spi: bcm-qspi: Fix use after free in bcm_qspi_probe() in error path
[sfrench/cifs-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/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_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 #define RDS_IB_DEFAULT_FR_WR            256
18 #define RDS_IB_DEFAULT_FR_INV_WR        256
19
20 #define RDS_IB_DEFAULT_RETRY_COUNT      1
21
22 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
23
24 #define RDS_IB_RECYCLE_BATCH_COUNT      32
25
26 #define RDS_IB_WC_MAX                   32
27
28 extern struct rw_semaphore rds_ib_devices_lock;
29 extern struct list_head rds_ib_devices;
30
31 /*
32  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
33  * try and minimize the amount of memory tied up both the device and
34  * socket receive queues.
35  */
36 struct rds_page_frag {
37         struct list_head        f_item;
38         struct list_head        f_cache_entry;
39         struct scatterlist      f_sg;
40 };
41
42 struct rds_ib_incoming {
43         struct list_head        ii_frags;
44         struct list_head        ii_cache_entry;
45         struct rds_incoming     ii_inc;
46 };
47
48 struct rds_ib_cache_head {
49         struct list_head *first;
50         unsigned long count;
51 };
52
53 struct rds_ib_refill_cache {
54         struct rds_ib_cache_head __percpu *percpu;
55         struct list_head         *xfer;
56         struct list_head         *ready;
57 };
58
59 struct rds_ib_connect_private {
60         /* Add new fields at the end, and don't permute existing fields. */
61         __be32                  dp_saddr;
62         __be32                  dp_daddr;
63         u8                      dp_protocol_major;
64         u8                      dp_protocol_minor;
65         __be16                  dp_protocol_minor_mask; /* bitmask */
66         __be32                  dp_reserved1;
67         __be64                  dp_ack_seq;
68         __be32                  dp_credit;              /* non-zero enables flow ctl */
69 };
70
71 struct rds_ib_send_work {
72         void                    *s_op;
73         union {
74                 struct ib_send_wr       s_wr;
75                 struct ib_rdma_wr       s_rdma_wr;
76                 struct ib_atomic_wr     s_atomic_wr;
77         };
78         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
79         unsigned long           s_queued;
80 };
81
82 struct rds_ib_recv_work {
83         struct rds_ib_incoming  *r_ibinc;
84         struct rds_page_frag    *r_frag;
85         struct ib_recv_wr       r_wr;
86         struct ib_sge           r_sge[2];
87 };
88
89 struct rds_ib_work_ring {
90         u32             w_nr;
91         u32             w_alloc_ptr;
92         u32             w_alloc_ctr;
93         u32             w_free_ptr;
94         atomic_t        w_free_ctr;
95 };
96
97 /* Rings are posted with all the allocations they'll need to queue the
98  * incoming message to the receiving socket so this can't fail.
99  * All fragments start with a header, so we can make sure we're not receiving
100  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
101  */
102 struct rds_ib_ack_state {
103         u64             ack_next;
104         u64             ack_recv;
105         unsigned int    ack_required:1;
106         unsigned int    ack_next_valid:1;
107         unsigned int    ack_recv_valid:1;
108 };
109
110
111 struct rds_ib_device;
112
113 struct rds_ib_connection {
114
115         struct list_head        ib_node;
116         struct rds_ib_device    *rds_ibdev;
117         struct rds_connection   *conn;
118
119         /* alphabet soup, IBTA style */
120         struct rdma_cm_id       *i_cm_id;
121         struct ib_pd            *i_pd;
122         struct ib_cq            *i_send_cq;
123         struct ib_cq            *i_recv_cq;
124         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
125         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
126
127         /* To control the number of wrs from fastreg */
128         atomic_t                i_fastreg_wrs;
129         atomic_t                i_fastunreg_wrs;
130
131         /* interrupt handling */
132         struct tasklet_struct   i_send_tasklet;
133         struct tasklet_struct   i_recv_tasklet;
134
135         /* tx */
136         struct rds_ib_work_ring i_send_ring;
137         struct rm_data_op       *i_data_op;
138         struct rds_header       *i_send_hdrs;
139         dma_addr_t              i_send_hdrs_dma;
140         struct rds_ib_send_work *i_sends;
141         atomic_t                i_signaled_sends;
142
143         /* rx */
144         struct mutex            i_recv_mutex;
145         struct rds_ib_work_ring i_recv_ring;
146         struct rds_ib_incoming  *i_ibinc;
147         u32                     i_recv_data_rem;
148         struct rds_header       *i_recv_hdrs;
149         dma_addr_t              i_recv_hdrs_dma;
150         struct rds_ib_recv_work *i_recvs;
151         u64                     i_ack_recv;     /* last ACK received */
152         struct rds_ib_refill_cache i_cache_incs;
153         struct rds_ib_refill_cache i_cache_frags;
154         atomic_t                i_cache_allocs;
155
156         /* sending acks */
157         unsigned long           i_ack_flags;
158 #ifdef KERNEL_HAS_ATOMIC64
159         atomic64_t              i_ack_next;     /* next ACK to send */
160 #else
161         spinlock_t              i_ack_lock;     /* protect i_ack_next */
162         u64                     i_ack_next;     /* next ACK to send */
163 #endif
164         struct rds_header       *i_ack;
165         struct ib_send_wr       i_ack_wr;
166         struct ib_sge           i_ack_sge;
167         dma_addr_t              i_ack_dma;
168         unsigned long           i_ack_queued;
169
170         /* Flow control related information
171          *
172          * Our algorithm uses a pair variables that we need to access
173          * atomically - one for the send credits, and one posted
174          * recv credits we need to transfer to remote.
175          * Rather than protect them using a slow spinlock, we put both into
176          * a single atomic_t and update it using cmpxchg
177          */
178         atomic_t                i_credits;
179
180         /* Protocol version specific information */
181         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
182
183         /* Batched completions */
184         unsigned int            i_unsignaled_wrs;
185
186         /* Endpoint role in connection */
187         bool                    i_active_side;
188         atomic_t                i_cq_quiesce;
189
190         /* Send/Recv vectors */
191         int                     i_scq_vector;
192         int                     i_rcq_vector;
193 };
194
195 /* This assumes that atomic_t is at least 32 bits */
196 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
197 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
198 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
199 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
200
201 struct rds_ib_ipaddr {
202         struct list_head        list;
203         __be32                  ipaddr;
204         struct rcu_head         rcu;
205 };
206
207 enum {
208         RDS_IB_MR_8K_POOL,
209         RDS_IB_MR_1M_POOL,
210 };
211
212 struct rds_ib_device {
213         struct list_head        list;
214         struct list_head        ipaddr_list;
215         struct list_head        conn_list;
216         struct ib_device        *dev;
217         struct ib_pd            *pd;
218         bool                    has_fmr;
219         bool                    has_fr;
220         bool                    use_fastreg;
221
222         unsigned int            max_mrs;
223         struct rds_ib_mr_pool   *mr_1m_pool;
224         struct rds_ib_mr_pool   *mr_8k_pool;
225         unsigned int            fmr_max_remaps;
226         unsigned int            max_8k_mrs;
227         unsigned int            max_1m_mrs;
228         int                     max_sge;
229         unsigned int            max_wrs;
230         unsigned int            max_initiator_depth;
231         unsigned int            max_responder_resources;
232         spinlock_t              spinlock;       /* protect the above */
233         refcount_t              refcount;
234         struct work_struct      free_work;
235         int                     *vector_load;
236 };
237
238 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
239 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
240
241 /* bits for i_ack_flags */
242 #define IB_ACK_IN_FLIGHT        0
243 #define IB_ACK_REQUESTED        1
244
245 /* Magic WR_ID for ACKs */
246 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
247
248 struct rds_ib_statistics {
249         uint64_t        s_ib_connect_raced;
250         uint64_t        s_ib_listen_closed_stale;
251         uint64_t        s_ib_evt_handler_call;
252         uint64_t        s_ib_tasklet_call;
253         uint64_t        s_ib_tx_cq_event;
254         uint64_t        s_ib_tx_ring_full;
255         uint64_t        s_ib_tx_throttle;
256         uint64_t        s_ib_tx_sg_mapping_failure;
257         uint64_t        s_ib_tx_stalled;
258         uint64_t        s_ib_tx_credit_updates;
259         uint64_t        s_ib_rx_cq_event;
260         uint64_t        s_ib_rx_ring_empty;
261         uint64_t        s_ib_rx_refill_from_cq;
262         uint64_t        s_ib_rx_refill_from_thread;
263         uint64_t        s_ib_rx_alloc_limit;
264         uint64_t        s_ib_rx_total_frags;
265         uint64_t        s_ib_rx_total_incs;
266         uint64_t        s_ib_rx_credit_updates;
267         uint64_t        s_ib_ack_sent;
268         uint64_t        s_ib_ack_send_failure;
269         uint64_t        s_ib_ack_send_delayed;
270         uint64_t        s_ib_ack_send_piggybacked;
271         uint64_t        s_ib_ack_received;
272         uint64_t        s_ib_rdma_mr_8k_alloc;
273         uint64_t        s_ib_rdma_mr_8k_free;
274         uint64_t        s_ib_rdma_mr_8k_used;
275         uint64_t        s_ib_rdma_mr_8k_pool_flush;
276         uint64_t        s_ib_rdma_mr_8k_pool_wait;
277         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
278         uint64_t        s_ib_rdma_mr_1m_alloc;
279         uint64_t        s_ib_rdma_mr_1m_free;
280         uint64_t        s_ib_rdma_mr_1m_used;
281         uint64_t        s_ib_rdma_mr_1m_pool_flush;
282         uint64_t        s_ib_rdma_mr_1m_pool_wait;
283         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
284         uint64_t        s_ib_rdma_mr_8k_reused;
285         uint64_t        s_ib_rdma_mr_1m_reused;
286         uint64_t        s_ib_atomic_cswp;
287         uint64_t        s_ib_atomic_fadd;
288         uint64_t        s_ib_recv_added_to_cache;
289         uint64_t        s_ib_recv_removed_from_cache;
290 };
291
292 extern struct workqueue_struct *rds_ib_wq;
293
294 /*
295  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
296  * doesn't define it.
297  */
298 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
299                                               struct scatterlist *sglist,
300                                               unsigned int sg_dma_len,
301                                               int direction)
302 {
303         struct scatterlist *sg;
304         unsigned int i;
305
306         for_each_sg(sglist, sg, sg_dma_len, i) {
307                 ib_dma_sync_single_for_cpu(dev,
308                                 ib_sg_dma_address(dev, sg),
309                                 ib_sg_dma_len(dev, sg),
310                                 direction);
311         }
312 }
313 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
314
315 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
316                                                  struct scatterlist *sglist,
317                                                  unsigned int sg_dma_len,
318                                                  int direction)
319 {
320         struct scatterlist *sg;
321         unsigned int i;
322
323         for_each_sg(sglist, sg, sg_dma_len, i) {
324                 ib_dma_sync_single_for_device(dev,
325                                 ib_sg_dma_address(dev, sg),
326                                 ib_sg_dma_len(dev, sg),
327                                 direction);
328         }
329 }
330 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
331
332
333 /* ib.c */
334 extern struct rds_transport rds_ib_transport;
335 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
336 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
337 extern struct ib_client rds_ib_client;
338
339 extern unsigned int rds_ib_retry_count;
340
341 extern spinlock_t ib_nodev_conns_lock;
342 extern struct list_head ib_nodev_conns;
343
344 /* ib_cm.c */
345 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
346 void rds_ib_conn_free(void *arg);
347 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
348 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
349 void rds_ib_state_change(struct sock *sk);
350 int rds_ib_listen_init(void);
351 void rds_ib_listen_stop(void);
352 __printf(2, 3)
353 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
354 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
355                              struct rdma_cm_event *event);
356 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
357 void rds_ib_cm_connect_complete(struct rds_connection *conn,
358                                 struct rdma_cm_event *event);
359
360
361 #define rds_ib_conn_error(conn, fmt...) \
362         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
363
364 /* ib_rdma.c */
365 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
366 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
367 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
368 void rds_ib_destroy_nodev_conns(void);
369 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
370
371 /* ib_recv.c */
372 int rds_ib_recv_init(void);
373 void rds_ib_recv_exit(void);
374 int rds_ib_recv_path(struct rds_conn_path *conn);
375 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
376 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
377 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
378 void rds_ib_inc_free(struct rds_incoming *inc);
379 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
380 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
381                              struct rds_ib_ack_state *state);
382 void rds_ib_recv_tasklet_fn(unsigned long data);
383 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
384 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
385 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
386 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
387 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
388 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
389 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
390
391 /* ib_ring.c */
392 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
393 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
394 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
395 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
396 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
397 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
398 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
399 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
400 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
401 extern wait_queue_head_t rds_ib_ring_empty_wait;
402
403 /* ib_send.c */
404 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
405 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
406                 unsigned int hdr_off, unsigned int sg, unsigned int off);
407 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
408 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
409 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
410 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
411 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
412 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
413 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
414                              u32 *adv_credits, int need_posted, int max_posted);
415 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
416
417 /* ib_stats.c */
418 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
419 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
420 #define rds_ib_stats_add(member, count) \
421                 rds_stats_add_which(rds_ib_stats, member, count)
422 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
423                                     unsigned int avail);
424
425 /* ib_sysctl.c */
426 int rds_ib_sysctl_init(void);
427 void rds_ib_sysctl_exit(void);
428 extern unsigned long rds_ib_sysctl_max_send_wr;
429 extern unsigned long rds_ib_sysctl_max_recv_wr;
430 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
431 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
432 extern unsigned long rds_ib_sysctl_max_recv_allocation;
433 extern unsigned int rds_ib_sysctl_flow_control;
434
435 #endif