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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 <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_FMR_SIZE 256
13#define RDS_FMR_POOL_SIZE 8192
14
15#define RDS_IB_MAX_SGE 8
16#define RDS_IB_RECV_SGE 2
17
18#define RDS_IB_DEFAULT_RECV_WR 1024
19#define RDS_IB_DEFAULT_SEND_WR 256
20
21#define RDS_IB_DEFAULT_RETRY_COUNT 2
22
23#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
24
25#define RDS_IB_RECYCLE_BATCH_COUNT 32
26
27extern struct rw_semaphore rds_ib_devices_lock;
28extern struct list_head rds_ib_devices;
29
30/*
31 * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
32 * try and minimize the amount of memory tied up both the device and
33 * socket receive queues.
34 */
35struct rds_page_frag {
36 struct list_head f_item;
37 struct list_head f_cache_entry;
38 struct scatterlist f_sg;
39};
40
41struct rds_ib_incoming {
42 struct list_head ii_frags;
43 struct list_head ii_cache_entry;
44 struct rds_incoming ii_inc;
45};
46
47struct rds_ib_cache_head {
48 struct list_head *first;
49 unsigned long count;
50};
51
52struct rds_ib_refill_cache {
53 struct rds_ib_cache_head *percpu;
54 struct list_head *xfer;
55 struct list_head *ready;
56};
57
58struct rds_ib_connect_private {
59 /* Add new fields at the end, and don't permute existing fields. */
60 __be32 dp_saddr;
61 __be32 dp_daddr;
62 u8 dp_protocol_major;
63 u8 dp_protocol_minor;
64 __be16 dp_protocol_minor_mask; /* bitmask */
65 __be32 dp_reserved1;
66 __be64 dp_ack_seq;
67 __be32 dp_credit; /* non-zero enables flow ctl */
68};
69
70struct rds_ib_send_work {
71 void *s_op;
72 struct ib_send_wr s_wr;
73 struct ib_sge s_sge[RDS_IB_MAX_SGE];
74 unsigned long s_queued;
75};
76
77struct rds_ib_recv_work {
78 struct rds_ib_incoming *r_ibinc;
79 struct rds_page_frag *r_frag;
80 struct ib_recv_wr r_wr;
81 struct ib_sge r_sge[2];
82};
83
84struct rds_ib_work_ring {
85 u32 w_nr;
86 u32 w_alloc_ptr;
87 u32 w_alloc_ctr;
88 u32 w_free_ptr;
89 atomic_t w_free_ctr;
90};
91
92struct rds_ib_device;
93
94struct rds_ib_connection {
95
96 struct list_head ib_node;
97 struct rds_ib_device *rds_ibdev;
98 struct rds_connection *conn;
99
100 /* alphabet soup, IBTA style */
101 struct rdma_cm_id *i_cm_id;
102 struct ib_pd *i_pd;
103 struct ib_mr *i_mr;
104 struct ib_cq *i_send_cq;
105 struct ib_cq *i_recv_cq;
106
107 /* tx */
108 struct rds_ib_work_ring i_send_ring;
109 struct rm_data_op *i_data_op;
110 struct rds_header *i_send_hdrs;
111 u64 i_send_hdrs_dma;
112 struct rds_ib_send_work *i_sends;
113 atomic_t i_signaled_sends;
114
115 /* rx */
116 struct tasklet_struct i_recv_tasklet;
117 struct mutex i_recv_mutex;
118 struct rds_ib_work_ring i_recv_ring;
119 struct rds_ib_incoming *i_ibinc;
120 u32 i_recv_data_rem;
121 struct rds_header *i_recv_hdrs;
122 u64 i_recv_hdrs_dma;
123 struct rds_ib_recv_work *i_recvs;
124 u64 i_ack_recv; /* last ACK received */
125 struct rds_ib_refill_cache i_cache_incs;
126 struct rds_ib_refill_cache i_cache_frags;
127
128 /* sending acks */
129 unsigned long i_ack_flags;
130#ifdef KERNEL_HAS_ATOMIC64
131 atomic64_t i_ack_next; /* next ACK to send */
132#else
133 spinlock_t i_ack_lock; /* protect i_ack_next */
134 u64 i_ack_next; /* next ACK to send */
135#endif
136 struct rds_header *i_ack;
137 struct ib_send_wr i_ack_wr;
138 struct ib_sge i_ack_sge;
139 u64 i_ack_dma;
140 unsigned long i_ack_queued;
141
142 /* Flow control related information
143 *
144 * Our algorithm uses a pair variables that we need to access
145 * atomically - one for the send credits, and one posted
146 * recv credits we need to transfer to remote.
147 * Rather than protect them using a slow spinlock, we put both into
148 * a single atomic_t and update it using cmpxchg
149 */
150 atomic_t i_credits;
151
152 /* Protocol version specific information */
153 unsigned int i_flowctl:1; /* enable/disable flow ctl */
154
155 /* Batched completions */
156 unsigned int i_unsignaled_wrs;
157};
158
159/* This assumes that atomic_t is at least 32 bits */
160#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
161#define IB_GET_POST_CREDITS(v) ((v) >> 16)
162#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
163#define IB_SET_POST_CREDITS(v) ((v) << 16)
164
165struct rds_ib_ipaddr {
166 struct list_head list;
167 __be32 ipaddr;
168};
169
170struct rds_ib_device {
171 struct list_head list;
172 struct list_head ipaddr_list;
173 struct list_head conn_list;
174 struct ib_device *dev;
175 struct ib_pd *pd;
176 struct ib_mr *mr;
177 struct rds_ib_mr_pool *mr_pool;
178 unsigned int fmr_max_remaps;
179 unsigned int max_fmrs;
180 int max_sge;
181 unsigned int max_wrs;
182 unsigned int max_initiator_depth;
183 unsigned int max_responder_resources;
184 spinlock_t spinlock; /* protect the above */
185 atomic_t refcount;
186 struct work_struct free_work;
187};
188
189#define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
190#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
191
192/* bits for i_ack_flags */
193#define IB_ACK_IN_FLIGHT 0
194#define IB_ACK_REQUESTED 1
195
196/* Magic WR_ID for ACKs */
197#define RDS_IB_ACK_WR_ID (~(u64) 0)
198
199struct rds_ib_statistics {
200 uint64_t s_ib_connect_raced;
201 uint64_t s_ib_listen_closed_stale;
202 uint64_t s_ib_tx_cq_call;
203 uint64_t s_ib_tx_cq_event;
204 uint64_t s_ib_tx_ring_full;
205 uint64_t s_ib_tx_throttle;
206 uint64_t s_ib_tx_sg_mapping_failure;
207 uint64_t s_ib_tx_stalled;
208 uint64_t s_ib_tx_credit_updates;
209 uint64_t s_ib_rx_cq_call;
210 uint64_t s_ib_rx_cq_event;
211 uint64_t s_ib_rx_ring_empty;
212 uint64_t s_ib_rx_refill_from_cq;
213 uint64_t s_ib_rx_refill_from_thread;
214 uint64_t s_ib_rx_alloc_limit;
215 uint64_t s_ib_rx_credit_updates;
216 uint64_t s_ib_ack_sent;
217 uint64_t s_ib_ack_send_failure;
218 uint64_t s_ib_ack_send_delayed;
219 uint64_t s_ib_ack_send_piggybacked;
220 uint64_t s_ib_ack_received;
221 uint64_t s_ib_rdma_mr_alloc;
222 uint64_t s_ib_rdma_mr_free;
223 uint64_t s_ib_rdma_mr_used;
224 uint64_t s_ib_rdma_mr_pool_flush;
225 uint64_t s_ib_rdma_mr_pool_wait;
226 uint64_t s_ib_rdma_mr_pool_depleted;
227 uint64_t s_ib_atomic_cswp;
228 uint64_t s_ib_atomic_fadd;
229};
230
231extern struct workqueue_struct *rds_ib_wq;
232
233/*
234 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
235 * doesn't define it.
236 */
237static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
238 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
239{
240 unsigned int i;
241
242 for (i = 0; i < sg_dma_len; ++i) {
243 ib_dma_sync_single_for_cpu(dev,
244 ib_sg_dma_address(dev, &sg[i]),
245 ib_sg_dma_len(dev, &sg[i]),
246 direction);
247 }
248}
249#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
250
251static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
252 struct scatterlist *sg, unsigned int sg_dma_len, int direction)
253{
254 unsigned int i;
255
256 for (i = 0; i < sg_dma_len; ++i) {
257 ib_dma_sync_single_for_device(dev,
258 ib_sg_dma_address(dev, &sg[i]),
259 ib_sg_dma_len(dev, &sg[i]),
260 direction);
261 }
262}
263#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
264
265
266/* ib.c */
267extern struct rds_transport rds_ib_transport;
268struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
269void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
270extern struct ib_client rds_ib_client;
271
272extern unsigned int fmr_message_size;
273extern unsigned int rds_ib_retry_count;
274
275extern spinlock_t ib_nodev_conns_lock;
276extern struct list_head ib_nodev_conns;
277
278/* ib_cm.c */
279int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
280void rds_ib_conn_free(void *arg);
281int rds_ib_conn_connect(struct rds_connection *conn);
282void rds_ib_conn_shutdown(struct rds_connection *conn);
283void rds_ib_state_change(struct sock *sk);
284int rds_ib_listen_init(void);
285void rds_ib_listen_stop(void);
286void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
287int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
288 struct rdma_cm_event *event);
289int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
290void rds_ib_cm_connect_complete(struct rds_connection *conn,
291 struct rdma_cm_event *event);
292
293
294#define rds_ib_conn_error(conn, fmt...) \
295 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
296
297/* ib_rdma.c */
298int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
299void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
300void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
301void rds_ib_destroy_nodev_conns(void);
302struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
303void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
304void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
305void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
306 struct rds_sock *rs, u32 *key_ret);
307void rds_ib_sync_mr(void *trans_private, int dir);
308void rds_ib_free_mr(void *trans_private, int invalidate);
309void rds_ib_flush_mrs(void);
310
311/* ib_recv.c */
312int rds_ib_recv_init(void);
313void rds_ib_recv_exit(void);
314int rds_ib_recv(struct rds_connection *conn);
315int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
316void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
317void rds_ib_recv_refill(struct rds_connection *conn, int prefill);
318void rds_ib_inc_free(struct rds_incoming *inc);
319int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
320 size_t size);
321void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
322void rds_ib_recv_tasklet_fn(unsigned long data);
323void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
324void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
325void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
326void rds_ib_attempt_ack(struct rds_ib_connection *ic);
327void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
328u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
329
330/* ib_ring.c */
331void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
332void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
333u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
334void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
335void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
336int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
337int rds_ib_ring_low(struct rds_ib_work_ring *ring);
338u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
339u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
340extern wait_queue_head_t rds_ib_ring_empty_wait;
341
342/* ib_send.c */
343char *rds_ib_wc_status_str(enum ib_wc_status status);
344void rds_ib_xmit_complete(struct rds_connection *conn);
345int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
346 unsigned int hdr_off, unsigned int sg, unsigned int off);
347void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
348void rds_ib_send_init_ring(struct rds_ib_connection *ic);
349void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
350int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
351void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
352void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
353int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
354 u32 *adv_credits, int need_posted, int max_posted);
355int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
356
357/* ib_stats.c */
358DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
359#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
360unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
361 unsigned int avail);
362
363/* ib_sysctl.c */
364int rds_ib_sysctl_init(void);
365void rds_ib_sysctl_exit(void);
366extern unsigned long rds_ib_sysctl_max_send_wr;
367extern unsigned long rds_ib_sysctl_max_recv_wr;
368extern unsigned long rds_ib_sysctl_max_unsig_wrs;
369extern unsigned long rds_ib_sysctl_max_unsig_bytes;
370extern unsigned long rds_ib_sysctl_max_recv_allocation;
371extern unsigned int rds_ib_sysctl_flow_control;
372
373#endif
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
29extern struct rw_semaphore rds_ib_devices_lock;
30extern 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 */
37struct rds_page_frag {
38 struct list_head f_item;
39 struct list_head f_cache_entry;
40 struct scatterlist f_sg;
41};
42
43struct rds_ib_incoming {
44 struct list_head ii_frags;
45 struct list_head ii_cache_entry;
46 struct rds_incoming ii_inc;
47};
48
49struct rds_ib_cache_head {
50 struct list_head *first;
51 unsigned long count;
52};
53
54struct rds_ib_refill_cache {
55 struct rds_ib_cache_head __percpu *percpu;
56 struct list_head *xfer;
57 struct list_head *ready;
58};
59
60struct 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
72struct 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
83struct 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
90struct 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 */
103struct 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
112struct rds_ib_device;
113
114struct 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
202struct rds_ib_ipaddr {
203 struct list_head list;
204 __be32 ipaddr;
205 struct rcu_head rcu;
206};
207
208enum {
209 RDS_IB_MR_8K_POOL,
210 RDS_IB_MR_1M_POOL,
211};
212
213struct 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
247struct 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
291extern 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 */
297static 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
314static 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 */
333extern struct rds_transport rds_ib_transport;
334struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
335void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
336extern struct ib_client rds_ib_client;
337
338extern unsigned int rds_ib_retry_count;
339
340extern spinlock_t ib_nodev_conns_lock;
341extern struct list_head ib_nodev_conns;
342
343/* ib_cm.c */
344int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
345void rds_ib_conn_free(void *arg);
346int rds_ib_conn_path_connect(struct rds_conn_path *cp);
347void rds_ib_conn_path_shutdown(struct rds_conn_path *cp);
348void rds_ib_state_change(struct sock *sk);
349int rds_ib_listen_init(void);
350void rds_ib_listen_stop(void);
351__printf(2, 3)
352void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
353int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
354 struct rdma_cm_event *event);
355int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
356void 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 */
364int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
365void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
366void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
367void rds_ib_destroy_nodev_conns(void);
368void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
369
370/* ib_recv.c */
371int rds_ib_recv_init(void);
372void rds_ib_recv_exit(void);
373int rds_ib_recv_path(struct rds_conn_path *conn);
374int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
375void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
376void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
377void rds_ib_inc_free(struct rds_incoming *inc);
378int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
379void rds_ib_recv_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc,
380 struct rds_ib_ack_state *state);
381void rds_ib_recv_tasklet_fn(unsigned long data);
382void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
383void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
384void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
385void rds_ib_attempt_ack(struct rds_ib_connection *ic);
386void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
387u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
388void rds_ib_set_ack(struct rds_ib_connection *ic, u64 seq, int ack_required);
389
390/* ib_ring.c */
391void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
392void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
393u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
394void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
395void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
396int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
397int rds_ib_ring_low(struct rds_ib_work_ring *ring);
398u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
399u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
400extern wait_queue_head_t rds_ib_ring_empty_wait;
401
402/* ib_send.c */
403void rds_ib_xmit_path_complete(struct rds_conn_path *cp);
404int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
405 unsigned int hdr_off, unsigned int sg, unsigned int off);
406void rds_ib_send_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc);
407void rds_ib_send_init_ring(struct rds_ib_connection *ic);
408void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
409int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
410void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
411void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
412int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
413 u32 *adv_credits, int need_posted, int max_posted);
414int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
415
416/* ib_stats.c */
417DECLARE_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)
421unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
422 unsigned int avail);
423
424/* ib_sysctl.c */
425int rds_ib_sysctl_init(void);
426void rds_ib_sysctl_exit(void);
427extern unsigned long rds_ib_sysctl_max_send_wr;
428extern unsigned long rds_ib_sysctl_max_recv_wr;
429extern unsigned long rds_ib_sysctl_max_unsig_wrs;
430extern unsigned long rds_ib_sysctl_max_unsig_bytes;
431extern unsigned long rds_ib_sysctl_max_recv_allocation;
432extern unsigned int rds_ib_sysctl_flow_control;
433
434#endif