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RDS: Extract rds_conn_path from i_conn_path in rds_send_drop_to() for MP-capable...
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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>
7b565434 10#include <linux/rhashtable.h>
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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
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32#ifdef ATOMIC64_INIT
33#define KERNEL_HAS_ATOMIC64
34#endif
35
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36#ifdef DEBUG
37#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
38#else
39/* sigh, pr_debug() causes unused variable warnings */
b9075fa9
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40static inline __printf(1, 2)
41void rdsdebug(char *fmt, ...)
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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)
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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
57struct 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 */
72enum {
73 RDS_CONN_DOWN = 0,
74 RDS_CONN_CONNECTING,
75 RDS_CONN_DISCONNECTING,
76 RDS_CONN_UP,
9c79440e 77 RDS_CONN_RESETTING,
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78 RDS_CONN_ERROR,
79};
80
81/* Bits for c_flags */
82#define RDS_LL_SEND_FULL 0
83#define RDS_RECONNECT_PENDING 1
0f4b1c7e 84#define RDS_IN_XMIT 2
73ce4317 85#define RDS_RECV_REFILL 3
39de8281 86
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87/* Max number of multipaths per RDS connection. Must be a power of 2 */
88#define RDS_MPATH_WORKERS 1
89
90/* Per mpath connection state */
91struct rds_conn_path {
92 struct rds_connection *cp_conn;
93 struct rds_message *cp_xmit_rm;
94 unsigned long cp_xmit_sg;
95 unsigned int cp_xmit_hdr_off;
96 unsigned int cp_xmit_data_off;
97 unsigned int cp_xmit_atomic_sent;
98 unsigned int cp_xmit_rdma_sent;
99 unsigned int cp_xmit_data_sent;
100
101 spinlock_t cp_lock; /* protect msg queues */
102 u64 cp_next_tx_seq;
103 struct list_head cp_send_queue;
104 struct list_head cp_retrans;
105
106 u64 cp_next_rx_seq;
107
108 void *cp_transport_data;
109
110 atomic_t cp_state;
111 unsigned long cp_send_gen;
112 unsigned long cp_flags;
113 unsigned long cp_reconnect_jiffies;
114 struct delayed_work cp_send_w;
115 struct delayed_work cp_recv_w;
116 struct delayed_work cp_conn_w;
117 struct work_struct cp_down_w;
118 struct mutex cp_cm_lock; /* protect cp_state & cm */
119 wait_queue_head_t cp_waitq;
120
121 unsigned int cp_unacked_packets;
122 unsigned int cp_unacked_bytes;
123 unsigned int cp_outgoing:1,
124 cp_pad_to_32:31;
125 unsigned int cp_index;
126};
127
128/* One rds_connection per RDS address pair */
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129struct rds_connection {
130 struct hlist_node c_hash_node;
131 __be32 c_laddr;
132 __be32 c_faddr;
3b20fc38 133 unsigned int c_loopback:1,
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134 c_pad_to_32:31;
135 int c_npaths;
39de8281 136 struct rds_connection *c_passive;
0cb43965 137 struct rds_transport *c_trans;
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138
139 struct rds_cong_map *c_lcong;
140 struct rds_cong_map *c_fcong;
141
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142 /* Protocol version */
143 unsigned int c_version;
144 possible_net_t c_net;
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145
146 struct list_head c_map_item;
147 unsigned long c_map_queued;
39de8281 148
0cb43965 149 struct rds_conn_path c_path[RDS_MPATH_WORKERS];
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150};
151
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152static inline
153struct net *rds_conn_net(struct rds_connection *conn)
154{
155 return read_pnet(&conn->c_net);
156}
157
158static inline
159void rds_conn_net_set(struct rds_connection *conn, struct net *net)
160{
161 write_pnet(&conn->c_net, net);
162}
163
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164#define RDS_FLAG_CONG_BITMAP 0x01
165#define RDS_FLAG_ACK_REQUIRED 0x02
166#define RDS_FLAG_RETRANSMITTED 0x04
7b70d033 167#define RDS_MAX_ADV_CREDIT 255
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168
169/*
170 * Maximum space available for extension headers.
171 */
172#define RDS_HEADER_EXT_SPACE 16
173
174struct rds_header {
175 __be64 h_sequence;
176 __be64 h_ack;
177 __be32 h_len;
178 __be16 h_sport;
179 __be16 h_dport;
180 u8 h_flags;
181 u8 h_credit;
182 u8 h_padding[4];
183 __sum16 h_csum;
184
185 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
186};
187
188/*
189 * Reserved - indicates end of extensions
190 */
191#define RDS_EXTHDR_NONE 0
192
193/*
194 * This extension header is included in the very
195 * first message that is sent on a new connection,
196 * and identifies the protocol level. This will help
197 * rolling updates if a future change requires breaking
198 * the protocol.
199 * NB: This is no longer true for IB, where we do a version
200 * negotiation during the connection setup phase (protocol
201 * version information is included in the RDMA CM private data).
202 */
203#define RDS_EXTHDR_VERSION 1
204struct rds_ext_header_version {
205 __be32 h_version;
206};
207
208/*
209 * This extension header is included in the RDS message
210 * chasing an RDMA operation.
211 */
212#define RDS_EXTHDR_RDMA 2
213struct rds_ext_header_rdma {
214 __be32 h_rdma_rkey;
215};
216
217/*
218 * This extension header tells the peer about the
219 * destination <R_Key,offset> of the requested RDMA
220 * operation.
221 */
222#define RDS_EXTHDR_RDMA_DEST 3
223struct rds_ext_header_rdma_dest {
224 __be32 h_rdma_rkey;
225 __be32 h_rdma_offset;
226};
227
228#define __RDS_EXTHDR_MAX 16 /* for now */
229
230struct rds_incoming {
231 atomic_t i_refcount;
232 struct list_head i_item;
233 struct rds_connection *i_conn;
ef9e62c2 234 struct rds_conn_path *i_conn_path;
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235 struct rds_header i_hdr;
236 unsigned long i_rx_jiffies;
237 __be32 i_saddr;
238
239 rds_rdma_cookie_t i_rdma_cookie;
5711f8b3 240 struct timeval i_rx_tstamp;
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241};
242
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243struct rds_mr {
244 struct rb_node r_rb_node;
245 atomic_t r_refcount;
246 u32 r_key;
247
248 /* A copy of the creation flags */
249 unsigned int r_use_once:1;
250 unsigned int r_invalidate:1;
251 unsigned int r_write:1;
252
253 /* This is for RDS_MR_DEAD.
254 * It would be nice & consistent to make this part of the above
255 * bit field here, but we need to use test_and_set_bit.
256 */
257 unsigned long r_state;
258 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
259 struct rds_transport *r_trans;
260 void *r_trans_private;
261};
262
263/* Flags for mr->r_state */
264#define RDS_MR_DEAD 0
265
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266static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
267{
268 return r_key | (((u64) offset) << 32);
269}
270
271static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
272{
273 return cookie;
274}
275
276static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
277{
278 return cookie >> 32;
279}
280
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281/* atomic operation types */
282#define RDS_ATOMIC_TYPE_CSWP 0
283#define RDS_ATOMIC_TYPE_FADD 1
284
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285/*
286 * m_sock_item and m_conn_item are on lists that are serialized under
287 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
288 * the message will not be put back on the retransmit list after being sent.
289 * messages that are canceled while being sent rely on this.
290 *
291 * m_inc is used by loopback so that it can pass an incoming message straight
292 * back up into the rx path. It embeds a wire header which is also used by
293 * the send path, which is kind of awkward.
294 *
295 * m_sock_item indicates the message's presence on a socket's send or receive
296 * queue. m_rs will point to that socket.
297 *
298 * m_daddr is used by cancellation to prune messages to a given destination.
299 *
300 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
301 * nesting. As paths iterate over messages on a sock, or conn, they must
302 * also lock the conn, or sock, to remove the message from those lists too.
303 * Testing the flag to determine if the message is still on the lists lets
304 * us avoid testing the list_head directly. That means each path can use
305 * the message's list_head to keep it on a local list while juggling locks
306 * without confusing the other path.
307 *
308 * m_ack_seq is an optional field set by transports who need a different
309 * sequence number range to invalidate. They can use this in a callback
310 * that they pass to rds_send_drop_acked() to see if each message has been
311 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
312 * had ack_seq set yet.
313 */
314#define RDS_MSG_ON_SOCK 1
315#define RDS_MSG_ON_CONN 2
316#define RDS_MSG_HAS_ACK_SEQ 3
317#define RDS_MSG_ACK_REQUIRED 4
318#define RDS_MSG_RETRANSMITTED 5
319#define RDS_MSG_MAPPED 6
320#define RDS_MSG_PAGEVEC 7
321
322struct rds_message {
323 atomic_t m_refcount;
324 struct list_head m_sock_item;
325 struct list_head m_conn_item;
326 struct rds_incoming m_inc;
327 u64 m_ack_seq;
328 __be32 m_daddr;
329 unsigned long m_flags;
330
331 /* Never access m_rs without holding m_rs_lock.
332 * Lock nesting is
333 * rm->m_rs_lock
334 * -> rs->rs_lock
335 */
336 spinlock_t m_rs_lock;
c83188dc
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337 wait_queue_head_t m_flush_wait;
338
39de8281 339 struct rds_sock *m_rs;
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340
341 /* cookie to send to remote, in rds header */
39de8281 342 rds_rdma_cookie_t m_rdma_cookie;
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343
344 unsigned int m_used_sgs;
345 unsigned int m_total_sgs;
346
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347 void *m_final_op;
348
e779137a 349 struct {
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350 struct rm_atomic_op {
351 int op_type;
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352 union {
353 struct {
354 uint64_t compare;
355 uint64_t swap;
356 uint64_t compare_mask;
357 uint64_t swap_mask;
358 } op_m_cswp;
359 struct {
360 uint64_t add;
361 uint64_t nocarry_mask;
362 } op_m_fadd;
363 };
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364
365 u32 op_rkey;
366 u64 op_remote_addr;
367 unsigned int op_notify:1;
368 unsigned int op_recverr:1;
369 unsigned int op_mapped:1;
2c3a5f9a 370 unsigned int op_silent:1;
15133f6e 371 unsigned int op_active:1;
15133f6e 372 struct scatterlist *op_sg;
f8b3aaf2 373 struct rds_notifier *op_notifier;
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374
375 struct rds_mr *op_rdma_mr;
376 } atomic;
377 struct rm_rdma_op {
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378 u32 op_rkey;
379 u64 op_remote_addr;
380 unsigned int op_write:1;
381 unsigned int op_fence:1;
382 unsigned int op_notify:1;
383 unsigned int op_recverr:1;
384 unsigned int op_mapped:1;
2c3a5f9a 385 unsigned int op_silent:1;
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386 unsigned int op_active:1;
387 unsigned int op_bytes;
388 unsigned int op_nents;
389 unsigned int op_count;
390 struct scatterlist *op_sg;
391 struct rds_notifier *op_notifier;
392
393 struct rds_mr *op_rdma_mr;
e779137a 394 } rdma;
15133f6e 395 struct rm_data_op {
241eef3e 396 unsigned int op_active:1;
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397 unsigned int op_nents;
398 unsigned int op_count;
d655a9fb
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399 unsigned int op_dmasg;
400 unsigned int op_dmaoff;
6c7cc6e4 401 struct scatterlist *op_sg;
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402 } data;
403 };
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404};
405
406/*
407 * The RDS notifier is used (optionally) to tell the application about
408 * completed RDMA operations. Rather than keeping the whole rds message
409 * around on the queue, we allocate a small notifier that is put on the
410 * socket's notifier_list. Notifications are delivered to the application
411 * through control messages.
412 */
413struct rds_notifier {
414 struct list_head n_list;
415 uint64_t n_user_token;
416 int n_status;
417};
418
419/**
420 * struct rds_transport - transport specific behavioural hooks
421 *
422 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
423 * part of a message. The caller serializes on the send_sem so this
424 * doesn't need to be reentrant for a given conn. The header must be
425 * sent before the data payload. .xmit must be prepared to send a
426 * message with no data payload. .xmit should return the number of
427 * bytes that were sent down the connection, including header bytes.
428 * Returning 0 tells the caller that it doesn't need to perform any
429 * additional work now. This is usually the case when the transport has
430 * filled the sending queue for its connection and will handle
431 * triggering the rds thread to continue the send when space becomes
432 * available. Returning -EAGAIN tells the caller to retry the send
433 * immediately. Returning -ENOMEM tells the caller to retry the send at
434 * some point in the future.
435 *
436 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
437 * it returns the connection can not call rds_recv_incoming().
438 * This will only be called once after conn_connect returns
439 * non-zero success and will The caller serializes this with
440 * the send and connecting paths (xmit_* and conn_*). The
441 * transport is responsible for other serialization, including
442 * rds_recv_incoming(). This is called in process context but
443 * should try hard not to block.
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444 */
445
446struct rds_transport {
447 char t_name[TRANSNAMSIZ];
448 struct list_head t_item;
449 struct module *t_owner;
7e8f4413
SV
450 unsigned int t_prefer_loopback:1,
451 t_mp_capable:1;
335776bd 452 unsigned int t_type;
39de8281 453
d5a8ac28 454 int (*laddr_check)(struct net *net, __be32 addr);
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455 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
456 void (*conn_free)(void *data);
457 int (*conn_connect)(struct rds_connection *conn);
458 void (*conn_shutdown)(struct rds_connection *conn);
459 void (*xmit_prepare)(struct rds_connection *conn);
1f9ecd7e 460 void (*xmit_path_prepare)(struct rds_conn_path *cp);
39de8281 461 void (*xmit_complete)(struct rds_connection *conn);
1f9ecd7e 462 void (*xmit_path_complete)(struct rds_conn_path *cp);
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463 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
464 unsigned int hdr_off, unsigned int sg, unsigned int off);
f8b3aaf2 465 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
ff3d7d36 466 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
39de8281 467 int (*recv)(struct rds_connection *conn);
c310e72c 468 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
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469 void (*inc_free)(struct rds_incoming *inc);
470
471 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
472 struct rdma_cm_event *event);
473 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
474 void (*cm_connect_complete)(struct rds_connection *conn,
475 struct rdma_cm_event *event);
476
477 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
478 unsigned int avail);
479 void (*exit)(void);
480 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
481 struct rds_sock *rs, u32 *key_ret);
482 void (*sync_mr)(void *trans_private, int direction);
483 void (*free_mr)(void *trans_private, int invalidate);
484 void (*flush_mrs)(void);
485};
486
487struct rds_sock {
488 struct sock rs_sk;
489
490 u64 rs_user_addr;
491 u64 rs_user_bytes;
492
493 /*
494 * bound_addr used for both incoming and outgoing, no INADDR_ANY
495 * support.
496 */
7b565434 497 struct rhash_head rs_bound_node;
498 u64 rs_bound_key;
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499 __be32 rs_bound_addr;
500 __be32 rs_conn_addr;
501 __be16 rs_bound_port;
502 __be16 rs_conn_port;
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503 struct rds_transport *rs_transport;
504
505 /*
506 * rds_sendmsg caches the conn it used the last time around.
507 * This helps avoid costly lookups.
508 */
509 struct rds_connection *rs_conn;
510
511 /* flag indicating we were congested or not */
512 int rs_congested;
b98ba52f
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513 /* seen congestion (ENOBUFS) when sending? */
514 int rs_seen_congestion;
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515
516 /* rs_lock protects all these adjacent members before the newline */
517 spinlock_t rs_lock;
518 struct list_head rs_send_queue;
519 u32 rs_snd_bytes;
520 int rs_rcv_bytes;
521 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
522
523 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
524 * to decide whether the application should be woken up.
525 * If not set, we use rs_cong_track to find out whether a cong map
526 * update arrived.
527 */
528 uint64_t rs_cong_mask;
529 uint64_t rs_cong_notify;
530 struct list_head rs_cong_list;
531 unsigned long rs_cong_track;
532
533 /*
534 * rs_recv_lock protects the receive queue, and is
535 * used to serialize with rds_release.
536 */
537 rwlock_t rs_recv_lock;
538 struct list_head rs_recv_queue;
539
540 /* just for stats reporting */
541 struct list_head rs_item;
542
543 /* these have their own lock */
544 spinlock_t rs_rdma_lock;
545 struct rb_root rs_rdma_keys;
546
547 /* Socket options - in case there will be more */
548 unsigned char rs_recverr,
549 rs_cong_monitor;
550};
551
552static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
553{
554 return container_of(sk, struct rds_sock, rs_sk);
555}
556static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
557{
558 return &rs->rs_sk;
559}
560
561/*
562 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
563 * to account for overhead. We don't account for overhead, we just apply
564 * the number of payload bytes to the specified value.
565 */
566static inline int rds_sk_sndbuf(struct rds_sock *rs)
567{
568 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
569}
570static inline int rds_sk_rcvbuf(struct rds_sock *rs)
571{
572 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
573}
574
575struct rds_statistics {
576 uint64_t s_conn_reset;
577 uint64_t s_recv_drop_bad_checksum;
578 uint64_t s_recv_drop_old_seq;
579 uint64_t s_recv_drop_no_sock;
580 uint64_t s_recv_drop_dead_sock;
581 uint64_t s_recv_deliver_raced;
582 uint64_t s_recv_delivered;
583 uint64_t s_recv_queued;
584 uint64_t s_recv_immediate_retry;
585 uint64_t s_recv_delayed_retry;
586 uint64_t s_recv_ack_required;
587 uint64_t s_recv_rdma_bytes;
588 uint64_t s_recv_ping;
589 uint64_t s_send_queue_empty;
590 uint64_t s_send_queue_full;
049ee3f5
AG
591 uint64_t s_send_lock_contention;
592 uint64_t s_send_lock_queue_raced;
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593 uint64_t s_send_immediate_retry;
594 uint64_t s_send_delayed_retry;
595 uint64_t s_send_drop_acked;
596 uint64_t s_send_ack_required;
597 uint64_t s_send_queued;
598 uint64_t s_send_rdma;
599 uint64_t s_send_rdma_bytes;
600 uint64_t s_send_pong;
601 uint64_t s_page_remainder_hit;
602 uint64_t s_page_remainder_miss;
603 uint64_t s_copy_to_user;
604 uint64_t s_copy_from_user;
605 uint64_t s_cong_update_queued;
606 uint64_t s_cong_update_received;
607 uint64_t s_cong_send_error;
608 uint64_t s_cong_send_blocked;
609};
610
611/* af_rds.c */
612void rds_sock_addref(struct rds_sock *rs);
613void rds_sock_put(struct rds_sock *rs);
614void rds_wake_sk_sleep(struct rds_sock *rs);
615static inline void __rds_wake_sk_sleep(struct sock *sk)
616{
aa395145 617 wait_queue_head_t *waitq = sk_sleep(sk);
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618
619 if (!sock_flag(sk, SOCK_DEAD) && waitq)
620 wake_up(waitq);
621}
622extern wait_queue_head_t rds_poll_waitq;
623
624
625/* bind.c */
626int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
627void rds_remove_bound(struct rds_sock *rs);
628struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
7b565434 629int rds_bind_lock_init(void);
630void rds_bind_lock_destroy(void);
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AG
631
632/* cong.c */
633int rds_cong_get_maps(struct rds_connection *conn);
634void rds_cong_add_conn(struct rds_connection *conn);
635void rds_cong_remove_conn(struct rds_connection *conn);
636void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
637void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
638int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
639void rds_cong_queue_updates(struct rds_cong_map *map);
640void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
641int rds_cong_updated_since(unsigned long *recent);
642void rds_cong_add_socket(struct rds_sock *);
643void rds_cong_remove_socket(struct rds_sock *);
644void rds_cong_exit(void);
645struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
646
647/* conn.c */
ef87b7ea 648int rds_conn_init(void);
39de8281 649void rds_conn_exit(void);
d5a8ac28
SV
650struct rds_connection *rds_conn_create(struct net *net,
651 __be32 laddr, __be32 faddr,
39de8281 652 struct rds_transport *trans, gfp_t gfp);
d5a8ac28
SV
653struct rds_connection *rds_conn_create_outgoing(struct net *net,
654 __be32 laddr, __be32 faddr,
39de8281 655 struct rds_transport *trans, gfp_t gfp);
2dc39357 656void rds_conn_shutdown(struct rds_connection *conn);
39de8281 657void rds_conn_destroy(struct rds_connection *conn);
39de8281 658void rds_conn_drop(struct rds_connection *conn);
0cb43965 659void rds_conn_path_drop(struct rds_conn_path *cpath);
f3c6808d 660void rds_conn_connect_if_down(struct rds_connection *conn);
39de8281
AG
661void rds_for_each_conn_info(struct socket *sock, unsigned int len,
662 struct rds_info_iterator *iter,
663 struct rds_info_lengths *lens,
664 int (*visitor)(struct rds_connection *, void *),
665 size_t item_len);
b9075fa9
JP
666__printf(2, 3)
667void __rds_conn_error(struct rds_connection *conn, const char *, ...);
39de8281
AG
668#define rds_conn_error(conn, fmt...) \
669 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
670
0cb43965
SV
671static inline int
672rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
673{
674 return atomic_cmpxchg(&cp->cp_state, old, new) == old;
675}
676
39de8281
AG
677static inline int
678rds_conn_transition(struct rds_connection *conn, int old, int new)
679{
7e8f4413 680 WARN_ON(conn->c_trans->t_mp_capable);
0cb43965
SV
681 return rds_conn_path_transition(&conn->c_path[0], old, new);
682}
683
684static inline int
685rds_conn_path_state(struct rds_conn_path *cp)
686{
687 return atomic_read(&cp->cp_state);
39de8281
AG
688}
689
690static inline int
691rds_conn_state(struct rds_connection *conn)
692{
7e8f4413 693 WARN_ON(conn->c_trans->t_mp_capable);
0cb43965
SV
694 return rds_conn_path_state(&conn->c_path[0]);
695}
696
697static inline int
698rds_conn_path_up(struct rds_conn_path *cp)
699{
700 return atomic_read(&cp->cp_state) == RDS_CONN_UP;
39de8281
AG
701}
702
703static inline int
704rds_conn_up(struct rds_connection *conn)
705{
7e8f4413 706 WARN_ON(conn->c_trans->t_mp_capable);
0cb43965
SV
707 return rds_conn_path_up(&conn->c_path[0]);
708}
709
710static inline int
711rds_conn_path_connecting(struct rds_conn_path *cp)
712{
713 return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
39de8281
AG
714}
715
716static inline int
717rds_conn_connecting(struct rds_connection *conn)
718{
7e8f4413 719 WARN_ON(conn->c_trans->t_mp_capable);
0cb43965 720 return rds_conn_path_connecting(&conn->c_path[0]);
39de8281
AG
721}
722
723/* message.c */
724struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
fc445084 725struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
083735f4 726int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
39de8281
AG
727struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
728void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
729 __be16 dport, u64 seq);
730int rds_message_add_extension(struct rds_header *hdr,
731 unsigned int type, const void *data, unsigned int len);
732int rds_message_next_extension(struct rds_header *hdr,
733 unsigned int *pos, void *buf, unsigned int *buflen);
39de8281 734int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
c310e72c 735int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
39de8281
AG
736void rds_message_inc_free(struct rds_incoming *inc);
737void rds_message_addref(struct rds_message *rm);
738void rds_message_put(struct rds_message *rm);
739void rds_message_wait(struct rds_message *rm);
740void rds_message_unmapped(struct rds_message *rm);
741
742static inline void rds_message_make_checksum(struct rds_header *hdr)
743{
744 hdr->h_csum = 0;
745 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
746}
747
748static inline int rds_message_verify_checksum(const struct rds_header *hdr)
749{
750 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
751}
752
753
754/* page.c */
755int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
756 gfp_t gfp);
757int rds_page_copy_user(struct page *page, unsigned long offset,
758 void __user *ptr, unsigned long bytes,
759 int to_user);
760#define rds_page_copy_to_user(page, offset, ptr, bytes) \
761 rds_page_copy_user(page, offset, ptr, bytes, 1)
762#define rds_page_copy_from_user(page, offset, ptr, bytes) \
763 rds_page_copy_user(page, offset, ptr, bytes, 0)
764void rds_page_exit(void);
765
766/* recv.c */
767void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
768 __be32 saddr);
5e833e02
SV
769void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
770 __be32 saddr);
39de8281
AG
771void rds_inc_put(struct rds_incoming *inc);
772void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
6114eab5 773 struct rds_incoming *inc, gfp_t gfp);
1b784140
YX
774int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
775 int msg_flags);
39de8281
AG
776void rds_clear_recv_queue(struct rds_sock *rs);
777int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
778void rds_inc_info_copy(struct rds_incoming *inc,
779 struct rds_info_iterator *iter,
780 __be32 saddr, __be32 daddr, int flip);
781
782/* send.c */
1b784140 783int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
39de8281 784void rds_send_reset(struct rds_connection *conn);
1f9ecd7e 785int rds_send_xmit(struct rds_conn_path *cp);
39de8281
AG
786struct sockaddr_in;
787void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
788typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
789void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
790 is_acked_func is_acked);
5c3d274c
SV
791void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
792 is_acked_func is_acked);
39de8281 793int rds_send_pong(struct rds_connection *conn, __be16 dport);
39de8281
AG
794
795/* rdma.c */
796void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
21f79afa
AG
797int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
798int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
799int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
800void rds_rdma_drop_keys(struct rds_sock *rs);
801int rds_rdma_extra_size(struct rds_rdma_args *args);
802int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
803 struct cmsghdr *cmsg);
804int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
805 struct cmsghdr *cmsg);
806int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
807 struct cmsghdr *cmsg);
808int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
809 struct cmsghdr *cmsg);
f8b3aaf2 810void rds_rdma_free_op(struct rm_rdma_op *ro);
d0ab25a8 811void rds_atomic_free_op(struct rm_atomic_op *ao);
15133f6e
AG
812void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
813void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
814int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
815 struct cmsghdr *cmsg);
21f79afa 816
c1b1203d 817void __rds_put_mr_final(struct rds_mr *mr);
21f79afa
AG
818static inline void rds_mr_put(struct rds_mr *mr)
819{
820 if (atomic_dec_and_test(&mr->r_refcount))
821 __rds_put_mr_final(mr);
822}
39de8281
AG
823
824/* stats.c */
9b8de747 825DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
39de8281
AG
826#define rds_stats_inc_which(which, member) do { \
827 per_cpu(which, get_cpu()).member++; \
828 put_cpu(); \
829} while (0)
830#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
831#define rds_stats_add_which(which, member, count) do { \
832 per_cpu(which, get_cpu()).member += count; \
833 put_cpu(); \
834} while (0)
835#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
ef87b7ea 836int rds_stats_init(void);
39de8281
AG
837void rds_stats_exit(void);
838void rds_stats_info_copy(struct rds_info_iterator *iter,
36cbd3dc
JE
839 uint64_t *values, const char *const *names,
840 size_t nr);
39de8281
AG
841
842/* sysctl.c */
ef87b7ea 843int rds_sysctl_init(void);
39de8281
AG
844void rds_sysctl_exit(void);
845extern unsigned long rds_sysctl_sndbuf_min;
846extern unsigned long rds_sysctl_sndbuf_default;
847extern unsigned long rds_sysctl_sndbuf_max;
848extern unsigned long rds_sysctl_reconnect_min_jiffies;
849extern unsigned long rds_sysctl_reconnect_max_jiffies;
850extern unsigned int rds_sysctl_max_unacked_packets;
851extern unsigned int rds_sysctl_max_unacked_bytes;
852extern unsigned int rds_sysctl_ping_enable;
853extern unsigned long rds_sysctl_trace_flags;
854extern unsigned int rds_sysctl_trace_level;
855
856/* threads.c */
ef87b7ea 857int rds_threads_init(void);
39de8281
AG
858void rds_threads_exit(void);
859extern struct workqueue_struct *rds_wq;
0cb43965 860void rds_queue_reconnect(struct rds_conn_path *cp);
39de8281
AG
861void rds_connect_worker(struct work_struct *);
862void rds_shutdown_worker(struct work_struct *);
863void rds_send_worker(struct work_struct *);
864void rds_recv_worker(struct work_struct *);
0cb43965 865void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
39de8281
AG
866void rds_connect_complete(struct rds_connection *conn);
867
868/* transport.c */
869int rds_trans_register(struct rds_transport *trans);
870void rds_trans_unregister(struct rds_transport *trans);
d5a8ac28 871struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
5adb5bc6 872void rds_trans_put(struct rds_transport *trans);
39de8281
AG
873unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
874 unsigned int avail);
d97dac54 875struct rds_transport *rds_trans_get(int t_type);
ef87b7ea 876int rds_trans_init(void);
39de8281
AG
877void rds_trans_exit(void);
878
879#endif