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virtio: net: Support non-legacy device

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For v1.0 compliant device, it always assumes the member 'num_buffers'
exists in the struct virtio_net_hdr while the legacy driver only
presented 'num_buffers' when VIRTIO_NET_F_MRG_RXBUF was negotiated.
Without that feature the structure was 2 bytes shorter.

Update the driver to support the non-legacy device.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2018-10-15 02:21:24 -07:00 • committed by Simon Glass
parent 550435edf8
commit 699aae0800
1 changed files with 26 additions and 5 deletions
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31
drivers/virtio/virtio_net.c
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@ -32,6 +32,7 @@ struct virtio_net_priv {
char rx_buff[VIRTIO_NET_NUM_RX_BUFS][VIRTIO_NET_RX_BUF_SIZE];
bool rx_running;
int net_hdr_len;
};
/*
@ -77,12 +78,19 @@ 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_net_hdr_v1 hdr_v1;
struct virtio_sg hdr_sg;
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));
if (priv->net_hdr_len == sizeof(struct virtio_net_hdr))
hdr_sg.addr = &hdr;
else
hdr_sg.addr = &hdr_v1;
hdr_sg.length = priv->net_hdr_len;
memset(hdr_sg.addr, 0, priv->net_hdr_len);
ret = virtqueue_add(priv->tx_vq, sgs, 2, 0);
if (ret)
@ -108,14 +116,14 @@ static int virtio_net_recv(struct udevice *dev, int flags, uchar **packetp)
if (!buf)
return -EAGAIN;
*packetp = buf + sizeof(struct virtio_net_hdr);
return len - sizeof(struct virtio_net_hdr);
*packetp = buf + priv->net_hdr_len;
return len - priv->net_hdr_len;
}
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);
void *buf = packet - priv->net_hdr_len;
struct virtio_sg sg = { buf, VIRTIO_NET_RX_BUF_SIZE };
struct virtio_sg *sgs[] = { &sg };
@ -186,12 +194,25 @@ static int virtio_net_bind(struct udevice *dev)
static int virtio_net_probe(struct udevice *dev)
{
struct virtio_net_priv *priv = dev_get_priv(dev);
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(dev->parent);
int ret;
ret = virtio_find_vqs(dev, 2, priv->vqs);
if (ret < 0)
return ret;
/*
* For v1.0 compliant device, it always assumes the member
* 'num_buffers' exists in the struct virtio_net_hdr while
* the legacy driver only presented 'num_buffers' when
* VIRTIO_NET_F_MRG_RXBUF was negotiated. Without that feature
* the structure was 2 bytes shorter.
*/
if (uc_priv->legacy)
priv->net_hdr_len = sizeof(struct virtio_net_hdr);
else
priv->net_hdr_len = sizeof(struct virtio_net_hdr_v1);
return 0;
}