On Fri, 29 May 2020 16:59:28 +0200 Andrew Lunn <and...@lunn.ch> wrote:
> On Fri, May 29, 2020 at 01:05:39PM +0200, Thomas Bogendoerfer wrote: > > On Thu, 28 May 2020 23:04:20 +0100 > > Russell King - ARM Linux admin <li...@armlinux.org.uk> wrote: > > > > > Can you explain this please? Just as we think we understand what's > > > going on here, you throw in a new comment that makes us confused. > > > > sorry about that. > > > > > You said previously that the mvpp2 was connected to a switch, which > > > makes us think that you've got some DSA-like setup going on here. > > > Does your switch drop its serdes link when all the external links > > > (presumably the 10G SFP+ cages) fail? > > > > > > Both Andrew and myself wish to have a complete picture before we > > > move forward with this. > > > > full understandable, I'll try by a small picture, which just > > covers one switch: > > > > external ports > > | | | | > > *-----------------------------* > > | 1 1 2 2 | > > | | > > | switch | > > | | > > | 1 2 1 2 | > > *-----------------------------* > > | | | | > > | | | | > > *----------* *----------* > > | 1 2 | | 1 2 | > > | | | | > > | node 1 | ... | node 8 | > > | | | | > > *----------* *----------* > > > > External ports a grouped in ports to network 1 and network 2. If one of the > > external ports has an established link, this link state will be propagated > > to the internal ports. Same when both external ports of a network are down. > > By propagated, you mean if the external link is down, the link between > the switch and node 1 will also be forced down, at the SERDES level? yes > And if external ports are down, the nodes cannot talk to each other? correct > External link down causes the whole in box network to fall apart? That > seems a rather odd design. as I'm not an expert in ceph, I can't judge. But I'll bring it up. > > I have no control over the software running on the switch, therefore I can't > > enable autoneg on the internal links. > > O.K. So that means using in-band signalling in DT is clearly > wrong. There is no signalling.... > > What you are actually interested in is the sync state of the SERDES? > The link is up if the SERDES has sync. yes, that's what I need. How can I do that ? Thomas. -- SUSE Software Solutions Germany GmbH HRB 36809 (AG Nürnberg) Geschäftsführer: Felix Imendörffer
