tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
28extern struct rw_semaphore rds_ib_devices_lock;
29extern 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 */
36struct rds_page_frag {
37 struct list_head f_item;
38 struct list_head f_cache_entry;
39 struct scatterlist f_sg;
40};
41
42struct rds_ib_incoming {
43 struct list_head ii_frags;
44 struct list_head ii_cache_entry;
45 struct rds_incoming ii_inc;
46};
47
48struct rds_ib_cache_head {
49 struct list_head *first;
50 unsigned long count;
51};
52
53struct rds_ib_refill_cache {
54 struct rds_ib_cache_head __percpu *percpu;
55 struct list_head *xfer;
56 struct list_head *ready;
57};
58
59struct 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
71struct 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
82struct 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
89struct 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 */
102struct 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
111struct rds_ib_device;
112
113struct 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
201struct rds_ib_ipaddr {
202 struct list_head list;
203 __be32 ipaddr;
204 struct rcu_head rcu;
205};
206
207enum {
208 RDS_IB_MR_8K_POOL,
209 RDS_IB_MR_1M_POOL,
210};
211
212struct 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
248struct 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
292extern 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 */
298static 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
315static 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 */
334extern struct rds_transport rds_ib_transport;
335struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
336void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
337extern struct ib_client rds_ib_client;
338
339extern unsigned int rds_ib_retry_count;
340
341extern spinlock_t ib_nodev_conns_lock;
342extern struct list_head ib_nodev_conns;
343
344/* ib_cm.c */
345int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
346void rds_ib_conn_free(void *arg);
347int rds_ib_conn_path_connect(struct rds_conn_path *cp);
348void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
349void rds_ib_state_change(struct sock *sk);
350int rds_ib_listen_init(void);
351void rds_ib_listen_stop(void);
352__printf(2, 3)
353void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
354int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
355 struct rdma_cm_event *event);
356int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
357void 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 */
365int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
366void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
367void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
368void rds_ib_destroy_nodev_conns(void);
369void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
370
371/* ib_recv.c */
372int rds_ib_recv_init(void);
373void rds_ib_recv_exit(void);
374int rds_ib_recv_path(struct rds_conn_path *conn);
375int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
376void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
377void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
378void rds_ib_inc_free(struct rds_incoming *inc);
379int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
380void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
381 struct rds_ib_ack_state *state);
382void rds_ib_recv_tasklet_fn(unsigned long data);
383void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
384void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
385void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
386void rds_ib_attempt_ack(struct rds_ib_connection *ic);
387void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
388u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
389void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
390
391/* ib_ring.c */
392void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
393void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
394u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
395void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
396void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
397int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
398int rds_ib_ring_low(struct rds_ib_work_ring *ring);
399u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
400u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
401extern wait_queue_head_t rds_ib_ring_empty_wait;
402
403/* ib_send.c */
404void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
405int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
406 unsigned int hdr_off, unsigned int sg, unsigned int off);
407void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
408void rds_ib_send_init_ring(struct rds_ib_connection *ic);
409void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
410int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
411void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
412void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
413int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
414 u32 *adv_credits, int need_posted, int max_posted);
415int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
416
417/* ib_stats.c */
418DECLARE_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)
422unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
423 unsigned int avail);
424
425/* ib_sysctl.c */
426int rds_ib_sysctl_init(void);
427void rds_ib_sysctl_exit(void);
428extern unsigned long rds_ib_sysctl_max_send_wr;
429extern unsigned long rds_ib_sysctl_max_recv_wr;
430extern unsigned long rds_ib_sysctl_max_unsig_wrs;
431extern unsigned long rds_ib_sysctl_max_unsig_bytes;
432extern unsigned long rds_ib_sysctl_max_recv_allocation;
433extern unsigned int rds_ib_sysctl_flow_control;
434
435#endif