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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 #include <linux/rhashtable.h>
 11 
 12 #include "info.h"
 13 
 14 /*
 15  * RDS Network protocol version
 16  */
 17 #define RDS_PROTOCOL_3_0        0x0300
 18 #define RDS_PROTOCOL_3_1        0x0301
 19 #define RDS_PROTOCOL_VERSION    RDS_PROTOCOL_3_1
 20 #define RDS_PROTOCOL_MAJOR(v)   ((v) >> 8)
 21 #define RDS_PROTOCOL_MINOR(v)   ((v) & 255)
 22 #define RDS_PROTOCOL(maj, min)  (((maj) << 8) | min)
 23 
 24 /*
 25  * XXX randomly chosen, but at least seems to be unused:
 26  * #               18464-18768 Unassigned
 27  * We should do better.  We want a reserved port to discourage unpriv'ed
 28  * userspace from listening.
 29  */
 30 #define RDS_PORT        18634
 31 
 32 #ifdef ATOMIC64_INIT
 33 #define KERNEL_HAS_ATOMIC64
 34 #endif
 35 
 36 #ifdef DEBUG
 37 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
 38 #else
 39 /* sigh, pr_debug() causes unused variable warnings */
 40 static inline __printf(1, 2)
 41 void rdsdebug(char *fmt, ...)
 42 {
 43 }
 44 #endif
 45 
 46 /* XXX is there one of these somewhere? */
 47 #define ceil(x, y) \
 48         ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
 49 
 50 #define RDS_FRAG_SHIFT  12
 51 #define RDS_FRAG_SIZE   ((unsigned int)(1 << RDS_FRAG_SHIFT))
 52 
 53 #define RDS_CONG_MAP_BYTES      (65536 / 8)
 54 #define RDS_CONG_MAP_PAGES      (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
 55 #define RDS_CONG_MAP_PAGE_BITS  (PAGE_SIZE * 8)
 56 
 57 struct rds_cong_map {
 58         struct rb_node          m_rb_node;
 59         __be32                  m_addr;
 60         wait_queue_head_t       m_waitq;
 61         struct list_head        m_conn_list;
 62         unsigned long           m_page_addrs[RDS_CONG_MAP_PAGES];
 63 };
 64 
 65 
 66 /*
 67  * This is how we will track the connection state:
 68  * A connection is always in one of the following
 69  * states. Updates to the state are atomic and imply
 70  * a memory barrier.
 71  */
 72 enum {
 73         RDS_CONN_DOWN = 0,
 74         RDS_CONN_CONNECTING,
 75         RDS_CONN_DISCONNECTING,
 76         RDS_CONN_UP,
 77         RDS_CONN_RESETTING,
 78         RDS_CONN_ERROR,
 79 };
 80 
 81 /* Bits for c_flags */
 82 #define RDS_LL_SEND_FULL        0
 83 #define RDS_RECONNECT_PENDING   1
 84 #define RDS_IN_XMIT             2
 85 #define RDS_RECV_REFILL         3
 86 
 87 /* Max number of multipaths per RDS connection. Must be a power of 2 */
 88 #define RDS_MPATH_WORKERS       8
 89 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
 90                                (rs)->rs_hash_initval) & ((n) - 1))
 91 
 92 /* Per mpath connection state */
 93 struct rds_conn_path {
 94         struct rds_connection   *cp_conn;
 95         struct rds_message      *cp_xmit_rm;
 96         unsigned long           cp_xmit_sg;
 97         unsigned int            cp_xmit_hdr_off;
 98         unsigned int            cp_xmit_data_off;
 99         unsigned int            cp_xmit_atomic_sent;
100         unsigned int            cp_xmit_rdma_sent;
101         unsigned int            cp_xmit_data_sent;
102 
103         spinlock_t              cp_lock;                /* protect msg queues */
104         u64                     cp_next_tx_seq;
105         struct list_head        cp_send_queue;
106         struct list_head        cp_retrans;
107 
108         u64                     cp_next_rx_seq;
109 
110         void                    *cp_transport_data;
111 
112         atomic_t                cp_state;
113         unsigned long           cp_send_gen;
114         unsigned long           cp_flags;
115         unsigned long           cp_reconnect_jiffies;
116         struct delayed_work     cp_send_w;
117         struct delayed_work     cp_recv_w;
118         struct delayed_work     cp_conn_w;
119         struct work_struct      cp_down_w;
120         struct mutex            cp_cm_lock;     /* protect cp_state & cm */
121         wait_queue_head_t       cp_waitq;
122 
123         unsigned int            cp_unacked_packets;
124         unsigned int            cp_unacked_bytes;
125         unsigned int            cp_outgoing:1,
126                                 cp_pad_to_32:31;
127         unsigned int            cp_index;
128 };
129 
130 /* One rds_connection per RDS address pair */
131 struct rds_connection {
132         struct hlist_node       c_hash_node;
133         __be32                  c_laddr;
134         __be32                  c_faddr;
135         unsigned int            c_loopback:1,
136                                 c_ping_triggered:1,
137                                 c_pad_to_32:30;
138         int                     c_npaths;
139         struct rds_connection   *c_passive;
140         struct rds_transport    *c_trans;
141 
142         struct rds_cong_map     *c_lcong;
143         struct rds_cong_map     *c_fcong;
144 
145         /* Protocol version */
146         unsigned int            c_version;
147         possible_net_t          c_net;
148 
149         struct list_head        c_map_item;
150         unsigned long           c_map_queued;
151 
152         struct rds_conn_path    c_path[RDS_MPATH_WORKERS];
153         wait_queue_head_t       c_hs_waitq; /* handshake waitq */
154 };
155 
156 static inline
157 struct net *rds_conn_net(struct rds_connection *conn)
158 {
159         return read_pnet(&conn->c_net);
160 }
161 
162 static inline
163 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
164 {
165         write_pnet(&conn->c_net, net);
166 }
167 
168 #define RDS_FLAG_CONG_BITMAP    0x01
169 #define RDS_FLAG_ACK_REQUIRED   0x02
170 #define RDS_FLAG_RETRANSMITTED  0x04
171 #define RDS_MAX_ADV_CREDIT      255
172 
173 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
174  * probe to exchange control information before establishing a connection.
175  * Currently the control information that is exchanged is the number of
176  * supported paths. If the peer is a legacy (older kernel revision) peer,
177  * it would return a pong message without additional control information
178  * that would then alert the sender that the peer was an older rev.
179  */
180 #define RDS_FLAG_PROBE_PORT     1
181 #define RDS_HS_PROBE(sport, dport) \
182                 ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
183                  (sport == 0 && dport == RDS_FLAG_PROBE_PORT))
184 /*
185  * Maximum space available for extension headers.
186  */
187 #define RDS_HEADER_EXT_SPACE    16
188 
189 struct rds_header {
190         __be64  h_sequence;
191         __be64  h_ack;
192         __be32  h_len;
193         __be16  h_sport;
194         __be16  h_dport;
195         u8      h_flags;
196         u8      h_credit;
197         u8      h_padding[4];
198         __sum16 h_csum;
199 
200         u8      h_exthdr[RDS_HEADER_EXT_SPACE];
201 };
202 
203 /*
204  * Reserved - indicates end of extensions
205  */
206 #define RDS_EXTHDR_NONE         0
207 
208 /*
209  * This extension header is included in the very
210  * first message that is sent on a new connection,
211  * and identifies the protocol level. This will help
212  * rolling updates if a future change requires breaking
213  * the protocol.
214  * NB: This is no longer true for IB, where we do a version
215  * negotiation during the connection setup phase (protocol
216  * version information is included in the RDMA CM private data).
217  */
218 #define RDS_EXTHDR_VERSION      1
219 struct rds_ext_header_version {
220         __be32                  h_version;
221 };
222 
223 /*
224  * This extension header is included in the RDS message
225  * chasing an RDMA operation.
226  */
227 #define RDS_EXTHDR_RDMA         2
228 struct rds_ext_header_rdma {
229         __be32                  h_rdma_rkey;
230 };
231 
232 /*
233  * This extension header tells the peer about the
234  * destination <R_Key,offset> of the requested RDMA
235  * operation.
236  */
237 #define RDS_EXTHDR_RDMA_DEST    3
238 struct rds_ext_header_rdma_dest {
239         __be32                  h_rdma_rkey;
240         __be32                  h_rdma_offset;
241 };
242 
243 /* Extension header announcing number of paths.
244  * Implicit length = 2 bytes.
245  */
246 #define RDS_EXTHDR_NPATHS       4
247 
248 #define __RDS_EXTHDR_MAX        16 /* for now */
249 
250 struct rds_incoming {
251         atomic_t                i_refcount;
252         struct list_head        i_item;
253         struct rds_connection   *i_conn;
254         struct rds_conn_path    *i_conn_path;
255         struct rds_header       i_hdr;
256         unsigned long           i_rx_jiffies;
257         __be32                  i_saddr;
258 
259         rds_rdma_cookie_t       i_rdma_cookie;
260         struct timeval          i_rx_tstamp;
261 };
262 
263 struct rds_mr {
264         struct rb_node          r_rb_node;
265         atomic_t                r_refcount;
266         u32                     r_key;
267 
268         /* A copy of the creation flags */
269         unsigned int            r_use_once:1;
270         unsigned int            r_invalidate:1;
271         unsigned int            r_write:1;
272 
273         /* This is for RDS_MR_DEAD.
274          * It would be nice & consistent to make this part of the above
275          * bit field here, but we need to use test_and_set_bit.
276          */
277         unsigned long           r_state;
278         struct rds_sock         *r_sock; /* back pointer to the socket that owns us */
279         struct rds_transport    *r_trans;
280         void                    *r_trans_private;
281 };
282 
283 /* Flags for mr->r_state */
284 #define RDS_MR_DEAD             0
285 
286 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
287 {
288         return r_key | (((u64) offset) << 32);
289 }
290 
291 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
292 {
293         return cookie;
294 }
295 
296 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
297 {
298         return cookie >> 32;
299 }
300 
301 /* atomic operation types */
302 #define RDS_ATOMIC_TYPE_CSWP            0
303 #define RDS_ATOMIC_TYPE_FADD            1
304 
305 /*
306  * m_sock_item and m_conn_item are on lists that are serialized under
307  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
308  * the message will not be put back on the retransmit list after being sent.
309  * messages that are canceled while being sent rely on this.
310  *
311  * m_inc is used by loopback so that it can pass an incoming message straight
312  * back up into the rx path.  It embeds a wire header which is also used by
313  * the send path, which is kind of awkward.
314  *
315  * m_sock_item indicates the message's presence on a socket's send or receive
316  * queue.  m_rs will point to that socket.
317  *
318  * m_daddr is used by cancellation to prune messages to a given destination.
319  *
320  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
321  * nesting.  As paths iterate over messages on a sock, or conn, they must
322  * also lock the conn, or sock, to remove the message from those lists too.
323  * Testing the flag to determine if the message is still on the lists lets
324  * us avoid testing the list_head directly.  That means each path can use
325  * the message's list_head to keep it on a local list while juggling locks
326  * without confusing the other path.
327  *
328  * m_ack_seq is an optional field set by transports who need a different
329  * sequence number range to invalidate.  They can use this in a callback
330  * that they pass to rds_send_drop_acked() to see if each message has been
331  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
332  * had ack_seq set yet.
333  */
334 #define RDS_MSG_ON_SOCK         1
335 #define RDS_MSG_ON_CONN         2
336 #define RDS_MSG_HAS_ACK_SEQ     3
337 #define RDS_MSG_ACK_REQUIRED    4
338 #define RDS_MSG_RETRANSMITTED   5
339 #define RDS_MSG_MAPPED          6
340 #define RDS_MSG_PAGEVEC         7
341 
342 struct rds_message {
343         atomic_t                m_refcount;
344         struct list_head        m_sock_item;
345         struct list_head        m_conn_item;
346         struct rds_incoming     m_inc;
347         u64                     m_ack_seq;
348         __be32                  m_daddr;
349         unsigned long           m_flags;
350 
351         /* Never access m_rs without holding m_rs_lock.
352          * Lock nesting is
353          *  rm->m_rs_lock
354          *   -> rs->rs_lock
355          */
356         spinlock_t              m_rs_lock;
357         wait_queue_head_t       m_flush_wait;
358 
359         struct rds_sock         *m_rs;
360 
361         /* cookie to send to remote, in rds header */
362         rds_rdma_cookie_t       m_rdma_cookie;
363 
364         unsigned int            m_used_sgs;
365         unsigned int            m_total_sgs;
366 
367         void                    *m_final_op;
368 
369         struct {
370                 struct rm_atomic_op {
371                         int                     op_type;
372                         union {
373                                 struct {
374                                         uint64_t        compare;
375                                         uint64_t        swap;
376                                         uint64_t        compare_mask;
377                                         uint64_t        swap_mask;
378                                 } op_m_cswp;
379                                 struct {
380                                         uint64_t        add;
381                                         uint64_t        nocarry_mask;
382                                 } op_m_fadd;
383                         };
384 
385                         u32                     op_rkey;
386                         u64                     op_remote_addr;
387                         unsigned int            op_notify:1;
388                         unsigned int            op_recverr:1;
389                         unsigned int            op_mapped:1;
390                         unsigned int            op_silent:1;
391                         unsigned int            op_active:1;
392                         struct scatterlist      *op_sg;
393                         struct rds_notifier     *op_notifier;
394 
395                         struct rds_mr           *op_rdma_mr;
396                 } atomic;
397                 struct rm_rdma_op {
398                         u32                     op_rkey;
399                         u64                     op_remote_addr;
400                         unsigned int            op_write:1;
401                         unsigned int            op_fence:1;
402                         unsigned int            op_notify:1;
403                         unsigned int            op_recverr:1;
404                         unsigned int            op_mapped:1;
405                         unsigned int            op_silent:1;
406                         unsigned int            op_active:1;
407                         unsigned int            op_bytes;
408                         unsigned int            op_nents;
409                         unsigned int            op_count;
410                         struct scatterlist      *op_sg;
411                         struct rds_notifier     *op_notifier;
412 
413                         struct rds_mr           *op_rdma_mr;
414                 } rdma;
415                 struct rm_data_op {
416                         unsigned int            op_active:1;
417                         unsigned int            op_nents;
418                         unsigned int            op_count;
419                         unsigned int            op_dmasg;
420                         unsigned int            op_dmaoff;
421                         struct scatterlist      *op_sg;
422                 } data;
423         };
424 };
425 
426 /*
427  * The RDS notifier is used (optionally) to tell the application about
428  * completed RDMA operations. Rather than keeping the whole rds message
429  * around on the queue, we allocate a small notifier that is put on the
430  * socket's notifier_list. Notifications are delivered to the application
431  * through control messages.
432  */
433 struct rds_notifier {
434         struct list_head        n_list;
435         uint64_t                n_user_token;
436         int                     n_status;
437 };
438 
439 /**
440  * struct rds_transport -  transport specific behavioural hooks
441  *
442  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
443  *        part of a message.  The caller serializes on the send_sem so this
444  *        doesn't need to be reentrant for a given conn.  The header must be
445  *        sent before the data payload.  .xmit must be prepared to send a
446  *        message with no data payload.  .xmit should return the number of
447  *        bytes that were sent down the connection, including header bytes.
448  *        Returning 0 tells the caller that it doesn't need to perform any
449  *        additional work now.  This is usually the case when the transport has
450  *        filled the sending queue for its connection and will handle
451  *        triggering the rds thread to continue the send when space becomes
452  *        available.  Returning -EAGAIN tells the caller to retry the send
453  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
454  *        some point in the future.
455  *
456  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
457  *                 it returns the connection can not call rds_recv_incoming().
458  *                 This will only be called once after conn_connect returns
459  *                 non-zero success and will The caller serializes this with
460  *                 the send and connecting paths (xmit_* and conn_*).  The
461  *                 transport is responsible for other serialization, including
462  *                 rds_recv_incoming().  This is called in process context but
463  *                 should try hard not to block.
464  */
465 
466 struct rds_transport {
467         char                    t_name[TRANSNAMSIZ];
468         struct list_head        t_item;
469         struct module           *t_owner;
470         unsigned int            t_prefer_loopback:1,
471                                 t_mp_capable:1;
472         unsigned int            t_type;
473 
474         int (*laddr_check)(struct net *net, __be32 addr);
475         int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
476         void (*conn_free)(void *data);
477         int (*conn_path_connect)(struct rds_conn_path *cp);
478         void (*conn_path_shutdown)(struct rds_conn_path *conn);
479         void (*xmit_path_prepare)(struct rds_conn_path *cp);
480         void (*xmit_path_complete)(struct rds_conn_path *cp);
481         int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
482                     unsigned int hdr_off, unsigned int sg, unsigned int off);
483         int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
484         int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
485         int (*recv_path)(struct rds_conn_path *cp);
486         int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
487         void (*inc_free)(struct rds_incoming *inc);
488 
489         int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
490                                  struct rdma_cm_event *event);
491         int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
492         void (*cm_connect_complete)(struct rds_connection *conn,
493                                     struct rdma_cm_event *event);
494 
495         unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
496                                         unsigned int avail);
497         void (*exit)(void);
498         void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
499                         struct rds_sock *rs, u32 *key_ret);
500         void (*sync_mr)(void *trans_private, int direction);
501         void (*free_mr)(void *trans_private, int invalidate);
502         void (*flush_mrs)(void);
503 };
504 
505 struct rds_sock {
506         struct sock             rs_sk;
507 
508         u64                     rs_user_addr;
509         u64                     rs_user_bytes;
510 
511         /*
512          * bound_addr used for both incoming and outgoing, no INADDR_ANY
513          * support.
514          */
515         struct rhash_head       rs_bound_node;
516         u64                     rs_bound_key;
517         __be32                  rs_bound_addr;
518         __be32                  rs_conn_addr;
519         __be16                  rs_bound_port;
520         __be16                  rs_conn_port;
521         struct rds_transport    *rs_transport;
522 
523         /*
524          * rds_sendmsg caches the conn it used the last time around.
525          * This helps avoid costly lookups.
526          */
527         struct rds_connection   *rs_conn;
528 
529         /* flag indicating we were congested or not */
530         int                     rs_congested;
531         /* seen congestion (ENOBUFS) when sending? */
532         int                     rs_seen_congestion;
533 
534         /* rs_lock protects all these adjacent members before the newline */
535         spinlock_t              rs_lock;
536         struct list_head        rs_send_queue;
537         u32                     rs_snd_bytes;
538         int                     rs_rcv_bytes;
539         struct list_head        rs_notify_queue;        /* currently used for failed RDMAs */
540 
541         /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
542          * to decide whether the application should be woken up.
543          * If not set, we use rs_cong_track to find out whether a cong map
544          * update arrived.
545          */
546         uint64_t                rs_cong_mask;
547         uint64_t                rs_cong_notify;
548         struct list_head        rs_cong_list;
549         unsigned long           rs_cong_track;
550 
551         /*
552          * rs_recv_lock protects the receive queue, and is
553          * used to serialize with rds_release.
554          */
555         rwlock_t                rs_recv_lock;
556         struct list_head        rs_recv_queue;
557 
558         /* just for stats reporting */
559         struct list_head        rs_item;
560 
561         /* these have their own lock */
562         spinlock_t              rs_rdma_lock;
563         struct rb_root          rs_rdma_keys;
564 
565         /* Socket options - in case there will be more */
566         unsigned char           rs_recverr,
567                                 rs_cong_monitor;
568         u32                     rs_hash_initval;
569 };
570 
571 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
572 {
573         return container_of(sk, struct rds_sock, rs_sk);
574 }
575 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
576 {
577         return &rs->rs_sk;
578 }
579 
580 /*
581  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
582  * to account for overhead.  We don't account for overhead, we just apply
583  * the number of payload bytes to the specified value.
584  */
585 static inline int rds_sk_sndbuf(struct rds_sock *rs)
586 {
587         return rds_rs_to_sk(rs)->sk_sndbuf / 2;
588 }
589 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
590 {
591         return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
592 }
593 
594 struct rds_statistics {
595         uint64_t        s_conn_reset;
596         uint64_t        s_recv_drop_bad_checksum;
597         uint64_t        s_recv_drop_old_seq;
598         uint64_t        s_recv_drop_no_sock;
599         uint64_t        s_recv_drop_dead_sock;
600         uint64_t        s_recv_deliver_raced;
601         uint64_t        s_recv_delivered;
602         uint64_t        s_recv_queued;
603         uint64_t        s_recv_immediate_retry;
604         uint64_t        s_recv_delayed_retry;
605         uint64_t        s_recv_ack_required;
606         uint64_t        s_recv_rdma_bytes;
607         uint64_t        s_recv_ping;
608         uint64_t        s_send_queue_empty;
609         uint64_t        s_send_queue_full;
610         uint64_t        s_send_lock_contention;
611         uint64_t        s_send_lock_queue_raced;
612         uint64_t        s_send_immediate_retry;
613         uint64_t        s_send_delayed_retry;
614         uint64_t        s_send_drop_acked;
615         uint64_t        s_send_ack_required;
616         uint64_t        s_send_queued;
617         uint64_t        s_send_rdma;
618         uint64_t        s_send_rdma_bytes;
619         uint64_t        s_send_pong;
620         uint64_t        s_page_remainder_hit;
621         uint64_t        s_page_remainder_miss;
622         uint64_t        s_copy_to_user;
623         uint64_t        s_copy_from_user;
624         uint64_t        s_cong_update_queued;
625         uint64_t        s_cong_update_received;
626         uint64_t        s_cong_send_error;
627         uint64_t        s_cong_send_blocked;
628 };
629 
630 /* af_rds.c */
631 void rds_sock_addref(struct rds_sock *rs);
632 void rds_sock_put(struct rds_sock *rs);
633 void rds_wake_sk_sleep(struct rds_sock *rs);
634 static inline void __rds_wake_sk_sleep(struct sock *sk)
635 {
636         wait_queue_head_t *waitq = sk_sleep(sk);
637 
638         if (!sock_flag(sk, SOCK_DEAD) && waitq)
639                 wake_up(waitq);
640 }
641 extern wait_queue_head_t rds_poll_waitq;
642 
643 
644 /* bind.c */
645 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
646 void rds_remove_bound(struct rds_sock *rs);
647 struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
648 int rds_bind_lock_init(void);
649 void rds_bind_lock_destroy(void);
650 
651 /* cong.c */
652 int rds_cong_get_maps(struct rds_connection *conn);
653 void rds_cong_add_conn(struct rds_connection *conn);
654 void rds_cong_remove_conn(struct rds_connection *conn);
655 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
656 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
657 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
658 void rds_cong_queue_updates(struct rds_cong_map *map);
659 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
660 int rds_cong_updated_since(unsigned long *recent);
661 void rds_cong_add_socket(struct rds_sock *);
662 void rds_cong_remove_socket(struct rds_sock *);
663 void rds_cong_exit(void);
664 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
665 
666 /* conn.c */
667 int rds_conn_init(void);
668 void rds_conn_exit(void);
669 struct rds_connection *rds_conn_create(struct net *net,
670                                        __be32 laddr, __be32 faddr,
671                                        struct rds_transport *trans, gfp_t gfp);
672 struct rds_connection *rds_conn_create_outgoing(struct net *net,
673                                                 __be32 laddr, __be32 faddr,
674                                struct rds_transport *trans, gfp_t gfp);
675 void rds_conn_shutdown(struct rds_conn_path *cpath);
676 void rds_conn_destroy(struct rds_connection *conn);
677 void rds_conn_drop(struct rds_connection *conn);
678 void rds_conn_path_drop(struct rds_conn_path *cpath);
679 void rds_conn_connect_if_down(struct rds_connection *conn);
680 void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
681 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
682                           struct rds_info_iterator *iter,
683                           struct rds_info_lengths *lens,
684                           int (*visitor)(struct rds_connection *, void *),
685                           size_t item_len);
686 __printf(2, 3)
687 void __rds_conn_error(struct rds_connection *conn, const char *, ...);
688 #define rds_conn_error(conn, fmt...) \
689         __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
690 
691 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...);
692 #define rds_conn_path_error(cp, fmt...) \
693         __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
694 
695 static inline int
696 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
697 {
698         return atomic_cmpxchg(&cp->cp_state, old, new) == old;
699 }
700 
701 static inline int
702 rds_conn_transition(struct rds_connection *conn, int old, int new)
703 {
704         WARN_ON(conn->c_trans->t_mp_capable);
705         return rds_conn_path_transition(&conn->c_path[0], old, new);
706 }
707 
708 static inline int
709 rds_conn_path_state(struct rds_conn_path *cp)
710 {
711         return atomic_read(&cp->cp_state);
712 }
713 
714 static inline int
715 rds_conn_state(struct rds_connection *conn)
716 {
717         WARN_ON(conn->c_trans->t_mp_capable);
718         return rds_conn_path_state(&conn->c_path[0]);
719 }
720 
721 static inline int
722 rds_conn_path_up(struct rds_conn_path *cp)
723 {
724         return atomic_read(&cp->cp_state) == RDS_CONN_UP;
725 }
726 
727 static inline int
728 rds_conn_up(struct rds_connection *conn)
729 {
730         WARN_ON(conn->c_trans->t_mp_capable);
731         return rds_conn_path_up(&conn->c_path[0]);
732 }
733 
734 static inline int
735 rds_conn_path_connecting(struct rds_conn_path *cp)
736 {
737         return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
738 }
739 
740 static inline int
741 rds_conn_connecting(struct rds_connection *conn)
742 {
743         WARN_ON(conn->c_trans->t_mp_capable);
744         return rds_conn_path_connecting(&conn->c_path[0]);
745 }
746 
747 /* message.c */
748 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
749 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
750 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
751 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
752 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
753                                  __be16 dport, u64 seq);
754 int rds_message_add_extension(struct rds_header *hdr,
755                               unsigned int type, const void *data, unsigned int len);
756 int rds_message_next_extension(struct rds_header *hdr,
757                                unsigned int *pos, void *buf, unsigned int *buflen);
758 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
759 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
760 void rds_message_inc_free(struct rds_incoming *inc);
761 void rds_message_addref(struct rds_message *rm);
762 void rds_message_put(struct rds_message *rm);
763 void rds_message_wait(struct rds_message *rm);
764 void rds_message_unmapped(struct rds_message *rm);
765 
766 static inline void rds_message_make_checksum(struct rds_header *hdr)
767 {
768         hdr->h_csum = 0;
769         hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
770 }
771 
772 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
773 {
774         return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
775 }
776 
777 
778 /* page.c */
779 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
780                              gfp_t gfp);
781 int rds_page_copy_user(struct page *page, unsigned long offset,
782                        void __user *ptr, unsigned long bytes,
783                        int to_user);
784 #define rds_page_copy_to_user(page, offset, ptr, bytes) \
785         rds_page_copy_user(page, offset, ptr, bytes, 1)
786 #define rds_page_copy_from_user(page, offset, ptr, bytes) \
787         rds_page_copy_user(page, offset, ptr, bytes, 0)
788 void rds_page_exit(void);
789 
790 /* recv.c */
791 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
792                   __be32 saddr);
793 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
794                        __be32 saddr);
795 void rds_inc_put(struct rds_incoming *inc);
796 void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
797                        struct rds_incoming *inc, gfp_t gfp);
798 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
799                 int msg_flags);
800 void rds_clear_recv_queue(struct rds_sock *rs);
801 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
802 void rds_inc_info_copy(struct rds_incoming *inc,
803                        struct rds_info_iterator *iter,
804                        __be32 saddr, __be32 daddr, int flip);
805 
806 /* send.c */
807 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
808 void rds_send_path_reset(struct rds_conn_path *conn);
809 int rds_send_xmit(struct rds_conn_path *cp);
810 struct sockaddr_in;
811 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
812 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
813 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
814                          is_acked_func is_acked);
815 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
816                               is_acked_func is_acked);
817 int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
818 
819 /* rdma.c */
820 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
821 int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
822 int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
823 int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
824 void rds_rdma_drop_keys(struct rds_sock *rs);
825 int rds_rdma_extra_size(struct rds_rdma_args *args);
826 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
827                           struct cmsghdr *cmsg);
828 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
829                           struct cmsghdr *cmsg);
830 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
831                           struct cmsghdr *cmsg);
832 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
833                           struct cmsghdr *cmsg);
834 void rds_rdma_free_op(struct rm_rdma_op *ro);
835 void rds_atomic_free_op(struct rm_atomic_op *ao);
836 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
837 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
838 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
839                     struct cmsghdr *cmsg);
840 
841 void __rds_put_mr_final(struct rds_mr *mr);
842 static inline void rds_mr_put(struct rds_mr *mr)
843 {
844         if (atomic_dec_and_test(&mr->r_refcount))
845                 __rds_put_mr_final(mr);
846 }
847 
848 /* stats.c */
849 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
850 #define rds_stats_inc_which(which, member) do {         \
851         per_cpu(which, get_cpu()).member++;             \
852         put_cpu();                                      \
853 } while (0)
854 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
855 #define rds_stats_add_which(which, member, count) do {          \
856         per_cpu(which, get_cpu()).member += count;      \
857         put_cpu();                                      \
858 } while (0)
859 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
860 int rds_stats_init(void);
861 void rds_stats_exit(void);
862 void rds_stats_info_copy(struct rds_info_iterator *iter,
863                          uint64_t *values, const char *const *names,
864                          size_t nr);
865 
866 /* sysctl.c */
867 int rds_sysctl_init(void);
868 void rds_sysctl_exit(void);
869 extern unsigned long rds_sysctl_sndbuf_min;
870 extern unsigned long rds_sysctl_sndbuf_default;
871 extern unsigned long rds_sysctl_sndbuf_max;
872 extern unsigned long rds_sysctl_reconnect_min_jiffies;
873 extern unsigned long rds_sysctl_reconnect_max_jiffies;
874 extern unsigned int  rds_sysctl_max_unacked_packets;
875 extern unsigned int  rds_sysctl_max_unacked_bytes;
876 extern unsigned int  rds_sysctl_ping_enable;
877 extern unsigned long rds_sysctl_trace_flags;
878 extern unsigned int  rds_sysctl_trace_level;
879 
880 /* threads.c */
881 int rds_threads_init(void);
882 void rds_threads_exit(void);
883 extern struct workqueue_struct *rds_wq;
884 void rds_queue_reconnect(struct rds_conn_path *cp);
885 void rds_connect_worker(struct work_struct *);
886 void rds_shutdown_worker(struct work_struct *);
887 void rds_send_worker(struct work_struct *);
888 void rds_recv_worker(struct work_struct *);
889 void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
890 void rds_connect_complete(struct rds_connection *conn);
891 
892 /* transport.c */
893 int rds_trans_register(struct rds_transport *trans);
894 void rds_trans_unregister(struct rds_transport *trans);
895 struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
896 void rds_trans_put(struct rds_transport *trans);
897 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
898                                        unsigned int avail);
899 struct rds_transport *rds_trans_get(int t_type);
900 int rds_trans_init(void);
901 void rds_trans_exit(void);
902 
903 #endif
904 

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