On Wed, Apr 15, 2015 at 01:29:31PM -0600, Hefty, Sean wrote: > > libibverbs also exposes transport at the device level. Isn't a change to > > make transport per port rather than per device needed there as well to > > be consistent with these proposed kernel changes ? If so, would the > > additional IBoE transport be exposed ? We also need to worry about > > backward compatibility for existing applications. > > Libibverbs probably can't change without bumping the major version number. If the kernel attribute structures change, this is probably something that the user_verbs module would need to handle to avoid breaking the ABI. > Transport is not directly sent thought the kernel ABI. It is fabricated when the HCA provider driver is loaded. static struct ibv_device *try_driver(struct ibv_driver *driver, struct ibv_sysfs_dev *sysfs_dev) { ... switch (dev->node_type) { case IBV_NODE_CA: case IBV_NODE_SWITCH: case IBV_NODE_ROUTER: dev->transport_type = IBV_TRANSPORT_IB; break; case IBV_NODE_RNIC: dev->transport_type = IBV_TRANSPORT_IWARP; break; case IBV_NODE_USNIC: dev->transport_type = IBV_TRANSPORT_USNIC; break; case IBV_NODE_USNIC_UDP: dev->transport_type = IBV_TRANSPORT_USNIC_UDP; break; default: dev->transport_type = IBV_TRANSPORT_UNKNOWN; break; } ... } I'm not sure how to fix this once we get to the user space problem. But I don't think it affects this set of patches. Ira -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html