RDS: Add userspace header

Applications include this header in order to use RDS sockets.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/rds.h

+/*
+ * Copyright (c) 2008 Oracle.  All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef _LINUX_RDS_H
+#define _LINUX_RDS_H
+
+#include <linux/types.h>
+
+/* These sparse annotated types shouldn't be in any user
+ * visible header file. We should clean this up rather
+ * than kludging around them. */
+#ifndef __KERNEL__
+#define __be16	u_int16_t
+#define __be32	u_int32_t
+#define __be64	u_int64_t
+#endif
+
+#define RDS_IB_ABI_VERSION		0x301
+
+/*
+ * setsockopt/getsockopt for SOL_RDS
+ */
+#define RDS_CANCEL_SENT_TO      	1
+#define RDS_GET_MR			2
+#define RDS_FREE_MR			3
+/* deprecated: RDS_BARRIER 4 */
+#define RDS_RECVERR			5
+#define RDS_CONG_MONITOR		6
+
+/*
+ * Control message types for SOL_RDS.
+ *
+ * CMSG_RDMA_ARGS (sendmsg)
+ *	Request a RDMA transfer to/from the specified
+ *	memory ranges.
+ *	The cmsg_data is a struct rds_rdma_args.
+ * RDS_CMSG_RDMA_DEST (recvmsg, sendmsg)
+ *	Kernel informs application about intended
+ *	source/destination of a RDMA transfer
+ * RDS_CMSG_RDMA_MAP (sendmsg)
+ *	Application asks kernel to map the given
+ *	memory range into a IB MR, and send the
+ *	R_Key along in an RDS extension header.
+ *	The cmsg_data is a struct rds_get_mr_args,
+ *	the same as for the GET_MR setsockopt.
+ * RDS_CMSG_RDMA_STATUS (recvmsg)
+ *	Returns the status of a completed RDMA operation.
+ */
+#define RDS_CMSG_RDMA_ARGS		1
+#define RDS_CMSG_RDMA_DEST		2
+#define RDS_CMSG_RDMA_MAP		3
+#define RDS_CMSG_RDMA_STATUS		4
+#define RDS_CMSG_CONG_UPDATE		5
+
+#define RDS_INFO_FIRST			10000
+#define RDS_INFO_COUNTERS		10000
+#define RDS_INFO_CONNECTIONS		10001
+/* 10002 aka RDS_INFO_FLOWS is deprecated */
+#define RDS_INFO_SEND_MESSAGES		10003
+#define RDS_INFO_RETRANS_MESSAGES       10004
+#define RDS_INFO_RECV_MESSAGES          10005
+#define RDS_INFO_SOCKETS                10006
+#define RDS_INFO_TCP_SOCKETS            10007
+#define RDS_INFO_IB_CONNECTIONS		10008
+#define RDS_INFO_CONNECTION_STATS	10009
+#define RDS_INFO_IWARP_CONNECTIONS	10010
+#define RDS_INFO_LAST			10010
+
+struct rds_info_counter {
+	u_int8_t	name[32];
+	u_int64_t	value;
+} __attribute__((packed));
+
+#define RDS_INFO_CONNECTION_FLAG_SENDING	0x01
+#define RDS_INFO_CONNECTION_FLAG_CONNECTING	0x02
+#define RDS_INFO_CONNECTION_FLAG_CONNECTED	0x04
+
+#define TRANSNAMSIZ	16
+
+struct rds_info_connection {
+	u_int64_t	next_tx_seq;
+	u_int64_t	next_rx_seq;
+	__be32		laddr;
+	__be32		faddr;
+	u_int8_t	transport[TRANSNAMSIZ];		/* null term ascii */
+	u_int8_t	flags;
+} __attribute__((packed));
+
+struct rds_info_flow {
+	__be32		laddr;
+	__be32		faddr;
+	u_int32_t	bytes;
+	__be16		lport;
+	__be16		fport;
+} __attribute__((packed));
+
+#define RDS_INFO_MESSAGE_FLAG_ACK               0x01
+#define RDS_INFO_MESSAGE_FLAG_FAST_ACK          0x02
+
+struct rds_info_message {
+	u_int64_t	seq;
+	u_int32_t	len;
+	__be32		laddr;
+	__be32		faddr;
+	__be16		lport;
+	__be16		fport;
+	u_int8_t	flags;
+} __attribute__((packed));
+
+struct rds_info_socket {
+	u_int32_t	sndbuf;
+	__be32		bound_addr;
+	__be32		connected_addr;
+	__be16		bound_port;
+	__be16		connected_port;
+	u_int32_t	rcvbuf;
+	u_int64_t	inum;
+} __attribute__((packed));
+
+#define RDS_IB_GID_LEN	16
+struct rds_info_rdma_connection {
+	__be32		src_addr;
+	__be32		dst_addr;
+	uint8_t		src_gid[RDS_IB_GID_LEN];
+	uint8_t		dst_gid[RDS_IB_GID_LEN];
+
+	uint32_t	max_send_wr;
+	uint32_t	max_recv_wr;
+	uint32_t	max_send_sge;
+	uint32_t	rdma_mr_max;
+	uint32_t	rdma_mr_size;
+};
+
+/*
+ * Congestion monitoring.
+ * Congestion control in RDS happens at the host connection
+ * level by exchanging a bitmap marking congested ports.
+ * By default, a process sleeping in poll() is always woken
+ * up when the congestion map is updated.
+ * With explicit monitoring, an application can have more
+ * fine-grained control.
+ * The application installs a 64bit mask value in the socket,
+ * where each bit corresponds to a group of ports.
+ * When a congestion update arrives, RDS checks the set of
+ * ports that are now uncongested against the list bit mask
+ * installed in the socket, and if they overlap, we queue a
+ * cong_notification on the socket.
+ *
+ * To install the congestion monitor bitmask, use RDS_CONG_MONITOR
+ * with the 64bit mask.
+ * Congestion updates are received via RDS_CMSG_CONG_UPDATE
+ * control messages.
+ *
+ * The correspondence between bits and ports is
+ *	1 << (portnum % 64)
+ */
+#define RDS_CONG_MONITOR_SIZE	64
+#define RDS_CONG_MONITOR_BIT(port)  (((unsigned int) port) % RDS_CONG_MONITOR_SIZE)
+#define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port))
+
+/*
+ * RDMA related types
+ */
+
+/*
+ * This encapsulates a remote memory location.
+ * In the current implementation, it contains the R_Key
+ * of the remote memory region, and the offset into it
+ * (so that the application does not have to worry about
+ * alignment).
+ */
+typedef u_int64_t	rds_rdma_cookie_t;
+
+struct rds_iovec {
+	u_int64_t	addr;
+	u_int64_t	bytes;
+};
+
+struct rds_get_mr_args {
+	struct rds_iovec vec;
+	u_int64_t	cookie_addr;
+	uint64_t	flags;
+};
+
+struct rds_free_mr_args {
+	rds_rdma_cookie_t cookie;
+	u_int64_t	flags;
+};
+
+struct rds_rdma_args {
+	rds_rdma_cookie_t cookie;
+	struct rds_iovec remote_vec;
+	u_int64_t	local_vec_addr;
+	u_int64_t	nr_local;
+	u_int64_t	flags;
+	u_int64_t	user_token;
+};
+
+struct rds_rdma_notify {
+	u_int64_t	user_token;
+	int32_t		status;
+};
+
+#define RDS_RDMA_SUCCESS	0
+#define RDS_RDMA_REMOTE_ERROR	1
+#define RDS_RDMA_CANCELED	2
+#define RDS_RDMA_DROPPED	3
+#define RDS_RDMA_OTHER_ERROR	4
+
+/*
+ * Common set of flags for all RDMA related structs
+ */
+#define RDS_RDMA_READWRITE	0x0001
+#define RDS_RDMA_FENCE		0x0002	/* use FENCE for immediate send */
+#define RDS_RDMA_INVALIDATE	0x0004	/* invalidate R_Key after freeing MR */
+#define RDS_RDMA_USE_ONCE	0x0008	/* free MR after use */
+#define RDS_RDMA_DONTWAIT	0x0010	/* Don't wait in SET_BARRIER */
+#define RDS_RDMA_NOTIFY_ME	0x0020	/* Notify when operation completes */
+
+#endif /* IB_RDS_H */