v4.19.13 snapshot.
diff --git a/include/uapi/linux/rds.h b/include/uapi/linux/rds.h
new file mode 100644
index 0000000..8b73cb6
--- /dev/null
+++ b/include/uapi/linux/rds.h
@@ -0,0 +1,404 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR Linux-OpenIB) */
+/*
+ * Copyright (c) 2008, 2018 Oracle and/or its affiliates. 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>
+#include <linux/socket.h> /* For __kernel_sockaddr_storage. */
+#include <linux/in6.h> /* For struct in6_addr. */
+
+#define RDS_IB_ABI_VERSION 0x301
+
+#define SOL_RDS 276
+
+/*
+ * 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
+#define RDS_GET_MR_FOR_DEST 7
+#define SO_RDS_TRANSPORT 8
+
+/* Socket option to tap receive path latency
+ * SO_RDS: SO_RDS_MSG_RXPATH_LATENCY
+ * Format used struct rds_rx_trace_so
+ */
+#define SO_RDS_MSG_RXPATH_LATENCY 10
+
+
+/* supported values for SO_RDS_TRANSPORT */
+#define RDS_TRANS_IB 0
+#define RDS_TRANS_IWARP 1
+#define RDS_TRANS_TCP 2
+#define RDS_TRANS_COUNT 3
+#define RDS_TRANS_NONE (~0)
+
+/*
+ * 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.
+ * RDS_CMSG_RXPATH_LATENCY(recvmsg)
+ * Returns rds message latencies in various stages of receive
+ * path in nS. Its set per socket using SO_RDS_MSG_RXPATH_LATENCY
+ * socket option. Legitimate points are defined in
+ * enum rds_message_rxpath_latency. More points can be added in
+ * future. CSMG format is struct rds_cmsg_rx_trace.
+ */
+#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_CMSG_ATOMIC_FADD 6
+#define RDS_CMSG_ATOMIC_CSWP 7
+#define RDS_CMSG_MASKED_ATOMIC_FADD 8
+#define RDS_CMSG_MASKED_ATOMIC_CSWP 9
+#define RDS_CMSG_RXPATH_LATENCY 11
+#define RDS_CMSG_ZCOPY_COOKIE 12
+#define RDS_CMSG_ZCOPY_COMPLETION 13
+
+#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
+
+/* PF_RDS6 options */
+#define RDS6_INFO_CONNECTIONS 10011
+#define RDS6_INFO_SEND_MESSAGES 10012
+#define RDS6_INFO_RETRANS_MESSAGES 10013
+#define RDS6_INFO_RECV_MESSAGES 10014
+#define RDS6_INFO_SOCKETS 10015
+#define RDS6_INFO_TCP_SOCKETS 10016
+#define RDS6_INFO_IB_CONNECTIONS 10017
+
+#define RDS_INFO_LAST 10017
+
+struct rds_info_counter {
+ __u8 name[32];
+ __u64 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 {
+ __u64 next_tx_seq;
+ __u64 next_rx_seq;
+ __be32 laddr;
+ __be32 faddr;
+ __u8 transport[TRANSNAMSIZ]; /* null term ascii */
+ __u8 flags;
+} __attribute__((packed));
+
+struct rds6_info_connection {
+ __u64 next_tx_seq;
+ __u64 next_rx_seq;
+ struct in6_addr laddr;
+ struct in6_addr faddr;
+ __u8 transport[TRANSNAMSIZ]; /* null term ascii */
+ __u8 flags;
+} __attribute__((packed));
+
+#define RDS_INFO_MESSAGE_FLAG_ACK 0x01
+#define RDS_INFO_MESSAGE_FLAG_FAST_ACK 0x02
+
+struct rds_info_message {
+ __u64 seq;
+ __u32 len;
+ __be32 laddr;
+ __be32 faddr;
+ __be16 lport;
+ __be16 fport;
+ __u8 flags;
+} __attribute__((packed));
+
+struct rds6_info_message {
+ __u64 seq;
+ __u32 len;
+ struct in6_addr laddr;
+ struct in6_addr faddr;
+ __be16 lport;
+ __be16 fport;
+ __u8 flags;
+ __u8 tos;
+} __attribute__((packed));
+
+struct rds_info_socket {
+ __u32 sndbuf;
+ __be32 bound_addr;
+ __be32 connected_addr;
+ __be16 bound_port;
+ __be16 connected_port;
+ __u32 rcvbuf;
+ __u64 inum;
+} __attribute__((packed));
+
+struct rds6_info_socket {
+ __u32 sndbuf;
+ struct in6_addr bound_addr;
+ struct in6_addr connected_addr;
+ __be16 bound_port;
+ __be16 connected_port;
+ __u32 rcvbuf;
+ __u64 inum;
+} __attribute__((packed));
+
+struct rds_info_tcp_socket {
+ __be32 local_addr;
+ __be16 local_port;
+ __be32 peer_addr;
+ __be16 peer_port;
+ __u64 hdr_rem;
+ __u64 data_rem;
+ __u32 last_sent_nxt;
+ __u32 last_expected_una;
+ __u32 last_seen_una;
+} __attribute__((packed));
+
+struct rds6_info_tcp_socket {
+ struct in6_addr local_addr;
+ __be16 local_port;
+ struct in6_addr peer_addr;
+ __be16 peer_port;
+ __u64 hdr_rem;
+ __u64 data_rem;
+ __u32 last_sent_nxt;
+ __u32 last_expected_una;
+ __u32 last_seen_una;
+} __attribute__((packed));
+
+#define RDS_IB_GID_LEN 16
+struct rds_info_rdma_connection {
+ __be32 src_addr;
+ __be32 dst_addr;
+ __u8 src_gid[RDS_IB_GID_LEN];
+ __u8 dst_gid[RDS_IB_GID_LEN];
+
+ __u32 max_send_wr;
+ __u32 max_recv_wr;
+ __u32 max_send_sge;
+ __u32 rdma_mr_max;
+ __u32 rdma_mr_size;
+};
+
+struct rds6_info_rdma_connection {
+ struct in6_addr src_addr;
+ struct in6_addr dst_addr;
+ __u8 src_gid[RDS_IB_GID_LEN];
+ __u8 dst_gid[RDS_IB_GID_LEN];
+
+ __u32 max_send_wr;
+ __u32 max_recv_wr;
+ __u32 max_send_sge;
+ __u32 rdma_mr_max;
+ __u32 rdma_mr_size;
+};
+
+/* RDS message Receive Path Latency points */
+enum rds_message_rxpath_latency {
+ RDS_MSG_RX_HDR_TO_DGRAM_START = 0,
+ RDS_MSG_RX_DGRAM_REASSEMBLE,
+ RDS_MSG_RX_DGRAM_DELIVERED,
+ RDS_MSG_RX_DGRAM_TRACE_MAX
+};
+
+struct rds_rx_trace_so {
+ __u8 rx_traces;
+ __u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
+};
+
+struct rds_cmsg_rx_trace {
+ __u8 rx_traces;
+ __u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
+ __u64 rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
+};
+
+/*
+ * 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 __u64 rds_rdma_cookie_t;
+
+struct rds_iovec {
+ __u64 addr;
+ __u64 bytes;
+};
+
+struct rds_get_mr_args {
+ struct rds_iovec vec;
+ __u64 cookie_addr;
+ __u64 flags;
+};
+
+struct rds_get_mr_for_dest_args {
+ struct __kernel_sockaddr_storage dest_addr;
+ struct rds_iovec vec;
+ __u64 cookie_addr;
+ __u64 flags;
+};
+
+struct rds_free_mr_args {
+ rds_rdma_cookie_t cookie;
+ __u64 flags;
+};
+
+struct rds_rdma_args {
+ rds_rdma_cookie_t cookie;
+ struct rds_iovec remote_vec;
+ __u64 local_vec_addr;
+ __u64 nr_local;
+ __u64 flags;
+ __u64 user_token;
+};
+
+struct rds_atomic_args {
+ rds_rdma_cookie_t cookie;
+ __u64 local_addr;
+ __u64 remote_addr;
+ union {
+ struct {
+ __u64 compare;
+ __u64 swap;
+ } cswp;
+ struct {
+ __u64 add;
+ } fadd;
+ struct {
+ __u64 compare;
+ __u64 swap;
+ __u64 compare_mask;
+ __u64 swap_mask;
+ } m_cswp;
+ struct {
+ __u64 add;
+ __u64 nocarry_mask;
+ } m_fadd;
+ };
+ __u64 flags;
+ __u64 user_token;
+};
+
+struct rds_rdma_notify {
+ __u64 user_token;
+ __s32 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
+
+#define RDS_MAX_ZCOOKIES 8
+struct rds_zcopy_cookies {
+ __u32 num;
+ __u32 cookies[RDS_MAX_ZCOOKIES];
+};
+
+/*
+ * 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 */
+#define RDS_RDMA_SILENT 0x0040 /* Do not interrupt remote */
+
+#endif /* IB_RDS_H */