On Fri, Nov 09, 2018 at 01:08:21PM +0000, Parav Pandit wrote:
> 1. RoCE default GIDs are constructed out of mac address and not from
> the port GUID. (spec violation section 3.5.10)
> 2. two default GIDs are constructed v1 and v2 for those HCAs which
> support it. Nothing wrong there, but as side effect, RoCE Annex
> standard A16.5.1 cannot be followed ("resolving destination by
> standard ARP or ND").
> 3. In order to adhere to A 16.5.1 (that is - to always call
> rdma_addr_find_l2_eth_by_grh(), regardless of GID type), GIDs has to
> be based on IP addresses. This contradicts with the base IB spec to
> have GID based out of port_GUID. Doing so will also make IB stack
> rely on IPv6 functionality, which is not a problem, but then default
> GID has to be constructed out of IP address and not mac address. I
> have seen Ubuntu platform where link local IPv6 address by default
> is not a function of MAC address.
I always thought this ment that the IP address should be resolved to a
MAC using ND, and then the MAC should be constructed into a GID and
used for RoCEv1 addressing.
Not that RoCEv1 GID's should contain IP addresses - v1 does not
support IP addressing on the wire
Jason
