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Andy Groverec162272009-02-24 15:30:30 +00001#ifndef _RDS_IB_H
2#define _RDS_IB_H
3
4#include <rdma/ib_verbs.h>
5#include <rdma/rdma_cm.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +00006#include <linux/interrupt.h>
Andy Grovere4c52c92010-04-23 10:49:53 -07007#include <linux/pci.h>
8#include <linux/slab.h>
Andy Groverec162272009-02-24 15:30:30 +00009#include "rds.h"
10#include "rdma_transport.h"
11
12#define RDS_FMR_SIZE 256
Chris Masoneabb7322010-06-11 11:18:57 -070013#define RDS_FMR_POOL_SIZE 8192
Andy Groverec162272009-02-24 15:30:30 +000014
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
Andy Grover3ba23ad2009-07-17 13:13:22 +000021#define RDS_IB_DEFAULT_RETRY_COUNT 2
22
Andy Groverec162272009-02-24 15:30:30 +000023#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
24
Chris Mason33244122010-05-26 22:05:37 -070025#define RDS_IB_RECYCLE_BATCH_COUNT 32
26
Zach Brownea819862010-07-15 12:34:33 -070027extern struct rw_semaphore rds_ib_devices_lock;
Andy Groverec162272009-02-24 15:30:30 +000028extern 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 */
Andy Groverec162272009-02-24 15:30:30 +000035struct rds_page_frag {
36 struct list_head f_item;
Chris Mason33244122010-05-26 22:05:37 -070037 struct list_head f_cache_entry;
Andy Grover0b088e02010-05-24 20:12:41 -070038 struct scatterlist f_sg;
Andy Groverec162272009-02-24 15:30:30 +000039};
40
41struct rds_ib_incoming {
42 struct list_head ii_frags;
Chris Mason33244122010-05-26 22:05:37 -070043 struct list_head ii_cache_entry;
Andy Groverec162272009-02-24 15:30:30 +000044 struct rds_incoming ii_inc;
45};
46
Chris Mason33244122010-05-26 22:05:37 -070047struct rds_ib_cache_head {
48 struct list_head *first;
49 unsigned long count;
50};
51
52struct rds_ib_refill_cache {
Shan Weiae4b46e2012-11-12 15:52:01 +000053 struct rds_ib_cache_head __percpu *percpu;
Chris Mason33244122010-05-26 22:05:37 -070054 struct list_head *xfer;
55 struct list_head *ready;
56};
57
Andy Groverec162272009-02-24 15:30:30 +000058struct 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 {
Andy Groverff3d7d32010-03-01 14:03:09 -080071 void *s_op;
Andy Groverec162272009-02-24 15:30:30 +000072 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;
Andy Groverff3d7d32010-03-01 14:03:09 -0800109 struct rm_data_op *i_data_op;
Andy Groverec162272009-02-24 15:30:30 +0000110 struct rds_header *i_send_hdrs;
111 u64 i_send_hdrs_dma;
112 struct rds_ib_send_work *i_sends;
Zach Brownf0460112010-07-14 13:55:35 -0700113 atomic_t i_signaled_sends;
Andy Groverec162272009-02-24 15:30:30 +0000114
115 /* rx */
Andy Groverd521b632009-10-30 08:51:57 +0000116 struct tasklet_struct i_recv_tasklet;
Andy Groverec162272009-02-24 15:30:30 +0000117 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;
Andy Groverec162272009-02-24 15:30:30 +0000124 u64 i_ack_recv; /* last ACK received */
Chris Mason33244122010-05-26 22:05:37 -0700125 struct rds_ib_refill_cache i_cache_incs;
126 struct rds_ib_refill_cache i_cache_frags;
Andy Groverec162272009-02-24 15:30:30 +0000127
128 /* sending acks */
129 unsigned long i_ack_flags;
Andy Grover8cbd9602009-04-01 08:20:20 +0000130#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 */
Andy Groverec162272009-02-24 15:30:30 +0000134 u64 i_ack_next; /* next ACK to send */
Andy Grover8cbd9602009-04-01 08:20:20 +0000135#endif
Andy Groverec162272009-02-24 15:30:30 +0000136 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;
Andy Groverec162272009-02-24 15:30:30 +0000157};
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;
Andy Groverec162272009-02-24 15:30:30 +0000178 unsigned int fmr_max_remaps;
179 unsigned int max_fmrs;
180 int max_sge;
181 unsigned int max_wrs;
Andy Grover40589e72010-01-12 10:50:48 -0800182 unsigned int max_initiator_depth;
183 unsigned int max_responder_resources;
Andy Groverec162272009-02-24 15:30:30 +0000184 spinlock_t spinlock; /* protect the above */
Zach Brown3e0249f2010-05-18 15:48:51 -0700185 atomic_t refcount;
186 struct work_struct free_work;
Andy Groverec162272009-02-24 15:30:30 +0000187};
188
Thadeu Lima de Souza Cascardoa0c6ffb2012-05-28 08:52:05 +0000189#define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
Andy Grovere4c52c92010-04-23 10:49:53 -0700190#define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
191
Andy Groverec162272009-02-24 15:30:30 +0000192/* 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;
Andy Grover51e2cba2010-03-29 17:47:30 -0700227 uint64_t s_ib_atomic_cswp;
228 uint64_t s_ib_atomic_fadd;
Andy Groverec162272009-02-24 15:30:30 +0000229};
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,
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200238 struct scatterlist *sglist,
239 unsigned int sg_dma_len,
240 int direction)
Andy Groverec162272009-02-24 15:30:30 +0000241{
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200242 struct scatterlist *sg;
Andy Groverec162272009-02-24 15:30:30 +0000243 unsigned int i;
244
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200245 for_each_sg(sglist, sg, sg_dma_len, i) {
Andy Groverec162272009-02-24 15:30:30 +0000246 ib_dma_sync_single_for_cpu(dev,
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200247 ib_sg_dma_address(dev, sg),
248 ib_sg_dma_len(dev, sg),
Andy Groverec162272009-02-24 15:30:30 +0000249 direction);
250 }
251}
252#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
253
254static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200255 struct scatterlist *sglist,
256 unsigned int sg_dma_len,
257 int direction)
Andy Groverec162272009-02-24 15:30:30 +0000258{
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200259 struct scatterlist *sg;
Andy Groverec162272009-02-24 15:30:30 +0000260 unsigned int i;
261
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200262 for_each_sg(sglist, sg, sg_dma_len, i) {
Andy Groverec162272009-02-24 15:30:30 +0000263 ib_dma_sync_single_for_device(dev,
Fabian Frederickd2a9ec62015-06-16 20:44:07 +0200264 ib_sg_dma_address(dev, sg),
265 ib_sg_dma_len(dev, sg),
Andy Groverec162272009-02-24 15:30:30 +0000266 direction);
267 }
268}
269#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
270
271
272/* ib.c */
273extern struct rds_transport rds_ib_transport;
Zach Brown3e0249f2010-05-18 15:48:51 -0700274struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
275void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
Andy Groverec162272009-02-24 15:30:30 +0000276extern struct ib_client rds_ib_client;
277
Andy Groverec162272009-02-24 15:30:30 +0000278extern unsigned int fmr_message_size;
Andy Grover3ba23ad2009-07-17 13:13:22 +0000279extern unsigned int rds_ib_retry_count;
Andy Groverec162272009-02-24 15:30:30 +0000280
281extern spinlock_t ib_nodev_conns_lock;
282extern struct list_head ib_nodev_conns;
283
284/* ib_cm.c */
285int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
286void rds_ib_conn_free(void *arg);
287int rds_ib_conn_connect(struct rds_connection *conn);
288void rds_ib_conn_shutdown(struct rds_connection *conn);
289void rds_ib_state_change(struct sock *sk);
Zach Brownef87b7e2010-07-09 12:26:20 -0700290int rds_ib_listen_init(void);
Andy Groverec162272009-02-24 15:30:30 +0000291void rds_ib_listen_stop(void);
292void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
293int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
294 struct rdma_cm_event *event);
295int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
296void rds_ib_cm_connect_complete(struct rds_connection *conn,
297 struct rdma_cm_event *event);
298
299
300#define rds_ib_conn_error(conn, fmt...) \
301 __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
302
303/* ib_rdma.c */
304int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
Andy Grover745cbcc2009-04-01 08:20:19 +0000305void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
306void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
Zach Brown8aeb1ba2010-06-25 14:58:16 -0700307void rds_ib_destroy_nodev_conns(void);
Andy Groverec162272009-02-24 15:30:30 +0000308struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
309void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
310void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
311void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
312 struct rds_sock *rs, u32 *key_ret);
313void rds_ib_sync_mr(void *trans_private, int dir);
314void rds_ib_free_mr(void *trans_private, int invalidate);
315void rds_ib_flush_mrs(void);
316
317/* ib_recv.c */
Zach Brownef87b7e2010-07-09 12:26:20 -0700318int rds_ib_recv_init(void);
Andy Groverec162272009-02-24 15:30:30 +0000319void rds_ib_recv_exit(void);
320int rds_ib_recv(struct rds_connection *conn);
Chris Mason33244122010-05-26 22:05:37 -0700321int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
322void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
Andy Groverb6fb0df2010-06-23 18:06:30 -0700323void rds_ib_recv_refill(struct rds_connection *conn, int prefill);
Andy Groverec162272009-02-24 15:30:30 +0000324void rds_ib_inc_free(struct rds_incoming *inc);
Al Viroc310e722014-11-20 09:21:14 -0500325int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
Andy Groverec162272009-02-24 15:30:30 +0000326void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
Andy Groverd521b632009-10-30 08:51:57 +0000327void rds_ib_recv_tasklet_fn(unsigned long data);
Andy Groverec162272009-02-24 15:30:30 +0000328void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
329void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
330void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
331void rds_ib_attempt_ack(struct rds_ib_connection *ic);
332void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
333u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
334
335/* ib_ring.c */
336void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
337void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
338u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
339void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
340void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
341int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
342int rds_ib_ring_low(struct rds_ib_work_ring *ring);
343u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
344u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
345extern wait_queue_head_t rds_ib_ring_empty_wait;
346
347/* ib_send.c */
348void rds_ib_xmit_complete(struct rds_connection *conn);
349int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
350 unsigned int hdr_off, unsigned int sg, unsigned int off);
351void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
352void rds_ib_send_init_ring(struct rds_ib_connection *ic);
353void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
Andy Groverf8b3aaf2010-03-01 14:11:53 -0800354int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
Andy Groverec162272009-02-24 15:30:30 +0000355void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
356void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
357int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
Steve Wise7b70d032009-04-09 14:09:39 +0000358 u32 *adv_credits, int need_posted, int max_posted);
Andy Groverff3d7d32010-03-01 14:03:09 -0800359int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
Andy Groverec162272009-02-24 15:30:30 +0000360
361/* ib_stats.c */
362DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
363#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
364unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
365 unsigned int avail);
366
367/* ib_sysctl.c */
Zach Brownef87b7e2010-07-09 12:26:20 -0700368int rds_ib_sysctl_init(void);
Andy Groverec162272009-02-24 15:30:30 +0000369void rds_ib_sysctl_exit(void);
370extern unsigned long rds_ib_sysctl_max_send_wr;
371extern unsigned long rds_ib_sysctl_max_recv_wr;
372extern unsigned long rds_ib_sysctl_max_unsig_wrs;
373extern unsigned long rds_ib_sysctl_max_unsig_bytes;
374extern unsigned long rds_ib_sysctl_max_recv_allocation;
375extern unsigned int rds_ib_sysctl_flow_control;
Andy Groverec162272009-02-24 15:30:30 +0000376
Andy Groverec162272009-02-24 15:30:30 +0000377#endif