On Wed, Jun 24, 2020 at 06:14:52PM +0300, Jenny Adams wrote:
> Under the eth0 the driver is given as lan78xx.
That driver does in fact implement SW Tx time stamping.
static netdev_tx_t
lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net)
{
struct lan78xx_net *dev = netdev_priv(net);
struct sk_buff *skb2 = NULL;
if (skb) {
skb_tx_timestamp(skb);
skb2 = lan78xx_tx_prep(dev, skb, GFP_ATOMIC);
}
...
}
BUT it does not advertise the correct tsinfo via ethtool.
You can either:
1. Hack the driver to advertise the correct info.
This is the proper way. You can submit a patch to the Linux netdev
list with your fix.
2. hack linuxptp/clock.c to ignore false info.
This is the hacky way. Don't submit a patch to linuxptp if you
choose this way, as it will be rejected.
Thanks,
Richard
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