smb: smbdirect: add smbdirect_socket.{send,recv}_io.mem.{cache,pool}

This will be the common location memory caches and pools.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/common/smbdirect/smbdirect_socket.h

@@ -39,6 +39,20 @@ struct smbdirect_socket {
 
 	struct smbdirect_socket_parameters parameters;
 
+	/*
+	 * The state for posted send buffers
+	 */
+	struct {
+		/*
+		 * Memory pools for preallocating
+		 * smbdirect_send_io buffers
+		 */
+		struct {
+			struct kmem_cache	*cache;
+			mempool_t		*pool;
+		} mem;
+	} send_io;
+
 	/*
 	 * The state for posted receive buffers
 	 */
@@ -52,6 +66,15 @@ struct smbdirect_socket {
 			SMBDIRECT_EXPECT_DATA_TRANSFER = 3,
 		} expected;
 
+		/*
+		 * Memory pools for preallocating
+		 * smbdirect_recv_io buffers
+		 */
+		struct {
+			struct kmem_cache	*cache;
+			mempool_t		*pool;
+		} mem;
+
 		/*
 		 * The list of free smbdirect_recv_io
 		 * structures