tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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 "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_DEFAULT_RETRY_COUNT 2
19
20#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
21
22extern struct list_head rds_ib_devices;
23
24/*
25 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
26 * try and minimize the amount of memory tied up both the device and
27 * socket receive queues.
28 */
29/* page offset of the final full frag that fits in the page */
30#define RDS_PAGE_LAST_OFF (((PAGE_SIZE / RDS_FRAG_SIZE) - 1) * RDS_FRAG_SIZE)
31struct rds_page_frag {
32 struct list_head f_item;
33 struct page *f_page;
34 unsigned long f_offset;
35 dma_addr_t f_mapped;
36};
37
38struct rds_ib_incoming {
39 struct list_head ii_frags;
40 struct rds_incoming ii_inc;
41};
42
43struct rds_ib_connect_private {
44 /* Add new fields at the end, and don't permute existing fields. */
45 __be32 dp_saddr;
46 __be32 dp_daddr;
47 u8 dp_protocol_major;
48 u8 dp_protocol_minor;
49 __be16 dp_protocol_minor_mask; /* bitmask */
50 __be32 dp_reserved1;
51 __be64 dp_ack_seq;
52 __be32 dp_credit; /* non-zero enables flow ctl */
53};
54
55struct rds_ib_send_work {
56 struct rds_message *s_rm;
57 struct rds_rdma_op *s_op;
58 struct ib_send_wr s_wr;
59 struct ib_sge s_sge[RDS_IB_MAX_SGE];
60 unsigned long s_queued;
61};
62
63struct rds_ib_recv_work {
64 struct rds_ib_incoming *r_ibinc;
65 struct rds_page_frag *r_frag;
66 struct ib_recv_wr r_wr;
67 struct ib_sge r_sge[2];
68};
69
70struct rds_ib_work_ring {
71 u32 w_nr;
72 u32 w_alloc_ptr;
73 u32 w_alloc_ctr;
74 u32 w_free_ptr;
75 atomic_t w_free_ctr;
76};
77
78struct rds_ib_device;
79
80struct rds_ib_connection {
81
82 struct list_head ib_node;
83 struct rds_ib_device *rds_ibdev;
84 struct rds_connection *conn;
85
86 /* alphabet soup, IBTA style */
87 struct rdma_cm_id *i_cm_id;
88 struct ib_pd *i_pd;
89 struct ib_mr *i_mr;
90 struct ib_cq *i_send_cq;
91 struct ib_cq *i_recv_cq;
92
93 /* tx */
94 struct rds_ib_work_ring i_send_ring;
95 struct rds_message *i_rm;
96 struct rds_header *i_send_hdrs;
97 u64 i_send_hdrs_dma;
98 struct rds_ib_send_work *i_sends;
99
100 /* rx */
101 struct mutex i_recv_mutex;
102 struct rds_ib_work_ring i_recv_ring;
103 struct rds_ib_incoming *i_ibinc;
104 u32 i_recv_data_rem;
105 struct rds_header *i_recv_hdrs;
106 u64 i_recv_hdrs_dma;
107 struct rds_ib_recv_work *i_recvs;
108 struct rds_page_frag i_frag;
109 u64 i_ack_recv; /* last ACK received */
110
111 /* sending acks */
112 unsigned long i_ack_flags;
113#ifdef KERNEL_HAS_ATOMIC64
114 atomic64_t i_ack_next; /* next ACK to send */
115#else
116 spinlock_t i_ack_lock; /* protect i_ack_next */
117 u64 i_ack_next; /* next ACK to send */
118#endif
119 struct rds_header *i_ack;
120 struct ib_send_wr i_ack_wr;
121 struct ib_sge i_ack_sge;
122 u64 i_ack_dma;
123 unsigned long i_ack_queued;
124
125 /* Flow control related information
126 *
127 * Our algorithm uses a pair variables that we need to access
128 * atomically - one for the send credits, and one posted
129 * recv credits we need to transfer to remote.
130 * Rather than protect them using a slow spinlock, we put both into
131 * a single atomic_t and update it using cmpxchg
132 */
133 atomic_t i_credits;
134
135 /* Protocol version specific information */
136 unsigned int i_flowctl:1; /* enable/disable flow ctl */
137
138 /* Batched completions */
139 unsigned int i_unsignaled_wrs;
140 long i_unsignaled_bytes;
141};
142
143/* This assumes that atomic_t is at least 32 bits */
144#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
145#define IB_GET_POST_CREDITS(v) ((v) >> 16)
146#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
147#define IB_SET_POST_CREDITS(v) ((v) << 16)
148
149struct rds_ib_ipaddr {
150 struct list_head list;
151 __be32 ipaddr;
152};
153
154struct rds_ib_device {
155 struct list_head list;
156 struct list_head ipaddr_list;
157 struct list_head conn_list;
158 struct ib_device *dev;
159 struct ib_pd *pd;
160 struct ib_mr *mr;
161 struct rds_ib_mr_pool *mr_pool;
162 unsigned int fmr_max_remaps;
163 unsigned int max_fmrs;
164 int max_sge;
165 unsigned int max_wrs;
166 spinlock_t spinlock; /* protect the above */
167};
168
169/* bits for i_ack_flags */
170#define IB_ACK_IN_FLIGHT 0
171#define IB_ACK_REQUESTED 1
172
173/* Magic WR_ID for ACKs */
174#define RDS_IB_ACK_WR_ID (~(u64) 0)
175
176struct rds_ib_statistics {
177 uint64_t s_ib_connect_raced;
178 uint64_t s_ib_listen_closed_stale;
179 uint64_t s_ib_tx_cq_call;
180 uint64_t s_ib_tx_cq_event;
181 uint64_t s_ib_tx_ring_full;
182 uint64_t s_ib_tx_throttle;
183 uint64_t s_ib_tx_sg_mapping_failure;
184 uint64_t s_ib_tx_stalled;
185 uint64_t s_ib_tx_credit_updates;
186 uint64_t s_ib_rx_cq_call;
187 uint64_t s_ib_rx_cq_event;
188 uint64_t s_ib_rx_ring_empty;
189 uint64_t s_ib_rx_refill_from_cq;
190 uint64_t s_ib_rx_refill_from_thread;
191 uint64_t s_ib_rx_alloc_limit;
192 uint64_t s_ib_rx_credit_updates;
193 uint64_t s_ib_ack_sent;
194 uint64_t s_ib_ack_send_failure;
195 uint64_t s_ib_ack_send_delayed;
196 uint64_t s_ib_ack_send_piggybacked;
197 uint64_t s_ib_ack_received;
198 uint64_t s_ib_rdma_mr_alloc;
199 uint64_t s_ib_rdma_mr_free;
200 uint64_t s_ib_rdma_mr_used;
201 uint64_t s_ib_rdma_mr_pool_flush;
202 uint64_t s_ib_rdma_mr_pool_wait;
203 uint64_t s_ib_rdma_mr_pool_depleted;
204};
205
206extern struct workqueue_struct *rds_ib_wq;
207
208/*
209 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
210 * doesn't define it.
211 */
212static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
213 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
214{
215 unsigned int i;
216
217 for (i = 0; i < sg_dma_len; ++i) {
218 ib_dma_sync_single_for_cpu(dev,
219 ib_sg_dma_address(dev, &sg[i]),
220 ib_sg_dma_len(dev, &sg[i]),
221 direction);
222 }
223}
224#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
225
226static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
227 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
228{
229 unsigned int i;
230
231 for (i = 0; i < sg_dma_len; ++i) {
232 ib_dma_sync_single_for_device(dev,
233 ib_sg_dma_address(dev, &sg[i]),
234 ib_sg_dma_len(dev, &sg[i]),
235 direction);
236 }
237}
238#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
239
240
241/* ib.c */
242extern struct rds_transport rds_ib_transport;
243extern void rds_ib_add_one(struct ib_device *device);
244extern void rds_ib_remove_one(struct ib_device *device);
245extern struct ib_client rds_ib_client;
246
247extern unsigned int fmr_pool_size;
248extern unsigned int fmr_message_size;
249extern unsigned int rds_ib_retry_count;
250
251extern spinlock_t ib_nodev_conns_lock;
252extern struct list_head ib_nodev_conns;
253
254/* ib_cm.c */
255int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
256void rds_ib_conn_free(void *arg);
257int rds_ib_conn_connect(struct rds_connection *conn);
258void rds_ib_conn_shutdown(struct rds_connection *conn);
259void rds_ib_state_change(struct sock *sk);
260int __init rds_ib_listen_init(void);
261void rds_ib_listen_stop(void);
262void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
263int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
264 struct rdma_cm_event *event);
265int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
266void rds_ib_cm_connect_complete(struct rds_connection *conn,
267 struct rdma_cm_event *event);
268
269
270#define rds_ib_conn_error(conn, fmt...) \
271 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
272
273/* ib_rdma.c */
274int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
275void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
276void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
277void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
278static inline void rds_ib_destroy_nodev_conns(void)
279{
280 __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
281}
282static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
283{
284 __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
285}
286struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
287void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
288void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
289void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
290 struct rds_sock *rs, u32 *key_ret);
291void rds_ib_sync_mr(void *trans_private, int dir);
292void rds_ib_free_mr(void *trans_private, int invalidate);
293void rds_ib_flush_mrs(void);
294
295/* ib_recv.c */
296int __init rds_ib_recv_init(void);
297void rds_ib_recv_exit(void);
298int rds_ib_recv(struct rds_connection *conn);
299int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
300 gfp_t page_gfp, int prefill);
301void rds_ib_inc_purge(struct rds_incoming *inc);
302void rds_ib_inc_free(struct rds_incoming *inc);
303int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
304 size_t size);
305void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
306void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
307void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
308void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
309void rds_ib_attempt_ack(struct rds_ib_connection *ic);
310void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
311u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
312
313/* ib_ring.c */
314void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
315void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
316u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
317void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
318void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
319int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
320int rds_ib_ring_low(struct rds_ib_work_ring *ring);
321u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
322u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
323extern wait_queue_head_t rds_ib_ring_empty_wait;
324
325/* ib_send.c */
326void rds_ib_xmit_complete(struct rds_connection *conn);
327int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
328 unsigned int hdr_off, unsigned int sg, unsigned int off);
329void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
330void rds_ib_send_init_ring(struct rds_ib_connection *ic);
331void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
332int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
333void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
334void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
335int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
336 u32 *adv_credits, int need_posted, int max_posted);
337
338/* ib_stats.c */
339DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
340#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
341unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
342 unsigned int avail);
343
344/* ib_sysctl.c */
345int __init rds_ib_sysctl_init(void);
346void rds_ib_sysctl_exit(void);
347extern unsigned long rds_ib_sysctl_max_send_wr;
348extern unsigned long rds_ib_sysctl_max_recv_wr;
349extern unsigned long rds_ib_sysctl_max_unsig_wrs;
350extern unsigned long rds_ib_sysctl_max_unsig_bytes;
351extern unsigned long rds_ib_sysctl_max_recv_allocation;
352extern unsigned int rds_ib_sysctl_flow_control;
353extern ctl_table rds_ib_sysctl_table[];
354
355/*
356 * Helper functions for getting/setting the header and data SGEs in
357 * RDS packets (not RDMA)
358 *
359 * From version 3.1 onwards, header is in front of data in the sge.
360 */
361static inline struct ib_sge *
362rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
363{
364 if (ic->conn->c_version > RDS_PROTOCOL_3_0)
365 return &sge[0];
366 else
367 return &sge[1];
368}
369
370static inline struct ib_sge *
371rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
372{
373 if (ic->conn->c_version > RDS_PROTOCOL_3_0)
374 return &sge[1];
375 else
376 return &sge[0];
377}
378
379#endif