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39de8281 AG |
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> |
b7f02920 | 11 | #include <linux/refcount.h> |
39de8281 AG |
12 | |
13 | #include "info.h" | |
14 | ||
15 | /* | |
16 | * RDS Network protocol version | |
17 | */ | |
18 | #define RDS_PROTOCOL_3_0 0x0300 | |
19 | #define RDS_PROTOCOL_3_1 0x0301 | |
20 | #define RDS_PROTOCOL_VERSION RDS_PROTOCOL_3_1 | |
21 | #define RDS_PROTOCOL_MAJOR(v) ((v) >> 8) | |
22 | #define RDS_PROTOCOL_MINOR(v) ((v) & 255) | |
23 | #define RDS_PROTOCOL(maj, min) (((maj) << 8) | min) | |
24 | ||
25 | /* | |
26 | * XXX randomly chosen, but at least seems to be unused: | |
27 | * # 18464-18768 Unassigned | |
28 | * We should do better. We want a reserved port to discourage unpriv'ed | |
29 | * userspace from listening. | |
30 | */ | |
31 | #define RDS_PORT 18634 | |
32 | ||
8cbd9606 AG |
33 | #ifdef ATOMIC64_INIT |
34 | #define KERNEL_HAS_ATOMIC64 | |
35 | #endif | |
36 | ||
ff57087f | 37 | #ifdef RDS_DEBUG |
39de8281 AG |
38 | #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args) |
39 | #else | |
40 | /* sigh, pr_debug() causes unused variable warnings */ | |
b9075fa9 JP |
41 | static inline __printf(1, 2) |
42 | void rdsdebug(char *fmt, ...) | |
39de8281 AG |
43 | { |
44 | } | |
45 | #endif | |
46 | ||
47 | /* XXX is there one of these somewhere? */ | |
48 | #define ceil(x, y) \ | |
49 | ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; }) | |
50 | ||
51 | #define RDS_FRAG_SHIFT 12 | |
52 | #define RDS_FRAG_SIZE ((unsigned int)(1 << RDS_FRAG_SHIFT)) | |
53 | ||
f9fb69ad AR |
54 | /* Used to limit both RDMA and non-RDMA RDS message to 1MB */ |
55 | #define RDS_MAX_MSG_SIZE ((unsigned int)(1 << 20)) | |
56 | ||
39de8281 | 57 | #define RDS_CONG_MAP_BYTES (65536 / 8) |
39de8281 AG |
58 | #define RDS_CONG_MAP_PAGES (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE) |
59 | #define RDS_CONG_MAP_PAGE_BITS (PAGE_SIZE * 8) | |
60 | ||
61 | struct rds_cong_map { | |
62 | struct rb_node m_rb_node; | |
63 | __be32 m_addr; | |
64 | wait_queue_head_t m_waitq; | |
65 | struct list_head m_conn_list; | |
66 | unsigned long m_page_addrs[RDS_CONG_MAP_PAGES]; | |
67 | }; | |
68 | ||
69 | ||
70 | /* | |
71 | * This is how we will track the connection state: | |
72 | * A connection is always in one of the following | |
73 | * states. Updates to the state are atomic and imply | |
74 | * a memory barrier. | |
75 | */ | |
76 | enum { | |
77 | RDS_CONN_DOWN = 0, | |
78 | RDS_CONN_CONNECTING, | |
79 | RDS_CONN_DISCONNECTING, | |
80 | RDS_CONN_UP, | |
9c79440e | 81 | RDS_CONN_RESETTING, |
39de8281 AG |
82 | RDS_CONN_ERROR, |
83 | }; | |
84 | ||
85 | /* Bits for c_flags */ | |
86 | #define RDS_LL_SEND_FULL 0 | |
87 | #define RDS_RECONNECT_PENDING 1 | |
0f4b1c7e | 88 | #define RDS_IN_XMIT 2 |
73ce4317 | 89 | #define RDS_RECV_REFILL 3 |
39de8281 | 90 | |
0cb43965 | 91 | /* Max number of multipaths per RDS connection. Must be a power of 2 */ |
5916e2c1 SV |
92 | #define RDS_MPATH_WORKERS 8 |
93 | #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \ | |
94 | (rs)->rs_hash_initval) & ((n) - 1)) | |
0cb43965 | 95 | |
00354de5 SV |
96 | #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr)) |
97 | ||
0cb43965 SV |
98 | /* Per mpath connection state */ |
99 | struct rds_conn_path { | |
100 | struct rds_connection *cp_conn; | |
101 | struct rds_message *cp_xmit_rm; | |
102 | unsigned long cp_xmit_sg; | |
103 | unsigned int cp_xmit_hdr_off; | |
104 | unsigned int cp_xmit_data_off; | |
105 | unsigned int cp_xmit_atomic_sent; | |
106 | unsigned int cp_xmit_rdma_sent; | |
107 | unsigned int cp_xmit_data_sent; | |
108 | ||
109 | spinlock_t cp_lock; /* protect msg queues */ | |
110 | u64 cp_next_tx_seq; | |
111 | struct list_head cp_send_queue; | |
112 | struct list_head cp_retrans; | |
113 | ||
114 | u64 cp_next_rx_seq; | |
115 | ||
116 | void *cp_transport_data; | |
117 | ||
118 | atomic_t cp_state; | |
119 | unsigned long cp_send_gen; | |
120 | unsigned long cp_flags; | |
121 | unsigned long cp_reconnect_jiffies; | |
122 | struct delayed_work cp_send_w; | |
123 | struct delayed_work cp_recv_w; | |
124 | struct delayed_work cp_conn_w; | |
125 | struct work_struct cp_down_w; | |
126 | struct mutex cp_cm_lock; /* protect cp_state & cm */ | |
127 | wait_queue_head_t cp_waitq; | |
128 | ||
129 | unsigned int cp_unacked_packets; | |
130 | unsigned int cp_unacked_bytes; | |
0cb43965 SV |
131 | unsigned int cp_index; |
132 | }; | |
133 | ||
134 | /* One rds_connection per RDS address pair */ | |
39de8281 AG |
135 | struct rds_connection { |
136 | struct hlist_node c_hash_node; | |
137 | __be32 c_laddr; | |
138 | __be32 c_faddr; | |
3b20fc38 | 139 | unsigned int c_loopback:1, |
5916e2c1 | 140 | c_ping_triggered:1, |
c14b0366 SV |
141 | c_destroy_in_prog:1, |
142 | c_pad_to_32:29; | |
0cb43965 | 143 | int c_npaths; |
39de8281 | 144 | struct rds_connection *c_passive; |
0cb43965 | 145 | struct rds_transport *c_trans; |
39de8281 AG |
146 | |
147 | struct rds_cong_map *c_lcong; | |
148 | struct rds_cong_map *c_fcong; | |
149 | ||
0cb43965 SV |
150 | /* Protocol version */ |
151 | unsigned int c_version; | |
8edc3aff | 152 | struct net *c_net; |
39de8281 AG |
153 | |
154 | struct list_head c_map_item; | |
155 | unsigned long c_map_queued; | |
39de8281 | 156 | |
0cb43965 | 157 | struct rds_conn_path c_path[RDS_MPATH_WORKERS]; |
5916e2c1 | 158 | wait_queue_head_t c_hs_waitq; /* handshake waitq */ |
905dd418 SV |
159 | |
160 | u32 c_my_gen_num; | |
161 | u32 c_peer_gen_num; | |
39de8281 AG |
162 | }; |
163 | ||
d5a8ac28 SV |
164 | static inline |
165 | struct net *rds_conn_net(struct rds_connection *conn) | |
166 | { | |
8edc3aff | 167 | return conn->c_net; |
d5a8ac28 SV |
168 | } |
169 | ||
170 | static inline | |
171 | void rds_conn_net_set(struct rds_connection *conn, struct net *net) | |
172 | { | |
8edc3aff | 173 | conn->c_net = get_net(net); |
d5a8ac28 SV |
174 | } |
175 | ||
39de8281 AG |
176 | #define RDS_FLAG_CONG_BITMAP 0x01 |
177 | #define RDS_FLAG_ACK_REQUIRED 0x02 | |
178 | #define RDS_FLAG_RETRANSMITTED 0x04 | |
7b70d033 | 179 | #define RDS_MAX_ADV_CREDIT 255 |
39de8281 | 180 | |
5916e2c1 SV |
181 | /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping |
182 | * probe to exchange control information before establishing a connection. | |
183 | * Currently the control information that is exchanged is the number of | |
184 | * supported paths. If the peer is a legacy (older kernel revision) peer, | |
185 | * it would return a pong message without additional control information | |
186 | * that would then alert the sender that the peer was an older rev. | |
187 | */ | |
188 | #define RDS_FLAG_PROBE_PORT 1 | |
189 | #define RDS_HS_PROBE(sport, dport) \ | |
190 | ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \ | |
191 | (sport == 0 && dport == RDS_FLAG_PROBE_PORT)) | |
39de8281 AG |
192 | /* |
193 | * Maximum space available for extension headers. | |
194 | */ | |
195 | #define RDS_HEADER_EXT_SPACE 16 | |
196 | ||
197 | struct rds_header { | |
198 | __be64 h_sequence; | |
199 | __be64 h_ack; | |
200 | __be32 h_len; | |
201 | __be16 h_sport; | |
202 | __be16 h_dport; | |
203 | u8 h_flags; | |
204 | u8 h_credit; | |
205 | u8 h_padding[4]; | |
206 | __sum16 h_csum; | |
207 | ||
208 | u8 h_exthdr[RDS_HEADER_EXT_SPACE]; | |
209 | }; | |
210 | ||
211 | /* | |
212 | * Reserved - indicates end of extensions | |
213 | */ | |
214 | #define RDS_EXTHDR_NONE 0 | |
215 | ||
216 | /* | |
217 | * This extension header is included in the very | |
218 | * first message that is sent on a new connection, | |
219 | * and identifies the protocol level. This will help | |
220 | * rolling updates if a future change requires breaking | |
221 | * the protocol. | |
222 | * NB: This is no longer true for IB, where we do a version | |
223 | * negotiation during the connection setup phase (protocol | |
224 | * version information is included in the RDMA CM private data). | |
225 | */ | |
226 | #define RDS_EXTHDR_VERSION 1 | |
227 | struct rds_ext_header_version { | |
228 | __be32 h_version; | |
229 | }; | |
230 | ||
231 | /* | |
232 | * This extension header is included in the RDS message | |
233 | * chasing an RDMA operation. | |
234 | */ | |
235 | #define RDS_EXTHDR_RDMA 2 | |
236 | struct rds_ext_header_rdma { | |
237 | __be32 h_rdma_rkey; | |
238 | }; | |
239 | ||
240 | /* | |
241 | * This extension header tells the peer about the | |
242 | * destination <R_Key,offset> of the requested RDMA | |
243 | * operation. | |
244 | */ | |
245 | #define RDS_EXTHDR_RDMA_DEST 3 | |
246 | struct rds_ext_header_rdma_dest { | |
247 | __be32 h_rdma_rkey; | |
248 | __be32 h_rdma_offset; | |
249 | }; | |
250 | ||
5916e2c1 SV |
251 | /* Extension header announcing number of paths. |
252 | * Implicit length = 2 bytes. | |
253 | */ | |
905dd418 SV |
254 | #define RDS_EXTHDR_NPATHS 5 |
255 | #define RDS_EXTHDR_GEN_NUM 6 | |
5916e2c1 | 256 | |
39de8281 | 257 | #define __RDS_EXTHDR_MAX 16 /* for now */ |
3289025a SS |
258 | #define RDS_RX_MAX_TRACES (RDS_MSG_RX_DGRAM_TRACE_MAX + 1) |
259 | #define RDS_MSG_RX_HDR 0 | |
260 | #define RDS_MSG_RX_START 1 | |
261 | #define RDS_MSG_RX_END 2 | |
262 | #define RDS_MSG_RX_CMSG 3 | |
39de8281 AG |
263 | |
264 | struct rds_incoming { | |
b7f02920 | 265 | refcount_t i_refcount; |
39de8281 AG |
266 | struct list_head i_item; |
267 | struct rds_connection *i_conn; | |
ef9e62c2 | 268 | struct rds_conn_path *i_conn_path; |
39de8281 AG |
269 | struct rds_header i_hdr; |
270 | unsigned long i_rx_jiffies; | |
271 | __be32 i_saddr; | |
272 | ||
273 | rds_rdma_cookie_t i_rdma_cookie; | |
5711f8b3 | 274 | struct timeval i_rx_tstamp; |
3289025a | 275 | u64 i_rx_lat_trace[RDS_RX_MAX_TRACES]; |
39de8281 AG |
276 | }; |
277 | ||
21f79afa AG |
278 | struct rds_mr { |
279 | struct rb_node r_rb_node; | |
803ea850 | 280 | refcount_t r_refcount; |
21f79afa AG |
281 | u32 r_key; |
282 | ||
283 | /* A copy of the creation flags */ | |
284 | unsigned int r_use_once:1; | |
285 | unsigned int r_invalidate:1; | |
286 | unsigned int r_write:1; | |
287 | ||
288 | /* This is for RDS_MR_DEAD. | |
289 | * It would be nice & consistent to make this part of the above | |
290 | * bit field here, but we need to use test_and_set_bit. | |
291 | */ | |
292 | unsigned long r_state; | |
293 | struct rds_sock *r_sock; /* back pointer to the socket that owns us */ | |
294 | struct rds_transport *r_trans; | |
295 | void *r_trans_private; | |
296 | }; | |
297 | ||
298 | /* Flags for mr->r_state */ | |
299 | #define RDS_MR_DEAD 0 | |
300 | ||
21f79afa AG |
301 | static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset) |
302 | { | |
303 | return r_key | (((u64) offset) << 32); | |
304 | } | |
305 | ||
306 | static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie) | |
307 | { | |
308 | return cookie; | |
309 | } | |
310 | ||
311 | static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie) | |
312 | { | |
313 | return cookie >> 32; | |
314 | } | |
315 | ||
15133f6e AG |
316 | /* atomic operation types */ |
317 | #define RDS_ATOMIC_TYPE_CSWP 0 | |
318 | #define RDS_ATOMIC_TYPE_FADD 1 | |
319 | ||
39de8281 AG |
320 | /* |
321 | * m_sock_item and m_conn_item are on lists that are serialized under | |
322 | * conn->c_lock. m_sock_item has additional meaning in that once it is empty | |
323 | * the message will not be put back on the retransmit list after being sent. | |
324 | * messages that are canceled while being sent rely on this. | |
325 | * | |
326 | * m_inc is used by loopback so that it can pass an incoming message straight | |
327 | * back up into the rx path. It embeds a wire header which is also used by | |
328 | * the send path, which is kind of awkward. | |
329 | * | |
330 | * m_sock_item indicates the message's presence on a socket's send or receive | |
331 | * queue. m_rs will point to that socket. | |
332 | * | |
333 | * m_daddr is used by cancellation to prune messages to a given destination. | |
334 | * | |
335 | * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock | |
336 | * nesting. As paths iterate over messages on a sock, or conn, they must | |
337 | * also lock the conn, or sock, to remove the message from those lists too. | |
338 | * Testing the flag to determine if the message is still on the lists lets | |
339 | * us avoid testing the list_head directly. That means each path can use | |
340 | * the message's list_head to keep it on a local list while juggling locks | |
341 | * without confusing the other path. | |
342 | * | |
343 | * m_ack_seq is an optional field set by transports who need a different | |
344 | * sequence number range to invalidate. They can use this in a callback | |
345 | * that they pass to rds_send_drop_acked() to see if each message has been | |
346 | * acked. The HAS_ACK_SEQ flag can be used to detect messages which haven't | |
347 | * had ack_seq set yet. | |
348 | */ | |
349 | #define RDS_MSG_ON_SOCK 1 | |
350 | #define RDS_MSG_ON_CONN 2 | |
351 | #define RDS_MSG_HAS_ACK_SEQ 3 | |
352 | #define RDS_MSG_ACK_REQUIRED 4 | |
353 | #define RDS_MSG_RETRANSMITTED 5 | |
354 | #define RDS_MSG_MAPPED 6 | |
355 | #define RDS_MSG_PAGEVEC 7 | |
905dd418 | 356 | #define RDS_MSG_FLUSH 8 |
39de8281 AG |
357 | |
358 | struct rds_message { | |
6c5a1c4a | 359 | refcount_t m_refcount; |
39de8281 AG |
360 | struct list_head m_sock_item; |
361 | struct list_head m_conn_item; | |
362 | struct rds_incoming m_inc; | |
363 | u64 m_ack_seq; | |
364 | __be32 m_daddr; | |
365 | unsigned long m_flags; | |
366 | ||
367 | /* Never access m_rs without holding m_rs_lock. | |
368 | * Lock nesting is | |
369 | * rm->m_rs_lock | |
370 | * -> rs->rs_lock | |
371 | */ | |
372 | spinlock_t m_rs_lock; | |
c83188dc CM |
373 | wait_queue_head_t m_flush_wait; |
374 | ||
39de8281 | 375 | struct rds_sock *m_rs; |
7e3bd65e AG |
376 | |
377 | /* cookie to send to remote, in rds header */ | |
39de8281 | 378 | rds_rdma_cookie_t m_rdma_cookie; |
7e3bd65e AG |
379 | |
380 | unsigned int m_used_sgs; | |
381 | unsigned int m_total_sgs; | |
382 | ||
ff3d7d36 AG |
383 | void *m_final_op; |
384 | ||
e779137a | 385 | struct { |
15133f6e AG |
386 | struct rm_atomic_op { |
387 | int op_type; | |
20c72bd5 AG |
388 | union { |
389 | struct { | |
390 | uint64_t compare; | |
391 | uint64_t swap; | |
392 | uint64_t compare_mask; | |
393 | uint64_t swap_mask; | |
394 | } op_m_cswp; | |
395 | struct { | |
396 | uint64_t add; | |
397 | uint64_t nocarry_mask; | |
398 | } op_m_fadd; | |
399 | }; | |
15133f6e AG |
400 | |
401 | u32 op_rkey; | |
402 | u64 op_remote_addr; | |
403 | unsigned int op_notify:1; | |
404 | unsigned int op_recverr:1; | |
405 | unsigned int op_mapped:1; | |
2c3a5f9a | 406 | unsigned int op_silent:1; |
15133f6e | 407 | unsigned int op_active:1; |
15133f6e | 408 | struct scatterlist *op_sg; |
f8b3aaf2 | 409 | struct rds_notifier *op_notifier; |
15133f6e AG |
410 | |
411 | struct rds_mr *op_rdma_mr; | |
412 | } atomic; | |
413 | struct rm_rdma_op { | |
f8b3aaf2 AG |
414 | u32 op_rkey; |
415 | u64 op_remote_addr; | |
416 | unsigned int op_write:1; | |
417 | unsigned int op_fence:1; | |
418 | unsigned int op_notify:1; | |
419 | unsigned int op_recverr:1; | |
420 | unsigned int op_mapped:1; | |
2c3a5f9a | 421 | unsigned int op_silent:1; |
f8b3aaf2 AG |
422 | unsigned int op_active:1; |
423 | unsigned int op_bytes; | |
424 | unsigned int op_nents; | |
425 | unsigned int op_count; | |
426 | struct scatterlist *op_sg; | |
427 | struct rds_notifier *op_notifier; | |
428 | ||
429 | struct rds_mr *op_rdma_mr; | |
e779137a | 430 | } rdma; |
15133f6e | 431 | struct rm_data_op { |
241eef3e | 432 | unsigned int op_active:1; |
941f8d55 | 433 | unsigned int op_notify:1; |
6c7cc6e4 AG |
434 | unsigned int op_nents; |
435 | unsigned int op_count; | |
d655a9fb WW |
436 | unsigned int op_dmasg; |
437 | unsigned int op_dmaoff; | |
6c7cc6e4 | 438 | struct scatterlist *op_sg; |
e779137a AG |
439 | } data; |
440 | }; | |
39de8281 AG |
441 | }; |
442 | ||
443 | /* | |
444 | * The RDS notifier is used (optionally) to tell the application about | |
445 | * completed RDMA operations. Rather than keeping the whole rds message | |
446 | * around on the queue, we allocate a small notifier that is put on the | |
447 | * socket's notifier_list. Notifications are delivered to the application | |
448 | * through control messages. | |
449 | */ | |
450 | struct rds_notifier { | |
451 | struct list_head n_list; | |
452 | uint64_t n_user_token; | |
453 | int n_status; | |
454 | }; | |
455 | ||
456 | /** | |
457 | * struct rds_transport - transport specific behavioural hooks | |
458 | * | |
459 | * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send | |
460 | * part of a message. The caller serializes on the send_sem so this | |
461 | * doesn't need to be reentrant for a given conn. The header must be | |
462 | * sent before the data payload. .xmit must be prepared to send a | |
463 | * message with no data payload. .xmit should return the number of | |
464 | * bytes that were sent down the connection, including header bytes. | |
465 | * Returning 0 tells the caller that it doesn't need to perform any | |
466 | * additional work now. This is usually the case when the transport has | |
467 | * filled the sending queue for its connection and will handle | |
468 | * triggering the rds thread to continue the send when space becomes | |
469 | * available. Returning -EAGAIN tells the caller to retry the send | |
470 | * immediately. Returning -ENOMEM tells the caller to retry the send at | |
471 | * some point in the future. | |
472 | * | |
473 | * @conn_shutdown: conn_shutdown stops traffic on the given connection. Once | |
474 | * it returns the connection can not call rds_recv_incoming(). | |
475 | * This will only be called once after conn_connect returns | |
476 | * non-zero success and will The caller serializes this with | |
477 | * the send and connecting paths (xmit_* and conn_*). The | |
478 | * transport is responsible for other serialization, including | |
479 | * rds_recv_incoming(). This is called in process context but | |
480 | * should try hard not to block. | |
39de8281 AG |
481 | */ |
482 | ||
483 | struct rds_transport { | |
484 | char t_name[TRANSNAMSIZ]; | |
485 | struct list_head t_item; | |
486 | struct module *t_owner; | |
7e8f4413 SV |
487 | unsigned int t_prefer_loopback:1, |
488 | t_mp_capable:1; | |
335776bd | 489 | unsigned int t_type; |
39de8281 | 490 | |
d5a8ac28 | 491 | int (*laddr_check)(struct net *net, __be32 addr); |
39de8281 AG |
492 | int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp); |
493 | void (*conn_free)(void *data); | |
b04e8554 | 494 | int (*conn_path_connect)(struct rds_conn_path *cp); |
d769ef81 | 495 | void (*conn_path_shutdown)(struct rds_conn_path *conn); |
1f9ecd7e | 496 | void (*xmit_path_prepare)(struct rds_conn_path *cp); |
1f9ecd7e | 497 | void (*xmit_path_complete)(struct rds_conn_path *cp); |
39de8281 AG |
498 | int (*xmit)(struct rds_connection *conn, struct rds_message *rm, |
499 | unsigned int hdr_off, unsigned int sg, unsigned int off); | |
f8b3aaf2 | 500 | int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op); |
ff3d7d36 | 501 | int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op); |
2da43c4a | 502 | int (*recv_path)(struct rds_conn_path *cp); |
c310e72c | 503 | int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
504 | void (*inc_free)(struct rds_incoming *inc); |
505 | ||
506 | int (*cm_handle_connect)(struct rdma_cm_id *cm_id, | |
507 | struct rdma_cm_event *event); | |
508 | int (*cm_initiate_connect)(struct rdma_cm_id *cm_id); | |
509 | void (*cm_connect_complete)(struct rds_connection *conn, | |
510 | struct rdma_cm_event *event); | |
511 | ||
512 | unsigned int (*stats_info_copy)(struct rds_info_iterator *iter, | |
513 | unsigned int avail); | |
514 | void (*exit)(void); | |
515 | void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg, | |
516 | struct rds_sock *rs, u32 *key_ret); | |
517 | void (*sync_mr)(void *trans_private, int direction); | |
518 | void (*free_mr)(void *trans_private, int invalidate); | |
519 | void (*flush_mrs)(void); | |
520 | }; | |
521 | ||
522 | struct rds_sock { | |
523 | struct sock rs_sk; | |
524 | ||
525 | u64 rs_user_addr; | |
526 | u64 rs_user_bytes; | |
527 | ||
528 | /* | |
529 | * bound_addr used for both incoming and outgoing, no INADDR_ANY | |
530 | * support. | |
531 | */ | |
7b565434 | 532 | struct rhash_head rs_bound_node; |
533 | u64 rs_bound_key; | |
39de8281 AG |
534 | __be32 rs_bound_addr; |
535 | __be32 rs_conn_addr; | |
536 | __be16 rs_bound_port; | |
537 | __be16 rs_conn_port; | |
39de8281 AG |
538 | struct rds_transport *rs_transport; |
539 | ||
540 | /* | |
541 | * rds_sendmsg caches the conn it used the last time around. | |
542 | * This helps avoid costly lookups. | |
543 | */ | |
544 | struct rds_connection *rs_conn; | |
545 | ||
546 | /* flag indicating we were congested or not */ | |
547 | int rs_congested; | |
b98ba52f AG |
548 | /* seen congestion (ENOBUFS) when sending? */ |
549 | int rs_seen_congestion; | |
39de8281 AG |
550 | |
551 | /* rs_lock protects all these adjacent members before the newline */ | |
552 | spinlock_t rs_lock; | |
553 | struct list_head rs_send_queue; | |
554 | u32 rs_snd_bytes; | |
555 | int rs_rcv_bytes; | |
556 | struct list_head rs_notify_queue; /* currently used for failed RDMAs */ | |
557 | ||
558 | /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask | |
559 | * to decide whether the application should be woken up. | |
560 | * If not set, we use rs_cong_track to find out whether a cong map | |
561 | * update arrived. | |
562 | */ | |
563 | uint64_t rs_cong_mask; | |
564 | uint64_t rs_cong_notify; | |
565 | struct list_head rs_cong_list; | |
566 | unsigned long rs_cong_track; | |
567 | ||
568 | /* | |
569 | * rs_recv_lock protects the receive queue, and is | |
570 | * used to serialize with rds_release. | |
571 | */ | |
572 | rwlock_t rs_recv_lock; | |
573 | struct list_head rs_recv_queue; | |
574 | ||
575 | /* just for stats reporting */ | |
576 | struct list_head rs_item; | |
577 | ||
578 | /* these have their own lock */ | |
579 | spinlock_t rs_rdma_lock; | |
580 | struct rb_root rs_rdma_keys; | |
581 | ||
582 | /* Socket options - in case there will be more */ | |
583 | unsigned char rs_recverr, | |
584 | rs_cong_monitor; | |
5916e2c1 | 585 | u32 rs_hash_initval; |
3289025a SS |
586 | |
587 | /* Socket receive path trace points*/ | |
588 | u8 rs_rx_traces; | |
589 | u8 rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX]; | |
39de8281 AG |
590 | }; |
591 | ||
592 | static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk) | |
593 | { | |
594 | return container_of(sk, struct rds_sock, rs_sk); | |
595 | } | |
596 | static inline struct sock *rds_rs_to_sk(struct rds_sock *rs) | |
597 | { | |
598 | return &rs->rs_sk; | |
599 | } | |
600 | ||
601 | /* | |
602 | * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value | |
603 | * to account for overhead. We don't account for overhead, we just apply | |
604 | * the number of payload bytes to the specified value. | |
605 | */ | |
606 | static inline int rds_sk_sndbuf(struct rds_sock *rs) | |
607 | { | |
608 | return rds_rs_to_sk(rs)->sk_sndbuf / 2; | |
609 | } | |
610 | static inline int rds_sk_rcvbuf(struct rds_sock *rs) | |
611 | { | |
612 | return rds_rs_to_sk(rs)->sk_rcvbuf / 2; | |
613 | } | |
614 | ||
615 | struct rds_statistics { | |
616 | uint64_t s_conn_reset; | |
617 | uint64_t s_recv_drop_bad_checksum; | |
618 | uint64_t s_recv_drop_old_seq; | |
619 | uint64_t s_recv_drop_no_sock; | |
620 | uint64_t s_recv_drop_dead_sock; | |
621 | uint64_t s_recv_deliver_raced; | |
622 | uint64_t s_recv_delivered; | |
623 | uint64_t s_recv_queued; | |
624 | uint64_t s_recv_immediate_retry; | |
625 | uint64_t s_recv_delayed_retry; | |
626 | uint64_t s_recv_ack_required; | |
627 | uint64_t s_recv_rdma_bytes; | |
628 | uint64_t s_recv_ping; | |
629 | uint64_t s_send_queue_empty; | |
630 | uint64_t s_send_queue_full; | |
049ee3f5 AG |
631 | uint64_t s_send_lock_contention; |
632 | uint64_t s_send_lock_queue_raced; | |
39de8281 AG |
633 | uint64_t s_send_immediate_retry; |
634 | uint64_t s_send_delayed_retry; | |
635 | uint64_t s_send_drop_acked; | |
636 | uint64_t s_send_ack_required; | |
637 | uint64_t s_send_queued; | |
638 | uint64_t s_send_rdma; | |
639 | uint64_t s_send_rdma_bytes; | |
640 | uint64_t s_send_pong; | |
641 | uint64_t s_page_remainder_hit; | |
642 | uint64_t s_page_remainder_miss; | |
643 | uint64_t s_copy_to_user; | |
644 | uint64_t s_copy_from_user; | |
645 | uint64_t s_cong_update_queued; | |
646 | uint64_t s_cong_update_received; | |
647 | uint64_t s_cong_send_error; | |
648 | uint64_t s_cong_send_blocked; | |
192a798f VV |
649 | uint64_t s_recv_bytes_added_to_socket; |
650 | uint64_t s_recv_bytes_removed_from_socket; | |
651 | ||
39de8281 AG |
652 | }; |
653 | ||
654 | /* af_rds.c */ | |
655 | void rds_sock_addref(struct rds_sock *rs); | |
656 | void rds_sock_put(struct rds_sock *rs); | |
657 | void rds_wake_sk_sleep(struct rds_sock *rs); | |
658 | static inline void __rds_wake_sk_sleep(struct sock *sk) | |
659 | { | |
aa395145 | 660 | wait_queue_head_t *waitq = sk_sleep(sk); |
39de8281 AG |
661 | |
662 | if (!sock_flag(sk, SOCK_DEAD) && waitq) | |
663 | wake_up(waitq); | |
664 | } | |
665 | extern wait_queue_head_t rds_poll_waitq; | |
666 | ||
667 | ||
668 | /* bind.c */ | |
669 | int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); | |
670 | void rds_remove_bound(struct rds_sock *rs); | |
671 | struct rds_sock *rds_find_bound(__be32 addr, __be16 port); | |
7b565434 | 672 | int rds_bind_lock_init(void); |
673 | void rds_bind_lock_destroy(void); | |
39de8281 AG |
674 | |
675 | /* cong.c */ | |
676 | int rds_cong_get_maps(struct rds_connection *conn); | |
677 | void rds_cong_add_conn(struct rds_connection *conn); | |
678 | void rds_cong_remove_conn(struct rds_connection *conn); | |
679 | void rds_cong_set_bit(struct rds_cong_map *map, __be16 port); | |
680 | void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port); | |
681 | int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs); | |
682 | void rds_cong_queue_updates(struct rds_cong_map *map); | |
683 | void rds_cong_map_updated(struct rds_cong_map *map, uint64_t); | |
684 | int rds_cong_updated_since(unsigned long *recent); | |
685 | void rds_cong_add_socket(struct rds_sock *); | |
686 | void rds_cong_remove_socket(struct rds_sock *); | |
687 | void rds_cong_exit(void); | |
688 | struct rds_message *rds_cong_update_alloc(struct rds_connection *conn); | |
689 | ||
690 | /* conn.c */ | |
905dd418 | 691 | extern u32 rds_gen_num; |
ef87b7ea | 692 | int rds_conn_init(void); |
39de8281 | 693 | void rds_conn_exit(void); |
d5a8ac28 SV |
694 | struct rds_connection *rds_conn_create(struct net *net, |
695 | __be32 laddr, __be32 faddr, | |
39de8281 | 696 | struct rds_transport *trans, gfp_t gfp); |
d5a8ac28 SV |
697 | struct rds_connection *rds_conn_create_outgoing(struct net *net, |
698 | __be32 laddr, __be32 faddr, | |
39de8281 | 699 | struct rds_transport *trans, gfp_t gfp); |
d769ef81 | 700 | void rds_conn_shutdown(struct rds_conn_path *cpath); |
39de8281 | 701 | void rds_conn_destroy(struct rds_connection *conn); |
39de8281 | 702 | void rds_conn_drop(struct rds_connection *conn); |
0cb43965 | 703 | void rds_conn_path_drop(struct rds_conn_path *cpath); |
f3c6808d | 704 | void rds_conn_connect_if_down(struct rds_connection *conn); |
3c0a5900 | 705 | void rds_conn_path_connect_if_down(struct rds_conn_path *cp); |
39de8281 AG |
706 | void rds_for_each_conn_info(struct socket *sock, unsigned int len, |
707 | struct rds_info_iterator *iter, | |
708 | struct rds_info_lengths *lens, | |
709 | int (*visitor)(struct rds_connection *, void *), | |
710 | size_t item_len); | |
39de8281 | 711 | |
6cdaf03f | 712 | __printf(2, 3) |
fb1b3dc4 SV |
713 | void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...); |
714 | #define rds_conn_path_error(cp, fmt...) \ | |
715 | __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt) | |
716 | ||
0cb43965 SV |
717 | static inline int |
718 | rds_conn_path_transition(struct rds_conn_path *cp, int old, int new) | |
719 | { | |
720 | return atomic_cmpxchg(&cp->cp_state, old, new) == old; | |
721 | } | |
722 | ||
39de8281 AG |
723 | static inline int |
724 | rds_conn_transition(struct rds_connection *conn, int old, int new) | |
725 | { | |
7e8f4413 | 726 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
727 | return rds_conn_path_transition(&conn->c_path[0], old, new); |
728 | } | |
729 | ||
730 | static inline int | |
731 | rds_conn_path_state(struct rds_conn_path *cp) | |
732 | { | |
733 | return atomic_read(&cp->cp_state); | |
39de8281 AG |
734 | } |
735 | ||
736 | static inline int | |
737 | rds_conn_state(struct rds_connection *conn) | |
738 | { | |
7e8f4413 | 739 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
740 | return rds_conn_path_state(&conn->c_path[0]); |
741 | } | |
742 | ||
743 | static inline int | |
744 | rds_conn_path_up(struct rds_conn_path *cp) | |
745 | { | |
746 | return atomic_read(&cp->cp_state) == RDS_CONN_UP; | |
39de8281 AG |
747 | } |
748 | ||
749 | static inline int | |
750 | rds_conn_up(struct rds_connection *conn) | |
751 | { | |
7e8f4413 | 752 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 SV |
753 | return rds_conn_path_up(&conn->c_path[0]); |
754 | } | |
755 | ||
756 | static inline int | |
757 | rds_conn_path_connecting(struct rds_conn_path *cp) | |
758 | { | |
759 | return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING; | |
39de8281 AG |
760 | } |
761 | ||
762 | static inline int | |
763 | rds_conn_connecting(struct rds_connection *conn) | |
764 | { | |
7e8f4413 | 765 | WARN_ON(conn->c_trans->t_mp_capable); |
0cb43965 | 766 | return rds_conn_path_connecting(&conn->c_path[0]); |
39de8281 AG |
767 | } |
768 | ||
769 | /* message.c */ | |
770 | struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp); | |
fc445084 | 771 | struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents); |
083735f4 | 772 | int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from); |
39de8281 AG |
773 | struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len); |
774 | void rds_message_populate_header(struct rds_header *hdr, __be16 sport, | |
775 | __be16 dport, u64 seq); | |
776 | int rds_message_add_extension(struct rds_header *hdr, | |
777 | unsigned int type, const void *data, unsigned int len); | |
778 | int rds_message_next_extension(struct rds_header *hdr, | |
779 | unsigned int *pos, void *buf, unsigned int *buflen); | |
39de8281 | 780 | int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset); |
c310e72c | 781 | int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); |
39de8281 AG |
782 | void rds_message_inc_free(struct rds_incoming *inc); |
783 | void rds_message_addref(struct rds_message *rm); | |
784 | void rds_message_put(struct rds_message *rm); | |
785 | void rds_message_wait(struct rds_message *rm); | |
786 | void rds_message_unmapped(struct rds_message *rm); | |
787 | ||
788 | static inline void rds_message_make_checksum(struct rds_header *hdr) | |
789 | { | |
790 | hdr->h_csum = 0; | |
791 | hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2); | |
792 | } | |
793 | ||
794 | static inline int rds_message_verify_checksum(const struct rds_header *hdr) | |
795 | { | |
796 | return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0; | |
797 | } | |
798 | ||
799 | ||
800 | /* page.c */ | |
801 | int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes, | |
802 | gfp_t gfp); | |
39de8281 AG |
803 | void rds_page_exit(void); |
804 | ||
805 | /* recv.c */ | |
806 | void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, | |
807 | __be32 saddr); | |
5e833e02 SV |
808 | void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn, |
809 | __be32 saddr); | |
39de8281 AG |
810 | void rds_inc_put(struct rds_incoming *inc); |
811 | void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, | |
6114eab5 | 812 | struct rds_incoming *inc, gfp_t gfp); |
1b784140 YX |
813 | int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
814 | int msg_flags); | |
39de8281 AG |
815 | void rds_clear_recv_queue(struct rds_sock *rs); |
816 | int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg); | |
817 | void rds_inc_info_copy(struct rds_incoming *inc, | |
818 | struct rds_info_iterator *iter, | |
819 | __be32 saddr, __be32 daddr, int flip); | |
820 | ||
821 | /* send.c */ | |
1b784140 | 822 | int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len); |
d769ef81 | 823 | void rds_send_path_reset(struct rds_conn_path *conn); |
1f9ecd7e | 824 | int rds_send_xmit(struct rds_conn_path *cp); |
39de8281 AG |
825 | struct sockaddr_in; |
826 | void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest); | |
827 | typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack); | |
828 | void rds_send_drop_acked(struct rds_connection *conn, u64 ack, | |
829 | is_acked_func is_acked); | |
5c3d274c SV |
830 | void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack, |
831 | is_acked_func is_acked); | |
69b92b5b | 832 | void rds_send_ping(struct rds_connection *conn, int cp_index); |
45997e9e | 833 | int rds_send_pong(struct rds_conn_path *cp, __be16 dport); |
39de8281 AG |
834 | |
835 | /* rdma.c */ | |
836 | void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force); | |
21f79afa AG |
837 | int rds_get_mr(struct rds_sock *rs, char __user *optval, int optlen); |
838 | int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen); | |
839 | int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen); | |
840 | void rds_rdma_drop_keys(struct rds_sock *rs); | |
841 | int rds_rdma_extra_size(struct rds_rdma_args *args); | |
842 | int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, | |
843 | struct cmsghdr *cmsg); | |
844 | int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm, | |
845 | struct cmsghdr *cmsg); | |
846 | int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm, | |
847 | struct cmsghdr *cmsg); | |
848 | int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm, | |
849 | struct cmsghdr *cmsg); | |
f8b3aaf2 | 850 | void rds_rdma_free_op(struct rm_rdma_op *ro); |
d0ab25a8 | 851 | void rds_atomic_free_op(struct rm_atomic_op *ao); |
15133f6e AG |
852 | void rds_rdma_send_complete(struct rds_message *rm, int wc_status); |
853 | void rds_atomic_send_complete(struct rds_message *rm, int wc_status); | |
854 | int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm, | |
855 | struct cmsghdr *cmsg); | |
21f79afa | 856 | |
c1b1203d | 857 | void __rds_put_mr_final(struct rds_mr *mr); |
21f79afa AG |
858 | static inline void rds_mr_put(struct rds_mr *mr) |
859 | { | |
803ea850 | 860 | if (refcount_dec_and_test(&mr->r_refcount)) |
21f79afa AG |
861 | __rds_put_mr_final(mr); |
862 | } | |
39de8281 AG |
863 | |
864 | /* stats.c */ | |
9b8de747 | 865 | DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); |
39de8281 AG |
866 | #define rds_stats_inc_which(which, member) do { \ |
867 | per_cpu(which, get_cpu()).member++; \ | |
868 | put_cpu(); \ | |
869 | } while (0) | |
870 | #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member) | |
871 | #define rds_stats_add_which(which, member, count) do { \ | |
872 | per_cpu(which, get_cpu()).member += count; \ | |
873 | put_cpu(); \ | |
874 | } while (0) | |
875 | #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count) | |
ef87b7ea | 876 | int rds_stats_init(void); |
39de8281 AG |
877 | void rds_stats_exit(void); |
878 | void rds_stats_info_copy(struct rds_info_iterator *iter, | |
36cbd3dc JE |
879 | uint64_t *values, const char *const *names, |
880 | size_t nr); | |
39de8281 AG |
881 | |
882 | /* sysctl.c */ | |
ef87b7ea | 883 | int rds_sysctl_init(void); |
39de8281 AG |
884 | void rds_sysctl_exit(void); |
885 | extern unsigned long rds_sysctl_sndbuf_min; | |
886 | extern unsigned long rds_sysctl_sndbuf_default; | |
887 | extern unsigned long rds_sysctl_sndbuf_max; | |
888 | extern unsigned long rds_sysctl_reconnect_min_jiffies; | |
889 | extern unsigned long rds_sysctl_reconnect_max_jiffies; | |
890 | extern unsigned int rds_sysctl_max_unacked_packets; | |
891 | extern unsigned int rds_sysctl_max_unacked_bytes; | |
892 | extern unsigned int rds_sysctl_ping_enable; | |
893 | extern unsigned long rds_sysctl_trace_flags; | |
894 | extern unsigned int rds_sysctl_trace_level; | |
895 | ||
896 | /* threads.c */ | |
ef87b7ea | 897 | int rds_threads_init(void); |
39de8281 AG |
898 | void rds_threads_exit(void); |
899 | extern struct workqueue_struct *rds_wq; | |
0cb43965 | 900 | void rds_queue_reconnect(struct rds_conn_path *cp); |
39de8281 AG |
901 | void rds_connect_worker(struct work_struct *); |
902 | void rds_shutdown_worker(struct work_struct *); | |
903 | void rds_send_worker(struct work_struct *); | |
904 | void rds_recv_worker(struct work_struct *); | |
0cb43965 | 905 | void rds_connect_path_complete(struct rds_conn_path *conn, int curr); |
39de8281 AG |
906 | void rds_connect_complete(struct rds_connection *conn); |
907 | ||
908 | /* transport.c */ | |
a8d63a53 | 909 | void rds_trans_register(struct rds_transport *trans); |
39de8281 | 910 | void rds_trans_unregister(struct rds_transport *trans); |
d5a8ac28 | 911 | struct rds_transport *rds_trans_get_preferred(struct net *net, __be32 addr); |
5adb5bc6 | 912 | void rds_trans_put(struct rds_transport *trans); |
39de8281 AG |
913 | unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter, |
914 | unsigned int avail); | |
d97dac54 | 915 | struct rds_transport *rds_trans_get(int t_type); |
ef87b7ea | 916 | int rds_trans_init(void); |
39de8281 AG |
917 | void rds_trans_exit(void); |
918 | ||
919 | #endif |