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ec16227e AG |
1 | #ifndef _RDS_IB_H |
2 | #define _RDS_IB_H | |
3 | ||
4 | #include <rdma/ib_verbs.h> | |
5 | #include <rdma/rdma_cm.h> | |
a6b7a407 | 6 | #include <linux/interrupt.h> |
e4c52c98 AG |
7 | #include <linux/pci.h> |
8 | #include <linux/slab.h> | |
ec16227e AG |
9 | #include "rds.h" |
10 | #include "rdma_transport.h" | |
11 | ||
12 | #define RDS_FMR_SIZE 256 | |
eabb7322 | 13 | #define RDS_FMR_POOL_SIZE 8192 |
ec16227e AG |
14 | |
15 | #define RDS_IB_MAX_SGE 8 | |
16 | #define RDS_IB_RECV_SGE 2 | |
17 | ||
18 | #define RDS_IB_DEFAULT_RECV_WR 1024 | |
19 | #define RDS_IB_DEFAULT_SEND_WR 256 | |
20 | ||
3ba23ade AG |
21 | #define RDS_IB_DEFAULT_RETRY_COUNT 2 |
22 | ||
ec16227e AG |
23 | #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ |
24 | ||
33244125 CM |
25 | #define RDS_IB_RECYCLE_BATCH_COUNT 32 |
26 | ||
ea819867 | 27 | extern struct rw_semaphore rds_ib_devices_lock; |
ec16227e AG |
28 | extern struct list_head rds_ib_devices; |
29 | ||
30 | /* | |
31 | * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to | |
32 | * try and minimize the amount of memory tied up both the device and | |
33 | * socket receive queues. | |
34 | */ | |
ec16227e AG |
35 | struct rds_page_frag { |
36 | struct list_head f_item; | |
33244125 | 37 | struct list_head f_cache_entry; |
0b088e00 | 38 | struct scatterlist f_sg; |
ec16227e AG |
39 | }; |
40 | ||
41 | struct rds_ib_incoming { | |
42 | struct list_head ii_frags; | |
33244125 | 43 | struct list_head ii_cache_entry; |
ec16227e AG |
44 | struct rds_incoming ii_inc; |
45 | }; | |
46 | ||
33244125 CM |
47 | struct rds_ib_cache_head { |
48 | struct list_head *first; | |
49 | unsigned long count; | |
50 | }; | |
51 | ||
52 | struct rds_ib_refill_cache { | |
ae4b46e9 | 53 | struct rds_ib_cache_head __percpu *percpu; |
33244125 CM |
54 | struct list_head *xfer; |
55 | struct list_head *ready; | |
56 | }; | |
57 | ||
ec16227e AG |
58 | struct rds_ib_connect_private { |
59 | /* Add new fields at the end, and don't permute existing fields. */ | |
60 | __be32 dp_saddr; | |
61 | __be32 dp_daddr; | |
62 | u8 dp_protocol_major; | |
63 | u8 dp_protocol_minor; | |
64 | __be16 dp_protocol_minor_mask; /* bitmask */ | |
65 | __be32 dp_reserved1; | |
66 | __be64 dp_ack_seq; | |
67 | __be32 dp_credit; /* non-zero enables flow ctl */ | |
68 | }; | |
69 | ||
70 | struct rds_ib_send_work { | |
ff3d7d36 | 71 | void *s_op; |
ec16227e AG |
72 | struct ib_send_wr s_wr; |
73 | struct ib_sge s_sge[RDS_IB_MAX_SGE]; | |
74 | unsigned long s_queued; | |
75 | }; | |
76 | ||
77 | struct rds_ib_recv_work { | |
78 | struct rds_ib_incoming *r_ibinc; | |
79 | struct rds_page_frag *r_frag; | |
80 | struct ib_recv_wr r_wr; | |
81 | struct ib_sge r_sge[2]; | |
82 | }; | |
83 | ||
84 | struct rds_ib_work_ring { | |
85 | u32 w_nr; | |
86 | u32 w_alloc_ptr; | |
87 | u32 w_alloc_ctr; | |
88 | u32 w_free_ptr; | |
89 | atomic_t w_free_ctr; | |
90 | }; | |
91 | ||
92 | struct rds_ib_device; | |
93 | ||
94 | struct rds_ib_connection { | |
95 | ||
96 | struct list_head ib_node; | |
97 | struct rds_ib_device *rds_ibdev; | |
98 | struct rds_connection *conn; | |
99 | ||
100 | /* alphabet soup, IBTA style */ | |
101 | struct rdma_cm_id *i_cm_id; | |
102 | struct ib_pd *i_pd; | |
103 | struct ib_mr *i_mr; | |
104 | struct ib_cq *i_send_cq; | |
105 | struct ib_cq *i_recv_cq; | |
106 | ||
107 | /* tx */ | |
108 | struct rds_ib_work_ring i_send_ring; | |
ff3d7d36 | 109 | struct rm_data_op *i_data_op; |
ec16227e AG |
110 | struct rds_header *i_send_hdrs; |
111 | u64 i_send_hdrs_dma; | |
112 | struct rds_ib_send_work *i_sends; | |
f046011c | 113 | atomic_t i_signaled_sends; |
ec16227e AG |
114 | |
115 | /* rx */ | |
d521b63b | 116 | struct tasklet_struct i_recv_tasklet; |
ec16227e AG |
117 | struct mutex i_recv_mutex; |
118 | struct rds_ib_work_ring i_recv_ring; | |
119 | struct rds_ib_incoming *i_ibinc; | |
120 | u32 i_recv_data_rem; | |
121 | struct rds_header *i_recv_hdrs; | |
122 | u64 i_recv_hdrs_dma; | |
123 | struct rds_ib_recv_work *i_recvs; | |
ec16227e | 124 | u64 i_ack_recv; /* last ACK received */ |
33244125 CM |
125 | struct rds_ib_refill_cache i_cache_incs; |
126 | struct rds_ib_refill_cache i_cache_frags; | |
ec16227e AG |
127 | |
128 | /* sending acks */ | |
129 | unsigned long i_ack_flags; | |
8cbd9606 AG |
130 | #ifdef KERNEL_HAS_ATOMIC64 |
131 | atomic64_t i_ack_next; /* next ACK to send */ | |
132 | #else | |
133 | spinlock_t i_ack_lock; /* protect i_ack_next */ | |
ec16227e | 134 | u64 i_ack_next; /* next ACK to send */ |
8cbd9606 | 135 | #endif |
ec16227e AG |
136 | struct rds_header *i_ack; |
137 | struct ib_send_wr i_ack_wr; | |
138 | struct ib_sge i_ack_sge; | |
139 | u64 i_ack_dma; | |
140 | unsigned long i_ack_queued; | |
141 | ||
142 | /* Flow control related information | |
143 | * | |
144 | * Our algorithm uses a pair variables that we need to access | |
145 | * atomically - one for the send credits, and one posted | |
146 | * recv credits we need to transfer to remote. | |
147 | * Rather than protect them using a slow spinlock, we put both into | |
148 | * a single atomic_t and update it using cmpxchg | |
149 | */ | |
150 | atomic_t i_credits; | |
151 | ||
152 | /* Protocol version specific information */ | |
153 | unsigned int i_flowctl:1; /* enable/disable flow ctl */ | |
154 | ||
155 | /* Batched completions */ | |
156 | unsigned int i_unsignaled_wrs; | |
ec16227e AG |
157 | }; |
158 | ||
159 | /* This assumes that atomic_t is at least 32 bits */ | |
160 | #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) | |
161 | #define IB_GET_POST_CREDITS(v) ((v) >> 16) | |
162 | #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) | |
163 | #define IB_SET_POST_CREDITS(v) ((v) << 16) | |
164 | ||
165 | struct rds_ib_ipaddr { | |
166 | struct list_head list; | |
167 | __be32 ipaddr; | |
168 | }; | |
169 | ||
170 | struct rds_ib_device { | |
171 | struct list_head list; | |
172 | struct list_head ipaddr_list; | |
173 | struct list_head conn_list; | |
174 | struct ib_device *dev; | |
175 | struct ib_pd *pd; | |
176 | struct ib_mr *mr; | |
177 | struct rds_ib_mr_pool *mr_pool; | |
ec16227e AG |
178 | unsigned int fmr_max_remaps; |
179 | unsigned int max_fmrs; | |
180 | int max_sge; | |
181 | unsigned int max_wrs; | |
40589e74 AG |
182 | unsigned int max_initiator_depth; |
183 | unsigned int max_responder_resources; | |
ec16227e | 184 | spinlock_t spinlock; /* protect the above */ |
3e0249f9 ZB |
185 | atomic_t refcount; |
186 | struct work_struct free_work; | |
ec16227e AG |
187 | }; |
188 | ||
a0c6ffbc | 189 | #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device) |
e4c52c98 AG |
190 | #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev) |
191 | ||
ec16227e AG |
192 | /* bits for i_ack_flags */ |
193 | #define IB_ACK_IN_FLIGHT 0 | |
194 | #define IB_ACK_REQUESTED 1 | |
195 | ||
196 | /* Magic WR_ID for ACKs */ | |
197 | #define RDS_IB_ACK_WR_ID (~(u64) 0) | |
198 | ||
199 | struct rds_ib_statistics { | |
200 | uint64_t s_ib_connect_raced; | |
201 | uint64_t s_ib_listen_closed_stale; | |
202 | uint64_t s_ib_tx_cq_call; | |
203 | uint64_t s_ib_tx_cq_event; | |
204 | uint64_t s_ib_tx_ring_full; | |
205 | uint64_t s_ib_tx_throttle; | |
206 | uint64_t s_ib_tx_sg_mapping_failure; | |
207 | uint64_t s_ib_tx_stalled; | |
208 | uint64_t s_ib_tx_credit_updates; | |
209 | uint64_t s_ib_rx_cq_call; | |
210 | uint64_t s_ib_rx_cq_event; | |
211 | uint64_t s_ib_rx_ring_empty; | |
212 | uint64_t s_ib_rx_refill_from_cq; | |
213 | uint64_t s_ib_rx_refill_from_thread; | |
214 | uint64_t s_ib_rx_alloc_limit; | |
215 | uint64_t s_ib_rx_credit_updates; | |
216 | uint64_t s_ib_ack_sent; | |
217 | uint64_t s_ib_ack_send_failure; | |
218 | uint64_t s_ib_ack_send_delayed; | |
219 | uint64_t s_ib_ack_send_piggybacked; | |
220 | uint64_t s_ib_ack_received; | |
221 | uint64_t s_ib_rdma_mr_alloc; | |
222 | uint64_t s_ib_rdma_mr_free; | |
223 | uint64_t s_ib_rdma_mr_used; | |
224 | uint64_t s_ib_rdma_mr_pool_flush; | |
225 | uint64_t s_ib_rdma_mr_pool_wait; | |
226 | uint64_t s_ib_rdma_mr_pool_depleted; | |
51e2cba8 AG |
227 | uint64_t s_ib_atomic_cswp; |
228 | uint64_t s_ib_atomic_fadd; | |
ec16227e AG |
229 | }; |
230 | ||
231 | extern struct workqueue_struct *rds_ib_wq; | |
232 | ||
233 | /* | |
234 | * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h | |
235 | * doesn't define it. | |
236 | */ | |
237 | static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, | |
d2a9ec64 FF |
238 | struct scatterlist *sglist, |
239 | unsigned int sg_dma_len, | |
240 | int direction) | |
ec16227e | 241 | { |
d2a9ec64 | 242 | struct scatterlist *sg; |
ec16227e AG |
243 | unsigned int i; |
244 | ||
d2a9ec64 | 245 | for_each_sg(sglist, sg, sg_dma_len, i) { |
ec16227e | 246 | ib_dma_sync_single_for_cpu(dev, |
d2a9ec64 FF |
247 | ib_sg_dma_address(dev, sg), |
248 | ib_sg_dma_len(dev, sg), | |
ec16227e AG |
249 | direction); |
250 | } | |
251 | } | |
252 | #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu | |
253 | ||
254 | static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, | |
d2a9ec64 FF |
255 | struct scatterlist *sglist, |
256 | unsigned int sg_dma_len, | |
257 | int direction) | |
ec16227e | 258 | { |
d2a9ec64 | 259 | struct scatterlist *sg; |
ec16227e AG |
260 | unsigned int i; |
261 | ||
d2a9ec64 | 262 | for_each_sg(sglist, sg, sg_dma_len, i) { |
ec16227e | 263 | ib_dma_sync_single_for_device(dev, |
d2a9ec64 FF |
264 | ib_sg_dma_address(dev, sg), |
265 | ib_sg_dma_len(dev, sg), | |
ec16227e AG |
266 | direction); |
267 | } | |
268 | } | |
269 | #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device | |
270 | ||
271 | ||
272 | /* ib.c */ | |
273 | extern struct rds_transport rds_ib_transport; | |
3e0249f9 ZB |
274 | struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device); |
275 | void rds_ib_dev_put(struct rds_ib_device *rds_ibdev); | |
ec16227e AG |
276 | extern struct ib_client rds_ib_client; |
277 | ||
ec16227e | 278 | extern unsigned int fmr_message_size; |
3ba23ade | 279 | extern unsigned int rds_ib_retry_count; |
ec16227e AG |
280 | |
281 | extern spinlock_t ib_nodev_conns_lock; | |
282 | extern struct list_head ib_nodev_conns; | |
283 | ||
284 | /* ib_cm.c */ | |
285 | int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); | |
286 | void rds_ib_conn_free(void *arg); | |
287 | int rds_ib_conn_connect(struct rds_connection *conn); | |
288 | void rds_ib_conn_shutdown(struct rds_connection *conn); | |
289 | void rds_ib_state_change(struct sock *sk); | |
ef87b7ea | 290 | int rds_ib_listen_init(void); |
ec16227e AG |
291 | void rds_ib_listen_stop(void); |
292 | void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); | |
293 | int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, | |
294 | struct rdma_cm_event *event); | |
295 | int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); | |
296 | void rds_ib_cm_connect_complete(struct rds_connection *conn, | |
297 | struct rdma_cm_event *event); | |
298 | ||
299 | ||
300 | #define rds_ib_conn_error(conn, fmt...) \ | |
301 | __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) | |
302 | ||
303 | /* ib_rdma.c */ | |
304 | int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); | |
745cbcca AG |
305 | void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); |
306 | void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); | |
8aeb1ba6 | 307 | void rds_ib_destroy_nodev_conns(void); |
ec16227e AG |
308 | struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); |
309 | void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); | |
310 | void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); | |
311 | void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, | |
312 | struct rds_sock *rs, u32 *key_ret); | |
313 | void rds_ib_sync_mr(void *trans_private, int dir); | |
314 | void rds_ib_free_mr(void *trans_private, int invalidate); | |
315 | void rds_ib_flush_mrs(void); | |
316 | ||
317 | /* ib_recv.c */ | |
ef87b7ea | 318 | int rds_ib_recv_init(void); |
ec16227e AG |
319 | void rds_ib_recv_exit(void); |
320 | int rds_ib_recv(struct rds_connection *conn); | |
33244125 CM |
321 | int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic); |
322 | void rds_ib_recv_free_caches(struct rds_ib_connection *ic); | |
b6fb0df1 | 323 | void rds_ib_recv_refill(struct rds_connection *conn, int prefill); |
ec16227e | 324 | void rds_ib_inc_free(struct rds_incoming *inc); |
c310e72c | 325 | int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to); |
ec16227e | 326 | void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); |
d521b63b | 327 | void rds_ib_recv_tasklet_fn(unsigned long data); |
ec16227e AG |
328 | void rds_ib_recv_init_ring(struct rds_ib_connection *ic); |
329 | void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); | |
330 | void rds_ib_recv_init_ack(struct rds_ib_connection *ic); | |
331 | void rds_ib_attempt_ack(struct rds_ib_connection *ic); | |
332 | void rds_ib_ack_send_complete(struct rds_ib_connection *ic); | |
333 | u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); | |
334 | ||
335 | /* ib_ring.c */ | |
336 | void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); | |
337 | void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); | |
338 | u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); | |
339 | void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); | |
340 | void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); | |
341 | int rds_ib_ring_empty(struct rds_ib_work_ring *ring); | |
342 | int rds_ib_ring_low(struct rds_ib_work_ring *ring); | |
343 | u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); | |
344 | u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); | |
345 | extern wait_queue_head_t rds_ib_ring_empty_wait; | |
346 | ||
347 | /* ib_send.c */ | |
348 | void rds_ib_xmit_complete(struct rds_connection *conn); | |
349 | int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, | |
350 | unsigned int hdr_off, unsigned int sg, unsigned int off); | |
351 | void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); | |
352 | void rds_ib_send_init_ring(struct rds_ib_connection *ic); | |
353 | void rds_ib_send_clear_ring(struct rds_ib_connection *ic); | |
f8b3aaf2 | 354 | int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op); |
ec16227e AG |
355 | void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); |
356 | void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); | |
357 | int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, | |
7b70d033 | 358 | u32 *adv_credits, int need_posted, int max_posted); |
ff3d7d36 | 359 | int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op); |
ec16227e AG |
360 | |
361 | /* ib_stats.c */ | |
362 | DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); | |
363 | #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) | |
364 | unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, | |
365 | unsigned int avail); | |
366 | ||
367 | /* ib_sysctl.c */ | |
ef87b7ea | 368 | int rds_ib_sysctl_init(void); |
ec16227e AG |
369 | void rds_ib_sysctl_exit(void); |
370 | extern unsigned long rds_ib_sysctl_max_send_wr; | |
371 | extern unsigned long rds_ib_sysctl_max_recv_wr; | |
372 | extern unsigned long rds_ib_sysctl_max_unsig_wrs; | |
373 | extern unsigned long rds_ib_sysctl_max_unsig_bytes; | |
374 | extern unsigned long rds_ib_sysctl_max_recv_allocation; | |
375 | extern unsigned int rds_ib_sysctl_flow_control; | |
ec16227e | 376 | |
ec16227e | 377 | #endif |