mirror of
https://github.com/AsahiLinux/u-boot
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c69cda25c9
Rename this to be consistent with the change from 'platdata'. Signed-off-by: Simon Glass <sjg@chromium.org>
239 lines
5.6 KiB
C
239 lines
5.6 KiB
C
// 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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int net_hdr_len;
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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_net_hdr_v1 hdr_v1;
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struct virtio_sg hdr_sg;
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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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if (priv->net_hdr_len == sizeof(struct virtio_net_hdr))
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hdr_sg.addr = &hdr;
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else
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hdr_sg.addr = &hdr_v1;
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hdr_sg.length = priv->net_hdr_len;
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memset(hdr_sg.addr, 0, priv->net_hdr_len);
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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 + priv->net_hdr_len;
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return len - priv->net_hdr_len;
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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 - priv->net_hdr_len;
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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_plat(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_plat(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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struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
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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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/*
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* For v1.0 compliant device, it always assumes the member
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* 'num_buffers' exists in the struct virtio_net_hdr while
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* the legacy driver only presented 'num_buffers' when
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* VIRTIO_NET_F_MRG_RXBUF was negotiated. Without that feature
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* the structure was 2 bytes shorter.
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*/
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if (uc_priv->legacy)
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priv->net_hdr_len = sizeof(struct virtio_net_hdr);
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else
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priv->net_hdr_len = sizeof(struct virtio_net_hdr_v1);
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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 = sizeof(struct virtio_net_priv),
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.plat_auto = sizeof(struct eth_pdata),
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.flags = DM_FLAG_ACTIVE_DMA,
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};
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