Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
39de8281 AG |
2 | #ifndef _RDS_RDS_H |
3 | #define _RDS_RDS_H | |
4 | ||
5 | #include <net/sock.h> | |
6 | #include <linux/scatterlist.h> | |
7 | #include <linux/highmem.h> | |
8 | #include <rdma/rdma_cm.h> | |
9 | #include <linux/mutex.h> | |
10 | #include <linux/rds.h> | |
7b565434 | 11 | #include <linux/rhashtable.h> |
b7f02920 | 12 | #include <linux/refcount.h> |
eee2fa6a | 13 | #include <linux/in6.h> |
39de8281 AG |
14 | |
15 | #include "info.h" | |
16 | ||
17 | /* | |
18 | * RDS Network protocol version | |
19 | */ | |
20 | #define RDS_PROTOCOL_3_0 0x0300 | |
21 | #define RDS_PROTOCOL_3_1 0x0301 | |
22 | #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 | |
23 | #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) | |
24 | #define RDS_PROTOCOL_MINOR(v) ((v) & 255) | |
25 | #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) | |
26 | ||
1e2b44e7 KCP |
27 | /* The following ports, 16385, 18634, 18635, are registered with IANA as |
28 | * the ports to be used for RDS over TCP and UDP. Currently, only RDS over | |
29 | * TCP and RDS over IB/RDMA are implemented. 18634 is the historical value | |
30 | * used for the RDMA_CM listener port. RDS/TCP uses port 16385. After | |
31 | * IPv6 work, RDMA_CM also uses 16385 as the listener port. 18634 is kept | |
32 | * to ensure compatibility with older RDS modules. Those ports are defined | |
33 | * in each transport's header file. | |
39de8281 AG |
34 | */ |
35 | #define RDS_PORT 18634 | |
36 | ||
8cbd9606 AG |
37 | #ifdef ATOMIC64_INIT |
38 | #define KERNEL_HAS_ATOMIC64 | |
39 | #endif | |
40 | ||
ff57087f | 41 | #ifdef RDS_DEBUG |
39de8281 AG |
42 | #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) |
43 | #else | |
44 | /* sigh, pr_debug() causes unused variable warnings */ | |
b9075fa9 JP |
45 | static inline __printf(1, 2) |
46 | void rdsdebug(char *fmt, ...) | |
39de8281 AG |
47 | { |
48 | } | |
49 | #endif | |
50 | ||
51 | /* XXX is there one of these somewhere? */ | |
52 | #define ceil(x, y) \ | |
53 | ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) | |
54 | ||
55 | #define RDS_FRAG_SHIFT 12 | |
56 | #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) | |
57 | ||
f9fb69ad AR |
58 | /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ |
59 | #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) | |
60 | ||
39de8281 | 61 | #define RDS_CONG_MAP_BYTES (65536 / 8) |
39de8281 AG |
62 | #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) |
63 | #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) | |
64 | ||
65 | struct rds_cong_map { | |
66 | struct rb_node m_rb_node; | |
eee2fa6a | 67 | struct in6_addr m_addr; |
39de8281 AG |
68 | wait_queue_head_t m_waitq; |
69 | struct list_head m_conn_list; | |
70 | unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; | |
71 | }; | |
72 | ||
73 | ||
74 | /* | |
75 | * This is how we will track the connection state: | |
76 | * A connection is always in one of the following | |
77 | * states. Updates to the state are atomic and imply | |
78 | * a memory barrier. | |
79 | */ | |
80 | enum { | |
81 | RDS_CONN_DOWN = 0, | |
82 | RDS_CONN_CONNECTING, | |
83 | RDS_CONN_DISCONNECTING, | |
84 | RDS_CONN_UP, | |
9c79440e | 85 | RDS_CONN_RESETTING, |
39de8281 AG |
86 | RDS_CONN_ERROR, |
87 | }; | |
88 | ||
89 | /* Bits for c_flags */ | |
90 | #define RDS_LL_SEND_FULL 0 | |
91 | #define RDS_RECONNECT_PENDING 1 | |
0f4b1c7e | 92 | #define RDS_IN_XMIT 2 |
73ce4317 | 93 | #define RDS_RECV_REFILL 3 |
c90ecbfa | 94 | #define RDS_DESTROY_PENDING 4 |
39de8281 | 95 | |
0cb43965 | 96 | /* Max number of multipaths per RDS connection. Must be a power of 2 */ |
5916e2c1 SV |
97 | #define RDS_MPATH_WORKERS 8 |
98 | #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ | |
99 | (rs)->rs_hash_initval) & ((n) - 1)) | |
0cb43965 | 100 | |
00354de5 SV |
101 | #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) |
102 | ||
0cb43965 SV |
103 | /* Per mpath connection state */ |
104 | struct rds_conn_path { | |
105 | struct rds_connection *cp_conn; | |
106 | struct rds_message *cp_xmit_rm; | |
107 | unsigned long cp_xmit_sg; | |
108 | unsigned int cp_xmit_hdr_off; | |
109 | unsigned int cp_xmit_data_off; | |
110 | unsigned int cp_xmit_atomic_sent; | |
111 | unsigned int cp_xmit_rdma_sent; | |
112 | unsigned int cp_xmit_data_sent; | |
113 | ||
114 | spinlock_t cp_lock; /* protect msg queues */ | |
115 | u64 cp_next_tx_seq; | |
116 | struct list_head cp_send_queue; | |
117 | struct list_head cp_retrans; | |
118 | ||
119 | u64 cp_next_rx_seq; | |
120 | ||
121 | void *cp_transport_data; | |
122 | ||
123 | atomic_t cp_state; | |
124 | unsigned long cp_send_gen; | |
125 | unsigned long cp_flags; | |
126 | unsigned long cp_reconnect_jiffies; | |
127 | struct delayed_work cp_send_w; | |
128 | struct delayed_work cp_recv_w; | |
129 | struct delayed_work cp_conn_w; | |
130 | struct work_struct cp_down_w; | |
131 | struct mutex cp_cm_lock; /* protect cp_state & cm */ | |
132 | wait_queue_head_t cp_waitq; | |
133 | ||
134 | unsigned int cp_unacked_packets; | |
135 | unsigned int cp_unacked_bytes; | |
0cb43965 SV |
136 | unsigned int cp_index; |
137 | }; | |
138 | ||
139 | /* One rds_connection per RDS address pair */ | |
39de8281 AG |
140 | struct rds_connection { |
141 | struct hlist_node c_hash_node; | |
eee2fa6a KCP |
142 | struct in6_addr c_laddr; |
143 | struct in6_addr c_faddr; | |
1e2b44e7 KCP |
144 | int c_dev_if; /* ifindex used for this conn */ |
145 | int c_bound_if; /* ifindex of c_laddr */ | |
3b20fc38 | 146 | unsigned int c_loopback:1, |
eee2fa6a | 147 | c_isv6:1, |
5916e2c1 | 148 | c_ping_triggered:1, |
eee2fa6a | 149 | c_pad_to_32:29; |
0cb43965 | 150 | int c_npaths; |
39de8281 | 151 | struct rds_connection *c_passive; |
0cb43965 | 152 | struct rds_transport *c_trans; |
39de8281 AG |
153 | |
154 | struct rds_cong_map *c_lcong; | |
155 | struct rds_cong_map *c_fcong; | |
156 | ||
0cb43965 SV |
157 | /* Protocol version */ |
158 | unsigned int c_version; | |
681648e6 | 159 | possible_net_t c_net; |
39de8281 AG |
160 | |
161 | struct list_head c_map_item; | |
162 | unsigned long c_map_queued; | |
39de8281 | 163 | |
840df162 | 164 | struct rds_conn_path *c_path; |
5916e2c1 | 165 | wait_queue_head_t c_hs_waitq; /* handshake waitq */ |
905dd418 SV |
166 | |
167 | u32 c_my_gen_num; | |
168 | u32 c_peer_gen_num; | |
39de8281 AG |
169 | }; |
170 | ||
d5a8ac28 SV |
171 | static inline |
172 | struct net *rds_conn_net(struct rds_connection *conn) | |
173 | { | |
681648e6 | 174 | return read_pnet(&conn->c_net); |
d5a8ac28 SV |
175 | } |
176 | ||
177 | static inline | |
178 | void rds_conn_net_set(struct rds_connection *conn, struct net *net) | |
179 | { | |
681648e6 | 180 | write_pnet(&conn->c_net, net); |
d5a8ac28 SV |
181 | } |
182 | ||
39de8281 AG |
183 | #define RDS_FLAG_CONG_BITMAP 0x01 |
184 | #define RDS_FLAG_ACK_REQUIRED 0x02 | |
185 | #define RDS_FLAG_RETRANSMITTED 0x04 | |
7b70d033 | 186 | #define RDS_MAX_ADV_CREDIT 255 |
39de8281 | 187 | |
5916e2c1 SV |
188 | /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping |
189 | * probe to exchange control information before establishing a connection. | |
190 | * Currently the control information that is exchanged is the number of | |
191 | * supported paths. If the peer is a legacy (older kernel revision) peer, | |
192 | * it would return a pong message without additional control information | |
193 | * that would then alert the sender that the peer was an older rev. | |
194 | */ | |
195 | #define RDS_FLAG_PROBE_PORT 1 | |
196 | #define RDS_HS_PROBE(sport, dport) \ | |
197 | ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ | |
198 | (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) | |
39de8281 AG |
199 | /* |
200 | * Maximum space available for extension headers. | |
201 | */ | |
202 | #define RDS_HEADER_EXT_SPACE 16 | |
203 | ||
204 | struct rds_header { | |
205 | __be64 h_sequence; | |
206 | __be64 h_ack; | |
207 | __be32 h_len; | |
208 | __be16 h_sport; | |
209 | __be16 h_dport; | |
210 | u8 h_flags; | |
211 | u8 h_credit; | |
212 | u8 h_padding[4]; | |
213 | __sum16 h_csum; | |
214 | ||
215 | u8 h_exthdr[RDS_HEADER_EXT_SPACE]; | |
216 | }; | |
217 | ||
218 | /* | |
219 | * Reserved - indicates end of extensions | |
220 | */ | |
221 | #define RDS_EXTHDR_NONE 0 | |
222 | ||
223 | /* | |
224 | * This extension header is included in the very | |
225 | * first message that is sent on a new connection, | |
226 | * and identifies the protocol level. This will help | |
227 | * rolling updates if a future change requires breaking | |
228 | * the protocol. | |
229 | * NB: This is no longer true for IB, where we do a version | |
230 | * negotiation during the connection setup phase (protocol | |
231 | * version information is included in the RDMA CM private data). | |
232 | */ | |
233 | #define RDS_EXTHDR_VERSION 1 | |
234 | struct rds_ext_header_version { | |
235 | __be32 h_version; | |
236 | }; | |
237 | ||
238 | /* | |
239 | * This extension header is included in the RDS message | |
240 | * chasing an RDMA operation. | |
241 | */ | |
242 | #define RDS_EXTHDR_RDMA 2 | |
243 | struct rds_ext_header_rdma { | |
244 | __be32 h_rdma_rkey; | |
245 | }; | |
246 | ||
247 | /* | |
248 | * This extension header tells the peer about the | |
249 | * destination <R_Key,offset> of the requested RDMA | |
250 | * operation. | |
251 | */ | |
252 | #define RDS_EXTHDR_RDMA_DEST 3 | |
253 | struct rds_ext_header_rdma_dest { | |
254 | __be32 h_rdma_rkey; | |
255 | __be32 h_rdma_offset; | |
256 | }; | |
257 | ||
5916e2c1 SV |
258 | /* Extension header announcing number of paths. |
259 | * Implicit length = 2 bytes. | |
260 | */ | |
905dd418 SV |
261 | #define RDS_EXTHDR_NPATHS 5 |
262 | #define RDS_EXTHDR_GEN_NUM 6 | |
5916e2c1 | 263 | |
39de8281 | 264 | #define __RDS_EXTHDR_MAX 16 /* for now */ |
3289025a SS |
265 | #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) |
266 | #define RDS_MSG_RX_HDR 0 | |
267 | #define RDS_MSG_RX_START 1 | |
268 | #define RDS_MSG_RX_END 2 | |
269 | #define RDS_MSG_RX_CMSG 3 | |
39de8281 AG |
270 | |
271 | struct rds_incoming { | |
b7f02920 | 272 | refcount_t i_refcount; |
39de8281 AG |
273 | struct list_head i_item; |
274 | struct rds_connection *i_conn; | |
ef9e62c2 | 275 | struct rds_conn_path *i_conn_path; |
39de8281 AG |
276 | struct rds_header i_hdr; |
277 | unsigned long i_rx_jiffies; | |
eee2fa6a | 278 | struct in6_addr i_saddr; |
39de8281 AG |
279 | |
280 | rds_rdma_cookie_t i_rdma_cookie; | |
2de9d505 | 281 | ktime_t i_rx_tstamp; |
3289025a | 282 | u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; |
39de8281 AG |
283 | }; |
284 | ||
21f79afa AG |
285 | struct rds_mr { |
286 | struct rb_node r_rb_node; | |
803ea850 | 287 | refcount_t r_refcount; |
21f79afa AG |
288 | u32 r_key; |
289 | ||
290 | /* A copy of the creation flags */ | |
291 | unsigned int r_use_once:1; | |
292 | unsigned int r_invalidate:1; | |
293 | unsigned int r_write:1; | |
294 | ||
295 | /* This is for RDS_MR_DEAD. | |
296 | * It would be nice & consistent to make this part of the above | |
297 | * bit field here, but we need to use test_and_set_bit. | |
298 | */ | |
299 | unsigned long r_state; | |
300 | struct rds_sock *r_sock; /* back pointer to the socket that owns us */ | |
301 | struct rds_transport *r_trans; | |
302 | void *r_trans_private; | |
303 | }; | |
304 | ||
305 | /* Flags for mr->r_state */ | |
306 | #define RDS_MR_DEAD 0 | |
307 | ||
21f79afa AG |
308 | static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) |
309 | { | |
310 | return r_key | (((u64) offset) << 32); | |
311 | } | |
312 | ||
313 | static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) | |
314 | { | |
315 | return cookie; | |
316 | } | |
317 | ||
318 | static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) | |
319 | { | |
320 | return cookie >> 32; | |
321 | } | |
322 | ||
15133f6e AG |
323 | /* atomic operation types */ |
324 | #define RDS_ATOMIC_TYPE_CSWP 0 | |
325 | #define RDS_ATOMIC_TYPE_FADD 1 | |
326 | ||
39de8281 AG |
327 | /* |
328 | * m_sock_item and m_conn_item are on lists that are serialized under | |
329 | * conn->c_lock. m_sock_item has additional meaning in that once it is empty | |
330 | * the message will not be put back on the retransmit list after being sent. | |
331 | * messages that are canceled while being sent rely on this. | |
332 | * | |
333 | * m_inc is used by loopback so that it can pass an incoming message straight | |
334 | * back up into the rx path. It embeds a wire header which is also used by | |
335 | * the send path, which is kind of awkward. | |
336 | * | |
337 | * m_sock_item indicates the message's presence on a socket's send or receive | |
338 | * queue. m_rs will point to that socket. | |
339 | * | |
340 | * m_daddr is used by cancellation to prune messages to a given destination. | |
341 | * | |
342 | * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock | |
343 | * nesting. As paths iterate over messages on a sock, or conn, they must | |
344 | * also lock the conn, or sock, to remove the message from those lists too. | |
345 | * Testing the flag to determine if the message is still on the lists lets | |
346 | * us avoid testing the list_head directly. That means each path can use | |
347 | * the message's list_head to keep it on a local list while juggling locks | |
348 | * without confusing the other path. | |
349 | * | |
350 | * m_ack_seq is an optional field set by transports who need a different | |
351 | * sequence number range to invalidate. They can use this in a callback | |
352 | * that they pass to rds_send_drop_acked() to see if each message has been | |
353 | * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't | |
354 | * had ack_seq set yet. | |
355 | */ | |
356 | #define RDS_MSG_ON_SOCK 1 | |
357 | #define RDS_MSG_ON_CONN 2 | |
358 | #define RDS_MSG_HAS_ACK_SEQ 3 | |
359 | #define RDS_MSG_ACK_REQUIRED 4 | |
360 | #define RDS_MSG_RETRANSMITTED 5 | |
361 | #define RDS_MSG_MAPPED 6 | |
362 | #define RDS_MSG_PAGEVEC 7 | |
905dd418 | 363 | #define RDS_MSG_FLUSH 8 |
39de8281 | 364 | |
01883eda | 365 | struct rds_znotifier { |
01883eda SV |
366 | struct mmpin z_mmp; |
367 | u32 z_cookie; | |
368 | }; | |
369 | ||
9426bbc6 SV |
370 | struct rds_msg_zcopy_info { |
371 | struct list_head rs_zcookie_next; | |
372 | union { | |
373 | struct rds_znotifier znotif; | |
374 | struct rds_zcopy_cookies zcookies; | |
375 | }; | |
376 | }; | |
01883eda | 377 | |
9426bbc6 SV |
378 | struct rds_msg_zcopy_queue { |
379 | struct list_head zcookie_head; | |
380 | spinlock_t lock; /* protects zcookie_head queue */ | |
381 | }; | |
382 | ||
383 | static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q) | |
01883eda | 384 | { |
9426bbc6 SV |
385 | spin_lock_init(&q->lock); |
386 | INIT_LIST_HEAD(&q->zcookie_head); | |
01883eda SV |
387 | } |
388 | ||
ea010070 | 389 | struct rds_iov_vector { |
390 | struct rds_iovec *iov; | |
391 | int len; | |
392 | }; | |
393 | ||
394 | struct rds_iov_vector_arr { | |
395 | struct rds_iov_vector *vec; | |
396 | int len; | |
397 | int indx; | |
398 | int incr; | |
399 | }; | |
400 | ||
39de8281 | 401 | struct rds_message { |
6c5a1c4a | 402 | refcount_t m_refcount; |
39de8281 AG |
403 | struct list_head m_sock_item; |
404 | struct list_head m_conn_item; | |
405 | struct rds_incoming m_inc; | |
406 | u64 m_ack_seq; | |
eee2fa6a | 407 | struct in6_addr m_daddr; |
39de8281 AG |
408 | unsigned long m_flags; |
409 | ||
410 | /* Never access m_rs without holding m_rs_lock. | |
411 | * Lock nesting is | |
412 | * rm->m_rs_lock | |
413 | * -> rs->rs_lock | |
414 | */ | |
415 | spinlock_t m_rs_lock; | |
c83188dc CM |
416 | wait_queue_head_t m_flush_wait; |
417 | ||
39de8281 | 418 | struct rds_sock *m_rs; |
7e3bd65e AG |
419 | |
420 | /* cookie to send to remote, in rds header */ | |
39de8281 | 421 | rds_rdma_cookie_t m_rdma_cookie; |
7e3bd65e AG |
422 | |
423 | unsigned int m_used_sgs; | |
424 | unsigned int m_total_sgs; | |
425 | ||
ff3d7d36 AG |
426 | void *m_final_op; |
427 | ||
e779137a | 428 | struct { |
15133f6e AG |
429 | struct rm_atomic_op { |
430 | int op_type; | |
20c72bd5 AG |
431 | union { |
432 | struct { | |
433 | uint64_t compare; | |
434 | uint64_t swap; | |
435 | uint64_t compare_mask; | |
436 | uint64_t swap_mask; | |
437 | } op_m_cswp; | |
438 | struct { | |
439 | uint64_t add; | |
440 | uint64_t nocarry_mask; | |
441 | } op_m_fadd; | |
442 | }; | |
15133f6e AG |
443 | |
444 | u32 op_rkey; | |
445 | u64 op_remote_addr; | |
446 | unsigned int op_notify:1; | |
447 | unsigned int op_recverr:1; | |
448 | unsigned int op_mapped:1; | |
2c3a5f9a | 449 | unsigned int op_silent:1; |
15133f6e | 450 | unsigned int op_active:1; |
15133f6e | 451 | struct scatterlist *op_sg; |
f8b3aaf2 | 452 | struct rds_notifier *op_notifier; |
15133f6e AG |
453 | |
454 | struct rds_mr *op_rdma_mr; | |
455 | } atomic; | |
456 | struct rm_rdma_op { | |
f8b3aaf2 AG |
457 | u32 op_rkey; |
458 | u64 op_remote_addr; | |
459 | unsigned int op_write:1; | |
460 | unsigned int op_fence:1; | |
461 | unsigned int op_notify:1; | |
462 | unsigned int op_recverr:1; | |
463 | unsigned int op_mapped:1; | |
2c3a5f9a | 464 | unsigned int op_silent:1; |
f8b3aaf2 AG |
465 | unsigned int op_active:1; |
466 | unsigned int op_bytes; | |
467 | unsigned int op_nents; | |
468 | unsigned int op_count; | |
469 | struct scatterlist *op_sg; | |
470 | struct rds_notifier *op_notifier; | |
471 | ||
472 | struct rds_mr *op_rdma_mr; | |
e779137a | 473 | } rdma; |
15133f6e | 474 | struct rm_data_op { |
241eef3e | 475 | unsigned int op_active:1; |
941f8d55 | 476 | unsigned int op_notify:1; |
6c7cc6e4 AG |
477 | unsigned int op_nents; |
478 | unsigned int op_count; | |
d655a9fb WW |
479 | unsigned int op_dmasg; |
480 | unsigned int op_dmaoff; | |
01883eda | 481 | struct rds_znotifier *op_mmp_znotifier; |
6c7cc6e4 | 482 | struct scatterlist *op_sg; |
e779137a AG |
483 | } data; |
484 | }; | |
9e630bcb AR |
485 | |
486 | struct rds_conn_path *m_conn_path; | |
39de8281 AG |
487 | }; |
488 | ||
489 | /* | |
490 | * The RDS notifier is used (optionally) to tell the application about | |
491 | * completed RDMA operations. Rather than keeping the whole rds message | |
492 | * around on the queue, we allocate a small notifier that is put on the | |
493 | * socket's notifier_list. Notifications are delivered to the application | |
494 | * through control messages. | |
495 | */ | |
496 | struct rds_notifier { | |
497 | struct list_head n_list; | |
498 | uint64_t n_user_token; | |
499 | int n_status; | |
500 | }; | |
501 | ||
f1693c63 SS |
502 | /* Available as part of RDS core, so doesn't need to participate |
503 | * in get_preferred transport etc | |
504 | */ | |
505 | #define RDS_TRANS_LOOP 3 | |
506 | ||
39de8281 AG |
507 | /** |
508 | * struct rds_transport - transport specific behavioural hooks | |
509 | * | |
510 | * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send | |
511 | * part of a message. The caller serializes on the send_sem so this | |
512 | * doesn't need to be reentrant for a given conn. The header must be | |
513 | * sent before the data payload. .xmit must be prepared to send a | |
514 | * message with no data payload. .xmit should return the number of | |
515 | * bytes that were sent down the connection, including header bytes. | |
516 | * Returning 0 tells the caller that it doesn't need to perform any | |
517 | * additional work now. This is usually the case when the transport has | |
518 | * filled the sending queue for its connection and will handle | |
519 | * triggering the rds thread to continue the send when space becomes | |
520 | * available. Returning -EAGAIN tells the caller to retry the send | |
521 | * immediately. Returning -ENOMEM tells the caller to retry the send at | |
522 | * some point in the future. | |
523 | * | |
524 | * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once | |
525 | * it returns the connection can not call rds_recv_incoming(). | |
526 | * This will only be called once after conn_connect returns | |
527 | * non-zero success and will The caller serializes this with | |
528 | * the send and connecting paths (xmit_* and conn_*). The | |
529 | * transport is responsible for other serialization, including | |
530 | * rds_recv_incoming(). This is called in process context but | |
531 | * should try hard not to block. | |
39de8281 AG |
532 | */ |
533 | ||
534 | struct rds_transport { | |
535 | char t_name[TRANSNAMSIZ]; | |
536 | struct list_head t_item; | |
537 | struct module *t_owner; | |
7e8f4413 SV |
538 | unsigned int t_prefer_loopback:1, |
539 | t_mp_capable:1; | |
335776bd | 540 | unsigned int t_type; |
39de8281 | 541 | |
eee2fa6a KCP |
542 | int (*laddr_check)(struct net *net, const struct in6_addr *addr, |
543 | __u32 scope_id); | |
39de8281 AG |
544 | int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); |
545 | void (*conn_free)(void *data); | |
b04e8554 | 546 | int (*conn_path_connect)(struct rds_conn_path *cp); |
d769ef81 | 547 | void (*conn_path_shutdown)(struct rds_conn_path *conn); |
1f9ecd7e | 548 | void (*xmit_path_prepare)(struct rds_conn_path *cp); |
1f9ecd7e | 549 | void (*xmit_path_complete)(struct rds_conn_path *cp); |
39de8281 AG |
550 | int (*xmit)(struct rds_connection *conn, struct rds_message *rm, |
551 | unsigned int hdr_off, unsigned int sg, unsigned int off); | |
f8b3aaf2 | 552 | int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); |
ff3d7d36 | 553 | int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); |
2da43c4a | 554 | int (*recv_path)(struct rds_conn_path *cp); |
c310e72c | 555 | int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
556 | void (*inc_free)(struct rds_incoming *inc); |
557 | ||
558 | int (*cm_handle_connect)(struct rdma_cm_id *cm_id, | |
eee2fa6a KCP |
559 | struct rdma_cm_event *event, bool isv6); |
560 | int (*cm_initiate_connect)(struct rdma_cm_id *cm_id, bool isv6); | |
39de8281 AG |
561 | void (*cm_connect_complete)(struct rds_connection *conn, |
562 | struct rdma_cm_event *event); | |
563 | ||
564 | unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, | |
565 | unsigned int avail); | |
566 | void (*exit)(void); | |
567 | void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, | |
9e630bcb AR |
568 | struct rds_sock *rs, u32 *key_ret, |
569 | struct rds_connection *conn); | |
39de8281 AG |
570 | void (*sync_mr)(void *trans_private, int direction); |
571 | void (*free_mr)(void *trans_private, int invalidate); | |
572 | void (*flush_mrs)(void); | |
ebeeb1ad | 573 | bool (*t_unloading)(struct rds_connection *conn); |
39de8281 AG |
574 | }; |
575 | ||
eee2fa6a KCP |
576 | /* Bind hash table key length. It is the sum of the size of a struct |
577 | * in6_addr, a scope_id and a port. | |
578 | */ | |
579 | #define RDS_BOUND_KEY_LEN \ | |
580 | (sizeof(struct in6_addr) + sizeof(__u32) + sizeof(__be16)) | |
581 | ||
39de8281 AG |
582 | struct rds_sock { |
583 | struct sock rs_sk; | |
584 | ||
585 | u64 rs_user_addr; | |
586 | u64 rs_user_bytes; | |
587 | ||
588 | /* | |
589 | * bound_addr used for both incoming and outgoing, no INADDR_ANY | |
590 | * support. | |
591 | */ | |
7b565434 | 592 | struct rhash_head rs_bound_node; |
eee2fa6a KCP |
593 | u8 rs_bound_key[RDS_BOUND_KEY_LEN]; |
594 | struct sockaddr_in6 rs_bound_sin6; | |
595 | #define rs_bound_addr rs_bound_sin6.sin6_addr | |
596 | #define rs_bound_addr_v4 rs_bound_sin6.sin6_addr.s6_addr32[3] | |
597 | #define rs_bound_port rs_bound_sin6.sin6_port | |
598 | #define rs_bound_scope_id rs_bound_sin6.sin6_scope_id | |
599 | struct in6_addr rs_conn_addr; | |
600 | #define rs_conn_addr_v4 rs_conn_addr.s6_addr32[3] | |
39de8281 | 601 | __be16 rs_conn_port; |
39de8281 AG |
602 | struct rds_transport *rs_transport; |
603 | ||
604 | /* | |
605 | * rds_sendmsg caches the conn it used the last time around. | |
606 | * This helps avoid costly lookups. | |
607 | */ | |
608 | struct rds_connection *rs_conn; | |
609 | ||
610 | /* flag indicating we were congested or not */ | |
611 | int rs_congested; | |
b98ba52f AG |
612 | /* seen congestion (ENOBUFS) when sending? */ |
613 | int rs_seen_congestion; | |
39de8281 AG |
614 | |
615 | /* rs_lock protects all these adjacent members before the newline */ | |
616 | spinlock_t rs_lock; | |
617 | struct list_head rs_send_queue; | |
618 | u32 rs_snd_bytes; | |
619 | int rs_rcv_bytes; | |
620 | struct list_head rs_notify_queue; /* currently used for failed RDMAs */ | |
621 | ||
622 | /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask | |
623 | * to decide whether the application should be woken up. | |
624 | * If not set, we use rs_cong_track to find out whether a cong map | |
625 | * update arrived. | |
626 | */ | |
627 | uint64_t rs_cong_mask; | |
628 | uint64_t rs_cong_notify; | |
629 | struct list_head rs_cong_list; | |
630 | unsigned long rs_cong_track; | |
631 | ||
632 | /* | |
633 | * rs_recv_lock protects the receive queue, and is | |
634 | * used to serialize with rds_release. | |
635 | */ | |
636 | rwlock_t rs_recv_lock; | |
637 | struct list_head rs_recv_queue; | |
638 | ||
639 | /* just for stats reporting */ | |
640 | struct list_head rs_item; | |
641 | ||
642 | /* these have their own lock */ | |
643 | spinlock_t rs_rdma_lock; | |
644 | struct rb_root rs_rdma_keys; | |
645 | ||
646 | /* Socket options - in case there will be more */ | |
647 | unsigned char rs_recverr, | |
648 | rs_cong_monitor; | |
5916e2c1 | 649 | u32 rs_hash_initval; |
3289025a SS |
650 | |
651 | /* Socket receive path trace points*/ | |
652 | u8 rs_rx_traces; | |
653 | u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; | |
9426bbc6 | 654 | struct rds_msg_zcopy_queue rs_zcookie_queue; |
39de8281 AG |
655 | }; |
656 | ||
657 | static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) | |
658 | { | |
659 | return container_of(sk, struct rds_sock, rs_sk); | |
660 | } | |
661 | static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) | |
662 | { | |
663 | return &rs->rs_sk; | |
664 | } | |
665 | ||
666 | /* | |
667 | * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value | |
668 | * to account for overhead. We don't account for overhead, we just apply | |
669 | * the number of payload bytes to the specified value. | |
670 | */ | |
671 | static inline int rds_sk_sndbuf(struct rds_sock *rs) | |
672 | { | |
673 | return rds_rs_to_sk(rs)->sk_sndbuf / 2; | |
674 | } | |
675 | static inline int rds_sk_rcvbuf(struct rds_sock *rs) | |
676 | { | |
677 | return rds_rs_to_sk(rs)->sk_rcvbuf / 2; | |
678 | } | |
679 | ||
680 | struct rds_statistics { | |
681 | uint64_t s_conn_reset; | |
682 | uint64_t s_recv_drop_bad_checksum; | |
683 | uint64_t s_recv_drop_old_seq; | |
684 | uint64_t s_recv_drop_no_sock; | |
685 | uint64_t s_recv_drop_dead_sock; | |
686 | uint64_t s_recv_deliver_raced; | |
687 | uint64_t s_recv_delivered; | |
688 | uint64_t s_recv_queued; | |
689 | uint64_t s_recv_immediate_retry; | |
690 | uint64_t s_recv_delayed_retry; | |
691 | uint64_t s_recv_ack_required; | |
692 | uint64_t s_recv_rdma_bytes; | |
693 | uint64_t s_recv_ping; | |
694 | uint64_t s_send_queue_empty; | |
695 | uint64_t s_send_queue_full; | |
049ee3f5 AG |
696 | uint64_t s_send_lock_contention; |
697 | uint64_t s_send_lock_queue_raced; | |
39de8281 AG |
698 | uint64_t s_send_immediate_retry; |
699 | uint64_t s_send_delayed_retry; | |
700 | uint64_t s_send_drop_acked; | |
701 | uint64_t s_send_ack_required; | |
702 | uint64_t s_send_queued; | |
703 | uint64_t s_send_rdma; | |
704 | uint64_t s_send_rdma_bytes; | |
705 | uint64_t s_send_pong; | |
706 | uint64_t s_page_remainder_hit; | |
707 | uint64_t s_page_remainder_miss; | |
708 | uint64_t s_copy_to_user; | |
709 | uint64_t s_copy_from_user; | |
710 | uint64_t s_cong_update_queued; | |
711 | uint64_t s_cong_update_received; | |
712 | uint64_t s_cong_send_error; | |
713 | uint64_t s_cong_send_blocked; | |
192a798f VV |
714 | uint64_t s_recv_bytes_added_to_socket; |
715 | uint64_t s_recv_bytes_removed_from_socket; | |
716 | ||
39de8281 AG |
717 | }; |
718 | ||
719 | /* af_rds.c */ | |
720 | void rds_sock_addref(struct rds_sock *rs); | |
721 | void rds_sock_put(struct rds_sock *rs); | |
722 | void rds_wake_sk_sleep(struct rds_sock *rs); | |
723 | static inline void __rds_wake_sk_sleep(struct sock *sk) | |
724 | { | |
aa395145 | 725 | wait_queue_head_t *waitq = sk_sleep(sk); |
39de8281 AG |
726 | |
727 | if (!sock_flag(sk, SOCK_DEAD) && waitq) | |
728 | wake_up(waitq); | |
729 | } | |
730 | extern wait_queue_head_t rds_poll_waitq; | |
731 | ||
732 | ||
733 | /* bind.c */ | |
734 | int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); | |
735 | void rds_remove_bound(struct rds_sock *rs); | |
eee2fa6a KCP |
736 | struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port, |
737 | __u32 scope_id); | |
7b565434 | 738 | int rds_bind_lock_init(void); |
739 | void rds_bind_lock_destroy(void); | |
39de8281 AG |
740 | |
741 | /* cong.c */ | |
742 | int rds_cong_get_maps(struct rds_connection *conn); | |
743 | void rds_cong_add_conn(struct rds_connection *conn); | |
744 | void rds_cong_remove_conn(struct rds_connection *conn); | |
745 | void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); | |
746 | void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); | |
747 | int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); | |
748 | void rds_cong_queue_updates(struct rds_cong_map *map); | |
749 | void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); | |
750 | int rds_cong_updated_since(unsigned long *recent); | |
751 | void rds_cong_add_socket(struct rds_sock *); | |
752 | void rds_cong_remove_socket(struct rds_sock *); | |
753 | void rds_cong_exit(void); | |
754 | struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); | |
755 | ||
1e2b44e7 | 756 | /* connection.c */ |
905dd418 | 757 | extern u32 rds_gen_num; |
ef87b7ea | 758 | int rds_conn_init(void); |
39de8281 | 759 | void rds_conn_exit(void); |
d5a8ac28 | 760 | struct rds_connection *rds_conn_create(struct net *net, |
eee2fa6a KCP |
761 | const struct in6_addr *laddr, |
762 | const struct in6_addr *faddr, | |
763 | struct rds_transport *trans, gfp_t gfp, | |
764 | int dev_if); | |
d5a8ac28 | 765 | struct rds_connection *rds_conn_create_outgoing(struct net *net, |
eee2fa6a KCP |
766 | const struct in6_addr *laddr, |
767 | const struct in6_addr *faddr, | |
768 | struct rds_transport *trans, | |
769 | gfp_t gfp, int dev_if); | |
d769ef81 | 770 | void rds_conn_shutdown(struct rds_conn_path *cpath); |
39de8281 | 771 | void rds_conn_destroy(struct rds_connection *conn); |
39de8281 | 772 | void rds_conn_drop(struct rds_connection *conn); |
aed20a53 | 773 | void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy); |
f3c6808d | 774 | void rds_conn_connect_if_down(struct rds_connection *conn); |
3c0a5900 | 775 | void rds_conn_path_connect_if_down(struct rds_conn_path *cp); |
39de8281 AG |
776 | void rds_for_each_conn_info(struct socket *sock, unsigned int len, |
777 | struct rds_info_iterator *iter, | |
778 | struct rds_info_lengths *lens, | |
779 | int (*visitor)(struct rds_connection *, void *), | |
f1cb9d68 | 780 | u64 *buffer, |
39de8281 | 781 | size_t item_len); |
39de8281 | 782 | |
6cdaf03f | 783 | __printf(2, 3) |
fb1b3dc4 SV |
784 | void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); |
785 | #define rds_conn_path_error(cp, fmt...) \ | |
786 | __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) | |
787 | ||
0cb43965 SV |
788 | static inline int |
789 | rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) | |
790 | { | |
791 | return atomic_cmpxchg(&cp->cp_state, old, new) == old; | |
792 | } | |
793 | ||
39de8281 AG |
794 | static inline int |
795 | rds_conn_transition(struct rds_connection *conn, int old, int new) | |
796 | { | |
7e8f4413 | 797 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
798 | return rds_conn_path_transition(&conn->c_path[0], old, new); |
799 | } | |
800 | ||
801 | static inline int | |
802 | rds_conn_path_state(struct rds_conn_path *cp) | |
803 | { | |
804 | return atomic_read(&cp->cp_state); | |
39de8281 AG |
805 | } |
806 | ||
807 | static inline int | |
808 | rds_conn_state(struct rds_connection *conn) | |
809 | { | |
7e8f4413 | 810 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
811 | return rds_conn_path_state(&conn->c_path[0]); |
812 | } | |
813 | ||
814 | static inline int | |
815 | rds_conn_path_up(struct rds_conn_path *cp) | |
816 | { | |
817 | return atomic_read(&cp->cp_state) == RDS_CONN_UP; | |
39de8281 AG |
818 | } |
819 | ||
820 | static inline int | |
821 | rds_conn_up(struct rds_connection *conn) | |
822 | { | |
7e8f4413 | 823 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
824 | return rds_conn_path_up(&conn->c_path[0]); |
825 | } | |
826 | ||
827 | static inline int | |
828 | rds_conn_path_connecting(struct rds_conn_path *cp) | |
829 | { | |
830 | return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; | |
39de8281 AG |
831 | } |
832 | ||
833 | static inline int | |
834 | rds_conn_connecting(struct rds_connection *conn) | |
835 | { | |
7e8f4413 | 836 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 | 837 | return rds_conn_path_connecting(&conn->c_path[0]); |
39de8281 AG |
838 | } |
839 | ||
840 | /* message.c */ | |
841 | struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); | |
c75ab8a5 | 842 | struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents, |
843 | int *ret); | |
0cebacce SV |
844 | int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, |
845 | bool zcopy); | |
39de8281 AG |
846 | struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); |
847 | void rds_message_populate_header(struct rds_header *hdr, __be16 sport, | |
848 | __be16 dport, u64 seq); | |
849 | int rds_message_add_extension(struct rds_header *hdr, | |
850 | unsigned int type, const void *data, unsigned int len); | |
851 | int rds_message_next_extension(struct rds_header *hdr, | |
852 | unsigned int *pos, void *buf, unsigned int *buflen); | |
39de8281 | 853 | int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); |
c310e72c | 854 | int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
855 | void rds_message_inc_free(struct rds_incoming *inc); |
856 | void rds_message_addref(struct rds_message *rm); | |
857 | void rds_message_put(struct rds_message *rm); | |
858 | void rds_message_wait(struct rds_message *rm); | |
859 | void rds_message_unmapped(struct rds_message *rm); | |
9426bbc6 | 860 | void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info); |
39de8281 AG |
861 | |
862 | static inline void rds_message_make_checksum(struct rds_header *hdr) | |
863 | { | |
864 | hdr->h_csum = 0; | |
865 | hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); | |
866 | } | |
867 | ||
868 | static inline int rds_message_verify_checksum(const struct rds_header *hdr) | |
869 | { | |
870 | return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; | |
871 | } | |
872 | ||
873 | ||
874 | /* page.c */ | |
875 | int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, | |
876 | gfp_t gfp); | |
39de8281 AG |
877 | void rds_page_exit(void); |
878 | ||
879 | /* recv.c */ | |
880 | void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, | |
eee2fa6a | 881 | struct in6_addr *saddr); |
5e833e02 | 882 | void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, |
eee2fa6a | 883 | struct in6_addr *saddr); |
39de8281 | 884 | void rds_inc_put(struct rds_incoming *inc); |
eee2fa6a KCP |
885 | void rds_recv_incoming(struct rds_connection *conn, struct in6_addr *saddr, |
886 | struct in6_addr *daddr, | |
6114eab5 | 887 | struct rds_incoming *inc, gfp_t gfp); |
1b784140 YX |
888 | int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
889 | int msg_flags); | |
39de8281 AG |
890 | void rds_clear_recv_queue(struct rds_sock *rs); |
891 | int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); | |
892 | void rds_inc_info_copy(struct rds_incoming *inc, | |
893 | struct rds_info_iterator *iter, | |
894 | __be32 saddr, __be32 daddr, int flip); | |
1e2b44e7 KCP |
895 | void rds6_inc_info_copy(struct rds_incoming *inc, |
896 | struct rds_info_iterator *iter, | |
897 | struct in6_addr *saddr, struct in6_addr *daddr, | |
898 | int flip); | |
39de8281 AG |
899 | |
900 | /* send.c */ | |
1b784140 | 901 | int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); |
d769ef81 | 902 | void rds_send_path_reset(struct rds_conn_path *conn); |
1f9ecd7e | 903 | int rds_send_xmit(struct rds_conn_path *cp); |
39de8281 | 904 | struct sockaddr_in; |
eee2fa6a | 905 | void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in6 *dest); |
39de8281 AG |
906 | typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); |
907 | void rds_send_drop_acked(struct rds_connection *conn, u64 ack, | |
908 | is_acked_func is_acked); | |
5c3d274c SV |
909 | void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, |
910 | is_acked_func is_acked); | |
69b92b5b | 911 | void rds_send_ping(struct rds_connection *conn, int cp_index); |
45997e9e | 912 | int rds_send_pong(struct rds_conn_path *cp, __be16 dport); |
39de8281 AG |
913 | |
914 | /* rdma.c */ | |
915 | void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); | |
21f79afa AG |
916 | int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); |
917 | int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); | |
918 | int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); | |
919 | void rds_rdma_drop_keys(struct rds_sock *rs); | |
ea010070 | 920 | int rds_rdma_extra_size(struct rds_rdma_args *args, |
921 | struct rds_iov_vector *iov); | |
21f79afa AG |
922 | int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, |
923 | struct cmsghdr *cmsg); | |
924 | int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, | |
ea010070 | 925 | struct cmsghdr *cmsg, |
926 | struct rds_iov_vector *vec); | |
21f79afa AG |
927 | int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, |
928 | struct cmsghdr *cmsg); | |
f8b3aaf2 | 929 | void rds_rdma_free_op(struct rm_rdma_op *ro); |
d0ab25a8 | 930 | void rds_atomic_free_op(struct rm_atomic_op *ao); |
15133f6e AG |
931 | void rds_rdma_send_complete(struct rds_message *rm, int wc_status); |
932 | void rds_atomic_send_complete(struct rds_message *rm, int wc_status); | |
933 | int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, | |
934 | struct cmsghdr *cmsg); | |
21f79afa | 935 | |
c1b1203d | 936 | void __rds_put_mr_final(struct rds_mr *mr); |
21f79afa AG |
937 | static inline void rds_mr_put(struct rds_mr *mr) |
938 | { | |
803ea850 | 939 | if (refcount_dec_and_test(&mr->r_refcount)) |
21f79afa AG |
940 | __rds_put_mr_final(mr); |
941 | } | |
39de8281 | 942 | |
ebeeb1ad SV |
943 | static inline bool rds_destroy_pending(struct rds_connection *conn) |
944 | { | |
945 | return !check_net(rds_conn_net(conn)) || | |
946 | (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn)); | |
947 | } | |
948 | ||
39de8281 | 949 | /* stats.c */ |
9b8de747 | 950 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); |
39de8281 AG |
951 | #define rds_stats_inc_which(which, member) do { \ |
952 | per_cpu(which, get_cpu()).member++; \ | |
953 | put_cpu(); \ | |
954 | } while (0) | |
955 | #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) | |
956 | #define rds_stats_add_which(which, member, count) do { \ | |
957 | per_cpu(which, get_cpu()).member += count; \ | |
958 | put_cpu(); \ | |
959 | } while (0) | |
960 | #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) | |
ef87b7ea | 961 | int rds_stats_init(void); |
39de8281 AG |
962 | void rds_stats_exit(void); |
963 | void rds_stats_info_copy(struct rds_info_iterator *iter, | |
36cbd3dc JE |
964 | uint64_t *values, const char *const *names, |
965 | size_t nr); | |
39de8281 AG |
966 | |
967 | /* sysctl.c */ | |
ef87b7ea | 968 | int rds_sysctl_init(void); |
39de8281 AG |
969 | void rds_sysctl_exit(void); |
970 | extern unsigned long rds_sysctl_sndbuf_min; | |
971 | extern unsigned long rds_sysctl_sndbuf_default; | |
972 | extern unsigned long rds_sysctl_sndbuf_max; | |
973 | extern unsigned long rds_sysctl_reconnect_min_jiffies; | |
974 | extern unsigned long rds_sysctl_reconnect_max_jiffies; | |
975 | extern unsigned int rds_sysctl_max_unacked_packets; | |
976 | extern unsigned int rds_sysctl_max_unacked_bytes; | |
977 | extern unsigned int rds_sysctl_ping_enable; | |
978 | extern unsigned long rds_sysctl_trace_flags; | |
979 | extern unsigned int rds_sysctl_trace_level; | |
980 | ||
981 | /* threads.c */ | |
ef87b7ea | 982 | int rds_threads_init(void); |
39de8281 AG |
983 | void rds_threads_exit(void); |
984 | extern struct workqueue_struct *rds_wq; | |
0cb43965 | 985 | void rds_queue_reconnect(struct rds_conn_path *cp); |
39de8281 AG |
986 | void rds_connect_worker(struct work_struct *); |
987 | void rds_shutdown_worker(struct work_struct *); | |
988 | void rds_send_worker(struct work_struct *); | |
989 | void rds_recv_worker(struct work_struct *); | |
0cb43965 | 990 | void rds_connect_path_complete(struct rds_conn_path *conn, int curr); |
39de8281 | 991 | void rds_connect_complete(struct rds_connection *conn); |
eee2fa6a | 992 | int rds_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2); |
39de8281 AG |
993 | |
994 | /* transport.c */ | |
a8d63a53 | 995 | void rds_trans_register(struct rds_transport *trans); |
39de8281 | 996 | void rds_trans_unregister(struct rds_transport *trans); |
eee2fa6a KCP |
997 | struct rds_transport *rds_trans_get_preferred(struct net *net, |
998 | const struct in6_addr *addr, | |
999 | __u32 scope_id); | |
5adb5bc6 | 1000 | void rds_trans_put(struct rds_transport *trans); |
39de8281 AG |
1001 | unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, |
1002 | unsigned int avail); | |
d97dac54 | 1003 | struct rds_transport *rds_trans_get(int t_type); |
ef87b7ea | 1004 | int rds_trans_init(void); |
39de8281 AG |
1005 | void rds_trans_exit(void); |
1006 | ||
1007 | #endif |