Merge tag 'nfs-rdma-for-3.20' of git://git.linux-nfs.org/projects/anna/nfs-rdma

NFS: Client side changes for RDMA

These patches improve the scalability of the NFSoRDMA client and take large
variables off of the stack.  Additionally, the GFP_* flags are updated to
match what TCP uses.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

* tag 'nfs-rdma-for-3.20' of git://git.linux-nfs.org/projects/anna/nfs-rdma: (21 commits)
  xprtrdma: Update the GFP flags used in xprt_rdma_allocate()
  xprtrdma: Clean up after adding regbuf management
  xprtrdma: Allocate zero pad separately from rpcrdma_buffer
  xprtrdma: Allocate RPC/RDMA receive buffer separately from struct rpcrdma_rep
  xprtrdma: Allocate RPC/RDMA send buffer separately from struct rpcrdma_req
  xprtrdma: Allocate RPC send buffer separately from struct rpcrdma_req
  xprtrdma: Add struct rpcrdma_regbuf and helpers
  xprtrdma: Refactor rpcrdma_buffer_create() and rpcrdma_buffer_destroy()
  xprtrdma: Simplify synopsis of rpcrdma_buffer_create()
  xprtrdma: Take struct ib_qp_attr and ib_qp_init_attr off the stack
  xprtrdma: Take struct ib_device_attr off the stack
  xprtrdma: Free the pd if ib_query_qp() fails
  xprtrdma: Remove rpcrdma_ep::rep_func and ::rep_xprt
  xprtrdma: Move credit update to RPC reply handler
  xprtrdma: Remove rl_mr field, and the mr_chunk union
  xprtrdma: Remove rpcrdma_ep::rep_ia
  xprtrdma: Rename "xprt" and "rdma_connect" fields in struct rpcrdma_xprt
  xprtrdma: Clean up hdrlen
  xprtrdma: Display XIDs in host byte order
  xprtrdma: Modernize htonl and ntohl
  ...

2 files changed, 13 insertions, 3 deletions

diff --git a/include/linux/sunrpc/rpc_rdma.h b/include/linux/sunrpc/rpc_rdma.h
index b78f16b1dea3..f33c5a4d6fe4 100644
--- a/include/linux/sunrpc/rpc_rdma.h
+++ b/include/linux/sunrpc/rpc_rdma.h
@@ -42,6 +42,9 @@
 
 #include <linux/types.h>
 
+#define RPCRDMA_VERSION         1
+#define rpcrdma_version         cpu_to_be32(RPCRDMA_VERSION)
+
 struct rpcrdma_segment {
         __be32 rs_handle;       /* Registered memory handle */
         __be32 rs_length;       /* Length of the chunk in bytes */
@@ -95,7 +98,10 @@ struct rpcrdma_msg {
         } rm_body;
 };
 
-#define RPCRDMA_HDRLEN_MIN      28
+/*
+ * Smallest RPC/RDMA header: rm_xid through rm_type, then rm_nochunks
+ */
+#define RPCRDMA_HDRLEN_MIN      (sizeof(__be32) * 7)
 
 enum rpcrdma_errcode {
         ERR_VERS = 1,
@@ -115,4 +121,10 @@ enum rpcrdma_proc {
         RDMA_ERROR = 4          /* An RPC RDMA encoding error */
 };
 
+#define rdma_msg        cpu_to_be32(RDMA_MSG)
+#define rdma_nomsg      cpu_to_be32(RDMA_NOMSG)
+#define rdma_msgp       cpu_to_be32(RDMA_MSGP)
+#define rdma_done       cpu_to_be32(RDMA_DONE)
+#define rdma_error      cpu_to_be32(RDMA_ERROR)
+
 #endif                          /* _LINUX_SUNRPC_RPC_RDMA_H */
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 975da754c778..ddfe88f52219 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -63,8 +63,6 @@ extern atomic_t rdma_stat_rq_prod;
 extern atomic_t rdma_stat_sq_poll;
 extern atomic_t rdma_stat_sq_prod;
 
-#define RPCRDMA_VERSION 1
-
 /*
  * Contexts are built when an RDMA request is created and are a
  * record of the resources that can be recovered when the request