RDS/IW+IB: Allow max credit advertise window.
[linux-2.6.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 "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_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
19
20 extern struct list_head rds_ib_devices;
21
22 /*
23  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
24  * try and minimize the amount of memory tied up both the device and
25  * socket receive queues.
26  */
27 /* page offset of the final full frag that fits in the page */
28 #define RDS_PAGE_LAST_OFF (((PAGE_SIZE  / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
29 struct rds_page_frag {
30         struct list_head        f_item;
31         struct page             *f_page;
32         unsigned long           f_offset;
33         dma_addr_t              f_mapped;
34 };
35
36 struct rds_ib_incoming {
37         struct list_head        ii_frags;
38         struct rds_incoming     ii_inc;
39 };
40
41 struct rds_ib_connect_private {
42         /* Add new fields at the end, and don't permute existing fields. */
43         __be32                  dp_saddr;
44         __be32                  dp_daddr;
45         u8                      dp_protocol_major;
46         u8                      dp_protocol_minor;
47         __be16                  dp_protocol_minor_mask; /* bitmask */
48         __be32                  dp_reserved1;
49         __be64                  dp_ack_seq;
50         __be32                  dp_credit;              /* non-zero enables flow ctl */
51 };
52
53 struct rds_ib_send_work {
54         struct rds_message      *s_rm;
55         struct rds_rdma_op      *s_op;
56         struct ib_send_wr       s_wr;
57         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
58         unsigned long           s_queued;
59 };
60
61 struct rds_ib_recv_work {
62         struct rds_ib_incoming  *r_ibinc;
63         struct rds_page_frag    *r_frag;
64         struct ib_recv_wr       r_wr;
65         struct ib_sge           r_sge[2];
66 };
67
68 struct rds_ib_work_ring {
69         u32             w_nr;
70         u32             w_alloc_ptr;
71         u32             w_alloc_ctr;
72         u32             w_free_ptr;
73         atomic_t        w_free_ctr;
74 };
75
76 struct rds_ib_device;
77
78 struct rds_ib_connection {
79
80         struct list_head        ib_node;
81         struct rds_ib_device    *rds_ibdev;
82         struct rds_connection   *conn;
83
84         /* alphabet soup, IBTA style */
85         struct rdma_cm_id       *i_cm_id;
86         struct ib_pd            *i_pd;
87         struct ib_mr            *i_mr;
88         struct ib_cq            *i_send_cq;
89         struct ib_cq            *i_recv_cq;
90
91         /* tx */
92         struct rds_ib_work_ring i_send_ring;
93         struct rds_message      *i_rm;
94         struct rds_header       *i_send_hdrs;
95         u64                     i_send_hdrs_dma;
96         struct rds_ib_send_work *i_sends;
97
98         /* rx */
99         struct mutex            i_recv_mutex;
100         struct rds_ib_work_ring i_recv_ring;
101         struct rds_ib_incoming  *i_ibinc;
102         u32                     i_recv_data_rem;
103         struct rds_header       *i_recv_hdrs;
104         u64                     i_recv_hdrs_dma;
105         struct rds_ib_recv_work *i_recvs;
106         struct rds_page_frag    i_frag;
107         u64                     i_ack_recv;     /* last ACK received */
108
109         /* sending acks */
110         unsigned long           i_ack_flags;
111 #ifdef KERNEL_HAS_ATOMIC64
112         atomic64_t              i_ack_next;     /* next ACK to send */
113 #else
114         spinlock_t              i_ack_lock;     /* protect i_ack_next */
115         u64                     i_ack_next;     /* next ACK to send */
116 #endif
117         struct rds_header       *i_ack;
118         struct ib_send_wr       i_ack_wr;
119         struct ib_sge           i_ack_sge;
120         u64                     i_ack_dma;
121         unsigned long           i_ack_queued;
122
123         /* Flow control related information
124          *
125          * Our algorithm uses a pair variables that we need to access
126          * atomically - one for the send credits, and one posted
127          * recv credits we need to transfer to remote.
128          * Rather than protect them using a slow spinlock, we put both into
129          * a single atomic_t and update it using cmpxchg
130          */
131         atomic_t                i_credits;
132
133         /* Protocol version specific information */
134         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
135
136         /* Batched completions */
137         unsigned int            i_unsignaled_wrs;
138         long                    i_unsignaled_bytes;
139 };
140
141 /* This assumes that atomic_t is at least 32 bits */
142 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
143 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
144 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
145 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
146
147 struct rds_ib_ipaddr {
148         struct list_head        list;
149         __be32                  ipaddr;
150 };
151
152 struct rds_ib_device {
153         struct list_head        list;
154         struct list_head        ipaddr_list;
155         struct list_head        conn_list;
156         struct ib_device        *dev;
157         struct ib_pd            *pd;
158         struct ib_mr            *mr;
159         struct rds_ib_mr_pool   *mr_pool;
160         int                     fmr_page_shift;
161         int                     fmr_page_size;
162         u64                     fmr_page_mask;
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
251 extern spinlock_t ib_nodev_conns_lock;
252 extern struct list_head ib_nodev_conns;
253
254 /* ib_cm.c */
255 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
256 void rds_ib_conn_free(void *arg);
257 int rds_ib_conn_connect(struct rds_connection *conn);
258 void rds_ib_conn_shutdown(struct rds_connection *conn);
259 void rds_ib_state_change(struct sock *sk);
260 int __init rds_ib_listen_init(void);
261 void rds_ib_listen_stop(void);
262 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
263 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
264                              struct rdma_cm_event *event);
265 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
266 void rds_ib_cm_connect_complete(struct rds_connection *conn,
267                                 struct rdma_cm_event *event);
268
269
270 #define rds_ib_conn_error(conn, fmt...) \
271         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
272
273 /* ib_rdma.c */
274 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
275 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
276 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
277 void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
278 static inline void rds_ib_destroy_nodev_conns(void)
279 {
280         __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
281 }
282 static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
283 {
284         __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
285 }
286 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
287 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
288 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
289 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
290                     struct rds_sock *rs, u32 *key_ret);
291 void rds_ib_sync_mr(void *trans_private, int dir);
292 void rds_ib_free_mr(void *trans_private, int invalidate);
293 void rds_ib_flush_mrs(void);
294
295 /* ib_recv.c */
296 int __init rds_ib_recv_init(void);
297 void rds_ib_recv_exit(void);
298 int rds_ib_recv(struct rds_connection *conn);
299 int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
300                        gfp_t page_gfp, int prefill);
301 void rds_ib_inc_purge(struct rds_incoming *inc);
302 void rds_ib_inc_free(struct rds_incoming *inc);
303 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
304                              size_t size);
305 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
306 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
307 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
308 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
309 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
310 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
311 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
312
313 /* ib_ring.c */
314 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
315 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
316 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
317 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
318 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
319 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
320 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
321 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
322 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
323 extern wait_queue_head_t rds_ib_ring_empty_wait;
324
325 /* ib_send.c */
326 void rds_ib_xmit_complete(struct rds_connection *conn);
327 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
328                 unsigned int hdr_off, unsigned int sg, unsigned int off);
329 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
330 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
331 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
332 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
333 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
334 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
335 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
336                              u32 *adv_credits, int need_posted, int max_posted);
337
338 /* ib_stats.c */
339 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
340 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
341 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
342                                     unsigned int avail);
343
344 /* ib_sysctl.c */
345 int __init rds_ib_sysctl_init(void);
346 void rds_ib_sysctl_exit(void);
347 extern unsigned long rds_ib_sysctl_max_send_wr;
348 extern unsigned long rds_ib_sysctl_max_recv_wr;
349 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
350 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
351 extern unsigned long rds_ib_sysctl_max_recv_allocation;
352 extern unsigned int rds_ib_sysctl_flow_control;
353 extern ctl_table rds_ib_sysctl_table[];
354
355 /*
356  * Helper functions for getting/setting the header and data SGEs in
357  * RDS packets (not RDMA)
358  */
359 static inline struct ib_sge *
360 rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
361 {
362         return &sge[0];
363 }
364
365 static inline struct ib_sge *
366 rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
367 {
368         return &sge[1];
369 }
370
371 #endif