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authorHefty, Sean <sean.hefty@intel.com>2011-05-10 07:06:10 +0200
committerRoland Dreier <roland@purestorage.com>2011-05-10 07:06:10 +0200
commita9bb79128aa659f97b774b97c9bb1bdc74444595 (patch)
tree20208e66195581568e5c68f838897199d224fa90 /include/rdma/rdma_cm.h
parentRDMA/cma: Fix handling of IPv6 addressing in cma_use_port (diff)
downloadlinux-a9bb79128aa659f97b774b97c9bb1bdc74444595.tar.xz
linux-a9bb79128aa659f97b774b97c9bb1bdc74444595.zip
RDMA/cma: Add an ID_REUSEADDR option
Lustre requires that clients bind to a privileged port number before connecting to a remote server. On larger clusters (typically more than about 1000 nodes), the number of privileged ports is exhausted, resulting in lustre being unusable. To handle this, we add support for reusable addresses to the rdma_cm. This mimics the behavior of the socket option SO_REUSEADDR. A user may set an rdma_cm_id to reuse an address before calling rdma_bind_addr() (explicitly or implicitly). If set, other rdma_cm_id's may be bound to the same address, provided that they all have reuse enabled, and there are no active listens. If rdma_listen() is called on an rdma_cm_id that has reuse enabled, it will only succeed if there are no other id's bound to that same address. The reuse option is exported to user space. The behavior of the kernel reuse implementation was verified against that given by sockets. This patch is derived from a path by Ira Weiny <weiny2@llnl.gov> Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'include/rdma/rdma_cm.h')
-rw-r--r--include/rdma/rdma_cm.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h
index 4fae90304648..169f7a53fb0c 100644
--- a/include/rdma/rdma_cm.h
+++ b/include/rdma/rdma_cm.h
@@ -329,4 +329,14 @@ void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr);
*/
void rdma_set_service_type(struct rdma_cm_id *id, int tos);
+/**
+ * rdma_set_reuseaddr - Allow the reuse of local addresses when binding
+ * the rdma_cm_id.
+ * @id: Communication identifier to configure.
+ * @reuse: Value indicating if the bound address is reusable.
+ *
+ * Reuse must be set before an address is bound to the id.
+ */
+int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse);
+
#endif /* RDMA_CM_H */