This is the follow on patch to the kernel series which changes the default Node Description to be "<hostname> <device>" This patch adds support for a "RDMA Node Description Daemon" (rdma-ndd) which uses the new poll support of the procfs hostname file to monitor for changes to the hostname and updates the Node Descriptions appropriately. Both the kernel changes and the user space daemon are necessary to ensure that the Node Description in the SMA and SA reflect the hostname/device in all cases if the device supports traps and the SM either responds to those traps or polls for the Node Description periodically. This is true for the following reasons. 1) No matter when the drivers are loaded they will return "<hostname> <device>" to the SM when initially queried. 2) If the hostname is not set when the driver is loaded (as is likely at boot) subsequent sets of hostname (from any source including dhclient) will trigger the daemon to update all node descriptions. The use of dhclient hooks is not sufficient to handle user invoked hostname changes. 3) If the daemon is started after the hostname has changed it starts by writing the hostname to the Node Descriptions sysfs files which will trigger the devices to send a trap to the SM. Thus the drivers, any automated set of the hostname (such as DHCP), and the rdma-ndd daemon can be started in any order and the SMA will reflect the hostname properly. [PATCH] infiniband-diags: add rdma-ndd daemon -- 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
