Root/net/rds/ib.h

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 tasklet_struct i_recv_tasklet;
102    struct mutex i_recv_mutex;
103    struct rds_ib_work_ring i_recv_ring;
104    struct rds_ib_incoming *i_ibinc;
105    u32 i_recv_data_rem;
106    struct rds_header *i_recv_hdrs;
107    u64 i_recv_hdrs_dma;
108    struct rds_ib_recv_work *i_recvs;
109    struct rds_page_frag i_frag;
110    u64 i_ack_recv; /* last ACK received */
111
112    /* sending acks */
113    unsigned long i_ack_flags;
114#ifdef KERNEL_HAS_ATOMIC64
115    atomic64_t i_ack_next; /* next ACK to send */
116#else
117    spinlock_t i_ack_lock; /* protect i_ack_next */
118    u64 i_ack_next; /* next ACK to send */
119#endif
120    struct rds_header *i_ack;
121    struct ib_send_wr i_ack_wr;
122    struct ib_sge i_ack_sge;
123    u64 i_ack_dma;
124    unsigned long i_ack_queued;
125
126    /* Flow control related information
127     *
128     * Our algorithm uses a pair variables that we need to access
129     * atomically - one for the send credits, and one posted
130     * recv credits we need to transfer to remote.
131     * Rather than protect them using a slow spinlock, we put both into
132     * a single atomic_t and update it using cmpxchg
133     */
134    atomic_t i_credits;
135
136    /* Protocol version specific information */
137    unsigned int i_flowctl:1; /* enable/disable flow ctl */
138
139    /* Batched completions */
140    unsigned int i_unsignaled_wrs;
141    long i_unsignaled_bytes;
142};
143
144/* This assumes that atomic_t is at least 32 bits */
145#define IB_GET_SEND_CREDITS(v) ((v) & 0xffff)
146#define IB_GET_POST_CREDITS(v) ((v) >> 16)
147#define IB_SET_SEND_CREDITS(v) ((v) & 0xffff)
148#define IB_SET_POST_CREDITS(v) ((v) << 16)
149
150struct rds_ib_ipaddr {
151    struct list_head list;
152    __be32 ipaddr;
153};
154
155struct rds_ib_device {
156    struct list_head list;
157    struct list_head ipaddr_list;
158    struct list_head conn_list;
159    struct ib_device *dev;
160    struct ib_pd *pd;
161    struct ib_mr *mr;
162    struct rds_ib_mr_pool *mr_pool;
163    unsigned int fmr_max_remaps;
164    unsigned int max_fmrs;
165    int max_sge;
166    unsigned int max_wrs;
167    spinlock_t spinlock; /* protect the above */
168};
169
170/* bits for i_ack_flags */
171#define IB_ACK_IN_FLIGHT 0
172#define IB_ACK_REQUESTED 1
173
174/* Magic WR_ID for ACKs */
175#define RDS_IB_ACK_WR_ID (~(u64) 0)
176
177struct rds_ib_statistics {
178    uint64_t s_ib_connect_raced;
179    uint64_t s_ib_listen_closed_stale;
180    uint64_t s_ib_tx_cq_call;
181    uint64_t s_ib_tx_cq_event;
182    uint64_t s_ib_tx_ring_full;
183    uint64_t s_ib_tx_throttle;
184    uint64_t s_ib_tx_sg_mapping_failure;
185    uint64_t s_ib_tx_stalled;
186    uint64_t s_ib_tx_credit_updates;
187    uint64_t s_ib_rx_cq_call;
188    uint64_t s_ib_rx_cq_event;
189    uint64_t s_ib_rx_ring_empty;
190    uint64_t s_ib_rx_refill_from_cq;
191    uint64_t s_ib_rx_refill_from_thread;
192    uint64_t s_ib_rx_alloc_limit;
193    uint64_t s_ib_rx_credit_updates;
194    uint64_t s_ib_ack_sent;
195    uint64_t s_ib_ack_send_failure;
196    uint64_t s_ib_ack_send_delayed;
197    uint64_t s_ib_ack_send_piggybacked;
198    uint64_t s_ib_ack_received;
199    uint64_t s_ib_rdma_mr_alloc;
200    uint64_t s_ib_rdma_mr_free;
201    uint64_t s_ib_rdma_mr_used;
202    uint64_t s_ib_rdma_mr_pool_flush;
203    uint64_t s_ib_rdma_mr_pool_wait;
204    uint64_t s_ib_rdma_mr_pool_depleted;
205};
206
207extern struct workqueue_struct *rds_ib_wq;
208
209/*
210 * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
211 * doesn't define it.
212 */
213static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
214        struct scatterlist *sg, unsigned int sg_dma_len, int direction)
215{
216    unsigned int i;
217
218    for (i = 0; i < sg_dma_len; ++i) {
219        ib_dma_sync_single_for_cpu(dev,
220                ib_sg_dma_address(dev, &sg[i]),
221                ib_sg_dma_len(dev, &sg[i]),
222                direction);
223    }
224}
225#define ib_dma_sync_sg_for_cpu rds_ib_dma_sync_sg_for_cpu
226
227static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
228        struct scatterlist *sg, unsigned int sg_dma_len, int direction)
229{
230    unsigned int i;
231
232    for (i = 0; i < sg_dma_len; ++i) {
233        ib_dma_sync_single_for_device(dev,
234                ib_sg_dma_address(dev, &sg[i]),
235                ib_sg_dma_len(dev, &sg[i]),
236                direction);
237    }
238}
239#define ib_dma_sync_sg_for_device rds_ib_dma_sync_sg_for_device
240
241
242/* ib.c */
243extern struct rds_transport rds_ib_transport;
244extern void rds_ib_add_one(struct ib_device *device);
245extern void rds_ib_remove_one(struct ib_device *device);
246extern struct ib_client rds_ib_client;
247
248extern unsigned int fmr_pool_size;
249extern unsigned int fmr_message_size;
250extern unsigned int rds_ib_retry_count;
251
252extern spinlock_t ib_nodev_conns_lock;
253extern struct list_head ib_nodev_conns;
254
255/* ib_cm.c */
256int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
257void rds_ib_conn_free(void *arg);
258int rds_ib_conn_connect(struct rds_connection *conn);
259void rds_ib_conn_shutdown(struct rds_connection *conn);
260void rds_ib_state_change(struct sock *sk);
261int __init rds_ib_listen_init(void);
262void rds_ib_listen_stop(void);
263void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
264int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
265                 struct rdma_cm_event *event);
266int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
267void rds_ib_cm_connect_complete(struct rds_connection *conn,
268                struct rdma_cm_event *event);
269
270
271#define rds_ib_conn_error(conn, fmt...) \
272    __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
273
274/* ib_rdma.c */
275int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
276void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
277void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
278void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock);
279static inline void rds_ib_destroy_nodev_conns(void)
280{
281    __rds_ib_destroy_conns(&ib_nodev_conns, &ib_nodev_conns_lock);
282}
283static inline void rds_ib_destroy_conns(struct rds_ib_device *rds_ibdev)
284{
285    __rds_ib_destroy_conns(&rds_ibdev->conn_list, &rds_ibdev->spinlock);
286}
287struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
288void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
289void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
290void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
291            struct rds_sock *rs, u32 *key_ret);
292void rds_ib_sync_mr(void *trans_private, int dir);
293void rds_ib_free_mr(void *trans_private, int invalidate);
294void rds_ib_flush_mrs(void);
295
296/* ib_recv.c */
297int __init rds_ib_recv_init(void);
298void rds_ib_recv_exit(void);
299int rds_ib_recv(struct rds_connection *conn);
300int rds_ib_recv_refill(struct rds_connection *conn, gfp_t kptr_gfp,
301               gfp_t page_gfp, int prefill);
302void rds_ib_inc_purge(struct rds_incoming *inc);
303void rds_ib_inc_free(struct rds_incoming *inc);
304int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
305                 size_t size);
306void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
307void rds_ib_recv_tasklet_fn(unsigned long data);
308void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
309void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
310void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
311void rds_ib_attempt_ack(struct rds_ib_connection *ic);
312void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
313u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
314
315/* ib_ring.c */
316void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
317void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
318u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
319void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
320void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
321int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
322int rds_ib_ring_low(struct rds_ib_work_ring *ring);
323u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
324u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
325extern wait_queue_head_t rds_ib_ring_empty_wait;
326
327/* ib_send.c */
328void rds_ib_xmit_complete(struct rds_connection *conn);
329int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
330        unsigned int hdr_off, unsigned int sg, unsigned int off);
331void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
332void rds_ib_send_init_ring(struct rds_ib_connection *ic);
333void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
334int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
335void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
336void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
337int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
338                 u32 *adv_credits, int need_posted, int max_posted);
339
340/* ib_stats.c */
341DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
342#define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
343unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
344                    unsigned int avail);
345
346/* ib_sysctl.c */
347int __init rds_ib_sysctl_init(void);
348void rds_ib_sysctl_exit(void);
349extern unsigned long rds_ib_sysctl_max_send_wr;
350extern unsigned long rds_ib_sysctl_max_recv_wr;
351extern unsigned long rds_ib_sysctl_max_unsig_wrs;
352extern unsigned long rds_ib_sysctl_max_unsig_bytes;
353extern unsigned long rds_ib_sysctl_max_recv_allocation;
354extern unsigned int rds_ib_sysctl_flow_control;
355extern ctl_table rds_ib_sysctl_table[];
356
357/*
358 * Helper functions for getting/setting the header and data SGEs in
359 * RDS packets (not RDMA)
360 *
361 * From version 3.1 onwards, header is in front of data in the sge.
362 */
363static inline struct ib_sge *
364rds_ib_header_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
365{
366    if (ic->conn->c_version > RDS_PROTOCOL_3_0)
367        return &sge[0];
368    else
369        return &sge[1];
370}
371
372static inline struct ib_sge *
373rds_ib_data_sge(struct rds_ib_connection *ic, struct ib_sge *sge)
374{
375    if (ic->conn->c_version > RDS_PROTOCOL_3_0)
376        return &sge[1];
377    else
378        return &sge[0];
379}
380
381#endif
382

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