svcrdma: Add a type for keeping NFS RPC mapping
Create a new data structure to hold the remote client address space
to local server address space mapping.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
index 88c0ca2..171f205 100644
--- a/net/sunrpc/xprtrdma/svc_rdma.c
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -69,6 +69,9 @@
atomic_t rdma_stat_sq_poll;
atomic_t rdma_stat_sq_prod;
+/* Temporary NFS request map cache */
+struct kmem_cache *svc_rdma_map_cachep;
+
/*
* This function implements reading and resetting an atomic_t stat
* variable through read/write to a proc file. Any write to the file
@@ -241,6 +244,7 @@
svcrdma_table_header = NULL;
}
svc_unreg_xprt_class(&svc_rdma_class);
+ kmem_cache_destroy(svc_rdma_map_cachep);
}
int svc_rdma_init(void)
@@ -255,9 +259,24 @@
svcrdma_table_header =
register_sysctl_table(svcrdma_root_table);
+ /* Create the temporary map cache */
+ svc_rdma_map_cachep = kmem_cache_create("svc_rdma_map_cache",
+ sizeof(struct svc_rdma_req_map),
+ 0,
+ SLAB_HWCACHE_ALIGN,
+ NULL);
+ if (!svc_rdma_map_cachep) {
+ printk(KERN_INFO "Could not allocate map cache.\n");
+ goto err;
+ }
+
/* Register RDMA with the SVC transport switch */
svc_reg_xprt_class(&svc_rdma_class);
return 0;
+
+ err:
+ unregister_sysctl_table(svcrdma_table_header);
+ return -ENOMEM;
}
MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
MODULE_DESCRIPTION("SVC RDMA Transport");
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index e132509..ae90758 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -173,6 +173,32 @@
atomic_dec(&xprt->sc_ctxt_used);
}
+/* Temporary NFS request map cache. Created in svc_rdma.c */
+extern struct kmem_cache *svc_rdma_map_cachep;
+
+/*
+ * Temporary NFS req mappings are shared across all transport
+ * instances. These are short lived and should be bounded by the number
+ * of concurrent server threads * depth of the SQ.
+ */
+struct svc_rdma_req_map *svc_rdma_get_req_map(void)
+{
+ struct svc_rdma_req_map *map;
+ while (1) {
+ map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL);
+ if (map)
+ break;
+ schedule_timeout_uninterruptible(msecs_to_jiffies(500));
+ }
+ map->count = 0;
+ return map;
+}
+
+void svc_rdma_put_req_map(struct svc_rdma_req_map *map)
+{
+ kmem_cache_free(svc_rdma_map_cachep, map);
+}
+
/* ib_cq event handler */
static void cq_event_handler(struct ib_event *event, void *context)
{