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1 | #ifndef _RDS_IB_H |
2 | #define _RDS_IB_H |
3 | |
4 | #include <rdma/ib_verbs.h> |
5 | #include <rdma/rdma_cm.h> |
6 | #include "rds.h" |
7 | #include "rdma_transport.h" |
8 | |
9 | #define RDS_FMR_SIZE 256 |
10 | #define RDS_FMR_POOL_SIZE 4096 |
11 | |
12 | #define RDS_IB_MAX_SGE 8 |
13 | #define RDS_IB_RECV_SGE 2 |
14 | |
15 | #define RDS_IB_DEFAULT_RECV_WR 1024 |
16 | #define RDS_IB_DEFAULT_SEND_WR 256 |
17 | |
18 | #define RDS_IB_DEFAULT_RETRY_COUNT 2 |
19 | |
20 | #define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */ |
21 | |
22 | extern struct list_head rds_ib_devices; |
23 | |
24 | /* |
25 | * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to |
26 | * try and minimize the amount of memory tied up both the device and |
27 | * socket receive queues. |
28 | */ |
29 | /* page offset of the final full frag that fits in the page */ |
30 | #define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE) |
31 | struct rds_page_frag { |
32 | struct list_head f_item; |
33 | struct page *f_page; |
34 | unsigned long f_offset; |
35 | dma_addr_t f_mapped; |
36 | }; |
37 | |
38 | struct rds_ib_incoming { |
39 | struct list_head ii_frags; |
40 | struct rds_incoming ii_inc; |
41 | }; |
42 | |
43 | struct rds_ib_connect_private { |
44 | /* Add new fields at the end, and don't permute existing fields. */ |
45 | __be32 dp_saddr; |
46 | __be32 dp_daddr; |
47 | u8 dp_protocol_major; |
48 | u8 dp_protocol_minor; |
49 | __be16 dp_protocol_minor_mask; /* bitmask */ |
50 | __be32 dp_reserved1; |
51 | __be64 dp_ack_seq; |
52 | __be32 dp_credit; /* non-zero enables flow ctl */ |
53 | }; |
54 | |
55 | struct rds_ib_send_work { |
56 | struct rds_message *s_rm; |
57 | struct rds_rdma_op *s_op; |
58 | struct ib_send_wr s_wr; |
59 | struct ib_sge s_sge[RDS_IB_MAX_SGE]; |
60 | unsigned long s_queued; |
61 | }; |
62 | |
63 | struct rds_ib_recv_work { |
64 | struct rds_ib_incoming *r_ibinc; |
65 | struct rds_page_frag *r_frag; |
66 | struct ib_recv_wr r_wr; |
67 | struct ib_sge r_sge[2]; |
68 | }; |
69 | |
70 | struct rds_ib_work_ring { |
71 | u32 w_nr; |
72 | u32 w_alloc_ptr; |
73 | u32 w_alloc_ctr; |
74 | u32 w_free_ptr; |
75 | atomic_t w_free_ctr; |
76 | }; |
77 | |
78 | struct rds_ib_device; |
79 | |
80 | struct rds_ib_connection { |
81 | |
82 | struct list_head ib_node; |
83 | struct rds_ib_device *rds_ibdev; |
84 | struct rds_connection *conn; |
85 | |
86 | /* alphabet soup, IBTA style */ |
87 | struct rdma_cm_id *i_cm_id; |
88 | struct ib_pd *i_pd; |
89 | struct ib_mr *i_mr; |
90 | struct ib_cq *i_send_cq; |
91 | struct ib_cq *i_recv_cq; |
92 | |
93 | /* tx */ |
94 | struct rds_ib_work_ring i_send_ring; |
95 | struct rds_message *i_rm; |
96 | struct rds_header *i_send_hdrs; |
97 | u64 i_send_hdrs_dma; |
98 | struct rds_ib_send_work *i_sends; |
99 | |
100 | /* rx */ |
101 | struct tasklet_struct i_recv_tasklet; |
102 | struct mutex i_recv_mutex; |
103 | struct rds_ib_work_ring i_recv_ring; |
104 | struct rds_ib_incoming *i_ibinc; |
105 | u32 i_recv_data_rem; |
106 | struct rds_header *i_recv_hdrs; |
107 | u64 i_recv_hdrs_dma; |
108 | struct rds_ib_recv_work *i_recvs; |
109 | struct rds_page_frag i_frag; |
110 | u64 i_ack_recv; /* last ACK received */ |
111 | |
112 | /* sending acks */ |
113 | unsigned long i_ack_flags; |
114 | #ifdef KERNEL_HAS_ATOMIC64 |
115 | atomic64_t i_ack_next; /* next ACK to send */ |
116 | #else |
117 | spinlock_t i_ack_lock; /* protect i_ack_next */ |
118 | u64 i_ack_next; /* next ACK to send */ |
119 | #endif |
120 | struct rds_header *i_ack; |
121 | struct ib_send_wr i_ack_wr; |
122 | struct ib_sge i_ack_sge; |
123 | u64 i_ack_dma; |
124 | unsigned long i_ack_queued; |
125 | |
126 | /* Flow control related information |
127 | * |
128 | * Our algorithm uses a pair variables that we need to access |
129 | * atomically - one for the send credits, and one posted |
130 | * recv credits we need to transfer to remote. |
131 | * Rather than protect them using a slow spinlock, we put both into |
132 | * a single atomic_t and update it using cmpxchg |
133 | */ |
134 | atomic_t i_credits; |
135 | |
136 | /* Protocol version specific information */ |
137 | unsigned int i_flowctl:1; /* enable/disable flow ctl */ |
138 | |
139 | /* Batched completions */ |
140 | unsigned int i_unsignaled_wrs; |
141 | long i_unsignaled_bytes; |
142 | }; |
143 | |
144 | /* This assumes that atomic_t is at least 32 bits */ |
145 | #define IB_GET_SEND_CREDITS(v) ((v) & 0xffff) |
146 | #define IB_GET_POST_CREDITS(v) ((v) >> 16) |
147 | #define IB_SET_SEND_CREDITS(v) ((v) & 0xffff) |
148 | #define IB_SET_POST_CREDITS(v) ((v) << 16) |
149 | |
150 | struct rds_ib_ipaddr { |
151 | struct list_head list; |
152 | __be32 ipaddr; |
153 | }; |
154 | |
155 | struct rds_ib_device { |
156 | struct list_head list; |
157 | struct list_head ipaddr_list; |
158 | struct list_head conn_list; |
159 | struct ib_device *dev; |
160 | struct ib_pd *pd; |
161 | struct ib_mr *mr; |
162 | struct rds_ib_mr_pool *mr_pool; |
163 | unsigned int fmr_max_remaps; |
164 | unsigned int max_fmrs; |
165 | int max_sge; |
166 | unsigned int max_wrs; |
167 | spinlock_t spinlock; /* protect the above */ |
168 | }; |
169 | |
170 | /* bits for i_ack_flags */ |
171 | #define IB_ACK_IN_FLIGHT 0 |
172 | #define IB_ACK_REQUESTED 1 |
173 | |
174 | /* Magic WR_ID for ACKs */ |
175 | #define RDS_IB_ACK_WR_ID (~(u64) 0) |
176 | |
177 | struct rds_ib_statistics { |
178 | uint64_t s_ib_connect_raced; |
179 | uint64_t s_ib_listen_closed_stale; |
180 | uint64_t s_ib_tx_cq_call; |
181 | uint64_t s_ib_tx_cq_event; |
182 | uint64_t s_ib_tx_ring_full; |
183 | uint64_t s_ib_tx_throttle; |
184 | uint64_t s_ib_tx_sg_mapping_failure; |
185 | uint64_t s_ib_tx_stalled; |
186 | uint64_t s_ib_tx_credit_updates; |
187 | uint64_t s_ib_rx_cq_call; |
188 | uint64_t s_ib_rx_cq_event; |
189 | uint64_t s_ib_rx_ring_empty; |
190 | uint64_t s_ib_rx_refill_from_cq; |
191 | uint64_t s_ib_rx_refill_from_thread; |
192 | uint64_t s_ib_rx_alloc_limit; |
193 | uint64_t s_ib_rx_credit_updates; |
194 | uint64_t s_ib_ack_sent; |
195 | uint64_t s_ib_ack_send_failure; |
196 | uint64_t s_ib_ack_send_delayed; |
197 | uint64_t s_ib_ack_send_piggybacked; |
198 | uint64_t s_ib_ack_received; |
199 | uint64_t s_ib_rdma_mr_alloc; |
200 | uint64_t s_ib_rdma_mr_free; |
201 | uint64_t s_ib_rdma_mr_used; |
202 | uint64_t s_ib_rdma_mr_pool_flush; |
203 | uint64_t s_ib_rdma_mr_pool_wait; |
204 | uint64_t s_ib_rdma_mr_pool_depleted; |
205 | }; |
206 | |
207 | extern struct workqueue_struct *rds_ib_wq; |
208 | |
209 | /* |
210 | * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h |
211 | * doesn't define it. |
212 | */ |
213 | static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev, |
214 | struct scatterlist *sg, unsigned int sg_dma_len, int direction) |
215 | { |
216 | unsigned int i; |
217 | |
218 | for (i = 0; i < sg_dma_len; ++i) { |
219 | ib_dma_sync_single_for_cpu(dev, |
220 | ib_sg_dma_address(dev, &sg[i]), |
221 | ib_sg_dma_len(dev, &sg[i]), |
222 | direction); |
223 | } |
224 | } |
225 | #define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu |
226 | |
227 | static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev, |
228 | struct scatterlist *sg, unsigned int sg_dma_len, int direction) |
229 | { |
230 | unsigned int i; |
231 | |
232 | for (i = 0; i < sg_dma_len; ++i) { |
233 | ib_dma_sync_single_for_device(dev, |
234 | ib_sg_dma_address(dev, &sg[i]), |
235 | ib_sg_dma_len(dev, &sg[i]), |
236 | direction); |
237 | } |
238 | } |
239 | #define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device |
240 | |
241 | |
242 | /* ib.c */ |
243 | extern struct rds_transport rds_ib_transport; |
244 | extern void rds_ib_add_one(struct ib_device *device); |
245 | extern void rds_ib_remove_one(struct ib_device *device); |
246 | extern struct ib_client rds_ib_client; |
247 | |
248 | extern unsigned int fmr_pool_size; |
249 | extern unsigned int fmr_message_size; |
250 | extern unsigned int rds_ib_retry_count; |
251 | |
252 | extern spinlock_t ib_nodev_conns_lock; |
253 | extern struct list_head ib_nodev_conns; |
254 | |
255 | /* ib_cm.c */ |
256 | int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp); |
257 | void rds_ib_conn_free(void *arg); |
258 | int rds_ib_conn_connect(struct rds_connection *conn); |
259 | void rds_ib_conn_shutdown(struct rds_connection *conn); |
260 | void rds_ib_state_change(struct sock *sk); |
261 | int __init rds_ib_listen_init(void); |
262 | void rds_ib_listen_stop(void); |
263 | void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...); |
264 | int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, |
265 | struct rdma_cm_event *event); |
266 | int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id); |
267 | void rds_ib_cm_connect_complete(struct rds_connection *conn, |
268 | struct rdma_cm_event *event); |
269 | |
270 | |
271 | #define rds_ib_conn_error(conn, fmt...) \ |
272 | __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt) |
273 | |
274 | /* ib_rdma.c */ |
275 | int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr); |
276 | void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); |
277 | void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn); |
278 | void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock); |
279 | static inline void rds_ib_destroy_nodev_conns(void) |
280 | { |
281 | __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock); |
282 | } |
283 | static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev) |
284 | { |
285 | __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock); |
286 | } |
287 | struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *); |
288 | void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo); |
289 | void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *); |
290 | void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents, |
291 | struct rds_sock *rs, u32 *key_ret); |
292 | void rds_ib_sync_mr(void *trans_private, int dir); |
293 | void rds_ib_free_mr(void *trans_private, int invalidate); |
294 | void rds_ib_flush_mrs(void); |
295 | |
296 | /* ib_recv.c */ |
297 | int __init rds_ib_recv_init(void); |
298 | void rds_ib_recv_exit(void); |
299 | int rds_ib_recv(struct rds_connection *conn); |
300 | int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp, |
301 | gfp_t page_gfp, int prefill); |
302 | void rds_ib_inc_purge(struct rds_incoming *inc); |
303 | void rds_ib_inc_free(struct rds_incoming *inc); |
304 | int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, |
305 | size_t size); |
306 | void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); |
307 | void rds_ib_recv_tasklet_fn(unsigned long data); |
308 | void rds_ib_recv_init_ring(struct rds_ib_connection *ic); |
309 | void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); |
310 | void rds_ib_recv_init_ack(struct rds_ib_connection *ic); |
311 | void rds_ib_attempt_ack(struct rds_ib_connection *ic); |
312 | void rds_ib_ack_send_complete(struct rds_ib_connection *ic); |
313 | u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic); |
314 | |
315 | /* ib_ring.c */ |
316 | void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr); |
317 | void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr); |
318 | u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos); |
319 | void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val); |
320 | void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val); |
321 | int rds_ib_ring_empty(struct rds_ib_work_ring *ring); |
322 | int rds_ib_ring_low(struct rds_ib_work_ring *ring); |
323 | u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring); |
324 | u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest); |
325 | extern wait_queue_head_t rds_ib_ring_empty_wait; |
326 | |
327 | /* ib_send.c */ |
328 | void rds_ib_xmit_complete(struct rds_connection *conn); |
329 | int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm, |
330 | unsigned int hdr_off, unsigned int sg, unsigned int off); |
331 | void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context); |
332 | void rds_ib_send_init_ring(struct rds_ib_connection *ic); |
333 | void rds_ib_send_clear_ring(struct rds_ib_connection *ic); |
334 | int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op); |
335 | void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits); |
336 | void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted); |
337 | int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted, |
338 | u32 *adv_credits, int need_posted, int max_posted); |
339 | |
340 | /* ib_stats.c */ |
341 | DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats); |
342 | #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member) |
343 | unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter, |
344 | unsigned int avail); |
345 | |
346 | /* ib_sysctl.c */ |
347 | int __init rds_ib_sysctl_init(void); |
348 | void rds_ib_sysctl_exit(void); |
349 | extern unsigned long rds_ib_sysctl_max_send_wr; |
350 | extern unsigned long rds_ib_sysctl_max_recv_wr; |
351 | extern unsigned long rds_ib_sysctl_max_unsig_wrs; |
352 | extern unsigned long rds_ib_sysctl_max_unsig_bytes; |
353 | extern unsigned long rds_ib_sysctl_max_recv_allocation; |
354 | extern unsigned int rds_ib_sysctl_flow_control; |
355 | extern ctl_table rds_ib_sysctl_table[]; |
356 | |
357 | /* |
358 | * Helper functions for getting/setting the header and data SGEs in |
359 | * RDS packets (not RDMA) |
360 | * |
361 | * From version 3.1 onwards, header is in front of data in the sge. |
362 | */ |
363 | static inline struct ib_sge * |
364 | rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge) |
365 | { |
366 | if (ic->conn->c_version > RDS_PROTOCOL_3_0) |
367 | return &sge[0]; |
368 | else |
369 | return &sge[1]; |
370 | } |
371 | |
372 | static inline struct ib_sge * |
373 | rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge) |
374 | { |
375 | if (ic->conn->c_version > RDS_PROTOCOL_3_0) |
376 | return &sge[1]; |
377 | else |
378 | return &sge[0]; |
379 | } |
380 | |
381 | #endif |
382 |
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