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 */
rds_ib_dma_sync_sg_for_cpu(struct ib_device * dev,struct scatterlist * sg,unsigned int sg_dma_len,int direction)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
rds_ib_dma_sync_sg_for_device(struct ib_device * dev,struct scatterlist * sg,unsigned int sg_dma_len,int direction)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
311 /* ib_recv.c */
312 int rds_ib_recv_init(void);
313 void rds_ib_recv_exit(void);
314 int rds_ib_recv(struct rds_connection *conn);
315 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
316 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
317 void rds_ib_recv_refill(struct rds_connection *conn, int prefill);
318 void rds_ib_inc_free(struct rds_incoming *inc);
319 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
320 size_t size);
321 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
322 void rds_ib_recv_tasklet_fn(unsigned long data);
323 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
324 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
325 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
326 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
327 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
328 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
329
330 /* ib_ring.c */
331 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
332 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
333 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
334 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
335 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
336 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
337 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
338 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
339 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
340 extern wait_queue_head_t rds_ib_ring_empty_wait;
341
342 /* ib_send.c */
343 char *rds_ib_wc_status_str(enum ib_wc_status status);
344 void rds_ib_xmit_complete(struct rds_connection *conn);
345 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
346 unsigned int hdr_off, unsigned int sg, unsigned int off);
347 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
348 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
349 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
350 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
351 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
352 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
353 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
354 u32 *adv_credits, int need_posted, int max_posted);
355 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
356
357 /* ib_stats.c */
358 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
359 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
360 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
361 unsigned int avail);
362
363 /* ib_sysctl.c */
364 int rds_ib_sysctl_init(void);
365 void rds_ib_sysctl_exit(void);
366 extern unsigned long rds_ib_sysctl_max_send_wr;
367 extern unsigned long rds_ib_sysctl_max_recv_wr;
368 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
369 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
370 extern unsigned long rds_ib_sysctl_max_recv_allocation;
371 extern unsigned int rds_ib_sysctl_flow_control;
372
373 #endif
374