The following series defines a new mad core function to support Node Description processing which supports format specifiers. The first 2 format specifiers are "%h" and "%d" for hostname and device respectively. It also changes the default Node Description of all the devices which support Node Description in software to use "%h %d" by default which translates into <hostname> <device>. Note that the sysfs node_desc file for devices now reflects the format specifier and not the actual remapped Node Description. This allows userspace to detect the current format used and change it as needed. Devices which store the Node Description in FW have a translated version written to FW while maintaining the format specifier string in memory. This work is a continuation of the following thread and the work done by Mike Heinz: http://www.mail-archive.com/linux-rdma@xxxxxxxxxxxxxxx/msg07329.html A follow on patch to the infiniband-diags package 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 1/6] ib/mad: Add function to support format specifiers for node description [PATCH 2/6] ib/ipath: change default node description processing [PATCH 3/6] ib/mlx4: change default node description processing [PATCH 4/6] ib/mthca: change default node description processing [PATCH 5/6] ib/qib: change default node description processing [PATCH 6/6] ib/mlx5: change default node description processing -- 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
