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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _RDS_RDS_H
#define _RDS_RDS_H
#include <net/sock.h>
#include <linux/scatterlist.h>
#include <linux/highmem.h>
#include <rdma/rdma_cm.h>
#include <linux/mutex.h>
#include <linux/rds.h>
#include <linux/rhashtable.h>
#include <linux/refcount.h>
#include <linux/in6.h>
#include "info.h"
/*
* RDS Network protocol version
*/
#define RDS_PROTOCOL_3_0 0x0300
#define RDS_PROTOCOL_3_1 0x0301
#define RDS_PROTOCOL_4_0 0x0400
#define RDS_PROTOCOL_4_1 0x0401
#define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1
#define RDS_PROTOCOL_MAJOR(v) ((v) >> 8)
#define RDS_PROTOCOL_MINOR(v) ((v) & 255)
#define RDS_PROTOCOL(maj, min) (((maj) << 8) | min)
#define RDS_PROTOCOL_COMPAT_VERSION RDS_PROTOCOL_3_1
/* The following ports, 16385, 18634, 18635, are registered with IANA as
* the ports to be used for RDS over TCP and UDP. Currently, only RDS over
* TCP and RDS over IB/RDMA are implemented. 18634 is the historical value
* used for the RDMA_CM listener port. RDS/TCP uses port 16385. After
* IPv6 work, RDMA_CM also uses 16385 as the listener port. 18634 is kept
* to ensure compatibility with older RDS modules. Those ports are defined
* in each transport's header file.
*/
#define RDS_PORT 18634
#ifdef ATOMIC64_INIT
#define KERNEL_HAS_ATOMIC64
#endif
#ifdef RDS_DEBUG
#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
#else
/* sigh, pr_debug() causes unused variable warnings */
static inline __printf(1, 2)
void rdsdebug(char *fmt, ...)
{
}
#endif
#define RDS_FRAG_SHIFT 12
#define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT))
/* Used to limit both RDMA and non-RDMA RDS message to 1MB */
#define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20))
#define RDS_CONG_MAP_BYTES (65536 / 8)
#define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
#define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8)
struct rds_cong_map {
struct rb_node m_rb_node;
struct in6_addr m_addr;
wait_queue_head_t m_waitq;
struct list_head m_conn_list;
unsigned long m_page_addrs[RDS_CONG_MAP_PAGES];
};
/*
* This is how we will track the connection state:
* A connection is always in one of the following
* states. Updates to the state are atomic and imply
* a memory barrier.
*/
enum {
RDS_CONN_DOWN = 0,
RDS_CONN_CONNECTING,
RDS_CONN_DISCONNECTING,
RDS_CONN_UP,
RDS_CONN_RESETTING,
RDS_CONN_ERROR,
};
/* Bits for c_flags */
#define RDS_LL_SEND_FULL 0
#define RDS_RECONNECT_PENDING 1
#define RDS_IN_XMIT 2
#define RDS_RECV_REFILL 3
#define RDS_DESTROY_PENDING 4
/* Max number of multipaths per RDS connection. Must be a power of 2 */
#define RDS_MPATH_WORKERS 8
#define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
(rs)->rs_hash_initval) & ((n) - 1))
#define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr))
/* Per mpath connection state */
struct rds_conn_path {
struct rds_connection *cp_conn;
struct rds_message *cp_xmit_rm;
unsigned long cp_xmit_sg;
unsigned int cp_xmit_hdr_off;
unsigned int cp_xmit_data_off;
unsigned int cp_xmit_atomic_sent;
unsigned int cp_xmit_rdma_sent;
unsigned int cp_xmit_data_sent;
spinlock_t cp_lock; /* protect msg queues */
u64 cp_next_tx_seq;
struct list_head cp_send_queue;
struct list_head cp_retrans;
u64 cp_next_rx_seq;
void *cp_transport_data;
atomic_t cp_state;
unsigned long cp_send_gen;
unsigned long cp_flags;
unsigned long cp_reconnect_jiffies;
struct delayed_work cp_send_w;
struct delayed_work cp_recv_w;
struct delayed_work cp_conn_w;
struct work_struct cp_down_w;
struct mutex cp_cm_lock; /* protect cp_state & cm */
wait_queue_head_t cp_waitq;
unsigned int cp_unacked_packets;
unsigned int cp_unacked_bytes;
unsigned int cp_index;
};
/* One rds_connection per RDS address pair */
struct rds_connection {
struct hlist_node c_hash_node;
struct in6_addr c_laddr;
struct in6_addr c_faddr;
int c_dev_if; /* ifindex used for this conn */
int c_bound_if; /* ifindex of c_laddr */
unsigned int c_loopback:1,
c_isv6:1,
c_ping_triggered:1,
c_pad_to_32:29;
int c_npaths;
struct rds_connection *c_passive;
struct rds_transport *c_trans;
struct rds_cong_map *c_lcong;
struct rds_cong_map *c_fcong;
/* Protocol version */
unsigned int c_proposed_version;
unsigned int c_version;
possible_net_t c_net;
/* TOS */
u8 c_tos;
struct list_head c_map_item;
unsigned long c_map_queued;
struct rds_conn_path *c_path;
wait_queue_head_t c_hs_waitq; /* handshake waitq */
u32 c_my_gen_num;
u32 c_peer_gen_num;
};
static inline
struct net *rds_conn_net(struct rds_connection *conn)
{
return read_pnet(&conn->c_net);
}
static inline
void rds_conn_net_set(struct rds_connection *conn, struct net *net)
{
write_pnet(&conn->c_net, net);
}
#define RDS_FLAG_CONG_BITMAP 0x01
#define RDS_FLAG_ACK_REQUIRED 0x02
#define RDS_FLAG_RETRANSMITTED 0x04
#define RDS_MAX_ADV_CREDIT 255
/* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
* probe to exchange control information before establishing a connection.
* Currently the control information that is exchanged is the number of
* supported paths. If the peer is a legacy (older kernel revision) peer,
* it would return a pong message without additional control information
* that would then alert the sender that the peer was an older rev.
*/
#define RDS_FLAG_PROBE_PORT 1
#define RDS_HS_PROBE(sport, dport) \
((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
(sport == 0 && dport == RDS_FLAG_PROBE_PORT))
/*
* Maximum space available for extension headers.
*/
#define RDS_HEADER_EXT_SPACE 16
struct rds_header {
__be64 h_sequence;
__be64 h_ack;
__be32 h_len;
__be16 h_sport;
__be16 h_dport;
u8 h_flags;
u8 h_credit;
u8 h_padding[4];
__sum16 h_csum;
u8 h_exthdr[RDS_HEADER_EXT_SPACE];
};
/*
* Reserved - indicates end of extensions
*/
#define RDS_EXTHDR_NONE 0
/*
* This extension header is included in the very
* first message that is sent on a new connection,
* and identifies the protocol level. This will help
* rolling updates if a future change requires breaking
* the protocol.
* NB: This is no longer true for IB, where we do a version
* negotiation during the connection setup phase (protocol
* version information is included in the RDMA CM private data).
*/
#define RDS_EXTHDR_VERSION 1
struc
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