rds: make local functions/variables static
[linux-3.10.git] / net / rds / ib.h
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 <linux/pci.h>
7 #include <linux/slab.h>
8 #include "rds.h"
9 #include "rdma_transport.h"
10
11 #define RDS_FMR_SIZE                    256
12 #define RDS_FMR_POOL_SIZE               8192
13
14 #define RDS_IB_MAX_SGE                  8
15 #define RDS_IB_RECV_SGE                 2
16
17 #define RDS_IB_DEFAULT_RECV_WR          1024
18 #define RDS_IB_DEFAULT_SEND_WR          256
19
20 #define RDS_IB_DEFAULT_RETRY_COUNT      2
21
22 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
23
24 #define RDS_IB_RECYCLE_BATCH_COUNT      32
25
26 extern struct rw_semaphore rds_ib_devices_lock;
27 extern struct list_head rds_ib_devices;
28
29 /*
30  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
31  * try and minimize the amount of memory tied up both the device and
32  * socket receive queues.
33  */
34 struct rds_page_frag {
35         struct list_head        f_item;
36         struct list_head        f_cache_entry;
37         struct scatterlist      f_sg;
38 };
39
40 struct rds_ib_incoming {
41         struct list_head        ii_frags;
42         struct list_head        ii_cache_entry;
43         struct rds_incoming     ii_inc;
44 };
45
46 struct rds_ib_cache_head {
47         struct list_head *first;
48         unsigned long count;
49 };
50
51 struct rds_ib_refill_cache {
52         struct rds_ib_cache_head *percpu;
53         struct list_head         *xfer;
54         struct list_head         *ready;
55 };
56
57 struct rds_ib_connect_private {
58         /* Add new fields at the end, and don't permute existing fields. */
59         __be32                  dp_saddr;
60         __be32                  dp_daddr;
61         u8                      dp_protocol_major;
62         u8                      dp_protocol_minor;
63         __be16                  dp_protocol_minor_mask; /* bitmask */
64         __be32                  dp_reserved1;
65         __be64                  dp_ack_seq;
66         __be32                  dp_credit;              /* non-zero enables flow ctl */
67 };
68
69 struct rds_ib_send_work {
70         void                    *s_op;
71         struct ib_send_wr       s_wr;
72         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
73         unsigned long           s_queued;
74 };
75
76 struct rds_ib_recv_work {
77         struct rds_ib_incoming  *r_ibinc;
78         struct rds_page_frag    *r_frag;
79         struct ib_recv_wr       r_wr;
80         struct ib_sge           r_sge[2];
81 };
82
83 struct rds_ib_work_ring {
84         u32             w_nr;
85         u32             w_alloc_ptr;
86         u32             w_alloc_ctr;
87         u32             w_free_ptr;
88         atomic_t        w_free_ctr;
89 };
90
91 struct rds_ib_device;
92
93 struct rds_ib_connection {
94
95         struct list_head        ib_node;
96         struct rds_ib_device    *rds_ibdev;
97         struct rds_connection   *conn;
98
99         /* alphabet soup, IBTA style */
100         struct rdma_cm_id       *i_cm_id;
101         struct ib_pd            *i_pd;
102         struct ib_mr            *i_mr;
103         struct ib_cq            *i_send_cq;
104         struct ib_cq            *i_recv_cq;
105
106         /* tx */
107         struct rds_ib_work_ring i_send_ring;
108         struct rm_data_op       *i_data_op;
109         struct rds_header       *i_send_hdrs;
110         u64                     i_send_hdrs_dma;
111         struct rds_ib_send_work *i_sends;
112         atomic_t                i_signaled_sends;
113
114         /* rx */
115         struct tasklet_struct   i_recv_tasklet;
116         struct mutex            i_recv_mutex;
117         struct rds_ib_work_ring i_recv_ring;
118         struct rds_ib_incoming  *i_ibinc;
119         u32                     i_recv_data_rem;
120         struct rds_header       *i_recv_hdrs;
121         u64                     i_recv_hdrs_dma;
122         struct rds_ib_recv_work *i_recvs;
123         u64                     i_ack_recv;     /* last ACK received */
124         struct rds_ib_refill_cache i_cache_incs;
125         struct rds_ib_refill_cache i_cache_frags;
126
127         /* sending acks */
128         unsigned long           i_ack_flags;
129 #ifdef KERNEL_HAS_ATOMIC64
130         atomic64_t              i_ack_next;     /* next ACK to send */
131 #else
132         spinlock_t              i_ack_lock;     /* protect i_ack_next */
133         u64                     i_ack_next;     /* next ACK to send */
134 #endif
135         struct rds_header       *i_ack;
136         struct ib_send_wr       i_ack_wr;
137         struct ib_sge           i_ack_sge;
138         u64                     i_ack_dma;
139         unsigned long           i_ack_queued;
140
141         /* Flow control related information
142          *
143          * Our algorithm uses a pair variables that we need to access
144          * atomically - one for the send credits, and one posted
145          * recv credits we need to transfer to remote.
146          * Rather than protect them using a slow spinlock, we put both into
147          * a single atomic_t and update it using cmpxchg
148          */
149         atomic_t                i_credits;
150
151         /* Protocol version specific information */
152         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
153
154         /* Batched completions */
155         unsigned int            i_unsignaled_wrs;
156 };
157
158 /* This assumes that atomic_t is at least 32 bits */
159 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
160 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
161 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
162 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
163
164 struct rds_ib_ipaddr {
165         struct list_head        list;
166         __be32                  ipaddr;
167 };
168
169 struct rds_ib_device {
170         struct list_head        list;
171         struct list_head        ipaddr_list;
172         struct list_head        conn_list;
173         struct ib_device        *dev;
174         struct ib_pd            *pd;
175         struct ib_mr            *mr;
176         struct rds_ib_mr_pool   *mr_pool;
177         unsigned int            fmr_max_remaps;
178         unsigned int            max_fmrs;
179         int                     max_sge;
180         unsigned int            max_wrs;
181         unsigned int            max_initiator_depth;
182         unsigned int            max_responder_resources;
183         spinlock_t              spinlock;       /* protect the above */
184         atomic_t                refcount;
185         struct work_struct      free_work;
186 };
187
188 #define pcidev_to_node(pcidev) pcibus_to_node(pcidev->bus)
189 #define ibdev_to_node(ibdev) pcidev_to_node(to_pci_dev(ibdev->dma_device))
190 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
191
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;
227         uint64_t        s_ib_atomic_cswp;
228         uint64_t        s_ib_atomic_fadd;
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,
238                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
239 {
240         unsigned int i;
241
242         for (i = 0; i < sg_dma_len; ++i) {
243                 ib_dma_sync_single_for_cpu(dev,
244                                 ib_sg_dma_address(dev, &sg[i]),
245                                 ib_sg_dma_len(dev, &sg[i]),
246                                 direction);
247         }
248 }
249 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
250
251 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
252                 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
253 {
254         unsigned int i;
255
256         for (i = 0; i < sg_dma_len; ++i) {
257                 ib_dma_sync_single_for_device(dev,
258                                 ib_sg_dma_address(dev, &sg[i]),
259                                 ib_sg_dma_len(dev, &sg[i]),
260                                 direction);
261         }
262 }
263 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
264
265
266 /* ib.c */
267 extern struct rds_transport rds_ib_transport;
268 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
269 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
270 extern struct ib_client rds_ib_client;
271
272 extern unsigned int fmr_message_size;
273 extern unsigned int rds_ib_retry_count;
274
275 extern spinlock_t ib_nodev_conns_lock;
276 extern struct list_head ib_nodev_conns;
277
278 /* ib_cm.c */
279 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
280 void rds_ib_conn_free(void *arg);
281 int rds_ib_conn_connect(struct rds_connection *conn);
282 void rds_ib_conn_shutdown(struct rds_connection *conn);
283 void rds_ib_state_change(struct sock *sk);
284 int rds_ib_listen_init(void);
285 void rds_ib_listen_stop(void);
286 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
287 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
288                              struct rdma_cm_event *event);
289 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
290 void rds_ib_cm_connect_complete(struct rds_connection *conn,
291                                 struct rdma_cm_event *event);
292
293
294 #define rds_ib_conn_error(conn, fmt...) \
295         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
296
297 /* ib_rdma.c */
298 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
299 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
300 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
301 void rds_ib_destroy_nodev_conns(void);
302 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
303 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
304 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
305 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
306                     struct rds_sock *rs, u32 *key_ret);
307 void rds_ib_sync_mr(void *trans_private, int dir);
308 void rds_ib_free_mr(void *trans_private, int invalidate);
309 void rds_ib_flush_mrs(void);
310 int rds_ib_fmr_init(void);
311 void rds_ib_fmr_exit(void);
312
313 /* ib_recv.c */
314 int rds_ib_recv_init(void);
315 void rds_ib_recv_exit(void);
316 int rds_ib_recv(struct rds_connection *conn);
317 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
318 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
319 void rds_ib_recv_refill(struct rds_connection *conn, int prefill);
320 void rds_ib_inc_free(struct rds_incoming *inc);
321 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
322                              size_t size);
323 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
324 void rds_ib_recv_tasklet_fn(unsigned long data);
325 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
326 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
327 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
328 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
329 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
330 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
331
332 /* ib_ring.c */
333 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
334 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
335 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
336 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
337 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
338 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
339 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
340 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
341 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
342 extern wait_queue_head_t rds_ib_ring_empty_wait;
343
344 /* ib_send.c */
345 char *rds_ib_wc_status_str(enum ib_wc_status status);
346 void rds_ib_xmit_complete(struct rds_connection *conn);
347 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
348                 unsigned int hdr_off, unsigned int sg, unsigned int off);
349 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
350 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
351 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
352 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
353 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
354 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
355 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
356                              u32 *adv_credits, int need_posted, int max_posted);
357 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
358
359 /* ib_stats.c */
360 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
361 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
362 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
363                                     unsigned int avail);
364
365 /* ib_sysctl.c */
366 int rds_ib_sysctl_init(void);
367 void rds_ib_sysctl_exit(void);
368 extern unsigned long rds_ib_sysctl_max_send_wr;
369 extern unsigned long rds_ib_sysctl_max_recv_wr;
370 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
371 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
372 extern unsigned long rds_ib_sysctl_max_recv_allocation;
373 extern unsigned int rds_ib_sysctl_flow_control;
374
375 #endif