drm/amdgpu/vg20:Restruct uvd to support multiple uvds
[muen/linux.git] / net / rds / ib.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _RDS_IB_H
3 #define _RDS_IB_H
4
5 #include <rdma/ib_verbs.h>
6 #include <rdma/rdma_cm.h>
7 #include <linux/interrupt.h>
8 #include <linux/pci.h>
9 #include <linux/slab.h>
10 #include "rds.h"
11 #include "rdma_transport.h"
12
13 #define RDS_IB_MAX_SGE                  8
14 #define RDS_IB_RECV_SGE                 2
15
16 #define RDS_IB_DEFAULT_RECV_WR          1024
17 #define RDS_IB_DEFAULT_SEND_WR          256
18 #define RDS_IB_DEFAULT_FR_WR            256
19 #define RDS_IB_DEFAULT_FR_INV_WR        256
20
21 #define RDS_IB_DEFAULT_RETRY_COUNT      1
22
23 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
24
25 #define RDS_IB_RECYCLE_BATCH_COUNT      32
26
27 #define RDS_IB_WC_MAX                   32
28
29 extern struct rw_semaphore rds_ib_devices_lock;
30 extern struct list_head rds_ib_devices;
31
32 /*
33  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
34  * try and minimize the amount of memory tied up both the device and
35  * socket receive queues.
36  */
37 struct rds_page_frag {
38         struct list_head        f_item;
39         struct list_head        f_cache_entry;
40         struct scatterlist      f_sg;
41 };
42
43 struct rds_ib_incoming {
44         struct list_head        ii_frags;
45         struct list_head        ii_cache_entry;
46         struct rds_incoming     ii_inc;
47 };
48
49 struct rds_ib_cache_head {
50         struct list_head *first;
51         unsigned long count;
52 };
53
54 struct rds_ib_refill_cache {
55         struct rds_ib_cache_head __percpu *percpu;
56         struct list_head         *xfer;
57         struct list_head         *ready;
58 };
59
60 struct rds_ib_connect_private {
61         /* Add new fields at the end, and don't permute existing fields. */
62         __be32                  dp_saddr;
63         __be32                  dp_daddr;
64         u8                      dp_protocol_major;
65         u8                      dp_protocol_minor;
66         __be16                  dp_protocol_minor_mask; /* bitmask */
67         __be32                  dp_reserved1;
68         __be64                  dp_ack_seq;
69         __be32                  dp_credit;              /* non-zero enables flow ctl */
70 };
71
72 struct rds_ib_send_work {
73         void                    *s_op;
74         union {
75                 struct ib_send_wr       s_wr;
76                 struct ib_rdma_wr       s_rdma_wr;
77                 struct ib_atomic_wr     s_atomic_wr;
78         };
79         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
80         unsigned long           s_queued;
81 };
82
83 struct rds_ib_recv_work {
84         struct rds_ib_incoming  *r_ibinc;
85         struct rds_page_frag    *r_frag;
86         struct ib_recv_wr       r_wr;
87         struct ib_sge           r_sge[2];
88 };
89
90 struct rds_ib_work_ring {
91         u32             w_nr;
92         u32             w_alloc_ptr;
93         u32             w_alloc_ctr;
94         u32             w_free_ptr;
95         atomic_t        w_free_ctr;
96 };
97
98 /* Rings are posted with all the allocations they'll need to queue the
99  * incoming message to the receiving socket so this can't fail.
100  * All fragments start with a header, so we can make sure we're not receiving
101  * garbage, and we can tell a small 8 byte fragment from an ACK frame.
102  */
103 struct rds_ib_ack_state {
104         u64             ack_next;
105         u64             ack_recv;
106         unsigned int    ack_required:1;
107         unsigned int    ack_next_valid:1;
108         unsigned int    ack_recv_valid:1;
109 };
110
111
112 struct rds_ib_device;
113
114 struct rds_ib_connection {
115
116         struct list_head        ib_node;
117         struct rds_ib_device    *rds_ibdev;
118         struct rds_connection   *conn;
119
120         /* alphabet soup, IBTA style */
121         struct rdma_cm_id       *i_cm_id;
122         struct ib_pd            *i_pd;
123         struct ib_cq            *i_send_cq;
124         struct ib_cq            *i_recv_cq;
125         struct ib_wc            i_send_wc[RDS_IB_WC_MAX];
126         struct ib_wc            i_recv_wc[RDS_IB_WC_MAX];
127
128         /* To control the number of wrs from fastreg */
129         atomic_t                i_fastreg_wrs;
130         atomic_t                i_fastunreg_wrs;
131
132         /* interrupt handling */
133         struct tasklet_struct   i_send_tasklet;
134         struct tasklet_struct   i_recv_tasklet;
135
136         /* tx */
137         struct rds_ib_work_ring i_send_ring;
138         struct rm_data_op       *i_data_op;
139         struct rds_header       *i_send_hdrs;
140         dma_addr_t              i_send_hdrs_dma;
141         struct rds_ib_send_work *i_sends;
142         atomic_t                i_signaled_sends;
143
144         /* rx */
145         struct mutex            i_recv_mutex;
146         struct rds_ib_work_ring i_recv_ring;
147         struct rds_ib_incoming  *i_ibinc;
148         u32                     i_recv_data_rem;
149         struct rds_header       *i_recv_hdrs;
150         dma_addr_t              i_recv_hdrs_dma;
151         struct rds_ib_recv_work *i_recvs;
152         u64                     i_ack_recv;     /* last ACK received */
153         struct rds_ib_refill_cache i_cache_incs;
154         struct rds_ib_refill_cache i_cache_frags;
155         atomic_t                i_cache_allocs;
156
157         /* sending acks */
158         unsigned long           i_ack_flags;
159 #ifdef KERNEL_HAS_ATOMIC64
160         atomic64_t              i_ack_next;     /* next ACK to send */
161 #else
162         spinlock_t              i_ack_lock;     /* protect i_ack_next */
163         u64                     i_ack_next;     /* next ACK to send */
164 #endif
165         struct rds_header       *i_ack;
166         struct ib_send_wr       i_ack_wr;
167         struct ib_sge           i_ack_sge;
168         dma_addr_t              i_ack_dma;
169         unsigned long           i_ack_queued;
170
171         /* Flow control related information
172          *
173          * Our algorithm uses a pair variables that we need to access
174          * atomically - one for the send credits, and one posted
175          * recv credits we need to transfer to remote.
176          * Rather than protect them using a slow spinlock, we put both into
177          * a single atomic_t and update it using cmpxchg
178          */
179         atomic_t                i_credits;
180
181         /* Protocol version specific information */
182         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
183
184         /* Batched completions */
185         unsigned int            i_unsignaled_wrs;
186
187         /* Endpoint role in connection */
188         bool                    i_active_side;
189         atomic_t                i_cq_quiesce;
190
191         /* Send/Recv vectors */
192         int                     i_scq_vector;
193         int                     i_rcq_vector;
194 };
195
196 /* This assumes that atomic_t is at least 32 bits */
197 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
198 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
199 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
200 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
201
202 struct rds_ib_ipaddr {
203         struct list_head        list;
204         __be32                  ipaddr;
205         struct rcu_head         rcu;
206 };
207
208 enum {
209         RDS_IB_MR_8K_POOL,
210         RDS_IB_MR_1M_POOL,
211 };
212
213 struct rds_ib_device {
214         struct list_head        list;
215         struct list_head        ipaddr_list;
216         struct list_head        conn_list;
217         struct ib_device        *dev;
218         struct ib_pd            *pd;
219         bool                    use_fastreg;
220
221         unsigned int            max_mrs;
222         struct rds_ib_mr_pool   *mr_1m_pool;
223         struct rds_ib_mr_pool   *mr_8k_pool;
224         unsigned int            fmr_max_remaps;
225         unsigned int            max_8k_mrs;
226         unsigned int            max_1m_mrs;
227         int                     max_sge;
228         unsigned int            max_wrs;
229         unsigned int            max_initiator_depth;
230         unsigned int            max_responder_resources;
231         spinlock_t              spinlock;       /* protect the above */
232         refcount_t              refcount;
233         struct work_struct      free_work;
234         int                     *vector_load;
235 };
236
237 #define ibdev_to_node(ibdev) dev_to_node((ibdev)->dev.parent)
238 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
239
240 /* bits for i_ack_flags */
241 #define IB_ACK_IN_FLIGHT        0
242 #define IB_ACK_REQUESTED        1
243
244 /* Magic WR_ID for ACKs */
245 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
246
247 struct rds_ib_statistics {
248         uint64_t        s_ib_connect_raced;
249         uint64_t        s_ib_listen_closed_stale;
250         uint64_t        s_ib_evt_handler_call;
251         uint64_t        s_ib_tasklet_call;
252         uint64_t        s_ib_tx_cq_event;
253         uint64_t        s_ib_tx_ring_full;
254         uint64_t        s_ib_tx_throttle;
255         uint64_t        s_ib_tx_sg_mapping_failure;
256         uint64_t        s_ib_tx_stalled;
257         uint64_t        s_ib_tx_credit_updates;
258         uint64_t        s_ib_rx_cq_event;
259         uint64_t        s_ib_rx_ring_empty;
260         uint64_t        s_ib_rx_refill_from_cq;
261         uint64_t        s_ib_rx_refill_from_thread;
262         uint64_t        s_ib_rx_alloc_limit;
263         uint64_t        s_ib_rx_total_frags;
264         uint64_t        s_ib_rx_total_incs;
265         uint64_t        s_ib_rx_credit_updates;
266         uint64_t        s_ib_ack_sent;
267         uint64_t        s_ib_ack_send_failure;
268         uint64_t        s_ib_ack_send_delayed;
269         uint64_t        s_ib_ack_send_piggybacked;
270         uint64_t        s_ib_ack_received;
271         uint64_t        s_ib_rdma_mr_8k_alloc;
272         uint64_t        s_ib_rdma_mr_8k_free;
273         uint64_t        s_ib_rdma_mr_8k_used;
274         uint64_t        s_ib_rdma_mr_8k_pool_flush;
275         uint64_t        s_ib_rdma_mr_8k_pool_wait;
276         uint64_t        s_ib_rdma_mr_8k_pool_depleted;
277         uint64_t        s_ib_rdma_mr_1m_alloc;
278         uint64_t        s_ib_rdma_mr_1m_free;
279         uint64_t        s_ib_rdma_mr_1m_used;
280         uint64_t        s_ib_rdma_mr_1m_pool_flush;
281         uint64_t        s_ib_rdma_mr_1m_pool_wait;
282         uint64_t        s_ib_rdma_mr_1m_pool_depleted;
283         uint64_t        s_ib_rdma_mr_8k_reused;
284         uint64_t        s_ib_rdma_mr_1m_reused;
285         uint64_t        s_ib_atomic_cswp;
286         uint64_t        s_ib_atomic_fadd;
287         uint64_t        s_ib_recv_added_to_cache;
288         uint64_t        s_ib_recv_removed_from_cache;
289 };
290
291 extern struct workqueue_struct *rds_ib_wq;
292
293 /*
294  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
295  * doesn't define it.
296  */
297 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
298                                               struct scatterlist *sglist,
299                                               unsigned int sg_dma_len,
300                                               int direction)
301 {
302         struct scatterlist *sg;
303         unsigned int i;
304
305         for_each_sg(sglist, sg, sg_dma_len, i) {
306                 ib_dma_sync_single_for_cpu(dev,
307                                 ib_sg_dma_address(dev, sg),
308                                 ib_sg_dma_len(dev, sg),
309                                 direction);
310         }
311 }
312 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
313
314 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
315                                                  struct scatterlist *sglist,
316                                                  unsigned int sg_dma_len,
317                                                  int direction)
318 {
319         struct scatterlist *sg;
320         unsigned int i;
321
322         for_each_sg(sglist, sg, sg_dma_len, i) {
323                 ib_dma_sync_single_for_device(dev,
324                                 ib_sg_dma_address(dev, sg),
325                                 ib_sg_dma_len(dev, sg),
326                                 direction);
327         }
328 }
329 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
330
331
332 /* ib.c */
333 extern struct rds_transport rds_ib_transport;
334 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
335 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
336 extern struct ib_client rds_ib_client;
337
338 extern unsigned int rds_ib_retry_count;
339
340 extern spinlock_t ib_nodev_conns_lock;
341 extern struct list_head ib_nodev_conns;
342
343 /* ib_cm.c */
344 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
345 void rds_ib_conn_free(void *arg);
346 int rds_ib_conn_path_connect(struct rds_conn_path *cp);
347 void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
348 void rds_ib_state_change(struct sock *sk);
349 int rds_ib_listen_init(void);
350 void rds_ib_listen_stop(void);
351 __printf(2, 3)
352 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
353 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
354                              struct rdma_cm_event *event);
355 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
356 void rds_ib_cm_connect_complete(struct rds_connection *conn,
357                                 struct rdma_cm_event *event);
358
359
360 #define rds_ib_conn_error(conn, fmt...) \
361         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
362
363 /* ib_rdma.c */
364 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
365 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
366 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
367 void rds_ib_destroy_nodev_conns(void);
368 void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
369
370 /* ib_recv.c */
371 int rds_ib_recv_init(void);
372 void rds_ib_recv_exit(void);
373 int rds_ib_recv_path(struct rds_conn_path *conn);
374 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
375 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
376 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
377 void rds_ib_inc_free(struct rds_incoming *inc);
378 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
379 void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
380                              struct rds_ib_ack_state *state);
381 void rds_ib_recv_tasklet_fn(unsigned long data);
382 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
383 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
384 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
385 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
386 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
387 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
388 void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
389
390 /* ib_ring.c */
391 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
392 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
393 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
394 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
395 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
396 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
397 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
398 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
399 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
400 extern wait_queue_head_t rds_ib_ring_empty_wait;
401
402 /* ib_send.c */
403 void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
404 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
405                 unsigned int hdr_off, unsigned int sg, unsigned int off);
406 void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
407 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
408 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
409 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
410 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
411 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
412 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
413                              u32 *adv_credits, int need_posted, int max_posted);
414 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
415
416 /* ib_stats.c */
417 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
418 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
419 #define rds_ib_stats_add(member, count) \
420                 rds_stats_add_which(rds_ib_stats, member, count)
421 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
422                                     unsigned int avail);
423
424 /* ib_sysctl.c */
425 int rds_ib_sysctl_init(void);
426 void rds_ib_sysctl_exit(void);
427 extern unsigned long rds_ib_sysctl_max_send_wr;
428 extern unsigned long rds_ib_sysctl_max_recv_wr;
429 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
430 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
431 extern unsigned long rds_ib_sysctl_max_recv_allocation;
432 extern unsigned int rds_ib_sysctl_flow_control;
433
434 #endif