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