blob: dc360252c51573a1281b14bdba5e530b3bae0b26 [file] [log] [blame]
/* 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_MAJOR(v) ((v) >> 8)
#define RDS_PROTOCOL_MINOR(v) ((v) & 255)
#define RDS_PROTOCOL(maj, min) (((maj) << 8) | min)
/* 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
#ifdef RDS_DEBUG
#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
/* sigh, pr_debug() causes unused variable warnings */
static inline __printf(1, 2)
void rdsdebug(char *fmt, ...)
#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)
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 {
/* Bits for c_flags */
#define RDS_LL_SEND_FULL 0
#define RDS_IN_XMIT 2
/* Max number of multipaths per RDS connection. Must be a power of 2 */
#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,
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_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_HS_PROBE(sport, dport) \
((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
(sport == 0 && dport == RDS_FLAG_PROBE_PORT))
* Maximum space available for extension headers.
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
* 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).
struct rds_ext_header_version {
__be32 h_version;
* This extension header is included in the RDS message
* chasing an RDMA operation.
struct rds_ext_header_rdma {
__be32 h_rdma_rkey;
* This extension header tells the peer about the
* destination <R_Key,offset> of the requested RDMA
* operation.
struct rds_ext_header_rdma_dest {
__be32 h_rdma_rkey;
__be32 h_rdma_offset;
/* Extension header announcing number of paths.
* Implicit length = 2 bytes.
#define __RDS_EXTHDR_MAX 16 /* for now */
#define RDS_MSG_RX_HDR 0
#define RDS_MSG_RX_START 1
#define RDS_MSG_RX_END 2
#define RDS_MSG_RX_CMSG 3
/* The following values are whitelisted for usercopy */
struct rds_inc_usercopy {
rds_rdma_cookie_t rdma_cookie;
ktime_t rx_tstamp;
struct rds_incoming {
refcount_t i_refcount;
struct list_head i_item;
struct rds_connection *i_conn;
struct rds_conn_path *i_conn_path;
struct rds_header i_hdr;
unsigned long i_rx_jiffies;
struct in6_addr i_saddr;
struct rds_inc_usercopy i_usercopy;
u64 i_rx_lat_trace[RDS_RX_MAX_TRACES];
struct rds_mr {
struct rb_node r_rb_node;
struct kref r_kref;
u32 r_key;
/* A copy of the creation flags */
unsigned int r_use_once:1;
unsigned int r_invalidate:1;
unsigned int r_write:1;
struct rds_sock *r_sock; /* back pointer to the socket that owns us */
struct rds_transport *r_trans;
void *r_trans_private;
static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
return r_key | (((u64) offset) << 32);
static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
return cookie;
static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
return cookie >> 32;
/* atomic operation types */
* m_sock_item and m_conn_item are on lists that are serialized under
* conn->c_lock. m_sock_item has additional meaning in that once it is empty
* the message will not be put back on the retransmit list after being sent.
* messages that are canceled while being sent rely on this.
* m_inc is used by loopback so that it can pass an incoming message straight
* back up into the rx path. It embeds a wire header which is also used by
* the send path, which is kind of awkward.
* m_sock_item indicates the message's presence on a socket's send or receive
* queue. m_rs will point to that socket.
* m_daddr is used by cancellation to prune messages to a given destination.
* The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
* nesting. As paths iterate over messages on a sock, or conn, they must
* also lock the conn, or sock, to remove the message from those lists too.
* Testing the flag to determine if the message is still on the lists lets
* us avoid testing the list_head directly. That means each path can use
* the message's list_head to keep it on a local list while juggling locks
* without confusing the other path.
* m_ack_seq is an optional field set by transports who need a different
* sequence number range to invalidate. They can use this in a callback
* that they pass to rds_send_drop_acked() to see if each message has been
* acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
* had ack_seq set yet.
#define RDS_MSG_ON_SOCK 1
#define RDS_MSG_ON_CONN 2
#define RDS_MSG_MAPPED 6
#define RDS_MSG_FLUSH 8
struct rds_znotifier {
struct mmpin z_mmp;
u32 z_cookie;
struct rds_msg_zcopy_info {
struct list_head rs_zcookie_next;
union {
struct rds_znotifier znotif;
struct rds_zcopy_cookies zcookies;
struct rds_msg_zcopy_queue {
struct list_head zcookie_head;
spinlock_t lock; /* protects zcookie_head queue */
static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q)
struct rds_iov_vector {
struct rds_iovec *iov;
int len;
struct rds_iov_vector_arr {
struct rds_iov_vector *vec;
int len;
int indx;
int incr;
struct rds_message {
refcount_t m_refcount;
struct list_head m_sock_item;
struct list_head m_conn_item;
struct rds_incoming m_inc;
u64 m_ack_seq;
struct in6_addr m_daddr;
unsigned long m_flags;
/* Never access m_rs without holding m_rs_lock.
* Lock nesting is
* rm->m_rs_lock
* -> rs->rs_lock
spinlock_t m_rs_lock;
wait_queue_head_t m_flush_wait;
struct rds_sock *m_rs;
/* cookie to send to remote, in rds header */
rds_rdma_cookie_t m_rdma_cookie;
unsigned int m_used_sgs;
unsigned int m_total_sgs;
void *m_final_op;
struct {
struct rm_atomic_op {
int op_type;
union {
struct {
uint64_t compare;
uint64_t swap;
uint64_t compare_mask;
uint64_t swap_mask;
} op_m_cswp;
struct {
uint64_t add;
uint64_t nocarry_mask;
} op_m_fadd;
u32 op_rkey;
u64 op_remote_addr;
unsigned int op_notify:1;
unsigned int op_recverr:1;
unsigned int op_mapped:1;
unsigned int op_silent:1;
unsigned int op_active:1;
struct scatterlist *op_sg;
struct rds_notifier *op_notifier;
struct rds_mr *op_rdma_mr;
} atomic;
struct rm_rdma_op {
u32 op_rkey;
u64 op_remote_addr;
unsigned int op_write:1;
unsigned int op_fence:1;
unsigned int op_notify:1;
unsigned int op_recverr:1;
unsigned int op_mapped:1;
unsigned int op_silent:1;
unsigned int op_active:1;
unsigned int op_bytes;
unsigned int op_nents;
unsigned int op_count;
struct scatterlist *op_sg;
struct rds_notifier *op_notifier;
struct rds_mr *op_rdma_mr;
u64 op_odp_addr;
struct rds_mr *op_odp_mr;
} rdma;
struct rm_data_op {
unsigned int op_active:1;
unsigned int op_nents;
unsigned int op_count;
unsigned int op_dmasg;
unsigned int op_dmaoff;
struct rds_znotifier *op_mmp_znotifier;
struct scatterlist *op_sg;
} data;
struct rds_conn_path *m_conn_path;
* The RDS notifier is used (optionally) to tell the application about
* completed RDMA operations. Rather than keeping the whole rds message
* around on the queue, we allocate a small notifier that is put on the
* socket's notifier_list. Notifications are delivered to the application
* through control messages.
struct rds_notifier {
struct list_head n_list;
uint64_t n_user_token;
int n_status;
/* Available as part of RDS core, so doesn't need to participate
* in get_preferred transport etc
#define RDS_TRANS_LOOP 3
* struct rds_transport - transport specific behavioural hooks
* @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
* part of a message. The caller serializes on the send_sem so this
* doesn't need to be reentrant for a given conn. The header must be
* sent before the data payload. .xmit must be prepared to send a
* message with no data payload. .xmit should return the number of
* bytes that were sent down the connection, including header bytes.
* Returning 0 tells the caller that it doesn't need to perform any
* additional work now. This is usually the case when the transport has
* filled the sending queue for its connection and will handle
* triggering the rds thread to continue the send when space becomes
* available. Returning -EAGAIN tells the caller to retry the send
* immediately. Returning -ENOMEM tells the caller to retry the send at
* some point in the future.
* @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
* it returns the connection can not call rds_recv_incoming().
* This will only be called once after conn_connect returns
* non-zero success and will The caller serializes this with
* the send and connecting paths (xmit_* and conn_*). The
* transport is responsible for other serialization, including
* rds_recv_incoming(). This is called in process context but
* should try hard not to block.
struct rds_transport {
char t_name[TRANSNAMSIZ];
struct list_head t_item;
struct module *t_owner;
unsigned int t_prefer_loopback:1,
unsigned int t_type;
int (*laddr_check)(struct net *net, const struct in6_addr *addr,
__u32 scope_id);
int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
void (*conn_free)(void *data);
int (*conn_path_connect)(struct rds_conn_path *cp);
void (*conn_path_shutdown)(struct rds_conn_path *conn);
void (*xmit_path_prepare)(struct rds_conn_path *cp);
void (*xmit_path_complete)(struct rds_conn_path *cp);
int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
unsigned int hdr_off, unsigned int sg, unsigned int off);
int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
int (*recv_path)(struct rds_conn_path *cp);
int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
void (*inc_free)(struct rds_incoming *inc);
int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
struct rdma_cm_event *event, bool isv6);
int (*cm_initiate_connect)(struct rdma_cm_id *cm_id, bool isv6);
void (*cm_connect_complete)(struct rds_connection *conn,
struct rdma_cm_event *event);
unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
unsigned int avail);
void (*exit)(void);
void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
struct rds_sock *rs, u32 *key_ret,
struct rds_connection *conn,
u64 start, u64 length, int need_odp);
void (*sync_mr)(void *trans_private, int direction);
void (*free_mr)(void *trans_private, int invalidate);
void (*flush_mrs)(void);
bool (*t_unloading)(struct rds_connection *conn);
u8 (*get_tos_map)(u8 tos);
/* Bind hash table key length. It is the sum of the size of a struct
* in6_addr, a scope_id and a port.
(sizeof(struct in6_addr) + sizeof(__u32) + sizeof(__be16))
struct rds_sock {
struct sock rs_sk;
u64 rs_user_addr;
u64 rs_user_bytes;
* bound_addr used for both incoming and outgoing, no INADDR_ANY
* support.
struct rhash_head rs_bound_node;
u8 rs_bound_key[RDS_BOUND_KEY_LEN];
struct sockaddr_in6 rs_bound_sin6;
#define rs_bound_addr rs_bound_sin6.sin6_addr
#define rs_bound_addr_v4 rs_bound_sin6.sin6_addr.s6_addr32[3]
#define rs_bound_port rs_bound_sin6.sin6_port
#define rs_bound_scope_id rs_bound_sin6.sin6_scope_id
struct in6_addr rs_conn_addr;
#define rs_conn_addr_v4 rs_conn_addr.s6_addr32[3]
__be16 rs_conn_port;
struct rds_transport *rs_transport;
* rds_sendmsg caches the conn it used the last time around.
* This helps avoid costly lookups.
struct rds_connection *rs_conn;
/* flag indicating we were congested or not */
int rs_congested;
/* seen congestion (ENOBUFS) when sending? */
int rs_seen_congestion;
/* rs_lock protects all these adjacent members before the newline */
spinlock_t rs_lock;
struct list_head rs_send_queue;
u32 rs_snd_bytes;
int rs_rcv_bytes;
struct list_head rs_notify_queue; /* currently used for failed RDMAs */
/* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
* to decide whether the application should be woken up.
* If not set, we use rs_cong_track to find out whether a cong map
* update arrived.
uint64_t rs_cong_mask;
uint64_t rs_cong_notify;
struct list_head rs_cong_list;
unsigned long rs_cong_track;
* rs_recv_lock protects the receive queue, and is
* used to serialize with rds_release.
rwlock_t rs_recv_lock;
struct list_head rs_recv_queue;
/* just for stats reporting */
struct list_head rs_item;
/* these have their own lock */
spinlock_t rs_rdma_lock;
struct rb_root rs_rdma_keys;
/* Socket options - in case there will be more */
unsigned char rs_recverr,
u32 rs_hash_initval;
/* Socket receive path trace points*/
u8 rs_rx_traces;
u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
struct rds_msg_zcopy_queue rs_zcookie_queue;
u8 rs_tos;
static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
return container_of(sk, struct rds_sock, rs_sk);
static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
return &rs->rs_sk;
* The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
* to account for overhead. We don't account for overhead, we just apply
* the number of payload bytes to the specified value.
static inline int rds_sk_sndbuf(struct rds_sock *rs)
return rds_rs_to_sk(rs)->sk_sndbuf / 2;
static inline int rds_sk_rcvbuf(struct rds_sock *rs)
return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
struct rds_statistics {
uint64_t s_conn_reset;
uint64_t s_recv_drop_bad_checksum;
uint64_t s_recv_drop_old_seq;
uint64_t s_recv_drop_no_sock;
uint64_t s_recv_drop_dead_sock;
uint64_t s_recv_deliver_raced;
uint64_t s_recv_delivered;
uint64_t s_recv_queued;
uint64_t s_recv_immediate_retry;
uint64_t s_recv_delayed_retry;
uint64_t s_recv_ack_required;
uint64_t s_recv_rdma_bytes;
uint64_t s_recv_ping;
uint64_t s_send_queue_empty;
uint64_t s_send_queue_full;
uint64_t s_send_lock_contention;
uint64_t s_send_lock_queue_raced;
uint64_t s_send_immediate_retry;
uint64_t s_send_delayed_retry;
uint64_t s_send_drop_acked;
uint64_t s_send_ack_required;
uint64_t s_send_queued;
uint64_t s_send_rdma;
uint64_t s_send_rdma_bytes;
uint64_t s_send_pong;
uint64_t s_page_remainder_hit;
uint64_t s_page_remainder_miss;
uint64_t s_copy_to_user;
uint64_t s_copy_from_user;
uint64_t s_cong_update_queued;
uint64_t s_cong_update_received;
uint64_t s_cong_send_error;
uint64_t s_cong_send_blocked;
uint64_t s_recv_bytes_added_to_socket;
uint64_t s_recv_bytes_removed_from_socket;
uint64_t s_send_stuck_rm;
/* af_rds.c */
void rds_sock_addref(struct rds_sock *rs);
void rds_sock_put(struct rds_sock *rs);
void rds_wake_sk_sleep(struct rds_sock *rs);
static inline void __rds_wake_sk_sleep(struct sock *sk)
wait_queue_head_t *waitq = sk_sleep(sk);
if (!sock_flag(sk, SOCK_DEAD) && waitq)
extern wait_queue_head_t rds_poll_waitq;
/* bind.c */
int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
void rds_remove_bound(struct rds_sock *rs);
struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port,
__u32 scope_id);
int rds_bind_lock_init(void);
void rds_bind_lock_destroy(void);
/* cong.c */
int rds_cong_get_maps(struct rds_connection *conn);
void rds_cong_add_conn(struct rds_connection *conn);
void rds_cong_remove_conn(struct rds_connection *conn);
void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
void rds_cong_queue_updates(struct rds_cong_map *map);
void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
int rds_cong_updated_since(unsigned long *recent);
void rds_cong_add_socket(struct rds_sock *);
void rds_cong_remove_socket(struct rds_sock *);
void rds_cong_exit(void);
struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
/* connection.c */
extern u32 rds_gen_num;
int rds_conn_init(void);
void rds_conn_exit(void);
struct rds_connection *rds_conn_create(struct net *net,
const struct in6_addr *laddr,
const struct in6_addr *faddr,
struct rds_transport *trans,
u8 tos, gfp_t gfp,
int dev_if);
struct rds_connection *rds_conn_create_outgoing(struct net *net,
const struct in6_addr *laddr,
const struct in6_addr *faddr,
struct rds_transport *trans,
u8 tos, gfp_t gfp, int dev_if);
void rds_conn_shutdown(struct rds_conn_path *cpath);
void rds_conn_destroy(struct rds_connection *conn);
void rds_conn_drop(struct rds_connection *conn);
void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy);
void rds_conn_connect_if_down(struct rds_connection *conn);
void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
void rds_check_all_paths(struct rds_connection *conn);
void rds_for_each_conn_info(struct socket *sock, unsigned int len,
struct rds_info_iterator *iter,
struct rds_info_lengths *lens,
int (*visitor)(struct rds_connection *, void *),
u64 *buffer,
size_t item_len);
__printf(2, 3)
void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...);
#define rds_conn_path_error(cp, fmt...) \
__rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
static inline int
rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
return atomic_cmpxchg(&cp->cp_state, old, new) == old;
static inline int
rds_conn_transition(struct rds_connection *conn, int old, int new)
return rds_conn_path_transition(&conn->c_path[0], old, new);
static inline int
rds_conn_path_state(struct rds_conn_path *cp)
return atomic_read(&cp->cp_state);
static inline int
rds_conn_state(struct rds_connection *conn)
return rds_conn_path_state(&conn->c_path[0]);
static inline int
rds_conn_path_up(struct rds_conn_path *cp)
return atomic_read(&cp->cp_state) == RDS_CONN_UP;
static inline int
rds_conn_path_down(struct rds_conn_path *cp)
return atomic_read(&cp->cp_state) == RDS_CONN_DOWN;
static inline int
rds_conn_up(struct rds_connection *conn)
return rds_conn_path_up(&conn->c_path[0]);
static inline int
rds_conn_path_connecting(struct rds_conn_path *cp)
return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
static inline int
rds_conn_connecting(struct rds_connection *conn)
return rds_conn_path_connecting(&conn->c_path[0]);
/* message.c */
struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
bool zcopy);
struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
__be16 dport, u64 seq);
int rds_message_add_extension(struct rds_header *hdr,
unsigned int type, const void *data, unsigned int len);
int rds_message_next_extension(struct rds_header *hdr,
unsigned int *pos, void *buf, unsigned int *buflen);
int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
void rds_message_addref(struct rds_message *rm);
void rds_message_put(struct rds_message *rm);
void rds_message_wait(struct rds_message *rm);
void rds_message_unmapped(struct rds_message *rm);
void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info);
static inline void rds_message_make_checksum(struct rds_header *hdr)
hdr->h_csum = 0;
hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
static inline int rds_message_verify_checksum(const struct rds_header *hdr)
return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
/* page.c */
int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
gfp_t gfp);
void rds_page_exit(void);
/* recv.c */
void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
struct in6_addr *saddr);
void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
struct in6_addr *saddr);
void rds_inc_put(struct rds_incoming *inc);
void rds_recv_incoming(struct rds_connection *conn, struct in6_addr *saddr,
struct in6_addr *daddr,
struct rds_incoming *inc, gfp_t gfp);
int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
int msg_flags);
void rds_clear_recv_queue(struct rds_sock *rs);
int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
void rds_inc_info_copy(struct rds_incoming *inc,
struct rds_info_iterator *iter,
__be32 saddr, __be32 daddr, int flip);
void rds6_inc_info_copy(struct rds_incoming *inc,
struct rds_info_iterator *iter,
struct in6_addr *saddr, struct in6_addr *daddr,
int flip);
/* send.c */
int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
void rds_send_path_reset(struct rds_conn_path *conn);
int rds_send_xmit(struct rds_conn_path *cp);
struct sockaddr_in;
void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in6 *dest);
typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
is_acked_func is_acked);
void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
is_acked_func is_acked);
void rds_send_ping(struct rds_connection *conn, int cp_index);
int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
/* rdma.c */
void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
int rds_get_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
int rds_get_mr_for_dest(struct rds_sock *rs, sockptr_t optval, int optlen);
int rds_free_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
void rds_rdma_drop_keys(struct rds_sock *rs);
int rds_rdma_extra_size(struct rds_rdma_args *args,
struct rds_iov_vector *iov);
int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg,
struct rds_iov_vector *vec);
int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
void rds_rdma_free_op(struct rm_rdma_op *ro);
void rds_atomic_free_op(struct rm_atomic_op *ao);
void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
struct cmsghdr *cmsg);
void __rds_put_mr_final(struct kref *kref);
static inline bool rds_destroy_pending(struct rds_connection *conn)
return !check_net(rds_conn_net(conn)) ||
(conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn));
enum {
/* stats.c */
DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
#define rds_stats_inc_which(which, member) do { \
per_cpu(which, get_cpu()).member++; \
put_cpu(); \
} while (0)
#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
#define rds_stats_add_which(which, member, count) do { \
per_cpu(which, get_cpu()).member += count; \
put_cpu(); \
} while (0)
#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
int rds_stats_init(void);
void rds_stats_exit(void);
void rds_stats_info_copy(struct rds_info_iterator *iter,
uint64_t *values, const char *const *names,
size_t nr);
/* sysctl.c */
int rds_sysctl_init(void);
void rds_sysctl_exit(void);
extern unsigned long rds_sysctl_sndbuf_min;
extern unsigned long rds_sysctl_sndbuf_default;
extern unsigned long rds_sysctl_sndbuf_max;
extern unsigned long rds_sysctl_reconnect_min_jiffies;
extern unsigned long rds_sysctl_reconnect_max_jiffies;
extern unsigned int rds_sysctl_max_unacked_packets;
extern unsigned int rds_sysctl_max_unacked_bytes;
extern unsigned int rds_sysctl_ping_enable;
extern unsigned long rds_sysctl_trace_flags;
extern unsigned int rds_sysctl_trace_level;
/* threads.c */
int rds_threads_init(void);
void rds_threads_exit(void);
extern struct workqueue_struct *rds_wq;
void rds_queue_reconnect(struct rds_conn_path *cp);
void rds_connect_worker(struct work_struct *);
void rds_shutdown_worker(struct work_struct *);
void rds_send_worker(struct work_struct *);
void rds_recv_worker(struct work_struct *);
void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
void rds_connect_complete(struct rds_connection *conn);
int rds_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2);
/* transport.c */
void rds_trans_register(struct rds_transport *trans);
void rds_trans_unregister(struct rds_transport *trans);
struct rds_transport *rds_trans_get_preferred(struct net *net,
const struct in6_addr *addr,
__u32 scope_id);
void rds_trans_put(struct rds_transport *trans);
unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
unsigned int avail);
struct rds_transport *rds_trans_get(int t_type);