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Andy Grover39de8282009-02-24 15:30:19 +00001#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>
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -070010#include <linux/rhashtable.h>
Andy Grover39de8282009-02-24 15:30:19 +000011
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
Andy Grover8cbd9602009-04-01 08:20:20 +000032#ifdef ATOMIC64_INIT
33#define KERNEL_HAS_ATOMIC64
34#endif
35
Andy Grover39de8282009-02-24 15:30:19 +000036#ifdef DEBUG
37#define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
38#else
39/* sigh, pr_debug() causes unused variable warnings */
Joe Perchesb9075fa2011-10-31 17:11:33 -070040static inline __printf(1, 2)
41void rdsdebug(char *fmt, ...)
Andy Grover39de8282009-02-24 15:30:19 +000042{
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)
Andy Grover39de8282009-02-24 15:30:19 +000054#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,
77 RDS_CONN_ERROR,
78};
79
80/* Bits for c_flags */
81#define RDS_LL_SEND_FULL 0
82#define RDS_RECONNECT_PENDING 1
Zach Brown0f4b1c72010-06-04 14:41:41 -070083#define RDS_IN_XMIT 2
santosh.shilimkar@oracle.com73ce4312015-08-22 15:45:26 -070084#define RDS_RECV_REFILL 3
Andy Grover39de8282009-02-24 15:30:19 +000085
86struct rds_connection {
87 struct hlist_node c_hash_node;
88 __be32 c_laddr;
89 __be32 c_faddr;
Sowmini Varadhan3b20fc32015-09-30 16:54:07 -040090 unsigned int c_loopback:1,
91 c_outgoing:1,
92 c_pad_to_32:30;
Andy Grover39de8282009-02-24 15:30:19 +000093 struct rds_connection *c_passive;
94
95 struct rds_cong_map *c_lcong;
96 struct rds_cong_map *c_fcong;
97
Andy Grover39de8282009-02-24 15:30:19 +000098 struct rds_message *c_xmit_rm;
99 unsigned long c_xmit_sg;
100 unsigned int c_xmit_hdr_off;
101 unsigned int c_xmit_data_off;
Andy Grover15133f62010-01-12 14:33:38 -0800102 unsigned int c_xmit_atomic_sent;
Andy Grover5b2366b2010-02-03 19:36:44 -0800103 unsigned int c_xmit_rdma_sent;
104 unsigned int c_xmit_data_sent;
Andy Grover39de8282009-02-24 15:30:19 +0000105
106 spinlock_t c_lock; /* protect msg queues */
107 u64 c_next_tx_seq;
108 struct list_head c_send_queue;
109 struct list_head c_retrans;
110
111 u64 c_next_rx_seq;
112
113 struct rds_transport *c_trans;
114 void *c_transport_data;
115
116 atomic_t c_state;
Sowmini Varadhan443be0e2015-04-08 12:33:47 -0400117 unsigned long c_send_gen;
Andy Grover39de8282009-02-24 15:30:19 +0000118 unsigned long c_flags;
119 unsigned long c_reconnect_jiffies;
120 struct delayed_work c_send_w;
121 struct delayed_work c_recv_w;
122 struct delayed_work c_conn_w;
123 struct work_struct c_down_w;
124 struct mutex c_cm_lock; /* protect conn state & cm */
Zach Brown0f4b1c72010-06-04 14:41:41 -0700125 wait_queue_head_t c_waitq;
Andy Grover39de8282009-02-24 15:30:19 +0000126
127 struct list_head c_map_item;
128 unsigned long c_map_queued;
Andy Grover39de8282009-02-24 15:30:19 +0000129
130 unsigned int c_unacked_packets;
131 unsigned int c_unacked_bytes;
132
133 /* Protocol version */
134 unsigned int c_version;
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400135 possible_net_t c_net;
Andy Grover39de8282009-02-24 15:30:19 +0000136};
137
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400138static inline
139struct net *rds_conn_net(struct rds_connection *conn)
140{
141 return read_pnet(&conn->c_net);
142}
143
144static inline
145void rds_conn_net_set(struct rds_connection *conn, struct net *net)
146{
147 write_pnet(&conn->c_net, net);
148}
149
Andy Grover39de8282009-02-24 15:30:19 +0000150#define RDS_FLAG_CONG_BITMAP 0x01
151#define RDS_FLAG_ACK_REQUIRED 0x02
152#define RDS_FLAG_RETRANSMITTED 0x04
Steve Wise7b70d032009-04-09 14:09:39 +0000153#define RDS_MAX_ADV_CREDIT 255
Andy Grover39de8282009-02-24 15:30:19 +0000154
155/*
156 * Maximum space available for extension headers.
157 */
158#define RDS_HEADER_EXT_SPACE 16
159
160struct rds_header {
161 __be64 h_sequence;
162 __be64 h_ack;
163 __be32 h_len;
164 __be16 h_sport;
165 __be16 h_dport;
166 u8 h_flags;
167 u8 h_credit;
168 u8 h_padding[4];
169 __sum16 h_csum;
170
171 u8 h_exthdr[RDS_HEADER_EXT_SPACE];
172};
173
174/*
175 * Reserved - indicates end of extensions
176 */
177#define RDS_EXTHDR_NONE 0
178
179/*
180 * This extension header is included in the very
181 * first message that is sent on a new connection,
182 * and identifies the protocol level. This will help
183 * rolling updates if a future change requires breaking
184 * the protocol.
185 * NB: This is no longer true for IB, where we do a version
186 * negotiation during the connection setup phase (protocol
187 * version information is included in the RDMA CM private data).
188 */
189#define RDS_EXTHDR_VERSION 1
190struct rds_ext_header_version {
191 __be32 h_version;
192};
193
194/*
195 * This extension header is included in the RDS message
196 * chasing an RDMA operation.
197 */
198#define RDS_EXTHDR_RDMA 2
199struct rds_ext_header_rdma {
200 __be32 h_rdma_rkey;
201};
202
203/*
204 * This extension header tells the peer about the
205 * destination <R_Key,offset> of the requested RDMA
206 * operation.
207 */
208#define RDS_EXTHDR_RDMA_DEST 3
209struct rds_ext_header_rdma_dest {
210 __be32 h_rdma_rkey;
211 __be32 h_rdma_offset;
212};
213
214#define __RDS_EXTHDR_MAX 16 /* for now */
215
216struct rds_incoming {
217 atomic_t i_refcount;
218 struct list_head i_item;
219 struct rds_connection *i_conn;
220 struct rds_header i_hdr;
221 unsigned long i_rx_jiffies;
222 __be32 i_saddr;
223
224 rds_rdma_cookie_t i_rdma_cookie;
225};
226
Andy Grover21f79af2010-01-12 12:57:27 -0800227struct rds_mr {
228 struct rb_node r_rb_node;
229 atomic_t r_refcount;
230 u32 r_key;
231
232 /* A copy of the creation flags */
233 unsigned int r_use_once:1;
234 unsigned int r_invalidate:1;
235 unsigned int r_write:1;
236
237 /* This is for RDS_MR_DEAD.
238 * It would be nice & consistent to make this part of the above
239 * bit field here, but we need to use test_and_set_bit.
240 */
241 unsigned long r_state;
242 struct rds_sock *r_sock; /* back pointer to the socket that owns us */
243 struct rds_transport *r_trans;
244 void *r_trans_private;
245};
246
247/* Flags for mr->r_state */
248#define RDS_MR_DEAD 0
249
Andy Grover21f79af2010-01-12 12:57:27 -0800250static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
251{
252 return r_key | (((u64) offset) << 32);
253}
254
255static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
256{
257 return cookie;
258}
259
260static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
261{
262 return cookie >> 32;
263}
264
Andy Grover15133f62010-01-12 14:33:38 -0800265/* atomic operation types */
266#define RDS_ATOMIC_TYPE_CSWP 0
267#define RDS_ATOMIC_TYPE_FADD 1
268
Andy Grover39de8282009-02-24 15:30:19 +0000269/*
270 * m_sock_item and m_conn_item are on lists that are serialized under
271 * conn->c_lock. m_sock_item has additional meaning in that once it is empty
272 * the message will not be put back on the retransmit list after being sent.
273 * messages that are canceled while being sent rely on this.
274 *
275 * m_inc is used by loopback so that it can pass an incoming message straight
276 * back up into the rx path. It embeds a wire header which is also used by
277 * the send path, which is kind of awkward.
278 *
279 * m_sock_item indicates the message's presence on a socket's send or receive
280 * queue. m_rs will point to that socket.
281 *
282 * m_daddr is used by cancellation to prune messages to a given destination.
283 *
284 * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
285 * nesting. As paths iterate over messages on a sock, or conn, they must
286 * also lock the conn, or sock, to remove the message from those lists too.
287 * Testing the flag to determine if the message is still on the lists lets
288 * us avoid testing the list_head directly. That means each path can use
289 * the message's list_head to keep it on a local list while juggling locks
290 * without confusing the other path.
291 *
292 * m_ack_seq is an optional field set by transports who need a different
293 * sequence number range to invalidate. They can use this in a callback
294 * that they pass to rds_send_drop_acked() to see if each message has been
295 * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't
296 * had ack_seq set yet.
297 */
298#define RDS_MSG_ON_SOCK 1
299#define RDS_MSG_ON_CONN 2
300#define RDS_MSG_HAS_ACK_SEQ 3
301#define RDS_MSG_ACK_REQUIRED 4
302#define RDS_MSG_RETRANSMITTED 5
303#define RDS_MSG_MAPPED 6
304#define RDS_MSG_PAGEVEC 7
305
306struct rds_message {
307 atomic_t m_refcount;
308 struct list_head m_sock_item;
309 struct list_head m_conn_item;
310 struct rds_incoming m_inc;
311 u64 m_ack_seq;
312 __be32 m_daddr;
313 unsigned long m_flags;
314
315 /* Never access m_rs without holding m_rs_lock.
316 * Lock nesting is
317 * rm->m_rs_lock
318 * -> rs->rs_lock
319 */
320 spinlock_t m_rs_lock;
Chris Masonc83188d2010-04-21 13:09:28 -0700321 wait_queue_head_t m_flush_wait;
322
Andy Grover39de8282009-02-24 15:30:19 +0000323 struct rds_sock *m_rs;
Andy Grover7e3bd652010-03-01 16:04:59 -0800324
325 /* cookie to send to remote, in rds header */
Andy Grover39de8282009-02-24 15:30:19 +0000326 rds_rdma_cookie_t m_rdma_cookie;
Andy Grover7e3bd652010-03-01 16:04:59 -0800327
328 unsigned int m_used_sgs;
329 unsigned int m_total_sgs;
330
Andy Groverff3d7d32010-03-01 14:03:09 -0800331 void *m_final_op;
332
Andy Grovere7791372010-01-12 12:15:02 -0800333 struct {
Andy Grover15133f62010-01-12 14:33:38 -0800334 struct rm_atomic_op {
335 int op_type;
Andy Grover20c72bd2010-08-25 05:51:28 -0700336 union {
337 struct {
338 uint64_t compare;
339 uint64_t swap;
340 uint64_t compare_mask;
341 uint64_t swap_mask;
342 } op_m_cswp;
343 struct {
344 uint64_t add;
345 uint64_t nocarry_mask;
346 } op_m_fadd;
347 };
Andy Grover15133f62010-01-12 14:33:38 -0800348
349 u32 op_rkey;
350 u64 op_remote_addr;
351 unsigned int op_notify:1;
352 unsigned int op_recverr:1;
353 unsigned int op_mapped:1;
Andy Grover2c3a5f92010-03-01 16:10:40 -0800354 unsigned int op_silent:1;
Andy Grover15133f62010-01-12 14:33:38 -0800355 unsigned int op_active:1;
Andy Grover15133f62010-01-12 14:33:38 -0800356 struct scatterlist *op_sg;
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800357 struct rds_notifier *op_notifier;
Andy Grover15133f62010-01-12 14:33:38 -0800358
359 struct rds_mr *op_rdma_mr;
360 } atomic;
361 struct rm_rdma_op {
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800362 u32 op_rkey;
363 u64 op_remote_addr;
364 unsigned int op_write:1;
365 unsigned int op_fence:1;
366 unsigned int op_notify:1;
367 unsigned int op_recverr:1;
368 unsigned int op_mapped:1;
Andy Grover2c3a5f92010-03-01 16:10:40 -0800369 unsigned int op_silent:1;
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800370 unsigned int op_active:1;
371 unsigned int op_bytes;
372 unsigned int op_nents;
373 unsigned int op_count;
374 struct scatterlist *op_sg;
375 struct rds_notifier *op_notifier;
376
377 struct rds_mr *op_rdma_mr;
Andy Grovere7791372010-01-12 12:15:02 -0800378 } rdma;
Andy Grover15133f62010-01-12 14:33:38 -0800379 struct rm_data_op {
Andy Grover241eef32010-01-19 21:25:26 -0800380 unsigned int op_active:1;
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800381 unsigned int op_nents;
382 unsigned int op_count;
Wengang Wangd655a9f2015-05-21 13:11:40 +0800383 unsigned int op_dmasg;
384 unsigned int op_dmaoff;
Andy Grover6c7cc6e2010-01-27 18:04:18 -0800385 struct scatterlist *op_sg;
Andy Grovere7791372010-01-12 12:15:02 -0800386 } data;
387 };
Andy Grover39de8282009-02-24 15:30:19 +0000388};
389
390/*
391 * The RDS notifier is used (optionally) to tell the application about
392 * completed RDMA operations. Rather than keeping the whole rds message
393 * around on the queue, we allocate a small notifier that is put on the
394 * socket's notifier_list. Notifications are delivered to the application
395 * through control messages.
396 */
397struct rds_notifier {
398 struct list_head n_list;
399 uint64_t n_user_token;
400 int n_status;
401};
402
403/**
404 * struct rds_transport - transport specific behavioural hooks
405 *
406 * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
407 * part of a message. The caller serializes on the send_sem so this
408 * doesn't need to be reentrant for a given conn. The header must be
409 * sent before the data payload. .xmit must be prepared to send a
410 * message with no data payload. .xmit should return the number of
411 * bytes that were sent down the connection, including header bytes.
412 * Returning 0 tells the caller that it doesn't need to perform any
413 * additional work now. This is usually the case when the transport has
414 * filled the sending queue for its connection and will handle
415 * triggering the rds thread to continue the send when space becomes
416 * available. Returning -EAGAIN tells the caller to retry the send
417 * immediately. Returning -ENOMEM tells the caller to retry the send at
418 * some point in the future.
419 *
420 * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once
421 * it returns the connection can not call rds_recv_incoming().
422 * This will only be called once after conn_connect returns
423 * non-zero success and will The caller serializes this with
424 * the send and connecting paths (xmit_* and conn_*). The
425 * transport is responsible for other serialization, including
426 * rds_recv_incoming(). This is called in process context but
427 * should try hard not to block.
Andy Grover39de8282009-02-24 15:30:19 +0000428 */
429
430struct rds_transport {
431 char t_name[TRANSNAMSIZ];
432 struct list_head t_item;
433 struct module *t_owner;
434 unsigned int t_prefer_loopback:1;
Andy Grover335776b2009-08-21 12:28:34 +0000435 unsigned int t_type;
Andy Grover39de8282009-02-24 15:30:19 +0000436
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400437 int (*laddr_check)(struct net *net, __be32 addr);
Andy Grover39de8282009-02-24 15:30:19 +0000438 int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
439 void (*conn_free)(void *data);
440 int (*conn_connect)(struct rds_connection *conn);
441 void (*conn_shutdown)(struct rds_connection *conn);
442 void (*xmit_prepare)(struct rds_connection *conn);
443 void (*xmit_complete)(struct rds_connection *conn);
444 int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
445 unsigned int hdr_off, unsigned int sg, unsigned int off);
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800446 int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
Andy Groverff3d7d32010-03-01 14:03:09 -0800447 int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
Andy Grover39de8282009-02-24 15:30:19 +0000448 int (*recv)(struct rds_connection *conn);
Al Viroc310e722014-11-20 09:21:14 -0500449 int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
Andy Grover39de8282009-02-24 15:30:19 +0000450 void (*inc_free)(struct rds_incoming *inc);
451
452 int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
453 struct rdma_cm_event *event);
454 int (*cm_initiate_connect)(struct rdma_cm_id *cm_id);
455 void (*cm_connect_complete)(struct rds_connection *conn,
456 struct rdma_cm_event *event);
457
458 unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
459 unsigned int avail);
460 void (*exit)(void);
461 void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
462 struct rds_sock *rs, u32 *key_ret);
463 void (*sync_mr)(void *trans_private, int direction);
464 void (*free_mr)(void *trans_private, int invalidate);
465 void (*flush_mrs)(void);
466};
467
468struct rds_sock {
469 struct sock rs_sk;
470
471 u64 rs_user_addr;
472 u64 rs_user_bytes;
473
474 /*
475 * bound_addr used for both incoming and outgoing, no INADDR_ANY
476 * support.
477 */
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700478 struct rhash_head rs_bound_node;
479 u64 rs_bound_key;
Andy Grover39de8282009-02-24 15:30:19 +0000480 __be32 rs_bound_addr;
481 __be32 rs_conn_addr;
482 __be16 rs_bound_port;
483 __be16 rs_conn_port;
Andy Grover39de8282009-02-24 15:30:19 +0000484 struct rds_transport *rs_transport;
485
486 /*
487 * rds_sendmsg caches the conn it used the last time around.
488 * This helps avoid costly lookups.
489 */
490 struct rds_connection *rs_conn;
491
492 /* flag indicating we were congested or not */
493 int rs_congested;
Andy Groverb98ba522010-03-11 13:50:04 +0000494 /* seen congestion (ENOBUFS) when sending? */
495 int rs_seen_congestion;
Andy Grover39de8282009-02-24 15:30:19 +0000496
497 /* rs_lock protects all these adjacent members before the newline */
498 spinlock_t rs_lock;
499 struct list_head rs_send_queue;
500 u32 rs_snd_bytes;
501 int rs_rcv_bytes;
502 struct list_head rs_notify_queue; /* currently used for failed RDMAs */
503
504 /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
505 * to decide whether the application should be woken up.
506 * If not set, we use rs_cong_track to find out whether a cong map
507 * update arrived.
508 */
509 uint64_t rs_cong_mask;
510 uint64_t rs_cong_notify;
511 struct list_head rs_cong_list;
512 unsigned long rs_cong_track;
513
514 /*
515 * rs_recv_lock protects the receive queue, and is
516 * used to serialize with rds_release.
517 */
518 rwlock_t rs_recv_lock;
519 struct list_head rs_recv_queue;
520
521 /* just for stats reporting */
522 struct list_head rs_item;
523
524 /* these have their own lock */
525 spinlock_t rs_rdma_lock;
526 struct rb_root rs_rdma_keys;
527
528 /* Socket options - in case there will be more */
529 unsigned char rs_recverr,
530 rs_cong_monitor;
531};
532
533static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
534{
535 return container_of(sk, struct rds_sock, rs_sk);
536}
537static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
538{
539 return &rs->rs_sk;
540}
541
542/*
543 * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
544 * to account for overhead. We don't account for overhead, we just apply
545 * the number of payload bytes to the specified value.
546 */
547static inline int rds_sk_sndbuf(struct rds_sock *rs)
548{
549 return rds_rs_to_sk(rs)->sk_sndbuf / 2;
550}
551static inline int rds_sk_rcvbuf(struct rds_sock *rs)
552{
553 return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
554}
555
556struct rds_statistics {
557 uint64_t s_conn_reset;
558 uint64_t s_recv_drop_bad_checksum;
559 uint64_t s_recv_drop_old_seq;
560 uint64_t s_recv_drop_no_sock;
561 uint64_t s_recv_drop_dead_sock;
562 uint64_t s_recv_deliver_raced;
563 uint64_t s_recv_delivered;
564 uint64_t s_recv_queued;
565 uint64_t s_recv_immediate_retry;
566 uint64_t s_recv_delayed_retry;
567 uint64_t s_recv_ack_required;
568 uint64_t s_recv_rdma_bytes;
569 uint64_t s_recv_ping;
570 uint64_t s_send_queue_empty;
571 uint64_t s_send_queue_full;
Andy Grover049ee3f2010-03-23 17:39:07 -0700572 uint64_t s_send_lock_contention;
573 uint64_t s_send_lock_queue_raced;
Andy Grover39de8282009-02-24 15:30:19 +0000574 uint64_t s_send_immediate_retry;
575 uint64_t s_send_delayed_retry;
576 uint64_t s_send_drop_acked;
577 uint64_t s_send_ack_required;
578 uint64_t s_send_queued;
579 uint64_t s_send_rdma;
580 uint64_t s_send_rdma_bytes;
581 uint64_t s_send_pong;
582 uint64_t s_page_remainder_hit;
583 uint64_t s_page_remainder_miss;
584 uint64_t s_copy_to_user;
585 uint64_t s_copy_from_user;
586 uint64_t s_cong_update_queued;
587 uint64_t s_cong_update_received;
588 uint64_t s_cong_send_error;
589 uint64_t s_cong_send_blocked;
590};
591
592/* af_rds.c */
593void rds_sock_addref(struct rds_sock *rs);
594void rds_sock_put(struct rds_sock *rs);
595void rds_wake_sk_sleep(struct rds_sock *rs);
596static inline void __rds_wake_sk_sleep(struct sock *sk)
597{
Eric Dumazetaa395142010-04-20 13:03:51 +0000598 wait_queue_head_t *waitq = sk_sleep(sk);
Andy Grover39de8282009-02-24 15:30:19 +0000599
600 if (!sock_flag(sk, SOCK_DEAD) && waitq)
601 wake_up(waitq);
602}
603extern wait_queue_head_t rds_poll_waitq;
604
605
606/* bind.c */
607int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
608void rds_remove_bound(struct rds_sock *rs);
609struct rds_sock *rds_find_bound(__be32 addr, __be16 port);
santosh.shilimkar@oracle.com7b565432015-10-30 08:49:10 -0700610int rds_bind_lock_init(void);
611void rds_bind_lock_destroy(void);
Andy Grover39de8282009-02-24 15:30:19 +0000612
613/* cong.c */
614int rds_cong_get_maps(struct rds_connection *conn);
615void rds_cong_add_conn(struct rds_connection *conn);
616void rds_cong_remove_conn(struct rds_connection *conn);
617void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
618void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
619int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
620void rds_cong_queue_updates(struct rds_cong_map *map);
621void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
622int rds_cong_updated_since(unsigned long *recent);
623void rds_cong_add_socket(struct rds_sock *);
624void rds_cong_remove_socket(struct rds_sock *);
625void rds_cong_exit(void);
626struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
627
628/* conn.c */
Zach Brownef87b7e2010-07-09 12:26:20 -0700629int rds_conn_init(void);
Andy Grover39de8282009-02-24 15:30:19 +0000630void rds_conn_exit(void);
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400631struct rds_connection *rds_conn_create(struct net *net,
632 __be32 laddr, __be32 faddr,
Andy Grover39de8282009-02-24 15:30:19 +0000633 struct rds_transport *trans, gfp_t gfp);
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400634struct rds_connection *rds_conn_create_outgoing(struct net *net,
635 __be32 laddr, __be32 faddr,
Andy Grover39de8282009-02-24 15:30:19 +0000636 struct rds_transport *trans, gfp_t gfp);
Andy Grover2dc39352010-06-11 13:49:13 -0700637void rds_conn_shutdown(struct rds_connection *conn);
Andy Grover39de8282009-02-24 15:30:19 +0000638void rds_conn_destroy(struct rds_connection *conn);
Andy Grover39de8282009-02-24 15:30:19 +0000639void rds_conn_drop(struct rds_connection *conn);
Zach Brownf3c68082010-05-24 13:14:36 -0700640void rds_conn_connect_if_down(struct rds_connection *conn);
Andy Grover39de8282009-02-24 15:30:19 +0000641void rds_for_each_conn_info(struct socket *sock, unsigned int len,
642 struct rds_info_iterator *iter,
643 struct rds_info_lengths *lens,
644 int (*visitor)(struct rds_connection *, void *),
645 size_t item_len);
Joe Perchesb9075fa2011-10-31 17:11:33 -0700646__printf(2, 3)
647void __rds_conn_error(struct rds_connection *conn, const char *, ...);
Andy Grover39de8282009-02-24 15:30:19 +0000648#define rds_conn_error(conn, fmt...) \
649 __rds_conn_error(conn, KERN_WARNING "RDS: " fmt)
650
651static inline int
652rds_conn_transition(struct rds_connection *conn, int old, int new)
653{
654 return atomic_cmpxchg(&conn->c_state, old, new) == old;
655}
656
657static inline int
658rds_conn_state(struct rds_connection *conn)
659{
660 return atomic_read(&conn->c_state);
661}
662
663static inline int
664rds_conn_up(struct rds_connection *conn)
665{
666 return atomic_read(&conn->c_state) == RDS_CONN_UP;
667}
668
669static inline int
670rds_conn_connecting(struct rds_connection *conn)
671{
672 return atomic_read(&conn->c_state) == RDS_CONN_CONNECTING;
673}
674
675/* message.c */
676struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
Andy Groverfc445082010-01-12 12:56:06 -0800677struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
Al Viro083735f2014-11-20 09:31:08 -0500678int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from);
Andy Grover39de8282009-02-24 15:30:19 +0000679struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
680void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
681 __be16 dport, u64 seq);
682int rds_message_add_extension(struct rds_header *hdr,
683 unsigned int type, const void *data, unsigned int len);
684int rds_message_next_extension(struct rds_header *hdr,
685 unsigned int *pos, void *buf, unsigned int *buflen);
Andy Grover39de8282009-02-24 15:30:19 +0000686int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
Al Viroc310e722014-11-20 09:21:14 -0500687int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
Andy Grover39de8282009-02-24 15:30:19 +0000688void rds_message_inc_free(struct rds_incoming *inc);
689void rds_message_addref(struct rds_message *rm);
690void rds_message_put(struct rds_message *rm);
691void rds_message_wait(struct rds_message *rm);
692void rds_message_unmapped(struct rds_message *rm);
693
694static inline void rds_message_make_checksum(struct rds_header *hdr)
695{
696 hdr->h_csum = 0;
697 hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
698}
699
700static inline int rds_message_verify_checksum(const struct rds_header *hdr)
701{
702 return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
703}
704
705
706/* page.c */
707int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
708 gfp_t gfp);
709int rds_page_copy_user(struct page *page, unsigned long offset,
710 void __user *ptr, unsigned long bytes,
711 int to_user);
712#define rds_page_copy_to_user(page, offset, ptr, bytes) \
713 rds_page_copy_user(page, offset, ptr, bytes, 1)
714#define rds_page_copy_from_user(page, offset, ptr, bytes) \
715 rds_page_copy_user(page, offset, ptr, bytes, 0)
716void rds_page_exit(void);
717
718/* recv.c */
719void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
720 __be32 saddr);
Andy Grover39de8282009-02-24 15:30:19 +0000721void rds_inc_put(struct rds_incoming *inc);
722void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr,
Cong Wang6114eab2011-11-25 23:14:40 +0800723 struct rds_incoming *inc, gfp_t gfp);
Ying Xue1b784142015-03-02 15:37:48 +0800724int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
725 int msg_flags);
Andy Grover39de8282009-02-24 15:30:19 +0000726void rds_clear_recv_queue(struct rds_sock *rs);
727int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
728void rds_inc_info_copy(struct rds_incoming *inc,
729 struct rds_info_iterator *iter,
730 __be32 saddr, __be32 daddr, int flip);
731
732/* send.c */
Ying Xue1b784142015-03-02 15:37:48 +0800733int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
Andy Grover39de8282009-02-24 15:30:19 +0000734void rds_send_reset(struct rds_connection *conn);
735int rds_send_xmit(struct rds_connection *conn);
736struct sockaddr_in;
737void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest);
738typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
739void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
740 is_acked_func is_acked);
Andy Grover39de8282009-02-24 15:30:19 +0000741int rds_send_pong(struct rds_connection *conn, __be16 dport);
742struct rds_message *rds_send_get_message(struct rds_connection *,
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800743 struct rm_rdma_op *);
Andy Grover39de8282009-02-24 15:30:19 +0000744
745/* rdma.c */
746void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
Andy Grover21f79af2010-01-12 12:57:27 -0800747int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen);
748int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
749int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
750void rds_rdma_drop_keys(struct rds_sock *rs);
751int rds_rdma_extra_size(struct rds_rdma_args *args);
752int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
753 struct cmsghdr *cmsg);
754int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
755 struct cmsghdr *cmsg);
756int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
757 struct cmsghdr *cmsg);
758int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
759 struct cmsghdr *cmsg);
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800760void rds_rdma_free_op(struct rm_rdma_op *ro);
Andy Groverd0ab25a2010-01-27 16:15:48 -0800761void rds_atomic_free_op(struct rm_atomic_op *ao);
Andy Grover15133f62010-01-12 14:33:38 -0800762void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
763void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
764int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
765 struct cmsghdr *cmsg);
Andy Grover21f79af2010-01-12 12:57:27 -0800766
Joe Perchesc1b12032013-10-18 13:48:25 -0700767void __rds_put_mr_final(struct rds_mr *mr);
Andy Grover21f79af2010-01-12 12:57:27 -0800768static inline void rds_mr_put(struct rds_mr *mr)
769{
770 if (atomic_dec_and_test(&mr->r_refcount))
771 __rds_put_mr_final(mr);
772}
Andy Grover39de8282009-02-24 15:30:19 +0000773
774/* stats.c */
David Howells9b8de742009-04-21 23:00:24 +0100775DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
Andy Grover39de8282009-02-24 15:30:19 +0000776#define rds_stats_inc_which(which, member) do { \
777 per_cpu(which, get_cpu()).member++; \
778 put_cpu(); \
779} while (0)
780#define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
781#define rds_stats_add_which(which, member, count) do { \
782 per_cpu(which, get_cpu()).member += count; \
783 put_cpu(); \
784} while (0)
785#define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
Zach Brownef87b7e2010-07-09 12:26:20 -0700786int rds_stats_init(void);
Andy Grover39de8282009-02-24 15:30:19 +0000787void rds_stats_exit(void);
788void rds_stats_info_copy(struct rds_info_iterator *iter,
Jan Engelhardt36cbd3d2009-08-05 10:42:58 -0700789 uint64_t *values, const char *const *names,
790 size_t nr);
Andy Grover39de8282009-02-24 15:30:19 +0000791
792/* sysctl.c */
Zach Brownef87b7e2010-07-09 12:26:20 -0700793int rds_sysctl_init(void);
Andy Grover39de8282009-02-24 15:30:19 +0000794void rds_sysctl_exit(void);
795extern unsigned long rds_sysctl_sndbuf_min;
796extern unsigned long rds_sysctl_sndbuf_default;
797extern unsigned long rds_sysctl_sndbuf_max;
798extern unsigned long rds_sysctl_reconnect_min_jiffies;
799extern unsigned long rds_sysctl_reconnect_max_jiffies;
800extern unsigned int rds_sysctl_max_unacked_packets;
801extern unsigned int rds_sysctl_max_unacked_bytes;
802extern unsigned int rds_sysctl_ping_enable;
803extern unsigned long rds_sysctl_trace_flags;
804extern unsigned int rds_sysctl_trace_level;
805
806/* threads.c */
Zach Brownef87b7e2010-07-09 12:26:20 -0700807int rds_threads_init(void);
Andy Grover39de8282009-02-24 15:30:19 +0000808void rds_threads_exit(void);
809extern struct workqueue_struct *rds_wq;
Andy Grover2dc39352010-06-11 13:49:13 -0700810void rds_queue_reconnect(struct rds_connection *conn);
Andy Grover39de8282009-02-24 15:30:19 +0000811void rds_connect_worker(struct work_struct *);
812void rds_shutdown_worker(struct work_struct *);
813void rds_send_worker(struct work_struct *);
814void rds_recv_worker(struct work_struct *);
815void rds_connect_complete(struct rds_connection *conn);
816
817/* transport.c */
818int rds_trans_register(struct rds_transport *trans);
819void rds_trans_unregister(struct rds_transport *trans);
Sowmini Varadhand5a8ac22015-08-05 01:43:25 -0400820struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr);
Zach Brown5adb5bc2010-07-23 10:32:31 -0700821void rds_trans_put(struct rds_transport *trans);
Andy Grover39de8282009-02-24 15:30:19 +0000822unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
823 unsigned int avail);
Sowmini Varadhand97dac52015-05-29 17:28:08 -0400824struct rds_transport *rds_trans_get(int t_type);
Zach Brownef87b7e2010-07-09 12:26:20 -0700825int rds_trans_init(void);
Andy Grover39de8282009-02-24 15:30:19 +0000826void rds_trans_exit(void);
827
828#endif