> Are there any examples out there of IB applications that use
> RDMA_OPTION_ID_TOS? I'm looking to make this available for iwarp
> transports, but I'm still trying to understand how its currently used,
> and what values are used. Since this option is level RDMA_OPTION_ID, I
> guess it is transport-neutral?
It's transport neutral, but only defined to do anything in the kernel with IB.
For IB, it ends up being used as input into the path record query (as
qos_class). The SA uses the value as input for the resulting path record, most
likely to set the SL value.
For iWarp I would expect it to behave similar to RFC 2474, which I haven't look
at in a while. Note the RoCE ends up using the TOS value to set the path
record SL using this code:
route->path_rec->sl = netdev_get_prio_tc_map(
ndev->priv_flags & IFF_802_1Q_VLAN ?
vlan_dev_real_dev(ndev) : ndev,
rt_tos2priority(id_priv->tos));
I don't know if this helps with iWarp, but it may be worth looking at those
calls in more detail.
- Sean
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