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TOMOYO Linux Cross Reference
Linux/net/rds/rds.h

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  1 #ifndef _RDS_RDS_H
  2 #define _RDS_RDS_H
  3 
  4 #include <net/sock.h>
  5 #include <linux/scatterlist.h>
  6 #include <linux/highmem.h>
  7 #include <rdma/rdma_cm.h>
  8 #include <linux/mutex.h>
  9 #include <linux/rds.h>
 10 
 11 #include "info.h"
 12 
 13 /*
 14  * RDS Network protocol version
 15  */
 16 #define RDS_PROTOCOL_3_0        0x0300
 17 #define RDS_PROTOCOL_3_1        0x0301
 18 #define RDS_PROTOCOL_VERSION    RDS_PROTOCOL_3_1
 19 #define RDS_PROTOCOL_MAJOR(v)   ((v) >> 8)
 20 #define RDS_PROTOCOL_MINOR(v)   ((v) & 255)
 21 #define RDS_PROTOCOL(maj, min)  (((maj) << 8) | min)
 22 
 23 /*
 24  * XXX randomly chosen, but at least seems to be unused:
 25  * #               18464-18768 Unassigned
 26  * We should do better.  We want a reserved port to discourage unpriv'ed
 27  * userspace from listening.
 28  */
 29 #define RDS_PORT        18634
 30 
 31 #ifdef ATOMIC64_INIT
 32 #define KERNEL_HAS_ATOMIC64
 33 #endif
 34 
 35 #ifdef DEBUG
 36 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
 37 #else
 38 /* sigh, pr_debug() causes unused variable warnings */
 39 static inline __printf(1, 2)
 40 void rdsdebug(char *fmt, ...)
 41 {
 42 }
 43 #endif
 44 
 45 /* XXX is there one of these somewhere? */
 46 #define ceil(x, y) \
 47         ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
 48 
 49 #define RDS_FRAG_SHIFT  12
 50 #define RDS_FRAG_SIZE   ((unsigned int)(1 << RDS_FRAG_SHIFT))
 51 
 52 #define RDS_CONG_MAP_BYTES      (65536 / 8)
 53 #define RDS_CONG_MAP_PAGES      (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
 54 #define RDS_CONG_MAP_PAGE_BITS  (PAGE_SIZE * 8)
 55 
 56 struct rds_cong_map {
 57         struct rb_node          m_rb_node;
 58         __be32                  m_addr;
 59         wait_queue_head_t       m_waitq;
 60         struct list_head        m_conn_list;
 61         unsigned long           m_page_addrs[RDS_CONG_MAP_PAGES];
 62 };
 63 
 64 
 65 /*
 66  * This is how we will track the connection state:
 67  * A connection is always in one of the following
 68  * states. Updates to the state are atomic and imply
 69  * a memory barrier.
 70  */
 71 enum {
 72         RDS_CONN_DOWN = 0,
 73         RDS_CONN_CONNECTING,
 74         RDS_CONN_DISCONNECTING,
 75         RDS_CONN_UP,
 76         RDS_CONN_ERROR,
 77 };
 78 
 79 /* Bits for c_flags */
 80 #define RDS_LL_SEND_FULL        0
 81 #define RDS_RECONNECT_PENDING   1
 82 #define RDS_IN_XMIT             2
 83 #define RDS_RECV_REFILL         3
 84 
 85 struct rds_connection {
 86         struct hlist_node       c_hash_node;
 87         __be32                  c_laddr;
 88         __be32                  c_faddr;
 89         unsigned int            c_loopback:1;
 90         struct rds_connection   *c_passive;
 91 
 92         struct rds_cong_map     *c_lcong;
 93         struct rds_cong_map     *c_fcong;
 94 
 95         struct rds_message      *c_xmit_rm;
 96         unsigned long           c_xmit_sg;
 97         unsigned int            c_xmit_hdr_off;
 98         unsigned int            c_xmit_data_off;
 99         unsigned int            c_xmit_atomic_sent;
100         unsigned int            c_xmit_rdma_sent;
101         unsigned int            c_xmit_data_sent;
102 
103         spinlock_t              c_lock;         /* protect msg queues */
104         u64                     c_next_tx_seq;
105         struct list_head        c_send_queue;
106         struct list_head        c_retrans;
107 
108         u64                     c_next_rx_seq;
109 
110         struct rds_transport    *c_trans;
111         void                    *c_transport_data;
112 
113         atomic_t                c_state;
114         unsigned long           c_send_gen;
115         unsigned long           c_flags;
116         unsigned long           c_reconnect_jiffies;
117         struct delayed_work     c_send_w;
118         struct delayed_work     c_recv_w;
119         struct delayed_work     c_conn_w;
120         struct work_struct      c_down_w;
121         struct mutex            c_cm_lock;      /* protect conn state & cm */
122         wait_queue_head_t       c_waitq;
123 
124         struct list_head        c_map_item;
125         unsigned long           c_map_queued;
126 
127         unsigned int            c_unacked_packets;
128         unsigned int            c_unacked_bytes;
129 
130         /* Protocol version */
131         unsigned int            c_version;
132         possible_net_t          c_net;
133 };
134 
135 static inline
136 struct net *rds_conn_net(struct rds_connection *conn)
137 {
138         return read_pnet(&conn->c_net);
139 }
140 
141 static inline
142 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
143 {
144         write_pnet(&conn->c_net, net);
145 }
146 
147 #define RDS_FLAG_CONG_BITMAP    0x01
148 #define RDS_FLAG_ACK_REQUIRED   0x02
149 #define RDS_FLAG_RETRANSMITTED  0x04
150 #define RDS_MAX_ADV_CREDIT      255
151 
152 /*
153  * Maximum space available for extension headers.
154  */
155 #define RDS_HEADER_EXT_SPACE    16
156 
157 struct rds_header {
158         __be64  h_sequence;
159         __be64  h_ack;
160         __be32  h_len;
161         __be16  h_sport;
162         __be16  h_dport;
163         u8      h_flags;
164         u8      h_credit;
165         u8      h_padding[4];
166         __sum16 h_csum;
167 
168         u8      h_exthdr[RDS_HEADER_EXT_SPACE];
169 };
170 
171 /*
172  * Reserved - indicates end of extensions
173  */
174 #define RDS_EXTHDR_NONE         0
175 
176 /*
177  * This extension header is included in the very
178  * first message that is sent on a new connection,
179  * and identifies the protocol level. This will help
180  * rolling updates if a future change requires breaking
181  * the protocol.
182  * NB: This is no longer true for IB, where we do a version
183  * negotiation during the connection setup phase (protocol
184  * version information is included in the RDMA CM private data).
185  */
186 #define RDS_EXTHDR_VERSION      1
187 struct rds_ext_header_version {
188         __be32                  h_version;
189 };
190 
191 /*
192  * This extension header is included in the RDS message
193  * chasing an RDMA operation.
194  */
195 #define RDS_EXTHDR_RDMA         2
196 struct rds_ext_header_rdma {
197         __be32                  h_rdma_rkey;
198 };
199 
200 /*
201  * This extension header tells the peer about the
202  * destination <R_Key,offset> of the requested RDMA
203  * operation.
204  */
205 #define RDS_EXTHDR_RDMA_DEST    3
206 struct rds_ext_header_rdma_dest {
207         __be32                  h_rdma_rkey;
208         __be32                  h_rdma_offset;
209 };
210 
211 #define __RDS_EXTHDR_MAX        16 /* for now */
212 
213 struct rds_incoming {
214         atomic_t                i_refcount;
215         struct list_head        i_item;
216         struct rds_connection   *i_conn;
217         struct rds_header       i_hdr;
218         unsigned long           i_rx_jiffies;
219         __be32                  i_saddr;
220 
221         rds_rdma_cookie_t       i_rdma_cookie;
222 };
223 
224 struct rds_mr {
225         struct rb_node          r_rb_node;
226         atomic_t                r_refcount;
227         u32                     r_key;
228 
229         /* A copy of the creation flags */
230         unsigned int            r_use_once:1;
231         unsigned int            r_invalidate:1;
232         unsigned int            r_write:1;
233 
234         /* This is for RDS_MR_DEAD.
235          * It would be nice & consistent to make this part of the above
236          * bit field here, but we need to use test_and_set_bit.
237          */
238         unsigned long           r_state;
239         struct rds_sock         *r_sock; /* back pointer to the socket that owns us */
240         struct rds_transport    *r_trans;
241         void                    *r_trans_private;
242 };
243 
244 /* Flags for mr->r_state */
245 #define RDS_MR_DEAD             0
246 
247 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
248 {
249         return r_key | (((u64) offset) << 32);
250 }
251 
252 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
253 {
254         return cookie;
255 }
256 
257 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
258 {
259         return cookie >> 32;
260 }
261 
262 /* atomic operation types */
263 #define RDS_ATOMIC_TYPE_CSWP            0
264 #define RDS_ATOMIC_TYPE_FADD            1
265 
266 /*
267  * m_sock_item and m_conn_item are on lists that are serialized under
268  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
269  * the message will not be put back on the retransmit list after being sent.
270  * messages that are canceled while being sent rely on this.
271  *
272  * m_inc is used by loopback so that it can pass an incoming message straight
273  * back up into the rx path.  It embeds a wire header which is also used by
274  * the send path, which is kind of awkward.
275  *
276  * m_sock_item indicates the message's presence on a socket's send or receive
277  * queue.  m_rs will point to that socket.
278  *
279  * m_daddr is used by cancellation to prune messages to a given destination.
280  *
281  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
282  * nesting.  As paths iterate over messages on a sock, or conn, they must
283  * also lock the conn, or sock, to remove the message from those lists too.
284  * Testing the flag to determine if the message is still on the lists lets
285  * us avoid testing the list_head directly.  That means each path can use
286  * the message's list_head to keep it on a local list while juggling locks
287  * without confusing the other path.
288  *
289  * m_ack_seq is an optional field set by transports who need a different
290  * sequence number range to invalidate.  They can use this in a callback
291  * that they pass to rds_send_drop_acked() to see if each message has been
292  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
293  * had ack_seq set yet.
294  */
295 #define RDS_MSG_ON_SOCK         1
296 #define RDS_MSG_ON_CONN         2
297 #define RDS_MSG_HAS_ACK_SEQ     3
298 #define RDS_MSG_ACK_REQUIRED    4
299 #define RDS_MSG_RETRANSMITTED   5
300 #define RDS_MSG_MAPPED          6
301 #define RDS_MSG_PAGEVEC         7
302 
303 struct rds_message {
304         atomic_t                m_refcount;
305         struct list_head        m_sock_item;
306         struct list_head        m_conn_item;
307         struct rds_incoming     m_inc;
308         u64                     m_ack_seq;
309         __be32                  m_daddr;
310         unsigned long           m_flags;
311 
312         /* Never access m_rs without holding m_rs_lock.
313          * Lock nesting is
314          *  rm->m_rs_lock
315          *   -> rs->rs_lock
316          */
317         spinlock_t              m_rs_lock;
318         wait_queue_head_t       m_flush_wait;
319 
320         struct rds_sock         *m_rs;
321 
322         /* cookie to send to remote, in rds header */
323         rds_rdma_cookie_t       m_rdma_cookie;
324 
325         unsigned int            m_used_sgs;
326         unsigned int            m_total_sgs;
327 
328         void                    *m_final_op;
329 
330         struct {
331                 struct rm_atomic_op {
332                         int                     op_type;
333                         union {
334                                 struct {
335                                         uint64_t        compare;
336                                         uint64_t        swap;
337                                         uint64_t        compare_mask;
338                                         uint64_t        swap_mask;
339                                 } op_m_cswp;
340                                 struct {
341                                         uint64_t        add;
342                                         uint64_t        nocarry_mask;
343                                 } op_m_fadd;
344                         };
345 
346                         u32                     op_rkey;
347                         u64                     op_remote_addr;
348                         unsigned int            op_notify:1;
349                         unsigned int            op_recverr:1;
350                         unsigned int            op_mapped:1;
351                         unsigned int            op_silent:1;
352                         unsigned int            op_active:1;
353                         struct scatterlist      *op_sg;
354                         struct rds_notifier     *op_notifier;
355 
356                         struct rds_mr           *op_rdma_mr;
357                 } atomic;
358                 struct rm_rdma_op {
359                         u32                     op_rkey;
360                         u64                     op_remote_addr;
361                         unsigned int            op_write:1;
362                         unsigned int            op_fence:1;
363                         unsigned int            op_notify:1;
364                         unsigned int            op_recverr:1;
365                         unsigned int            op_mapped:1;
366                         unsigned int            op_silent:1;
367                         unsigned int            op_active:1;
368                         unsigned int            op_bytes;
369                         unsigned int            op_nents;
370                         unsigned int            op_count;
371                         struct scatterlist      *op_sg;
372                         struct rds_notifier     *op_notifier;
373 
374                         struct rds_mr           *op_rdma_mr;
375                 } rdma;
376                 struct rm_data_op {
377                         unsigned int            op_active:1;
378                         unsigned int            op_nents;
379                         unsigned int            op_count;
380                         unsigned int            op_dmasg;
381                         unsigned int            op_dmaoff;
382                         struct scatterlist      *op_sg;
383                 } data;
384         };
385 };
386 
387 /*
388  * The RDS notifier is used (optionally) to tell the application about
389  * completed RDMA operations. Rather than keeping the whole rds message
390  * around on the queue, we allocate a small notifier that is put on the
391  * socket's notifier_list. Notifications are delivered to the application
392  * through control messages.
393  */
394 struct rds_notifier {
395         struct list_head        n_list;
396         uint64_t                n_user_token;
397         int                     n_status;
398 };
399 
400 /**
401  * struct rds_transport -  transport specific behavioural hooks
402  *
403  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
404  *        part of a message.  The caller serializes on the send_sem so this
405  *        doesn't need to be reentrant for a given conn.  The header must be
406  *        sent before the data payload.  .xmit must be prepared to send a
407  *        message with no data payload.  .xmit should return the number of
408  *        bytes that were sent down the connection, including header bytes.
409  *        Returning 0 tells the caller that it doesn't need to perform any
410  *        additional work now.  This is usually the case when the transport has
411  *        filled the sending queue for its connection and will handle
412  *        triggering the rds thread to continue the send when space becomes
413  *        available.  Returning -EAGAIN tells the caller to retry the send
414  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
415  *        some point in the future.
416  *
417  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
418  *                 it returns the connection can not call rds_recv_incoming().
419  *                 This will only be called once after conn_connect returns
420  *                 non-zero success and will The caller serializes this with
421  *                 the send and connecting paths (xmit_* and conn_*).  The
422  *                 transport is responsible for other serialization, including
423  *                 rds_recv_incoming().  This is called in process context but
424  *                 should try hard not to block.
425  */
426 
427 struct rds_transport {
428         char                    t_name[TRANSNAMSIZ];
429         struct list_head        t_item;
430         struct module           *t_owner;
431         unsigned int            t_prefer_loopback:1;
432         unsigned int            t_type;
433 
434         int (*laddr_check)(struct net *net, __be32 addr);
435         int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
436         void (*conn_free)(void *data);
437         int (*conn_connect)(struct rds_connection *conn);
438         void (*conn_shutdown)(struct rds_connection *conn);
439         void (*xmit_prepare)(struct rds_connection *conn);
440         void (*xmit_complete)(struct rds_connection *conn);
441         int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
442                     unsigned int hdr_off, unsigned int sg, unsigned int off);
443         int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
444         int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
445         int (*recv)(struct rds_connection *conn);
446         int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
447         void (*inc_free)(struct rds_incoming *inc);
448 
449         int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
450                                  struct rdma_cm_event *event);
451         int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
452         void (*cm_connect_complete)(struct rds_connection *conn,
453                                     struct rdma_cm_event *event);
454 
455         unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
456                                         unsigned int avail);
457         void (*exit)(void);
458         void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
459                         struct rds_sock *rs, u32 *key_ret);
460         void (*sync_mr)(void *trans_private, int direction);
461         void (*free_mr)(void *trans_private, int invalidate);
462         void (*flush_mrs)(void);
463 };
464 
465 struct rds_sock {
466         struct sock             rs_sk;
467 
468         u64                     rs_user_addr;
469         u64                     rs_user_bytes;
470 
471         /*
472          * bound_addr used for both incoming and outgoing, no INADDR_ANY
473          * support.
474          */
475         struct hlist_node       rs_bound_node;
476         __be32                  rs_bound_addr;
477         __be32                  rs_conn_addr;
478         __be16                  rs_bound_port;
479         __be16                  rs_conn_port;
480         struct rds_transport    *rs_transport;
481 
482         /*
483          * rds_sendmsg caches the conn it used the last time around.
484          * This helps avoid costly lookups.
485          */
486         struct rds_connection   *rs_conn;
487 
488         /* flag indicating we were congested or not */
489         int                     rs_congested;
490         /* seen congestion (ENOBUFS) when sending? */
491         int                     rs_seen_congestion;
492 
493         /* rs_lock protects all these adjacent members before the newline */
494         spinlock_t              rs_lock;
495         struct list_head        rs_send_queue;
496         u32                     rs_snd_bytes;
497         int                     rs_rcv_bytes;
498         struct list_head        rs_notify_queue;        /* currently used for failed RDMAs */
499 
500         /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
501          * to decide whether the application should be woken up.
502          * If not set, we use rs_cong_track to find out whether a cong map
503          * update arrived.
504          */
505         uint64_t                rs_cong_mask;
506         uint64_t                rs_cong_notify;
507         struct list_head        rs_cong_list;
508         unsigned long           rs_cong_track;
509 
510         /*
511          * rs_recv_lock protects the receive queue, and is
512          * used to serialize with rds_release.
513          */
514         rwlock_t                rs_recv_lock;
515         struct list_head        rs_recv_queue;
516 
517         /* just for stats reporting */
518         struct list_head        rs_item;
519 
520         /* these have their own lock */
521         spinlock_t              rs_rdma_lock;
522         struct rb_root          rs_rdma_keys;
523 
524         /* Socket options - in case there will be more */
525         unsigned char           rs_recverr,
526                                 rs_cong_monitor;
527 };
528 
529 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
530 {
531         return container_of(sk, struct rds_sock, rs_sk);
532 }
533 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
534 {
535         return &rs->rs_sk;
536 }
537 
538 /*
539  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
540  * to account for overhead.  We don't account for overhead, we just apply
541  * the number of payload bytes to the specified value.
542  */
543 static inline int rds_sk_sndbuf(struct rds_sock *rs)
544 {
545         return rds_rs_to_sk(rs)->sk_sndbuf / 2;
546 }
547 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
548 {
549         return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
550 }
551 
552 struct rds_statistics {
553         uint64_t        s_conn_reset;
554         uint64_t        s_recv_drop_bad_checksum;
555         uint64_t        s_recv_drop_old_seq;
556         uint64_t        s_recv_drop_no_sock;
557         uint64_t        s_recv_drop_dead_sock;
558         uint64_t        s_recv_deliver_raced;
559         uint64_t        s_recv_delivered;
560         uint64_t        s_recv_queued;
561         uint64_t        s_recv_immediate_retry;
562         uint64_t        s_recv_delayed_retry;
563         uint64_t        s_recv_ack_required;
564         uint64_t        s_recv_rdma_bytes;
565         uint64_t        s_recv_ping;
566         uint64_t        s_send_queue_empty;
567         uint64_t        s_send_queue_full;
568         uint64_t        s_send_lock_contention;
569         uint64_t        s_send_lock_queue_raced;
570         uint64_t        s_send_immediate_retry;
571         uint64_t        s_send_delayed_retry;
572         uint64_t        s_send_drop_acked;
573         uint64_t        s_send_ack_required;
574         uint64_t        s_send_queued;
575         uint64_t        s_send_rdma;
576         uint64_t        s_send_rdma_bytes;
577         uint64_t        s_send_pong;
578         uint64_t        s_page_remainder_hit;
579         uint64_t        s_page_remainder_miss;
580         uint64_t        s_copy_to_user;
581         uint64_t        s_copy_from_user;
582         uint64_t        s_cong_update_queued;
583         uint64_t        s_cong_update_received;
584         uint64_t        s_cong_send_error;
585         uint64_t        s_cong_send_blocked;
586 };
587 
588 /* af_rds.c */
589 void rds_sock_addref(struct rds_sock *rs);
590 void rds_sock_put(struct rds_sock *rs);
591 void rds_wake_sk_sleep(struct rds_sock *rs);
592 static inline void __rds_wake_sk_sleep(struct sock *sk)
593 {
594         wait_queue_head_t *waitq = sk_sleep(sk);
595 
596         if (!sock_flag(sk, SOCK_DEAD) && waitq)
597                 wake_up(waitq);
598 }
599 extern wait_queue_head_t rds_poll_waitq;
600 
601 
602 /* bind.c */
603 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
604 void rds_remove_bound(struct rds_sock *rs);
605 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
606 
607 /* cong.c */
608 int rds_cong_get_maps(struct rds_connection *conn);
609 void rds_cong_add_conn(struct rds_connection *conn);
610 void rds_cong_remove_conn(struct rds_connection *conn);
611 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
612 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
613 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
614 void rds_cong_queue_updates(struct rds_cong_map *map);
615 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
616 int rds_cong_updated_since(unsigned long *recent);
617 void rds_cong_add_socket(struct rds_sock *);
618 void rds_cong_remove_socket(struct rds_sock *);
619 void rds_cong_exit(void);
620 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
621 
622 /* conn.c */
623 int rds_conn_init(void);
624 void rds_conn_exit(void);
625 struct rds_connection *rds_conn_create(struct net *net,
626                                        __be32 laddr, __be32 faddr,
627                                        struct rds_transport *trans, gfp_t gfp);
628 struct rds_connection *rds_conn_create_outgoing(struct net *net,
629                                                 __be32 laddr, __be32 faddr,
630                                struct rds_transport *trans, gfp_t gfp);
631 void rds_conn_shutdown(struct rds_connection *conn);
632 void rds_conn_destroy(struct rds_connection *conn);
633 void rds_conn_drop(struct rds_connection *conn);
634 void rds_conn_connect_if_down(struct rds_connection *conn);
635 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
636                           struct rds_info_iterator *iter,
637                           struct rds_info_lengths *lens,
638                           int (*visitor)(struct rds_connection *, void *),
639                           size_t item_len);
640 __printf(2, 3)
641 void __rds_conn_error(struct rds_connection *conn, const char *, ...);
642 #define rds_conn_error(conn, fmt...) \
643         __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
644 
645 static inline int
646 rds_conn_transition(struct rds_connection *conn, int old, int new)
647 {
648         return atomic_cmpxchg(&conn->c_state, old, new) == old;
649 }
650 
651 static inline int
652 rds_conn_state(struct rds_connection *conn)
653 {
654         return atomic_read(&conn->c_state);
655 }
656 
657 static inline int
658 rds_conn_up(struct rds_connection *conn)
659 {
660         return atomic_read(&conn->c_state) == RDS_CONN_UP;
661 }
662 
663 static inline int
664 rds_conn_connecting(struct rds_connection *conn)
665 {
666         return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
667 }
668 
669 /* message.c */
670 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
671 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
672 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
673 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
674 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
675                                  __be16 dport, u64 seq);
676 int rds_message_add_extension(struct rds_header *hdr,
677                               unsigned int type, const void *data, unsigned int len);
678 int rds_message_next_extension(struct rds_header *hdr,
679                                unsigned int *pos, void *buf, unsigned int *buflen);
680 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
681 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
682 void rds_message_inc_free(struct rds_incoming *inc);
683 void rds_message_addref(struct rds_message *rm);
684 void rds_message_put(struct rds_message *rm);
685 void rds_message_wait(struct rds_message *rm);
686 void rds_message_unmapped(struct rds_message *rm);
687 
688 static inline void rds_message_make_checksum(struct rds_header *hdr)
689 {
690         hdr->h_csum = 0;
691         hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
692 }
693 
694 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
695 {
696         return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
697 }
698 
699 
700 /* page.c */
701 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
702                              gfp_t gfp);
703 int rds_page_copy_user(struct page *page, unsigned long offset,
704                        void __user *ptr, unsigned long bytes,
705                        int to_user);
706 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
707         rds_page_copy_user(page, offset, ptr, bytes, 1)
708 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
709         rds_page_copy_user(page, offset, ptr, bytes, 0)
710 void rds_page_exit(void);
711 
712 /* recv.c */
713 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
714                   __be32 saddr);
715 void rds_inc_put(struct rds_incoming *inc);
716 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
717                        struct rds_incoming *inc, gfp_t gfp);
718 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
719                 int msg_flags);
720 void rds_clear_recv_queue(struct rds_sock *rs);
721 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
722 void rds_inc_info_copy(struct rds_incoming *inc,
723                        struct rds_info_iterator *iter,
724                        __be32 saddr, __be32 daddr, int flip);
725 
726 /* send.c */
727 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
728 void rds_send_reset(struct rds_connection *conn);
729 int rds_send_xmit(struct rds_connection *conn);
730 struct sockaddr_in;
731 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
732 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
733 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
734                          is_acked_func is_acked);
735 int rds_send_pong(struct rds_connection *conn, __be16 dport);
736 struct rds_message *rds_send_get_message(struct rds_connection *,
737                                          struct rm_rdma_op *);
738 
739 /* rdma.c */
740 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
741 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
742 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
743 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
744 void rds_rdma_drop_keys(struct rds_sock *rs);
745 int rds_rdma_extra_size(struct rds_rdma_args *args);
746 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
747                           struct cmsghdr *cmsg);
748 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
749                           struct cmsghdr *cmsg);
750 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
751                           struct cmsghdr *cmsg);
752 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
753                           struct cmsghdr *cmsg);
754 void rds_rdma_free_op(struct rm_rdma_op *ro);
755 void rds_atomic_free_op(struct rm_atomic_op *ao);
756 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
757 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
758 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
759                     struct cmsghdr *cmsg);
760 
761 void __rds_put_mr_final(struct rds_mr *mr);
762 static inline void rds_mr_put(struct rds_mr *mr)
763 {
764         if (atomic_dec_and_test(&mr->r_refcount))
765                 __rds_put_mr_final(mr);
766 }
767 
768 /* stats.c */
769 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
770 #define rds_stats_inc_which(which, member) do {         \
771         per_cpu(which, get_cpu()).member++;             \
772         put_cpu();                                      \
773 } while (0)
774 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
775 #define rds_stats_add_which(which, member, count) do {          \
776         per_cpu(which, get_cpu()).member += count;      \
777         put_cpu();                                      \
778 } while (0)
779 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
780 int rds_stats_init(void);
781 void rds_stats_exit(void);
782 void rds_stats_info_copy(struct rds_info_iterator *iter,
783                          uint64_t *values, const char *const *names,
784                          size_t nr);
785 
786 /* sysctl.c */
787 int rds_sysctl_init(void);
788 void rds_sysctl_exit(void);
789 extern unsigned long rds_sysctl_sndbuf_min;
790 extern unsigned long rds_sysctl_sndbuf_default;
791 extern unsigned long rds_sysctl_sndbuf_max;
792 extern unsigned long rds_sysctl_reconnect_min_jiffies;
793 extern unsigned long rds_sysctl_reconnect_max_jiffies;
794 extern unsigned int  rds_sysctl_max_unacked_packets;
795 extern unsigned int  rds_sysctl_max_unacked_bytes;
796 extern unsigned int  rds_sysctl_ping_enable;
797 extern unsigned long rds_sysctl_trace_flags;
798 extern unsigned int  rds_sysctl_trace_level;
799 
800 /* threads.c */
801 int rds_threads_init(void);
802 void rds_threads_exit(void);
803 extern struct workqueue_struct *rds_wq;
804 void rds_queue_reconnect(struct rds_connection *conn);
805 void rds_connect_worker(struct work_struct *);
806 void rds_shutdown_worker(struct work_struct *);
807 void rds_send_worker(struct work_struct *);
808 void rds_recv_worker(struct work_struct *);
809 void rds_connect_complete(struct rds_connection *conn);
810 
811 /* transport.c */
812 int rds_trans_register(struct rds_transport *trans);
813 void rds_trans_unregister(struct rds_transport *trans);
814 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
815 void rds_trans_put(struct rds_transport *trans);
816 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
817                                        unsigned int avail);
818 struct rds_transport *rds_trans_get(int t_type);
819 int rds_trans_init(void);
820 void rds_trans_exit(void);
821 
822 #endif
823 

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