From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Heinz Subject: [PATCH v2 0/2] Improved Node Descriptions Date: Wed, 23 Feb 2011 21:24:38 -0500 Message-ID: <20110224022124.26808.62012.stgit@homer> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, michael.heinz-h88ZbnxC6KDQT0dZR+AlfA@public.gmane.org Cc: todd.rimmer-h88ZbnxC6KDQT0dZR+AlfA@public.gmane.org List-Id: linux-rdma@vger.kernel.org The common practice in IB fabrics is to set the description of an HCA to be the hostname of the machine plus a description (i.e., "myhost hca-1", "myhost hca-2", etc..) This has a limitation, however. The first is that if the machine's hostname is set via DHCP, the HCA description may be set before the hostname is, leading to an incorrect description. This can also occur if the machine's hostname changes for some other reason after boot. This can cause difficulties and confusion when trying to maintain a large fabric - if all your nodes are described as "localhost HCA-1" it can be very difficult to figure out which node is suffering from symbol errors. This patch addresses the problem by providing a function to build the node description. If the provided source string for the description contains a '%h' it will be replaced at read time with the hostname of the node. If the provided source string contains a '%d' it will be replaced at read time with the name of the HCA. For example, the first Mellanox HCA on a node called "homer" would have the default description: homer: mthca0 MT25208 InfiniHostEx Mellanox Technologies While the default description for the second QLogic HCA on node-a13 would be: node-a2: qib0 QLogic kernel.org driver This ensures that even after a fabric has been completely initialized, if a node's hostname changes, that change will be reflected in the next sweep of the SM, but also maintains compatibility with existing code since the behavior is unchanged if the description string does not contain a '%' character. Changes from Version 1: Replaced the original substitution of the hostname for '@' with an implementation of the '%h' and '%d' fields, and changed the default node description for Mellanox and QLogic HCA types to default to "%h: %d " where '' is the old default message. --- Michael Heinz (2): Function for improved node descriptions Add support for ib_build_node_desc() to the HCAs. drivers/infiniband/core/mad.c | 33 ++++++++++++++++++++++++++ drivers/infiniband/hw/ipath/ipath_mad.c | 2 +- drivers/infiniband/hw/ipath/ipath_verbs.c | 4 ++- drivers/infiniband/hw/mlx4/mad.c | 2 +- drivers/infiniband/hw/mlx4/main.c | 3 ++ drivers/infiniband/hw/mthca/mthca_mad.c | 2 +- drivers/infiniband/hw/mthca/mthca_provider.c | 3 ++ drivers/infiniband/hw/qib/qib_mad.c | 2 +- drivers/infiniband/hw/qib/qib_verbs.c | 2 +- include/rdma/ib_mad.h | 9 +++++++ 10 files changed, 53 insertions(+), 9 deletions(-) -- Signed-off-by: Michael Heinz -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html