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/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR Linux-OpenIB) */
/*
* 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>
#include <linux/socket.h> /* For __kernel_sockaddr_storage. */
#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
#define RDS_INFO_LAST 10010
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));
#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 rds_info_socket {
__u32 sndbuf;
__be32 bound_addr;
__be32 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));
#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;
};
/* 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 */