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-rw-r--r--net/rds/iw.h395
1 files changed, 395 insertions, 0 deletions
diff --git a/net/rds/iw.h b/net/rds/iw.h
new file mode 100644
index 000000000000..0ddda34f2a1c
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1#ifndef _RDS_IW_H
2#define _RDS_IW_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_FASTREG_SIZE 20
10#define RDS_FASTREG_POOL_SIZE 2048
11
12#define RDS_IW_MAX_SGE 8
13#define RDS_IW_RECV_SGE 2
14
15#define RDS_IW_DEFAULT_RECV_WR 1024
16#define RDS_IW_DEFAULT_SEND_WR 256
17
18#define RDS_IW_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
19
20extern struct list_head rds_iw_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_iw_incoming {
37 struct list_head ii_frags;
38 struct rds_incoming ii_inc;
39};
40
41struct rds_iw_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_iw_scatterlist {
54 struct scatterlist *list;
55 unsigned int len;
56 int dma_len;
57 unsigned int dma_npages;
58 unsigned int bytes;
59};
60
61struct rds_iw_mapping {
62 spinlock_t m_lock; /* protect the mapping struct */
63 struct list_head m_list;
64 struct rds_iw_mr *m_mr;
65 uint32_t m_rkey;
66 struct rds_iw_scatterlist m_sg;
67};
68
69struct rds_iw_send_work {
70 struct rds_message *s_rm;
71
72 /* We should really put these into a union: */
73 struct rds_rdma_op *s_op;
74 struct rds_iw_mapping *s_mapping;
75 struct ib_mr *s_mr;
76 struct ib_fast_reg_page_list *s_page_list;
77 unsigned char s_remap_count;
78
79 struct ib_send_wr s_wr;
80 struct ib_sge s_sge[RDS_IW_MAX_SGE];
81 unsigned long s_queued;
82};
83
84struct rds_iw_recv_work {
85 struct rds_iw_incoming *r_iwinc;
86 struct rds_page_frag *r_frag;
87 struct ib_recv_wr r_wr;
88 struct ib_sge r_sge[2];
89};
90
91struct rds_iw_work_ring {
92 u32 w_nr;
93 u32 w_alloc_ptr;
94 u32 w_alloc_ctr;
95 u32 w_free_ptr;
96 atomic_t w_free_ctr;
97};
98
99struct rds_iw_device;
100
101struct rds_iw_connection {
102
103 struct list_head iw_node;
104 struct rds_iw_device *rds_iwdev;
105 struct rds_connection *conn;
106
107 /* alphabet soup, IBTA style */
108 struct rdma_cm_id *i_cm_id;
109 struct ib_pd *i_pd;
110 struct ib_mr *i_mr;
111 struct ib_cq *i_send_cq;
112 struct ib_cq *i_recv_cq;
113
114 /* tx */
115 struct rds_iw_work_ring i_send_ring;
116 struct rds_message *i_rm;
117 struct rds_header *i_send_hdrs;
118 u64 i_send_hdrs_dma;
119 struct rds_iw_send_work *i_sends;
120
121 /* rx */
122 struct mutex i_recv_mutex;
123 struct rds_iw_work_ring i_recv_ring;
124 struct rds_iw_incoming *i_iwinc;
125 u32 i_recv_data_rem;
126 struct rds_header *i_recv_hdrs;
127 u64 i_recv_hdrs_dma;
128 struct rds_iw_recv_work *i_recvs;
129 struct rds_page_frag i_frag;
130 u64 i_ack_recv; /* last ACK received */
131
132 /* sending acks */
133 unsigned long i_ack_flags;
134 u64 i_ack_next; /* next ACK to send */
135 struct rds_header *i_ack;
136 struct ib_send_wr i_ack_wr;
137 struct ib_sge i_ack_sge;
138 u64 i_ack_dma;
139 unsigned long i_ack_queued;
140
141 /* Flow control related information
142 *
143 * Our algorithm uses a pair variables that we need to access
144 * atomically - one for the send credits, and one posted
145 * recv credits we need to transfer to remote.
146 * Rather than protect them using a slow spinlock, we put both into
147 * a single atomic_t and update it using cmpxchg
148 */
149 atomic_t i_credits;
150
151 /* Protocol version specific information */
152 unsigned int i_flowctl:1; /* enable/disable flow ctl */
153 unsigned int i_dma_local_lkey:1;
154 unsigned int i_fastreg_posted:1; /* fastreg posted on this connection */
155 /* Batched completions */
156 unsigned int i_unsignaled_wrs;
157 long i_unsignaled_bytes;
158};
159
160/* This assumes that atomic_t is at least 32 bits */
161#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
162#define IB_GET_POST_CREDITS(v) ((v) >> 16)
163#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
164#define IB_SET_POST_CREDITS(v) ((v) << 16)
165
166struct rds_iw_cm_id {
167 struct list_head list;
168 struct rdma_cm_id *cm_id;
169};
170
171struct rds_iw_device {
172 struct list_head list;
173 struct list_head cm_id_list;
174 struct list_head conn_list;
175 struct ib_device *dev;
176 struct ib_pd *pd;
177 struct ib_mr *mr;
178 struct rds_iw_mr_pool *mr_pool;
179 int page_shift;
180 int max_sge;
181 unsigned int max_wrs;
182 unsigned int dma_local_lkey:1;
183 spinlock_t spinlock; /* protect the above */
184};
185
186/* bits for i_ack_flags */
187#define IB_ACK_IN_FLIGHT 0
188#define IB_ACK_REQUESTED 1
189
190/* Magic WR_ID for ACKs */
191#define RDS_IW_ACK_WR_ID ((u64)0xffffffffffffffffULL)
192#define RDS_IW_FAST_REG_WR_ID ((u64)0xefefefefefefefefULL)
193#define RDS_IW_LOCAL_INV_WR_ID ((u64)0xdfdfdfdfdfdfdfdfULL)
194
195struct rds_iw_statistics {
196 uint64_t s_iw_connect_raced;
197 uint64_t s_iw_listen_closed_stale;
198 uint64_t s_iw_tx_cq_call;
199 uint64_t s_iw_tx_cq_event;
200 uint64_t s_iw_tx_ring_full;
201 uint64_t s_iw_tx_throttle;
202 uint64_t s_iw_tx_sg_mapping_failure;
203 uint64_t s_iw_tx_stalled;
204 uint64_t s_iw_tx_credit_updates;
205 uint64_t s_iw_rx_cq_call;
206 uint64_t s_iw_rx_cq_event;
207 uint64_t s_iw_rx_ring_empty;
208 uint64_t s_iw_rx_refill_from_cq;
209 uint64_t s_iw_rx_refill_from_thread;
210 uint64_t s_iw_rx_alloc_limit;
211 uint64_t s_iw_rx_credit_updates;
212 uint64_t s_iw_ack_sent;
213 uint64_t s_iw_ack_send_failure;
214 uint64_t s_iw_ack_send_delayed;
215 uint64_t s_iw_ack_send_piggybacked;
216 uint64_t s_iw_ack_received;
217 uint64_t s_iw_rdma_mr_alloc;
218 uint64_t s_iw_rdma_mr_free;
219 uint64_t s_iw_rdma_mr_used;
220 uint64_t s_iw_rdma_mr_pool_flush;
221 uint64_t s_iw_rdma_mr_pool_wait;
222 uint64_t s_iw_rdma_mr_pool_depleted;
223};
224
225extern struct workqueue_struct *rds_iw_wq;
226
227/*
228 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
229 * doesn't define it.
230 */
231static inline void rds_iw_dma_sync_sg_for_cpu(struct ib_device *dev,
232 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
233{
234 unsigned int i;
235
236 for (i = 0; i < sg_dma_len; ++i) {
237 ib_dma_sync_single_for_cpu(dev,
238 ib_sg_dma_address(dev, &sg[i]),
239 ib_sg_dma_len(dev, &sg[i]),
240 direction);
241 }
242}
243#define ib_dma_sync_sg_for_cpu rds_iw_dma_sync_sg_for_cpu
244
245static inline void rds_iw_dma_sync_sg_for_device(struct ib_device *dev,
246 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
247{
248 unsigned int i;
249
250 for (i = 0; i < sg_dma_len; ++i) {
251 ib_dma_sync_single_for_device(dev,
252 ib_sg_dma_address(dev, &sg[i]),
253 ib_sg_dma_len(dev, &sg[i]),
254 direction);
255 }
256}
257#define ib_dma_sync_sg_for_device rds_iw_dma_sync_sg_for_device
258
259static inline u32 rds_iw_local_dma_lkey(struct rds_iw_connection *ic)
260{
261 return ic->i_dma_local_lkey ? ic->i_cm_id->device->local_dma_lkey : ic->i_mr->lkey;
262}
263
264/* ib.c */
265extern struct rds_transport rds_iw_transport;
266extern void rds_iw_add_one(struct ib_device *device);
267extern void rds_iw_remove_one(struct ib_device *device);
268extern struct ib_client rds_iw_client;
269
270extern unsigned int fastreg_pool_size;
271extern unsigned int fastreg_message_size;
272
273extern spinlock_t iw_nodev_conns_lock;
274extern struct list_head iw_nodev_conns;
275
276/* ib_cm.c */
277int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp);
278void rds_iw_conn_free(void *arg);
279int rds_iw_conn_connect(struct rds_connection *conn);
280void rds_iw_conn_shutdown(struct rds_connection *conn);
281void rds_iw_state_change(struct sock *sk);
282int __init rds_iw_listen_init(void);
283void rds_iw_listen_stop(void);
284void __rds_iw_conn_error(struct rds_connection *conn, const char *, ...);
285int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
286 struct rdma_cm_event *event);
287int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id);
288void rds_iw_cm_connect_complete(struct rds_connection *conn,
289 struct rdma_cm_event *event);
290
291
292#define rds_iw_conn_error(conn, fmt...) \
293 __rds_iw_conn_error(conn, KERN_WARNING "RDS/IW: " fmt)
294
295/* ib_rdma.c */
296int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id);
297int rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn);
298void rds_iw_remove_nodev_conns(void);
299void rds_iw_remove_conns(struct rds_iw_device *rds_iwdev);
300struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *);
301void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo);
302void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *);
303void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents,
304 struct rds_sock *rs, u32 *key_ret);
305void rds_iw_sync_mr(void *trans_private, int dir);
306void rds_iw_free_mr(void *trans_private, int invalidate);
307void rds_iw_flush_mrs(void);
308void rds_iw_remove_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id);
309
310/* ib_recv.c */
311int __init rds_iw_recv_init(void);
312void rds_iw_recv_exit(void);
313int rds_iw_recv(struct rds_connection *conn);
314int rds_iw_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
315 gfp_t page_gfp, int prefill);
316void rds_iw_inc_purge(struct rds_incoming *inc);
317void rds_iw_inc_free(struct rds_incoming *inc);
318int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
319 size_t size);
320void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context);
321void rds_iw_recv_init_ring(struct rds_iw_connection *ic);
322void rds_iw_recv_clear_ring(struct rds_iw_connection *ic);
323void rds_iw_recv_init_ack(struct rds_iw_connection *ic);
324void rds_iw_attempt_ack(struct rds_iw_connection *ic);
325void rds_iw_ack_send_complete(struct rds_iw_connection *ic);
326u64 rds_iw_piggyb_ack(struct rds_iw_connection *ic);
327
328/* ib_ring.c */
329void rds_iw_ring_init(struct rds_iw_work_ring *ring, u32 nr);
330void rds_iw_ring_resize(struct rds_iw_work_ring *ring, u32 nr);
331u32 rds_iw_ring_alloc(struct rds_iw_work_ring *ring, u32 val, u32 *pos);
332void rds_iw_ring_free(struct rds_iw_work_ring *ring, u32 val);
333void rds_iw_ring_unalloc(struct rds_iw_work_ring *ring, u32 val);
334int rds_iw_ring_empty(struct rds_iw_work_ring *ring);
335int rds_iw_ring_low(struct rds_iw_work_ring *ring);
336u32 rds_iw_ring_oldest(struct rds_iw_work_ring *ring);
337u32 rds_iw_ring_completed(struct rds_iw_work_ring *ring, u32 wr_id, u32 oldest);
338extern wait_queue_head_t rds_iw_ring_empty_wait;
339
340/* ib_send.c */
341void rds_iw_xmit_complete(struct rds_connection *conn);
342int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
343 unsigned int hdr_off, unsigned int sg, unsigned int off);
344void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context);
345void rds_iw_send_init_ring(struct rds_iw_connection *ic);
346void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
347int rds_iw_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
348void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
349void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
350int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
351 u32 *adv_credits, int need_posted);
352
353/* ib_stats.c */
354DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
355#define rds_iw_stats_inc(member) rds_stats_inc_which(rds_iw_stats, member)
356unsigned int rds_iw_stats_info_copy(struct rds_info_iterator *iter,
357 unsigned int avail);
358
359/* ib_sysctl.c */
360int __init rds_iw_sysctl_init(void);
361void rds_iw_sysctl_exit(void);
362extern unsigned long rds_iw_sysctl_max_send_wr;
363extern unsigned long rds_iw_sysctl_max_recv_wr;
364extern unsigned long rds_iw_sysctl_max_unsig_wrs;
365extern unsigned long rds_iw_sysctl_max_unsig_bytes;
366extern unsigned long rds_iw_sysctl_max_recv_allocation;
367extern unsigned int rds_iw_sysctl_flow_control;
368extern ctl_table rds_iw_sysctl_table[];
369
370/*
371 * Helper functions for getting/setting the header and data SGEs in
372 * RDS packets (not RDMA)
373 */
374static inline struct ib_sge *
375rds_iw_header_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
376{
377 return &sge[0];
378}
379
380static inline struct ib_sge *
381rds_iw_data_sge(struct rds_iw_connection *ic, struct ib_sge *sge)
382{
383 return &sge[1];
384}
385
386static inline void rds_iw_set_64bit(u64 *ptr, u64 val)
387{
388#if BITS_PER_LONG == 64
389 *ptr = val;
390#else
391 set_64bit(ptr, val);
392#endif
393}
394
395#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-01 13:06:51 -0500