[ofa-general] Re: [PATCH 1/4] ib/ipoib: specify TClass and FlowLabel with PR queries for QoS support

[Michael S. Tsirkin]

> Quoting Roland Dreier <rdreier at cisco.com>:
> Subject: Re: [PATCH 1/4] ib/ipoib: specify TClass and FlowLabel with PR queries for QoS support
> 
>  > Roland, I realized now that the current IPoIB implementation does not
>  > set IB_SA_PATH_REC_MTU and IB_SA_PATH_REC_RATE (and their selectors)
>  > in the SA path query where it does so for SA multicast joins. Is there
>  > a specific reason for that? do you assume that if the remote node has
>  > managed to join the broadcast group as this node this the SA enforced
>  > some sort of MTU and RATE compliance which you would get in the
>  > returned path record?
> 
> Yes, I guess there is a corner case where the SA might return a path
> where the MTU is too small.  I don't think we need to specify the rate
> because things should work fine no matter what rate we get.

OFED includes a patch where MTU is taken from the device MTU.
Want to see it?

An alternative would be to use bcast group MTU.



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MST