size,
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* 14 for the Ethernet header, 12 for virtio_net_hdr. In total 1526 bytes.
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*/
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#define VIRTIO_NET_RX_BUF_SIZE 1526
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struct virtio_net_priv {
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union {
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struct virtqueue *vqs[2];
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struct {
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struct virtqueue *rx_vq;
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struct virtqueue *tx_vq;
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};
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};
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char rx_buff[VIRTIO_NET_NUM_RX_BUFS][VIRTIO_NET_RX_BUF_SIZE];
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bool rx_running;
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};
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/*
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* For simplicity, the driver only negotiates the VIRTIO_NET_F_MAC feature.
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* For the VIRTIO_NET_F_STATUS feature, we don't negotiate it, hence per spec
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* we should assume the link is always active.
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*/
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static const u32 feature[] = {
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VIRTIO_NET_F_MAC
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};
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static const u32 feature_legacy[] = {
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VIRTIO_NET_F_MAC
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};
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static int virtio_net_start(struct udevice *dev)
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{
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struct virtio_net_priv *priv = dev_get_priv(dev);
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struct virtio_sg sg;
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struct virtio_sg *sgs[] = { &sg };
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int i;
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if (!priv->rx_running) {
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/* receive buffer length is always 1526 */
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sg.length = VIRTIO_NET_RX_BUF_SIZE;
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/* setup the receive buffer address */
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for (i = 0; i < VIRTIO_NET_NUM_RX_BUFS; i++) {
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sg.addr = priv->rx_buff[i];
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virtqueue_add(priv->rx_vq, sgs, 0, 1);
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}
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virtqueue_kick(priv->rx_vq);
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/* setup the receive queue only once */
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priv->rx_running = true;
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}
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return 0;
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}
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static int virtio_net_send(struct udevice *dev, void *packet, int length)
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{
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struct virtio_net_priv *priv = dev_get_priv(dev);
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struct virtio_net_hdr hdr;
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struct virtio_sg hdr_sg = { &hdr, sizeof(hdr) };
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struct virtio_sg data_sg = { packet, length };
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struct virtio_sg *sgs[] = { &hdr_sg, &data_sg };
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int ret;
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memset(&hdr, 0, sizeof(struct virtio_net_hdr));
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ret = virtqueue_add(priv->tx_vq, sgs, 2, 0);
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if (ret)
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return ret;
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virtqueue_kick(priv->tx_vq);
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while (1) {
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if (virtqueue_get_buf(priv->tx_vq, NULL))
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break;
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}
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return 0;
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}
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static int virtio_net_recv(struct udevice *dev, int flags, uchar **packetp)
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{
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struct virtio_net_priv *priv = dev_get_priv(dev);
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unsigned int len;
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void *buf;
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buf = virtqueue_get_buf(priv->rx_vq, &len);
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if (!buf)
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return -EAGAIN;
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*packetp = buf + sizeof(struct virtio_net_hdr);
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return len - sizeof(struct virtio_net_hdr);
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}
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static int virtio_net_free_pkt(struct udevice *dev, uchar *packet, int length)
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{
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struct virtio_net_priv *priv = dev_get_priv(dev);
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void *buf = packet - sizeof(struct virtio_net_hdr);
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struct virtio_sg sg = { buf, VIRTIO_NET_RX_BUF_SIZE };
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struct virtio_sg *sgs[] = { &sg };
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/* Put the buffer back to the rx ring */
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virtqueue_add(priv->rx_vq, sgs, 0, 1);
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return 0;
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}
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static void virtio_net_stop(struct udevice *dev)
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{
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/*
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* There is no way to stop the queue from running, unless we issue
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* a reset to the virtio device, and re-do the queue initialization
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* from the beginning.
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*/
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}
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static int virtio_net_write_hwaddr(struct udevice *dev)
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{
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
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struct eth_pdata *pdata = dev_get_platdata(dev);
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int i;
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/*
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* v1.0 compliant device's MAC address is set through control channel,
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* which we don't support for now.
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*/
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if (!uc_priv->legacy)
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return -ENOSYS;
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for (i = 0; i < sizeof(pdata->enetaddr); i++) {
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virtio_cwrite8(dev,
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offsetof(struct virtio_net_config, mac) + i,
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pdata->enetaddr[i]);
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}
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return 0;
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}
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static int virtio_net_read_rom_hwaddr(struct udevice *dev)
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{
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struct eth_pdata *pdata = dev_get_platdata(dev);
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if (!pdata)
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return -ENOSYS;
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if (virtio_has_feature(dev, VIRTIO_NET_F_MAC)) {
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virtio_cread_bytes(dev,
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offsetof(struct virtio_net_config, mac),
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pdata->enetaddr, sizeof(pdata->enetaddr));
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}
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return 0;
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}
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static int virtio_net_bind(struct udevice *dev)
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{
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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
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/* Indicate what driver features we support */
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virtio_driver_features_init(uc_priv, feature, ARRAY_SIZE(feature),
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feature_legacy, ARRAY_SIZE(feature_legacy));
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return 0;
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}
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static int virtio_net_probe(struct udevice *dev)
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{
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struct virtio_net_priv *priv = dev_get_priv(dev);
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int ret;
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ret = virtio_find_vqs(dev, 2, priv->vqs);
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if (ret < 0)
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return ret;
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return 0;
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}
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static const struct eth_ops virtio_net_ops = {
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.start = virtio_net_start,
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.send = virtio_net_send,
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.recv = virtio_net_recv,
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.free_pkt = virtio_net_free_pkt,
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.stop = virtio_net_stop,
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.write_hwaddr = virtio_net_write_hwaddr,
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.read_rom_hwaddr = virtio_net_read_rom_hwaddr,
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};
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U_BOOT_DRIVER(virtio_net) = {
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.name = VIRTIO_NET_DRV_NAME,
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.id = UCLASS_ETH,
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.bind = virtio_net_bind,
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.probe = virtio_net_probe,
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.remove = virtio_reset,
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.ops = &virtio_net_ops,
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.priv_auto_alloc_size = sizeof(struct virtio_net_priv),
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.platdata_auto_alloc_size = sizeof(struct eth_pdata),
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.flags = DM_FLAG_ACTIVE_DMA,
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};
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268
drivers/virtio/virtio_net.h
Normal file
268
drivers/virtio/virtio_net.h
Normal file
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@ -0,0 +1,268 @@
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/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
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* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
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*
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* From Linux kernel include/uapi/linux/virtio_net.h
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*/
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#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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/* TODO: needs to be removed! */
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#define ETH_ALEN 6
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/* The feature bitmap for virtio net */
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/* Host handles pkts w/ partial csum */
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#define VIRTIO_NET_F_CSUM 0
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/* Guest handles pkts w/ partial csum */
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#define VIRTIO_NET_F_GUEST_CSUM 1
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/* Dynamic offload configuration */
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#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
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/* Initial MTU advice */
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#define VIRTIO_NET_F_MTU 3
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/* Host has given MAC address */
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#define VIRTIO_NET_F_MAC 5
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/* Guest can handle TSOv4 in */
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#define VIRTIO_NET_F_GUEST_TSO4 7
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/* Guest can handle TSOv6 in */
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#define VIRTIO_NET_F_GUEST_TSO6 8
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/* Guest can handle TSO[6] w/ ECN in */
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#define VIRTIO_NET_F_GUEST_ECN 9
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/* Guest can handle UFO in */
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#define VIRTIO_NET_F_GUEST_UFO 10
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/* Host can handle TSOv4 in */
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#define VIRTIO_NET_F_HOST_TSO4 11
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/* Host can handle TSOv6 in */
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#define VIRTIO_NET_F_HOST_TSO6 12
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/* Host can handle TSO[6] w/ ECN in */
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#define VIRTIO_NET_F_HOST_ECN 13
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/* Host can handle UFO in */
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#define VIRTIO_NET_F_HOST_UFO 14
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/* Host can merge receive buffers */
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#define VIRTIO_NET_F_MRG_RXBUF 15
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/* virtio_net_config.status available */
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#define VIRTIO_NET_F_STATUS 16
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/* Control channel available */
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#define VIRTIO_NET_F_CTRL_VQ 17
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/* Control channel RX mode support */
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#define VIRTIO_NET_F_CTRL_RX 18
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/* Control channel VLAN filtering */
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#define VIRTIO_NET_F_CTRL_VLAN 19
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/* Extra RX mode control support */
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#define VIRTIO_NET_F_CTRL_RX_EXTRA 20
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/* Guest can announce device on the network */
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#define VIRTIO_NET_F_GUEST_ANNOUNCE 21
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/* Device supports receive flow steering */
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#define VIRTIO_NET_F_MQ 22
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/* Set MAC address */
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#define VIRTIO_NET_F_CTRL_MAC_ADDR 23
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/* Device set linkspeed and duplex */
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#define VIRTIO_NET_F_SPEED_DUPLEX 63
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#ifndef VIRTIO_NET_NO_LEGACY
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/* Host handles pkts w/ any GSO type */
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#define VIRTIO_NET_F_GSO 6
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#endif /* VIRTIO_NET_NO_LEGACY */
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#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
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#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
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struct __packed virtio_net_config {
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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__u8 mac[ETH_ALEN];
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/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
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__u16 status;
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/*
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* Maximum number of each of transmit and receive queues;
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* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
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* Legal values are between 1 and 0x8000
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*/
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__u16 max_virtqueue_pairs;
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/* Default maximum transmit unit advice */
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__u16 mtu;
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/*
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* speed, in units of 1Mb. All values 0 to INT_MAX are legal.
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* Any other value stands for unknown.
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*/
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__u32 speed;
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/*
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* 0x00 - half duplex
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* 0x01 - full duplex
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* Any other value stands for unknown.
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*/
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__u8 duplex;
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};
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/*
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* This header comes first in the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*
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* This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
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* only flattened.
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*/
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struct virtio_net_hdr_v1 {
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 0x01 /* Use csum_start, csum_offset */
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#define VIRTIO_NET_HDR_F_DATA_VALID 0x02 /* Csum is valid */
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__u8 flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0x00 /* Not a GSO frame */
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#define VIRTIO_NET_HDR_GSO_TCPV4 0x01 /* GSO frame, IPv4 TCP (TSO) */
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#define VIRTIO_NET_HDR_GSO_UDP 0x03 /* GSO frame, IPv4 UDP (UFO) */
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#define VIRTIO_NET_HDR_GSO_TCPV6 0x04 /* GSO frame, IPv6 TCP */
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#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
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__u8 gso_type;
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__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
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__virtio16 csum_start; /* Position to start checksumming from */
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__virtio16 csum_offset; /* Offset after that to place checksum */
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__virtio16 num_buffers; /* Number of merged rx buffers */
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};
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#ifndef VIRTIO_NET_NO_LEGACY
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/*
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* This header comes first in the scatter-gather list.
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*
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* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
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* be the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header.
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*/
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struct virtio_net_hdr {
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/* See VIRTIO_NET_HDR_F_* */
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__u8 flags;
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/* See VIRTIO_NET_HDR_GSO_* */
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__u8 gso_type;
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__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
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__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
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__virtio16 csum_start; /* Position to start checksumming from */
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__virtio16 csum_offset; /* Offset after that to place checksum */
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};
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/*
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* This is the version of the header to use when the MRG_RXBUF
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* feature has been negotiated.
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*/
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struct virtio_net_hdr_mrg_rxbuf {
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struct virtio_net_hdr hdr;
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__virtio16 num_buffers; /* Number of merged rx buffers */
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};
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#endif /* ...VIRTIO_NET_NO_LEGACY */
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/*
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* Control virtqueue data structures
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*
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* The control virtqueue expects a header in the first sg entry
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* and an ack/status response in the last entry. Data for the
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* command goes in between.
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*/
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struct __packed virtio_net_ctrl_hdr {
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__u8 class;
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__u8 cmd;
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};
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typedef __u8 virtio_net_ctrl_ack;
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#define VIRTIO_NET_OK 0
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#define VIRTIO_NET_ERR 1
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/*
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* Control the RX mode, ie. promisucous, allmulti, etc...
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*
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* All commands require an "out" sg entry containing a 1 byte state value,
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* zero = disable, non-zero = enable.
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*
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* Commands 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
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* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
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*/
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#define VIRTIO_NET_CTRL_RX 0
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#define VIRTIO_NET_CTRL_RX_PROMISC 0
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#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
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#define VIRTIO_NET_CTRL_RX_ALLUNI 2
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#define VIRTIO_NET_CTRL_RX_NOMULTI 3
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#define VIRTIO_NET_CTRL_RX_NOUNI 4
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#define VIRTIO_NET_CTRL_RX_NOBCAST 5
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/*
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* Control the MAC
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*
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* The MAC filter table is managed by the hypervisor, the guest should assume
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* the size is infinite. Filtering should be considered non-perfect, ie. based
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* on hypervisor resources, the guest may received packets from sources not
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* specified in the filter list.
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*
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* In addition to the class/cmd header, the TABLE_SET command requires two
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* out scatterlists. Each contains a 4 byte count of entries followed by a
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* concatenated byte stream of the ETH_ALEN MAC addresses. The first sg list
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* contains unicast addresses, the second is for multicast. This functionality
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* is present if the VIRTIO_NET_F_CTRL_RX feature is available.
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*
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* The ADDR_SET command requests one out scatterlist, it contains a 6 bytes MAC
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||||
* 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 */
|
||||
Loading…
Reference in a new issue