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TOMOYO Linux Cross Reference
Linux/net/rds/ib.h

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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 <linux/interrupt.h>
  7 #include <linux/pci.h>
  8 #include <linux/slab.h>
  9 #include "rds.h"
 10 #include "rdma_transport.h"
 11 
 12 #define RDS_FMR_SIZE                    256
 13 #define RDS_FMR_POOL_SIZE               8192
 14 
 15 #define RDS_IB_MAX_SGE                  8
 16 #define RDS_IB_RECV_SGE                 2
 17 
 18 #define RDS_IB_DEFAULT_RECV_WR          1024
 19 #define RDS_IB_DEFAULT_SEND_WR          256
 20 
 21 #define RDS_IB_DEFAULT_RETRY_COUNT      2
 22 
 23 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
 24 
 25 #define RDS_IB_RECYCLE_BATCH_COUNT      32
 26 
 27 extern struct rw_semaphore rds_ib_devices_lock;
 28 extern struct list_head rds_ib_devices;
 29 
 30 /*
 31  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
 32  * try and minimize the amount of memory tied up both the device and
 33  * socket receive queues.
 34  */
 35 struct rds_page_frag {
 36         struct list_head        f_item;
 37         struct list_head        f_cache_entry;
 38         struct scatterlist      f_sg;
 39 };
 40 
 41 struct rds_ib_incoming {
 42         struct list_head        ii_frags;
 43         struct list_head        ii_cache_entry;
 44         struct rds_incoming     ii_inc;
 45 };
 46 
 47 struct rds_ib_cache_head {
 48         struct list_head *first;
 49         unsigned long count;
 50 };
 51 
 52 struct rds_ib_refill_cache {
 53         struct rds_ib_cache_head __percpu *percpu;
 54         struct list_head         *xfer;
 55         struct list_head         *ready;
 56 };
 57 
 58 struct rds_ib_connect_private {
 59         /* Add new fields at the end, and don't permute existing fields. */
 60         __be32                  dp_saddr;
 61         __be32                  dp_daddr;
 62         u8                      dp_protocol_major;
 63         u8                      dp_protocol_minor;
 64         __be16                  dp_protocol_minor_mask; /* bitmask */
 65         __be32                  dp_reserved1;
 66         __be64                  dp_ack_seq;
 67         __be32                  dp_credit;              /* non-zero enables flow ctl */
 68 };
 69 
 70 struct rds_ib_send_work {
 71         void                    *s_op;
 72         struct ib_send_wr       s_wr;
 73         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
 74         unsigned long           s_queued;
 75 };
 76 
 77 struct rds_ib_recv_work {
 78         struct rds_ib_incoming  *r_ibinc;
 79         struct rds_page_frag    *r_frag;
 80         struct ib_recv_wr       r_wr;
 81         struct ib_sge           r_sge[2];
 82 };
 83 
 84 struct rds_ib_work_ring {
 85         u32             w_nr;
 86         u32             w_alloc_ptr;
 87         u32             w_alloc_ctr;
 88         u32             w_free_ptr;
 89         atomic_t        w_free_ctr;
 90 };
 91 
 92 struct rds_ib_device;
 93 
 94 struct rds_ib_connection {
 95 
 96         struct list_head        ib_node;
 97         struct rds_ib_device    *rds_ibdev;
 98         struct rds_connection   *conn;
 99 
100         /* alphabet soup, IBTA style */
101         struct rdma_cm_id       *i_cm_id;
102         struct ib_pd            *i_pd;
103         struct ib_mr            *i_mr;
104         struct ib_cq            *i_send_cq;
105         struct ib_cq            *i_recv_cq;
106 
107         /* tx */
108         struct rds_ib_work_ring i_send_ring;
109         struct rm_data_op       *i_data_op;
110         struct rds_header       *i_send_hdrs;
111         u64                     i_send_hdrs_dma;
112         struct rds_ib_send_work *i_sends;
113         atomic_t                i_signaled_sends;
114 
115         /* rx */
116         struct tasklet_struct   i_recv_tasklet;
117         struct mutex            i_recv_mutex;
118         struct rds_ib_work_ring i_recv_ring;
119         struct rds_ib_incoming  *i_ibinc;
120         u32                     i_recv_data_rem;
121         struct rds_header       *i_recv_hdrs;
122         u64                     i_recv_hdrs_dma;
123         struct rds_ib_recv_work *i_recvs;
124         u64                     i_ack_recv;     /* last ACK received */
125         struct rds_ib_refill_cache i_cache_incs;
126         struct rds_ib_refill_cache i_cache_frags;
127 
128         /* sending acks */
129         unsigned long           i_ack_flags;
130 #ifdef KERNEL_HAS_ATOMIC64
131         atomic64_t              i_ack_next;     /* next ACK to send */
132 #else
133         spinlock_t              i_ack_lock;     /* protect i_ack_next */
134         u64                     i_ack_next;     /* next ACK to send */
135 #endif
136         struct rds_header       *i_ack;
137         struct ib_send_wr       i_ack_wr;
138         struct ib_sge           i_ack_sge;
139         u64                     i_ack_dma;
140         unsigned long           i_ack_queued;
141 
142         /* Flow control related information
143          *
144          * Our algorithm uses a pair variables that we need to access
145          * atomically - one for the send credits, and one posted
146          * recv credits we need to transfer to remote.
147          * Rather than protect them using a slow spinlock, we put both into
148          * a single atomic_t and update it using cmpxchg
149          */
150         atomic_t                i_credits;
151 
152         /* Protocol version specific information */
153         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
154 
155         /* Batched completions */
156         unsigned int            i_unsignaled_wrs;
157 };
158 
159 /* This assumes that atomic_t is at least 32 bits */
160 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
161 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
162 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
163 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
164 
165 struct rds_ib_ipaddr {
166         struct list_head        list;
167         __be32                  ipaddr;
168 };
169 
170 struct rds_ib_device {
171         struct list_head        list;
172         struct list_head        ipaddr_list;
173         struct list_head        conn_list;
174         struct ib_device        *dev;
175         struct ib_pd            *pd;
176         struct ib_mr            *mr;
177         struct rds_ib_mr_pool   *mr_pool;
178         unsigned int            fmr_max_remaps;
179         unsigned int            max_fmrs;
180         int                     max_sge;
181         unsigned int            max_wrs;
182         unsigned int            max_initiator_depth;
183         unsigned int            max_responder_resources;
184         spinlock_t              spinlock;       /* protect the above */
185         atomic_t                refcount;
186         struct work_struct      free_work;
187 };
188 
189 #define ibdev_to_node(ibdev) dev_to_node(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 
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 

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