diff options
Diffstat (limited to 'net/rds/rds.h')
| -rw-r--r-- | net/rds/rds.h | 690 |
1 files changed, 690 insertions, 0 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h new file mode 100644 index 000000000000..619f0a30a4e5 --- /dev/null +++ b/net/rds/rds.h @@ -0,0 +1,690 @@ +#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 "info.h" + +/* + * RDS Network protocol version + */ +#define RDS_PROTOCOL_3_0 0x0300 +#define RDS_PROTOCOL_3_1 0x0301 +#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) + +/* + * XXX randomly chosen, but at least seems to be unused: + * # 18464-18768 Unassigned + * We should do better. We want a reserved port to discourage unpriv'ed + * userspace from listening. + */ +#define RDS_PORT 18634 + +#ifdef ATOMIC64_INIT +#define KERNEL_HAS_ATOMIC64 +#endif + +#ifdef DEBUG +#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) +#else +/* sigh, pr_debug() causes unused variable warnings */ +static inline void __attribute__ ((format (printf, 1, 2))) +rdsdebug(char *fmt, ...) +{ +} +#endif + +/* XXX is there one of these somewhere? */ +#define ceil(x, y) \ + ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) + +#define RDS_FRAG_SHIFT 12 +#define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) + +#define RDS_CONG_MAP_BYTES (65536 / 8) +#define RDS_CONG_MAP_LONGS (RDS_CONG_MAP_BYTES / sizeof(unsigned long)) +#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; + __be32 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_ERROR, +}; + +/* Bits for c_flags */ +#define RDS_LL_SEND_FULL 0 +#define RDS_RECONNECT_PENDING 1 + +struct rds_connection { + struct hlist_node c_hash_node; + __be32 c_laddr; + __be32 c_faddr; + unsigned int c_loopback:1; + struct rds_connection *c_passive; + + struct rds_cong_map *c_lcong; + struct rds_cong_map *c_fcong; + + struct mutex c_send_lock; /* protect send ring */ + struct rds_message *c_xmit_rm; + unsigned long c_xmit_sg; + unsigned int c_xmit_hdr_off; + unsigned int c_xmit_data_off; + unsigned int c_xmit_rdma_sent; + + spinlock_t c_lock; /* protect msg queues */ + u64 c_next_tx_seq; + struct list_head c_send_queue; + struct list_head c_retrans; + + u64 c_next_rx_seq; + + struct rds_transport *c_trans; + void *c_transport_data; + + atomic_t c_state; + unsigned long c_flags; + unsigned long c_reconnect_jiffies; + struct delayed_work c_send_w; + struct delayed_work c_recv_w; + struct delayed_work c_conn_w; + struct work_struct c_down_w; + struct mutex c_cm_lock; /* protect conn state & cm */ + + struct list_head c_map_item; + unsigned long c_map_queued; + unsigned long c_map_offset; + unsigned long c_map_bytes; + + unsigned int c_unacked_packets; + unsigned int c_unacked_bytes; + + /* Protocol version */ + unsigned int c_version; +}; + +#define RDS_FLAG_CONG_BITMAP 0x01 +#define RDS_FLAG_ACK_REQUIRED 0x02 +#define RDS_FLAG_RETRANSMITTED 0x04 +#define RDS_MAX_ADV_CREDIT 127 + +/* + * 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 +struct rds_ext_header_version { + __be32 h_version; +}; + +/* + * This extension header is included in the RDS message + * chasing an RDMA operation. + */ +#define RDS_EXTHDR_RDMA 2 +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. + */ +#define RDS_EXTHDR_RDMA_DEST 3 +struct rds_ext_header_rdma_dest { + __be32 h_rdma_rkey; + __be32 h_rdma_offset; +}; + +#define __RDS_EXTHDR_MAX 16 /* for now */ + +struct rds_incoming { + atomic_t i_refcount; + struct list_head i_item; + struct rds_connection *i_conn; + struct rds_header i_hdr; + unsigned long i_rx_jiffies; + __be32 i_saddr; + + rds_rdma_cookie_t i_rdma_cookie; +}; + +/* + * 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_HAS_ACK_SEQ 3 +#define RDS_MSG_ACK_REQUIRED 4 +#define RDS_MSG_RETRANSMITTED 5 +#define RDS_MSG_MAPPED 6 +#define RDS_MSG_PAGEVEC 7 + +struct rds_message { + atomic_t m_refcount; + struct list_head m_sock_item; + struct list_head m_conn_item; + struct rds_incoming m_inc; + u64 m_ack_seq; + __be32 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; + struct rds_sock *m_rs; + struct rds_rdma_op *m_rdma_op; + rds_rdma_cookie_t m_rdma_cookie; + struct rds_mr *m_rdma_mr; + unsigned int m_nents; + unsigned int m_count; + struct scatterlist m_sg[0]; +}; + +/* + * 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; +}; + +/** + * 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. + * + * @xmit_cong_map: This asks the transport to send the local bitmap down the + * given connection. XXX get a better story about the bitmap + * flag and header. + */ + +struct rds_transport { + char t_name[TRANSNAMSIZ]; + struct list_head t_item; + struct module *t_owner; + unsigned int t_prefer_loopback:1; + + int (*laddr_check)(__be32 addr); + int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); + void (*conn_free)(void *data); + int (*conn_connect)(struct rds_connection *conn); + void (*conn_shutdown)(struct rds_connection *conn); + void (*xmit_prepare)(struct rds_connection *conn); + void (*xmit_complete)(struct rds_connection *conn); + int (*xmit)(struct rds_connection *conn, struct rds_message *rm, + unsigned int hdr_off, unsigned int sg, unsigned int off); + int (*xmit_cong_map)(struct rds_connection *conn, + struct rds_cong_map *map, unsigned long offset); + int (*xmit_rdma)(struct rds_connection *conn, struct rds_rdma_op *op); + int (*recv)(struct rds_connection *conn); + int (*inc_copy_to_user)(struct rds_incoming *inc, struct iovec *iov, + size_t size); + void (*inc_purge)(struct rds_incoming *inc); + void (*inc_free)(struct rds_incoming *inc); + + int (*cm_handle_connect)(struct rdma_cm_id *cm_id, + struct rdma_cm_event *event); + int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); + 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); + void (*sync_mr)(void *trans_private, int direction); + void (*free_mr)(void *trans_private, int invalidate); + void (*flush_mrs)(void); +}; + +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 rb_node rs_bound_node; + __be32 rs_bound_addr; + __be32 rs_conn_addr; + __be16 rs_bound_port; + __be16 rs_conn_port; + + /* + * This is only used to communicate the transport between bind and + * initiating connections. All other trans use is referenced through + * the connection. + */ + 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; + + /* 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, + rs_cong_monitor; +}; + +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_sem_contention; + uint64_t s_send_sem_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; +}; + +/* 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->sk_sleep; + + if (!sock_flag(sk, SOCK_DEAD) && waitq) + wake_up(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(__be32 addr, __be16 port); + +/* 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); + +/* conn.c */ +int __init rds_conn_init(void); +void rds_conn_exit(void); +struct rds_connection *rds_conn_create(__be32 laddr, __be32 faddr, + struct rds_transport *trans, gfp_t gfp); +struct rds_connection *rds_conn_create_outgoing(__be32 laddr, __be32 faddr, + struct rds_transport *trans, gfp_t gfp); +void rds_conn_destroy(struct rds_connection *conn); +void rds_conn_reset(struct rds_connection *conn); +void rds_conn_drop(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 *), + size_t item_len); +void __rds_conn_error(struct rds_connection *conn, const char *, ...) + __attribute__ ((format (printf, 2, 3))); +#define rds_conn_error(conn, fmt...) \ + __rds_conn_error(conn, KERN_WARNING "RDS: " fmt) + +static inline int +rds_conn_transition(struct rds_connection *conn, int old, int new) +{ + return atomic_cmpxchg(&conn->c_state, old, new) == old; +} + +static inline int +rds_conn_state(struct rds_connection *conn) +{ + return atomic_read(&conn->c_state); +} + +static inline int +rds_conn_up(struct rds_connection *conn) +{ + return atomic_read(&conn->c_state) == RDS_CONN_UP; +} + +static inline int +rds_conn_connecting(struct rds_connection *conn) +{ + return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING; +} + +/* message.c */ +struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); +struct rds_message *rds_message_copy_from_user(struct iovec *first_iov, + size_t total_len); +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_version_extension(struct rds_header *hdr, unsigned int version); +int rds_message_get_version_extension(struct rds_header *hdr, unsigned int *version); +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 iovec *first_iov, size_t size); +void rds_message_inc_purge(struct rds_incoming *inc); +void rds_message_inc_free(struct rds_incoming *inc); +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); + +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); +int rds_page_copy_user(struct page *page, unsigned long offset, + void __user *ptr, unsigned long bytes, + int to_user); +#define rds_page_copy_to_user(page, offset, ptr, bytes) \ + rds_page_copy_user(page, offset, ptr, bytes, 1) +#define rds_page_copy_from_user(page, offset, ptr, bytes) \ + rds_page_copy_user(page, offset, ptr, bytes, 0) +void rds_page_exit(void); + +/* recv.c */ +void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, + __be32 saddr); +void rds_inc_addref(struct rds_incoming *inc); +void rds_inc_put(struct rds_incoming *inc); +void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, + struct rds_incoming *inc, gfp_t gfp, enum km_type km); +int rds_recvmsg(struct kiocb *iocb, 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); + +/* send.c */ +int rds_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, + size_t payload_len); +void rds_send_reset(struct rds_connection *conn); +int rds_send_xmit(struct rds_connection *conn); +struct sockaddr_in; +void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *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); +int rds_send_acked_before(struct rds_connection *conn, u64 seq); +void rds_send_remove_from_sock(struct list_head *messages, int status); +int rds_send_pong(struct rds_connection *conn, __be16 dport); +struct rds_message *rds_send_get_message(struct rds_connection *, + struct rds_rdma_op *); + +/* rdma.c */ +void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); + +/* stats.c */ +DECLARE_PER_CPU(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 __init rds_stats_init(void); +void rds_stats_exit(void); +void rds_stats_info_copy(struct rds_info_iterator *iter, + uint64_t *values, char **names, size_t nr); + +/* sysctl.c */ +int __init 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 __init rds_threads_init(void); +void rds_threads_exit(void); +extern struct workqueue_struct *rds_wq; +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_complete(struct rds_connection *conn); + +/* transport.c */ +int rds_trans_register(struct rds_transport *trans); +void rds_trans_unregister(struct rds_transport *trans); +struct rds_transport *rds_trans_get_preferred(__be32 addr); +unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, + unsigned int avail); +int __init rds_trans_init(void); +void rds_trans_exit(void); + +#endif |