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-rw-r--r--net/rds/ib.h367
1 files changed, 367 insertions, 0 deletions
diff --git a/net/rds/ib.h b/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 "rds.h"
7#include "rdma_transport.h"
8
9#define RDS_FMR_SIZE 256
10#define RDS_FMR_POOL_SIZE 4096
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
18#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
19
20extern struct list_head rds_ib_devices;
21
22/*
23 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
24 * try and minimize the amount of memory tied up both the device and
25 * socket receive queues.
26 */
27/* page offset of the final full frag that fits in the page */
28#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
29struct rds_page_frag {
30 struct list_head f_item;
31 struct page *f_page;
32 unsigned long f_offset;
33 dma_addr_t f_mapped;
34};
35
36struct rds_ib_incoming {
37 struct list_head ii_frags;
38 struct rds_incoming ii_inc;
39};
40
41struct rds_ib_connect_private {
42 /* Add new fields at the end, and don't permute existing fields. */
43 __be32 dp_saddr;
44 __be32 dp_daddr;
45 u8 dp_protocol_major;
46 u8 dp_protocol_minor;
47 __be16 dp_protocol_minor_mask; /* bitmask */
48 __be32 dp_reserved1;
49 __be64 dp_ack_seq;
50 __be32 dp_credit; /* non-zero enables flow ctl */
51};
52
53struct rds_ib_send_work {
54 struct rds_message *s_rm;
55 struct rds_rdma_op *s_op;
56 struct ib_send_wr s_wr;
57 struct ib_sge s_sge[RDS_IB_MAX_SGE];
58 unsigned long s_queued;
59};
60
61struct rds_ib_recv_work {
62 struct rds_ib_incoming *r_ibinc;
63 struct rds_page_frag *r_frag;
64 struct ib_recv_wr r_wr;
65 struct ib_sge r_sge[2];
66};
67
68struct rds_ib_work_ring {
69 u32 w_nr;
70 u32 w_alloc_ptr;
71 u32 w_alloc_ctr;
72 u32 w_free_ptr;
73 atomic_t w_free_ctr;
74};
75
76struct rds_ib_device;
77
78struct rds_ib_connection {
79
80 struct list_head ib_node;
81 struct rds_ib_device *rds_ibdev;
82 struct rds_connection *conn;
83
84 /* alphabet soup, IBTA style */
85 struct rdma_cm_id *i_cm_id;
86 struct ib_pd *i_pd;
87 struct ib_mr *i_mr;
88 struct ib_cq *i_send_cq;
89 struct ib_cq *i_recv_cq;
90
91 /* tx */
92 struct rds_ib_work_ring i_send_ring;
93 struct rds_message *i_rm;
94 struct rds_header *i_send_hdrs;
95 u64 i_send_hdrs_dma;
96 struct rds_ib_send_work *i_sends;
97
98 /* rx */
99 struct mutex i_recv_mutex;
100 struct rds_ib_work_ring i_recv_ring;
101 struct rds_ib_incoming *i_ibinc;
102 u32 i_recv_data_rem;
103 struct rds_header *i_recv_hdrs;
104 u64 i_recv_hdrs_dma;
105 struct rds_ib_recv_work *i_recvs;
106 struct rds_page_frag i_frag;
107 u64 i_ack_recv; /* last ACK received */
108
109 /* sending acks */
110 unsigned long i_ack_flags;
111 u64 i_ack_next; /* next ACK to send */
112 struct rds_header *i_ack;
113 struct ib_send_wr i_ack_wr;
114 struct ib_sge i_ack_sge;
115 u64 i_ack_dma;
116 unsigned long i_ack_queued;
117
118 /* Flow control related information
119 *
120 * Our algorithm uses a pair variables that we need to access
121 * atomically - one for the send credits, and one posted
122 * recv credits we need to transfer to remote.
123 * Rather than protect them using a slow spinlock, we put both into
124 * a single atomic_t and update it using cmpxchg
125 */
126 atomic_t i_credits;
127
128 /* Protocol version specific information */
129 unsigned int i_flowctl:1; /* enable/disable flow ctl */
130
131 /* Batched completions */
132 unsigned int i_unsignaled_wrs;
133 long i_unsignaled_bytes;
134};
135
136/* This assumes that atomic_t is at least 32 bits */
137#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
138#define IB_GET_POST_CREDITS(v) ((v) >> 16)
139#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
140#define IB_SET_POST_CREDITS(v) ((v) << 16)
141
142struct rds_ib_ipaddr {
143 struct list_head list;
144 __be32 ipaddr;
145};
146
147struct rds_ib_device {
148 struct list_head list;
149 struct list_head ipaddr_list;
150 struct list_head conn_list;
151 struct ib_device *dev;
152 struct ib_pd *pd;
153 struct ib_mr *mr;
154 struct rds_ib_mr_pool *mr_pool;
155 int fmr_page_shift;
156 int fmr_page_size;
157 u64 fmr_page_mask;
158 unsigned int fmr_max_remaps;
159 unsigned int max_fmrs;
160 int max_sge;
161 unsigned int max_wrs;
162 spinlock_t spinlock; /* protect the above */
163};
164
165/* bits for i_ack_flags */
166#define IB_ACK_IN_FLIGHT 0
167#define IB_ACK_REQUESTED 1
168
169/* Magic WR_ID for ACKs */
170#define RDS_IB_ACK_WR_ID (~(u64) 0)
171
172struct rds_ib_statistics {
173 uint64_t s_ib_connect_raced;
174 uint64_t s_ib_listen_closed_stale;
175 uint64_t s_ib_tx_cq_call;
176 uint64_t s_ib_tx_cq_event;
177 uint64_t s_ib_tx_ring_full;
178 uint64_t s_ib_tx_throttle;
179 uint64_t s_ib_tx_sg_mapping_failure;
180 uint64_t s_ib_tx_stalled;
181 uint64_t s_ib_tx_credit_updates;
182 uint64_t s_ib_rx_cq_call;
183 uint64_t s_ib_rx_cq_event;
184 uint64_t s_ib_rx_ring_empty;
185 uint64_t s_ib_rx_refill_from_cq;
186 uint64_t s_ib_rx_refill_from_thread;
187 uint64_t s_ib_rx_alloc_limit;
188 uint64_t s_ib_rx_credit_updates;
189 uint64_t s_ib_ack_sent;
190 uint64_t s_ib_ack_send_failure;
191 uint64_t s_ib_ack_send_delayed;
192 uint64_t s_ib_ack_send_piggybacked;
193 uint64_t s_ib_ack_received;
194 uint64_t s_ib_rdma_mr_alloc;
195 uint64_t s_ib_rdma_mr_free;
196 uint64_t s_ib_rdma_mr_used;
197 uint64_t s_ib_rdma_mr_pool_flush;
198 uint64_t s_ib_rdma_mr_pool_wait;
199 uint64_t s_ib_rdma_mr_pool_depleted;
200};
201
202extern struct workqueue_struct *rds_ib_wq;
203
204/*
205 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
206 * doesn't define it.
207 */
208static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
209 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
210{
211 unsigned int i;
212
213 for (i = 0; i < sg_dma_len; ++i) {
214 ib_dma_sync_single_for_cpu(dev,
215 ib_sg_dma_address(dev, &sg[i]),
216 ib_sg_dma_len(dev, &sg[i]),
217 direction);
218 }
219}
220#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
221
222static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
223 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
224{
225 unsigned int i;
226
227 for (i = 0; i < sg_dma_len; ++i) {
228 ib_dma_sync_single_for_device(dev,
229 ib_sg_dma_address(dev, &sg[i]),
230 ib_sg_dma_len(dev, &sg[i]),
231 direction);
232 }
233}
234#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
235
236
237/* ib.c */
238extern struct rds_transport rds_ib_transport;
239extern void rds_ib_add_one(struct ib_device *device);
240extern void rds_ib_remove_one(struct ib_device *device);
241extern struct ib_client rds_ib_client;
242
243extern unsigned int fmr_pool_size;
244extern unsigned int fmr_message_size;
245
246extern spinlock_t ib_nodev_conns_lock;
247extern struct list_head ib_nodev_conns;
248
249/* ib_cm.c */
250int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
251void rds_ib_conn_free(void *arg);
252int rds_ib_conn_connect(struct rds_connection *conn);
253void rds_ib_conn_shutdown(struct rds_connection *conn);
254void rds_ib_state_change(struct sock *sk);
255int __init rds_ib_listen_init(void);
256void rds_ib_listen_stop(void);
257void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
258int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
259 struct rdma_cm_event *event);
260int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
261void rds_ib_cm_connect_complete(struct rds_connection *conn,
262 struct rdma_cm_event *event);
263
264
265#define rds_ib_conn_error(conn, fmt...) \
266 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
267
268/* ib_rdma.c */
269int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
270int rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
271void rds_ib_remove_nodev_conns(void);
272void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev);
273struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
274void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
275void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
276void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
277 struct rds_sock *rs, u32 *key_ret);
278void rds_ib_sync_mr(void *trans_private, int dir);
279void rds_ib_free_mr(void *trans_private, int invalidate);
280void rds_ib_flush_mrs(void);
281
282/* ib_recv.c */
283int __init rds_ib_recv_init(void);
284void rds_ib_recv_exit(void);
285int rds_ib_recv(struct rds_connection *conn);
286int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
287 gfp_t page_gfp, int prefill);
288void rds_ib_inc_purge(struct rds_incoming *inc);
289void rds_ib_inc_free(struct rds_incoming *inc);
290int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
291 size_t size);
292void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
293void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
294void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
295void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
296void rds_ib_attempt_ack(struct rds_ib_connection *ic);
297void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
298u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
299
300/* ib_ring.c */
301void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
302void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
303u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
304void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
305void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
306int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
307int rds_ib_ring_low(struct rds_ib_work_ring *ring);
308u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
309u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
310extern wait_queue_head_t rds_ib_ring_empty_wait;
311
312/* ib_send.c */
313void rds_ib_xmit_complete(struct rds_connection *conn);
314int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
315 unsigned int hdr_off, unsigned int sg, unsigned int off);
316void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
317void rds_ib_send_init_ring(struct rds_ib_connection *ic);
318void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
319int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
320void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
321void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
322int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
323 u32 *adv_credits, int need_posted);
324
325/* ib_stats.c */
326DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
327#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
328unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
329 unsigned int avail);
330
331/* ib_sysctl.c */
332int __init rds_ib_sysctl_init(void);
333void rds_ib_sysctl_exit(void);
334extern unsigned long rds_ib_sysctl_max_send_wr;
335extern unsigned long rds_ib_sysctl_max_recv_wr;
336extern unsigned long rds_ib_sysctl_max_unsig_wrs;
337extern unsigned long rds_ib_sysctl_max_unsig_bytes;
338extern unsigned long rds_ib_sysctl_max_recv_allocation;
339extern unsigned int rds_ib_sysctl_flow_control;
340extern ctl_table rds_ib_sysctl_table[];
341
342/*
343 * Helper functions for getting/setting the header and data SGEs in
344 * RDS packets (not RDMA)
345 */
346static inline struct ib_sge *
347rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
348{
349 return &sge[0];
350}
351
352static inline struct ib_sge *
353rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
354{
355 return &sge[1];
356}
357
358static inline void rds_ib_set_64bit(u64 *ptr, u64 val)
359{
360#if BITS_PER_LONG == 64
361 *ptr = val;
362#else
363 set_64bit(ptr, val);
364#endif
365}
366
367#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 12:16:56 -0500