On Tue, May 16, 2017 at 03:09:17PM +0200, Rafa Corvillo wrote:
> >>Adding 8 bytes (sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN + 8
> >>(EDSA_HLEN)) does not fix the error, because the interface keep
> >>having a maximum length of 1518 bytes (sky2->netdev->mtu + ETH_HLEN
> >>+ VLAN_HLEN).
> >
> >Did you check the value being written to here:
> >
> > /*
> > * The receiver hangs if it receives frames larger than the
> > * packet buffer. As a workaround, truncate oversize frames, but
> > * the register is limited to 9 bits, so if you do frames > 2052
> > * you better get the MTU right!
> > */
> > thresh = sky2_get_rx_threshold(sky2);
> > if (thresh > 0x1ff)
> > sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T),
> > RX_TRUNC_OFF);
> > else {
> > sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh);
> > sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T),
> > RX_TRUNC_ON);
> > }
> >
> >
> >What is thresh?
>
> The value of thresh is 380.
So that is 1528.
You could hack it and try 0x1ff.
Also, check that in sky2_rx_add(), le->length is set to 4K.
Andrew
